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Effects of aggregate size distribution and carbon nanotubes on the mechanical properties of cemented gangue backfill samples under true triaxial compression

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 311-324页

作者： Qian Yin Fan Wen Zhigang Tao Hai Pu Tianci Deng Yaoyao Meng Qingbin Meng Hongwen Jing Bo Meng Jiangyu Wu State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Mining Response and Disaster Prevention and Control in Deep Coal Mines Anhui University of Science and TechnologyHuainan 232001China State Key Laboratory for Geomechanics&Deep Underground Engineering China University of Mining and Technology(Beijing)Beijing 100083China Key Laboratory of Xinjiang Coal Resources Green Mining Ministry of EducationXinjiang Institute of EngineeringUrumqi 830023China

The mechanical behavior of cemented gangue backfill materials(CGBMs)is closely related to particle size distribution(PSD)of aggregates and properties of cementitious ***,the true triaxial compression tests,CT scanning,SEM,and EDS tests were conducted on cemented gangue backfill samples(CGBSs)with various carbon nanotube concentrations(P_(CNT))that satisfied fractal theory for the PSD of *** mechanical properties,energy dissipations,and failure mechanisms of the CGBSs under true triaxial compression were systematically *** results indicate that appropriate carbon nanotubes(CNTs)effectively enhance the mechanical properties and energy dissipations of CGBSs through micropore filling and microcrack bridging,and the optimal effect appears at P_(CNT)of 0.08wt%.Taking PSD fractal dimension(D)of 2.500 as an example,compared to that of CGBS without CNT,the peak strength(σ_(p)),axial peak strain(ε_(1,p)),elastic strain energy(Ue),and dissipated energy(U_(d))increased by 12.76%,29.60%,19.05%,and90.39%,***,excessive CNTs can reduce the mechanical properties of CGBSs due to CNT agglomeration,manifesting a decrease inρ_(p),ε_(1,p),and the volumetric strain increment(Δε_(v))when P_(CNT)increases from 0.08wt%to 0.12wt%.Moreover,the addition of CNTs improved the integrity of CGBS after macroscopic failure,and crack extension in CGBSs appeared in two modes:detour and pass through the ***σ_(p)and U_(d)firstly increase and then decrease with increasing D,and porosity shows the opposite ***ε_(1,p)andΔε_(v)are negatively correlated with D,and CGBS with D=2.150 has the maximum deformation parameters(ε_(1,p)=0.05079,Δε_(v)=0.01990)due to the frictional slip effect caused by coarse *** increasing D,the failure modes of CGBSs are sequentially manifested as oblique shear failure,"Y-shaped"shear failure,and conjugate shear failure.

关键词： cemented gangue backfill materials particle size distribution true triaxial compression test carbon nanotubes mechanical properties failure modes

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Effect of lateral stress on frictional properties of a fracture in sandstone

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Journal of Rock Mechanics and Geotechnical engineering 2024年第11期16卷 4416-4427页

作者： Zhechao Wang Jinmeng Zhao Derek Elsworth Xia-Ting Feng Pengyu Wang Institute of Deep Engineering and Intelligent Technology Northeastern UniversityShenyang110819China Liaoning Provincial Research Center on Underground Storage Engineering Shenyang110819China Energy and Mineral Engineering EMS Energy Institute and G3 CenterPennsylvania State UniversityUniversity Park16802USA

The injection of large volumes of natural gas into geological formations,as is required for underground gas storage,leads to alterations in the effective stress exerted on adjacent *** increases the potential for their reactivation and subsequent earthquake *** measurements of the frictional properties of rock fractures have been conducted under normal and shear ***,faults in gas storage facilities exist within a true three-dimensional(3D)stress state.A double-direct shear experiment on rock fractures under both lateral and normal stresses was conducted using a true triaxial loading *** was observed that the friction coefficient increases with increasing lateral stress,but decreases with increasing normal *** impact of lateral and normal stresses on the response is primarily mediated through their influence on the initial friction *** allows for an empirical modification of the rate-state friction model that considers the influence of lateral and normal *** impact of lateral and normal stresses on observed friction coefficients is related to the propensity for the production of wear products on the fracture *** stresses enhance the shear strength of rock(*** criterion).This reduces asperity breakage and the generation of wear products,and consequently augments the friction coefficient of the ***,increased normal stresses inhibit dilatancy on the fracture surface,increasing the breakage of asperities and the concomitant production of wear products that promote rolling *** ultimately reduces the friction coefficient.

关键词： Sandstone fracture Friction coefficient Lateral stress Normal stress Shear rate Rate-state friction model

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Implications for fault reactivation and seismicity induced by hydraulic fracturing

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Petroleum Science 2024年第2期21卷 1081-1098页

作者： Zi-Han Sun Ming-Guang Che Li-Hong Zhu Shu-Juan Zhang Ji-Yuan Lu Chang-Yu Jin Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines School of Resources and Civil Engineering and Key Laboratory of Liaoning Province on Deep Engineering and Intelligent TechnologyNortheastern UniversityShenyang110819LiaoningChina Research Institute of Petroleum Exploration&Development PetroChina Company LimitedBeijing100084China The Exploration and Development Research Institute of Daqing Oilfield Limited Company Daqing163458HeilongjiangChina

Evaluating the physical mechanisms that link hydraulic fracturing(HF) operations to induced earthquakes and the anticipated form of the resulting events is significant in informing subsurface fluid injection operations. Current understanding supports the overriding role of the effective stress magnitude in triggering earthquakes, while the impact of change rate of effective stress has not been systematically addressed. In this work, a modified critical stiffness was brought up to investigate the likelihood, impact,and mitigation of induced seismicity during and after hydraulic fracturing by developing a poroelastic model based on rate-and-state fraction law and linear stability analysis. In the new criterion, the change rate of effective stress was considered a key variable to explore the evolution of this criterion and hence the likelihood of instability slip of fault. A coupled fluid flow-deformation model was used to represent the entire hydraulic fracturing process in COMSOL Multiphysics. The possibility of triggering an earthquake throughout the entire hydraulic fracturing process, from fracturing to cessation, was investigated considering different fault locations, orientations, and positions along the fault. The competition between the effects of the magnitude and change rate of effective stress was notable at each fracturing stage. The effective stress magnitude is a significant controlling factor during fracturing events, with the change rate dominating when fracturing is suddenly started or stopped. Instability dominates when the magnitude of the effective stress increases(constant injection at each fracturing stage) and the change rate of effective stress decreases(the injection process is suddenly stopped). Fracturing with a high injection rate, a fault adjacent to the hydraulic fracturing location and the position of the junction between the reservoir and fault are important to reduce the Coulomb failure stress(CFS) and enhance the critical stiffness as

关键词： Hydraulic fracturing Coulomb failure stress Rate-and-state fraction model Linear stability analysis Critical stiffness Seismically induced fault

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Rock cracking simulation in tension and compression by peridynamics using a novel contact-friction model with a twin mesh and potential functions

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Journal of Rock Mechanics and Geotechnical engineering 2025年第6期17卷 3395-3419页

作者： Tian, Feng Liu, Zaobao Zhou, Jinxin Shao, Jianfu Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines College of Resources and Civil Engineering Northeastern University Shenyang 110819 China Key Laboratory of Deep Engineering and Intelligent Technology Institute of Deep Engineering and Intelligent Technology Northeastern University Shenyang 110819 China University Lille CNRS Centrale Lille UMR 9013-LaMcube–Laboratoire de Mécanique Multiphysique Multi-échelle Lille 59000 France

Peridynamics (PD) is an effective method for simulating the spontaneous initiation and propagation of tensile cracks in materials. However, it faces great challenges in simulating compression-shear cracking of geomaterials due to the lack of efficient contact-friction models. This paper introduces an original contact-friction model that leverages twin mesh and potential function principles within PD to model rock cracking under tensile and compressive stresses. The contact detection algorithm, based on space segmentation axis-aligned bounding box (AABB) tree data structure, is used to address the significant challenge of highly efficient contact detection in compression and shear problems. In this method, the twin mesh and potential function are utilized to quantify contact detection and contact degree, as well as friction behavior. This is in contrast to the distance and circular contact area model, which lacks physical significance in the classical PD method. As demonstrated by the tests on specimens containing cracks, the proposed model can capture 8 types of secondary fractures, reduce the contact detection error by about 29%–56%, and increase the contact retrieval efficiency by over 1600 times compared to the classic PD models. This significantly enhances the capability of PD to simulate the initiation, expansion, and coalescence of intricate compression-shear cracks. © 2025 institute of Rock and Soil Mechanics, Chinese Academy of Sciences

关键词： Compression-shear modeling Contact detection algorithm Contact-friction model Cracking modeling of geomaterials Peridynamics (PD) Rock cracking modeling

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Composition and Application of Acoustic Detection System for Human Occupied Vehicle Research Vessel 6

Composition and Application of Acoustic Detection System for...

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6th International Conference on Electronic engineering and Informatics, EEI 2024

作者： Wang, Xiangxin Zhang, Tongwei Zhao, Shengya Liu, Yixu Li, Dewei Li, Baogang College of Intelligent Systems Science and Engineering Harbin Engineering University Harbin China Nation Deep Sea Center Deep Sea Technology Department Qingdao China Institute of Marine Science and Technology Shandong University Qingdao China

ISBN: (纸本)9798350353594

A human occupied vehicle (HOV) research vessel, as a modern specialized research vessel, should provide comprehensive support for the deep-diving operations of the HOV and perform ocean scientific research tasks. Its acoustic system includes a deep-water multi-beam sounding system, a medium and shallow water multi-beam sounding system, a deep-water single-beam sounding system, a deep-water shallow formation profile detection system, a deep-sea ultra short baseline positioning system, a shipborne acoustic doppler current profiler, an underwater acoustic communication system, and an auxiliary sensor system. This paper introduces the acoustic system of the HOV research vessel, discussing its basic functions and system composition. It also presents typical application methods and detection data during marine scientific investigations. Practical results show that the rational use of the HOV research vessel's acoustic detection system significantly improves the efficiency of underwater detection and facilitates the quick deployment and recovery of submersible instruments. © 2024 IEEE.

关键词： Underwater acoustic communication

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Development of a pressure coring system for the investigation of deep underground exploration

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International Journal of Mining Science and technology 2023年第11期33卷 1351-1364页

作者： Da Guo Ling Chen Zhongya Zhou Dingming Wang Yiwei Zhang Xun Yang Xin Fang Xiaojun Wang Heping Lu Lin Dai Heping Xie State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Sichuan UniversityChengdu 610065China School of Mechanical Engineering Sichuan UniversityChengdu 610065China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Petroleum Engineering Technology Research Institute of Sinopec Jianghan Oilfield Company Wuhan 430035China

To provide a more accurate evaluation of the scale of deep underground resources,a new pressure coring system was carefully developed and its strength and safety of the engineering were verified by theoretical analyses and numerical *** designed pressure coring system can obtain cores with length of 3 m and diameter of 50 mm at 70 *** results of the ball-drop operation experiment demonstrate that differential motion assembly can effectively cut a safety pin by applying a tensile force of 4852 N,and it can lift the core tube through the center pole to complete a series of mechanical actions to seal the ***,by maintaining pressures at 70 MPa for 30 min,the pressure sealing capacity of the system was ***,a core sample with a diameter of 50 mm was obtained through a core drilling experiment and the coring performance of the pressure coring system was *** study can not only enrich the existing onshore coring technology but also provide a theoretical guide and design criteria for the development of similar pressure coring systems to meet the demand for deeper underground exploration.

关键词： Underground exploration In-situ coring Pressure coring Oil and gas production

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Borehole reinforcement based on polymer materials induced by liquid-gas phase transition in simulating lunar coring

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International Journal of Mining Science and technology 2025年第3期35卷 383-398页

作者： Dingqiang Mo Tao Liu Zhiyu Zhao Liangyu Zhu Dongsheng Yang Yifan Wu Cheng Lan Wenchuan Jiang Heping Xie State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing UniversityChongqing 400044China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization College of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610065China State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering Sichuan UniversityChengdu 610065China College of Polymer Science and Engineering Sichuan UniversityChengdu 610065China Shenzhen Key Laboratory of Deep Engineering Science and Green Energy Institute of Deep Earth Sciences and Green EnergyShenzhen UniversityShenzhen 518060China

Lunar core samples are the key materials for accurately assessing and developing lunar ***,the difficulty of maintaining borehole stability in the lunar coring process limits the depth of lunar ***,a strategy of using a reinforcement fluid that undergoes a phase transition spontaneously in a vacuum environment to reinforce the borehole is *** on this strategy,a reinforcement liquid suitable for a wide temperature range and a high vacuum environment was developed.A feasibility study on reinforcing the borehole with the reinforcement liquid was carried out,and it is found that the cohesion of the simulated lunar soil can be increased from 2 to 800 kPa after using the reinforcement ***,a series of coring experiments are conducted using a selfdeveloped high vacuum(vacuum degree of 5 Pa)and low-temperature(between-30 and 50℃)simulation *** is confirmed that the high-boiling-point reinforcement liquid pre-placed in the drill pipe can be released spontaneously during the drilling process and finally complete the reinforcement of the *** reinforcement effect of the borehole is better when the solute concentration is between0.15 and 0.25 g/mL.

关键词： Lunar coring Reinforcement fluid Borehole reinforcement Drill bit cooling

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Research progress and application of deep in-situ condition preserved coring and testing

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International Journal of Mining Science and technology 2023年第11期33卷 1319-1337页

作者： Heping Xie Yunqi Hu Mingzhong Gao Ling Chen Ru Zhang Tao Liu Feng Gao Hongwei Zhou Xiaobo Peng Xiongjun Li Jianbo Zhu Cunbao Li Ruidong Peng Yanan Gao Cong Li Jianan Li Zhiqiang He State Key Laboratory of Intelligent Construction and Healthy Operation and Maintenance of Deep Underground Engineering College of Water Resource and HydropowerSichuan UniversityChengdu 610065China State Key Laboratory of Intelligent Construction and Health Operation and Maintenance of Deep Earth Engineering Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and UtilizationInstitute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen 518060China School of Mechanical Engineering Sichuan UniversityChengdu 610065China Institute of New Energy and Low-Carbon Technology Sichuan UniversityChengdu 610065China Frontier Science Research Center for Fluidized Mining of Deep Underground Resources China University of Mining and TechnologyXuzhou 221116China State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology-BeijingBeijing 100083China

With the depletion of shallow resources,the exploration of deep earth resources has become a global *** study of the different patterns in the physical mechanical properties of rocks at different occurrence depths is the basis for exploring deep into the earth,with the core and premise being the acquisition and testing of deep in-situ core *** on the original idea of deep in-situ condition preserved coring(ICP-Coring)and testing,combined with theoretical modeling,numerical analysis,test platform development,indoor testing and engineering application,the principles and technologies of deep ICP-Coring are *** principle and technology consists of five parts:in-situ pressurepreserved coring(IPP-Coring),in-situ substance-preserved coring(ISP-Coring),in-situ temperaturepreserved coring(ITP-Coring),in-situ light-preserved coring(ILP-Coring),and in-situ moisturepreserved coring(IMP-Coring).The theory and technology of temperature and pressure reconstruction at different occurrence depths and in different environments are proposed,and prototype trial production was completed by following the principle of displacement and tests based on the in-situ reconstructed *** notable advances are as follows:(1)deep in-situ coring system:A pressure-preserved controller with an ultimate bearing capacity greater than 140 MPa,highperformance(temperature-resistant,pressure-resistant,and low thermally conductive)temperaturepreserved materials,an active temperature control system,and high-barrier quality-preserved membrane materials were developed;a deep ICP-Coring capacity calibration platform was independently developed,a deep in-situ coring technology system was developed,and the acquisition of deep in-situ cores was realized.(2)In-situ storage displacement system:Following the dual-circuit hydraulic design idea,a single-drive source push-pull composite grabbing mechanism was designed;the design of the overall structure for the deep in-situ displ

关键词： deep mining deep in-situ Coring Displacement Test

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Anisotropic strength,deformation and failure of gneiss granite under high stress and temperature coupled true triaxial compression

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岩石力学与岩土工程学报（英文版） 2024年第3期16卷 860-876页

作者： Hongyuan Zhou Zaobao Liu Fengjiao Liu Jianfu Shao Guoliang Li Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines College of Resources and Civil EngineeringNortheastern UniversityShenyang110819China Institute of Deep Engineering and Intelligent Technology Northeastern UniversityShenyang110819China University Lille CNRSCentrale LilleUMR 9013-LaMcube-Laboratoire de MécaniqueMultiphysiqueMulti-échelleF-59000LilleFrance Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines College of Resources and Civil EngineeringNortheastern UniversityShenyang110819China Institute of Deep Engineering and Intelligent Technology Northeastern UniversityShenyang110819China Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines College of Resources and Civil EngineeringNortheastern UniversityShenyang110819China University Lille CNRSCentrale LilleUMR 9013-LaMcube-Laboratoire de MécaniqueMultiphysiqueMulti-échelleF-59000LilleFrance State Key Lab on Rail & Transit Engineering Informatization China Railway First Survey and Design Institute Group Co.LtdXi'an710043China

The anisotropic mechanical behavior of rocks under high-stress and high-temperature coupled condi-tions is crucial for analyzing the stability of surrounding rocks in deep underground *** paper is devoted to studying the anisotropic strength,deformation and failure behavior of gneiss granite from the deep boreholes of a railway tunnel that suffers from high tectonic stress and ground temper-ature in the eastern tectonic knot in the Tibet ***-temperature true triaxial compression tests are performed on the samples using a self-developed testing device with five different loading directions and three temperature values that are representative of the geological conditions of the deep under-ground tunnels in the *** of temperature and loading direction on the strength,elastic modulus,Poisson's ratio,and failure mode are *** method for quantitative identification of anisotropic failure is also *** anisotropic mechanical behaviors of the gneiss granite are very sensitive to the changes in loading direction and temperature under true triaxial compression,and the high temperature seems to weaken the inherent anisotropy and stress-induced deformation *** strength and deformation show obvious thermal degradation at 200℃ due to the weakening of friction between failure surfaces and the transition of the failure pattern in rock *** the range of 25 ℃-200 ℃,the failure is mainly governed by the loading direction due to the inherent *** study is helpful to the in-depth understanding of the thermal-mechanical behavior of anisotropic rocks in deep underground projects.

关键词： Anisotropic strength and deformation True triaxial compression Thermal mechanical coupling deep rock mechanics High temperature rock mechanics

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Integrated approach of predicting rock stability in high mountain valley underground caverns

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Underground Space 2024年第6期19卷 317-341页

作者： Fuyuan Tan Haosen Guo Pengzhi Pan Zhaofeng Wang Xufeng Liu Yangyi Zhou East China Jiaotong University Nanchang 467200China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil MechanicsChinese Academy of SciencesWuhan 430071China Key Laboratory of Liaoning Province on Deep Engineering and Intelligent Technology Northeastern UniversityShenyang 110819China University of Chinese Academy of Sciences Beijing 100049China

High mountain valleys are characterized by the development of intricate ground stress fields due to geological processes such as tectonic stress,river erosion,and rock *** processes introduce considerable stability concerns in the surrounding rock formations for underground engineering projects in these regions,highlighting the imperative need for rigorous stability assessments during the design phase to ensure construction *** paper introduces an innovative approach for the pre-evaluation of the stability of surrounding rocks in underground caverns situated within high mountain *** methodology comprises several pivotal ***,we conduct inverse calculations of the ground stress field in complex geological terrains,combining field monitoring and numerical ***,we ascertain stress-strength ratios of the surrounding rocks using various rock strength *** assess the stability characteristics of the surrounding rocks in the 1^(#)spillway cave within our project area,we employ numerical simulations to compute stress-strength ratios based on different rock strength ***,we undertake a comparative analysis,utilizing data from the 5^(#)Underground Laboratory(Lab 5)of Jinping II Hydropower Station,aligning the chosen rock strength criterion with the damage characteristics of Lab 50s surrounding *** analysis serves as the cornerstone for evaluating other mechanical responses of the surrounding rocks,thereby validating the pre-evaluation *** pre-evaluation method takes into account the intricate geological evolution processes specific to high mountain *** also considers the influence of the initial geostress field within the geological range of underground *** comprehensive approach provides a robust foundation for the analysis and assessment of the stability of surrounding rocks,especially in high mountain valley areas,during the design phase of underground engi

关键词： High mountain valley Underground cavern Stability of surrounding rock On-site monitoring Stress-strength ratio Numerical simulation

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