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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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Force Analysis and Reliability Improvement Method for the Conical Picks of the coal mining Machine Drum 14th

Force Analysis and Reliability Improvement Method for the Co...

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14th International Workshop of Advanced Manufacturing and Automation, IWAMA 2024

作者： Wang, Shuxue Xu, Weipeng College of Mechanical and Electronic Engineering Shandong University of Science and Technology Qingdao266590 China State Key Laboratory of Intelligent Coal Mining and Strata Control Shanghai China

ISBN: (纸本)9789819626243

In response to the situation where the first blade pick of a coal mining machine is prone to failure when cutting hard coal, the working process of the drum was simulated using finite element method. The force on the pick at different positions was obtained, and the main reasons for the failure of the first blade pick were analyzed. The effectiveness and practicality of reducing the force on the first blade pick were proposed and simulated. The research results indicate that the force on the first blade tooth can be effectively reduced by increasing the diameter of the end disk. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： coal mines

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Research on Meshing Characteristics and Vibration of Aluminum Miner Based on MASTA 14th

Research on Meshing Characteristics and Vibration of Aluminu...

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14th International Workshop of Advanced Manufacturing and Automation, IWAMA 2024

作者： Dong, Guanzhan Xu, Weipeng Gao, Kuidong College of Mechanical and Electronic Engineering Shandong University of Science and Technology Qingdao266590 China State Key Laboratory of Intelligent Coal Mining and Strata Control Shanghai China

ISBN: (纸本)9789819626243

Aiming at the mechanical continuous operation of bauxite mining process, firstly, an improved scheme of cutting bauxite with an 8-pole motor shearer is proposed, which is practical and feasible, and a 3D model is established in Solid Edge. Secondly, considering the higher meshing frequency of high-speed gear in the cutting part, the meshing characteristics under different loads were investigated by MASTA software, and the laws of contact stress, meshing dislocation and trans-mission error were obtained. Finally, the vibration displacement of one axis is obtained in view of the significant influence of individual order energy on the vibration of the shell under rated working conditions. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Bauxite deposits

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Research on the Characteristics of Multi-Outlet Internal Rotary Nozzle 14th

Research on the Characteristics of Multi-Outlet Internal Rot...

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14th International Workshop of Advanced Manufacturing and Automation, IWAMA 2024

作者： Jiang, Wenbo Xu, Weipeng College of Mechanical and Electronic Engineering Shandong University of Science and Technology Qingdao266590 China State Key Laboratory of Intelligent Coal Mining and Strata Control Shanghai China

ISBN: (纸本)9789819626243

This paper proposes a multi-outlet internal rotating nozzle structure to address the issues of soot generation and friction/wear associated with mineral mining. The atomization and jet characteristics of the nozzle are simulated and analysed using CFD software, and the effects of initial pressure and outlet diameter on the jet effect of the internal rotating nozzle are investigated. The findings indicate that the jet velocity in the lateral exit channel and the canter exit of the multi-outlet nozzle increases with an increase in the initial pressure. Conversely, the exit flow velocity of the nozzle at a constant initial pressure shows a gradual decrease with an increase in the exit diameter. At low pressure and outlet diameter, the atomization effect of the nozzle is not significant. However, the atomization angle increases gradually with an increase in the initial pressure and outlet diameter. Under the same pressure, the atomization angle shows a tendency of increasing and then decreasing with the increase of outlet diameter. And the best atomization angle is obtained when the outlet diameter is 1.3 mm and the initial pressure is 0.7 MPa. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2025.

关键词： Nozzles

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intelligent equalizing pressure ventilation system for coal mine: A case study of the 104 coal mining face in Shige Tai Mine

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Energy Reports 2025年 13卷 4998-5005页

作者： Geng, Feng Li, Wei Liu, Yanqing Peng, Ran Li, Zongxiang Liu, Hanwu Intelligent Control Technology Co. Ltd. Beijing100013 China Mine Intelligent Ventilation Division China Coal Research Institute Beijing100013 China Beijing Engineering and Research Center of Mine Safe Beijing100013 China National Key Laboratory of Intelligent Coal Mining and Rock Strata Control Beijing100013 China Safety Science and Engineering College Liaoning Technical University Liaoning 123000 China Beijing100083 China

This study investigates the application of an intelligent equalizing pressure ventilation system in the 104 coal mining face of the Shige Tai Mine. The relationship between the balanced pressure window opening area and the face air volume, as well as the equalizing pressure, was analyzed. A formula for calculating the local resistance of the balanced pressure window was derived. The combined regulation of the equalizing pressure local fan and the balanced pressure window was used to develop an intelligent equalizing pressure ventilation system, which can remotely and intelligently regulate the equalizing pressure of the mining face. The results show that the local wind resistance of the balanced pressure window is negatively exponentially related to its ventilation area, and the ventilation resistance of the working face is positively correlated with the air supply volume. After the combined equalizing pressure regulation, the volume fractions of CO2 and CO were significantly reduced, meeting the required air volume of the working face and achieving the expected effect of equalizing pressure ventilation. This study provides theoretical references for the intelligent equalizing pressure ventilation in coal mine mining faces. © 2025 The Authors

关键词： coal mines

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Theory of coal wall spalling and cooperative control by "support-destressing" in 10 m ultra-large mining height working face

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Meitan Xuebao/Journal of the China coal Society 2025年第4期50卷 1965-1978页

作者： Liu, Jiangbin Huang, Zhizeng Liu, Qianjin Zhang, Zhen Han, Cundi Lin, Xingyu Ma, Rongshan Zhao, Zhen Coal Mining and Designing Branch China Coal Research Institute Beijing100013 China Shaanxi Coal Caojiatan Mining Co. Ltd. Yulin719001 China CCTEG Coal Mining Research Institute Beijing100013 China Coal Mining and Designing Department Tiandi Science and Technology Co. Ltd. Beijing100013 China State Key Laboratory of Intelligent Coal Mining and Strata Control Beijing100013 China

coal wall spalling is one of the main factors restricting the safe production of 10 m ultra-large mining height working *** response to the problem of unclear mechanism of coal wall spalling and difficult control of surrounding rock in the 10 m ultra-large mining height working face, The characteristics of coal wall spalling in ultra-high mining height working faces were measured. The influence law and mechanism of horizontal stress unloading on the failure and instability of ultra-high coal walls in brittle coal bodies were studied, and the principle of cooperative control by "support-destressing" in ultra-large mining height working face was proposed. The research results indicate that the coal wall spalling of the 10m ultra high mining face is mainly in the form of a "half moon" shape and a "sloping step" shape, and the periodic pressure of the mining face exacerbates the instability of the coal wall spalling. coal wall spalling is the result of mining stress. The plastic damage of coal in front of coal wall mainly occurs in the post-peak unloading stage of advance abutment *** this stage, the horizontal stress and lateral pressure coefficient exhibit a gradient attenuation change. Because the middle part of the coal wall experiences weaker clamping action from the roof and floor, resulting in the greatest attenuation of horizontal stress. As the mining height increases, the degree of horizontal stress unloading in front of the coal wall significantly increases. The reduction in confining pressure caused by horizontal stress unloading is the primary controlling factor for the failure and instability of ultra-high coal walls in brittle fractured coal and rock masses, The reduction in confining pressure caused by horizontal stress unloading is the primary controlling factor for the failure and instability of ultra-high coal walls in brittle fractured coal and rock masses. The failure of coal wall preferentially develops in the direction of the maximum h

关键词： Brittle fracture

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The overburden destruction structure model and mechanism of mine pressure in Caojiatan coal mine with 10 m super large mining height

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Meitan Xuebao/Journal of the China coal Society 2025年第4期50卷 1951-1964页

作者： Zhang, Zhen Huang, Zhizeng Liu, Xiaogang Ren, Jianchao Liu, Qianjin Lin, Xingyu Xue, Jisheng Ma, Rongshan China Coal Technology and Industry Group Co. Ltd Beijing100013 China State Key Laboratory of Intelligent Coal Mining and Strata Control Beijing100013 China Coal Mining and Designing Department Tiandi Science and Technology Co. Ltd Beijing100013 China Shaanxi Shanmei Caojiatan Mining Co. Ltd. Yulin719001 China

The successful mining of 10 m ultra-high working face in Caojiatan coal mine marks a new level of full height mining technology in China's extra-thick coal seam. Based on the pressure, displacement and energy sensors, the mining of ultra-high mining face is monitored comprehensively, the characteristics of mine pressure behavior were clarified, the law of migration and fracture of overlying strata were obtained,the overburden structure model of ultra-high space mining under multi-layer thick and hard roof was established, and the mechanism of mine pressure action was clarified. The results show that: 10 m ultra-high mining height mining overburden has a large space of breaking, strong mine pressure, and features of "large compression step interval, obvious dynamic load, large shrinkage under support, and high safety valve opening rate". The periodic pressure step is mainly 10～25 m, with an average of 17.8 m, an increase of 5.2%～21% compared with the same wing full-mechanized caving mining. The maximum dynamic load coefficient of periodic pressure is 1.44～1.68, with an average of 1.60, and the proportion above 1.6 is 63%, which increases by 60% compared with the same wing full-mechanized caving mining. The maximum reduction of the support is concentrated in the range of 0.4～1.0 m, with an average of 0.63 m. The opening rate of the hydraulic support safety is 10.6%～78.9%, and the opening rate of the safety valve is more than 50% during the pressure period is 48.1%. The pressure region of the working face is obvious, which is concentrated in the range of 75 ～ 250 m from the head,with the characteristics of "large and small period to pressure, and multiple continuous large periodic weighting ". The interval of large periodic weighting is 102～186.8 m, with an average of 137.5 m. The microseismic events are distributed along the strike direction in the range of 300 m before and after the working face. During the large period to pressure, the micro-seismic high-energy even

关键词： Mine safety

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Elastic wave propagation and attenuation characteristics of roof fracture source

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Geomechanics and Engineering 2025年第4期40卷 295-305页

作者： Zhang, Peng-Fei Zhao, Tong-Bin Gong, Xu-Fei Tan, Yan Guo, Chuan-Qing College of Energy and Mining Engineering Shandong University of Science and Technology Qingdao266590 China State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of Science and Technology Shandong University of Science and Technology Qingdao266590 China Shandong Key Laboratory of Intelligent Prevention and Control of Dynamic Disaster in Deep Mines Shandong University of Science and Technology Qingdao266590 China Energy Group Co. Ltd. Jining No.2 Coal Mine Jining272012 China

Abstract. The propagation attenuation law of elastic waves generated by rock mass fractures in strata is of great significance in explaining engineering problems, such as rock bursts. In this study, a wave velocity model was established based on the actual stratum conditions of the Jining No.2 coal mine in China. The propagation process of different types of elastic waves is simulated using the elastic wave equation and finite difference method. The attenuation coefficients of various elastic wave parameters propagating at different positions were calculated. Based on the calculated results, an attenuation equation for the elastic wave energy is proposed. The results show that the propagation of S-waves and P-waves in strata is similar to each other, and wave pattern transformation occurs at the interface of the strata. The magmatic rocks played a role in channeling and reflecting elastic wave propagation, leading to the occurrence of low-energy aftershocks in the coal seams. The peak displacement, peak stress, and energy density of the elastic wave that propagated to the coal seam after the siltstone layer fracture of the roof of the 3down coal seam decreased to 28%, 25%, and 9% of the source, respectively. The attenuation of elastic wave energy is highly correlated with the propagation distance, and the attenuation equation can be represented as an exponential function. These results are of great significance for revealing the propagation attenuation process of elastic waves in the stratum. © 2025 Techno-Press, Ltd.

关键词： Exponential functions

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key technology and equipment for fully mechanized mining with extra-large shearing height of 10 m in extra-thick coal seam

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Meitan Xuebao/Journal of the China coal Society 2025年第4期50卷 1849-1875页

作者： Kang, Hongpu Lei, Yajun Zhao, Futang Xu, Gang Li, Zenglin Li, Mingzhong Wang, Rui Huang, Zhizeng Liu, Jiangbin Ma, Ying Han, Cundi Feng, Yanjun Zhang, Zhen Zhang, Jinhu Ren, Jianchao Song, Yejie Zeng, Mingsheng Cheng, Lixing CCTEG Coal Mining Research Institude Beijing100013 China State Key Laboratory of Intelligent Coal Mining and Strata Control Beijing100013 China Beijing Tianma Intelligent Control Technology Co. Ltd. Beijing101399 China Caojiatan Mining Co. Ltd. Shaanxi Coal and Chemical Industry Group Co. Ltd. Yulin719000 China Shaanxi Coal and Chemieal Industry Group Co. Ltd. Xi’an710065 China

Fully mechanized mining technology with extra-large shearing height is the optimal technical approach to achieve high-yield, high-efficiency and high-recovery mining for 6-10 m ultra-thick coal seam in Chinese coal mines. Based on the analysis of the current status of fully mechanized mining technology and equipment with extra-large shearing height at home, focusing on the geological condition of fully mechanized working face with ultra-large shearing height of 10 m in extra-thick coal seam in the Caojiatan coal Mine, Shaanxi coal and Chemical Industry Group Co., Ltd., the existing technical problems were analyzed and the associated solutions were given from three aspects: surrounding rock control, key mining equipment and intelligent collaborative control. After nearly five years of scientific research, a series of innovative achievements have been achieved: ① The surrounding rock control strategy with coordination of support and destressing for ultra-large shearing height working faces, namely "active strong support and protection + regional hydraulic fracturing weakening and stress relief", was proposed, a complete set of underground hydraulic fracturing technology and equipment with large flow of 5 m3/min was developed. Effective prevention and control of strong mining-induced activities in ultra-large shearing height working face has been realized. ② The strong hydraulic shields with ultra-large shearing height of 10 m were developed, and the "double-layer telescopic beam + three-level side guard" mechanism was innovatively designed to achieve safe protection of working face roof and ultra-high coal wall;the zoned lubrication and distributed cooling scheme improves the cutting reliability of the shearer with large angle of elevation and long rocker;the high-reliability middle trough, lower chain catenary and slow-changing power start-up improve the adaptability of the ultra-large capacity scraper conveyor to the coal flow transportation of the working face with

关键词： mining drills

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Surrounding rock control technology of 10 m super large mining height working face in Caojiatan coal Mine

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Meitan Xuebao/Journal of the China coal Society 2025年第4期50卷 1935-1950页

作者： Wang, Rui Xu, Gang Kang, Hongpu Zhang, Zhen Lei, Yajun Feng, Yanjun Ma, Ying Huang, Zhizeng Liu, Qianjin Liu, Xiaogang Lin, Xingyu Ma, Rongshan Zhao, Zhen Li, Zhengjie Shaanxi Shanmei Caojiatan Mining Co. Ltd. Yulin719001 China Coal Mining and Designing Department Tiandi Science and Technology Co. Ltd. Beijing100013 China China Coal Technology and Industry Group Co. Ltd. Beijing100013 China State Key Laboratory of Intelligent Coal Mining and Strata Control Beijing100013 China

The 10 m ultra-large mining height of Caojiatan coal Mine is a world's first in terms of single mining height and mining intensity, and the effective control of surrounding rock in the stope is crucial for safe and efficient mining at the working face. Based on the analysis of the coal seam occurrence conditions and the characteristics of the ground pressure behavior of the already mined faces, and considering the ultra-large mining space and the ultra-high coal wall characteristics of the working face, the difficulties in controlling the surrounding rock of ultra-large mining height were clarified. A "superimposed arch-beam" structural model for the ultra-large mining height stope was established, and a three-in-one surrounding rock control strategy of "active support protection + regional pressure relief weakening + comprehensive monitoring and early warning" was proposed, verifying the effectiveness of the surrounding rock control for the 10 m ultra-large mining height. The research shows that: the occurrence characteristics of multi-layer thick and hard roofs cause abnormally strong mine pressure manifestation at the working face, with large-area hanging roofs during initial mining and significant strong dynamic loading pressure at the working face during normal mining. The keys to controlling the surrounding rock in the 10 m ultra-large mining height stope are reducing the pressure step distance, weakening the dynamic loading pressure, preventing rib spalling, and preventing the working face from being crushed by the pressure. The "double-layer telescopic beams + three-stage rib protection" structure of the hydraulic support achieves independent operation for the protection of the empty roof in front of the support and the ultra-high coal wall, solving the problem of incomplete rib protection by the original split-type rib protection. The high initial setting force and high working resistance of the hydraulic support significantly reduce the risk of rib spallin

关键词： Disaster prevention

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