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arXiv 2025年

作者： Zhao, Rong Li, Chunguang Sinopec Key Laboratory of Ultra-Deep Well Drilling Engineering Technology Beijing102206 China SINOPEC Research Institute of Petroleum Engineering Co. Ltd Beijing102206 China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan430071 China

This study presents new elastic velocity-effective stress laws for reservoir rocks. These models are grounded in previously established correlations between elastic modulus and porosity, which incorporate critical porosity. The accuracy of the models is validated against wave velocities from 38 core samples, yielding coefficients of determination (R2) of 0.9994 for compressional wave and 0.9985 for shear wave. A sensitivity analysis reveals that the maximum uncertainties for compressional and shear waves are less than ±5.5% and ±7.5%, respectively. To demonstrate the applicability of the proposed models, a case study was conducted on three wells in the Northern Carnarvon Basin, where the new elastic wave velocity-effective stress laws produced reliable predictions for velocity logs in the studied formations. The relationships reported herein may prove beneficial for hydrocarbon exploration, production, and ensuring drilling safety in both unconventional and conventional fields. Copyright © 2025, The Authors. All rights reserved.

关键词： Shear waves

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Influence of real-time engineering temperature on mechanical behavior and failure mechanism of granite in a tunnel in Southwestern China

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Bulletin of engineering Geology and the Environment 2025年第6期84卷 1-19页

作者： Zhang, Yan Gao, Meiben Xu, Zhongyuan Ma, Chunchi Gao, Yaohui Key Laboratory of Landslide Risk Early-Warning and Control Ministry of Emergency Management Chengdu University of Technology Chengdu China State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Chengdu China Faculty of Geosciences and Environment Engineering Southwest Jiaotong University Chengdu China State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China Key Laboratory of Ministry of Education On Safe Mining of Deep Metal Mines Northeastern University Liaoning China

At present, there is relatively little attention paid to the rock mechanics properties within the engineering temperature range and under small temperature gradients. Combining uniaxial compression tests with particle flow code (PFC) simulations, this study investigates the temperature strengthening mechanism of granite within 20–80 °C. The research reveals a fundamental transition in failure patterns: macroscopic failure modes shift from shear-dominated to tensile-dominated mechanisms as temperature increases, accompanied by microstructural evolution showing smoother fracture surfaces and enhanced intergranular fracture characteristics. Notably, thermal expansion-induced negative strain promotes advantageous strain energy accumulation, which optimizes particle contact relationships and improves frictional properties within the granite matrix. These microstructural enhancements manifest as improved macroscopic mechanical performance, including increased elastic modulus and peak strength, demonstrating a distinctive negative thermal damage phenomenon where moderate heating strengthens rock integrity. A thermal–mechanical-damage statistical constitutive model is developed, with parameter evolution analysis providing mechanistic insights. The findings advance understanding of thermal effects in rock mechanics and offer practical implications for engineering rock mass stability assessment under thermal–mechanical coupling conditions.

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Floor heave controlling method for high-speed railway tunnels using a foamed concrete compressible layer

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Construction and Building Materials 2025年 479卷

作者： Tian, Hongming Cao, Haowen Chen, Weizhong Tan, Xianjun Chen, Minghao Jia, Zheqiang State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Science Hubei Wuhan430071 China University of Chinese Academy of Sciences Beijing100049 China China Railway Eryuan Engineering Group Co. LTD Sichuan Chengdu610031 China

Floor heave in railway tunnels, caused by the time-dependent behavior of soft rock, poses a significant threat to the safe operation of high-speed trains. Based on the yielding support principles, the compressible layer is a potential solution to address the time-dependent floor heave in railway tunnels. However, suitable materials for the compressible layer haven't been developed. In this study, an innovative foamed concrete-filled polyethylene pipe (FC-PEP) is proposed for use as the compressible layer. First, the high compression capability of FC-PEP and its response to long-term train load action were investigated by series of compression tests. The tests results revealed that the stress-strain curves of FC-PEP exhibited an evident stress plateau stage prior to densification, with a maximum compression strain reaching 0.50–0.54 during this stage, which can meet the high compression capability requirement of compression layer. Furthermore, when the density of FC-PEP ranges between 600 and 750 kg/m³, the long-term dynamic train load has little impact on its high compression capability, indicates its feasible for controlling floor heave. Finally, based on the monitoring data of floor heave in a railway tunnel, the performance of the FC-PEP layer was investigated through numerical simulations. The numerical results indicate that if a 20 cm thick FC-PEP compressible layer is constructed between the primary support and secondary lining, can reduce floor heave in the railway tunnel by 33.0 %, thereby demonstrating the feasibility of the FC-PEP layer as an effective solution. © 2025

关键词： Railroad tunnels

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Quantitative Analysis of the Spatial and Temporal Distribution Pattern of Net Primary Productivity of Vegetation in Hubei Province and Its Multiple Driving Forces

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Huanjing Kexue/Environmental Science 2025年第5期46卷 2997-3008页

作者： Zhou, Zhi-Gang Ding, Ye Wang, Min-Li Zhang, Hui-Cong Tian, Shi-Yu Huang, Fan Yan, Feng Changjiang Geotechnical Engineering Corporation Wuhan430010 China State Key Laboratory of Water Resources Engineering and Management Wuhan430010 China College of Land and Resources Hebei Agricultural University Baoding071000 China

The health and stability of vegetation ecosystems in Hubei Province are important to the ecological security of the entire Yangtze River Basin. The spatio-temporal succession pattern of vegetation net primary productivity（NPP）in Hubei Province was analyzed by using the Sen trend+MK test，based on the Google earth engine（GEE）platform to obtain the MOD17A3HGF.061 vegetation NPP dataset from 2002 to 2020. The coefficient of variation and the Hurst index were then employed to elucidate the multiple driving mechanisms of NPP spatio-temporal differentiation. This was achieved through the use of optimal parameters-based geographical detectors（OPGD），which were employed to clarify the multiple driving mechanisms of spatial and temporal variability of NPP. The results showed that：① Between 2002 and 2020，vegetation NPP in Hubei Province showed an increasing trend with a rate of 2.423 8 g·m-2·a-1，spatially higher in the west and lower in the east;vegetation NPP was dominated by low volatility（about 79% of the total），the trend of change was dominated by increase（about 89% of the total），and future change was dominated by weak inverse persistence（about 62% of the total）. ② The main factors affecting the change in vegetation NPP in Hubei Province were secondary GDP，tertiary GDP，the number of high-tech enterprises，and elevation（all q-values were greater than 0.5）;the two-factor interactions all showed either a two-factor enhancement or a nonlinear enhancement，whereas evapotranspiration ∩ secondary GDP had the highest explanatory power of 0.74. ③ Except for the indicators of type variables，such as slope direction，vegetation type，rock type，soil type，and land use type，most of the other factors showed significant differences in their effects on vegetation NPP in Hubei Province. Economic factors，such as first production GDP in the interval of（1.03 million yuan，1.16 million yuan），the mean value of NPP in Hubei Province was the largest at 733.886 7 g·m-2·a-1，and the NPP showed a decreasing

关键词： Inverse problems

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Numerical Simulation of Slope Deformation Induced by Rapid Drawdown: A Case Study

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geotechnical and Geological engineering 2025年第5期43卷 1-12页

作者： Cheng, Zhichao Liu, Shiqi Jin, Yang Yan, Long PowerChina Huadong Engineering Corporation Limited Hangzhou311122 China Research Institute of Geotechnical Engineering Hohai University No.1 Xikang Road Nanjing210098 China Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering Hohai University Nanjing210098 China Jinan250353 China

The rapid drawdown of reservoirs has an unloading effect and can cause slope deformation and failure. The paper investigates the impact of rapid water drawdown on the reservoir bank slopes, using a case study of the Dahua landslide around the reservoir area of the Dahuaqiao Hydropower Station for illustration. Furthermore, a numerical procedure based on the ABAQUS finite element code has been applied to model the coupled hydro-mechanical process. The analysis was undertaken by integration the shear strength reduction technique and transient unsaturated flow modeling. The numerical results show that the rapid water drawdown generates hydrodynamic pressure, which has a crucial impact on the movement behavior of landslides. Landslide deformation is triggered by the "fore-pulling" of rock mass at the slope toe caused by the water level change. Moreover, the calculated factor of safety decreases by about 10.83 percent as the water level drops at an average speed of 2.1 m/day. Based on the numerical simulation results and field monitoring data, the effectiveness of the numerical simulation has been discussed. The calculated values of the cumulative displacement at the three measuring points are 15.07, 9.08 mm and 5.25 mm, respectively. And the corresponding monitoring displacement values are 16.79 mm, 11.06 mm and 5.75 mm, confirming the numerical simulation’s reasonableness. In addition, this study can provide a case reference for preventing the recurrence of similar incidents. © The Author(s), under exclusive licence to Springer Nature Switzerland AG 2025.

关键词： Landslides

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Estimation of rock strength parameters from petrological contents using tree-based machine learning techniques

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AI in Civil engineering 2025年第1期4卷 1-28页

作者： Hussain, Javid Fu, Xiaodong Chen, Jian Ali, Nafees Iqbal, Sayed Muhammad Hussain, Wakeel Hussain, Altaf Saleem, Ahmed State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock and Soil Mechanics Chinese Academy of Sciences Wuhan China University of Chinese Academy of Sciences Beijing China China-Pakistan Joint Research Center On Earth Sciences Islamabad Pakistan Hubei Key Laboratory of Geo-Environmental Engineering Wuhan China School of Geophysics and Geomatics China University of Geosciences Wuhan China University of Engineering and Technology Lahore Pakistan

The demand for construction materials in Pakistan has experienced a significant increase, particularly due to the China-Pakistan Economic Corridor (CPEC) project, which necessitates substantial amounts of resilient resources for infrastructure development. Parameters of rock strength, including uniaxial compressive strength (UCS), Young’s modulus (E), and Poisson’s ratio (ν), are critical attributes of rock materials vital for applications such as rock slope stability assessment, tunnel construction, and foundation design. Conventionally, the measurement of UCS, E, and ν in laboratory settings resource-intensive, requiring considerable time and financial investment. This study proposes to provide a comprehensive assessment framework using an adaptive boosting machine (AdaBoost), extreme gradient boosting machine (XGBoost), and category gradient boosting machine (CatBoost), to indirectly estimate UCS, E, and ν through streamlined mineralogical analyses. The performance of the boosting trees was analyzed using Taylor diagrams and a suite of five regression metrics: coefficient of determination (R2), root mean square error (RMSE), mean absolute error (MAE), variance accounted for (VAF), and the A-20 index. The results indicate that the proposed boosting trees robust predictive capabilities for the constructed database. Notably, AdaBoost demonstrated the highest efficacy in predicting the strength of carbonate rock, achieving R2 values of 0.98, 0.99, and 0.97, with the lowest RMSE values of 0.3164, 0.63, and 0.18, for UCS, E, and ν, respectively. Moreover, variable importance analysis highlighted that the presence of micrite and calcite has a significant impact on predicting UCS, E, and ν of carbonate rock. Furthermore, the AdaBoost model was validated using an independent dataset, which corroborated its predictive reliability. In conclusion, the proposed models present a highly effective methodology for the indirect prediction of essential mechanical properties of

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Modelling the crystalline swelling process of montmorillonite incorporating boundary effects

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Computers and Geotechnics 2025年 184卷

作者： Dai, Wen-jie Chen, Yong-gui Li, Yu-cheng Ye, Wei-min Wang, Qiong Department of Geotechnical Engineering College of Civil Engineering Tongji University Shanghai200092 China State Key Laboratory of Disaster Reduction in Civil Engineering Tongji University Shanghai200092 China

Crystalline swelling behavior of montmorillonite (Mt) profoundly impacts the phenomenological properties of expansive clays. Accurately modeling the evolution of basal spacing is essential for assessing the performance of expansive clay materials in geotechnical applications, particularly in high-level radioactive waste (HLRW) repositories. This study aims to address the primary limitation of existing crystalline swelling models, which fail to account for boundary effects dependent on clay structure. A mass transfer boundary is integrated into the Laird model, and its validity is substantiated through basal spacing measurements of tactoids and bentonites. The mass transfer boundary is described using the soil water retention curve (SWRC) for bound water. Furthermore, net hydration energies are determined using an empirical function, eliminating the need for experimental calibration of effective diabattivity. The modified model is validated against experimental data for three common bentonites: GMZ, MX-80, and Kunipia. It demonstrates enhanced predictive accuracy compared to the previous model and effectively captures the continuous swelling process. Additionally, this approach provides a numerical tool for calculating the evolution of potential energy and dielectric constant within interlayer spaces. © 2025 Elsevier Ltd

关键词： Crystalline materials

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Nanotechnology applications in geothermal energy systems: Advances, challenges and opportunities

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Advances in Geo-Energy Research 2025年第2期15卷 172-180页

作者： Meng, Boyan Yan, Guoqiang He, Pan Zhou, Qitao Xu, Wenxia Qiao, Yangyang Three Gorges Geotechnical Consultants Co. Ltd. Wuhan430074 China Geothermal Engineering Research Center CISPDR Corporation Wuhan430074 China Institute of Applied Geosciences Karlsruhe Institute of Technology Karlsruhe76131 Germany State Key Laboratory of Biogeology and Environmental Geology Engineering Research Center of Nano-Geomaterials of the Ministry of Education Faculty of Materials Science and Chemistry China University of Geosciences Wuhan430074 China

Geothermal energy offers a sustainable solution to meet growing energy needs while mitigating environmental concerns associated with conventional fossil fuel sources. Meanwhile, nanotechnology presents innovative solutions to enhance the performance of renewable energy systems. However, its specific applications in geothermal energy are a dynamic field and have not been systematically reviewed. This paper presents an overview of the latest advancements in utilizing nanotechnology to enhance geothermal energy systems. The essential role of nanotechnology is examined across the entire life-cycle of geothermal development and utilization, encompassing various aspects including geothermal well construction, geothermal reservoir characterization, scaling and corrosion prevention, and resource recovery. The results suggest that nanotechnology holds significant promise for improving the efficiency, longevity, and profitability of geothermal energy systems. Furthermore, this paper outlines the potential challenges associated with nanotechnology adoption in technical, environmental, and economic terms, and offers strategies for mitigating them. Finally, the paper discusses some future perspectives on how nanotechnology can further advance geothermal energy, contributing to the global transition to a clean and renewable energy future. © The Author(s) 2025.

关键词： Clean energy

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Late Triassic to Jurassic Tectonic Evolution of the Northern Sichuan Foreland Basin, South China Craton

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Geological Journal 2025年第2期60.0卷 531-559页

作者： Xiong, Can Yang, Xiangyang Dong, Yunpeng Xiao, Ming Wei, Zhaoying Feng, Yanbo Sun, Jiaopeng Xiang, Lingzi Yu, Lin Xie, Songlin Wang, Cuifang Zhang, Songlin No. 208 Hydrogeological and Engineering Geological Team Chongqing Bureau of Geological and Mineral Resource Exploration and Development Chongqing China Chongqing Key Laboratory of Paleontology and Paleoenvironment Co-evolution (Sichuan-Chongqing Joint Construction) Chongqing China Department of Geotechnical Engineering Chongqing Jiaotong University Chongqing China State Key Laboratory of Continental Dynamics Department of Geology Northwest University Xi'an China College of Civil Engineering Chongqing University of Arts and Sciences Chongqing China Yunyang Geopark Management Affairs Center Chongqing China

The Northern Sichuan Foreland Basin, which is located in the northwest of South China Craton (SCC), was formed by the intracontinental thrusting between the Qinling Orogenic Belt (QOB) and SCC. The Upper Triassic to Jurassic sedimentary successions within this foreland basin, contain crucial information for revealing the intracontinental deformation sequence between the QOB and the SCC. In this study, based on a systematic dataset, including the palaeocurrent orientation, sandstone modal composition, and detrital zircons U–Pb age data, we attempt to reveal the tectonic processes during the Late Triassic to Jurassic interval. The palaeocurrent orientations, which is primarily directed in the southward and northwestward directions, indicate that the sediments were sourced from the north and southeast. The sandstone clastic components reveal multiple sources, including the magmatic arc and continental crust. Detrital zircons from six samples yield six major U–Pb age groups, including 2650–2350, 2050–1720, 1000–620, 520–380, 350–210, and 205–160 Ma. The Upper Triassic sediments contain a relatively high density of 2490, 1860, 810, 440, and 230 Ma, which are mostly consistent with the QOB, northern SCC and Jiangnan Suture Zone provenances. The majority age population of 2050–1750 Ma observed within the Xujiahe Formation, is considered to be primarily sourced from northern SCC, suggesting the uplift and erosion of the northern SCC, probably imply extreme shortening between the QOB and SCC. The Baitianba and Xintiangou formations, which contain lesser 2050–1720 Ma aged zircons, indicate a period of lacustrine expansion and tectonic quiescence after the shortening. The Middle Jurassic Shaximiao Formation, and the Upper Jurassic Suining and Penglaizhen formations, involve a major age population of 2050–1720 Ma that were sourced from northern SCC, indicate another phase of uplifting of the northern SCC related to a second stage of extreme intracontinental shortening and defor

关键词： detrital zircons U–Pb age Northern Sichuan Foreland Basin palaeocurrent orientation Qinling Orogenic Belt Southern China Craton

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A Quantitative Method for Predicting the Fragmentation Range in Rock Blasting Based on the Dynamic Coupling Effect of in Situ Stress and Explosive Load

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International Journal of geomechanics 2025年第7期25卷

作者： Zhu, Jin Yan, Peng Liu, Xiao Zhang, Xiangyu Lu, Wenbo Chen, Ming Wang, Gaohui Huang, Shuling State Key Laboratory of Water Resources Engineering and Management Wuhan Univ. Wuhan430072 China Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources Changjiang River Scientific Research Institute Wuhan430010 China

The rock blasting crush zone and fracture zone develop in the direction of major principal stress under the influence of in situ stress. However, there is still a lack of an accurate calculation method for predicting the dynamic influence of in situ stress on the range of these two zones. This paper examined the failure process of the crush zone and fracture zone under dynamic load through the dynamic stress paths of a rock mass. A novel quantitative method for the size of these two zones based on the dynamic coupling effect of in situ stress and explosive load was proposed. Its effectiveness was verified by single-hole blast cracking experiments. The results showed that the method can quantitatively describe the blast damage zone under coupled loading. The accurate determination of the attenuation coefficient (α) of the blast wave in the rock mass is the key to realizing the quantification. In this paper, the inverse proportional function relationship between α and proportional distance (r/a) can be well used to describe this relationship. As the in situ stress increases, the area of the crush zone and the fracture zone produced by the explosion gradually reduces. As the unit in situ stress increases, the degree of reduction in these two zones also reduces. However, due to the difference between r/a and α, this rule is more obvious in the fracture zone. According to the calculation, the radius limit of the fracture zone is lowered by around 50% and the normal stress increases to approximately one times the dynamic tensile strength when the rock mass with a tensile strength of 10.8 MPa is blasted by an emulsion explosive. As the explosion damage range in the low-in situ stress ( © 2025 American Society of Civil Engineers.

关键词： Cracks

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