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学者姓名：张元超
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Abstract ：
Shear-induced rock bridge fractures greatly threaten the stability of rock slopes and deep rock masses, owing to their connection with pre-existing discontinuities. In this research, direct shear tests on sandstone rock bridges were performed under constant normal stiffness (CNS) conditions. The effects of rock bridge length, initial normal stress and normal stiffness on the shear behavior of rock bridges were carefully investigated, encompassing both the pre-failure (cracking phase) and post-failure (sliding phase) stages. Test results revealed that these three factors variably impact the shear strength, dilation characteristics, failure pattern and acoustic emission response of the rock bridges. In particular, normal stiffness was found to greatly affect the post-peak slip behavior. It was observed that shear-induced rock bridge fractures exhibit distinctive shear contraction characteristics, which contrast with tension-induced splitting fractures that are typically marked by shear dilation. The shear contraction mechanism of rock bridge fractures was elucidated using a conceptual cracking model, termed the TST model. This research contributes fresh insights to the comprehension of dynamic slip hazards prompted by the rupture of rock bridges in deep rock engineering.
Keyword ：
Constant normal stiffness Constant normal stiffness Direct shear tests Direct shear tests Rock bridge Rock bridge Shear contraction Shear contraction Shear-induced fractures Shear-induced fractures
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| GB/T 7714 | Zhang, Yuanchao , Huang, Ming , Jiang, Yujing et al. Shear contraction mechanism and mechanical behavior of shear-induced rock bridge fractures under constant normal stiffness conditions [J]. | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2025 , 84 (1) . |
| MLA | Zhang, Yuanchao et al. "Shear contraction mechanism and mechanical behavior of shear-induced rock bridge fractures under constant normal stiffness conditions" . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT 84 . 1 (2025) . |
| APA | Zhang, Yuanchao , Huang, Ming , Jiang, Yujing , Yin, Qian , Jiang, Song , Ming, Shengliang et al. Shear contraction mechanism and mechanical behavior of shear-induced rock bridge fractures under constant normal stiffness conditions . | BULLETIN OF ENGINEERING GEOLOGY AND THE ENVIRONMENT , 2025 , 84 (1) . |
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The utilization of waste gangue concomitant with coal mining to construct roadway support structures embodies an advanced concept of resource recycling. However, these structures are inevitably subjected to continuous disturbances of static-dynamic combined loads during service life. This research explores the mechanical responses and reinforcement mechanisms of anchored cemented gangue backfill materials (CGBM) under static- dynamic combined loads. The fractal grading theory was introduced to control particle size distribution of aggregates, and the anchored cemented gangue backfill samples (CGBS) were casted by cementitious materials and waste gangue. Then, the static-dynamic combined loading tests regarding various pre-static loads (Ps), dynamic load amplitudes (Pd) and pre-tightening forces (Pt) were conducted. The results reveal that the mechanical properties, bolt axial force evolution, AE responses and failure modes of anchored CGBS exhibit marked differences. The peak stress of anchored CGBS decreases progressively with increasing Ps and Pd, while it initially increases and then decreases with increasing Pt. During dynamic loading, the irreversible strain exhibits an "accelerate-constant" increasing pattern, with corresponding hysteresis curves transitioning from "sparse-dense" characteristics. During dynamic loading, the expansion deformation induced by loading decreases, while the recoverable expansion deformation during unloading increases, resulting in a gradual decay of the upper and lower limit stresses of the bolt axial force. Stress concentration near the bolt hole region alters the stress transfer path, promoting the formation of shear failure surfaces. As the degradation effects of dynamic loading intensify, the ultimate failure mode transitions from inclined shear failure to conjugate shear failure penetrating the bolt hole. The findings offer a scientific foundation for coal gangue recycling and theoretical guidance for enhancing anchoring parameters and evaluating long-term stability of support structures along gob-side entry.
Keyword ：
AE evolution AE evolution Bolt axial force Bolt axial force Cemented gangue backfill materials Cemented gangue backfill materials Failure modes Failure modes Fatigue loading Fatigue loading Mechanical responses Mechanical responses
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| GB/T 7714 | Nie, Xinxin , Yin, Qian , Tao, Zhigang et al. Mechanical responses of anchored cemented gangue backfill materials subjected to static-dynamic combined loads [J]. | INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS , 2025 , 175 . |
| MLA | Nie, Xinxin et al. "Mechanical responses of anchored cemented gangue backfill materials subjected to static-dynamic combined loads" . | INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS 175 (2025) . |
| APA | Nie, Xinxin , Yin, Qian , Tao, Zhigang , He, Manchao , Wu, Jiangyu , Wang, Gang et al. Mechanical responses of anchored cemented gangue backfill materials subjected to static-dynamic combined loads . | INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS , 2025 , 175 . |
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在近接施工问题中,精准评估邻近建筑施工对既有建、构筑物的影响较为困难,且无法进行智能化预测.文章基于IFC拓展模型,建立4个包含隧道变形影响因素的拓展属性集,并结合机器学习算法及Python编程语言,提出一种邻近施工影响下既有隧道变形的智能预测方法.首先,通过数值模拟方法进行力学仿真试验和邻近施工工况模拟,得到两者对应的时序数据集以补充拓展属性集的信息;然后,通过数据处理手段,完善监测信息和场地降雨的时序数据集;最后,采用LSTM机器学习算法对4种时序数据集进行学习,以此建立完整的智能预测方法.结果表明:建立的力学仿真数据集、加卸载数据集、桩基施工数据集及场地降雨数据集对隧道变形产生不同程度的影响,基于LSTM的智能预测方法可以很好地预测邻近施工复杂环境下既有隧道的变形.
Keyword ：
IFC模型 IFC模型 地铁 地铁 数值模拟 数值模拟 智能建造 智能建造 机器学习 机器学习
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| GB/T 7714 | 安武斌 , 游黄斌 , 黄睿奕 et al. 邻近施工对既有地铁隧道变形影响分析及智能预测 [J]. | 现代城市轨道交通 , 2025 , (3) : 18-25 . |
| MLA | 安武斌 et al. "邻近施工对既有地铁隧道变形影响分析及智能预测" . | 现代城市轨道交通 3 (2025) : 18-25 . |
| APA | 安武斌 , 游黄斌 , 黄睿奕 , 冯萌萌 , 张元超 , 黄明 . 邻近施工对既有地铁隧道变形影响分析及智能预测 . | 现代城市轨道交通 , 2025 , (3) , 18-25 . |
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The assessment of long-term stability of rocks surrounding a tunnel considering rock weathering is a challenging topic in tunnel engineering. In this study, a new stability analysis model for wet -dry (W -D) sensitive rocks surrounding underground excavations is presented. Based on the disturbed state concept (DSC) theory, the excavation disturbed zones (EDZ) of a tunnel are defined and their evolution characteristics during the tunnel excavation stage and the operation stage are analyzed. Based on the characteristics of the damage and stress states of rocks at different deformation stages, the concept of disturbance in the DSC theory is extended and the concepts of elastic disturbance and plastic disturbance are proposed. Both disturbance functions are derived based on the Mohr -Coulomb yield criterion considering the W -D rock weathering deterioration. From these functions, a DSC-based stability analysis model for W -D sensitive rocks surrounding underground excavations is established. The proposed model is implemented in the finite difference software FLAC3D and verified using a simple numerical model. As a case study, the effectiveness of the mitigation measures for the problematic section of the South Lvliang Mountain Tunnel is evaluated by the proposed model. It has been demonstrated that the formation of EDZ around the tunnel is a dynamic process which gradually evolves with the tunnel excavation, operation and weathering deterioration of surrounding rocks. The proposed stability analysis model can better analyze the disturbance evolution characteristics of W -D sensitive rocks surrounding a tunnel over its full life cycle and is a more comprehensive evaluation tool for tunnel stability assessment considering rock weathering deterioration.
Keyword ：
Disturbed state concept Disturbed state concept Gypsum strata Gypsum strata Rock disturbance Rock disturbance Tunnel stability analysis Tunnel stability analysis Wet -dry sensitive rocks Wet -dry sensitive rocks
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| GB/T 7714 | Huang, Ming , Jiang, Song , Zhang, Yuanchao et al. A new stability analysis model for wet-dry sensitive rocks surrounding underground excavations based on disturbed state concept theory [J]. | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2024 , 174 . |
| MLA | Huang, Ming et al. "A new stability analysis model for wet-dry sensitive rocks surrounding underground excavations based on disturbed state concept theory" . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES 174 (2024) . |
| APA | Huang, Ming , Jiang, Song , Zhang, Yuanchao , Jiang, Yujing , Zhang, Xudong , Xu, Chaoshui . A new stability analysis model for wet-dry sensitive rocks surrounding underground excavations based on disturbed state concept theory . | INTERNATIONAL JOURNAL OF ROCK MECHANICS AND MINING SCIENCES , 2024 , 174 . |
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To reveal the mechanism of shear failure of en-echelon joints under cyclic loading,such as during earthquakes,we conducted a series of cyclic shear tests of en-echelon joints under constant normal stiffness(CNS)conditions.We analyzed the evolution of shear stress,normal stress,stress path,dilatancy characteristics,and friction coefficient and revealed the failure mechanisms of en-echelon joints at different angles.The results show that the cyclic shear behavior of the en-echelon joints is closely related to the joint angle,with the shear strength at a positive angle exceeding that at a negative angle during shear cycles.As the number of cycles increases,the shear strength decreases rapidly,and the difference between the varying angles gradually decreases.Dilation occurs in the early shear cycles(1 and 2),while contraction is the main feature in later cycles(3-10).The friction coefficient decreases with the number of cycles and exhibits a more significant sensitivity to joint angles than shear cycles.The joint angle determines the asperities on the rupture surfaces and the block size,and thus determines the subsequent shear failure mode(block crushing and asperity degradation).At positive angles,block size is more greater and asperities on the rupture surface are smaller than at nonpositive angles.Therefore,the cyclic shear behavior is controlled by block crushing at positive angles and asperity degradation at negative angles.
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| GB/T 7714 | Bin Wang , Yujing Jiang , Qiangyong Zhang et al. Cyclic shear behavior of en-echelon joints under constant normal stiffness conditions [J]. | 岩石力学与岩土工程学报（英文版） , 2024 , 16 (9) : 3419-3436 . |
| MLA | Bin Wang et al. "Cyclic shear behavior of en-echelon joints under constant normal stiffness conditions" . | 岩石力学与岩土工程学报（英文版） 16 . 9 (2024) : 3419-3436 . |
| APA | Bin Wang , Yujing Jiang , Qiangyong Zhang , Hongbin Chen , Richeng Liu , Yuanchao Zhang . Cyclic shear behavior of en-echelon joints under constant normal stiffness conditions . | 岩石力学与岩土工程学报（英文版） , 2024 , 16 (9) , 3419-3436 . |
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Abstract ：
To reveal the mechanism of shear failure of en-echelon joints under cyclic loading, such as during earthquakes, we conducted a series of cyclic shear tests of en-echelon joints under constant normal stiffness (CNS) conditions. We analyzed the evolution of shear stress, normal stress, stress path, dilatancy characteristics, and friction coefficient and revealed the failure mechanisms of en-echelon joints at different angles. The results show that the cyclic shear behavior of the en-echelon joints is closely related to the joint angle, with the shear strength at a positive angle exceeding that at a negative angle during shear cycles. As the number of cycles increases, the shear strength decreases rapidly, and the difference between the varying angles gradually decreases. Dilation occurs in the early shear cycles (1 and 2), while contraction is the main feature in later cycles (3-10). The friction coefficient decreases with the number of cycles and exhibits a more significant sensitivity to joint angles than shear cycles. The joint angle determines the asperities on the rupture surfaces and the block size, and thus determines the subsequent shear failure mode (block crushing and asperity degradation). At positive angles, block size is more greater and asperities on the rupture surface are smaller than at nonpositive angles. Therefore, the cyclic shear behavior is controlled by block crushing at positive angles and asperity degradation at negative angles. (c) 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/ licenses/by-nc-nd/4.0/).
Keyword ：
Constant normal stiffness (CNS) Constant normal stiffness (CNS) Cyclic shear tests Cyclic shear tests En-echelon joint En-echelon joint Normal displacement Normal displacement Shear stress Shear stress
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| GB/T 7714 | Wang, Bin , Jiang, Yujing , Zhang, Qiangyong et al. Cyclic shear behavior of en-echelon joints under constant normal stiffness conditions [J]. | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING , 2024 , 16 (9) : 3419-3436 . |
| MLA | Wang, Bin et al. "Cyclic shear behavior of en-echelon joints under constant normal stiffness conditions" . | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 16 . 9 (2024) : 3419-3436 . |
| APA | Wang, Bin , Jiang, Yujing , Zhang, Qiangyong , Chen, Hongbin , Liu, Richeng , Zhang, Yuanchao . Cyclic shear behavior of en-echelon joints under constant normal stiffness conditions . | JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING , 2024 , 16 (9) , 3419-3436 . |
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Understanding the shear-induced dilatancy of rock fractures is important for assessing the permeability evolution and seismic hazard in shale and geothermal reservoirs. The displacement dependence of fracture dilation has been well studied, while the influence of slip velocity is poorly constrained. In this study, we combined displacement- and velocity-dependent aperture models to reproduce the transient shear-induced dilatancy of fractures in sandstone in 16 normal stress unloading tests. Our results show that the combined aperture model can describe the transient fracture aperture evolution during accelerating slip induced by normal stress unloading better than the model dependent only on slip displacement. Slip velocity could enhance the aperture increase on smoother fractures at lower normal stresses and higher slip velocities. Both the dilation factor and characteristic slip distance decrease with increasing normal stress and surface roughness, signifying reduced contribution of slip velocity to transient shear-induced dilatancy at higher normal stresses and surface roughness. The dilation angle increases with the increase of surface roughness, and this increase diminishes at higher normal stresses primarily attributable to more severe asperity wear. These findings highlight the importance of slip velocity in controlling the transient evolution of aperture and permeability of a rock fracture. Our study also provides constraints on the constitutive parameters in the combined aperture model for describing transient shear-induced fracture dilatancy. We suggest that it is crucial to incorporate the velocity-dependent aperture model to simulate the nonlinear evolution of fracture aperture in future analytical and numerical models involving coupled hydromechanical processes in geoenergy systems.
Keyword ：
Fracture and flow Fracture and flow Fractures, faults, and high strain deformation zones Fractures, faults, and high strain deformation zones Permeability and porosity Permeability and porosity
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| GB/T 7714 | Zhang, Supeng , Ji, Yinlin , Hofmann, Hannes et al. Temporal evolution of shear-induced dilatancy of rock fractures: controls from surface roughness and normal stress [J]. | GEOPHYSICAL JOURNAL INTERNATIONAL , 2024 , 238 (1) : 199-213 . |
| MLA | Zhang, Supeng et al. "Temporal evolution of shear-induced dilatancy of rock fractures: controls from surface roughness and normal stress" . | GEOPHYSICAL JOURNAL INTERNATIONAL 238 . 1 (2024) : 199-213 . |
| APA | Zhang, Supeng , Ji, Yinlin , Hofmann, Hannes , Yin, Qian , Li, Shouding , Zhang, Yuanchao . Temporal evolution of shear-induced dilatancy of rock fractures: controls from surface roughness and normal stress . | GEOPHYSICAL JOURNAL INTERNATIONAL , 2024 , 238 (1) , 199-213 . |
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