本文简要介绍了高密度电法与音频大地电磁法在吉舒铁路路基勘测中的应用效果。通过采用不同方法对不同视电阻率的岩土界面加以区分,分析吉舒铁路路基在不同岩土地层条件下的特点及地球物理特性,在吉舒40 km (K49-633-753)段应用高密度...本文简要介绍了高密度电法与音频大地电磁法在吉舒铁路路基勘测中的应用效果。通过采用不同方法对不同视电阻率的岩土界面加以区分,分析吉舒铁路路基在不同岩土地层条件下的特点及地球物理特性,在吉舒40 km (K49-633-753)段应用高密度电法与音频大地电磁法了解地层起伏、探查岩土上下层电阻率变化、探测地基土均匀性等,发现并揭示了吉舒铁路路基视电阻率与地基土地球物理指标之间的相关规律。同时揭示了铁路路基发生地质灾害的机理。展开更多
To investigate the dynamic behavior and energy dissipation of the rock−concrete interface,dynamic splitting tests on bi-material discs were conducted by using the split Hopkinson pressure bar.The test results reveal t...To investigate the dynamic behavior and energy dissipation of the rock−concrete interface,dynamic splitting tests on bi-material discs were conducted by using the split Hopkinson pressure bar.The test results reveal that with the change of the interface inclination angles(θ),the influence of interface groove width on the bearing capacity of specimens also varies.Whenθincreases from 0°to 30°,the bearing capacity of the specimen increases first and then decreases with the rise of the interface groove width;the optimal groove width on the rock surface in this range of interface inclination angles is 5 mm.Whenθincreases from 45°to 90°,the bearing capacity of the specimen has no obvious change.Moreover,whenθincreases from 0°to 45°,the dissipated energy of the specimens rises obviously at first and then tends to be stable as the width of the interface groove increases.展开更多
In order to evaluate the feasibility of safe mining close to the contact zone under reduced security coal pillar conditions at a coal mine in eastern China, the interaction mechanism of the interface between deep buri...In order to evaluate the feasibility of safe mining close to the contact zone under reduced security coal pillar conditions at a coal mine in eastern China, the interaction mechanism of the interface between deep buried sand and a paleo-weathered rock mass was investigated in the laboratory by direct shear testing. A DRS-1 high pressure soil shear testing machine and orthogonal design method were used in the direct shear tests. Variance and range methods were applied to analyze the sensitivity of each factor that has an influence on the mechanical characters of the interface. The test results show that the normal pressure is the main influencing factor for mechanical characteristics of the interface, while the lithological characters and roughness are minor factors; the shear stress against shear displacement curve for the interface shows an overall hyperbola relationship, no obvious peak stress and dilatancy was observed.When the normal pressure is 6 MPa, the shear strengths of interfaces with different roughness are basically the same, and when the normal pressure is more than 8 MPa, the larger the roughness of the interface, the larger will be the shear strength; the shear strength has a better linear relationship with the normal pressure, which can be described by a linear Mohr–Coulomb criterion.展开更多
文摘本文简要介绍了高密度电法与音频大地电磁法在吉舒铁路路基勘测中的应用效果。通过采用不同方法对不同视电阻率的岩土界面加以区分,分析吉舒铁路路基在不同岩土地层条件下的特点及地球物理特性,在吉舒40 km (K49-633-753)段应用高密度电法与音频大地电磁法了解地层起伏、探查岩土上下层电阻率变化、探测地基土均匀性等,发现并揭示了吉舒铁路路基视电阻率与地基土地球物理指标之间的相关规律。同时揭示了铁路路基发生地质灾害的机理。
基金supported by the National Natural Science Foundation of China (No.41772313)the National Natural Science Foundation for Young Scientists of China (No.52104111)+3 种基金the Hunan Science and Technology Planning Project,China (No.2019RS3001)the Natural Science Foundation of Hunan Province,China (No.2021JJ30819)Key Science and Technology Project of Guangxi Transportation Industry (Research on fine blasting and disaster control technology of mountain expressway tunnel),Chinathe financial contribution and convey their appreciation for supporting this basic research。
文摘To investigate the dynamic behavior and energy dissipation of the rock−concrete interface,dynamic splitting tests on bi-material discs were conducted by using the split Hopkinson pressure bar.The test results reveal that with the change of the interface inclination angles(θ),the influence of interface groove width on the bearing capacity of specimens also varies.Whenθincreases from 0°to 30°,the bearing capacity of the specimen increases first and then decreases with the rise of the interface groove width;the optimal groove width on the rock surface in this range of interface inclination angles is 5 mm.Whenθincreases from 45°to 90°,the bearing capacity of the specimen has no obvious change.Moreover,whenθincreases from 0°to 45°,the dissipated energy of the specimens rises obviously at first and then tends to be stable as the width of the interface groove increases.
基金the National Natural Science Foundation of China(Nos.41172290 and40572160)
文摘In order to evaluate the feasibility of safe mining close to the contact zone under reduced security coal pillar conditions at a coal mine in eastern China, the interaction mechanism of the interface between deep buried sand and a paleo-weathered rock mass was investigated in the laboratory by direct shear testing. A DRS-1 high pressure soil shear testing machine and orthogonal design method were used in the direct shear tests. Variance and range methods were applied to analyze the sensitivity of each factor that has an influence on the mechanical characters of the interface. The test results show that the normal pressure is the main influencing factor for mechanical characteristics of the interface, while the lithological characters and roughness are minor factors; the shear stress against shear displacement curve for the interface shows an overall hyperbola relationship, no obvious peak stress and dilatancy was observed.When the normal pressure is 6 MPa, the shear strengths of interfaces with different roughness are basically the same, and when the normal pressure is more than 8 MPa, the larger the roughness of the interface, the larger will be the shear strength; the shear strength has a better linear relationship with the normal pressure, which can be described by a linear Mohr–Coulomb criterion.
