| 岩石/结构面劣化导致巴东组软硬互层岩体强度劣化的作用机制 |
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| 引用本文： | 亢金涛,吴琼,唐辉明,胡新丽,范亮亮,张抒,易鑫.岩石/结构面劣化导致巴东组软硬互层岩体强度劣化的作用机制[J].地球科学,2019,44(11):3950-3960. |
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| 作者姓名： | 亢金涛 吴琼 唐辉明 胡新丽 范亮亮 张抒 易鑫 |
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| 作者单位： | 1.中国地质大学工程学院, 湖北武汉 430074 |
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| 基金项目： | 国家自然科学基金面上项目41877259湖北省自然科学基金面上项目2018CFB666国家重点研发计划项目2017YFC1501301中央高校基本科研业务费专项资金资助项目CUGQY1929国家自然科学基金青年项目41807271 |
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| 摘 要： | 岩石/结构面劣化导致巴东组软硬互层岩体强度劣化的作用机制是揭示三峡库区库岸消落带巴东组软硬互层岩体强度渐进劣化机理和评价库岸边坡稳定性的关键问题.以三峡库区典型"易滑岩组"巴东组第二段红色系列的砂岩与粉砂质泥岩互层岩组为研究对象，考虑干湿循环条件下岩石/结构面参数劣化，开展了软硬互层岩体单轴压缩数值试验，分析了软岩/硬岩/层面劣化对巴东组软硬互层岩体单轴压缩强度劣化的贡献度及其与岩层倾角的关系.研究结果表明，不同岩层倾角条件下，软岩/硬岩/层面劣化对巴东组软硬互层岩体单轴压缩强度劣化的影响有明显区别，以软岩/硬岩/层面劣化对巴东组软硬互层岩体单轴压缩强度劣化的贡献度为依据，将岩层倾角全范围划分为软岩控制区、软岩-硬岩-层面共同控制区、沿层面滑移失稳破坏区和硬岩控制区，揭示了岩石/结构面劣化导致巴东组软硬互层岩体强度劣化的作用机制及其受岩层倾角的影响，为进一步研究库岸消落带巴东组软硬互层岩体强度渐进劣化机理奠定了基础.
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| 关 键 词： | 巴东组 软硬互层岩体 强度劣化 单轴压缩强度 岩层倾角 工程地质 |
| 收稿时间： | 2018-02-21 |
Strength Degradation Mechanism of Soft and Hard Interbedded Rock Masses of Badong Formation Caused by Rock/Discontinuity Degradation |
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| Abstract: | Strength degradation mechanism of soft and hard interbedded rock mass of Badong Formation caused by rock/discontinuity degradation is the key issue to reveal progressive strength deterioration mechanism of soft and hard interbedded rock mass of Badong Formation in hydro-fluctuation belt of reservoir bank and to evaluate the stability of reservoir bank slope in the Three Gorges area. Sandstone and silty mudstone of the typical sliding-prone soft and hard interbedded rock masses of Badong Formation in the Three Gorges area were taken as the research object to conduct uniaxial compression numerical test, considering the deterioration of rock/discontinuity parameters under the condition of drying-wetting cycle, the contribution of soft rock/hard rock/bedding plane degradation to the uniaxial compression strength degradation of soft and hard interbedded rock masses in the Badong Formation and its relationship with the dip angle are analyzed. The results indicate that the influence of soft rock/hard rock/bedding plane deterioration on the uniaxial compression strength degradation of soft and hard interbedded rock mass in the Badong Formation has obvious difference under different dip angles. The dip angle is divided into soft rock control zone, soft rock-hard rock-bedding plane common control zone, slip failure zone along the bedding plane and hard rock control zone based on their contribution. The results reveal the mechanism of strength degradation of soft and hard interbedded rock mass caused by rock/discontinuity deterioration and the influence of dip angle, which provides the basis for revealing the progressive strength deterioration mechanism of soft and hard interbedded rock masses of the Badong Formation in hydro-fluctuation belt of reservoir bank. |
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