库水位波动条件下黄土坡临江1~#崩滑堆积体稳定性研究

发布时间：2018-06-29 19:05

本文选题：黄土坡临江~#崩滑堆积体 + 地下水位、深部位移　；参考：《岩土力学》2017年S1期

【摘要】：水库蓄水是诱发三峡地区库岸滑坡的主要因素之一,开展库水位波动条件下滑坡稳定性研究意义重大。通过现场地质调查、原位监测、理论分析和数值模拟等手段,对三峡库区黄土坡临江1~#崩滑堆积体在库水位波动条件下的稳定性进行了研究。利用现场监测数据,分析了滑坡体地下水位与库区水位的关系、滑坡体深部不同高程处位移随时间的变化值以及库水位波动对滑坡体变形的影响。采用三维离散元程序"3DDEC",对临江1~#崩滑堆积体进行了数值模拟,分析了库水位波动条件下滑坡体内应力、应变的变化规律,并提出了考虑干湿循环作用的强度折减法,定义了安全系数的求解方法。研究结果表明,三维离散元法结合强度折减法研究水库滑坡是可行的;黄土坡临江1~#崩滑堆积体在目前的调水曲线作用下处于稳定状态;由2013年12月16日巴东地震前后滑坡堆积体的变形可现低烈度地震对滑坡体的稳定性影响不大。
[Abstract]:Reservoir water storage is one of the main factors that induce landslide in reservoir bank in the three Gorges area. It is of great significance to study the landslide stability under the condition of reservoir water level fluctuation. By means of in-situ geological investigation, in-situ monitoring, theoretical analysis and numerical simulation, the stability of the No. 1 ~ # landslide deposit body in the loess slope of the three Gorges reservoir under the condition of water level fluctuation is studied. Based on the field monitoring data, the relationship between the groundwater level of the landslide body and the water level of the reservoir area, the variation of displacement with time at different elevation points in the deep part of the landslide body and the influence of the fluctuation of the reservoir water level on the deformation of the landslide body are analyzed. The 3D discrete element program "3DDEC" is used to simulate the landslide body. The variation law of stress and strain in landslide body under the condition of water level fluctuation is analyzed, and the strength reduction method considering the effect of dry-wet cycle is put forward. The method of solving safety factor is defined. The results show that it is feasible to study the landslide of reservoir by three dimensional discrete element method combined with the strength reduction method, and the deposit body of No. 1 # landslide is in a stable state under the action of the current water transfer curve. According to the deformation of landslide accumulation before and after the Padong earthquake of December 16, 2013, the low intensity earthquake has little effect on the stability of landslide.
【作者单位】：中国科学院武汉岩土力学研究所岩土力学与工程国家重点实验室;中国科学院大学;贵州省交通规划勘察设计研究院股份有限公司;
【基金】：国家重点基础研究发展计划项目(973计划)(No.2011CB710602) 国家自然科学基金(No.51509243,No.51479191)~~
【分类号】：P642.21

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