水动力型滑坡堆积体渗流稳定性数值分析
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摘要
汛期强降雨对水动力型滑坡堆积体渗流稳定性有着重要影响.本文结合三板溪水电站库区东岭信滑坡堆积体工程,揭示了正常蓄水位条件下降雨入渗对深厚滑坡堆积体孔隙水压力变化的影响机理,开展了不同工况下滑坡堆积体渗流稳定性数值分析.数值计算结果表明,滑坡堆积体前缘局部稳定性主要受库水位和降雨入渗联合作用;滑坡堆积体中后部稳定性主要受降雨入渗影响,受库水位影响不明显,因此,汛期强降雨是影响深厚滑坡堆积体整体稳定性的关键因素,设置排水洞可有效提高东岭信滑坡堆积体整体稳定性.研究结果可为类似水动力型堆积体滑坡灾害治理与防范提供参考.
Heavy rainfall in flood season has important influence on the seepage stability of hydrodynamicinduced landslide deposits.Combining with the Donglingxin landslide deposits in the reservoir area of Sanbanxi Hydropower Station,the influence mechanism of rainfall infiltration on the change of pore water pressure of deep landslide deposits under normal water level conditions is revealed;and the numerical analysis of seepage stability of landslide accumulation body under different working conditions is carried out.The numerical calculation results show that the local stability of the front edge of landslide accumulation body is mainly affected by the combined action of reservoir water level and rainfall infiltration.The stability of the middle and trailing edges of the landslide deposits is mainly affected by rainfall infiltration;it is not significantly affected by reservoir water level.Therefore,the heavy rainfall during flood season is a key factor affecting the overall stability of the Donglingxin landslide deep deposits.The results can be used as a reference for landslide control and prevention of similar hydrodynamic accumulation body.The research results can provide reference for the treatment and prevention of similar hydrodynamic-induced landslide disasters.
Heavy rainfall in flood season has important influence on the seepage stability of hydrodynamicinduced landslide deposits.Combining with the Donglingxin landslide deposits in the reservoir area of Sanbanxi Hydropower Station,the influence mechanism of rainfall infiltration on the change of pore water pressure of deep landslide deposits under normal water level conditions is revealed;and the numerical analysis of seepage stability of landslide accumulation body under different working conditions is carried out.The numerical calculation results show that the local stability of the front edge of landslide accumulation body is mainly affected by the combined action of reservoir water level and rainfall infiltration.The stability of the middle and trailing edges of the landslide deposits is mainly affected by rainfall infiltration;it is not significantly affected by reservoir water level.Therefore,the heavy rainfall during flood season is a key factor affecting the overall stability of the Donglingxin landslide deep deposits.The results can be used as a reference for landslide control and prevention of similar hydrodynamic accumulation body.The research results can provide reference for the treatment and prevention of similar hydrodynamic-induced landslide disasters.
引文
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[7]周昌,胡新丽,徐楚,等.三峡库区滑坡消涨带变形破坏模型试验[J].中国公路学报,2018,31(2):252-260.
[8]赵宏渠,易武,黄海峰,夏俊宝.不同降雨强度下库岸滑坡体含水率及其稳定性分析[J].安全与环境工程,2016,23(6):53-58.
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[10]王恩志,王建新,王思敬.降雨入渗条件下交河故城土质崖体渗流场计算及稳定性分析[J].水文地质工程地质,2010,37(3):36-42.
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[12]代贞伟,魏云杰,侯时平.三峡库区杨家水井滑坡变形失稳机理研究[J].工程地质学报,2016,24(4):527-534.
[13]尚敏,徐鑫,等.基于降雨渗流场变化的三峡库区白水河滑坡变形机制与预测[J].中国地质灾害与防治学报,2016,27(2):26-32.
[14]阚露,胡鹏.不同降雨过程特征下的库区滑坡稳定性[J].黑龙江科技大学学报,2014,24(5):529-533.