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金沙江库岸牛滚凼堆积体滑坡稳定性分析 被引量:1

Stability Analysis of Niugundang Deposit Landslide on Bank of Jinsha River
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摘要 该文针对金沙江库岸牛滚凼滑坡在一个库水调度周期内的稳定性变化开展研究,采用有限元分析软件(Geo-Studio),分析库水位变化、降雨及其共同作用等环境因素对堆积体岸坡稳定性的影响规律。结果表明:在一个库水位调度周期内,该滑坡最易发生滑动的时刻出现在库水位下降且伴随有降雨时,最不稳定的位置在滑坡中部;滑坡安全系数变化与库水位变化趋势基本一致,库水位不变时,降雨渗透导致滑坡坡面岩土力学参数降低、地下水位线上升从而影响滑坡的稳定性,安全系数下降;前缘滑动和整体滑动除在蓄水前的偶然工况(自然条件+地震)外,稳定性满足规范要求,但安全系数均较低,属于欠稳定性滑坡,在遇到特殊外力(如极端降雨、地震等)时有发生滑动的可能,需加强对岸坡的稳定性监测。 In this paper,the stability change of Niugundang Landslide on the bank of Jinsha River in a reservoir water regulation cycle is studied.The influence law of environmental factors such as reservoir water level change,rainfall and their interaction on the stability of the accumulation body bank slope is analyzed by using the finite element analysis software(Geo-Studio).The results show that:In a period of reservoir water level regulation,the most likely sliding time of the landslide occurs when the reservoir water level drops and accompanied by rainfall,and the most unstable position is in the middle of the landslide;The variation trend of landslide safety factor is basically consistent with that of reservoir water level.When the reservoir water level is constant,the rainfall infiltration leads to the decrease of geotechnical parameters of landslide slope surface and the rise of groundwater level,which affect the stability of landslide and decreases the safety factor;In addition to the accidental conditions(natural condition+earthquake)before impoundment,the stability of leading edge sliding and overall sliding meets the requirements of the specification,but the safety factor is lower,it belongs to the unstable landslide,so it is possible to slide when encountering special external forces(such as extreme rainfall,earthquake,etc.),so it is necessary to strengthen the stability monitoring of bank slope.
作者 方波 李仁江 冷先伦 殷秋雨 付晓东 Fang Bo;Li Renjiang;Leng Xianlun;Yin Qiuyu;Fu Xiaodong(College of Civil Engineering and Architecture,Anhui University of Science and Technology;Institute of Rock and Soil Mechanics,Chinese Academy of Sciences;China Three Gorges Corporation Relocation&Resettlement Bureau;College of Civil Engineering and Environment,Hubei University of Technology)
出处 《勘察科学技术》 2020年第6期25-30,48,共7页 Site Investigation Science and Technology
基金 国家重点研发计划重大科学仪器设备开发重点专项(No.2017YFF0108705、2017YFF0108706) 国家自然科学基金(No.51779250)。
关键词 库岸边坡 堆积体 极限平衡 稳定性分析 库水位变化 降雨 reservoir bank slope accumulation limit equilibrium stability analysis reservoir water level change rainfall
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