三峡库区秭归县龙王庙滑坡稳定性评价及变形机理分析  

Stability Evaluation and Deformation Mechanism Analysis of Longwangmiao Landslide in Zigui County,Three Gorges Reservoir Area

作　　者：杨鹏 侯珍珠 王梓帆 夏宇 肖诗荣[1] Yang Peng;Hou Zhengzhu;Wang Zifan;Xia Yu;Xiao Shirong(College of Civil Engineering &Architecture,China Three Gorges Univ.,Yichang 443002,China)

机构地区：[1]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2018年第6期39-43,共5页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金(41272310)

摘　　要：龙王庙滑坡自2005年三峡水库156m蓄水诱发变形以来,一直处于动态变形过程中,属于典型的水库型滑坡.在地质分析的基础上,通过数值模拟,分析滑坡在各个库水位工况条件下的渗流场、位移场、应力场、塑性区.分析结果表明,首次库水高水位蓄水运行启动滑坡变形,变形量最大、位移速度最快发生在库水下降的中后期及下降后的稳定时期(具有一定的滞后性);龙王庙滑坡变形机制为蠕滑-拉裂型,成因上属于动水压力型滑坡;在库水和降雨的反复作用下,龙王庙滑坡前缘将不断塌岸,滑带塑性区将逐渐由前缘向后缘发展直至贯通,滑坡最终将解体、下滑.The Longwangmiao landslide has been in the process of dynamic metamorphosis because the reservoir fluctuation of the Three Gorges Reservoir since 2005,which is typical of a reservoir landslide.Based on geological analysis,the seepage field,displacement field,stress field and plastic zone of landslide in various reservoir water level conditions are analyzed by numerical simulation.The analytical results show that the landslide starts to transform when the reservoir high water storage for the first time;the maximum deformation and the maximum displacement speed occur in the middle and late stage of the decline of the reservoir water level and the stable period after the decline (with certain hysteresis).The deformation mechanism of Longwangmiao landslide is creep-crack type,which belongs to dynamic water pressure type landslide.Under the repeated action of reservoir water and rainfall,the leading edge of Longwangmiao landslide will collapse continuously;and the plastic zone will gradually develop from the leading edge to the penetration;and the landslide will eventually disintegrate and decline.

关 键 词：三峡水库 水库滑坡 数值模拟 变形机理 

分 类 号：P642[天文地球—工程地质学]