阿海水电站进场公路K62滑坡动态变形监测及三维数值分析  

Dynamic deformation monitoring and three-dimensional numerical analysis of K62 landslide of approach road of A'hai Hydropower Station

作　　者：王忠福[1,2] 刘汉东[1] 何思明[2] 

机构地区：[1]华北水利水电大学岩土工程与水工结构研究院,河南郑州450045 [2]中国科学院水利部成都山地灾害与环境研究所,成都600011

出　　处：《岩土工程学报》2013年第S2期94-100,共7页Chinese Journal of Geotechnical Engineering

基　　金：水利部公益性行业科研专项经费项目(201301034);国家自然科学基金项目(41140030);郑州市创新型科技人才培育计划领军人才项目(10LJRC185)

摘　　要：滑坡的变形破坏是一个复杂的动态过程,通过对阿海水电站进场公路K62滑坡变形进行现场监测,获得了大量地表变形监测数据,研究了该滑坡的变形规律。研究结果表明:受地形、地貌及地质条件的影响,滑坡体变形速率非同步性。滑坡体变形规律表现出两头大中间小的特点,滑坡上部水平变形速率最大达到4.06 mm/d,中部变形0.18mm/d,下部变形达到48.6 mm/d,变形破坏机制表现为前缘牵引后缘平推,滑坡中部起挡墙锁固的作用;基于实测变形,利用均匀设计方法与人工神经网络相结合,建立了滑坡体及滑带土参数反算的RBF神经网络模型,获得了滑坡体及滑带土的力学参数。并利用FLAC3D数值模拟了滑坡在变形过程中滑坡体内的位移场、塑性破坏区分布的规律。研究结果为滑坡工程治理设计提供参考。The deformation and failure of landslides is a complex dynamic process. Through field deformation monitoring of K62 landslide of approach road of A'hai Hydropower Station, a large number of ground surface deformation data are collected, and the deformation laws of the landslide are analyzed. The results show that under the effects of topographical, geomorphological and geological conditions, the rate of surface deformation is asynchronous. The landslide deformation is larger in the upper and lower parts than that in the middle part, and the deformation rates of the landslide are up to 4.06, 0.18 and 48.6 mm/d in the upper, middle and lower parts, respectively. The deformation and failure mechanisms are as follows: drawing of the leading edge pushing of the trailing edge and retaining wall locking of the middle part of the landslide. By means of the uniform design method and artificial neural network based on the measured deformation, a RBF neural network model for Back analysis of the soil parameters of the landslide and slip zone is established. The mechanical parameters are obtained. The FLAC3D numerical simulation method is adopted to simulate the stress field, distribution of displacement and plastic zone of K62 landslide during dynamic deformation process. The simulated results are consistent with the monitoring ones and provide the design reference for the landslide.

关 键 词：滑坡 变形监测 RBF人工神经网络模型 FLAC3D 反分析 

分 类 号：U418.5[交通运输工程—道路与铁道工程] P642.22[天文地球—工程地质学]