基于降雨入渗概化模型的王家台滑坡岩土参数反演分析  

Inverse Analysis of Geotechnical Parameters of Wangjiatai Landslide Based on Generalized Rainfall Infiltration Model

作　　者：张新伟[1] 朱心广 冯春[2,3] 王心泉 刘新明 ZHANG Xin-wei;ZHU Xin-guang;FENG Chun;WANG Xin-quan;LIU Xin-ming(Beijing Institute of Geological & Prospecting Engineering, Beijing 100048, China;Key Laboratory for Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China;School of Engineering Science, University of Chinese Academy of Sciences, Beijing 100049, China)

机构地区：[1]北京市地质工程勘察院,北京100048 [2]中国科学院力学研究所流固耦合系统力学重点实验室,北京100190 [3]中国科学院大学工程科学学院,北京100049

出　　处：《科学技术与工程》2022年第9期3485-3490,共6页Science Technology and Engineering

基　　金：国家重点研发计划(2018YFC1505504)。

摘　　要：中国是滑坡灾害的多发国家,其中降雨是诱发滑坡灾害的主要原因。由于地质体具有非连续、非均匀、流固耦合、未知初始状态等特点,仅依靠有限的钻孔数据无法准确给出滑坡体的渗流参数及岩土力学参数。为了实现降雨入渗作用下滑坡体参数的快速反演,提出了可快速分析降雨入渗诱发滑坡灾害的力学模型。该模型根据降雨量、地表径流量及地下径流量综合确定滑体中的饱和程度,进而根据饱和度来折减或增加滑体的强度。通过将该模型内嵌于连续-非连续单元法(continuum-discontinum element method,CDEM)中,并且结合遗传算法,实现了王家台滑坡岩土参数的反演分析,经过现场监测数据与数值模拟结果的优化对比,给出了适用于降雨入渗概化模型的王家台滑坡当前岩土参数。China is a country with many landslide disasters,in which rainfall is the main reason to induce landslide disasters.Because the geological body is characterized by discontinuity,inhomogeneity,fluid-solid coupling and unknown initial state,it is difficult to accurately determine the seepage parameters and geotechnical parameters of the landslide body only by relying on the limited borehole data.In order to realize rapid inversion of landslide parameters under rainfall infiltration,a mechanical model which can quickly analyze the landslide disaster induced by rainfall infiltration was presented.In this model,the saturation degree in the sliding body was determined according to the rainfall,surface flow and subsurface,and then the strength of the sliding body was decreased or increased according to the saturation.By embedding the model into the continuous discontinuous element method(CDEM)and combining genetic algorithm,the inversion analysis of geotechnical parameters of Wangjiatai landslide was realized.Through the optimization and comparison of field monitoring data and numerical simulation results,the current geotechnical parameters of Wangjiatai landslide suitable for rainfall infiltration generalization model were given.

关 键 词：滑坡 岩土参数反演 降雨入渗 监测数据 数值模拟 连续-非连续单元法 

分 类 号：P694[天文地球—地质学]