基于数值模拟与位移监测的滑坡抗剪强度参数反演分析研究

摘要

三峡库区地质灾害三期监测项目中存在一些滑坡没有进行滑带土室内剪切试验,对于如何较准确选取这类滑坡抗剪强度参数目前研究还比较少.提出以区域统计规律及工程地质类比方法得到的滑坡抗剪强度参数初选值为基础,以滑坡在三峡库区库水位调度下选取计算工况下的监测位移及其趋势为判断依据,采用数值模拟手段对滑坡的抗剪强度参数进行反演分析,最后结合宏观变形与位移监测对反演结果进行检验.以三峡库区某滑坡为例,运用FLAC3D数值模拟软件得到该滑坡的抗剪强度参数:c=20.0kPa；Φ=19.0°.%Abstrast; Slip zone soil shear tests have not been conducted in some landslides which are parts of the three periods of geological disaster monitoring projects in the Three Gorges Reservoir area. At present the parameters for this kind of landslides is insufficient. This article introduces the numerical simulation method to determine the shear strength parameters by inversion analysis, which will be inspected with macro-deformation and displacement monitoring data. Based on the primary values of shear strength parameters obtained with the engineering geological analogy method, a regional statistical rule and the landslide monitoring displacement trend in calculation conditions are selected from the scheduled water levels of the Three Gorges Reservoir area. Taking a landslide in the Three Gorges Reservoir area as an example, the shear strength parameters of the landslide are obtained by using the FLAC3D numerical simulation software, and the value is; c =20. 0 kPa, φ = 19.0°