大型深层滑坡滑带土力学强度参数综合选取研究

Comprehensive Analysis of Strength Parameter on Slip Soil in Large Deep Landslide

为探究大型深层滑坡滑带土力学强度参数选取方法,依托丽水市腊口镇下个寮滑坡,采用大型原位直剪试验、室内试验、工程类比法及参数反演法,综合确定滑带土力学强度参数;采用ABAQUS有限元数值模拟软件,分析下个寮滑坡典型滑面的滑带分布、应力分布以及位移情况。结果显示,坡体上出现2条明显塑性应变带,其中1条应变带处于强风化-中风化层面附近,与勘探平硐揭示的深层滑面位置基本一致。坡体在重力荷载作用下,水平位移在1~10 cm之间,最大位移出现在第1个大平台附近(约15.75 cm),与现场监测数据吻合。

In order to obtain strength parameters on slip soil of large deep landslide,in-situ direct shearing tests,lab geotechnical tests,the engineering analogy method and parameter inversion were applied comprehensively.Based on the obtained strength parameters on slip soil,the distribution of slide surface,stress distribution,displacement of landslide were analyzed by ABAQUS software.Results show that,there are two plastic strain zones on the landslide,one of which is near the boundary of strong weathered zone and mild weathered zone,which is consistent with slip surface revealed by exploration.the horizontal displacement of landslide is between 10^(-2) and 10^(-1) m,the maximum displacement is about 15.75 cm at the first large platform,which is consistent with the field monitoring data.The fact is that the strength parameters are reasonable,which can provide a reference for the analysis of strength parameters on slip soil under similar engineering geological conditions.