基于FLAC^(3D)的路堑边坡稳定性分析  

Stability Analysis of Cutting Slope Based on FLAC^(3D)

作　　者：罗贤欢 吴琦[1] LUO Xianhuan;WU Qi(North China University of Water Resources and Electric Power,Zhengzhou 450046,China)

机构地区：[1]华北水利水电大学,河南郑州450046

出　　处：《河南科技》2024年第3期60-64,共5页Henan Science and Technology

摘　　要：【目的】道路切割坡体、暴雨和车辆荷载等条件会对路堑边坡的稳定性造成极大的影响。本研究以辉县市上八里镇回龙村张沟边坡为例,根据边坡所处的环境特征,分析其在不同工况影响下的变形特征及稳定性,为边坡的防治提供依据。【方法】使用FLAC^(3D)软件对边坡进行数值模拟,研究边坡在天然和暴雨条件下的变形和稳定性,并调用FLAC^(3D)内置的Fish函数对路堑边坡坡前道路车辆产生的动荷载进行模拟,对动荷载下滑坡体内部的变形特征进行分析。【结果】(1)边坡在天然和暴雨情况下的稳定性系数分别为1.9和1.186;(2)坡前公路动荷载峰值由1×10^(5)N增加为1×10^(6)N时,坡脚处水平最大应变值增大13.4%,后缘水平最大应变值增大13.2%。【结论】暴雨降低了岩土体的强度,直接破坏了边坡的稳定性,坡前竖直方向动荷载增加了坡体水平方向剪切带的连续性,但其对坡体最大应变量造成的影响较小。[Purposes]The conditions of road cutting slope body,rainstorm and vehicle load have great in-fluence on the stability of cutting slope.In this study,zhanggou landslide in Huilong Village,Shangbali Town,Huixian City is taken as an example,to analyzes the deformation characteristics and stability of the landslide under the influence of different working conditions,so as to provide a basis for slope pre-vention.[Methods]The FLAC^(3D) software was used to simulate the deformation and stability of the slope under natural and rainstorm conditions,and the FLAC^(3D) built-in Fish function was called to simulate the dynamic load generated by the road vehicles before the cutting slope,and the deformation characteristics of the landslide body under the dynamic load were analyzed.[Findings]①The stability coefficient of the slope in natural and rainstorm conditions is 1.9 and 1.186 respectively;②When the peak dynamic load of the anterior slope highway increases from 1×10^(5)N to 1×10^(6)N,the horizontal maximum strain value at the slope foot increases by 13.4%,and the horizontal maximum strain value at the posterior edge increases by 13.2%.[Conclusions]The rainstorm reduces the strength of the rock and soil mass and di-rectly destroys the stability of the slope,and the vertical dynamic load before the slope increases the con-tinuity of the horizontal shear band,but the influence on the maximum stress variable of the slope body is small.

关 键 词：辉县市 路堑边坡 FLAC^(3D) 动荷载 稳定性 

分 类 号：U416.1[交通运输工程—道路与铁道工程]