Stability Analysis of Road Slope Under Rainfall Condition

doi:10.3969/j.issn.1674-0696.2018.10.07

Abstract

Abstract: Rainfall is the main predisposing factor of landslide in the factors such as man-made disturbance, earthquake and rainfall. Combing with the data of geological survey, drilling, geophysical prospecting, field investigation, laboratory test and data collection, Xinping-Daga Highway slope in Yuxi was taken as the research site, and the infinite slope model, the Sweden slice method and the limit equilibrium method were used to calculate and analyze the flowrate, the flow direction and the stability coefficient of the slope under rainfall conditions. The stability of the slope before and after excavation was studied and the area where the water erosion was serious was predicted. The results show that the slope is in a steady state before the excavation when the water level height is equal to the soil thickness under ultimate saturation. After excavation with the slope ratio of 1: 1.75, the slope is also in a stable state. Therefore, the slope excavation construction is safe, but it is necessary to do well drainage and protection work on slope.

Key words: highway engineering, rainfall, road slope, infinite slope, ultimate saturated condition, GIS

摘要： 在人为扰动、地震、降雨等因素中，降雨是滑坡主要的诱发因素。以玉溪新平大戛高速公路边坡为研究工点，结合地质勘测、钻探、物探、现场调查、室内试验、资料收集等数据，采用无限斜坡模型、瑞典条分法及极限平衡法计算分析降雨条件下斜坡的流向流量及其稳定系数，研究斜坡开挖前后的稳定性及预测水流冲刷严重的区域。结果表明：开挖前在水位高度等于土层厚度的极限饱和工况下，斜坡处于稳定状态；开挖后按1:1.75的坡比，斜坡亦处于稳定状态。所以坡体开挖施工是安全的，但需做好坡面排水及防护工作。

关键词: 道路工程, 降雨, 公路边坡, 无限斜坡, 极限饱和, GIS

CLC Number:

U416.1+4

HE Yuqiong1, LI Chunming1, YANG Xinghua2, HUANG Xi1. Stability Analysis of Road Slope Under Rainfall Condition[J]. Journal of Chongqing Jiaotong University(Natural Science), 2018, 37(10): 37-42.

何玉琼1，李春明1，杨兴华2，黄犀1. 降雨条件下公路边坡稳定性分析[J]. 重庆交通大学学报（自然科学版）, 2018, 37(10): 37-42.

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