|Table of Contents|

Study on Slope Stability of Granite Residual Soil Cutting Excavation with Rainfall(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2012年第04期
Page:
88-94
Research Field:
工程地质
Publishing date:

Info

Title:
Study on Slope Stability of Granite Residual Soil Cutting Excavation with Rainfall
Author(s):
DENG Tong-fa1; 2;  GUI Yong3;  LUO Si-hai1;  ZHOU Jun-ping4
1. School of Architectural and Surveying and Mapping Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China; 2. School of Civil Engineering, Guangzhou University, Guangzhou 510006,Guangdong, China; 3. School of Applied Science, Jiangxi University of Science and Technology, Ganzhou341000, Jiangxi, China; 4. Ganzhou Expressway Co., Ltd., Ganzhou 341000, Jiangxi, China
Keywords:
slope;  stability;  landslide;  seepage;  matric suction;  limit equilibrium method;  finite element method;  residual soil
PACS:
P642; U416.1+4
DOI:
-
Abstract:
Based on saturated-unsaturated seepage theory and unsaturated soil shear strength theory, a typical high cutting excavation slope in Jiangxi Liren-Longnan Section of Daqing-Guangzhou Expressway was selected, the model was built by the simulation software GeoStudio, and the shape and mechanism of slope instability of granite residual soil cutting excavation with rainfall were studied by the means of limit equilibrium method and finite element method of rainfall infiltration. The results showed that groundwater table rose from the bottom of slope and “small arc” instability easily happened in the bottom with rainfall; the increase of volumetric moisture content deceased the matric suction, and thereby deceased soil strength and safety factor of slope, and the decreases of matric suction and safety factor were synchronized; rainfall intensity had significant effect on safety factor of slope, safety factor decreased slowly with light rain and decreased quickly with rainstorm, and the most decease was 24.4%; matric suction of slide surface mostly lost with heavy rain, slope instability happened from whole to local instability and from deep to shallow instability, so that the strong rainfall was main extrinsic factor of shallow landslide.

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Last Update: 2012-12-20