|Table of Contents|

Study on Reliability for Loess High Slopes in Xiangning-Jixian Area of Shanxi Province(PDF)

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

Issue:
2012年第02期
Page:
81-89
Research Field:
工程地质
Publishing date:

Info

Title:
Study on Reliability for Loess High Slopes in Xiangning-Jixian Area of Shanxi Province
Author(s):
LI Ping;  ZHAO Ji-fei;  LI Tong-lu
School of Geological Engineering and Surveying, Chang'an University, Xi'an 710054, Shaanxi, China
Keywords:
loess;  slope;  reliability;  Monte-Carlo Method;  coefficient of variation;  failure probability;  stability coefficient;  limit state
PACS:
P642.13+1; TU413.6+2
DOI:
-
Abstract:
The sections of 7 representative natural limit state loess high slopes in Xiangning-Jixian Area of Shanxi Province were measured, and the strata structure models were built; the optimal physical and mechanical parameters of loess in the area were selected, and the variability of cohesions and internal frictional angle of loess in different strata ages from 10 typical sites was analyzed; 6 typical groups of coefficient of variation for strength parameters were selected, and the reliability was simulated by Monte-Carlo Method, and the stability of loess slopes was evaluated. The results showed that the variation of failure probability coincided with height of slope, the failure probability of slope with middle height(49.8 m)was high, but higher and lower slopeswere low; the failure probability was sensitive to height and gradient of slope when the coefficient of variation was small, but it was insensitive when the coefficient was large; when the height and gradient of slope were constant and the coefficients of variation of strength parameters were small, stability coefficient was basically constant; but when the coefficients of variation exceeded a certain limit, stability coefficient increased with the coefficients of variation, and there was nonlinear correlativity between them; the loess slopes in the area were basically stable, but the maximum failure probability was 69.3%, the average was 21.1%, and the proportion of slopes with 20%-30% failure probability was 33.3%, and the proportion with failure probability(>30%)was 14.3%; reliability indexes were -0.5-8.5, and the proportion of slopes with the indexes(<2.7)was 88.1%; for the loess high slope with about 50 m height, if 30% was taken as the acceptable failure probability, the gradient of slope would decrease to less than 45°, and if the acceptable failure probability was less than 10%, the gradient would be lower than 34°.

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Last Update: 2012-06-20