Citation

Wu GX, Zeng RB, Wang CH, Que Y, Zhang XG. Zhongguo Tiedao Kexue 2006; 27(5): 7-12.

Affiliation

Southwest Jiaotong University, Chengdu 610031, China

Copyright

(Copyright © 2006, Zhongguo Tiedao Kexue Yanjiuyuan)

DOI

unavailable

PMID

unavailable

Abstract

The forming conditions and inducing factors of sand-sliding slope are analyzed. The three necessary conditions to form sand-sliding slope are material conditions, terrain conditions and deposition conditions. The primary inducing factors of sand-sliding are surface water, ground water, stream erosion, dynamic load action, wind load action, freezing-and-thawing action, plant and man-made factors. By carrying through physical and mechanical test of sand-sliding samples, granularity composition of sand-sliding, which mainly made up of medium sand, coarse sand and talus debris are found. In drying state, the internal friction angle of sand-sliding is generally larger than that in natural state. The internal friction angle in natural state is larger than that in saturation state. While its cohesion in natural state is larger than that in saturation state, and the cohesion in saturation state is larger than in drying state. Through model test and theoretical analysis, the paper analyzes how sand grain and water content influence the natural repose angle of sand-sliding by applying double factors variance analysis. Results indicate that both factors have great effect on it. Compared with sand grain factor, water content has larger influence on the natural repose angle of sand-sliding. At last, linear fitting is conducted for four factors, which affect the natural repose angle of sand-sliding slope, like sand grain size, water content, internal repose angle and cohesion by using linear regression theory. The obtained formula can be applied to the estimation of the natural repose angle of sand-sliding slope.