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Physical and Mechanical Properties and Microstructures of Slip Soil of Loess Bedrock Contact Landslide(PDF)

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

Issue:
2017年第03期
Page:
450-458
Research Field:
工程地质
Publishing date:

Info

Title:
Physical and Mechanical Properties and Microstructures of Slip Soil of Loess Bedrock Contact Landslide
Author(s):
WANG Lei ZHAO Fa-suo CHENG Xiao-hui QI Di WANG Rui
1. School of Engineering and Geomatics, Chang’an University, Xi’an 710064, Shaanxi, China; 2. Xi’an Railway Survey and Design Institute Co., Ltd, Xi’an 710054, Shaanxi, China; 3. School of Civil Engineering, Chang’an University, Xi’an 710061, Shaanxi, China
Keywords:
loess landslide slip soil remolded soil shearing test X-ray diffraction physical mechanics microstructure
PACS:
P642.1
DOI:
-
Abstract:
Shear strength and microstructure characteristics of slip soil are important for the slope stability. Taking Erzhuangke landslide in Yanan area of Shaanxi as an example, the physical and mechanical properties and microstructures of slip soil of loess bedrock contact landslide were discussed based on the shear test, scanning electron microscope (SEM) and X-ray diffractometer. The shear strength parameters of slip soil under the condition of different moistures and dry densities were obtained through the shear test, and the correlation between the shear strength parameters, moisture and dry density were discussed. According to the mineral composition, the microstructure characteristics of slip soil under the condition of different dry densities and vertical pressures were analyzed. The results show that the shear strength parameters of soil samples increase with the decrease of moisture and the increase of dry density; the relationships of cohesion, internal friction angle with moisture are negative exponent and negative linear, respectively; the relationships of cohesion, internal friction angle with dry density are positive linear; with the increase of vertical pressure, all of the dispersion indexes of particle, and the average shape coefficients, quantitative probabilistic entropy and orientation fractal dimension of porosity (particle) decease; with the increase of dry density, both of quantitative probabilistic entropy and orientation fractal dimension of particle increase.

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Last Update: 2017-06-05