|Table of Contents|

Influence of Dry-wet Cycle on Crack and Strength of Silty Sand Improved Expansive Soil(PDF)

《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

Issue:
2022年05期
Page:
213-221
Research Field:
基础工程
Publishing date:

Info

Title:
Influence of Dry-wet Cycle on Crack and Strength of Silty Sand Improved Expansive Soil
Author(s):
WANG Huan;  CAO Yi-kang;  REN Jun-xi
(School of Civil Engineering and Architecture, Henan University, Kaifeng 475004, Henan, China)
Keywords:
improved expansive soil;  dry-wet cycle;  moisture content;  shear strength;  crack rate
PACS:
TU443
DOI:
10.19815/j.jace.2021.07006
Abstract:
In order to explore the influence law of crack development and strength of silty sand improved expansive soil subgrade in the Yellow River flood area under the action of dry-wet cycle, the indoor dry-wet cycle tests were designed and carried out. Direct shear tests of improved expansive soil under four different moisture contents of 11%, 13%, 15% and 17% were carried out respectively. Then, the image processing technology developed by MATLAB was used to quantitatively analyze the cracks of soil samples after dry-wet cycle, and the relationship between the crack rate and shear strength of improved expansive soil was discussed. The results show that the crack rate, cohesion and internal friction angle of the improved expansive soil decreases gradually with the increase of water content. When the moisture content is constant, the development of cracks increases with the increase of dry-wet cycles, and the cohesion and internal friction angle of improved expansive soil decrease with the increase of crack rate. When the moisture content is 11%, the first two dry-wet cycles lead to the rapid development of cracks in the improved expansive soil. The crack rate curve is steep and the cohesion decreases rapidly, but the internal friction angle changes little. The correlation coefficient between the crack rate and the cohesion of the improved expansive soil reaches 0.95. When the moisture content is 17%, although the cracks of the improved expansive soil develop slowly under the first four dry-wet cycles, the crack rate increases rapidly. After the four dry-wet cycles, the growth of the crack rate becomes insignificant, the crack rate curve is relatively flat, and the decreases of cohesion and internal friction angle are less. The correlation coefficient between the crack rate and cohesion of the improved expansive soil is only 0.70.

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Last Update: 2022-09-30