|Table of Contents|

Microscopic analysis of improved weak expansive soil under different consolidation conditions(PDF)

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

Issue:
2023年04期
Page:
163-170
Research Field:
岩土工程
Publishing date:

Info

Title:
Microscopic analysis of improved weak expansive soil under different consolidation conditions
Author(s):
WANG Huan;  CAO Sujuan;  LI Baobao
(School of Civil and Architectural Engineering, Henan University, Kaifeng 475004, Henan, China)
Keywords:
improved expansive soil;  silty sand;  microscopic characteristic;  fractal dimension
PACS:
TU443
DOI:
10.19815/j.jace.2021.08038
Abstract:
In order to study the improvement effect of silty sand on weak expansive soil in Xinxiang area, the consolidation compression characteristics and microstructure characteristics of expansive soil and silty sand modified expansive soil were analyzed by consolidation test and environmental scanning electron microscope test. The microstructure of expansive soil and modified soil under different consolidation pressures was qualitatively analyzed. The fractal variation characteristics of soil pores were quantitatively analyzed by IPP and MATLAB software. The results show that the compression characteristics of soil are mainly related to the arrangement form, compactness and pore distribution of particles in the soil. With the gradual increase of consolidation pressure, the void ratio and compression coefficient of the two kinds of soil samples show a decreasing trend, and the void ratio of the improved expansive soil is less than that of the expansive soil under the same consolidation pressure, while the compression coefficient is greater than that of the expansive soil, which indicates that the structural compressibility of the improved expansive soil is better than that of the expansive soil. Through the comparative analysis of the microstructure under different test conditions, it is found that the pore distribution of two kinds of soil samples has obvious fractal characteristics. Within a certain range, with the gradual increase of consolidation pressure, the pore fractal dimension of expansive soil and improved expansive soil increases gradually, the fractal dimension of improved expansive soil is greater than that of expansive soil, but the variation range is less than that of expansive soil, which indicates that the pore structure distribution of improved expansive soil is complex and the structure is more stable. The silt sand in the Yellow River flooding area can significantly improve the consolidation and compression characteristics of weak expansive soil in Xinxiang area.

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Last Update: 2023-07-01