|Table of Contents|

One-dimensional compression model of collapsible loess and its application(PDF)

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

Issue:
2025年02期
Page:
190-200
Research Field:
岩土工程
Publishing date:

Info

Title:
One-dimensional compression model of collapsible loess and its application
Author(s):
WEN Bo1; 2;  WENG Xiaolin1; 2;  HOU Lele1; 2;  GENG Yingqiao1; 2;  CHENG Zhijie1; 2
(1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China; 2. Key Laboratory for Special Area Highway Engineering of Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China)
Keywords:
collapsible loess;  moisture content;  one-dimensional compression;  disturbed state concept
PACS:
TU432
DOI:
10.19815/j.jace.2023.03061
Abstract:
Taking undisturbed loess and remolded loess with different initial moisture contents as the research objects, the deformation and collapsibility characteristics of collapsible loess under different initial moisture contents were deeply explored through lateral compression tests and microscopic electron microscopy scanning tests. Based on the disturbance state theory, a disturbed state concept(DSC)model was established to predict the one-dimensional compression behavior of undisturbed loess under different initial moisture contents, taking into account the structural composition of collapsible loess and the influence of initial moisture content. The Weinan loess was selected to compare its indoor test results with the predicted results. A DSC model-based prediction method for the collapsibility coefficient and site deformation of collapsible loess was proposed, and the rationality and practicality of the model were verified by comparing prediction results with indoor test results. The results show that the compression curve of undisturbed loess has obvious turning points, while the compression curve of remolded loess does not show obvious turning points and is approximately represented by a tilted straight line. The pore structure of remolded loess is more dense than that of undisturbed loess. The initial moisture content has a significant impact on the deformation characteristics of both undisturbed loess and remolded loess, and the higher the initial moisture content, the lower the yield stress of loess. The initial moisture content has a significant impact on the microstructure of both undisturbed and remolded loess. As the initial moisture content of the sample increases, the internal hollow structure of the soil gradually breaks down and the collapsibility is gradually eliminated.

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Last Update: 2025-03-20