In-situ Mechanical Property and Mechanism Analysis of Shallow Expansive Soil under the Influence of Water Content and Fissures

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-23 DOI:10.1007/s12205-024-1440-6

Xiaoqian Luo, Lingwei Kong, Junbiao Yan, Zhiao Gao, Shengkui Tian

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Abstract

The mechanical properties of shallow expansive soil are crucial to expansive soil engineering. However, few effective test methods have been available to measure the in-situ mechanical properties of shallow expansive soil. This paper attempts to test the effects of water content and fissures on the mechanical properties of shallow expansive soil under a natural state by in-situ CBR and resilience modulus tests. The evolution characteristics of shrinkage fissures in expansive soil were recorded and observed. The fissure connectivity coefficient is used to express the degree of fissure development and the integrity of soil structure. The CBR strength and resilience modulus of expansive soil increase first and then decrease with the decrease of water content and the increase of fissure development degree, and reach the peak near the optimal water content. It is effective to use the inverse hyperbolic sine function to fit the relationship between soil mechanical parameters, water content, and fissure connectivity coefficient. When the water content is higher, the influence of water content on soil mechanical properties is great. When the water content is lower, fissures are more developed, and the influence of fissures on soil mechanical properties is dominant.

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含水量和裂隙影响下浅层膨胀土的原位力学性能和机理分析

浅层膨胀土的力学特性对膨胀土工程至关重要。然而，目前很少有有效的测试方法来测量浅层膨胀土的原位力学性质。本文试图通过原位 CBR 和回弹模量测试，检验含水量和裂隙对自然状态下浅层膨胀土力学性质的影响。记录并观察了膨胀土中收缩裂隙的演变特征。裂隙连通系数用于表示裂隙发育程度和土体结构的完整性。随着含水量的降低和裂隙发育程度的增加，膨胀土的 CBR 强度和回弹模量先增大后减小，并在最佳含水量附近达到峰值。利用反双曲线正弦函数拟合土力学参数、含水量和裂隙连通系数之间的关系是有效的。含水量越高，含水量对土壤力学性能的影响越大。含水量较低时，裂隙较发育，裂隙对土壤力学性质的影响占主导地位。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.