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Journal of Zhejiang University SCIENCE A 1998 Vol.-1 No.-1 P.

http://doi.org/10.1631/jzus.A2400018


Effects of dry–wet cycling on the mechanical properties and microscopic characteristics of fine breccia soil from karst areas


Author(s):  Xin LI, Hanqing CHEN, Dong SU, Xiangsheng CHEN, Xiang SHEN

Affiliation(s):  College of Civil and Transportation Engineering, Underground Polis Academy, Shenzhen University, Shenzhen 518060, China; more

Corresponding email(s):   hanqingchen@suz.edu.cn

Key Words:  Karst area, Micro–, macro properties, Roadbed performance, Dry–, wet cycles


Xin LI, Hanqing CHEN, Dong SU, Xiangsheng CHEN, Xiang SHEN. Effects of dry–wet cycling on the mechanical properties and microscopic characteristics of fine breccia soil from karst areas[J]. Journal of Zhejiang University Science A, 1998, -1(-1): .

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%T Effects of dry–wet cycling on the mechanical properties and microscopic characteristics of fine breccia soil from karst areas
%A Xin LI
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%A Dong SU
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%A Xiang SHEN
%J Journal of Zhejiang University SCIENCE A
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%I Zhejiang University Press & Springer
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A1 - Xiang SHEN
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DOI - 10.1631/jzus.A2400018


Abstract: 
The quality of roadbed engineering is directly related to the fill soil structure, which, in turn, is determined by the physical and chemical environment of a given area. The karst water environment, with frequent rainfall events, promotes the dissolution of soluble rocks and transportation of underground substances, which alters the soil structure and performance. Therefore, we aimed to analyze the properties of underground soil from heavily developed karst areas. Fine breccia soil from karst regions was tested to assess its macroscopic mechanical properties and microstructural features at various initial water contents and compaction levels. Samples were subjected to simulated rainfall conditions, undergoing dry–;wet cycling, followed by triaxial shear testing and electron microscopy examinations. From the data obtained, a micro-to-macro correlation and normalization model were developed. The findings suggest that the resistance of fine angular breccia soil to degradation upon to dry–;wet cycling can be enhanced by high-pressure compaction and maintaining a moisture content close to the optimal level. Increasing the degree of compaction improves the particle size distribution and skeleton density of the soil. This is advantageous for minimizing soil particle erosion, thereby ensuring the robust performance of roadbeds in karst areas with frequent rainfall events.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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