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On-line Access: 2025-01-02

Received: 2024-01-12

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Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Hanqing CHEN

https://orcid.org/0000-0002-2115-3538

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Journal of Zhejiang University SCIENCE A 2024 Vol.25 No.12 P.974-990

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


Effect of dry–wet cycles 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):  Underground Polis Academy, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen518060, China; more

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

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


Xin LI, Hanqing CHEN, Dong SU, Xiangsheng CHEN, Xiang SHEN. Effect of dry–wet cycles on the mechanical properties and microscopic characteristics of fine breccia soil from karst areas[J]. Journal of Zhejiang University Science A, 2024, 25(12): 974-990.

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A1 - Xiang SHEN
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Abstract: 
The quality of the railway subgrade is directly related to the fill soil structure, which, in turn, is determined by the local physical and chemical environment. A karst environment, with its frequent rainfall, promotes the dissolution of soluble rocks and underground transportation of solutes, altering the soil structure and performance. To investigate these alterations, we analyzed the properties of underground soil from highly developed karst areas. Fine breccia soil from karst regions was tested to assess its macroscopic mechanical properties and microstructural features, for differing initial water contents and compaction levels. Samples were subjected to simulated rainfall conditions through dry–;wet cycles, and then underwent triaxial shear and electron microscopy tests. From these data, a micro-to-macro correlation model and a normalization model were developed. The findings suggest that the resistance of fine angular breccia soil to degradation during dry–;wet cycles can be enhanced through high-pressure compaction and by maintaining a moisture content close to 15.6%. Increasing the degree of compaction improves the particle size distribution and the density of the soil skeleton. This is advantageous for minimizing soil particle erosion, thereby ensuring the strong performance of railway subgrades in karst areas with frequent rainfall.

干湿循环对岩溶地区细角砾土力学性能和微观特征的影响

作者:李鑫1,2,3,陈汉青1,2,3,苏栋1,2,3,陈湘生1,2,3,沈翔1,2,3
机构:1深圳大学,土木与交通工程学院,未来地下城市研究院,中国深圳,518060;2深圳大学,滨海城市韧性基础设施教育部重点实验室,中国深圳,518060;3深圳市地铁地下车站绿色高效智能建造重点实验室,中国深圳,518060
目的:在干湿循环的过程中,岩溶区细角砾土的微观性能与宏观力学性能会发生变化,进而导致路基性能的改变。本文旨在探讨不同干湿循环次数后,土体的微观特征(颗粒组成和孔隙结构等)及宏观力学性能(应力-应变关系和破坏强度等)在不同初始含水率和压实度等条件下的变化趋势,研究干湿循环作用下土体力学性能与微观特征间的关联,并提出岩溶区细角砾土在路基中的使用建议。
创新点:1.基于Konder应力-应变归一化方程,引入干湿循环强度残余比概念,推导出不同环境变量下细角砾土应力-应变关系表达式;2.通过微观特征数据提取与宏观力学试验,建立了干湿循环作用下细角砾土力学性能与微观特征间的相互关联。
方法:1.通过试验分析,得到不同压实度、初始含水率和围压下干湿循环对岩溶区细角砾土宏观力学性能的影响规律;2.通过理论推导,构建引入干湿循环强度残余比概念的细角砾土应力-应变关系归一化表达式;3.通过电镜扫描试验和图像数据提取技术,得到不同干湿循环次数和不同条件下岩溶区细角砾土的微观结构及相关数据,并与宏观力学性能相互关联。
结论:1.岩溶区细角砾土的受力变形呈应力硬化型,因此高压实度和略低于最佳含水率的土壤更能抵抗干湿循环的劣化效应;2.提高含水率使土颗粒的棱角边界变得模糊,颗粒间大夹角的嵌挤骨架减少,且部分大骨架颗粒崩解为小颗粒,进而导致其力学性能的减弱;3.以岩溶区细角砾土为路基填料时,建议采用大压实度和略小于最佳含水率的方法进行填筑。

关键词:岩溶地质;微观和宏观特性;路基性能;干湿循环

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

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