干湿循环作用下非饱和重塑黏土变形特性研究  

Experimental Study of Wetting-Drying Cycle on Deformation Behaviors of Unsaturated Remoulded Clay

作　　者：宋亚亚 朱佩宁 卢廷浩[3,4] 齐昌广[5] Song Yaya;Zhu Peining;Lu Tinghao;Qi Changguang(Guang Dong Tianxin Electric Power Engineering Test Co.,Ltd.,Guangzhou 510663,P.R.China;China Energy Engineering Group Guangdong Electric Power Design Institute Co.,Ltd,Guangzhou 510663,P.R.China;Key Laboratory of Geotechnical Mechanics and Dam Engineering of the Ministry of Education,Hohai University,Nanjing 210098,P.R.China;Institute of Geotechnical Engineering,Hohai University,Nanjing 210098,P.R.China;Faculty of Architectural,Civil Engineering and Environment,Ningbo University,Ningbo,Zhejiang 315211,P.R.China)

机构地区：[1]广东天信电力工程检测有限公司,广州510663 [2]中国能源建设集团广东省电力设计研究院有限公司,广州510663 [3]河海大学岩土力学与堤坝工程教育部重点实验室,南京210098 [4]河海大学岩土工程研究所,南京210098 [5]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《地下空间与工程学报》2022年第4期1219-1225,1240,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家自然科学基金项目(51608351,51508282);浙江省自然科学基金青年基金项目(LY18e080010)。

摘　　要：为了研究了基质吸力与干湿循环对非饱和重塑黏土压缩变形特性的影响,利用最新研制的全自动非饱和土固结仪,在控制基质吸力的条件下进行非饱和土压缩试验。研究结果表明,吸力越大,土体的压缩性越小,屈服应力越大,含水率减小的幅度也越小。试样经历干湿循环后,土体的压缩性增大,屈服应力减小,土体弹性变形的应力范围也减小。非饱和土的压缩变形以孔隙气体的压缩为主,土体中孔隙水的排出处于次要地位。干湿循环对非饱和土变形特性有重要影响,考虑其影响对于实际工程应用是十分必要的。In order to study the deformation rules of unsaturated remoulded clay under matric suction and wetting-drying cycle, compression tests are carried out under controlled matric suction condition with the newest-developed automatic unsaturated soil consolidation instrument. The results show that the larger the suction, the smaller the comprehensibility of soil, the larger the yield stress, and the smaller the decrease of water content. After the dry-wet cycle, the comprehensibility of soil increases, the yield stress decreases, and the stress range of elastic deformation decreases. The compression deformation of unsaturated soil is dominated by the compression of pore gas, and the drainage of pore water is secondary. Wetting-drying cycle has an important influence on deformation behaviors of unsaturated soil and it’s necessary to appreciate this influence in the practical projects.

关 键 词：非饱和土 压缩试验 基质吸力 干湿循环 

分 类 号：TU448[建筑科学—岩土工程]