非饱和黄土初始剪切模量与孔径分布试验研究

徐洁; 赵文博; 陈永辉; 陆嘉楠

doi:10.11779/CJGE2017S1045

非饱和黄土初始剪切模量与孔径分布试验研究 English Version

徐洁^1,2,3,
赵文博^1,3,
陈永辉^1,2,3,
陆嘉楠^1,3

1. 河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京 210098;
2. 江苏省岩土工程技术工程研究中心（河海大学）,江苏南京 210098;
3. 河海大学岩土工程研究所,江苏南京 210098

基金项目: 国家自然科学基金项目（51308190）; 江苏省博士后基金项; 目; 江苏省高校“青蓝工程”项目

详细信息

作者简介:
徐洁(1982-),女,浙江永嘉人,讲师,主要从事非饱和土力学、环境土工等方面的研究。E-mail:cexujie@gmail.com。

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出版历程
- 收稿日期: 2016-11-27
- 发布日期: 2017-11-19

Experimental study on initial shear modulus and pore-size distribution of unsaturated loess

XU Jie^1,2,3,
ZHAO Wen-bo^1,3,
CHEN Yong-hui^1,2,3,
LU Jia-nan^1,3

1. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;
2. Jiangsu Research Center for Geotechnical Engineering Technology, Hohai University, Nanjing 210098, China;
3. Geotechnical Research Institute, Hohai University, Nanjing 210098, China

摘要

摘要: 土的初始剪切模量G₀是地震、爆破响应中一个非常重要的土动力学参数,对预测地表沉降、土工建筑物周围土体变形等具有重要作用。黄土在中国及世界各地分布广泛,且现场常处于非饱和状态。对非饱和黄土的压实试样进行了吸力控制的共振柱试验以及压汞试验,研究非饱和黄土初始剪切模量G₀与孔径分布的关系。试验表明：干湿循环过程中,试样的G₀随吸力的增大而增大,再随吸力的减小而减小。主要原因是试样内孔隙密度最大的孔径大小随吸力的增大而减小,试样内大孔隙减少,小孔隙增多,导致毛细水所占比例增加,土颗粒接触更加紧密。同一吸力作用下,湿润段试样的小孔隙比例比干燥段大,故毛细水作用更显著,从而湿润段试样的G₀大于干燥段。
- 非饱和黄土 /
- 初始剪切模量 /
- 孔径分布 /
- 吸力 /
- 干湿循环
Abstract: The initial shear modulus of soil G₀ is an important parameter for predicting the ground deformation and dynamic response of many earth structures subjected to earthquake or explosion. Loess is spread all over the world and is usually in unsaturated state in the field. The principal objectives of this research are to investigate the initial shear modulus and pore-size distribution of an unsaturated loess by using the suction controlled resonant column tests and mercury intrusion porosimetry tests. The test results show that G₀ increases with the increasing suction during drying and decreases with suction during wetting. The main reason is that the amount of large pores decreases while that of small pores increases during drying. As a result, the amount of meniscus water increases, which holds soil particles more tightly. Under the same suction, the amount of small pores is larger for specimens during wetting than that during drying, which results in stronger meniscus water effect and thus G₀ during wetting is higher than that during drying.
- unsaturated loess /
- initial shear modulus /
- pore-size distribution /
- suction /
- drying-wetting

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参考文献(13)

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文章访问数: 317
HTML全文浏览量: 7
PDF下载量: 198
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非饱和黄土初始剪切模量与孔径分布试验研究 English Version

作者简介: 徐洁(1982-),女,浙江永嘉人,讲师,主要从事非饱和土力学、环境土工等方面的研究。E-mail:cexujie@gmail.com。

计量

出版历程

Experimental study on initial shear modulus and pore-size distribution of unsaturated loess

计量

出版历程

目录

作者简介:
徐洁(1982-),女,浙江永嘉人,讲师,主要从事非饱和土力学、环境土工等方面的研究。E-mail:cexujie@gmail.com。