Seismic deformation behaviors of the soft clay after freezing-thawing

被引：3

作者：

Cui, Zhen-Dong ^{[1
]}

Huang, Meng -Hui ^{[1
]}

Hou, Chen-Yu ^{[1
]}

Yuan, Li ^{[1
]}

机构：

[1] China Univ Min & Technol, Sch Mech & Civil Engn, State Key Lab Intelligent Construct & Hlth Operat, Xuzhou 221116, Jiangsu, Peoples R China

来源：

GEOMECHANICS AND ENGINEERING | 2023年 / 34卷 / 03期

关键词：

deformation mode; freezing-thawing; seismic load; soft clay;

D O I：

10.12989/gae.2023.34.3.303

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

With the development and utilization of urban underground space, the artificial ground freezing technology has been widely used in the construction of underground engineering in soft soil areas. The mechanical properties of soft clay changed greatly after freezing and thawing, which affected the seismic performance of underground structures. In this paper, a series of triaxial tests were carried out to study the dynamic response of the freezing-thawing clay under the seismic load considering different dynamic stress amplitudes and different confining pressures. The reduction factor of dynamic shear stress was determined to correct the amplitude of the seismic load. The deformation development mode, the stress-strain relationship and the energy dissipation behavior of the soft clay under the seismic load were analyzed. An empirical model for predicting accumulative plastic strain was proposed and validated considering the loading times, the confining pressures and the dynamic stress amplitudes. The relevant research results can provide a theoretical reference to the seismic design of underground structures in soft clay areas.

引用

页码：303 / 316

页数：14

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