循环荷载作用下珠海隧道饱和黏土软化试验研究

doi:10.3969/j.issn.1001-5485.2014.05.011

院报 ›› 2014, Vol. 31 ›› Issue (5): 52-55.DOI: 10.3969/j.issn.1001-5485.2014.05.011

循环荷载作用下珠海隧道饱和黏土软化试验研究

孙阳光^1a,1b,高玉峰^1a,1b,刘建民²,曹久亭^1a,1c,黄思杰^1a,1b

1.河海大学 a.岩土力学与堤坝工程教育部重点实验室;b.岩土工程科学研究所;c.安全与防灾工程研究所,南京 210098;
2.山东省地震工程研究院,济南 250021

收稿日期:2013-08-30 修回日期:2014-05-12 出版日期:2014-05-12 发布日期:2014-05-12
作者简介:孙阳光(1988-),男,江苏连云港人,硕士研究生,研究方向为土动力学,(电话)15150573906(电子信箱)syga1200@163.com
基金资助:
国家自然科学基金重大计划培育项目(90815020)

Experimental Study on the Softening of Saturated Clay of Zhuhai Tunnel under Cyclic Loading

SUN Yang-guang^1,2,GAO Yu-feng^1,2,LIU Jian-min³,CAO Jiu-ting^1,4,HUANG Si-jie^1,2

1.Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing 210098, China;
2.Research Institute of Geotechnical Engineering, Hohai University, Nanjing 210098, China;
3.Shandong Earthquake Engineering Research Institute, Jinan 250021,China;
4.Institute of Engineering Safety and Disaster Prevention, Hohai University ,Nanjing 210098,China

Received:2013-08-30 Revised:2014-05-12 Online:2014-05-12 Published:2014-05-12

摘要/Abstract

摘要： 通过对珠海隧道正常固结饱和粉质黏土和淤泥质黏土进行应力控制的循环三轴试验,研究循环荷载作用下土体软化情况。根据软化指数定义,得到土体软化指数曲线;分析了循环荷载过程中土体割线剪切模量发展规律;探讨动应力对土体软化的影响。结果表明:试样在每一循环次数中都存在临界屈服应变ε_p;循环次数较少时,土体刚度软化现象明显,随循环次数逐渐增加,土体刚度软化程度降低甚至不发生刚度软化;相对于加载波形为正弦波而言,半正弦波提高了土体刚度软化程度;动应力的提高增加了土体软化的程度。

关键词: 珠海隧道, 饱和黏土, 循环荷载, 软化指数, 剪切模量

Abstract: To research the softening of clay under cyclic loading, cyclic triaxial tests with stress control were carried out on the normally consolidated saturated silty clay and mucky clay of Zhuhai tunnel. According to the definition of degradation index, the curve of clay’s degradation index was obtained. The development of secant shear modulus in each unload-reload loop was analyzed, and the influence of dynamic stress on the softening of clay was investigated. Results indicated that test sample had critical yield strain ε_p in every cycle and the degradation of stiffness was obvious when the cycle number was small. But with the increase of cycle number, the stiffness degradation reduced or even did not occur. Compared with sine wave, half-sine wave enhanced the degradation of stiffness. The increase of dynamic stress also intensified the softening of clay.

Key words: Zhuhai tunnel, saturated clay, cyclic loading, degradation index, shear modulus

中图分类号:

TU435

孙阳光,高玉峰,刘建民,曹久亭,黄思杰. 循环荷载作用下珠海隧道饱和黏土软化试验研究[J]. 院报, 2014, 31(5): 52-55.

SUN Yang-guang,GAO Yu-feng,LIU Jian-min,CAO Jiu-ting,HUANG Si-jie. Experimental Study on the Softening of Saturated Clay of Zhuhai Tunnel under Cyclic Loading[J]. JOURNAL OF YANGTZE RIVER SCIENTIFIC RESEARCH INSTI, 2014, 31(5): 52-55.

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循环荷载作用下珠海隧道饱和黏土软化试验研究

Experimental Study on the Softening of Saturated Clay of Zhuhai Tunnel under Cyclic Loading

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