地铁列车荷载下冻融土刚度软化试验研究

doi:10.13722/j.cnki.jrme.2017.1276

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Abstract Freezing technology is frequently used in the construction of connection tunnel between metro tunnels and in the operation of shield break-in and break-out. The freezing-thawing action has the negative effect on the stiffness of soil. When the subway comes into service，its safety could be undermined under metro loading. In this paper，the undrained dynamic triaxial test was conducted in laboratory to simulate the dynamic stress state of frozen-thawed soil under metro loading. The variation of soil stiffness was obtained and a stiffness softening model was established. A piecewise function was found to describe the stiffness softening of frozen-thawed soil under cyclic loading. When the metro loading is firstly loaded on the sample，there is a semi logarithmic correlation between the stiffness G and the loading times N. When the value of lnN reaches to 8.25 to 9.5，a turning point of the softening curve appears，and the stiffness declines little after this turning point. The freezing-thawing operation also accelerates the stiffness softening process under the metro loading. The stiffness can be increased by raising the consolidation degree. The higher the consolidation degree of the frozen-thawed soil is，the lower the stiffness loss ratio and softening speed are.

Key words： soil mechanics frozen-thawed soil subway loading stiffness consolidation freezing temperature

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	DING Zhi
	WEI Xinjiang
	ZHUANG Jiahuang
	CAI Zhijin

Cite this article:

DING Zhi,WEI Xinjiang,ZHUANG Jiahuang, et al. Experimental study on stiffness softening of frozen-thawed soil under subway loading[J]. , 2018, 37(4): 987-995.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2017.1276 OR https://rockmech.whrsm.ac.cn/EN/Y2018/V37/I4/987

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