冻压条件下冻融软土孔隙特征与动力特性分析

doi:10.13722/j.cnki.jrme.2020.0496

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Abstract The construction of subway connection channels in Hangzhou is mostly carried out by freezing method，which leads to uneven settlement during operation. In the whole range of frozen soil，the freezing conditions change with the relative relationship between the soil and the freezing pipe. Soil samples frozen under different freezing conditions were obtained using sample making instrument invented by the authors. Nuclear magnetic resonance(NMR) tests were performed to study the variation of pore size distribution curve of freezing-thawing soil under different freezing conditions, and the pore pressure，strain and stiffness of the samples were deeply explored combined with dynamic triaxial test. A concise pore pressure prediction model of soft clay under artificial freezing with clear physical parameters was established. The results show that, with decreasing the freezing temperature，frost-heaving brings about worse destruction of the soil structure. During freezing-thawing period，the confining pressure can effectively compact the framework structure of the soil and reduce the deformation under cyclic loads. The limit value of the pore pressure is linearly correlated with the area of medium pores of pore size distribution curve.

Key words： soil mechanics artificial ground freezing(AGF) pore size distribution pore pressure freezing- thawing confining pressure cyclic loading

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	Articles by authors
	KONG Bowen1
	2
	DING Zhi3
	HE Shaoheng1
	2
	ZHUANG Jiahuang4

Cite this article:

KONG Bowen1,2,DING Zhi3, et al. Experimental study on pore features and dynamic behaviors of soft clay under different confine pressures during freezing[J]. , 2020, 39(11): 2328-2340.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0496 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I11/2328

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