软弱夹层对水泥土单轴压缩影响研究

doi:10.13722/j.cnki.jrme.2019.0651

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Abstract In order to explore the influence of the thickness ratio of weak interlayer on uniaxial compression parameters and failure modes of cement soil samples，cement soil samples with a single interlayer of different thickness ratios were prepared by using the sample preparation method of single interlayer salt rock，and uniaxial compression tests at room temperature and frozen state were carried out. The uniaxial compression of cemented soil was simulated by PFC2D，and the micromechanical response mechanism of the specimen after loading was analyzed. An uniaxial compression damage constitutive model of cement soil under the coupling of weak interlayer and load was established，and the influence of the thickness ratio of the weak interlayer on the evolution of damage variables was investigated. The results show that the uniaxial compressive strength and elastic modulus of cement soil samples decrease negatively exponentially with increasing the thickness ratio of the weak interlayer at room temperature or frozen state，and that the failure strain changes parabolically with enhancing the thickness ratio of the weak interlayer. The uniaxial compression mechanical parameters and failure modes of the cement soil samples with different weak interlayer thickness ratios obtained by PFC2D simulation are in good agreement with the results of laboratory tests. Both numerical simulations and laboratory tests show that the thickness of the weak interlayer has a great influence on the failure mode of the sample. The developed damage constitutive model of weak interlayer and load coupling can well describe the stress-strain relationship of cement soil samples with a weak interlayer under uniaxial compression load at room temperature or freezing state. The weak interlayer makes the damage degree of the specimens obviously different in the process of deformation. The larger the thickness ratio of the weak interlayer is，the larger the total damage variable of the sample will be when the axial strain is small，and more quickly the sample breaks.

Key words： soil mechanics cement soil weak interlayer microscopic characteristics damage constitutive model

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	Articles by authors
	CHEN Xin1
	2
	ZHANG Ze1
	LI Dongqing1
	ZHANG Dongming3
	FANG Deyang3

Cite this article:

CHEN Xin1,2,ZHANG Ze1, et al. Study on the influence of weak interlayer on uniaxial compression behaviors of cement soils[J]. , 2020, 39(2): 398-412.

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http://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2019.0651 OR http://rockmech.whrsm.ac.cn/EN/Y2020/V39/I2/398

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