路基压实粉质黏土水平残余应力估算方法探讨

doi:10.13722/j.cnki.jrme.2020.0277

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Abstract The residual stress of subgrade soil after compaction significantly affects the strength，deformation and stability of the earth structure. The horizontal residual stress of compacted silty clay under lateral constraints was tested by a self-developed apparatus，and the variation law of the horizontal residual stress with the compaction was examined. Considering the nonlinear relationship between the components of soil cohesion and friction c(x)，φ(x)，with the shear displacement x，an analytical model，taking the peak value of cohesion component cm and the corresponding internal friction angle φf as the key parameters，was proposed for the prediction of the horizontal residual stress of compacted subgrade soil based on the Mohr-Coulomb criterion.. Finally，an error analysis was performed on the reliability of the calculated results. The research shows that the nature of the residual stress of compacted subgrade soil derives from the inter-particle locking and the residual stress increases as a piecewise function of the soil compaction. The small-shear deformation state represented by the characteristic values of the soil shear capability cm and φf can better reflect the characteristics of the residual stress state under small-rebound deformation condition when subgrade soil is subjected to compaction and unloading. The experimental data and estimated values from the proposed analytical model are in good agreement with an average error of about 6.30%. The research results facilitate a more in-depth analysis of the stress characteristics and engineering properties of compacted subgrade soil.

Key words： foundation engineering'subgrade'compacted silty clay'horizontal residual stress'estimation method'shear capability

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	Articles by authors
	LIU Hongyang1
	2
	LUO Qiang1
	2
	ZHOU Xin1
	2
	XIE Tao1
	2

Cite this article:

LIU Hongyang1,2,LUO Qiang1, et al. Discussion on estimation method of horizontal residual stress of subgrade compacted silty clay[J]. , 2020, 39(8): 1710-1718.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2020.0277 OR https://rockmech.whrsm.ac.cn/EN/Y2020/V39/I8/1710

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