基于随机场理论的基坑开挖地表及围护墙变形分析

doi:10.13722/j.cnki.jrme.2021.0678

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Abstract Based on the small strain model，the random field theory is combined with the finite analysis method to study the influence of the spatial variability of stiffness parameters on the surface and retaining wall deformation induced by braced excavation. A series of isotropy random field models of clay stiffness are generated by Covariance Matrix Decomposition method. With Monte-Carlo framework，the paper analyzes the influence of coefficients of variation and scales of fluctuation on the surface settlement and retaining wall deflection. The results show that the spatial variability of stiffness parameters in clay has an important influence on surface settlement and retaining wall deflection. The surface settlement and the maximum deformation ratio are the most dispersed when the scales of fluctuation is close to the excavation size while similar conclusion has not been drawn in retaining wall deflection. Compared with the corresponding deterministic results，the mean values of maximum surface settlement and maximum retaining wall deflection show different results in the stochastic analysis because of the dominant effect of low stiffness. With the help of probability statistics method，the paper studies the possibility of surface settlement and retaining wall deflection exceeding the monitoring control values，which can provide a reference for the safety warning for the maximum deformation induced by braced excavation before construction.

Key words： foundation engineering the small strain model spatial variability braced excavation in clay surface settlement retaining wall deflection probabilistic statistical analysis

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	YI Shun1
	2
	3
	4
	LIN Weining5
	CHEN Jian1
	2
	3
	4
	HUANG Juehao1
	2
	3
	4
	LI Jianbin6
	WU Jiaming7
	8

Cite this article:

YI Shun1,2,3, et al. Deformation analysis of surface and retaining wall induced by braced excavation based on random field theory[J]. , 2021, 40(S2): 3389-3398.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0678 OR https://rockmech.whrsm.ac.cn/EN/Y2021/V40/IS2/3389

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