深基坑内支撑拆除时支护结构水平位移计算方法

doi:10.13722/j.cnki.jrme.2021.0474

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Abstract The dismantling of the inner support in deep foundation pit caused the deformation of the retaining structures，which has a significant impact on the surrounding environment. The space curve differential equations for retaining structures within each independent coor-dinnates system were proposed by applying the Winkler elastic foundation beam theory. And the non-limit equilibrium state of soil pressure of retaining structures was considered，and the reduction coefficient μ was uesd to quantitatively describe load reduction in horizontal direction during the transformation of basement structural plate and inner support. Then the deformation of retaining structures by this numerical method were solved. And taking the deep excavation project of Xiaguangli building of Chaoyang District and Shenzhen Pingan building as a background，the horizontal deformation of the retaining structures in different stages of the dismantling inner support was calculated，and the influence of the process of the dismantling inner support on the horizontal displacement of the retaining structures was analyzed. The results show that the calculated values of this method are close to the site monitoring date. During the process of dismantling inner support，the horizontal displacement of the retaining structures is approximately a parabola like curve with the maximum point moving upward. The increment of horizontal displacement is mainly concentrated above 1/2H depth of retaining structures. The value range of reduction coefficient from 0.1 to 0.3 is reasonable. The influence of value on the deformation of retaining structures decreases with the increase of depth. The horizontal displacement of retaining structures below excavation depth is not affected by value.

Key words： foundation pit engineering deep foundation elastic foundation beam inner support demolition horizontal displacement field monitoring

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	Articles by authors
	LI Tao1
	YANG Yiwei1
	ZHOU Yuqi2
	LIU Bo1
	3
	ZHENG Qun2
	ZHENG Yixue1

Cite this article:

LI Tao1,YANG Yiwei1,ZHOU Yuqi2, et al. Analytical solution of horizontal displacement of retaining structures in deep foundation pit during dismantling inner support[J]. , 2022, 41(S1): 3021-3032.

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https://rockmech.whrsm.ac.cn/EN/10.13722/j.cnki.jrme.2021.0474 OR https://rockmech.whrsm.ac.cn/EN/Y2022/V41/IS1/3021

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