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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摘要深基坑内支撑拆除导致支护结构产生较大变形，对周围环境影响显著。基于Winkler弹性地基梁理论，考虑支护结构土压力的非极限平衡状态，并引入折减系数定量描述地下室结构板与内支撑转换过程中的水平荷载损失量，应用分段独立坐标法推导支护结构的挠度微分方程，采用数值方法求得支护结构的水平位移值。以北京朝阳区霞光里深基坑及深圳平安大厦深基坑工程为背景，计算不同拆撑阶段支护结构的水平变形量，并分析拆撑过程对支护结构水平位移的影响。结果表明：该方法的计算值与实测值较为吻合；内支撑拆除过程中，支护结构水平位移曲线近似为最大值点不断上移的类抛物线，水平位移增量主要集中在支护结构1/2H以上；折减系数取值范围为0.1～0.3，值对支护结构变形的影响随着深度的增大而逐渐降低，开挖面以下支护结构水平位移值基本不受值影响。

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	李涛1
	杨依伟1
	周予启2
	刘波1
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	郑群2
	郑逸雪1

关键词 ：基坑工程, 深基坑, 弹性地基梁, 内支撑拆除, 水平位移, 现场实测

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

引用本文:

李涛1，杨依伟1，周予启2，刘波1，3，郑群2，郑逸雪1. 深基坑内支撑拆除时支护结构水平位移计算方法[J]. 岩石力学与工程学报, 2022, 41(S1): 3021-3032.
LI Tao1，YANG Yiwei1，ZHOU Yuqi2，LIU Bo1，3，ZHENG Qun2，ZHENG Yixue1. Analytical solution of horizontal displacement of retaining structures in deep foundation pit during dismantling inner support. , 2022, 41(S1): 3021-3032.

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http://rockmech.whrsm.ac.cn/CN/10.13722/j.cnki.jrme.2021.0474 或 http://rockmech.whrsm.ac.cn/CN/Y2022/V41/IS1/3021

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