A method for predicting deformation field of deep foundation pit considering spatial effect

Lijuan Luo, Yunxin Zheng, Rui Wang, Xiang Ren, Yonghui Zhang
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Abstract

Urban underground spaces have experienced significant development and utilization due to the rapid progress of urban construction and continuous advancements in construction technology. The number of foundation-pit projects immediately adjacent to buildings, structures, and pipelines has been increasing. Ensuring the safety of construction and surrounding facilities, it is essential to predict deformation caused by foundation pit excavations. In this study, a simple calculation method was proposed for predicting deformation of an envelope structure and surface settlement caused by deep foundation excavation with spatial effects. Firstly, the principle of minimum potential energy was applied and the lateral displacement equation of the envelope structure was derived, considering spatial deformation effects. Secondly, based on linear elasticity theory, a surface settlement expression was formulated utilizing the plane strain boundary. Finally, the stratigraphic loss method was used to establish a connection between horizontal envelope deformation and surface settlement, allowing for calculations of surface settlement at any position behind the envelope structure. The effectiveness and practicability of the proposed method were demonstrated by comparison of two existing foundation-pit engineering examples.
考虑空间效应的深基坑变形场预测方法
随着城市建设的快速发展和施工技术的不断进步,城市地下空间得到了极大的开发和利用。紧邻建筑物、构筑物和管线的基坑工程日益增多。为确保建筑及周边设施的安全,对基坑开挖引起的变形进行预测至关重要。本研究提出了一种简单的计算方法,用于预测具有空间效应的深基坑开挖引起的围护结构变形和地表沉降。首先,应用最小势能原理,考虑空间变形效应,推导出围护结构的侧向位移方程。其次,基于线性弹性理论,利用平面应变边界建立了地表沉降表达式。最后,利用地层损失法建立了水平围护结构变形与地表沉降之间的联系,从而可以计算围护结构后方任意位置的地表沉降。通过对两个现有基坑工程实例的比较,证明了所提方法的有效性和实用性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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