软土大规模基坑群工程设计方法与变形控制

doi:10.6040/j.issn.1672-3961.0.2024.188

摘要/Abstract

摘要： 软土地层大规模基坑群工程建设需采取一系列设计方法和施工控制技术,以保障工程安全、工期并有效控制变形,减小对周边环境的叠加影响。结合软土地区大规模基坑的实践经验,系统阐述基坑群工程的设计方法和变形控制技术,包括设置隔断墙跳坑开挖分坑方法、设置缓冲区两侧基坑同步实施方法、考虑敏感环境保护的基坑群微变形控制方法。通过设置隔断墙或缓冲区进行分区开挖,在满足不同地块开发进度要求的同时,有效控制时空效应影响程度及分坑之间的相互影响。当大规模基坑群邻近敏感环境保护目标时,根据邻近分区基坑面积大小,采用轴力自动补偿钢支撑、轴力伺服混凝土支撑系统实现基坑变形动态调整。结合典型工程案例,验证上述设计方法能够达到良好技术经济效果。

关键词: 基坑群, 软土, 环境叠加影响, 分坑设计方法, 变形控制

Abstract: The construction of large-scale foundation pit systems in soft soil strata necessitated the implementation of comprehensive design approaches and advanced construction control techniques to ensure structural safety, timely project completion, and effective deformation management, while minimizing cumulative environmental impacts on surrounding areas. Effectively controlled deformation and reduced the superimposed impact on the surrounding environment. Combined with the practical experience of super-large scale foundation pit in soft soil area, the design method and deformation control technologies of foundation pit group engineering were systematically expounded. It included setting single partition wall skip excavation method, setting buffer-zone symmetrical excavation method, micro-deformation control method of foundation pit group considering sensitive environmental protection. Through the setting of partition walls or buffer zones for zoned excavation, while meeting the development progress requirements of different plots, the influence degree of the space-time effect and the mutual influence between the divided zones could be effectively controlled. When a large-scale group of foundation pits was adjacent to a sensitive environment, according to the size of the adjacent zoned foundation pits, the dynamic adjustment of foundation pit deformation could be achieved by adopting steel strut with automatic axial force compensation system and concrete strut with servo system. Combined with typical engineering cases, it was proved that the above design method could achieve good economical and technological effect of deep excavation group.

Key words: deep excavation group, soft soil, cumulative impact on the environment, zoned design method, deformation control

中图分类号:

TU443

王卫东,徐中华,宗露丹,沈健. 软土大规模基坑群工程设计方法与变形控制[J]. 山东大学学报 (工学版), 2026, 56(3): 25-36.

WANG Weidong, XU Zhonghua, ZONG Ludan, SHEN Jian. Design method and deformation control techniques for large-scale deep excavation group in soft soils[J]. Journal of Shandong University(Engineering Science), 2026, 56(3): 25-36.

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