软土地区超深基坑引发邻近重要建筑沉降的倾斜注浆主动控制方案——以天津地铁7号线某地下四层站工程为例
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TU43

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中建基础科技研发课题,(CSCIC-2020-KT-(01));中建股份科技研发计划资助,课题编号(CSCEC-2021-Z-(25))


Study on active control scheme of settlement of adjacent important buildings caused by super deep subway foundation excavation in soft soil area
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    摘要:

    当地铁车站周围有敏感建筑物存在时,为了满足建筑物的功能性需求,对基坑工程的变形控制技术提出了更高的要求。本文以天津地区某超深地铁车站基坑邻近医院敏感建筑开挖为例,对基坑开挖影响进行分析,在超深地铁车站与医院敏感建筑之间的土层中注浆恢复建筑沉降。根据建筑实时沉降值动态调整注浆量,实施竖直均匀注浆可控制建筑物沉降,但对邻近车站基坑的不利影响较大。因此改进提出倾斜均匀注浆减小对基坑的影响,对不同注浆角度和不同注浆范围的注浆效果进行分析,比较注浆之后的建筑沉降、车站基坑变形和地表土体沉降。结果表明:倾斜注浆角度过大在减小建筑物邻近注浆体一侧的沉降值时其他位置会发生较大隆起;增大注浆体顶部埋深能够减弱地表隆起现象。此次研究对于实际工程有重要的理论价值和实际价值,将建筑沉降的控制效果和基坑自身的结构变形作为评价注浆效果的依据,有利于选择最佳注浆方案。

    Abstract:

    When there are sensitive buildings around subway stations, in order to meet the functional requirements of buildings, the deformation control technology of foundation excavation engineering is put forward higher requirements. In this paper, taking the excavation of sensitive buildings adjacent to the foundation excavation of an ultra-deep subway station in Tianjin as an example, the influence of excavation is analyzed, and the settlement of buildings is restored by grouting in the soil layer between the ultra-deep subway station and sensitive buildings in hospital. The settlement of buildings can be controlled by dynamically adjusting the amount of grouting according to the real-time settlement value of buildings and implementing vertical uniform grouting, but it has a great adverse effect on the foundation excavation of adjacent stations. Therefore, it is proposed to reduce the influence of inclined and uniform grouting on the foundation excavation. The grouting effects of different grouting angles and different grouting ranges are analyzed, and the building settlement, station foundation excavation deformation and surface soil settlement after grouting are compared. The results show that when the inclined grouting Angle is too large, the settlement value of the adjacent side of the building will be reduced. Increasing the buried depth at the top of grouting can weaken the surface heave. This study has important theoretical and practical value for the practical project. The control effect of building settlement and the structural deformation of foundation excavation itself are taken as the basis for the evaluation of grouting effect, which is conducive to the selection of the best grouting scheme.

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周强,高洁,郑刚,等. 软土地区超深基坑引发邻近重要建筑沉降的倾斜注浆主动控制方案——以天津地铁7号线某地下四层站工程为例[J]. 科学技术与工程, 2023, 23(23): 10049-10058.
Zhou Qiang, Gao Jie, Zheng Gang, et al. Study on active control scheme of settlement of adjacent important buildings caused by super deep subway foundation excavation in soft soil area[J]. Science Technology and Engineering,2023,23(23):10049-10058.

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历史
  • 收稿日期:2022-09-16
  • 最后修改日期:2023-05-27
  • 录用日期:2022-12-26
  • 在线发布日期: 2023-08-18
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