浅埋暗挖隧道下穿建筑物桩基托换施工技术

发布时间：2018-03-01 09:34

本文关键词： 暗挖隧道筏板桩基托换沉降控制　出处：《中南大学》2013年硕士论文　论文类型：学位论文

【摘要】：城市地下工程的快速发展必然会出现越来越多的隧道下穿建筑物施工工程案例。受围岩条件及周边建筑环境的影响,隧道下穿建筑物施工过程中可能会遇到地表隆陷、地面建构筑物倾倒损坏、地下管线变形破坏、隧道坍塌等多种风险。本文结合目前正在施工的长株潭城际铁路II标树木岭隧道暗挖区间下穿高升酒店工程,采用方案比选、理论分析、数值计算和现场实践等方法,确定了隧道下穿施工建筑物桩基的托换保护方案,主要包括以下几个方面： (1)根据长株潭城际铁路树木岭隧道下穿高升酒店综合楼段实际的工程地质条件,通过多方案的比选,确定树木岭隧道下穿建筑物段采用桩基筏板托换保护方案。 (2)采用三维数值模拟计算方法,分析了建筑物桩基采用筏板托换的安全性,比较了筏板地基注浆加固以及不同隧道施工方法对隧道施工下穿安全性的影响,确定了隧道下穿施工的具体开挖及支护方案。 (3)通过工程实践,确定了暗挖隧道下穿高升酒店施工的具体方案与安全保障措施,包括筏板施工前的预注浆加固,暗挖隧道施工过程中支护结构的快速闭合以及筏板基础与隧道拱顶之间地层的补充注浆等,有效保证了隧道施工过程中地表建筑物的安全。 (4)桩基托换是个系统工程,好的施工管理与信息化施工是成败的关键,现场监测和信息反馈是保证隧道及地表建筑物安全的重要手段,通过现场实践,确定了整个施工过程中的具体监测方法,现场监测结果论证了所采用技术方案的可靠性。
[Abstract]:The rapid development of urban underground engineering will inevitably lead to more and more construction cases of tunnel underpass buildings. Due to the influence of surrounding rock condition and surrounding building environment, surface subsidence may be encountered in the construction process of tunnel underpass buildings. There are many risks, such as toppling and damage of ground structure, deformation and destruction of underground pipeline, collapse of tunnel, etc. In this paper, according to the current construction of Changsha-Zhuzhou-Xiangtan Intercity Railway II marked Shuiling Tunnel, the project of passing through Gaosheng Hotel is compared and selected. Theoretical analysis, numerical calculation and field practice, etc., have determined the underpinning protection scheme of the pile foundation of the construction under the tunnel, which mainly includes the following aspects:. 1) according to the actual engineering geological conditions of Shuiling tunnel of Changsha-Zhuzhou-Zhuzhou-Xiangtan intercity railway through Gaosheng Hotel complex building section, through the comparison and selection of many schemes, it is determined that the pile foundation raft support protection scheme is adopted in the section of the building under the Shuiling tunnel. In this paper, the safety of raft underpinning for building pile foundation is analyzed by using three-dimensional numerical simulation method, and the influence of grouting reinforcement of raft foundation and different tunnel construction methods on the safety under tunnel construction is compared. The concrete excavation and supporting scheme of tunnel underpass construction are determined. Through engineering practice, the concrete scheme and safety measures for the construction of underground tunneling through Gaosheng Hotel are determined, including pre-grouting reinforcement before raft slab construction. The rapid closure of the supporting structure and the additional grouting between the raft foundation and the tunnel vault during the tunneling construction effectively ensure the safety of the surface buildings during the tunnel construction. 4) pile foundation underpinning is a systematic engineering, good construction management and information construction is the key to success or failure. Site monitoring and information feedback are important means to ensure the safety of tunnel and surface buildings. The concrete monitoring method in the whole construction process is determined and the reliability of the adopted technical scheme is proved by the field monitoring results.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：U455.4;TU753.3

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