隔离桩对隧道侧穿邻近建筑物的沉降影响分析

发布时间：2018-01-06 08:42

本文关键词：隔离桩对隧道侧穿邻近建筑物的沉降影响分析　出处：《城市轨道交通研究》2017年01期 　论文类型：期刊论文

【摘要】：地铁隧道开挖会引起周边建构筑物的沉降及变形,影响建构筑物的安全与正常使用。基于某地铁新建盾构隧道侧穿邻近浅基建筑物工程,介绍了隔离桩的减沉机理,并通过三维数值模拟分析,研究了有隔离桩和无隔离桩两种工况下隧道周边土体的竖向沉降及水平位移分布情况。数值模拟结果表明:采用隔离桩能有效降低隧道周边土体的竖向沉降及水平位移;土体的沉降在隔离桩附近有突变,土体竖向沉降被限制在隔离桩内侧,但地表土体在隔离桩内侧附近有所增大;增加隔离桩能有效阻隔土体向隧道内的滑动趋势,保护隧道周边建构筑物的安全。
[Abstract]:Will cause the settlement and deformation of buildings surrounding the construction of the subway tunnel excavation construction, affect the safety and normal use of the building. A new subway shield tunnel Undercrossing adjacent shallow foundation engineering is introduced based on isolated piles subsidencereduction mechanism, and through numerical simulation analysis, research the isolation pile and pile isolation two kinds of vertical tunnel surrounding soil under the conditions of the settlement and horizontal displacement distribution. Numerical simulation results show that the isolation pile surrounding soil can effectively reduce the vertical settlement and horizontal displacement; soil subsidence in isolation pile near the mutation, soil vertical settlement is limited in isolation pile inside, but the surface of soil around pile isolation the inside has increased; increasing isolation pile can effectively block the soil to the sliding trend of tunnel, tunnel surrounding protect buildings safety.

【作者单位】：南京工业大学交通学院;
【分类号】：U456;U231.3;TU433
【正文快照】： 在地铁隧道施工过程中,为避免或减少土体位移,以及隧道开挖产生的沉降对邻近构筑物的影响,常常在邻近构筑物与施工面间设置隔断墙予以保护。隔断墙形式通常采用钻孔灌注桩、地下连续墙等结构形式。隔离桩的相互作用会产生微拱效应,该效应适度降低了桩外土体的变形。隔离桩良好

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