全套管灌注桩在临近地铁隧道的暗桥桩基工程中的应用

发布时间：2018-03-28 23:22

本文选题：全套管灌注桩　切入点：现场监测　出处：《岩土工程学报》2015年S2期

【摘要】：全套管灌注桩在施工过程中具有无孔壁坍塌、断桩和缩径风险,对周边建筑物地基扰动小等优点,近年来广泛应用于桩基施工中。某快速公交一号线暗桥桩基工程中使用该桩,以避免桩基施工过程对临近的地铁隧道造成影响。详细介绍了该工程的地质概况、全套管灌注桩的施工工艺、以及施工过程中的要点难点,并在距离地铁盾构边线1.5 m和2.0 m的地方布置测斜孔,以测量全套管灌注桩施工引起地铁隧道附近地基土体的水平位移。现场监测结果表明:离地铁盾构边线最近的测斜点累计水平位移的最大值为24.3 mm,没有达到累计报警值(30 mm)。由此可见:全套管灌注桩的施工能有效避免对周围建筑物的扰动。
[Abstract]:The whole casing cast-in-place pile is widely used in pile foundation construction in recent years because of its advantages such as no hole wall collapse, pile breaking and reducing diameter risk, little disturbance to the surrounding building foundation, etc. The pile is used in the pile foundation engineering of a dark bridge of bus Rapid Transit Line 1 (BRT 1). In order to avoid the influence of pile foundation construction on the adjacent subway tunnel, this paper introduces in detail the geological situation of the project, the construction technology of the whole casing cast-in-place pile, and the key points and difficulties in the construction process. The inclined holes are arranged at the distance of 1.5 m and 2.0 m from the shield side line of the subway. The site monitoring results show that the maximum value of cumulative horizontal displacement from the nearest oblique point of shield tunneling is 24.3 mm, which is not reached by measuring the horizontal displacement of the foundation soil near the subway tunnel caused by the construction of the full set of pipe cast-in-place piles. The alarm value is 30 mm. It can be seen that the construction of the whole casing cast-in-place pile can effectively avoid the disturbance to the surrounding buildings.
【作者单位】：河海大学岩土力学与堤坝工程教育部重点实验室;河海大学岩土工程科学研究所;
【基金】：中央高校基本科研业务费专项资金项目(2014B04914) 国家自然科学基金面上项目(51478166) 堤坝工程安全与减灾学科创新引智基地111项目(B13024)
【分类号】：U445.551

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