【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。更多还原

【Abstract】 The Benoto pile has been widely used in the piled foundation due to its advantages of no risks of breakage and reduction for piles, no collapse for holes and small disturbance to the surrounding buildings. The rapid public transport line No. 1 in Nanjing adopts this kind of pile. The site conditions, construction technology of the Benoto pile and difficult and important procedures for its construction are reported. The inclinometer holes located near the subway with the distance of 1.5~2.0 m to measure the horizontal deformation are driven, and the effect of the construction of Benoto pile on the horizontal deformation of foundation soils near the subway is analyzed. The measurements show that the maximum lateral deformation is 24.3 mm for the test section located near the subway with the distance of 1.5 m, which is less than the cumulative alarm value of 30 mm. Hence, it can be concluded that the construction of Benoto pile can effectively avoid the disturbance to its surrounding buildings.更多还原