钻孔灌注桩孔壁稳定性的影响因素研究

以某大型桥梁近接工程为背景,采用专业岩土工程有限元软件Plaxis,对钻孔灌注桩孔壁稳定性的影响因素进行了数值分析研究.研究结果表明:若无邻近老桩基影响,孔径、孔深、泥浆相对密度、护筒深度及成孔时间是钻孔灌注桩孔壁稳定的主要影响因素;在邻近老桩基的影响下,护筒保护和护筒穿越土层的合理深度是可以将两邻近桩基相互影响降到最...

Research of Factors Affecting Stabilization of Hole Wall of Bored Pile

Based on a large bridge approaching construction, the numerical analysis of influencing factors of  stabilization of hole wall was performed by using the geotechnical engineering finite element analytical software Plaxis. The research result indicates that (1)without considering the influence of adjacent old pile foundation, aperture, hole depth, specific gravity of  slurry, protective barrel depth and hole forming time are key influencing factors which affect the stabilization of hole wall of bored pile; (2)considering the influence of adjacent old pile foundation, protective barrel and the proper depth of protective barrel are assurances which may reduce the interrelationship of new pile foundation and adjacent old pile foundation. The application of this research result can increase efficiency of drilling, effectively control the impact of two extremely close adjacent pile foundations, ensure construction safety.