钻孔灌注桩孔壁稳定性的影响因素研究  

Research of Factors Affecting Stabilization of Hole Wall of Bored Pile

作　　者：王中文[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《公路交通科技》2011年第1期86-90,95,共6页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(40772170)

摘　　要：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低的保证。以上研究结果的应用可提高钻孔效率,并可有效控制超近距离建(构)筑物桩基施工的破坏性影响,保证施工安全。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.

关 键 词：桥梁工程 钻孔灌注桩 桩基 孔壁稳定 近距离施工 影响因素 数值分析 

分 类 号：U443.154[建筑科学—桥梁与隧道工程]