松花江漫滩地区静压PHC管桩竖向承载力  

Study on Vertical Bearing Capacity of Jacked-in PHC Pipe Pile in Songhua River Floodplain Areas

作　　者：左宏亮[1] 刘景云[2] 李国东[1] 李航[1] 

机构地区：[1]东北林业大学土木工程学院,黑龙江哈尔滨150040 [2]哈尔滨工业大学建筑设计研究院,黑龙江哈尔滨150006

出　　处：《沈阳建筑大学学报（自然科学版）》2009年第6期1088-1093,共6页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(50338020)

摘　　要：目的探讨适合松花江漫滩地区静压PHC管桩的极限端阻力标准值的提高系数、单桩竖向极限承载力标准值的计算公式，给出单桩竖向极限承载力标准值与终压力的区域经验公式．方法对松花江漫滩地区具有代表性的静压PHC管桩的静载试验数据、地质勘察报告以及施工压桩记录进行分析研究，得到静压PHC管桩的极限端阻力标准值的提高系数，进而建立单桩竖向极限承载力标准值的计算公式；运用统计软件SPSS分析拟合数据，提出单桩竖向极限承载力标准值与终压力的区域经验公式．结果桩端持力层为中密中砂时，极限端阻力标准值提高系数在1．8～2．4；桩端持力层为中密粗砂时，极限端阻力标准值提高系数在2．4～3．0；对于桩长在9—24m之间，长径比在24～50的静压管桩，在中粗砂持力层的情况下，综合系数K在0．8—0．9．结论松花江漫滩地区的静压PHC管桩的单桩竖向极限承载力标准值较现行规范有较大提高，研究成果对该区域静压PHC管桩的设计和施工具有一定的指导作用，对该区域静压PHC管桩的进一步推广和应用具有重要的推动作用．According to the data analysis of static load tests, geological exploration reports and construction records of jacked - in PHC pipe pile of the representative projects in the Songhua River floodplain areas, and based on the actual ultimate vertical bearing capacity of a single pile calculated by Q - s curve, the increase coefficients of ultimate tip resistance standard value are obtained, which is 1.8 -2.4 when the bearing stratum under pile tip is medium density medium - grained sand and which is 2.4 - 3.0 when the bearing stratum under pile tip is medium density coarse-grained sand. The formula for the ultimate vertical bearing capacity in the Songhua River floodplain areas is proposed. The empirical formula about the ultimate vertical bearing capacity and final pressure in the Songhua River floodplain areas is established. When the bearing stratum under pile tip is medium density medium-grained or coarse-grained sand, pile length is between 9 m - 24 m and length-diameter ratio is between 24 - 50, the ratio between ultimate vertical bearing capacity of a single pile and final pressure is 0. 8 - 0.9. By comparison with the technical code for building pile foundation（JGJ94- 2008 ）,ultimate vertical bearing capacity of a single pile of jacked-in PHC pipe pile in the Songhua River floodplain areas are increased. The study is instructive and useful in design and construction of jacked-in PHC pipe pile in the Songhua River floodplain areas.

关 键 词：松花江漫滩地区 静压PHC管桩 竖向极限承载力 终压力 

分 类 号：TU473[建筑科学—结构工程]