PHC管桩在地铁车辆段中的应用

吴珩，吕文甫，齐小亮，王一桦，易云鹏

摘要:

地铁车辆段由于后期土方填筑量较大,常常发生工后沉降较大等问题。以杭州某地铁车辆段地基加固为例,通过现场高应变检测试验,探讨PHC管桩在地铁车辆段中的应用效果,分析桩身的完整性情况,验证PHC管桩的承载力。结果表明：PHC管桩竖向抗压极限承载力均大于1000kN,满足结构及设计要求；PHC管桩桩身结构完整性系数β均为1,表明检测的PHC管桩均为Ⅰ类桩；PHC管桩均已发挥了侧阻和端阻力,端阻力与总阻力比值位于37%~44%,侧摩阻力与总阻力比值位于56%~63%；PHC管桩在地铁车辆段地基加固中具有较好的应用效果。

Abstract:

Due to the large amount of earthwork filling in the later stage, the subway depot often has problems such as large post construction settlement. Taking the foundation reinforcement of a Metro Depot in Hangzhou as an example, through the field high strain detection test, this paper discussed the application effect of PHC pipe pile in Metro Depot, analyzed the integrity of pile body, and verified the bearing capacity of PHC pipe pile. The results show that the vertical compressive ultimate bearing capacity of PHC pipe piles is greater than 1000KN, which meets the structural and design requirements; Structural integrity coefficient of PHC pipe pile β All are 1, indicating that the PHC pipe piles tested are class I piles; PHC pipe piles have exerted side resistance and end resistance. The ratio of end resistance to total resistance is 37% ~ 44%, and the ratio of side friction to total resistance is 56% ~ 63%; PHC pipe pile has good application effect in foundation reinforcement of Metro Depot.