PHC管桩在湿陷性黄土中的应用

Application of PHC pipe pile in collapsible loess

结合工程实例,对高强预应力混凝土管桩(PHC)在湿陷性黄土地区的应用进行了理论计算及试验研究。结果显示,在考虑土塞效应后,根据规范公式计算的单桩极限承载力值偏于保守。此外,根据单桩静载荷试验,验证了当Q-S曲线为缓变型时,采用多项式拟合法推测单桩竖向承载力标准值以及采用S-lgQ法确定单桩总极限侧阻力值的方法,与实际情况较为吻合。

In light of an engineering example, through the detailed theoretical calculations and experimental study of the high-strength prestressed concrete pipe pile in collapsible loess area, for the single pile, the ultimate bearing capacity calculated by code method is conservative after considering the effect of soil plug. In addition, according to the static load test results of single pile, it is legitimately verified that when theQ-S curve is slow variant, the vertical bearing capacity standard value of single pile speculated with polynomial fitting method and the ultimate side resistance value determined by using theS-lgQ method are more consistent with the actual situation.