深厚软土地基细长PHC管桩水平荷载试验研究

通过珠海保税区深厚软土地基中两根细长PHC管桩的水平荷载试验,分析了深厚软土地基中PHC管桩在水平荷载作用下的受力特点.试验结果表明:细长PHC管桩能够抵抗水平荷载的作用;弹性长桩的下端可以看成嵌固于土中而不能转动,由逐渐发展的桩截面抗矩和土抗力来承担逐渐增大的水平荷载;弹性长桩的受力性质主要受上部土层的影响.根据试验结果计算出来的水平地基抗力比例系数m的值对该类工程地质的桩基设计具有一定的参考价值.文中还采用通用有限元软件ABAQUS对PHC管桩的水平承载特性进行了模拟,计算结果能满足精度要求.

Experimental Investigation into PHC Pipe Piles Under Lateral Load in Deep Soft Soil Foundation

Based on the experimental results of prestressed high-strength concrete(PHC) pipe piles subjected to lateral loads in the deep soft soil foundation of Zhuhai free trade zone,the lateral bearing behaviors of the piles are discussed.The results show that the piles with high slenderness ratio can effectively bear the lateral loads,that the underside of the long elastic pile can be considered as a socking into the soil without rotation,the crescent resistance moment and the lateral soil pressure bearing the crescent lateral load,that the bearing capacity of the long elastic pile is mainly affected by the upside soil,and that the calculated proportional coefficient m describing the lateral resistance of foundation can be used as a reference for the design of the similar engineering.Moreover,according to the simulated results of the lateral bearing capability of PHC pipe piles via the finite element code ABAQUS,the high accuracy of the proposed method is finally revealed.