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无粘结钢绞线抗拔桩是一种桩身混凝土受压工作的新型抗拔桩。文中采用数值分析方法分析了砂土中无粘结钢绞线抗拔桩和普通抗拔桩的承载特性及其关系,探讨了桩-土参数对无粘结钢绞线抗拔桩的抗拔系数修正值的影响。结果表明,无粘结钢绞线抗拔桩的极限承载力大于同条件下的普通抗拔桩,桩身的压缩量小于普通抗拔桩的拉伸量。抗拔系数修正值随桩的长径比L/D、桩的泊松比νp以及桩周土的平均剪切模量Gavg的增大而增大,并呈线性关系,与土的泊松比νs呈线性减小关系。最后给出了无粘结钢绞线抗拔桩抗拔系数的计算公式。
Unbonded steel strands uplift pile is a new type of uplift pile work under pressure of concrete. In this paper, the load-bearing characteristics of unbonded steel strands uplift pile and common pile in sandy soil are analyzed by numerical analysis. The relationship between pile-soil parameters and unbonded strands uplift pile is discussed. Effect of coefficient correction value. The results show that the ultimate bearing capacity of unbonded steel strands is larger than that of ordinary pile under the same conditions. The compression of pile body is smaller than that of ordinary pile. The correction coefficient of pull-up coefficient increases with the increase of L / D, Poisson’s ratio νp and Gavg of soil around pile, and has a linear relationship with Poisson’s ratio of soil νs decreases linearly. Finally, the formula for calculating the pullout coefficient of unbonded steel strands is given.