大直径灌注桩抗拔承载性状分析

根据5根大直径灌注桩现场抗拔静载试验和应力测试结果,分析了嵌岩桩荷载传递性状和嵌岩段摩阻力发挥过程一些特性,得到抗拔桩的桩周土层抗拔系数以及Q–s曲线呈缓变形的抗拔桩极限承载力取值方法。结果表明抗拔桩的曲线形状与持力层岩石风化程度和桩的嵌岩深度有关。同时根据嵌岩段摩阻力发挥过程特点,进一步探讨了影响嵌岩段摩阻力发挥值主要因素。

Analysis on uplift resistance of cast-in-situ piles with large diameter

According to the in-site static uplift tests and stress measurement results of five cast-in-situ piles with large diameter, the load transfer behavior of rock-socketed uplift piles and the characteristics of the lateral friction in pile-rock interface are analyzed. The uplift coefficients of soil strata and the method to determine the ultimate bearing capacity of Q–s curves are obtained. It is shown that the shape of curves is related to the rock weathering of bearing strata and rock-socketed depth. The effect of pile-rock interface on the lateral friction is discussed with its development process.