按桩顶沉降控制嵌岩桩竖向承载力的方法

Method of determination of vertical bearing capacity of rock-socketed pile by the settlement of pile top

结合现场嵌岩桩试桩资料,深入分析了嵌岩桩的竖向承载机理,并提出了按桩顶沉降量控制嵌岩桩竖向承载力的设想及其相应的计算方法,该方法可充分考虑桩侧土(岩)阻力及桩端岩层阻力的发挥程度,尤其适用于超长嵌岩灌注桩竖向承载力的计算,最后结合某大桥嵌岩桩静载荷试验数据进行了分析,理论计算与实测结果吻合良好。

Based on the data from in-situ rock-socketed test piles, the vertical bearing mechanism of rock-socketed piles is deeply discussed in this paper. Further, the idea to determine the vertical bearing capacity of rock-socketed piles by the settlement of pile top is suggested with the corresponding calculating method presented. And the method can consider the development of side friction of soil along the pile shaft and the end bearing by rock at the bottom, which is especially suitable for the determination of vertical bearing capacity of ultra-long, cast-in-place and rock-socketed piles. Finally, an analysis is made on the static loading test data of a rock-socketed pile in a bridge, the results of which show a good agreement with those measured.