泥岩地基钻孔灌注桩承载力试验评价

Experimental assessment of bearing capacity of the cast-in-situ bored pile in mudstone foundation

依据某高速公路桥梁工程3根钻孔灌注桩的单桩竖向抗压静载试验,以及桩身轴力传递和桩侧阻力的测试,对其静载试验Q-S曲线的特性、桩身轴力传递机理、桩侧阻力和桩端承力发挥性状的分析,探讨了钻孔方法、泥浆循环等施工因素对钻孔灌注桩的工程性状的影响,揭示了泥岩地基中钻孔灌注桩的承载力特性和破坏机理模式。

Three cast-in-situ bored piles are used as test piles to carry out the single-pile vertical compression static load experiment for the construction of a bridge on a highway. The pile's axial force transmission and lateral resistance properties were tested. The characteristic of the Q-S curve of the static load experiment, the transmission mechanism of the pile's axial force,and the performance of the pile's lateral resistance and end-bearing force are analyzed. The effect of the the borehole formation method and mud circulation on the engineering properties of the cast-in-situ bored pile are discussed. The characteristics of the bearing capacity of such pile in mudstone foundation as well as the pile's failure mechanism are found out.