确定嵌岩灌注桩竖向承载力的荷载传递法

以荷载传递解析法研究嵌岩灌注桩桩周及桩底荷载传递性状，并针对实际工程中桩周土体的加工软化和加工硬化型土的不同情况，建立了各种土体与岩层的衙载传递统一模型。对于桩端荷载传递机理，考虑嵌岩灌注桩桩端沉渣的影响，采用桩端阻三折线模型。在此基础上，充分考虑桩侧土(岩)与桩端岩层阻力的发挥程度，导出了桩顶沉降量与桩顶荷载之间的关系式，由此可通过控制桩顶沉降量来确定嵌岩灌注桩的桩顶竖向承载力。最后，以试桩结果检验了该方法的可行性。

LOAD TRANSFER METHOD FOR DETERMINING VERTICAL BEARING CAPACITY OF ROCK-SOCKETED FILLING PILE

The analytical method of load transfer is adopted to study the load transfer mechanism of rock-socketed filling pile in this paper. According to the different behaviors of work-softing or work-hardening of soil in engineering practice,a uniform load transfer model is established for various types of soil or rock. Based on this model,the relation formula between the settlement and load of pile top is deduced,which can consider side resistance force of soil (rock) along the pile shaft,the end resistance at the bottom and the influence of slime. As a result,the vertical bearing capacity of rock-socketed filling pile may be determined by the settlement of pile top. The calculated results by the presented method show a good agreement with those measured from test pile.