确定嵌岩灌注桩竖向承载力的荷载传递法  

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

作　　者：赵明华[1] 杨明辉[1] 曹文贵[1] 陈昌富[1] 

机构地区：[1]湖南大学岩土工程研究所,长沙410082

出　　处：《岩石力学与工程学报》2004年第8期1398-1402,共5页Chinese Journal of Rock Mechanics and Engineering

基　　金：教育部高等学校博士学科点专项基金(20020532008)资助课题

摘　　要：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荷载传递统一模型。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。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.

关 键 词：土力学 桩基础 嵌岩灌注桩 荷载传递模型 桩顶沉降量 

分 类 号：TU473.11[建筑科学—结构工程]