基于数值试验的嵌岩桩横向承载力研究  

Study on Lateral Bearing Capacity of Rock-socketed Piles Based on Numerical Tests

作　　者：张坤勇[1,2] 李广山[1,2] 杜伟[1,2] 夏璐 

机构地区：[1]河海大学岩土力学与堤坝工程教育部重点实验室,江苏南京210098 [2]江苏省岩土工程技术工程研究中心,江苏南京210098 [3]陕西省交通规划设计研究院,陕西西安710065

出　　处：《四川大学学报（工程科学版）》2016年第6期58-67,共10页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金重点资助项目(41530637);中央高校基本科研业务费专项资金项目(2015B17714);中国交通建设股份有限公司科技研发项目(2012-ZJKJ-11)

摘　　要：采用有限元法对横向受荷嵌岩桩的现场试验加荷过程进行数值试验,获得和现场试验的加载范围内结果一致的荷载-位移曲线,验证数值模型的合理性。采用数值模型开展数值试验加载直至破坏,从而获得完整的荷载-位移曲线。基于已有的地基反力模量Ki的解答方法,对现场试验数据进行回归分析,得出荷载-位移曲线初始斜率Kh求解的经验公式,给出横向受荷嵌岩桩荷载-位移曲线的双曲线函数理论计算方法。通过与现场试验曲线的对比,验证所提方法的准确性。采用常用的4种横向受荷嵌岩桩承载力计算方法,对经过数值试验扩展的水平荷载-桩顶位移曲线分析,对不同方法的适用性进行比较,建议采用双曲线函数法对横向受荷嵌岩桩的承载力进行计算。The process of field loading test for laterally loaded rock-socketed piles was simulated by finite element method. The load displacement curves obtained were consistent with the field test results within the loading range, and the rationality of the numerical model was verified. Continues load increment was done until the pile failed using the numerical model to generate a full load-displacement curve. Based on the existing foundation reaction modulus Ki solution method, the regression analysis was carried out with the field test data and the empirical formula of the initial slope Kh of the load displacement curves was obtained. Hence, a hyperbolic function theory for load displacement curve of laterally loaded rock-socketed piles was proposed. The accuracy of the proposed method was verified by contrasting with the field test curves. Using the conventional four laterally loaded rock socketed pile capacity calculation method, the numerical test was extended through laterally loaded pile top displacement curves analysis to carry out the analysis of the applicability of the different methods. The method of hyperbolic function was suggested for calculation of the bearing capacity of rock-socketed laterally loaded piles after comparing the various methods.

关 键 词：嵌岩桩 横向受荷 承载力 数值试验 

分 类 号：TU443[建筑科学—岩土工程]