海洋高桩基础水平大变位性状模型试验研究  

Model tests on characteristics of ocean and offshore elevated piles with large lateral deflection

作　　者：朱斌[1,2] 朱瑞燕[3] 罗军[1,2] 陈仁朋[1,2] 孔令刚[1,2] 

机构地区：[1]浙江大学软弱土与环境土工教育部重点实验室,浙江杭州310058 [2]浙江大学岩土工程研究所,浙江杭州310058 [3]浙江省电力设计院,浙江杭州310012

出　　处：《岩土工程学报》2010年第4期521-530,共10页Chinese Journal of Geotechnical Engineering

基　　金：国家自然科学基金项目(50979097);国家"863"高技术研究发展计划项目(2007AA05Z427)

摘　　要：利用浙江大学自行研制的大型地基与边坡工程模型试验系统开展了单桩基础水平大变位的大比例模型试验,获得了桩身屈服前后不同深度的桩身位移和桩身弯矩。通过建立桩身位移、弯矩及桩周土反力三者之间相互推导的有效途径,研究了桩周土p–y曲线沿深度的分布特性,发现传统Reese法和API法p–y曲线具有偏大的初始刚度及偏小的极限土抗力。在拟合桩周土反力试验值的基础上,提出了计算桩基水平大变位的双曲线型p–y曲线模型。Large-scale model tests on large lateral deflection of a single elevated pile are carried out using the Large Foundation and Slope Engineering Simulation System of Zhejiang University,and the lateral displacement and moment of the pile shaft at different depths for each pile are studied.Through establishing relationships among the lateral displacement,the moment of the pile shaft and the soil reaction force based on the test results,the characteristics of p–y curves at different depths are studied.It is found that the p–y curves of the traditional Reese method and API method have the relatively larger initial stiffness but smaller ultimate soil-pile interaction compared with the test results.By fitting the test soil reaction force,a hyperbolic p–y curve to compute large lateral displacement of the elevated pile is presented.

关 键 词：大比例模型试验 水平荷载 桩 大变位 p–y曲线 

分 类 号：TU43[建筑科学—岩土工程]