摘要
基于室内模型基桩竖向承载试验及内力测试结果,分析了不同直径基桩的桩顶变形、内力等特性及分布规律,以及加载过程中的侧阻增强效应。试验结果表明:基桩在一定荷载作用下,桩端出现侧阻增强效应;侧阻增强效应与桩径有关,并呈单调递增关系。在此基础上,分析了桩端与桩侧土体在极限承载情况下的能量传递规律,再利用虚功原理计算出桩侧土体对桩身增加的径向压力值,并根据摩尔库伦理论提出了考虑侧阻增强效应的基桩竖向极限承载力公式。与室内基桩承载力试验数据的对比,验证了该计算方法的合理性。
Base on the laterally static load laboratory model test,the distribution law of the settlement on the pile top,the inner force along the pile and the lateral resistance enhanced effect of the pile with different pile diameter have been deeply analyzed. the results of the model test shows that the lateral resistance enhanced effect will occur when the vertical loads reach a certain value. Besides,the enhancement value of the lateral resistance is related to the pile diameter,and it is a increasing function of pile diameter. Then,the energy transfer law under limit state for the soil surrounding the pile side and pile tip are analyzed by the limit analysis theory,and the increased normal pressure is derived by means of virtual work principle,so an ultimate bearing capacity calculation method with considering enhancement effect of pile lateral resistance is proposed. Finally,the comparison of the calculated results with the measured data verifies the reasonability of the method.
出处
《公路工程》
北大核心
2016年第2期1-5,32,共6页
Highway Engineering
基金
国家自然科学基金(50708033)
教育部博士点基金(20070532008)
湖南省交通科技计划项目(201421)
关键词
基桩
静载荷试验
极限承载力
侧阻增强效应
single pile
laterally static load test
ultimate bearing capacity
lateral resistance enhanced effect
