基于波兰曲线法判定大直径桩极限承载力的计算方法  

The Computational Method for Ultimately Load of Large-diameter Pile on the Basis of Poland's Curve Method

作　　者：温生国 董天文[2] 

机构地区：[1]辽宁桥梁安全工程技术研究中心,辽宁沈阳110122 [2]辽宁省交通高等专科学校,辽宁沈阳110122

出　　处：《宁夏大学学报（自然科学版）》2016年第1期49-53,共5页Journal of Ningxia University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51178457);辽交专人才基金(YXRC201203)

摘　　要：通过静荷载试验判定极限荷载仍然是一种最为可靠的方法,但对呈现渐进破坏、无明显极限荷载拐点的大直径桩基础而言,建立符合大直径桩破坏机理、突出极限荷载判定客观性的计算方法显得尤为重要.据此,提出基于渐进破坏机理的波兰曲线法的数学计算公式和计算方法,应用ANSYS软件的二次开发功能,编写了波兰曲线法计算极限荷载的APDL参数化计算程序,计算了20根大直径桩基础的极限荷载.结果表明,本文方法可以反映大直径桩基础的极限荷载破坏特征,为设计提供的安全系数更为合理,对工程应用具有一定意义.In the designing of pile foundation,the objectivity of judgement values about ultimate load which is exerted on large diameter pile foundation is an essential problem all the time.The static load test which is used to judge the ultimate load is still reliable,however,it is obviously important to establish a calculation method which not only accords with the failure mechanism of large diameter pile foundation,but also gives prominence to the objectively estimated values of the ultimate load.Therefore,the mathematical calculation formula and calculation method which are accords with Poland＇s curve method of gradual failure mechanism are put forward.Applying with the second time development of ANSYS,the calculation process which calculates ultimate load with Poland＇s curve method is written.The ultimate loads of 20 large diameter pile foundations are calculated.The research indicates that the method which is related to the article can reflect on the progressive failure of large diameter pile foundation under ultimate load,and it is more reasonable than before to provide designers with the safety factor,so that there will be momentous advantages in engineering application.

关 键 词：大直径桩基础 极限荷载 安全系数 

分 类 号：TU43[建筑科学—岩土工程]