基于单桩静载试验结果的群桩基础沉降计算方法  

Settlement Calculation of Pile Group Foundation Based on Results of Vertical Static Load Test on Single Pile

作　　者：毛坚强[1] 蒋媛[2] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031 [2]中国电建集团成都勘测设计研究院有限公司,四川成都610072

出　　处：《铁道学报》2017年第1期97-103,共7页Journal of the China Railway Society

摘　　要：提出一个利用单桩静载试验结果及弹性理论法确定群桩基础沉降的方法。该法中,基础中各桩在自身所受竖向力作用下产生的沉降按静载试验得到的沉降-荷载关系确定,由他桩引起的沉降则根据试验得到的桩侧摩擦力分布曲线及桩端压力,应用弹性理论法计算。计算中,对基础中各桩赋以不同的竖向力进行试算,从中寻找出能使承台的平衡方程及各桩沉降变形协调条件满足的组合,即为其真实解。按照上述原理,建立相应的计算公式,编制计算程序。最后,对一桥梁工程桩基础的沉降进行计算,并与实测结果进行对比,二者吻合较好,证明了本法的可行性及合理性。A method to calculate the settlement of pile foundation based on the results of vertical static load test of single pile and the elastic theory method was presented.In the method,the settlement of every pile due to its own vertical load was determined by the settlement-load curve of vertical static load test,while the settlement caused by other piles was calculated with the elastic theory method based on the test result of side friction curve and toe force of pile.Tentative calculation was performed on the different vertical forces of each pile to find out the solution.that met the equilibrium equation of pile cap and the coordination conditions of the settlement of each pile.Following the theory,corresponding calculation formulae were constructed and calculation program was compiled.Finally,the settlement of the pile foundation of a bridge was calculated with the method and the better agreement of the results between the calculation and in-situ measurement proved the feasibility and rationality of this method.

关 键 词：桩基础 沉降 单桩竖向静载试验 弹性理论法 MINDLIN解 

分 类 号：TU470[建筑科学—结构工程]