基于有限差分的银川地区大直径灌注桩承载性状研究  

Study on bearing behavior of large diameter bored piles in Yinchuan area based on finite difference

作　　者：吴军 万再新 沈大庆 赵威威 王晓峰 WU Jun;WAN Zaixin;SHEN Daqing;ZHAO Weiwei;WANG Xiaofeng(China Railway Xi′an Bureau Group Co.,Ltd,Xi′an 710054,China;China JiKan Institute of Engineering Investigations and Design,Co.,Ltd,Xi′an 710043,China)

机构地区：[1]中国铁路西安局集团有限公司,陕西西安710054 [2]机械工业勘察设计研究院有限公司,陕西西安710043

出　　处：《西安建筑科技大学学报（自然科学版）》2021年第4期545-551,共7页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：陕西省科技统筹创新项目(2015KTCG01-08)。

摘　　要：针对现场采用静载法测试桩身内力和变形,往往不能得到破坏时真实数据这一问题.本文以银川市某工程为背景,现场静载试验采用锚桩法提供反力,滑动测微计测试桩身内力和变形,并与数值计算结果进行对比分析.结果表明:极限荷载作用下桩体压缩变形量接近桩顶沉降的一半;在承载力特征值作用下可以忽略端阻力的贡献;提出在极限荷载下桩身侧阻力和端阻力的建议值;验证了数值模拟的可靠性并一定程度上弥补现场静载试验数据不足的问题.研究结论对银川地区桩基设计具有一定的参考价值.In view of the problem that the real data of the damaged pile cannot be obtained when the static load method is used to test the internal force and deformation of the pile in the field,this study,based on the background of a project in Yinchuan,uses anchor pile method to provide reaction force in the field static load test,and sliding micrometer to test the internal force and deformation of the pile,and then the test results are compared with the numerical calculation results.The study shows that the compression deformation of pile under ultimate load is close to half of pile top settlement,and the contribution of end resistance can be ignored under the action of characteristic value of bearing capacity.The study also proposes the suggested values of pile side resistance and end resistance under ultimate load,verifies the reliability of numerical simulation and to a certain extent makes up for the lack of on-site static load test data.The research conclusion has a certain reference value for the design of pile foundation in Yinchuan area.

关 键 词：大直径灌注桩 滑动测微计 桩承载性状 数值模拟 

分 类 号：TU45[建筑科学—岩土工程]