桩网复合地基离心模型试验中桩顶轴力测试方法研究  

Test method for axial force at pile top in centrifugal model tests on pile-net composite foundation

作　　者：张军杰 顾行文[2,3] 任国峰 周春儿[4] 王年香 ZHANG Junjie;GU Xingwen;REN Guofeng;ZHOU Chuner;WANG Nianxiang(Henan Nuclear Technology Application Center,Zhengzhou 450000,China;Geotechnical Engineering Department,Nanjing Hydraulic Research Institute,Nanjing 210024,China;The National Key Laboratory of Water Disaster Prevention,Nanjing 210029,China;Guangdong Province Planning&Design Institute for Water Transportation Co.,Ltd.,Guangzhou 510050,China)

机构地区：[1]河南省核技术应用中心,河南郑州450000 [2]南京水利科学研究院岩土工程研究所,江苏南京210024 [3]水灾害防御全国重点实验室,江苏南京210029 [4]广东省航运规划设计院有限公司,广东广州510050

出　　处：《岩土工程学报》2024年第S01期264-267,共4页Chinese Journal of Geotechnical Engineering

基　　金：国家重点研发计划“交通基础设施”重点专项2023年度项目(2023YFB2604200)。

摘　　要：桩网复合地基是常见的软土加固措施。在开展桩网复合地基离心模型试验时,为了分析桩土应力比,需要测量桩顶轴力和桩间土压力。微型土压力计在离心模型试验中已经得到广泛应用,但尚无成熟的微型桩顶轴力测试传感器。利用模型桩的桩帽,开发了一种离心模型试验专用桩顶轴力测试方法,标定结果显示该方法测试线性度好。通过某桩网复合地基离心模型试验和数值分析的桩土应力比结果对比分析,验证了该方法的测试效果。The pile-net composite foundation is a common soft soil reinforcement measurement.In order to analyze the pile-soil stress ratio,it is necessary to measure the axial force at the pile top and the soil pressure between piles in the centrifugal model tests.The mini-earth pressure cells have been widely used in the centrifugal model test,but there is no commonly accepted mini-axial force sensor.In this study,a special method is developed for testing the axial force at the top of piles in the centrifugal model tests by using pile caps.Great linearity is shown through the calibration data.The effects of the proposed method are verified by the pile-soil stress ratio results from the centrifugal model test and numerical analysis of a pile-net composite foundation.

关 键 词：桩网复合地基 离心模型试验 桩顶轴力 测试 桩土应力比 

分 类 号：TU435[建筑科学—岩土工程]