基于光电测试技术桩土界面受力特性模型试验  

Model test based on photoelectric integration for mechanical behavior of pile-soil interface of jacked pile

作　　者：白晓宇[1,2] 王永洪[1,2] 张明义[1,2] 桑松魁 王鹏[1] BAI Xiao-yu;WANG Yong-hong;ZHANG Ming-yi;SANG Song-kui;WANG Peng(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Collaborative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone,Qingdao University of Technology,Qingdao 266033,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]青岛理工大学蓝色经济区工程建设与安全协同创新中心,山东青岛266033

出　　处：《广西大学学报（自然科学版）》2018年第3期1177-1182,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金资助项目(51778312;51708316);山东省重点研发计划项目(2017GSF16107;2018GSF117008);山东省自然科学基金资助项目(ZR2016EEQ08;ZR2017PEE06);山东省高等学校科技计划项目(J16LG02);青岛市应用基础研究计划项目(16-5-1-39-jch);中国博士后科学基金面上项目(2018M632641)

摘　　要：为研究预制桩在沉桩过程中桩—土界面侧压力对桩身轴力的影响,模型桩桩身同时埋设温度自补偿微型光纤光栅应变传感器、微型硅压阻式(土压力和孔隙水压力)传感器,借助光电一体化测试技术,分析了侧压力对桩身轴力的影响规律。试验结果表明:温度自补偿微型光纤光栅应变传感器性能稳定,可实时监控桩身轴力变化;微型硅压阻式土压力及孔隙水压力传感器成活率高,成功测得了桩—土界面土压力和孔隙水压力。在沉桩过程中,侧压力随贯入深度逐渐增加,同一深度处的侧压力反而减小;侧压力对桩身轴力影响值约为1~2倍,最大可达2.7倍。研究结果对重新认识预制桩的贯入机理及承载性状有重大意义。In order to study the influence of lateral pressure at the pile-soil interface on the axial force of precast piles in jacking,the model pile was simultaneously embedded with the temperature self-compensation micro fiber grating sensor,the micro silicon piezo-resistive soil pressure sensor and the pore water pressure sensor,and the photoelectric integration was applied. The results show that the temperature self-compensation micro fiber grating sensor preforms stably and can monitor the axial force change of the pile in real time,and the micro silicon piezo-resistive sensor（ for soil and pore water pressure） has high survival rate,and successfully measures the earth and pore waterpressure at the pile-soil interface. During the pile jacking,the lateral pressure increases along with the penetration depth,while the lateral pressure at the same depth decreases. The influence of the lateral pressure on the pile＇s axial force is about 1-2 times,and the maximum reaches 2.7 times.The research results provide great significance for the understanding of the penetration mechanism and bearing behavior of precast piles.

关 键 词：有效侧压力 轴力 模型试验 光纤光栅 微型硅压阻式传感器 

分 类 号：TU473[建筑科学—结构工程]