基于硅压阻式传感器与光纤传感的静压桩贯入模型试验应用研究  

Application of silicon piezoresistive and fiber Bragg grating measurement technique in jacked pile driving model test

作　　者：王永洪[1,2] 张明义[1,2] 张春巍[1,2] 白晓宇 刘俊伟[1,2] WANG Yong-hong;ZHANG Ming-yi;ZHANG Chun-wei;BAI Xiao-yu;LIU Jun-wei(School of Civil Engineering,Qingdao Technological University,Oingdao,266033,China;Collaborative Inno-vation Center of Engineering Construction and Safety in Shandong Blue Economic Zone,Qingdao Technological U-niversity,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]蓝色经济区工程建设与安全协同创新中心青岛理工大学,山东青岛266033

出　　处：《光电子．激光》2018年第8期811-816,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(51078196;41502304);山东省重点研发计划项目(2017GSF16107);山东省自然科学基金项目(ZR2016EEP06)资助项目

摘　　要：将微型硅压阻式土压力传感器、孔隙水压力传感器及增敏微型光纤光栅(fiber Bragg grating,FBG)应变传感器应用于静压桩贯入模型试验中,很好地测试了静压桩贯入过程桩端阻力、桩身轴力、桩土界面土压力和孔隙水压力。初步试验表明,微型硅压阻式土压力传感器、孔隙水压力传感器及增敏微型FBG应变传感器应用在静压模型桩贯入过程中,实现了贯入过程的桩端阻力、桩身轴力、桩土界面土压力和孔隙水压力的实时监测;桩身轴力和桩土界面有效侧向压力均随贯入深度的增加而增加,但同一深度处侧向压力逐渐减小。为静压桩贯入测试方法提供了参考依据,对进一步研发室内试验微型传感器具有参考价值。Silicon piezoresistive earth pressure sensor,pore water pressure sensor and sensitive miniature fiber Bragg grating （FBG） strain sensor are used in jacked pile driving model test,aiming at stress test on jacked driving model pile, resistance at pile end, pile shaft force, earth pressure and pore pressure on interface between pile and soil for jacked pile driving can be monitored. The results demonstrate that re- sistance at pile end, lateral pressure, earth pressure and pore water pressure on interface between pile and soil in jacked pile driving can be monitored based on silicon piezoresistive earth pressure sensor, pore pressure sensor and FBG strain sensors in jacked pile driving model test. The pile shaft force and effec- tive lateral pressure on interface between pile and soil both increase with the increase of driving depth, but lateral pressure decreases at the same depth. It provides reference basis for choosing better measure- ment methods in jacked pile driving,and it is worth of referring for the micro sensor in laboratory test.

关 键 词：微型 硅压阻式 光纤光栅 静压桩 贯入试验 

分 类 号：TU473[建筑科学—结构工程]