光纤光栅传感技术在桩周摩阻力模型试验中的应用  

Application of FBG sensing technology in model test of pile friction resistance

作　　者：范磊[1] 张烨 刘曦[1] 董岳林 孙腾[1] 

机构地区：[1]长安大学,陕西西安710064 [2]陕西建工集团机械施工有限公司,陕西西安710032

出　　处：《河南城建学院学报》2017年第5期28-32,共5页Journal of Henan University of Urban Construction

摘　　要：我国西北地区分布着大面积自重湿陷性黄土,浸水湿陷后会导致桩土相对位移增大,导致产生较大的负摩阻力,湿陷性所带来的桩身负摩阻力会给桩基工程带来来巨大危害。本文借助60g.ton土工离心机开展了系列离心模型试验,将轻质,微型,抗电磁干扰的光学传感技术与土工离心模型试验相结合,通过室内标定试验结果和传统电阻式应变仪试验结果对比分析得到桩周土体湿陷条件下桩身摩阻力变化规律,分析了不同相对密度细沙作为持力层条件下桩身摩阻力变化规律,同时验证FBG传感器在离心场中工作的稳定性。In northwest China, the large area of collapsible loess is distributed, and the relative displacement ofpile and soil will increase after soaking in the wet depression, which leads to the large negative friction, and thefriction caused by the wet subsidence will bring great harm to the pile foundation project. With the help of 60g.ton geotechnical centrifuge, a series of centrifugal model tests were carried out to combine the light, micro andelectromagnetic interference optical sensing technology with the geotechnical centrifuge model test. Based on theresults of indoor calibration test and the traditional resistance strain gauge test results, the variation regularity ofpile-body frictional resistance under the condition of pile-soil collapsibility is obtained, and the friction resistanceof the pile body under the condition of different relative density sand as the bearing layer is analyzed. Theregularity of force variation and the stability of FBG sensor working in centrifugal field are validated.

关 键 词：光纤传感 离心试验 湿陷性黄土 桩基摩阻力 

分 类 号：TU457[建筑科学—岩土工程]