基于光纤光栅技术测量模型土体内侧向位移的植入梁法
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摘要
准确地测量土体内部侧向位移是土力学试验技术的重点难点之一。将在综合分析一些已经报道的在1g振动台和离心机振动台试验中应用的模型土体内部侧向位移测试技术的基础上,设计一种基于光纤光栅测试技术的新型测试方法。并将该方法与传统方法在振动台试验中进行对比,结果基本一致,说明基于FBG光纤光栅技术的植入梁方法在土体振动台试验中是有效的。
In the field of soil dynamics tests,one of the main issues from many practical problems is to measure the internal displacement of soils.There are many types of traditional transducers for this measurement,but their performance is not satisfactory.The purpose of this work is to develop a new implantable beam method for measuring dynamic lateral displacement.Based on the approach of FBG sensors,shaking table tests are carried out to verify the validity of the proposed method.
In the field of soil dynamics tests,one of the main issues from many practical problems is to measure the internal displacement of soils.There are many types of traditional transducers for this measurement,but their performance is not satisfactory.The purpose of this work is to develop a new implantable beam method for measuring dynamic lateral displacement.Based on the approach of FBG sensors,shaking table tests are carried out to verify the validity of the proposed method.
引文
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[2]THEVANAYAGAN S,KANAGALINGAM T,REINHORN A,et al.Laminar box system for 1-g physical modeling ofliquefaction and lateral spreading[J].Geotech Test,2009,32(5):438-449.
[3]DOBRY R,THEVANAYAGAN S,MEDINA C,et al.Mechanics of lateral spreading observed in a full-scale shaketest[J].Journal of Geotechnical and GeoenvironmentalEngineering,2011,137(2):115-129.
[4]BENNETT V,ZEGHAL M,ABDOUN T,et al.A wirelessshape-acceleration array system for local identification of soiland soil-structure systems[J].Transp Res Rec,2007,2004,60-66
[5]ROSCOE K,ARTHUR J,JAMES R.The determination ofstrains in soils by an X-ray method[J].Civil Engineering andPublic Works Review,1963,58:873-876.
[6]LORENZ H,HEINZ W.Change of density in sands due toloading[C]//Proc 7th Int Conf Soil Mech&Found Engi,1969,1:267-273.
[7]BRANSBY YP,MILLIGAN G.Soil deformation nearcantilever sheet pile[J].Géotechnique,1975,25(2):175-195.
[8]KESAVAN K,RAVISANKAR K,PARIVALLAL S,et al.Experimental studies on fiber optic sensors embedded inconcrete[J].Measurement,2010,43:157-163.
[9]ZHANG W T,LI F,LIU Y L.FBG pressure sensor based onthe double shell cylinder with temperature compensation[J].Measurement,2009,42:408-411.
[10]ZHAO Y,ZHAO Y,ZHAO M G.Novel force sensor based ona couple of fiber Bragg gratings[J].Measurement,2005,38:30-33.
[11]ANTUNES P,ROCHA A M,LIMA H,et al.Thin bondingwires temperature measurement using optical fiber sensors[J].Measurement,2011,44:554-558.
[12]孙锐,袁晓铭,李雨润,等.循环荷载下液化对土层水平往返变形的影响[J].西北地震学报,2009,31(1):8-14.(SUN Rui,YUAN Xiao-ming,LI Yu-run.Effect ofliquefaction on cyclic deformation of soil layers[J].Northwestern Seismological Journal,2009,31(1):8-14.(inChinese))
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