动力离心模型试验中微混凝土抗滑模型桩的设计
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摘要
利用动力离心模型试验研究分析了地震条件下抗滑桩加固边坡的稳定性。通过试验找出了一种合适的微混凝土配合比,基于模型相似比尺理论研制出了4种不同桩径的微混凝土抗滑模型桩,根据相似比尺关系换算出了所能模拟的50倍原型桩的抗弯承载能力。进行了两个动力离心模型试验。试验表明:研制的微混凝土桩抗弯承载力可以在离心机加速度为50 g条件下再现抗滑桩的静力破坏或动力稳定等一系列动力响应特征。这说明原型材料模型桩能够有效地用于揭示弹性动力响应以及破坏现象。
The dynamic response and bending failure of stabilizing concrete piles used to stabilize slopes during earthquake were analyzed in centrifuge tests using model piles.The design used a variety of mixture proportions with the compressive and moment strength measured in the laboratory.Modeling scale laws were used to select four kinds of model concrete stabilizing piles.According to modeling scale laws,the corresponding moment compressive strength of the prototype piles 50 times the model piles in section dimension was deduced and validated. Then,two dynamic centrifuge tests were performed on a soil slope reinforced with model concrete piles.The results of one test revealed a crack failure of piles with smaller cross sections during static and dynamic conditions while the other tests with the acceleration of 50 g verified the stabilizing effect and elastic dynamic response of piles with larger cross sections during earthquakes.
The dynamic response and bending failure of stabilizing concrete piles used to stabilize slopes during earthquake were analyzed in centrifuge tests using model piles.The design used a variety of mixture proportions with the compressive and moment strength measured in the laboratory.Modeling scale laws were used to select four kinds of model concrete stabilizing piles.According to modeling scale laws,the corresponding moment compressive strength of the prototype piles 50 times the model piles in section dimension was deduced and validated. Then,two dynamic centrifuge tests were performed on a soil slope reinforced with model concrete piles.The results of one test revealed a crack failure of piles with smaller cross sections during static and dynamic conditions while the other tests with the acceleration of 50 g verified the stabilizing effect and elastic dynamic response of piles with larger cross sections during earthquakes.
引文
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[2]苏栋,李相菘.可液化土中单桩地震响应的离心机试验研究[J].岩土工程学报,2006,28(4):423-427.SU Dong,LI Xiangsong.Centrifuge investigation on seismicresponse of single pile in liquefiable soil[J].Chinese JGeotech Eng,2006,28(4):423-427.(in Chinese)
[3]汪明武,Tbbita Tetsuo,Iai Susumu.强震动条件下的桩土相互作用动态土工离心试验研究[J].岩石力学与工程学报,2005,24(s2):5555-5560.WANG Mingwu,Tobita Tetsuo,Iai Susumu.Centrifugemodeling of soil pile interaction in liquefiable soil subjectedstrong motion[J].Rock Mech and Eng,2005,24(S2):5555-5560.(in Chinese)
[4]于玉贞,邓丽军.抗滑桩加固边坡地震响应离心模型试验[J].岩土工程学报,2007,29(9):1320-1323.YU Yuzhen,DENG Lijun.Centrifuge modeling of seismicbehavior of slope reinforced by stabilizing pile[J].Chinese JGeotech Eng,2007,29(9):1320-1323.(in Chinese)
[5]Sabnis G M,Harris H G,White R N,et al.StructuralModeling and Experimental Techniques[M].Upper SaddleRiver,NJ:Prentice-Hall,1983.
[6]杨俊杰.相似理论与结构模型试验[M].武汉:武汉理工大学出版社,2005.
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