饱和砂土地基上抗滑桩加固边坡的动力离心模型试验研究
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摘要
动力离心模型试验是研究可液化地基上抗滑桩加固边坡地震动力响应的有效手段之一。使用铜质抗滑模型桩,采用黏度为50cs的甲基硅油做为孔隙流体,通过抽真空法制作了饱和地基上的加固边坡模型。进行动力离心模型试验,研究了地震作用下饱和砂土地基中动孔压、边坡变形与土体加速度和抗滑桩弯矩的响应特征。试验结果表明,地震作用导致的动力附加弯矩相当于震前静力弯矩的87%,说明地震作用与地基液化导致的附加弯矩不容忽视,该结论可为边坡进行抗震设计与稳定分析提供有意义的参考。
By using the copper model piles and silicon oil instead of water,the centrifuge modeling dynamic response of soil slope reinforced with one row of piles on saturated foundation during earthquake was conducted.Based on the test results,the characteristics of the seismic response of pore pressure in foundation,acceleration in soil and moment in piles during earthquake were investigated.According to the observation and analysis,it can be concluded that the accumulation of excess pore pressure in saturated sand foundation,especially liquefaction not only makes the bending moment of pile increase as much as 87 % but also weakens the acceleration response in the slope.
By using the copper model piles and silicon oil instead of water,the centrifuge modeling dynamic response of soil slope reinforced with one row of piles on saturated foundation during earthquake was conducted.Based on the test results,the characteristics of the seismic response of pore pressure in foundation,acceleration in soil and moment in piles during earthquake were investigated.According to the observation and analysis,it can be concluded that the accumulation of excess pore pressure in saturated sand foundation,especially liquefaction not only makes the bending moment of pile increase as much as 87 % but also weakens the acceleration response in the slope.
引文
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[11]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 Yu-zhen,DENG Li-jun.Centrifuge modeling of seismic behavior of slope reinforced by stabilizing pile[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1320-1323.
[12]于玉贞,李荣建,吕禾,等.铜质模型桩加固边坡的动力离心试验[J].水文地质工程地质,2008,35(5):41-44.YU Yu-zhen,LI Rong-jian,LU He,et al.Dynamic centrifuge test of slope reinforced with copper model piles[J].Hydrogeology and Engineering Geology,2008,35(5):41-44.
[2]TAJI Y,SATO M,YANAGISAWA E.Modeling of a prototype soil-pile-structure system during seismic ground liquefaction[C]//Centrifuge98.Kimura,Kusakabe,Takemura,eds.Rotterdam:A A Balkema,1998:283-288.
[3]TAKAHASHI A,TAKEMURA J,KAWAGUCHI Y,et al.Stability of piled pier subjected to lateral flow of soils during earthquake[C]//Centrifuge98.Kimura,Kusakabe,Takemura,eds.Rotterdam:A A Balkema,1998:365-370.
[4]FINN W D L,FUJITA N.Piles in liquefiable soils:seismic analysis and design issues[J].Soil Dynamics and Earthquake Engineering,2002,22(9-12):731-742.
[5]ABDOUN T,DOBRY R.Pile response to lateral spreads:centrifuge modeling[J].Journal of Geotechnical and Geoenvironmental Engineering,2003,129(10):869-878.
[6]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 Xiang-song.Centrifuge investigation on seismic response of single pile in liquefiable soil[J].Chinese Journal of Geotechnical Engineering,2006,28(4):423-427.
[7]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(增2):5555-5560.WANG Ming-wu,TOBITA Tetsuo,IAI Susumu.Centrifuge modeling of soil pile interaction in liquefiable soil subjected strong motion[J].Chinese Journal of Rock Mechanics and Engineering,2005,24(Supp.2):5555-5560.
[8]刘光磊,宋二祥,刘华北,等.饱和砂土地层中隧道结构动力离心模型试验[J].岩土力学,2008,29(8):2070-2076.LIU Guang-lei,SONG Er-xiang,LIU Hua-bei,et al.Dynamic centrifuge tests on seismic response of tunnel in saturated sandy foundation[J].Rock and Soil Mechanics,2008,29(8):2070-2076.
[9]苏栋,李相菘.水平多向荷载下桩-土相互作用初探[J].岩土力学,2008,29(3):603-608.SU Dong,LI Xiang-song.Preliminary study on soil-pile interaction under multidirectional horizontal loading[J].Rock and Soil Mechanics,2008,29(3):603-608.
[10]SATOH H,OHBO N,YOSHIZAKO K.Dynamic test on behavior of pile during lateral ground flow[C]//Centrifuge98.Kimura,Kusakabe,Takemura,eds.Rotterdam:A A Balkema,1998:327-332.
[11]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 Yu-zhen,DENG Li-jun.Centrifuge modeling of seismic behavior of slope reinforced by stabilizing pile[J].Chinese Journal of Geotechnical Engineering,2007,29(9):1320-1323.
[12]于玉贞,李荣建,吕禾,等.铜质模型桩加固边坡的动力离心试验[J].水文地质工程地质,2008,35(5):41-44.YU Yu-zhen,LI Rong-jian,LU He,et al.Dynamic centrifuge test of slope reinforced with copper model piles[J].Hydrogeology and Engineering Geology,2008,35(5):41-44.
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