大型渡槽桩土相互作用振动台试验研究
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摘要
为了对南水北调中线工程中的洺河大型渡槽下部结构型式及优化设计各备选方案进行初步的评估,总结其地震反应的规律,获得必要的动力反应设计参数,分别对等长桩、不等长桩以及旋喷加固等长桩进行了振动台试验研究。根据所得试验数据,对等长桩和不等长桩2种不同设计方案下的动力反应特性进行了分析,对使用旋喷加固方法对桩基动力反应的影响进行了初步的判断,并对试验中使用的木-橡胶模型箱进行了评估。试验结果表明:采用长短桩设计方案比不等长桩更具优越性;使用旋喷加固方法能在一定程度上提高桩基动力反应的安全性;试验中所使用的木-橡胶模型箱在土的边界模拟上是合理和可行的。
Shaking table tests were carried out for Minghe River Aqueduct in South-to-North Water Diversion Central Line Project.Based on the data of the tests,dynamic response characteristics were analyzed for two different design alternatives,which were equal length pile foundation and Unequal length pile foundation.The effect was initially estimated on the dynamic response of pile foundation when circle spray reinforcement was used.And wood-rubber model box was objectively evaluated in the tests.It is shown that unequal length pile design alternative is more appropriate than equal length pile.Moreover,circle spray reinforcement can improve the behavior of dynamic response of pile foundation and wood-rubber model box is rational and feasible.
Shaking table tests were carried out for Minghe River Aqueduct in South-to-North Water Diversion Central Line Project.Based on the data of the tests,dynamic response characteristics were analyzed for two different design alternatives,which were equal length pile foundation and Unequal length pile foundation.The effect was initially estimated on the dynamic response of pile foundation when circle spray reinforcement was used.And wood-rubber model box was objectively evaluated in the tests.It is shown that unequal length pile design alternative is more appropriate than equal length pile.Moreover,circle spray reinforcement can improve the behavior of dynamic response of pile foundation and wood-rubber model box is rational and feasible.
引文
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[18]GB 50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001
[2]来弘鹏,谢永利,杨晓华.公路隧道衬砌断面型式模型试验研究[J].岩土工程学报,2006,28(6):740-744.LAI HONG-PENG,XIE YONG-LI,YANG XIAO-HUA.Model test study on sectional form of highwaytunnel lining[J].Chinese Journal of GeotechniealEngineering,2006,28(6):740-744.
[3]SHI X J,WU H Y,CHEN J,et a1.Design of laminarshear box with openings for shaking table test andexperimental verification[C]//International Symposiumon Innovation and Sustainability of Structures in CivilEngineering,ISISS’2007:Vo1.2,Shanghai,China:798-806.
[4]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,LV HE,et a1.Dynamic centrifuge test of slope reinforced with coppermodel piles[J].Hydrogeology and EngineeringGeology,2008,35(5):41-44.
[5]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 investigationon seismic response of single pile in liquefiable soil[J].Chinese Journal of Geotechnical Engineering,2006,28(4),423-427.
[6]BARDET J P,IDRISS I M,ROURKE T D O,et al.North America-Japan Workshop on the GeotechnicalAspects of the Kobe,Loma Prieta and NorthridgeEarthquakes[M].Department of Civil Engineering,University of Southern California,February,1997,38-43.
[7]YAO S,KOBAYASHI K,YOSHIDA N,et al.Interactive behavior of soil-pile-superstructure system intransient state to liquefaction by means of large shaketable tests[J].Soil Dynamics and EarthquakeEngineering,2004,24:397-409.
[8]SU D.Centrifuge investigation on responses of sanddeposit and sand-pile system under multi-directionalearthquake loading[D].Hong Kong:The Hong KongUniversity of Science and Technology,2005.
[9]KNAPPETF J A,MADABHUSHI S P G.Modelling ofliquefaction-induced instability in pile groups[J].Geotechnical Special Publication,2006,145:255-267.
[10]WANG H B,LI D Y.Experimental study of dynamicdamage of an arch dam[J].Earthquake Engineering andStructural Dynamics,2007,36(3):347-366.
[11]范书立.混凝土重力坝的动力模型破坏试验及可靠性研究[D].大连:大连理工大学,2007.
[12]朱长安,高波,索然绪.强震区隧道洞口段振动台模型试验研究[J].现代隧道技术,2008,45(1):48-52.HU CHAN-AN,GAO BO,SUO RAN-XU.Shakingtable test for portal section of atunnelin high-intensityseismic region[J].Modem Tunnel Technology,2008,45(1):48-52.
[13]冯士伦,王建华.海洋平台桩基的振动台模型试验研究[J].岩石力学与工程学报,2006,25(S1),3229-3234.FENG SHI-LUN,WANG JIAN-HUA.Shake tablemodel test on pile foundation of offshore platforms[J].Chinese Journal of Rock Mechanics and Engineering,2006,25(S1),3229-3234.
[14]JTJ 004-89公路工程抗震设计规范[S].北京:人民交通出版社,1990.
[15]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.
[16]李培振.结构—地基动力相互作用体系的振动台试验及计算模拟分析[D].上海:同济大学土木工程防灾国家重点实验室,2002.
[17]PRASAD S K,TOWHATA I.Shaking table tests inearhquake geotechnical engineering[J].Current Science,2004,87(10):1398-1404
[18]GB 50011-2001建筑抗震设计规范[S].北京:中国建筑工业出版社,2001
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