地震地区高速铁路桩基础设计考虑
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摘要
主要说明台湾高速铁路工程南部段自里程TK188至TK343长约155km松软冲积层中桩基础设计中几个需详细考虑的因素特殊地盘效应、群桩效应、桩帽侧向阻抗及土壤液化地层滑移等。同时利用前期桩载重试验结果探讨桩身向上土壤抗拉拔力与桩身向下土壤正摩擦力的比例。基本上桩基础分析属土壤与基桩互制的行为分析,本文也说明由试验结果所得到的土壤p-y,t-z及q-w曲线如何应用于桩基础设计及分析土壤弹簧对桩基础及桥柱设计的敏感度,以便将设计分析经验供今后类似工程参考。
The area of this study is in the southern part of THSR alignment from TK188 to TK343 with a length of 155 km approximately. The geological condition in this region consists of compressible alluvial deposits in the upper soil strata. This paper focuses on some of the special technical features to be considered in the design of pile foundations, including effects of particular site conditions, pile group effects, lateral resistance of pile cap and flow slide of liquefiable soil etc. For foundation design, significant efforts have been placed on soil-pile interaction (p-y, t-z and q-w relationships) through verification and calibration of models from pile load tests. The pullout resistance of piles is studied to a great extent based on full-scale pullout testing. Sensitivity of soil spring to the design of piles foundation and piers is also analyzed.
The area of this study is in the southern part of THSR alignment from TK188 to TK343 with a length of 155 km approximately. The geological condition in this region consists of compressible alluvial deposits in the upper soil strata. This paper focuses on some of the special technical features to be considered in the design of pile foundations, including effects of particular site conditions, pile group effects, lateral resistance of pile cap and flow slide of liquefiable soil etc. For foundation design, significant efforts have been placed on soil-pile interaction (p-y, t-z and q-w relationships) through verification and calibration of models from pile load tests. The pullout resistance of piles is studied to a great extent based on full-scale pullout testing. Sensitivity of soil spring to the design of piles foundation and piers is also analyzed.
引文
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[2]TaiwanHighSpeedRailCorporation(THSRC).DesignSpecification(Volume9)[S].Taipei,2000.
[3]ReeseL C.Analysis ofGroups ofPiles[A].深基础承受轴向力与侧向力的设计与计算机分析研讨会[C].台北,1994.
[4]范嘉程.承受横向力的群桩分析[J].地工技术,1997,(66):85-96.
[5]日本道路协会.道路桥示方书、同解说,Ⅳ下部构造编[S].东京,1996.
[6]CanadianGeotechnicalSociety.CanadianFoundationEngineeringManual,Part3,DeepFoundation[M].1978.
[7]AmericanAssociation ofStateHighway andTransportationOfficials(AASHTO).StandardSpecifications forHighwayBridges,16thEdition[S].1996.78-91.
[8]铁道总合技术研究所.铁道构造物等设计标准、同解说-基础构造物/抗土压构造物[S].丸善株式会社,日本东京,2000.213-214.
[9]HashashY M A,HookJ J,SchmidtB,YaoJ I -C.Seismic design and analysis of underground structures,Tunneling andUndergroundSpaceTechnology16[M].2001.247-293.
[10]铁道总合技术研究所.铁道构造物等设计标准、同解说-耐震设计[M].丸善株式会社,日本东京,1999.275-277.
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