高烈度地震区抗滑桩锚固深度可靠度分析
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摘要
在高烈度地震区,地震作用对抗滑桩的影响并没有引起人们的足够重视,这将大大降低工程运行可靠度。针对地震区抗滑桩设计,对影响锚固深度的容许侧应力进行地震角修正,建立地震作用下的抗滑桩侧应力计算模型,确定承载能力极限状态下的侧应力功能函数,把桩周岩土介质参数、桩体结构强度和地震作用等作为随机变量,采用一次二阶矩法,进行可靠性指标计算。通过工程实例,得出在一定锚固深度下,岩土参数变异性、考虑和不考虑地震作用条件下对抗滑桩可靠度的影响,获得高烈度地震区抗滑桩设计中的锚固深度取值标准,并提出抗滑桩设计以可靠度法设计指导定值法设计的新思路。
The effect of seismic action on anti-sliding pile in high-intensity earthquake region has not attracted enough attentions,which will reduce the reliability in project operation greatly.In connection with the design of anti-sliding pile in earthquake region,seismic angle correction is carried out against the allowable lateral stress affecting the anchoring depth to establish the model calculating lateral stress on anti-sliding pile under seismic action and determine the function of the lateral stress in the state of ultimate bearing capacity.Taking parameters of geo-materials surrounding pile,structural strength of pile body and seismic action as random variables,and by use of FOSM method,the index of reliability is calculated.Through case study,under certain anchoring depth,either the effect of soil parameter's variety or the conditions with or without the consideration of seismic action on anti-sliding pile's reliability can be known,the valuing standard of anchoring depth in the design of anti-sliding pile in high-intensity earthquake region can be obtained,and the new idea taking reliability as the guidance of valuation in design of anti-sliding pile is proposed.
The effect of seismic action on anti-sliding pile in high-intensity earthquake region has not attracted enough attentions,which will reduce the reliability in project operation greatly.In connection with the design of anti-sliding pile in earthquake region,seismic angle correction is carried out against the allowable lateral stress affecting the anchoring depth to establish the model calculating lateral stress on anti-sliding pile under seismic action and determine the function of the lateral stress in the state of ultimate bearing capacity.Taking parameters of geo-materials surrounding pile,structural strength of pile body and seismic action as random variables,and by use of FOSM method,the index of reliability is calculated.Through case study,under certain anchoring depth,either the effect of soil parameter's variety or the conditions with or without the consideration of seismic action on anti-sliding pile's reliability can be known,the valuing standard of anchoring depth in the design of anti-sliding pile in high-intensity earthquake region can be obtained,and the new idea taking reliability as the guidance of valuation in design of anti-sliding pile is proposed.
引文
[1]吴永,何思明,李新坡.地震波作用下抗滑桩的失效机理[J].四川大学学报:工程科学版,2009,41(3):284-288.
[2]年廷凯,栾茂田,郑德凤,崔春义.抗滑桩锚固深度的极限分析下限方法[J].水利学报,2007,38(6):743-748.
[3]叶海林,郑颖人,黄润秋,杜修力,李安洪,许江波.强度折减动力分析法在滑坡抗滑桩抗震设计中的应用研究[J].岩土力学,2010,31(增刊1):317-322.
[4]罗渝,何思明,何尽川.地震作用下抗滑桩作用机制研究[J].长江科学院院报,2010,27(6):26-29.
[5]胡晓军,吴延枝.抗滑桩锚固深度的可靠性与参数敏感性[J].河海大学学报:自然科学版,2011,39(1):49-52.
[6]张文居,赵其华,刘晶晶.抗滑桩锚固深度的可靠性设计[J].岩土工程学报,2006,28(12):2153-2155.
[7]刘剑光,徐骏.埋入式抗滑桩优化设计的数值模拟分析[J].路基工程,2009(3):40-41.
[8]陈新泽,唐辉明,杨有成.抗滑桩加固边坡优化探讨[J].路基工程,2008(4):46-48.
[9]李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2011.
[10]铁道部第二勘测设计院科学技术研究所.抗滑桩设计与计算[M].北京:中国铁道出版社,1981.
[11]GB50111-2006铁路工程抗震设计规范(2009年版)[S].北京:中国计划出版社,2009.
[12]张璐璐,张洁,徐耀,李旭.岩土工程可靠度理论[M].上海:同济大学出版社,2011.
[13]GB50153-2008工程结构可靠性设计统一标准[S].北京:中国建筑工业出版社,2008.
[2]年廷凯,栾茂田,郑德凤,崔春义.抗滑桩锚固深度的极限分析下限方法[J].水利学报,2007,38(6):743-748.
[3]叶海林,郑颖人,黄润秋,杜修力,李安洪,许江波.强度折减动力分析法在滑坡抗滑桩抗震设计中的应用研究[J].岩土力学,2010,31(增刊1):317-322.
[4]罗渝,何思明,何尽川.地震作用下抗滑桩作用机制研究[J].长江科学院院报,2010,27(6):26-29.
[5]胡晓军,吴延枝.抗滑桩锚固深度的可靠性与参数敏感性[J].河海大学学报:自然科学版,2011,39(1):49-52.
[6]张文居,赵其华,刘晶晶.抗滑桩锚固深度的可靠性设计[J].岩土工程学报,2006,28(12):2153-2155.
[7]刘剑光,徐骏.埋入式抗滑桩优化设计的数值模拟分析[J].路基工程,2009(3):40-41.
[8]陈新泽,唐辉明,杨有成.抗滑桩加固边坡优化探讨[J].路基工程,2008(4):46-48.
[9]李海光.新型支挡结构设计与工程实例[M].北京:人民交通出版社,2011.
[10]铁道部第二勘测设计院科学技术研究所.抗滑桩设计与计算[M].北京:中国铁道出版社,1981.
[11]GB50111-2006铁路工程抗震设计规范(2009年版)[S].北京:中国计划出版社,2009.
[12]张璐璐,张洁,徐耀,李旭.岩土工程可靠度理论[M].上海:同济大学出版社,2011.
[13]GB50153-2008工程结构可靠性设计统一标准[S].北京:中国建筑工业出版社,2008.
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