钻孔灌注桩施工对邻近桥桩基影响的数值模拟
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摘要
采用三维数值模拟的方法,对新建桥梁的钻孔灌注桩的施工工程进行计算,预测了其在各步序施工条件下对周围土体应力和变形的影响,并对各施工步序对邻近桩基应力变形的影响进行了分析。结果表明:(1)新建桥台的施工,对既有桥桩的位移和既有桥桩结构的应力有一定影响;(2)各个施工步序对地层应力位移影响较大,基坑下部土体挤入较为严重,特别是靠近既有桥桩的基坑下部挤入值较大;(3)其中第1施工步序和第3施工步序对既有桥桩的应力影响相对于其他步骤较大;(4)在考虑桩基施工对周围土体扰动的情况下,桩基施工对既有桥桩的沉降影响不大。施工建议为:(1)第1施工步序和第3施工步序是核心风险源,需要特别注意施工安全风险;(2)对既有桥桩结构周围土体进行注浆加固;(3)在允许的情况下,提高挡土墙结构和横撑的强度;(4)建立监测预警系统,进行信息化管理。
Based on the construction engineering of bored cast-in-place piles of a new bridge,by using FEM simulation,the influence of surrounding soil stress and deformation under step construction condition is predicted,and the influence of steps of the construction sequence on stress deformation of adjacent piles are analysed.The result shows that(1) new abutment construction has a certain influence on the displacement and the structure stress of the existing bridge piles;(2) the influence of construction steps on stress and displacement of stratum is strong,the squeezing of lower part of foundation pit soil is remarkable,particularly the squeezing value near the lower part of existing bridge piles is larger;(3) the effect of the first step and the third step of construction on the stress of existing bridge piles is relatively larger to the other steps;(4) in consideration of disturbance of pile foundation construction process on the surrounding soil,pile foundation construction has little effect on the settlement of existing bridge piles.It is suggested that(1) the first step and third step is the core source of risk,which need to be paid special attention to construction safety risk;(2) to grout the surrounding soil of existing bridge piles;(3)to improve the strength of retaining wall structure and transverse braces in the allowed circumstance;(4) to build monitoring and warning system for information management.
Based on the construction engineering of bored cast-in-place piles of a new bridge,by using FEM simulation,the influence of surrounding soil stress and deformation under step construction condition is predicted,and the influence of steps of the construction sequence on stress deformation of adjacent piles are analysed.The result shows that(1) new abutment construction has a certain influence on the displacement and the structure stress of the existing bridge piles;(2) the influence of construction steps on stress and displacement of stratum is strong,the squeezing of lower part of foundation pit soil is remarkable,particularly the squeezing value near the lower part of existing bridge piles is larger;(3) the effect of the first step and the third step of construction on the stress of existing bridge piles is relatively larger to the other steps;(4) in consideration of disturbance of pile foundation construction process on the surrounding soil,pile foundation construction has little effect on the settlement of existing bridge piles.It is suggested that(1) the first step and third step is the core source of risk,which need to be paid special attention to construction safety risk;(2) to grout the surrounding soil of existing bridge piles;(3)to improve the strength of retaining wall structure and transverse braces in the allowed circumstance;(4) to build monitoring and warning system for information management.
引文
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[2]PULLER M.Deep Excavation[M].London:TomasTelford Publishing,1996.
[3]秦四清.深基坑工程优化设计[M].北京:地震出版社,1998.QIN Siqing.Deep Excavation Engineering OptimizationDesign[M].Beijing:Earthquake Press,1998.
[4]刘登攀,刘国彬.邻近建筑物对某基坑变形影响的分析[J].岩土工程技术,2007,2l(1):28-31,45.LIUDengpan,LIUGuobin.Analysis of the AdjacentBuilding Influence on Foundation Pit Deformation[J].Geotechnical Engineering Technique,2007,21(1):28-31,45.
[5]丁振明,秦四清,刘军,等.土钉支护体系抗拔力机理研究[J].岩土力学,2005,26(11):1799-1802.DING Zhenming,QIN Siqing,LIU Jun,et al.Researchon Anti-pulling Mechanism in Soil-nailing SupportingSystem[J].Rock and Soil Mechanics,2005,26(11):1799-1802.
[6]丁振明,刘军,秦四清.土钉复合预应力锚索在深基坑支护工程中的应用[C]∥中国岩土锚固工程协会第十五次全国岩土锚固工程学术研讨会论文集.北京:人民交通出版社,2006:364-368.DING Zhenming,LIU Jun,QIN Siqing.Application ofSoil Nail Composite Prestressed Anchor in DeepFoundation Pit Support Engineering[C]∥Proceedings of15th National Symposium on Geotechnical AnchorageEngineering,China Geotechnical Anchorage EngineeringAssociation.Beijing:China Communications Press,2006:364-368.
[7]丁振明.土钉支护现场应力测试分析[J].工程勘察,2006(11):65-67.DING Zhenming.The Analysis on Forces of Soil-nailingSupporting System via In-situ Test[J].Journal ofGeotechnical Investigation&Surveying,2006(11):65-67.
[8]BOONE S J,WESTLAND J,NUSINK R.SeismicResponse of Reinforced Concrete Buildings Close to DeepExcavation[J].Canadian Geotechnical Journal,1999,36(2):210-223.
[9]李龙剑,杨宏伟,李政林,等.基坑开挖对邻近桥梁桩基的影响分析[J].地下空间与工程学报,2011,7(增2):1697-1701.LI Longjian,YANG Hongwei,LI Zhenglin,et al.Numerical Analysis of the Influence of UnsupportedExcavation on Adjacent Viaduct Foundation[J].ChineseJournal of Underground Space and Engineering,2011,7(S2):1697-1701.
[10]王翠,闫澍旺,张启斌.深基坑开挖对邻近桥桩的影响机制及控制措施研究[J].岩石力学与工程学报,2010,29(增1):2994-3000.WANG Cui,YAN Shuwang,ZHANG Qibin.Study ofInfluence of Deep PIT Excavation on Adjacent BridgeFoundation Plies[J].Chinese Journal of Rock Mechanicsand Engineering,2010,29(增1):2994-3000.
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