北京地铁新宫站基坑复合支护过渡部位的冗余度设计
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摘要
复合支护结构过渡部位中两种支护结构的水平刚度、受力方式、作用机理有所差异,故过渡部分是基坑安全控制的关键部位,对过渡部分进行冗余度的研究和优化具有非常实际的工程意义。论文结合北京地铁19号线新宫站基坑工程实例,通过数值模拟的方法,釆用MIDAS/GTS软件实现基坑的施工全过程模拟。在假定复合支护结构部分失效的情况下,以结构变形与受力情况为标准,对复合支护结构的冗余度进行了计算和优化设计。结果表明:(1)在出现支护结构局部破坏的情况下,复合支护体系的过渡部位桩体变形都出现了明显的增大;在有腰梁的情况下,桩体的变形得到了很好的控制;(2)出现局部破坏后,结构加入腰梁,增加了结构的传力路径,使整个结构的内力重分布更加均匀合理,可以有效地防止应力的集中,保证了结构的安全稳定;(3)在两种失效模式下,在支护结构之中加入腰梁对结构的冗余度都有明显的提升;混凝土腰梁对结构冗余度的优化效果要比钢腰梁好一些。在实际工程中,腰梁的加入对提升支护结构的稳定性和冗余度有着重要的意义,应注重对腰梁的设计应用。
Numerical simulation methods are used to simulate the whole process of construction of the foundation pit in the foundation pit project of the Xingong Station of Beijing Metro Line 19.Under the assumption that the composite support structure partially fails,the structural deformation and force conditions are taken as the criteria,and the redundancy of the composite support structure is calculated and optimized.The results show that(1) in the case of partial destruction of the supporting structure,the deformation of the piles at the transition section of the composite support system increases significantly;in the case of the waist beam,the deformation of the pile is well controlled.(2) After the partial damage occurs,the structure joins the waist beam,which increases the force transmission path of the structure,and the internal force redistribution of the entire structure is more uniform and reasonable,which can effectively prevent the stress concentration and ensure the safety and stability of the structure;(3) In the two failure modes,adding the waist beam to the support structure significant increases the structural redundancy,and the effect of theconcrete waist beam on the structural redundancy is better than that of the steel waist beam.In practical projects,the addition of waist beam is of important significance in improving the stability and redundancy of support structures,and the design and application of the waist beam should be emphasized.
Numerical simulation methods are used to simulate the whole process of construction of the foundation pit in the foundation pit project of the Xingong Station of Beijing Metro Line 19.Under the assumption that the composite support structure partially fails,the structural deformation and force conditions are taken as the criteria,and the redundancy of the composite support structure is calculated and optimized.The results show that(1) in the case of partial destruction of the supporting structure,the deformation of the piles at the transition section of the composite support system increases significantly;in the case of the waist beam,the deformation of the pile is well controlled.(2) After the partial damage occurs,the structure joins the waist beam,which increases the force transmission path of the structure,and the internal force redistribution of the entire structure is more uniform and reasonable,which can effectively prevent the stress concentration and ensure the safety and stability of the structure;(3) In the two failure modes,adding the waist beam to the support structure significant increases the structural redundancy,and the effect of theconcrete waist beam on the structural redundancy is better than that of the steel waist beam.In practical projects,the addition of waist beam is of important significance in improving the stability and redundancy of support structures,and the design and application of the waist beam should be emphasized.
引文
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[12]肖晓春,袁金荣,朱雁飞.新加坡地铁环线C824标段失事原因分析(一)---工程总体情况及事故发生过程[J].现代隧道技术,2009,46(5):66-72.[XIAO X C,YUAN J R,ZHU Y F.Causation analysis of the collapse on singapore MRT Circle Line Lot C824(part i)一project background and process of collapse[J].Modern Tunnelling Technology,2009,46(5):66-72.(in Chinese)]
[13]朱瑶宏,叶俊能,刘晓虎,等.宁波轨道交通地下连续墙深基坑工程变形特性及控制研究[J].水文地质工程地质,2012,39(4):66-74.[ZHU Y H,YE J N,LIU X H,et al.Deformation characteristics and control of foundation pits supporting with diaphgram wall in the Ningbo urban rail transit[J].Hydrogeology&Engineering Geology,2012,39(4):66-74.(in Chinese)]
[14]郑刚,程雪松,张雁.基坑环梁支撑结构的连续破坏模拟及冗余度研究[J].岩土工程学报,2014,36(1):105-117.[ZHENG G,CHENG X S,ZHANGY.Simulation of progressive collapse and redundancy of ring-beam supporting structures of excavations[J].Chinese Journal of Geotechnical Engineering,2014,36(1):105-117.(in Chinese)]
[15]DAN M F,CURLEY J P.Effects of damage and redundancy on structural reliability[J].Journal of Structural Engineering,1987,113(7):1533-1549.
[2]刘国彬,王卫东.基坑工程手册[M].2版.北京:中国建筑工业出版社,2009:13-17.[LIU G B,WANG W D.Foundation pit engineering manual[M].2nd ed.Beijing:China Architecture&Building Press,2009:13-17.(in Chinese)]
[3]李苏春,袁运涛.苏州凤凰国际书城基坑监测分析[J].水文地质工程地质,2013,40(1):129-133.[LI S C,YUAN Y T.Analysis of excavation monitoring for the Phoenix International Bookstore in Suzhou[J].Hydrogeology&Engineering Geology,2013,40(1):129-133.(in Chinese)]
[4]EL-TAWIL S,LI H,KUNNATH S.Computational simulation of gravity-induced progressive collapse of steel-frame buildings:current trends and future research needs[J].Journal of Structural Engineering,ASCE,2013,140(8):A2513001.
[5]蔡建国,王蜂岚,冯健.大跨空间结构抗连续性倒塌概念设计[J].建筑结构学报,2010(增刊1):283-287.[CAI J G,WANG F L,FENG J.Concept design of progressive collpse for long-span space structures[J].Journal of Building Structure,2010(Sup1):283-287.(in Chinese)]
[6]刘畅,李文杰,郭德强.基于冗余度的基坑支护体系数值模拟和优化设计[J].建筑技术,2016,47(9):781-784.[LIU C,LI W J,GUO D Q.Numerical simulation and optimization design of foundation pit support system based on redundancy[J].Architecture Technology,2016,47(9):781-784.(in Chinese)]
[7]张飞,李镜培,唐耀.考虑土体硬化的基坑开挖性状及隆起稳定性分析[J].水文地质工程地质,2012,39(2):79-84.[ZHANG F,LI J P,TANGY.Investigation of excavation characters and basal stability with considering soil hardening behavior[J].Hydrogeology&Engineering Geology,2012,39(2):79-84.(in Chinese)]
[8]王笃礼,刘北宁,沈宇鹏.北京某基坑阳角部位土钉支护的冗余度设计研究[J].岩土工程技术,2017,31(5):229-235.[WANG D L,LIU B N,SHEN Y P.Study on redundancy design of soil nailing retaining in the external angle of a foundation pit in Beijing[J].Geotechnical Engineering Technique,2017,31(5):229-235.(in Chinese)]
[9]王海旭,程雪松,郑刚.土钉支护基坑阳角的冗余度研究[J].施工技术,2011,40(24):37-42.[WANG H X,CHENG X S,ZHENG G.Study on redundancy of foundation excavation convex location supported by soil nailing[J].Construction Technology,2011,40(24):37-42.(in Chinese)]
[10]方召欣.基于消能观点的结构鲁棒性分析与实现[D].武汉:华中科技大学,2008.[FANG Z X.Analysis and realization of structural robustness in the light of energy-absorption of structures[D].Wuhan:Huazhong University of Science and Technology,2008.(in Chinese)]
[11]郑刚,焦莹.深基坑工程设计理论及工程应用[M].北京:中国建筑工业出版社,2010:52-59.[ZHENG G,JIAO Y.Deep foundation pit engineering design theory and engineering application[M].Beijing:China Architecture&Building Press,2010:52-59.(in Chinese)]
[12]肖晓春,袁金荣,朱雁飞.新加坡地铁环线C824标段失事原因分析(一)---工程总体情况及事故发生过程[J].现代隧道技术,2009,46(5):66-72.[XIAO X C,YUAN J R,ZHU Y F.Causation analysis of the collapse on singapore MRT Circle Line Lot C824(part i)一project background and process of collapse[J].Modern Tunnelling Technology,2009,46(5):66-72.(in Chinese)]
[13]朱瑶宏,叶俊能,刘晓虎,等.宁波轨道交通地下连续墙深基坑工程变形特性及控制研究[J].水文地质工程地质,2012,39(4):66-74.[ZHU Y H,YE J N,LIU X H,et al.Deformation characteristics and control of foundation pits supporting with diaphgram wall in the Ningbo urban rail transit[J].Hydrogeology&Engineering Geology,2012,39(4):66-74.(in Chinese)]
[14]郑刚,程雪松,张雁.基坑环梁支撑结构的连续破坏模拟及冗余度研究[J].岩土工程学报,2014,36(1):105-117.[ZHENG G,CHENG X S,ZHANGY.Simulation of progressive collapse and redundancy of ring-beam supporting structures of excavations[J].Chinese Journal of Geotechnical Engineering,2014,36(1):105-117.(in Chinese)]
[15]DAN M F,CURLEY J P.Effects of damage and redundancy on structural reliability[J].Journal of Structural Engineering,1987,113(7):1533-1549.
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