南京某直墙隧道抗震性能研究
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摘要
为了研究南京某公路直墙隧道的地震反应,综合其土体条件差异较大或结构断面形式不同等特性,选取3个典型断面,利用ABAQUS软件进行地震反应分析,分析了结构断面在不同地震强度下的相对水平位移极值、应力水平,结果表明:该隧道软土区结构地震位移反应明显大于硬土区,且地震波动力特性对软土区隧道地震反应影响较大;硬土区隧道在各指定强度地震下墙体均处于弹性变形状态,软土区隧道在E2地震下墙体轻微塑性变形,E3地震下塑性变形较大;不同结构形式共同的应力集中区域为箱涵拱肩和中墙端部,当存在附属结构时,其附属结构周围应力集中区域明显不同。
In order to study the seismic response of road tunnel with straight wall in Nanjing city,three typical sections were analyzed using software ABAQUS by comprehensively considering the differences of the soil distribution and the structural section. The horizontal relative displacements and stresses of structural sections on different seismic intensity were calculated. Results showed that the seismic displacement response of structural section in soft soil was obviously larger than that in stiff soil,and the dynamic characteristics of seismic wave had greater impact on the seismic response of tunnel in soft soil. It can be concluded that walls of tunnels in stiff soil remained elastic deformation in all defined intensity ground motions,and slight plastic deformation occurred in moderate intensity ground motions and comparatively large plastic deformation happened in high intensity ground motions on walls of tunnels in soft soil. The research showed that the spandrel and ends of middle walls in box culvert were the common stress concentration zones in different structures,whereas the stress concentration zone differed around attachment structure.
In order to study the seismic response of road tunnel with straight wall in Nanjing city,three typical sections were analyzed using software ABAQUS by comprehensively considering the differences of the soil distribution and the structural section. The horizontal relative displacements and stresses of structural sections on different seismic intensity were calculated. Results showed that the seismic displacement response of structural section in soft soil was obviously larger than that in stiff soil,and the dynamic characteristics of seismic wave had greater impact on the seismic response of tunnel in soft soil. It can be concluded that walls of tunnels in stiff soil remained elastic deformation in all defined intensity ground motions,and slight plastic deformation occurred in moderate intensity ground motions and comparatively large plastic deformation happened in high intensity ground motions on walls of tunnels in soft soil. The research showed that the spandrel and ends of middle walls in box culvert were the common stress concentration zones in different structures,whereas the stress concentration zone differed around attachment structure.
引文
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[12]陈磊,陈国兴,龙慧.地铁交叉隧道近场强地震反应特性的三维精细化非线性有限元分析[J].岩土力学,2010,31(12):3971-3976.
[2]Shahrour I,Khoshnoudian F,Sadek M,et al.Elastoplastic analysis of the seismic response of tunnels in soft soils[J].Tunnelling and Underground Space Technology,2010,25:478-482.
[3]张丹.浅埋隧道衬砌结构抗震计算方法分析[D].成都:西南交通大学,2012.
[4]刘晶波,王文晖,赵冬冬.地下结构地震反应计算反应位移法的改进[J].土木建筑与环境工程,2010,32(增):211-213.
[5]王峥峥,檀永刚,张哲,等.基于损伤和能量指标的隧道结构地震反应分析[J].大连理工大学学报,2011,51(6):861-867.
[6]庄海洋,陈国兴.双洞单轨地铁区间隧道非线性地震反应分析[J].地震工程与工程振动,2006,26(2):131-137.
[7]左熹,陈国兴,庄海洋.圆形和直墙拱形地下隧道地震反应数值模拟对比分析[J].防灾减灾工程学报,2007,27(4):401-406.
[8]Debiasi E,Gajo A,Zonta D.On the seismic response of shallowburied rectangular structures[J].Tunnelling and Underground Space Technology,2013,38:99-113.
[9]刘晶波,杜义欣,闫秋实.黏弹性人工边界及地震动输入在通用有限元软件中的实现[J].防灾减灾工程学报,2007,27(增):37-42.
[10]高峰,赵冯兵.地下结构静-动力分析中的人工边界转换方法研究[J].振动与冲击,2011,30(11):165-170.
[11]小泉淳,张稳军,袁大军.盾构隧道的抗震研究及算例[M].北京:中国建筑工业出版社,2009.
[12]陈磊,陈国兴,龙慧.地铁交叉隧道近场强地震反应特性的三维精细化非线性有限元分析[J].岩土力学,2010,31(12):3971-3976.
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