局部液化区对地铁区间地震响应影响分析

发布时间：2018-09-13 07:39

【摘要】：为了研究局部液化区对邻近区间结构地震动力响应的影响,通过数值仿真模拟,分析区间隧道顶部存在局部液化区时区间隧道的动力响应规律,并针对设计过程中采用的增大管片配筋和增强纵向连接螺栓的抗液化措施进行探讨。经分析,局部液化区对邻近的隧道结构有较大影响,靠近液化区一侧隧道结构内力在地震液化工况下相比非地震液化工况时有显著增加;局部液化区对邻近隧道内力的影响范围沿隧道轴向约为3D(D为局部液化区的等效直径);隧道下穿局部液化区时,地震时隧道结构会发生上浮,但局部液化区对隧道结构位移影响不大;增大管片配筋和增强纵向连接螺栓刚度可以有效地控制管片内力,防止因内力过大引起的管片破坏。
[Abstract]:In order to study the influence of the local liquefaction zone on the seismic dynamic response of adjacent interval structures, the dynamic response law of the interval tunnel with the existence of local liquefaction zone at the top of the interval tunnel is analyzed by numerical simulation. The anti-liquefaction measures of reinforcing segment reinforcement and reinforcing longitudinal connection bolt are also discussed in the design process. According to the analysis, the local liquefaction zone has great influence on the adjacent tunnel structure, and the internal force of the tunnel structure near the liquefaction zone is significantly increased compared with the non-seismic liquefaction condition under the seismic liquefaction condition. The influence of the local liquefaction zone on the internal force of the adjacent tunnel is about 3D along the tunnel axis (D is the equivalent diameter of the local liquefaction zone), and when the tunnel passes through the local liquefaction zone, the tunnel structure will float when the earthquake occurs. However, the local liquefaction zone has little effect on the displacement of the tunnel structure, and increasing the reinforcement of the segment and the rigidity of the longitudinal connection bolt can effectively control the internal force of the segment and prevent the damage of the segment caused by the excessive internal force.
【作者单位】：铁道第三勘察设计院集团有限公司;
【分类号】：U231;U452.28

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