隧道穿越活动断层段是地震中破坏最为严重的区域之一。针对这一现象，基于主动防御的设计理念，提出一种钢筋和橡胶相结合的柔性接头措施。以穿越断层龙溪隧道工程为背景，采用振动台模型试验研究了断层错动-震动综合加载方式下带有接头的衬砌结构响应特征。分析结果证明：断层错动-震动联合作用下分段隧道对周围模型土层有追随性和依赖性；断层错动-震动联合作用下，该接头的设置不改变衬砌结构的加速度响应特征，但是由于自身的变形协调性有效地减小了穿越断层区域衬砌的加速度响应；提出的接头有效地减少了地震造成的剪切破坏，阻隔了节段间力的传递，使衬砌破坏局部化，衬砌破坏主要集中在断层附近区域。
Abstract
Tunnel crossing active fault segment is one of the most seriously damaged zones in earthquake. Here, aiming at this phenomenon, based on the design concept of active defense, a flexible joint measure combining steel bar and rubber was proposed. Relying on Longxi tunnel crossing fault, dynamic response characteristics of lining structure with joints under fault dislocation and earthquake combined loading mode were studied with shaking table model tests. The analysis results showed that under the combined action of fault dislocation and earthquake, segmented tunnel has following ability and dependence upon surrounding model soil layer; under the combined action of fault dislocation and earthquake, joint setting does not change acceleration response characteristics of lining structure, but effectively reduces acceleration response of cross fault zone lining due to its own deformation compatibility; the proposed joint can effectively reduce shear failure caused by earthquake and block force transmission between segments to localize lining failure, and lining failure is mainly concentrated in area near fault.
关键词
隧道工程 /
接头 /
地震响应特征 /
断层 /
振动台试验
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Key words
tunnel engineering /
joint /
seismic response characteristics /
fault /
shaking table test
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