罕遇地震隧道动力学洞口段二衬防垮塌抗震配筋技术

发布时间：2018-09-10 15:56

【摘要】：为改变隧道洞口段抗震"大震偏弱"的现状,引入了二衬防垮塌单层配筋抗震技术,与传统的双层配筋抗震技术相配合,共同进行隧道动力学洞口段的抗震设防设计。根据公路和铁路隧道现行抗震规范规定,提出了隧道动力学洞口段二衬防垮塌抗震配筋准则,并利用有限差分数值模拟技术研究了防垮塌抗震配筋适用范围,研究结果表明:设防烈度7度情况下,洞口浅埋段采用单层配筋抗震技术,洞口影响过渡段不需采取抗震设防措施;设防烈度8度情况下,洞口浅埋段采用双层配筋抗震技术,洞口影响过渡段采用单层配筋抗震技术;设防烈度9度况下,洞口浅埋段和洞口影响过渡段均采用双层配筋抗震技术进行抗震设防。研究成果对隧道动力学洞口段抗震技术的发展具有重要的意义。
[Abstract]:In order to change the present situation of "strong earthquake is weak" in tunnel entrance section, the anti-seismic technology of two-lining anti-collapse single-layer reinforcement is introduced, and the seismic fortification design of dynamic tunnel entrance section is carried out together with the traditional double-layer reinforcement anti-seismic technology. According to the current seismic code of highway and railway tunnel, the criterion of anti-collapse and anti-seismic reinforcement of two-lining in tunnel dynamic opening section is put forward, and the applicable range of anti-collapse anti-seismic reinforcement is studied by using finite difference numerical simulation technology. The results show that when the fortification intensity is 7 degrees, the single-layer reinforced seismic technique is used in the shallow buried section of the opening, and no seismic fortification measures need to be taken in the transition section affected by the opening, and the double-layer reinforcement anti-seismic technique is used in the shallow buried section of the opening under the condition of 8 degree of fortification intensity. The single-layer reinforcement seismic technique is used in the transition section of the orifice, and the double-layer reinforcement anti-seismic technique is used in the shallow buried section and the transition section of the tunnel under the fortification intensity of 9 degrees. The research results are of great significance to the development of seismic technology in the tunnel dynamic opening section.
【作者单位】：北方工业大学建筑工程学院;西南交通大学土木工程学院;四川省交通厅公路规划勘察设计研究院;
【基金】：国家自然科学基金(51408008) 西部交通建设科技项目(200831800026);西部交通建设科技项目(200831800098) 中央高校基本科研业务费专项资金资助(SWJTU10XS05)
【分类号】：U452.28

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