强震作用下大断面海底盾构隧道管片环缝防水性能

发布时间：2018-07-08 12:10

本文选题：盾构隧道 + 环缝防水性能　；参考：《中国公路学报》2017年08期

【摘要】：为探明强震作用下导致的盾构隧道管片接缝大张开情况下的防水性能,以在高烈度区修建的大断面海底盾构隧道——苏埃通道工程为依托,通过有限元数值分析建立纵向等效刚度模型及隧道全长震动分析模型,确定了高烈度区强震作用下管片环缝的震动张开量,并根据张开量的大小类比既有大断面盾构隧道防水标准,建立了高烈度区强震作用下大断面盾构隧道环缝防水指标;通过接缝防水试验,优化了密封垫及沟槽截面尺寸,并据此提出了强震作用下的大断面海底盾构隧道管片环缝防水的合理形式。结果表明:强震作用时三段硬岩凸起处、接收井处及多地层交互处环间接缝张开量显著大于其他区段,其环间张开最大值远大于既有大断面盾构隧道的张开量,应对此类区段采取特殊的抗震措施,降低环缝张开量;仅增加密封垫的厚度达不到强震条件下的防水要求,并且密封垫的压缩应力会急剧提高,于管片拼装不利,同时提高密封垫截面并加深密封垫沟槽可提高抗水压能力,且密封垫的压缩应力能达到一个合理值,不影响管片的拼装效率。研究结果可为苏埃通道工程及类似工程的管片接缝防水设计提供参考。
[Abstract]:In order to find out the waterproofing performance of shield tunnel segment joints under the action of strong earthquake, the large section shield tunnel-Sueh tunnel project built in high intensity area is used as the basis. The longitudinal equivalent stiffness model and the full-length vibration analysis model of the tunnel are established by the finite element numerical analysis, and the vibration opening amount of the annular joint of the tube is determined under the action of strong earthquake in the high intensity region. According to the comparison of the opening size of the existing large section shield tunnel waterproofing standard, the waterproof index of the large section shield tunnel circumferential joint under the action of strong earthquake in the high intensity area is established, and the sealing gasket and groove section size are optimized through the joint waterproofing test. Based on this, a reasonable form of waterproofing around segment of large section shield tunnel under strong earthquake is put forward. The results show that the opening volume of the interring joint between the receiving wells and the interstratigraphic intersections is significantly larger than that of the other sections, and the maximum opening between the rings is much larger than the opening of the existing large-section shield tunnel during strong earthquake. Special anti-seismic measures should be taken for such sections to reduce the opening of annular joints; only increasing the thickness of the gasket is not up to the waterproof requirements under strong earthquake conditions, and the compression stress of the gasket will increase sharply, which will be disadvantageous to the assembly of segments. At the same time, increasing the section of the gasket and deepening the grooves of the gasket can improve the water pressure resistance, and the compression stress of the gasket can reach a reasonable value without affecting the assembly efficiency of the segment. The results can be used as a reference for the waterproofing design of segment joints in Suai tunnel engineering and similar projects.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;石家庄铁道大学河北省大型结构健康诊断与控制重点实验室;
【基金】：国家重点研发计划项目(2016YFC0802202) 国家自然科学基金-煤炭联合基金重点项目(U1361210);国家自然科学基金项目(51578462) 厦门市科技计划重大项目(3502Z20151006,2016Z036)
【分类号】：U455.43;U459.5

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