活动断裂区隧道动力响应研究

发布时间：2018-06-15 07:51

本文选题：活动断层 + 隧道　；参考：《石家庄铁道大学》2015年硕士论文

【摘要】：随着我国基础建设的发展,一些公路、铁路隧道及地下铁道工程都遇到穿越地震活动断裂带问题。隧道通过地震活动性断裂区,结构需有抗震和承受断层活动位错的能力,应能满足大震不塌、震后可修的安全要求。地震作用下结构与断层围岩的相互作用关系,地震后断层大尺寸位错结构灾变控方法,都给业界提出了新挑战。抗震、减震的问题成为了如今地下工程的新问题。本论文根据乌鲁木齐地铁安全评价报告,采用模型试验和数值分析方法,分析地震活动断层的工程特性,地层与隧道结构动力响应,确定环向减震缝的减震作用及隧道结构环向减震缝参数对衬砌抗震性能的影响规律。通过系统分析,得到了:(1)地震带与活动断层有着成因上的密切联系,活动断层的作用又是产生地震和地震带分布的根本因素。(2)模型试验结果表明,在地震作用下断层破碎带地震位移高于未破碎地层71%,设置减震缝能够使隧道衬砌上的应力大幅度减小,最大拉应力减小幅度为60.9%,最大压应力减小幅度为68.8%。(3)数值模拟结果表明,在地震作用下断层破碎带地震位移高于未破碎地层76%,衬砌上的最大拉应力减小幅度为65.7%,最大剪应力减小幅度为16.8%,但对衬砌的位移和加速度响应影响较小。模型试验与数值计算结果规律一致,数值上有一定差距。
[Abstract]:With the development of infrastructure in China, some highway, railway tunnel and underground railway projects are confronted with the problem of crossing seismically active fault zones. Through the seismically active fault zone, the structure should have the ability to resist earthquake and withstand the dislocation of fault activity, which can meet the safety requirements of earthquake failure and repairable after the earthquake. The interaction between the structure and the surrounding rock of the fault and the catastrophe control method of the large scale dislocation structure of the fault after the earthquake have posed a new challenge to the industry. The problem of earthquake resistance and damping has become a new problem in underground engineering nowadays. Based on the safety evaluation report of Urumqi metro, this paper analyzes the engineering characteristics of seismically active faults and the dynamic response of stratum and tunnel structure by using model test and numerical analysis method. The influence of the parameters of the annular damping joints on the seismic performance of the lining is determined. Through systematic analysis, it is obtained that there is a close relation between the earthquake zone and active fault, and the action of active fault is the basic factor of earthquake and seismic zone distribution. The result of model test shows that, The seismic displacement of fault fracture zone is higher than that of unbroken stratum under earthquake action. The results of numerical simulation show that the stress on tunnel lining is greatly reduced, the maximum tensile stress is reduced by 60.9 and the maximum compressive stress is reduced by 68.8. Under earthquake action, the seismic displacement of fault fracture zone is higher than that of unbroken stratum, the maximum tensile stress on the lining decreases by 65.7and the maximum shear stress decreases by 16.8m, but the influence on the displacement and acceleration response of the lining is small. The results of model test and numerical calculation are consistent, and there is a certain gap in numerical value.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U452.28

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