隧道穿越断层破碎带震害机理研究

发布时间：2018-06-04 22:27

本文选题：隧道工程 + 震害机理　；参考：《岩土工程学报》2014年03期

【摘要】：首先对汶川"5.12"等各次大地震中跨越断层破碎带隧道震害进行了资料调研,然后通过振动台模型试验及数值计算对跨断层破碎带隧道的动力响应进行了研究,研究内容主要包括围岩与隧道结构的加速度响应特性、地层变形及衬砌结构内力分布规律等。分析结果表明:震害调研结果、振动台模型试验和数值模拟结果有较好的吻合性,穿越断层破碎带隧道在地震中易于产生破坏;隧道断层带段围岩有较大的加速度响应特性,加速度响应在断层接触段不连续;地震过程中断层带段隧道结构对地层具有明显的追随性和依赖性;断层带隧道错动破坏主要由断层带隧道围岩与较好段围岩位移不同步性而造成的位移差值引起,且位移差值与断层带和隧道较好围岩类型有关;隧道断层破碎带段与较好围岩段衬砌结构横断面具有基本相同的内力分布规律,衬砌内力在共轭45°方向最大,但断层破碎带段衬砌具有最大的内力峰值,更易于在地震过程中产生破坏等。以上成果对于合理认识跨越断层破碎带隧道的地震响应特征具有重要意义,可为隧道实际工程设计和施工的抗震设防提供宝贵的基础资料。
[Abstract]:First of all, the seismic damage of tunnel across fault fracture zone in Wenchuan "5.12" earthquake is investigated, and then the dynamic response of tunnel across fault broken zone is studied by shaking table model test and numerical calculation. The research mainly includes the acceleration response characteristics of surrounding rock and tunnel structure, the distribution law of stratum deformation and internal force of lining structure and so on. The results show that the results of seismic damage investigation, shaking table model test and numerical simulation are in good agreement with each other, and the tunnel passing through fault fracture zone is prone to damage in earthquake, and the surrounding rock of fault zone of tunnel has the characteristic of acceleration response. The acceleration response is discontinuous in the contact section of the fault and the tunnel structure in the fault zone is obviously following and dependent on the formation during the earthquake. The dislocation failure of tunnel in fault zone is mainly caused by the difference of displacement between the surrounding rock of fault zone and the better part of the tunnel, and the difference of displacement is related to the type of the fault zone and the better surrounding rock of the tunnel. The cross section of tunnel fault fracture zone has the same internal force distribution law as that of better surrounding rock segment. The lining internal force is the largest in conjugate 45 掳direction, but the maximum internal force peak value is found in fault broken zone lining. It is easier to cause damage in the course of earthquake. The above results are of great significance to the rational understanding of the seismic response characteristics of tunnels across fault fracture zones, and can provide valuable basic data for the seismic fortification of tunnels in actual engineering design and construction.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;西南交通大学土木工程学院;
【基金】：国家重点基础研究发展计划(973)项目(2010CB732105) 国家科技支撑计划课题(2012BAG05B03,2013BAB10B04) 国家自然科学基金高铁联合基金项目(U1134208) 国家杰出青年科学基金项目(50925830)
【分类号】：U452.11;U452.28

【参考文献】