围岩地质与力学特性.DOC

超大跨度悬索桥隧道锚承载特性的 岩石力学综合研究 邬爱清1，彭元诚2，黄正加1，朱杰兵1 (1. 长江科学院 水利部岩土力学与工程重点实验室，湖北 武汉 430010；2. 中交第二公路勘察设计研究院有限公司，湖北 武汉 430056) 摘要：实桥隧道锚碇的长期安全系数2.6。通过工程实际施工过程中的监测实施，对研究成果和结论的合理性进行验证。研究技术路线及成果可供山区类似桥梁建设借鉴。 关键词：中图分类号： 文献标识码：A 文章编号：ROCK MECHANICS COMPREHENSIVE STUDY OF BEARING CAPACITY CHARACTERISTICS OF TUNNEL ANCHORAGE for super-large span suspension bridge WU Aiqing1，PENG Yuancheng2HUANG Zhengjia1，ZHU Jiebing1(1. Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources，Yangtze River Scientific Research Institute，Wuhan，Hubei 430010，China；2. Second Highway Consultants Co.Ltd.，China Communications Construction Co.，Wuhan，Hubei 430056，China) Abstract：According to bearing capacity problem of a tunnel anchorage at Yichang side for Siduhe super-span suspension bridge， systematically the deformation and failure mechanism，rheological characteristics and overloading capacities of the tunnel anchorage and its surrounding rock mass by a comprehensive rock mechanics research method are proposed. The approach included in the research consists of in-situ geological investigation，rock mechanical tests in laboratory and in the field，the 1∶12 anchorage physical model test with the same rock mass at site of the actual schemed tunnel anchorage，and the numerical simulations related to physical model test and the engineering analysis of bearing capacity evaluations of the actual tunnel anchorage. Several conclusions have been drawn. Firstly，the mechanical properties and the relevant parameters of the surrounding rock mass are obtained comprehensively by rock mechanical tests；and the physical model tests are quite reasonable compared to the actual monitoring results. Secondly，the total deformation of the actual tunnel anchorage is in the grade of mm with the designing load which will be supplied by the suspension bridge. Thirdly，the design requirement for the safety factor of the tunnel anchorage，which is greater than 4.0，is evaluated to be satisfied by the