【作者】 肖锡庄；

【导师】 曾德荣；

【作者基本信息】 重庆交通大学 ， 建筑与土木工程， 2011， 硕士

【摘要】 为适应日益增长的经济和交通发展要求,同时为解决特殊地质地形条件下公路线桥隧衔接、总体线型规划和优化等问题,在坚持可持续发展、切实保护生态环境和有限的土地资源的战略指导下,半明半暗结构形式的隧道逐渐显现其重要性。由于这类隧道结构型式的特殊性和新颖性,其双洞施工相互影响大,在设计和施工过程中均存在许多关键问题需要解决,有必要进行系统深入的分析和探讨。本文以蕉坞隧道为依托工程,采用有限元软件进行有限元模拟,以钝化、激活单元法模拟隧道连续施工过程,对半明半暗隧道施工力学情况进行了研究,对围岩和支护体系的变形和受力情况进行了分析,得到了半明半暗隧道施工时围岩和支护体系随施工过程变化的情况,同时对监测数据进行数据处理、分析并总结规律,将数值模拟的结果与实测数据的分析结果进行了对比研究。研究结论对半明半暗隧道的设计、施工具有现实意义,可以指导设计并优化施工,为今后类似工程的设计、施工提供参考。更多还原

【Abstract】 Following the strategic direction of insisting sustainable development and protecting ecological environment and limited land resources, and to satisfy the rapid development of economy and transportation, small spacing highway tunnel with the half-open and half-hidden structure seems be of great demand. This type tunnel has the advantage of optimizing the whole road allocation plan under special geologic and topographic conditions; however, owning to its particularity, and infrequence, the interaction between two tunnels is fairly serious. Thus, there are still several key problems needed to be solved during the design and construction procedure, and it’s necessary to make a systematic and considerate analysis on it.In this paper, Basing on the tunnel of Jiaowu tunnel, combining with MIDAS/GTS program, the continuous excavation by load steps is simulated through the“activation and passivation”method. The mechanics behavior of the half-open and half-hidden structure tunnel and the characteristic of stress and deformation of surrounding rock supporting system are studied, and then the regularity of these is gained. By comparing the analysis results with in-situ testing data, some useful regularities are also gained. The research is of great practical significance for the plan and design upon the construction of the highway. Moreover, since guiding the project and optimizing the construction, this essay sheds light on the further similar work.更多还原