【作者】 马士伟；

【导师】 梅志荣；

【作者基本信息】 铁道部科学研究院 ， 桥梁与隧道工程， 2003， 硕士

【摘要】 现场调查表明，铁路运营隧道病害严重，有的危及行车安全，其健康状况不容乐观。究其原因，仅就现行铁路隧道结构形式来说(尚未考虑到施工质量、运营环境的变化、水文地质条件劣化等因素)，隧道病害有两方面值得引起人们的关注。一方面，采用现行隧道标准图施工的隧道结构形式存在着不合理性和低适应性，特别是其下部存在弊端；另一方面，采用现行广为使用的普通台车衬砌质量难以保证。本文针对单线电化铁路隧道复合式衬砌标准图存在的问题进行了结构优化设计研究，提出了全环整体模筑衬砌的概念和若干种方案，并对其进行围岩稳定性分析、技术经济比较和综合受力分析，在此基础上提出了建议采用的设计方案。最后对相配套的施工设备--单线铁路隧道全环整体模筑衬砌台车和施工工艺进行了研究，并提出建议。 本文在以下几个方面进行了重点研究，并有一定的理论创新和技术突破： 1．通过调研国内外隧道设计现状发现，我国隧道设计中采用的标准图与国外相比存在差距。具体表现在：国外隧道重视底部结构，并在一定条件下(如高速)增加基底回填的弹性。我国铁路隧道设计中普遍存在“重拱轻底”的思想，由于基底结构薄弱而引起的隧道病害问题严重。因此，对标准图进行结构优化设计势在必行。 2．在满足优化设计原则的条件下进行了单线铁路隧道断面形式结构优化设计，提出了7种备选方案。并对7种方案和标准图方案进行了隧道全断面开挖后围岩稳定性比较，从中找出隧道开挖后对围岩稳定最有利的断面形式。 3．采用目前铁路隧道设计中常用的“荷载—结构”模式，以Ⅴ级围岩条件为例，对各种方案进行了衬砌结构受力安全度比较。计算结果表明，标准图方案在隧道底部水沟附近结构安全系数偏小，是隧道病害的多发部位，这与实际的观测结果也比较符合。建议采用的优化方案在隧道底部结构安全度满足要求，并且综合力学性能也强于标准图方案。 4．对单线铁路隧道全环整体模筑衬砌台车和施工工艺进行了研究。该台车不仅能消除目前铁路隧道施工中存在的施工纵缝，特别是能减少衬砌施工对装碴运输的影响，从而提高施工速度，保证隧道衬砌质量。 本文最后就主要结论、存在的问题、以及技术展望进行了论述，提出了自己的观铁道科学研究院硕十学位论文点和见解。更多还原

【Abstract】 The site investigation has shown that operating tunnel disease is serious, even dangerous to operation. Without considering the quality of construction, the changes of operating conditions and geological condition, the reason for this is the abuse of the structure and the lining quality by the common lining platform if we consider it only on railway tunnel structure. The standard drawing of composite tunnel lining for single-track railway tunnel is improved, and the concept of full-circular monolithic lining and some kinds of primary scheme have been given. The design schemes are proposed after studying the stability of surrounding rock, comparing technique economy and analyzing all kinds of primary schemes. Finally, construction technology and the mechanical equipment matching, such as formwork of full-circular monolithic lining for single-line railway tunnel, are studied and some suggestions are given.The followings have been paid more attention and some technical innovations have been introduced in the paper.1. There are disparities between the standard drawing used in home and abroad after surveying and studying the actuality of the tunnel design. For example, the base structure of tunnel has been regarded and the resilience of the base is improved for satisfying some particular conditions (such as high velocity) abroad. But the base of tunnel is not regarded in tunnel design, which cause tunnel disease. Hence, the optimized design for the standard drawing must be carried on.2. According to the rule of optimized design, structure shape of single-track railway tunnel is designed, then 7 kinds of schemes are brought forward. By comparing the stability characters of rock after excavated, the best stable section shape is found.3. The security of lining is compared by load-structure model which is used in tunnel design. It shows that the K near the channel of tunnel’s base is lower, and most tunnel diseases arise here, which is in agreement with the survey result. The proposed optimized scheme can meet the requirement of safety degree. Moreover, the synthetically mechanicsperformance is also better than that of standard one.4. The platform and the construction technology for full-circular monolithic lining are studied. The platform can not only get rid of vertical joints lying in construction of railway tunnel, but also decrease the effects of lining construction on mucking and transportation. Thereby it can advance construction velocity and guarantee the quality of lining.Finally, the main conclusions, the problems, the technical innovation have been introduced and some opinion has been proposed in the paper.更多还原