大断面软岩隧道变形控制技术研究

发布时间：2018-03-14 11:43

本文选题：隧道(洞)　切入点：软弱围岩　出处：《隧道建设》2015年04期 　论文类型：期刊论文

【摘要】：隧道开挖后受地应力影响极易发生变形,严重的将导致坍方等安全事故,若侵入结构还需要二次扩挖处理。为保障软弱围岩隧道的施工安全,避免二次扩挖,结合国内外隧道的典型案例和经验,从分析围岩的强度应力比出发,针对不同的软岩类型,对预留变形量、预加固措施、弱爆破的基本原则,综合信息方法、支护措施、施工要点等内容进行归纳研究。研究表明:1)预留变形量选择要充分考虑隧道的最大地应力和不同软岩物理特性的影响;2)上台阶采取有效预加固措施后,可以实施大断面开挖;3)不同地应力环境,必须根据信息成果,针对变形特征优化设计支护参数后,变形完全能够有效控制。
[Abstract]:It is easy to deform after the tunnel is excavated by the ground stress, which will lead to the safety accident such as slump and so on. If the intrusive structure is invaded, it still needs to be treated by secondary excavation. In order to ensure the construction safety of the tunnel with weak surrounding rock and avoid the secondary expansion excavation, Combined with typical cases and experiences of tunnels at home and abroad, based on the analysis of the ratio of strength and stress of surrounding rock, aiming at different types of soft rock, the basic principles of reserved deformation, pre-reinforcement measures, weak blasting, comprehensive information methods and supporting measures are discussed. The main points of construction are summarized and studied. The study shows that the selection of reserved deformation should take full account of the influence of maximum ground stress of tunnel and physical characteristics of different soft rock on the selection of deformation. (2) after effective pre-reinforcement measures are taken up the steps, Large section excavation can be carried out in different geostress environment. According to the results of information, the deformation can be controlled effectively after the supporting parameters are optimized according to the deformation characteristics.
【作者单位】：中铁二局第二工程有限公司;
【分类号】：U455.4

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