深埋特长软岩隧道二次衬砌支护时机研究

发布时间：2018-03-03 06:00

本文选题：软岩　切入点：深埋特长隧道　出处：《铁道建筑》2014年09期 　论文类型：期刊论文

【摘要】：软岩强度低,易风化破碎,易产生流变,其变形具有比较明显的时空效应,因此二衬最佳支护时间的确定成为软岩隧道施工中的难点。本文以十房高速公路通省隧道为工程背景,对3种不同的支护形式Z5,Z5b,Z5c进行数值模拟分析,得出Z5,Z5b,Z5c 3种支护形式下二次衬砌的最佳施作时间分别在16,12和15 d。同时结合对现场监测数据的拟合回归分析结果,借鉴相关规范,对规范中二衬支护时机的相关指标进行修正,得出各支护形式下二衬支护时机的变形速率:Z5,Z5b,Z5c 3种支护条件下周边收敛变形速率分别为0.66,1.10,0.88 mm/d,其拱顶下沉变形速率分别为0.54,0.91,0.85 mm/d。该方法有效地指导了隧道的施工,可为类似工程提供参考。
[Abstract]:Soft rock has low strength, easy to be weathered and broken, easy to produce rheology, and its deformation has obvious space-time effect. Therefore, the determination of the best supporting time of the second lining has become a difficult point in the construction of soft rock tunnel. In this paper, taking the tunnel of Shifang Expressway as the engineering background, the numerical simulation analysis of three different kinds of support forms, Z5Z5bNZ5c, is carried out. It is concluded that the optimum application time of secondary lining is 16 ~ 12 days and 15 days respectively under three kinds of supporting forms. At the same time, combining with the result of regression analysis of field monitoring data and referring to relevant codes, the relevant indexes of the timing of secondary lining support in the code are revised. It is obtained that the deformation rate of the second lining supporting opportunity under three kinds of support conditions: Z _ Z _ 5, Z _ 5b, Z _ 5c, respectively, the convergent deformation rate of the circumference is 0.66U _ 1.10 ~ 0.88 mm / d, and the deformation rate of the dome sinking is 0.54 ~ 0.91 ~ 0.85 mm / d, respectively. This method has effectively guided the tunnel construction. It can provide reference for similar projects.
【作者单位】：中国地质大学(武汉)工程学院;
【基金】：国家自然科学基金资助项目(41202201)
【分类号】：U455.4

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