铁路膨胀岩隧道初期支护稳定性分析及设计优化

发布时间：2018-03-26 16:39

本文选题：铁路隧道　切入点：设计优化　出处：《铁道建筑》2017年05期

【摘要】：通过对国内外学者研究成果的归纳总结,结合隧道工程特点,提出一种膨胀岩综合分级标准。以玉(溪)蒙(自)铁路秀山隧道为工程背景,采用ANSYS软件分析中、强膨胀级别下膨胀力对初期支护的影响规律。结果表明:原设计中等膨胀工况膨胀范围为4 m时最小加固范围为6 m,强膨胀工况加固范围太大,常规注浆工艺较难实现;隧道断面优化后中等膨胀工况膨胀范围为4 m时最小加固范围为2 m,强膨胀工况膨胀范围为3 m时最小加固范围为4 m;随膨胀级别升高,初期支护仰拱底鼓和边墙收敛量增加;优化后由于加固范围减小,初期支护变形量增大。
[Abstract]:Through summing up the research results of scholars at home and abroad and combining the characteristics of tunnel engineering, a comprehensive classification standard of expansive rock is put forward. Taking the Xiushan tunnel of Yuxi Mongol (Zaizi) railway as the engineering background, the ANSYS software is used in the analysis. The effect of expansion force on the initial support under the strong expansion level. The results show that the minimum reinforcement range is 6 m when the expansion range of the original design is 4 m, and the strengthening range under the strong expansion condition is too large, so it is difficult to realize the conventional grouting technology. The minimum reinforcement range is 2 m when the expansion range of medium expansion condition is 4 m and 4 m when expansion range of strong expansion condition is 3 m after optimization of tunnel section, and the convergence amount of initial support inverted arch floor and side wall increases with the increase of expansion level. After optimization, the initial support deformation increases due to the decrease of reinforcement range.
【作者单位】：石家庄铁道大学土木工程学院;江苏建筑职业技术学院;西南交通大学土木工程学院;
【基金】：国家科技支撑计划(2012BAG05B01) 江苏建筑职业技术学院科技项目(JYA14-19,JYA315-10)
【分类号】：U455.7

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