铁路膨胀岩隧道支护结构稳定性与注浆范围分析

发布时间：2018-07-05 07:51

本文选题：膨胀岩 + 铁路隧道　；参考：《铁道标准设计》2017年10期

【摘要】：为分析膨胀岩对隧道工程造成的影响程度,综合分析膨胀岩的细观膨胀机理和宏观膨胀特性,确定膨胀发生的主客观因素,通过对膨胀岩试验结果的归纳,提出一种膨胀岩综合分级标准。针对膨胀岩的胀缩性质,推导湿度应力场和温度应力场的理论关系,以玉蒙铁路秀山隧道为工程背景,利用ANSYS软件分析不同膨胀级别、膨胀范围下膨胀力对支护结构的影响程度。结果表明,在弱膨胀工况下最大注浆加固范围为2m,中等膨胀工况下最大加固范围为6m,强膨胀工况下原断面不再适用。膨胀级别越高,支护结构变形越大,隧道拱顶位移随着膨胀力的释放由下沉逐步变为上升,仰拱产生底鼓,边墙收敛表现为在一定的加固范围下随膨胀系数增加而增加,在中、强膨胀级别下随着加固范围的增加表现为前期变形很快,而后期变小的现象,支护结构有被压扁的趋势。
[Abstract]:In order to analyze the influence degree of expansive rock on tunnel engineering, the macroscopic expansion mechanism and macroscopic expansion characteristics of expansive rock are analyzed synthetically, and the subjective and objective factors of swelling are determined, and the results of swelling rock test are summarized. A comprehensive classification standard for expansive rock is proposed. In view of the dilatancy and shrinkage properties of expansive rock, the theoretical relationship between humidity stress field and temperature stress field is deduced. Taking Xiushan tunnel of Yu-Meng railway as the engineering background, the different expansion levels are analyzed by ANSYS software. The degree of influence of expansion force on support structure under expansion range. The results show that the maximum grouting reinforcement range is 2 m under weak expansion condition and 6 m under medium expansion condition, and the original section is no longer applicable under strong expansion condition. The higher the expansion level, the greater the deformation of supporting structure, the displacement of tunnel arch is gradually changed from subsidence to rise with the release of expansion force, the bottom drum is produced in inverted arch, and the side wall converges to increase with the increase of expansion coefficient in a certain reinforcement range. With the increase of reinforcement range, the early deformation is very fast, but the latter is smaller, the support structure has the tendency to be flattened.
【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;
【基金】：国家科技支撑计划重点课题(2012BAG05B01) 江苏建筑职业技术学院科研项目(JYA14-19,ES2015-3)
【分类号】：U455.7

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