节理倾角对公路隧道围岩塌落拱影响分析

发布时间：2018-01-05 20:33

本文关键词：节理倾角对公路隧道围岩塌落拱影响分析　出处：《现代隧道技术》2014年06期 　论文类型：期刊论文

【摘要】：文章主要通过室内石膏块模型试验对节理间距为0.5 m的隧道围岩在节理倾角分别为0°,30°,45°,60°和90°时无支护开挖情况下围岩的塌落拱跨度、高度和塌落面积的探讨,得出了在不同节理倾角下得到的结果 ,并与普氏理论值进行了对比分析,发现塌落高度、塌落宽度以及塌落面积均与节理倾角呈非线性变化关系,其极小值介于45°~60°之间;同时利用离散元软件UEDC对上述工况进行二维数值分析,室内试验结果与数值分析结果一致;依据数值计算和室内试验综合分析,得到了在不同节理倾角下塌落拱高度的计算方法。
[Abstract]:In this paper, through the model test of gypsum block in room, the joint inclination angle of the tunnel surrounding rock with a joint spacing of 0.5 m is 0 掳~ 30 掳~ 45 掳respectively. In the case of 60 掳and 90 掳unsupported excavation, the span, height and collapse area of surrounding rock collapse arch are discussed, and the results under different joint inclination angles are obtained, and the results are compared with those of Pratt's theory. It is found that the height, width and area of collapse show a nonlinear relationship with the dip angle of the joint, and the minimum value is between 45 掳and 60 掳. At the same time, using discrete element software UEDC to carry on the two-dimensional numerical analysis to the above working condition, the indoor test result is consistent with the numerical analysis result; On the basis of numerical calculation and comprehensive analysis of laboratory tests, a method for calculating the height of collapsing arch under different dip angles of joints is obtained.
【作者单位】：同济大学测绘与地理信息学院;上海同岩土木工程科技有限公司;同济大学地下建筑与工程系;
【分类号】：U451.2
【正文快照】： 刘学增1刘文艺2,3索超峰3(1同济大学测绘与地理信息学院,上海200092;2上海同岩土木工程科技有限公司,上海200092;3同济大学地下建筑与工程系,上海200092)修改稿返回日期:2013-08-011前言节理是很常见的一种构造地质现象,其实是岩石受力而出现的裂隙,但裂开面的两侧没有发生明

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