节理倾角对公路隧道围岩塌落拱影响分析  

Effects of the Joint Dip Angle on the Collapsed Arch of Surrounding Rock Around a Highway Tunnel

作　　者：刘学增[1] 刘文艺[2,3] 索超峰[3] 

机构地区：[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

出　　处：《现代隧道技术》2014年第6期73-77,共5页Modern Tunnelling Technology

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。Based on an indoor gypsum model test, this paper discusses the span and height, as well as the area of collapsed arches of surrounding rock with joint spacings of 0.5 m; dip angles of 0° , 30° , 45° , 60° , 90°; and without support. Compared with the values of the Platts theory, there is a nonlinear relationship between the joint dip angle and the collapse height, width, and area, with the minimum values occurring with angles of 45°~60° . The test results are consistent with the calculated ones according to a 2D numerical analysis of the above conditions with UEDC software. Based on a comprehensive analysis of numerical calculations and indoor test results, a calculation method for collapsed arch heights under different joint dip angles is obtained.

关 键 词：隧道围岩 节理倾角 塌落拱 折减系数 UDEC软件 

分 类 号：U451.2[建筑科学—桥梁与隧道工程]