摘要
近水平软弱岩层具有抗压强度低、节理裂隙发育、物理各向异性明显等特点,一直是隧道工程研究领域的一个热点问题,本文以广南高速公路栾家岩隧道为例,采用正交各向异性有限元模型对隧道Ⅴ级围岩条件下台阶法和CD法两种开挖方法的变形及受力特性做了详细的比较分析,最终得出结论,建议广南高速公路栾家岩隧道Ⅴ级围岩条件下,施工时采用CD法开挖对于施工过程中围岩及衬砌结构受力较台阶法更为有利。研究也可为近水平软弱岩层条件下的其它类似隧道工程提供参考。
The approximate horizontal weak rock has low compressive strength,developed joint and fracture,obvious physical anisotropy etc and is always a hot issue in tunnel engineering.In this paper,the Luanjiayan expressway tunnel is taken as the example.The deformation and stress characteristics of Ⅴ grade rock under different construction schemes,namely the step-method and the CD-method,are analyzed in detail using the orthotropic FEM model.Through the comparison of the deformation and stress under two construction schemes,the CD-method is more favorable to the surrounding rock and tunnel lining structure of Luanjiayan expressway tunnel.This work can offer reference for other tunnel engineering in approximate horizontal weak rock.
出处
《地下空间与工程学报》
CSCD
北大核心
2012年第2期358-362,共5页
Chinese Journal of Underground Space and Engineering