CRD四步法和六步法开挖超浅埋隧道的结构内力分析  

Comparative Analysis on Internal Force for Excavating Super Shallow Tunnel by CRD Four Steps Method and Six Steps Method

作　　者：张定邦[1] 周斌[1] 

机构地区：[1]黄石理工学院土木建筑工程学院,湖北黄石435003

出　　处：《黄石理工学院学报》2011年第5期34-37,共4页Journal of Huangshi Institute of Technology

基　　金：黄石理工学院博士基金项目(项目编号:10yjz02R)

摘　　要：针对某城市超浅埋地铁隧道采用CRD四步法和六步法穿越黏土层的适应性,运用摩尔-库仑准则和ANSYS软件进行弹塑性数值计算,分析采用四步法和六步法2种工法时的轴力、弯矩分布情况,并将计算结果进行对比分析。结果表明,采用CRD四步法时产生的轴力及弯矩较六步法大,且在隧道外侧轮廓线附近发展较为明显。为有效控制开挖超浅埋隧道产生的结构内力,保证结构稳定性,建议在实际施工过程中采用六步开挖法。On the adaptability of CRD four steps method and six steps method for excavating super shallow tunnel, elastic -plastic simulation had been executed by ANSYS and Mohrcoulomb criterion. The development and distribution of axial force and moment of two kinds of methods had been compared. Analysis indicated that the axial force and moment of CRD four steps method were larger than those of six steps method. It was comparatively obvious that the axial force and moment developed near the lateral contour of tunnel by both two methods. The CRD six steps method was better than four steps method for excavating super shallow tunnel and should be adopted in actual construction process.

关 键 词：超浅埋隧道 轴力和弯矩 隧道开挖 CRD法 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]