隧洞稳定性影响因素的敏感性分析  

Sensitivity Analysis on Influencing Factors of Tunnel Stability

作　　者：李炎延 郑颖人[1,3] 康楠[1,2] 

机构地区：[1]后勤工程学院军事土木工程系,重庆401311 [2]岩土力学与地质环境保护重庆市重点实验室,重庆401311 [3]重庆市地质灾害防治工程技术研究中心,重庆400041

出　　处：《地下空间与工程学报》2015年第2期491-498,共8页Chinese Journal of Underground Space and Engineering

基　　金：国家重点基础研究发展计划(973计划)项目(2011CB013600)

摘　　要：本文采用与常见地铁车站尺寸相仿的隧洞作为算例,通过有限元强度折减法计算隧洞的稳定安全系数,按照定量分析数据,采用灰关联分析方法进行了隧洞稳定性影响因素的敏感性分析,综合分析了六种因素对隧洞稳定影响的敏感性,按大小依次为:黏聚力、内摩擦角、高跨比、重度、埋深和固定高跨比时的跨度。研究表明:在隧洞围岩稳定性分级时,除了考虑地质因素以外,还应对隧洞尺寸,如高跨比与跨度等进行考查。此外,还研究了仰拱深度对隧洞二衬结构稳定性的影响,当围岩稳定性等级较高时无需仰拱,而等级很低时要求仰拱有一定深度才能保证结构安全。上述研究为围岩稳定性分级和隧洞优化设计提供了良好的基础。In this paper, with a tunnel of a size similar to that of a common metro station as an example, the stability safety coefficient of a tunnel is calculated by the method of finite element strength subtraction, by analyzing data quantitatively, the grey relational analysis method is used for sensitivity analysis of the influence factors of tunnel stability, the sensitivity of six factors which influence tunnel stability is analyzed comprehensively, the factor by influence degree is in following order： cohesion, internal friction angle, depth-span ratio, density, buried depth and span of fixed depth-span ratio. Research shows that besides the geological factors, the size of a tunnel such as the depthspan ratio and span should also be considered on the classification of stability of tunnel surrounding rock. In addition, the effect of the depth of inverted arch on the stability of tunnel lining structure is also studied, when the stability classification of surrounding rock is high enough, the inverted arch is not necessary; while certain depth of inverted arch is required to ensure the safety for the structure on lower levels. The research provides a good foundation for the stability classification of surrounding rock and tunnel optimization design.

关 键 词：隧洞稳定性 敏感性 灰关联分析方法 影响因素 

分 类 号：TU457[建筑科学—岩土工程]