| 深埋隧道围岩滑移面验证及稳定性分析 |
| |
| 引用本文： | 郭子红,刘新荣,舒志乐.深埋隧道围岩滑移面验证及稳定性分析[J].中南大学学报(自然科学版),2012,43(1):315-321. |
| |
| 作者姓名： | 郭子红 刘新荣 舒志乐 |
| |
| 作者单位： | 1. 重庆大学土木工程学院,重庆,400045;四川农业大学城乡建设学院,四川都江堰,611830
2. 重庆大学土木工程学院,重庆,400045 |
| |
| 基金项目： | 国家高技术研究发展计划(“863”计划)项目(2007AA11Z110);国家自然科学基金创新群体基金资助项目(50621403);四川省教育厅科研项目(11ZB055) |
| |
| 摘 要： | 为了采用安全系数分析深埋圆形盾构隧道稳定性,以隧道围岩弹塑性区域的应力分布为基础,采用变分方法验证围岩滑移面的分布形态.将围岩简化为理想弹塑性材料,结合弹塑性区域应变分布获得围岩极限塑性半径.基于Mohr-Coulomb准则,选取隧道安全系数为极限塑性半径内沿隧道滑移面围岩的抗剪强度与剪切力之比,获得以安全系数为隧道稳定性指标的分析方法.通过算例分析得出极限应变与屈服应变比值、围岩力学参数和支护参数与隧道相对塑性半径和安全系数的关系.研究结果表明:增加围岩内聚力、内摩擦角及支护压力能有效抑制隧道塑性区半径发展与提高隧道安全系数；围岩变形协调能力越好,整体越稳定.
|
| 关 键 词： | 深埋隧道 隧道滑移面 极限塑性半径 变分方法 安全系数 |
Verification of deep tunnel rock mass sliding surface and stability analysis |
| |
| GUO Zi-hong
,
LIU Xin-rong
,
SHU Zhi-le.Verification of deep tunnel rock mass sliding surface and stability analysis[J].Journal of Central South University:Science and Technology,2012,43(1):315-321. |
| |
| Authors: | GUO Zi-hong LIU Xin-rong SHU Zhi-le |
| |
| Institution: | 1 (1.College of Civil Engineering,Chongqing University,Chongqing,400045,China; 2.College of Urban and Rural Construction,Sichuan Agricultural University,Dujiangyan 611830,China) |
| |
| Abstract: | In order to analyze deep circular shield tunnel’s stability with safety factor,on the basis of stress distribution in the rock mass,rock mass sliding surface was verified with the variational method.On the assumption that rock mass was elastic-perfectly plastic material,rock mass critical radius came out in plastic zone.With Mohr-Coulomb criterion,tunnel safety factor was defined as equalling the ratio of shear resistance to shear force on the rock mass sliding surface in the critical plastic zone.Safety factor serves as stability index and tunnel stability quantificational analysis was realized.The influences of the ratio of critical strain to yield strain,rock mass mechanics parameter and support parameter on the tunnel plastic radius and safety factor were analyzed.The results show that enhancing rock mass cohesion,friction angel and support are able to restrain the development of tunnel plastic zone,can enhance tunnel safety factor,rock mass’ deformation compatibility is better,and tunnel is more stable. |
| |
| Keywords: | deep tunnel tunnel sliding surface critical radius of plastic range variational method safety factor |
| 本文献已被 CNKI 万方数据 等数据库收录！ |
|
