基于修正Mohr-Coulomb准则的半无限空间浅埋隧道弹塑性解  

Elasto-plastic solution of shallow tunnel in semi-infinite space based on the modified Mohr-Coulomb failure criterion

作　　者：李小丰 LI Xiaofeng(The 5th Company of the China Railway 18th Bureau Group Co.,Ltd,Tianjin 300451,China)

机构地区：[1]中铁十八局集团第五工程有限公司,天津300451

出　　处：《铁道科学与工程学报》2020年第6期1491-1500,共10页Journal of Railway Science and Engineering

基　　金：国家科技重大专项资助项目(2017YFB1201200)。

摘　　要：假设圆形隧道在均质,连续和各向同性的半无限空间中开挖,静止土压力系数K0等于1,提出一种基于双极坐标系的隧道围岩的弹塑性解。采用修正的摩尔-库伦破坏准则用于表征岩体强度。通过扩展Massinas和Sakellariou的解,完善塑性解,并提供计算临界内压力和塑性区的方法。结合玉磨铁路实际工程案例,通过比较计算结果,验证新方法的优点。This paper proposed a new elasto-plastic solution of the tunnel surrounding rock based on bipolar coordinate system.It was assumed that the circular tunnel is excavated in a homogeneous,continuous and isotropic semi-infinite space,and that the coefficient of earth pressure at rest K0 is equal to 1.The modified Mohr-Coulomb failure criterion was used to characterize the rock mass strength.The proposed approach extended the solution by Massinas and Sakelellaou to improve the plastic solution and develop a method for calculating the critical internal pressure and the plastic region.In combination with the engineering practice of the Yumo railway construction project,the advantage of this new approach was verified by comparing the calculation results.

关 键 词：半无限空间 浅埋隧道 非线性 弹塑解 双极坐标 

分 类 号：U45[建筑科学—桥梁与隧道工程]