【摘要】 按照荷载-结构法思想,合理地考虑围岩与衬砌共同承载由于开挖而引起的二次应力作用,对于提高围岩抗力系数具有重要的作用。文章基于SMP(Spatially Mobilized Plane)屈服准则,推导出围岩抗力系数的计算公式,可以很好地考虑中间主应力的影响。通过改变隧道围岩物理力学性质中的内摩擦角φ和黏聚力c值,与Mohr-coulomb强度准则下的围岩抗力系数计算值进行了对比。研究结果表明,考虑中间主应力的影响可以很好地提高隧道围岩的抗力系数。从而基于黏性材料的SMP准则计算具有衬砌隧道的围岩抗力系数具有较强的工程实用价值。更多还原

【Abstract】 According to the viewpoint of load,it is very important to consider the common bearing and the secondary stress functions caused by excavating for the surrounding rock and lining.Based on the spatially mobilized plane(SMP) failure criterion,the formula for calculating rock resistant coefficient is given.It can be adopted to consider the intermediate principal stress effect.Through changing the internal friction φ and the cohesion c of the physical mechanics nature for the tunnel rock,it is shown that considering the influence of the intermediate principle stress can enhance the rock resistant coefficient of the lining tunnels compared with the rock resistant coefficient by using the Mohr-Coulomb failure criterion.So the rock resistant coefficient of the lining tunnels has certain practical significance based on the SMP failure criterion of the cohesion materials.更多还原