论文部分内容阅读
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。
According to the idea of load-structure method, it is important to consider reasonably the secondary stress caused by excavation of surrounding rock and lining, which plays an important role in improving the resistance coefficient of surrounding rock. Based on the Squeezable Spatial Mobilized Plane (SMP) yield criterion, the article derives the calculation formula of the surrounding rock resistance coefficient, which can well consider the influence of the intermediate principal stress. By comparing the internal friction angle φ and cohesion c in the physical and mechanical properties of the surrounding rock of the tunnel with the calculated values of the surrounding rock resistance coefficient under the Mohr-coulomb strength criterion, The results show that considering the influence of middle principal stress, the resistance coefficient of surrounding rock of tunnel can be well improved. Therefore, it is of great engineering practical value to calculate the surrounding rock resistance coefficient of lining tunnel based on SMP criterion of viscous material.