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为了探究原岩应力对塑性区应力的影响,采用SMP(Spatially Mobilized Plane)屈服准则对轴对称的圆形硐室进行理论分析,利用硐室周边和硐室围岩弹塑性交界处的应力边界条件,分别得到了塑性区的应力和硐室的支护力与原岩应力的关系式;研究表明,硐室围岩塑性区的应力和硐室支护力不仅仅与围岩的力学性质有关而且还与原岩应力有关。通过算例分析了原岩应力对塑性区的应力和硐室支护力的影响,分析结果表明:塑性区的应力会随着原岩应力的增大而增大,并且在不同深度处,沿着硐室围岩深部逐渐增大,并且塑性区的应力和支护力均与原岩应力存在明显的线性关系。
In order to investigate the influence of the original rock stress on the plastic zone stress, the axial symmetric circular chamber was analyzed by the SMP (Spatially Mobilized Plane) yield criterion. By using the stress boundary conditions at the elastic-plastic boundary between the perimeter of the chamber and the surrounding rock of the chamber, , The relationship between the stress of plastic zone and the supporting force of rock chamber and the original rock stress are respectively obtained. The research shows that the stress of plastic zone and the supporting force of chamber are not only related to the mechanical properties of surrounding rock but also Also related to the original rock stress. The influence of original rock stress on the stress in plastic zone and the branch supporting force is analyzed by an example. The results show that the stress of plastic zone will increase with the increase of the stress of the original rock, and at different depths, The deep part of the chamber surrounding rock gradually increases, and the stress and support force of the plastic zone both have a clear linear relationship with the original rock stress.