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本文讨论了各种圆形有压隧洞围岩抗力系数计算公式;着重研究了岩石扩容特性及地应力场对围岩抗力特性的影响。重新建立了圆形有压隧洞在地应力场中的力学模型。据此建立无限大岩体承受地应力和均匀内压的圆形隧洞弹塑性分析的微分方程式;运用岩石力学中广泛使用的莫尔——库仑屈服准则,推求出有裂缝区,塑性区及弹性区共同影响的计算岩石抗力系数“K”的新公式。
This paper discusses the calculation formulas for the resistance coefficients of surrounding rocks of circular tunnels with various pressures, and focuses on the study of the characteristics of rock expansion and the influence of ground stress field on the resistance characteristics of surrounding rocks. The mechanical model of the circular pressure tunnel in the ground stress field was re-established. Based on this, the differential equations for the elasto-plastic analysis of circular tunnels subjected to in-situ stress and uniform internal pressure in infinite rock masses are established; the Mohr-Coulomb yield criterion widely used in rock mechanics is used to derive fractured zones, plastic zones, and The new formula for the calculation of the rock resistance coefficient “K” is jointly influenced by the elastic zones.