【摘要】 利用岩石破裂过程分析软件RFPA2D,对岩体中的圆孔周边的变形及非线性渐进破坏特征、巷道周边关键部位的应力变化进行了分析,研究了应力场中侧压力系数对围岩应力场分布的影响。研究指出,侧压系数λ对应力场分布及圆孔周边松动区的破坏特征起决定作用。当λ≤1时,顶板的塑性区和卸压范围较大,但顶板挠度却较小;当λ>1时,顶板的塑性区和卸压范围较小,但顶板挠度却较大。对于进一步深入理解深部岩体中巷道破坏失稳机制并采取有效的加固措施等具有重要的理论和实践意义。更多还原

【Abstract】 In light of the heterogeneity of rock,by introducing the constitutive model based on damage mechanics and statistical theory and using the RFPA2D,the influene of the horizontal in-situ stresses on the distributions of plastic zones is discussed.The deformation and nonlinear gradual failure characteristics of circular roadway in deep rock mass as well as the displacement and the stress variation of the key positions in the periphery of the roadway are analyzed,Whenλ ≤1,the plastic area is large-scale,but deflection more little;whenλ > 1,the plastic area is little-scale,but deflection more big.The study indicates that the stress concentration occurs in the periphery of the roadway after evacuation and plastic deformation zone engenders under the persisting stress of the surrounding rock;then the cracks appear and expand continuously;the broken rock zone appears at last and the intensity of the stress concentration decreases as well as the stress field shifts beyond.This study is very useful and significant both on the theoretical and practical aspects.更多还原