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为分析在非均匀应力场下受到扰动的轴对称巷道的稳定性和安全性,基于Drucker-Prager(简称D-P)准则,推导非均匀应力场下巷道塑性区范围解答方程。利用算例,分析侧压系数、原岩应力扰动系数、支护阻力等因素对巷道断面不同位置(由于对称性,只研究轴对称巷道的第1象限部分)塑性区范围的影响,并利用FLAC3D软件模拟不同侧压系数下巷道围岩塑性区的范围。结果表明:在非均匀应力场中,原岩应力扰动系数和侧压系数以及支护力对巷道围岩塑性解的影响很大;适时加大支护反力能有效控制巷道围岩的稳定性。
In order to analyze the stability and safety of axially symmetric roadway disturbed in inhomogeneous stress field, the solution equation of plastic zone in non-uniform stress field is derived based on Drucker-Prager (D-P) criterion. The effect of lateral pressure coefficient, original rock stress disturbance coefficient and supporting resistance on the plastic zone in different positions (due to the symmetry, only the first quadrant part of the axisymmetric roadway) is analyzed and the influence of FLAC3D Software simulates the plastic zone of surrounding rock under different side pressure coefficient. The results show that in the inhomogeneous stress field, the original rock stress disturbance coefficient, the lateral pressure coefficient and the support force have a great influence on the plastic solution of surrounding rock mass. The stability of the surrounding rock in the roadway can be effectively controlled by increasing the supporting force in time .