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为评价巷道围岩的安全稳定性和进行支护定量设计,分析非均匀应力场中巷道围岩的塑性区形态。考虑中间主应力、岩石性质和岩体结构特点对岩体变形破坏的影响,应用岩石非线性统一强度准则和弹塑性力学方法,推导出非均匀应力场中的圆形巷道围岩的塑性区边界线方程,研究了侧压系数、Hoek-Brown参数和中间主应力对塑性区形态的影响。结果表明,侧压系数对塑性区分布有很大影响,侧压系数不同,巷道顶底板和两帮的塑性区分布形态不同。岩体质量越好,Hoek-Brown参数越大,塑性区范围越小,反之,塑性区范围越大。考虑中间主应力能够发挥岩体的强度潜能,计算出的塑性区也随之变小。
In order to evaluate the safety and stability of roadway surrounding rock and carry out quantitative design, the plastic zone morphology of surrounding rock in non-uniform stress field is analyzed. Considering the influence of intermediate principal stress, rock properties and rock mass structural features on the deformation and failure of rock masses, the plastic zone boundaries of surrounding rock in circular tunnels in inhomogeneous stress field are deduced by applying the nonlinear uniform strength criterion and elastoplastic method Line equations, the effects of the lateral pressure coefficient, Hoek-Brown parameters and intermediate principal stress on the plastic zone morphology were studied. The results show that the lateral pressure coefficient has a great influence on the plastic zone distribution. The lateral pressure coefficient is different, and the plastic zone distribution patterns of the top and bottom floor and the two sides of the roadway are different. The better the rock quality is, the larger the Hoek-Brown parameter is, the smaller the plastic zone is. On the contrary, the larger the plastic zone is. Taking into account the middle principal stress can exert the strength potential of rock mass, the calculated plastic zone also becomes smaller.