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巷道的围岩或岩石斜坡的岩体中,任一个岩块小单元,实际上都是处于三向不均应力的作用之下。同时,随着岩体的初应力状态、它所处的空间位置和工程附加予岩体上的载荷的不词,该点(岩块小单元)的三个主应力(σ_1:σ_2:σ_3)的比值也各不相同。在不均匀三向应力系的作用下,岩块的稳定则取决于岩石的三维强度。根据关于“强度极限面”的假设,当三个主应力
Any rock mass in the surrounding rock or rock slope of the roadway is actually under the effect of three-dimensional inhomogeneous stress. At the same time, the three principal stresses (σ_1: σ_2: σ_3) at this point (small unit of rock mass) are not dependent on the initial stress state of the rock mass, the spatial location of the rock mass and the additional load on the rock mass. The ratio is also different. Under uneven three-way stress system, rock stability depends on three-dimensional rock strength. According to the hypothesis of “ultimate strength limit”, when the three main stresses