煤矿的生产和实践证明，发生在矿井中的动力现象具有分区和成带的特点。文章探讨了把煤、岩和瓦斯作为一个体系，采用力学方法的划分问题。根据对煤岩复合样及含瓦斯煤样在复杂应力状态下力学性质的分析，基于对Drucker-prager理论的修正和完善，建立了它们的断裂判据，并给出了计算稳定性系数和潜在弹性应变能密度的公式，提出了按这两个指标划分煤与瓦斯突出潜在危险区（带）的基本方法。

The production and practice of coal mines have proved that the dynamical phenomenon in mines have divisional and zoned characteristics. In this paper the division which treats coal, rock and gas as an integrate system by mechanical method is studied. Under study By the analysis of the mechanical property of the coal-rock composite samples and coal simples containing gas under complex stress state, the failure criterion, on the basis of the modification and consummation of the Dracker - Prager´s theory, is set up, and the formulas computing the coefficient of stability and the density of latent elastic strain energy are given. Finally, the fundamental method for deviding the potential danger region (zone) of coal and gas outburst based on the formulas is put forward.