含瓦斯煤的有效应力与力学变形破坏特性

本文在含瓦斯煤的力学变形与破坏机制理论分析和实验基础上，提出含瓦斯煤的变形与破坏受双重有效应力作用，本体应力决定煤的本体变形性质，而结构有效应力则决定煤的结构变形性质，修正了Karl Terzaghi多孔介质有效应力计算公式，揭示了等效有效孔隙压力系数在含瓦斯煤全程应力应变过程中的变化规律；分析了煤吸附瓦斯后含瓦斯煤强度降低的机理，根据含瓦斯煤变形特征，提出了控制煤与瓦斯突出的途径和方法。

The Effective Stress and Mechanical Deformation and Damage Characteristics of Gas-filled Coal

Based on the analysis of deformation and damage of gas-filled coal, this paper proposes that the deformation and damage of gas-filled coal are affected by double effective stresses. Primary stress determines the primary deformation while structural effective stress determines the structural deformation. This paper also corrects the formula of Karl Terzaghi effective stress and reveales the changing law of effective porous pressure coefficient during the whole stress-strain course. Based on the deformation characteristics of gas-filled coal, the approches and methods for controlling coal and gas outburst are also provided.