针对我国主要煤层气产区的煤层埋深、煤层厚度、煤层及顶板岩石力学特性,对不同埋深和煤层厚度条件下的裸眼洞穴使用有限差分方法进行了数值模拟.计算结果表明,造成洞穴顶板塌落的主要力学因素是垂直地应力与水平地应力之差,可由侧压系数来描述;顶板破坏形式为洞周剪切破坏;煤层厚度对其影响较小. Aimed at the coal seam depth, coal seam thickness, rock mechanics characteristics of coal seam and roof in the main coalbed methane producing areas in China, the finite difference method for the open hole caves under different burial depths and coal seams thickness was numerically simulated.The calculation results show that the cavern roof The main mechanical factors of slump are the difference between vertical stress and horizontal stress, which can be described by lateral pressure coefficient. The failure form of roof is shear failure of tunnel and the influence of coal seam thickness is small.