煤与瓦斯突出实验加压方式及其对煤体受力的影响分析

物理相似模拟实验是进行煤与瓦斯突出机理研究的主要方法之一。现有突出模拟实验装置逐渐向大尺寸发展，提高了对实验装置力学加载能力的要求。统计分析了现有三维煤与瓦斯突出模拟实验装置的力学加载系统的类型及特点，发现目前主要采用多组液压缸分布加载或提高力学加载系统刚度、液压缸加载能力两种方式解决大尺寸下突出模型的力学加载问题；同时利用COMSOL模拟软件固体力学模块分析了平板型、梯型两种压板结构对突出煤体应力变形的影响，结果表明，采用梯形结构压板时，可相对提高力学加载系统对突出煤体施加应力的均匀性。

Analysis of experiment pressurization method of coal and gas outburst and its influence on coal stress

Physical analog simulation experiment is one of the main methods to study the mechanism of coal and gas outburst. Due to the development of large-scale outburst simulation experimental devices, the demand for the mechanical loading capacity of this devices is increased. By statistically analyzed the types and characteristics of the existing mechanical loading system of the three-dimensional coal and gas outburst simulation experimental device. It is found that at present, the mechanical loading problem of the large-scale outburst model is mainly solved by two methods, that is, the distribution loading of multiple groups of hydraulic cylinders or by improving the rigidity of the mechanical loading system and the loading capacity of hydraulic cylinders; at the same time, the solid mechanics module of COMSOL simulation software is used to analyze the influence of different pressure plate structures (flat plate type and trapezoidal type) on the stress and deformation of outburst coal. The results show that the homogeneity of stress exerted by mechanical loading system on outburst coal can be improved relatively when trapezoidal structure plate is used.