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在模拟煤与瓦斯突出的激波管实验中发现，按瓦斯初压大小存在两种破坏模式：低压开裂和高压突出．在低压开裂模式中发现了层裂现象：破坏区煤样分成数段，每段的厚度大致相等，段间裂缝的宽度在毫米量级．用准静态层裂模型来讨论层裂现象，分析认为，层裂段的特征长度是煤的拉伸强度和侧壁摩擦力的比值．计算结果说明：（１）层裂段的个数随气体初压的变化关系与实验相符；（２）层裂的产生是个快过程，可忽略渗流；（３）裂缝的发展是个慢过程，由渗流和侧壁摩擦共同控制．
In simulating the shock tube experiment of coal and gas outburst, it is found that there are two kinds of failure modes according to the initial pressure of gas: low pressure cracking and high pressure protrusion. In the low-pressure cracking mode, the phenomenon of delamination was found: the coal sample in the failure zone was divided into several sections, the thickness of each section was approximately the same, and the width of the cracks between the sections was on the order of millimeters. The quasi-static model is used to discuss the splitting phenomenon. It is considered that the characteristic length of the stratified layer is the ratio of the tensile strength of the coal to the friction of the sidewall. The calculation results show that: (1) the number of layer fissures agrees well with the experimental data; (2) the fissure is a fast process and the seepage can be ignored; (3) the fissure development is a slow process and Seepage and sidewall friction joint control.