煤与瓦斯突出的二维模拟实验研究

2D SIMULATION TEST OF COAL AND GAS OUTBURST

介绍了自行设计、加工的模拟煤与瓦斯突出的二维实验装置及配套的压力数据自动采集处理系统。在二维模拟实验装置上做了一系列的实验。实验发现，煤样的破坏存在“开裂”和“突出”两类典型的破坏形式，破坏阵面的前沿以拉伸强间断的形式向外传播；煤体破坏的初期是轴对称的，而后则只在某一方向上向外扩展，而且破坏阵面的扩展速度是逐渐衰减的，不存在恒稳推进，在煤体破坏过程中，应力重新分布，并有４种不同的应力转移形式。这些结论对于认识煤与瓦斯突出的机理是十分有益的。

D(two-dimensional)set up for simulation of coal and gas outburst and an automatic data acquisition and processing system are described. A series of simulation tests are made. It is found that there are two types of coal failures, namely, the fracture type and outburst type. The fracturing front propagates outward in the form of strong tensile interruption, and coal failure is axially symmetrical in the initial period. It then propagates outward only in one direction. The propagation velocity of fracturing front drops gradually, and constant propagation does not exist. In addition, it is also found that stress field redistributes in the process of coal failure, and that there are four forms of stress shift. These findings are beneficial to recognition of the mechanism of coal and gas outburst.