(1. Key Laboratory for Exploitation of Southwestern Resources and Environmental Disaster Control Engineering，Ministry of Education，Chongqing University，Chongqing 400044，China；2. Henan Provincial Coal Seam Gas Development and Utilization Co.，Ltd.，Zhengzhou，Henan 450016，China)
Abstract：In order to ensure the better effect of coal and gas outburst simulation experiment，aiming at shortages of originally developed simulation test platform，the outburst mould and its additional coal forming device have been improved and developed. Using the technologies of ring direction and surface sealing，etc.，omnidirectional sealing，good sealing result for a long time under 2 MPa gas pressure is obtained. With three groups of different circular outburst port diameters，different outburst port experiments of coal and gas outburst simulation under non-replace outburst mould can be conducted，which is economical and practical. Depending on connection between existing temperature，pressure sensors and its additional test control software，real-time monitoring of change law of coal temperature and gas pressure in the process of outburst can be realized conveniently. The separated coal sample molding equipment can add the preconcerted compacting pressure accurately；and it is well established for its flexible operations. The simulation tests carried out by the improved coal and gas outburst simulation test device indicate that there are threshold values of gas pressure and outburst aperture which affect coal and gas outburst occurring or not. When they are greater than the threshold values，the outburst intensity will increase with the increase of the gas pressure or outburst aperture. As the power of outburst，the gas pressure has a certain porphyrization effect on the outburst coal powders. In addition，the temperature change of coal body during coal and gas outburst process has also verified that it is thermopositive when coal absorbs gas，while it is decalescent with releasing gas.
