基于气固耦合作用条件下的煤与瓦斯突出物理模拟试验结果，分析了突出过程中的温度-气压-应力体系演化过程，从热力系统能量守恒的思想出发，探讨了突出过程中多变指数的实时演化，并根据动态变化的多变指数推导出了多变过程中的瓦斯膨胀能的计算方法，在此基础上讨论了突出过程中的能量释放问题。研究结果表明:煤体不同区域的应力变化在突出过程中共呈现3种类型，即:初始下降-波动升降-平稳回升型、初始上升-小幅下降-平稳回升型和小幅下降-平稳回升型;煤体内瓦斯压力变化过程呈现两种类型，即:初始下降-波动升降-平稳下降型与平稳下降型;煤体温度则在突出过程中表现为单一的持续下降过程。煤体卸压区和应力集中区在突出前期为定温-定压-定熵相互转换的多变过程，突出中期为定温过程，突出后期为定温-定压相互转换多变的过程;应力升高区在突出前期为定温-定压相互转换的多变过程，突出中期至后期主要表现为定温过程;原岩应力区在突出前期为定温-定压相互转换的多变过程，突出中期至后期处于一个定温-定压-定熵相互转换的多变过程。突出过程中煤体的弹性应变能释放主要来自于应力集中区和应力升高区，煤体内各区域的弹性应变能的释放都会经历一个下降随后回升的现象，且该过程中各区域的弹性能不会一次性完全释放。突出过程中越靠近工作面区域释放的瓦斯膨胀能越大，膨胀能的释放并不是一个连续的过程，而是呈现阶段波动式，这种波动在突出后期尤为明显。根据本文的研究，在煤体物理力学性质确定的前提下，单独释放弹性应变能或瓦斯膨胀能都可以达到降低突出发生风险的目的，若同时对两者进行处理，则突出风险降低的概率更大。

In this paper,based on the physical simulation results of coal and gas outburst under the condition of gas- solid coupling,the evolution process of temperature-pressure-stress during outburst was analyzed. Considering the con- servation of energy in the system,the real-time evolution of polytropic exponent in outburst process was discussed,and the calculation method of gas expansion energy in the polytropic process was derived. On this basis,the problem of en- ergy release in outburst process was discussed. The conclusions indicate that there are three types of stress changes in different parts of the coal body:initial decrease-fluctuating rise-stable rise type,initial rise-slight decrease-stable rise type and slight decrease-stable rise type. There are two types of gas pressure changes:initial decrease-fluctuating rise- stable decrease type and slight decrease type. The temperature appears as a single continuous decline process during outburst process. The relief stress zone and concentrated stress zone are the polytropic process of isothermal process-i- sobaric process-adiabatic process in the early stage of outburst,the mid-term is an isothermal process,and the late stage is the polytropic process of isothermal process-isobaric process. The increased stress zone is a polytropic process of isothermal process-isobaric process in the early stage of outburst,and the main stage is an isothermal process in the middle to the late stage. The original stress zone is a polytropic process of isothermal process-isobaric process in the early stage of the outburst,and it is an isothermal process-adiabatic process from the middle to the late stage. During outburst process,the release of elastic strain energy of the coal body mainly comes from concentrated stress zone and increased stress zone. The release of the elastic strain energy of various parts of coal body will show a phenomenon of first drop and then rise,and the elastic energy of each area will not be completely released at one time. The gas expan- sion energy released closer to the working face during the outburst process is greater. The release of gas expansion en- ergy is not a continuous process,but presents a stage of volatility,which is particularly evident in the later stages of outburst.

1 试验系统及方法

   1.1 取样地点概况

   1.2 试验系统

   1.3 试验方法

2 试验结果

   2.1 突出热-流-固参数演化

   2.2 突出过程多变指数的演化

   2.3 突出过程中的能量转换

3 结论