矿山压力对煤矿瓦斯涌出影响实验分析及其控制

为了在室内再现工作面煤岩瓦斯涌出量随开采过程矿山压力变化的响应过程,利用自主研发的温度-压力耦合气体运移实验系统,进行了应力状态改变下的气体解吸-运移室内模拟实验。实验中在恒温条件下对煤样进行单轴压缩破坏和施加围压两个应力变化过程,实验全过程实时监测逸出气体压力、流量,并抽样检测气体浓度和成分。实验结果表明逸出气体压力和流量随应力状态变化相应明显:气体在样品破坏和围压降低瞬间出现了负压现象;逸出气体流量与应力状态变化呈近似正相关规律且流量变化略滞后于应力状态改变。结合现场经验提出了以"短壁梁理论"为基础的110工法的矿山压力控制对策,以唐山沟8820工作面液压支架压力监测情况为例展示了其对周期来压的控制效果。

Experimental analysis of mine pressure influence on gas emission and control

In order to reproduce the process that how the mining forces affect the gas emission in lab,a temperature-pressure coupled gas migration experimental system was used to simulate the gas migration progress with the changing stress state.The experiment was conducted under a constant temperature condition and two types of stress were applied on the coal sample：uniaxial pressure and confining pressure.The authors monitored gas pressure and gas flow throughout the whole process.At the same time the authors did the sampling detection of gas concentration and composition.The experimental results showed that the gas pressure and flow rate changed obviously.For instance,the gas pressure was negative when the sample was broken.The variation of the gas flow between the stress states is similar and the flow change is slightly lagging behind the stress state.Combined with field experience,the author proposed the “110 mining method” which based on the short wall beam theory to control the underground pressure.The monitoring data of hydraulic support system in Tangshan Gou 8820 working face pressure showed the control effect for the periodic pressure.