CAJ | 학술논문

为了研究煤层瓦斯渗透作用对煤与瓦斯突出的影响，研制了一维渗透失稳试验装置并进行了试验。试验装置包括煤样室、模拟巷道、煤样压实装置、注气系统以及气压测量系统。煤样室采用多节拼装的形式，以方便煤样室气压梯度的观测以及保证每节煤样室的煤样有相同的压实度。煤样的粒径小于4.75 mm，经15 MPa 的压力压实，煤样室的内径为199 mm，煤样室总长度为1000 mm，采用球阀作为揭煤装置，球阀孔径为40 mm，揭煤时未对煤样施加轴向压力。试验结果表明：煤层发生渗透失稳时的临界气压梯度为3.12 MPa/m。基于渗透失稳的观点，分析了“口小腹大”突出空洞形状的成因及各种控突措施的作用机制。
위료연구매층와사삼투작용대매여와사돌출적영향，연제료일유삼투실은시험장치병진행료시험。시험장치포괄매양실、모의항도、매양압실장치、주기계통이급기압측량계통。매양실채용다절병장적형식，이방편매양실기압제도적관측이급보증매절매양실적매양유상동적압실도。매양적립경소우4.75 mm，경15 MPa 적압력압실，매양실적내경위199 mm，매양실총장도위1000 mm，채용구벌작위게매장치，구벌공경위40 mm，게매시미대매양시가축향압력。시험결과표명：매층발생삼투실은시적림계기압제도위3.12 MPa/m。기우삼투실은적관점，분석료“구소복대”돌출공동형상적성인급각충공돌조시적작용궤제。
In order to inspect the influences of gas seepage on the outburst of coal and gas, a set of device was made. The device includes coal sample cell, simulated roadway, device for compaction of coal sample, gas injec-tion system and gas pressure measuring system. Several sample cells were assembled to observe the gas pressure gradient and ensure the same compactness of all coal samples. The grain size of coal samples was smaller than 4.75 mm. Coal samples were compacted at 15 MPa . The inner diameter of sample cell is 199 mm and its length is 1 000 mm. Ball valve was made as uncovering coal apparatus and its inner diameter is 40 mm. No axial pressure was loaded on coal samples during tests. The uncovering coal tests showed that the critical gas pressure gradient was 3.12 MPa/m. From the view of permeation in stability of coal containing gas, the process of the holes with small mouth and big belly as well as the principle of controlling outburst measures were analyzed.