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在三轴渗流仪的基础上自主研发出一种气固耦合三轴伺服渗流实验装置,以坚固性系数f小于0.5的原煤试件为研究对象,结果表明:坚固性系数在0.26~0.48范围内的松软构造煤在应力-应变加载过程中同样经历了5个阶段,然而在坚固性系数较小时则表现为应力跌落范围的逐渐减小或消失;从同一矿区制取的原煤试件瓦斯渗透率随着坚固性系数的增加而增大,且符合二次多项式K=af2+bf+c。
Based on the three-axis seepage flowmeter, a gas-solid coupling three-axis servo-flow experimental device was independently developed. The raw coal samples with solidity factor f less than 0.5 were taken as research objects. The results showed that the solidity coefficient ranged from 0.26 to 0.48 Of soft temper coal also experienced five stages in the stress-strain loading process, however, when the solidity coefficient is small, it shows a gradual decrease or disappearance of the stress drop range. The gas permeability of raw coal samples taken from the same mining area With the increase of the ruggedness coefficient increases, and in line with the quadratic polynomial K = af2 + bf + c.