In light of the problem that the related triaxial stress seepage experiment devices lack of high pressure water and negative pressure loading function at present

the gas seepage law of coal samples cannot be studied under both of these cases. A kind of new triaxial stress seepage experiment device has been developed

of which the export negative pressure of coal sample itself is adjustable and the high pressure water can be loaded to the coal sample. The device is mainly composed of five parts including triaxial stress loading system

gas seepage system

hydraulic fracturing control system

gas flow test system

sensing and control system

all sorts of uniaxial and triaxial seepage experiments can be carried out in the case that samples are loaded by high pressure water or the negative pressure. Studies have shown that the device can simulate the gas migration law about coal body when the pressure of extraction drill hole is negative and can investigate the hydraulic fracturing effect of coal

complete the research about gas seepage law of coal sample under negative pressure condition

at the same time accomplish the inspection about the anti-reflection effect of coal body after hydraulic fracturing measures implemented in the laboratory.