饱水时间对千秋煤矿2#煤层冲击倾向性指标的影响

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Abstract To analyze the influence of saturation period on the mechanical properties and bursting liability indices of coal mass，the bursting liability indices were tested on the specimens of coal seam #2 in Qianqiu coal mine with natural water content and saturation for 7–28 d，respectively. The results show that，under natural and saturation states，the elastic modulus，impact energy index and pre-peak accumulated energy of the coal specimens are all positively correlated with the compression strength. Water saturation of the coal specimens can decrease their compression strength，elastic modulus，impact energy index and pre-peak accumulated energy in different degrees. The saturation period of 7–10 d for the coal specimens has a significant effect on their mechanical properties and bursting liability indices；after then，the influence degree would decrease. Under natural state，the bursting liability of coal seam #2 belongs to moderate impact type(type II). After the saturation period of 7–28 d，the bursting liability index decreases obviously，and becomes weak impact type(weak type II). Therefore，it is suggested that the water should be injected about 7–10 d in advance at the coal face of Qianqiu coal mine，and the distance in front of the face should be about 30 m.

Key words： mining engineering rockburst water saturation bursting liability elastic energy impact energy dynamic failure time

Received: 08 April 2013

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https://rockmech.whrsm.ac.cn/EN/Y2014/V33/I2/235

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