CAJ | 학술논문

为分析饱水时间对煤体的力学性质与冲击倾向性指标的影响，对千秋煤矿2#煤层自然和饱水7～28 d处理后煤样，在RMT-150B岩石力学试验系统进行冲击倾向性指标测定。结果表明：在自然与饱水状态下，煤样的抗压强度与弹性模量、峰前积蓄能量和冲击能量指数均成正相关。饱水煤样的抗压强度、弹性模量、冲击能量指数以及峰前积蓄能量均有不同程度降低。饱水7～10 d后煤的力学性质和冲击倾向性指标变化显著，而后有所减缓。在自然含水状态下，2#煤层属于中等冲击类(II类)，饱水7～28 d后2#煤层的冲击倾向性指标有较大降低，由中等冲击类变为弱冲击类(弱II类)；建议千秋煤矿采煤工作面注水超前时间7～10 d，超前距离约30 m为宜。
위분석포수시간대매체적역학성질여충격경향성지표적영향，대천추매광2#매층자연화포수7～28 d처리후매양，재RMT-150B암석역학시험계통진행충격경향성지표측정。결과표명：재자연여포수상태하，매양적항압강도여탄성모량、봉전적축능량화충격능량지수균성정상관。포수매양적항압강도、탄성모량、충격능량지수이급봉전적축능량균유불동정도강저。포수7～10 d후매적역학성질화충격경향성지표변화현저，이후유소감완。재자연함수상태하，2#매층속우중등충격류(II류)，포수7～28 d후2#매층적충격경향성지표유교대강저，유중등충격류변위약충격류(약II류)；건의천추매광채매공작면주수초전시간7～10 d，초전거리약30 m위의。
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.