采空区对金属矿地下采场爆破地震效应的影响
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摘要
采用速度传感器测定多采空区下中深孔爆破强制崩矿产生的地震效应,分析同段雷管起爆的药量、空区状况及介质所处位置与主要爆破自由面的空间关系,对介质峰值质点速度(PPV)产生的影响。研究结果表明:控制最大一段药量有利于维护采场和井下构筑物的稳定;采空区的存在,通过使爆破地震波绕射并耗散其能量,对远离爆破作业点介质的PPV值,起到不同程度的衰减作用;在其他条件基本相同的情况下,爆破作用使主要爆破自由面正后方介质产生的PPV值,明显大于自由面侧向介质产生的对应值。
A study was conducted to investigate on the ground vibration effect from a block caving by ring holes blasting in underground strata with gob areas in Changba mine.The maximum peak particle velocity(PPV) of rock in different localities was tested.The effect of the explosive weight per delay fired in a blasting round,gob areas locating between the blasting site and monitoring points,and the spatial relation between the main blasting free surface of rock and a given monitoring locality on PPV was analyzed.This study shows that an opportune explosive weight adopted per delay fired in a blasting round benefits the safety of underground workings adjacent to the blasting site.The gob areas somewhat reduce the PPV magnitude of rock far from the blasting site by their interfering in the propagation of blasting seismic wave in rock.It is found that the PPV magnitude of rock in the rear of the main free surface of ring holes blasting is higher than that in other localities under the same other conditions.
A study was conducted to investigate on the ground vibration effect from a block caving by ring holes blasting in underground strata with gob areas in Changba mine.The maximum peak particle velocity(PPV) of rock in different localities was tested.The effect of the explosive weight per delay fired in a blasting round,gob areas locating between the blasting site and monitoring points,and the spatial relation between the main blasting free surface of rock and a given monitoring locality on PPV was analyzed.This study shows that an opportune explosive weight adopted per delay fired in a blasting round benefits the safety of underground workings adjacent to the blasting site.The gob areas somewhat reduce the PPV magnitude of rock far from the blasting site by their interfering in the propagation of blasting seismic wave in rock.It is found that the PPV magnitude of rock in the rear of the main free surface of ring holes blasting is higher than that in other localities under the same other conditions.
引文
[1]陈华腾,牛强,谭胜禹,等.爆破计算手册[M].沈阳:辽宁科学技术出版社,1991.
[2]胡萌.安庆铜矿高阶段大直径深孔爆破地震效应的浅析[J].铜业工程,2003,(3):10-12.
[3]孙豁然,肖海军,王运森,等.爆破动载荷下平硐稳定性的研究[J].金属矿山,2001,(12):15-18.
[4]石玉成,王兰民,林学文.黄土场地的爆破地震振动效应[J].岩石力学与工程学报,2003,22(11):1933-1938.
[5]Singh P K.Blast vibration damage to underground coal mines from adjacent open-pit blasting[J].Rock Mechanics and Mining Sciences,2002,39:959-973.
[2]胡萌.安庆铜矿高阶段大直径深孔爆破地震效应的浅析[J].铜业工程,2003,(3):10-12.
[3]孙豁然,肖海军,王运森,等.爆破动载荷下平硐稳定性的研究[J].金属矿山,2001,(12):15-18.
[4]石玉成,王兰民,林学文.黄土场地的爆破地震振动效应[J].岩石力学与工程学报,2003,22(11):1933-1938.
[5]Singh P K.Blast vibration damage to underground coal mines from adjacent open-pit blasting[J].Rock Mechanics and Mining Sciences,2002,39:959-973.
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