1620 工程科学学报，第42卷，第12期 100 Before blasting After blasting 0.018 Before blasting！ After blasting 90 (a) (b) 一V 0.05 一F1 7 ◆F 0.012 62 一F3 0.01171 38.0 F 001606 0.009 00832 4 0.006 20 0.003 10 14 16 18 10 12 14 16 Tme/d Time/d 100 After blasting 0.020 Before blasting After blasting 9 0.018 (d) 78.1 0.016 F 00 693 0.014 0.0130 0.012 001203 5 0.010 001013 0.00881 0.008 28.0 274 0.006 -000441 0.004 ---0.00407 0.002 10 12 14 16 18 10 12 141618 Time/d Time/d 185 (e) Double hole 70 220 8 40 (① Single hole 34 Double hole 60 ☑Net increase Single hole 48 ☑Net increase 30 8 44.4 50 165 25 389 33 5 17 20 30 110 74 10 0 55 D: D, D D, D Number of test hole Number of test hole 图12煤层深孔聚能爆破前后各个考察孔内瓦斯体积分数及纯流量变化规律.(a~b)单孔爆破：(c~d)双孔爆破：(e~)单/双孔对比 Fig.12 Variations in gas volume fraction and gas pure flow in each test hole before and after cumulative blasting:(a-b)single-hole blasting;(c-d) double-hole blasting:(e-f)single-/double-hole blasting comparison 100 0.018 Before blasting After blasting Before blasting After blasting 90 (a) (b) 0.015 80 一F, 0.012 F 002 66.9 6 -V3 0.01035 0.00 F 4 0.006 -==0.0048 ==0.0047 30 0.003 20 : 10 10 12 16 10 12 1416 18 Time/d Time/d 图13 煤层深孔聚能爆破后各个考察孔内瓦斯体积分数()及纯流量(b)对比图 Fig.13 Comparison of gas volume fraction (a)and gas pure flow(b)in each test hole0 2 4 6 8 10 12 14 16 18 10 20 30 40 50 60 70 80 90 100 Gas volume fraction/ % Time/d 0 2 4 6 8 10 12 14 16 18 10 20 30 40 50 60 70 80 90 100 Gas volume fraction/ % Time/d Time/d 0 2 4 6 8 10 12 14 16 18 0 0.003 0.006 0.009 0.012 0.015 0.018 Pure gas flow/(m3·min−1 ) Time/d 0 2 4 6 8 10 12 14 16 18 0.002 0.004 0.006 0.008 0.010 0.012 0.014 0.016 0.018 0.020 Gas pure flow/(m3·min−1 ) 37 74 111 148 185 D2 D3 D4 Double hole Single hole Average increase in gas volume fraction// % Number of test hole D1 D2 D3 D4 Number of test hole D1 0 10 20 30 40 50 60 70 Net increase Double hole Single hole Net increase Net increase/ % 55 110 165 220 Average increase in pure gas flow/ % 0 10 20 30 40 Net increase/ % V1 V2 V3 V4 Before blasting After blasting 28.5 28.0 27.7 26.2 66.2 58.0 47.5 45.0 (a) F1 F2 F3 F4 0.00398 0.00406 0.00455 0.00465 0.00782 0.00839 0.01006 Before blasting After blasting 0.01171 (b) V1 V2 V3 V4 Before blasting After blasting 78.1 69.3 57.1 50.9 28.0 27.4 26.6 25.3 F1 F2 F3 F4 0.00407 0.00441 0.00466 0.00481 0.00882 0.01013 0.01203 Before blasting After blasting 0.01380 (d) 38.9 45.8 44.4 33.5 (e) 25 34 38 17 (f) (c) 图 12    煤层深孔聚能爆破前后各个考察孔内瓦斯体积分数及纯流量变化规律. （a～b）单孔爆破；（c～d）双孔爆破；（e～f）单/双孔对比 Fig.12    Variations in gas volume fraction and gas pure flow in each test hole before and after cumulative blasting: (a−b) single-hole blasting; (c−d) double-hole blasting; (e−f) single-/double-hole blasting comparison 0 2 4 6 8 10 12 14 16 18 Time/d 0 2 4 6 8 10 12 14 16 18 Time/d V7 V1 V6 V2 F7 F1 F6 F2 10 20 30 40 50 60 70 80 90 100 Gas volume fraction/ % Before blasting After blasting 0 0.003 0.006 0.009 0.012 0.015 0.018 0.01306 0.01236 0.01167 0.01035 Gas pure flow/(m3·min−1 ) Before blasting After blasting 0.00440 0.00446 0.00470 0.00482 73.8 71.0 66.9 60.7 28.6 28.0 27.2 26.9 (a) (b) 图 13    煤层深孔聚能爆破后各个考察孔内瓦斯体积分数（a）及纯流量（b）对比图 Fig.13    Comparison of gas volume fraction (a) and gas pure flow (b) in each test hole · 1620 · 工程科学学报，第 42 卷，第 12 期