??????????????????????
Study on the Control Technology of Chamber
Blasting in Longjing City
?????? ?????? ?????
(????????????????????????117000)
? ???????????????÷??????????????????????????????????ò???????n??q???????????????????????????????????????????????Ч????
?????????????????????????????
1 ??????
1.1 ???????????????
÷?????????λ???????????о???????????ɡ????顢????????塣??????????????2.5km???????÷????????2.6km????????λ???????????????????????????????????÷???????????????120m??????6km???????????·????????????????????????λ?????1?????
?1 ÷???????????λ??????
Fig.1 The drawing of chamber blasting position in Meihuadong
????????????????????????????????????????ƒ=14??16?????????2800kg??m3????????140??160MPa?????????3.4??4.5MPa????????????????????????????????????á?
1.2 ????????????
???????????·???????????????????蹫·???20??m3??????????··????????似????????????????????????????????1000mm???????????????????800??1000mm???????20????????10??800mm???С??70????????С??10mm???????10????
2 ???????
2.1 ???????
÷???????????????????????????????????????????????????????????????????????????????????????????????????е???????????????????????????????????о??á?????????????????????????????????????е?豸?????????????????????????????????????????????????????????????????????????????????????????????????????????????n??q??????????????????????????????????Ч????
2.2 ???????????
2.2.1 ??????q
?????????????????(q=0.4+(V??24502)??)???????????????鷨??????????????????绯?????????????????????????D=40mm??L=4m??4?α?????????飬?????????λ????????q=1.75kg??m3??
2.2.2???????????n
???????????????????????????=40????50??????С?????W??15m???n=0.75??????>50?????n???С0.05??0.1????????С?????W??15m???n=0.65??0.70??
????÷????????????????????????????????????????????????????????????????????????????????????????n1=0.65?????????????????????n2=0.85??
2.2.3 ??С?????W
???????????????????????????????????????????????????????С?????W1??15m????????????С?????W2??21m?????2?????
?2 ??????÷?Χ
Fig.2 The affection rang of charge chamber
2.2.4 ?????
???????????????????????????????????????????????????????????????????????????????????????????????α??????l???2???????????????о????????????34m???????????35m????????????????????????????????????????0.8m??1.2m????????25.6m????????????????????0.8m??1.5m????????24.1m????????8?????????3?????
?3 ??????????????????
Fig.3 The diagram of leading passage and chamber disti"ibution
2.2.5 ????????
?????????(1)????
Q=qW3(0.4+0.6n3) (1)
????????????Ч??????????????????????3230kg???????????Q=69l73kg??
???屬??????????1??
??l ???????
Table 1 The parameters of blasting
3 ????????
?????????????????????????????????????????????????????n??g???????????????????????????????????????????????????????????????????????2?????????????????????????????????40m????16155.8kg?????????740kg???????????35.6m????49787.2kg?????????2490kg??????????????????????????????塣??????24kg 2?????????????????????????2??4???????????????
???????????????????????????????????????????Χ?????С???????????????????????????????????????????????????·??
4 ????·???
??????α?????????Χ??????????????????????????Qm=72400kg????????·???÷????????????????????????·????????????????4???α????4?????
?4 ????·????????
Fig.4 The diagram of detonating network and connection
5 ????Ч??
???α????????69263kg?????????????151000m3?????????????0.46kg??m3???????????????Ч?????????????9???????????????????????·?????????????????й??????????II??
?ο?????
[1] ???????д?飮?????????????????????磬1979.
[2] ?????У?????????????????????????????磬1999.
[3] ???????й???????????????????????????磬2004.