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</div> <!-- D start --> <!-- 正文 --> <div class="mainbody"> <div style="display:none"> Series No. 334  ???? ?W?334 ?   2004q?W?4 ? April 2004 METAL MINE ???????????????????? ??? ????????) ??z张 ?? (??????I??) ( ???q??????I??????,??????????????,???????????q??? ?????,???????45 % ,????????????,????????????????????? ???????????????U????? Calculation of Reasonable Pre2splitting Blasting Parameters of East Intensive Mining Area of Gushan Pit Li Dapei Gushan Mining Co. , Ma Steel) ) Liu Weizhou Zhang Xiliang ( Maanshan Institute of Mining Research)   ( Abstract   The method for calculating pre2splitting blasting parameters was modified through substantive experiment study and theoretical analysis. The obtained reasonable experimental parameters were validated in fieldwork ,achieving a 4 5 % increase of presplitting blasthole spacing and a good presplitting blasting effect , which effectively solved the vibration effect problem in the intensive blasting of the east side of Gushan mining area. Keywords   Pre2splitting blast , Large blasthole spacing , Uncoupled explosive charge , Linear charge density   ??l???????????,?????? ???????????U??,??????开 ? www.zssxnt.live ??????????,??????????? ?????q??30 ?m ,?????????1? ???????????,?开 ????????, ?????l????,?????l????_???? q?U?q??????l??????,??????? ????????? q???: (1) ????????????????? ?; ( ( ( 2) q???????往 往 ???q???; 3) ????????; 4) ???????????E??,???? ?1 ?????? ????????; ?????????????????,?? ?D??????????????W??p??D??? ????,????????????????? ?????:W??p???????,??????, ????U???;??????W??p?????? ??,????????????????,??z? ????????{??????????,??? ?现???”等 ??????????,????? ???E??,?????一 ?????????? ? ?,?????????????? ( 5) ???开 ?????????????? ???????????????????? [1 ] E??,?????E?? ? ????????????一 ????1. 5 m ,?????一 ?????????????? ?????????????、降 ??????? ?????? 2 ????? ??????????????????一 ? 1 ????? ???, ???????????????l??, ?U??E?? 243184 ?????????????? , ???????85 %??q??????开 ? ?20 ?   ???{?:????????????????????2004 q?W?4 ? ???????往 往 ?q???????????? ?????,q????????一 ??????? ???????_??????????????? 往 往 ?????????? ??,σ ?????????????,MPa? N ???(5) ??????????????? ??????一 ??????U??????U? ??????????????: [ 2 ] ??????????????? : (1) ???????????????,??_? ??????? 2 Cd - 6 PB = 228 ?10 ?ρ ?1 e , (1) e + 0. 8ρ ( 2) ????????q?????,????? ??, PB ?????????,MPa;ρ ???? e ???????????? 3 2 ?,g/ cm ; Cd ?????,m/ s ? ??I??????????,??????? 一 ???????????往 往 ?????, ???????q?c??????,???q?一 ?? [ 2 ] [3 ] ??? : ????????????? 0. 7 : 112 - 1. 5 Ve V b d 2. 4 , v = 700 Q ?L , PBe = PB ? = PB ? C1 D (2) ??, v ?????,mm/ s; Q ????,kg; L ?? ??????,m? ??, PBe ?I???????????,MPa; V e ? 3 3 ???U?,m ; V b ????U?,m ; C1 ????? ???(q?l???C1 = 1) ; d ?????,mm; D ? ????, mm? ?q??,??????????,??U???? ??????????3? ?I????????????,?????? ????????最 ????,??????,?? ?????????????????,???? ???~?;????q??,往 往 ???????,q? www.zssxnt.live ????U?????????~???2 ???U?? ?????0. 9 m ?????????????? ?????????q??U?? ?3 ??U?????、不 ??????????? U???????????、孔 ?、岩 ?{???? ?,????,?????????????q??? ?????????????????p??? [ 2 ] 4 ? ?2 ?????????????q? ????????????????开 ,?? ?????????????????????? ?????????????,????????: PBe ?D ?( S - D) ?Rt D ?( PBe + Rt) (3) S ? , (4) Rt ??, S ???,m; D ???,mm; Rt ????? ??, MPa? ????????????????,?(4) ? ?4 ?????U?????????p? ?????: 3   ????? ?????????、孔 |???、装 ?l???? D ?( PBe + Rt +σ N) S ? , (5) Rt +σ [4 ] N ~????c???????????????? ?21 ? ?W?334 ?????2004 q?W?4 ? ????????,l????????U????? ??1?2 cm ???~??q?????????,? ???????????~?????????~?? 一 ?q?l???,?????????????~?? ????????????,??????,??? ???,??????????70 %?80 %??? ????????????~?,?????? ???,?????????????????? ???????,?????????????l? ???5 所 C?? ??????: 2 d C - 6 PB = 228 ?10 ?ρ 2 111. 96 MPa1 ???????: ? e 1 + 0. 8 ρ e = d 2. 4 = 179. 4 MPa1 = 3. 14 m , PBe = PB ? C1 D ??: D ?( PBe + Rt) Rt S ? ??????S = 3 m q????,??????? (4) ?????Q ? Q = q1 ( L - T + 1) , ??, T ????D???,l???3 m; q1 、L ??? ( 5) ??l?????2? ?2 ???(??????) ????? ?5 ??????l?? ?? ?? U??? ?? / (kg分m - 1 ???????? ???D????? ?? / m ??? p?? ??????l?????????q????? ??????????????????,??? ?????90安后 退 ???,????????? q???75安预 ??????6? / m ) / kg 28. 4 32. 9 37. 8 42. 3 / m / m 8 8. 3 9. 3 2. 8 2. 8 2. 8 2. 8 4. 5 4. 5 4. 5 4. 5 3 3 9 3 3 1 0 10. 4 11. 4 3 3 1 1 3 3 www.zssxnt.live 4 l?? ?q?????????所 q????????I? ?????,???????????????? ?,???????????q????????,? ??????????,??????????3 m ,????45 %??,??????????? ?????????技 ???????,l???? ????技 ??????,?????????? ????D?????????所 ???????? ?q?一 ????,?????????? ?6 ???q??90帮钻 ???? ??????XJ - 1 ?????????? # ???q??,??2 ???????,????? ???????,???????? ??????????1? ?1 ???????? ? ? ? ? ?? ???? / MPa ???? / MPa ???? p?? - (g分cm 3) / 1 2 ???,???1 ???????技 ??q??1 ??:???? ??C?,2002 3 . 44?4. 07 12. 2 157 12?16 Day , P R &W K Webster. Controlled blasting to minimize over2 break with big borehole underground. CIL Inc. CIMM Annual Meeting , Calgary , Albertam , 1981   所 ?????????,??Cd = 3 900 m/ s , 3 ??ρ e = 1. 2 g/ cm ,??D = 200 mm? ( 1) ?????L ? L = H/ sin , ??, H ?????, m; ?????, () ? 3 4 Calder , P N & A Bauer1Pre2split blast design for open pit and un2 derground mines. Fifth International Congress on Rock Mechanics , Melbourne , 1983 ???. ?????E?. ??:??????C?,1993 ( 2) U?????q1 ? - 5 2 (?E???2003212210) q1 = 11. 3 ?10 D = 4. 5 kg/ m? 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