Chapter 8BlastingforRock and SoilThemain contents:1.1Open-pit deephole benchblasting1.2Open-pitshallowholebenchblasting1.3 Deep hole blastinginunderground mining,works1.4Shallowholeblastingof undergroundstops1.5Collisionblasting1.6Springingshotandsecondaryblasting（ellipsis）1.7Mechanizationofgunpropellant（ellipsis）2016/11/9Chapter8BlastingforRockand
2016/11/9 Chapter 8 Blasting for Rock and Soil 2 The main contents: Chapter 8 Blasting for Rock and Soil 1.1 Open-pit deep hole bench blasting 1.2 Open-pit shallow hole bench blasting 1.3 Deep hole blasting in underground mining, works 1.4 Shallow hole blasting of underground stops 1.5 Collision blasting 1.6 Springing shot and secondary blasting（ ellipsis ） 1.7 Mechanization of gun propellant （ ellipsis ）
Section1DeepHoleBenchBlastinginTheOpenAirBenchblastingBench blasting is the workingface advanceblasting method in step formDrillingholedepthisgreaterthan5mcalledlonghole,otherwiseit iscalledashallowholeThestepelementsW, Toe burdenI.Charginglengthh SubdrillingIdBlocklength;b Row spacingLDrillingdepthB is a safedistancefromthe drilling centertothetop line on the steps2016/11/9Chapter8BlastingforRockand
2016/11/9 Chapter 8 Blasting for Rock and Soil 3 Section 1 Deep Hole Bench Blasting in The Open Air Bench blasting is the working face advance blasting method in step form 。 Bench blasting Drilling hole depth is greater than 5 m called long hole ,otherwise it is called a shallow hole The step elements W1 Toe burden L Drilling depth lc Charging length ld Block length； h Subdrilling b Row spacing B is a safe distance from the drilling center to the top line on the steps
Bench factors
Bench factors b B H Ll L2 W W1 h L a
Drilling2.5~3mWArrangement ofopen-pitdeepholeH-Bench heighth-The subdrilling;WdChassis resistance line;dBlocklength；b-Rowspacing2016/11/9Chapter8BlastingforRockand
2016/11/9 Chapter 8 Blasting for Rock and Soil 5 Drilling Arrangement of open-pit deep hole H—Bench height ；h—The subdrilling ； Wd—Chassis resistance line ； ld—Block length ；b—Row spacing
(1)Hole Arrangement Form1DeepholebenchplaneholearrangementHoleway have single bore configuration and arrangement of the twoMore configuration holes is divided into square,rectangle and triangle (plumblossom)(b).光面或光面或台阶式边坡预裂孔预裂孔(d)(c)(b)(c)(a)-Singlehole;a-lnclinedhole;b-Theverticalb-Square holes;c-Rectangularhole；cTieringholeholes;dTriangleholesCe2016/11/9Chapter8BlastingforRockand
2016/11/9 Chapter 8 Blasting for Rock and Soil 6 a—Single hole ； b—Square holes；c—Rectangular holes ; d—Triangle holes Hole way have single bore configuration and arrangement of the two More configuration holes is divided into square, rectangle and triangle (plum blossom) 。 a—Inclined hole ；b—The vertical hole ；c—Tiering hole 1 Deep hole bench plane hole arrangement Hole Arrangement Form （1）