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）
(2)Hole Arrangement Form2、Hole distribution of all cutting excavation既有铁路边坡上层边坡预裂孔预裂孔下层doubletrack expansivecuttingsingle line all cutting by layer2016/11/9Chapter8BlastingforRockand
2016/11/9 Chapter 8 Blasting for Rock and Soil Hole Arrangement Form （2） double track expansive cutting single line all cutting by layer 2、Hole distribution of all cutting excavation
Blasting Parameters(6).Unit explosive(1).Hole diameter1) Accordingtoconsumptionthe safetyconditions ofdrilling operation2)AccordingBlastingtothe(5),(2). Holecalculation ofParametersStemmingdepth andbenchheightlengthsubdrillingand holediameter3)Accordingto(3).Toeburden(4).Holethe condition ofspacing andcharge per holerow spacing2016/11/9Chapter8BlastingforRockand
2016/11/9 Chapter 8 Blasting for Rock and Soil Blasting Parameters (1). Hole diameter (6). Unit explosive consumption (2). Hole depth and subdrilling (3). Toe burden (5). Stemming length (4). Hole spacing and row spacing Blasting Parameters 1）According to the safety conditions of drilling operation 2）According to the calculation of bench height and hole diameter 3）According to the condition of charge per hole
Charging StructureBase spacing chargeColumn chargeDivided chargeDivided chargeHBase spacingchargeMixed charge1-BlockingCharging1-Blockingstructure2-Explosive2—Explosive3-Air3—Air2016/11/9Chapter8BlastingforRockand
2016/11/9 Chapter 8 Blasting for Rock and Soil Charging Structure Divided charge Base spacing charge Mixed charge Column charge 1 －Blocking 2－ Explosive 3 － Air Divided charge Base spacing charge Charging structure 1 －Blocking 2－ Explosive 3 － Air
[1]Detonating Sequence(1)Roworderdetonation(2)Rowparity-OrderDetonation(3)Wave-OrderDetonation（4）V-shapedorderdetonation(a)（5）TrapezoidalOrderDetonation（6）Diagonalorderdetonation（7)Radial OrderDetonation(b)（8）CombinedOrderDetonationRow order detonation102016/11/9Chapter8BlastingforRockand
2016/11/9 Chapter 8 Blasting for Rock and Soil 10 『1』 Row order detonation （1） Row order detonation （2） Row parity-Order Detonation （3） Wave-Order Detonation （4） V-shaped order detonation （5） Trapezoidal Order Detonation （6） Diagonal order detonation （7） Radial Order Detonation （8） Combined Order Detonation Detonating Sequence
[2]Detonating Sequence(1)Roworderdetonation(2)Rowparity-OrderDetonation（3）Wave-OrderDetonation(4)V-shapedorderdetonationh6-（5）TrapezoidalOrderDetonation（6）DiagonalorderdetonationRowparity-OrderDetonation（7)RadialOrderDetonation（8）CombinedOrderDetonation2016/11/9Chapter8BlastingforRockand11
2016/11/9 Chapter 8 Blasting for Rock and Soil 11 『2』 （1） Row order detonation （2） Row parity-Order Detonation （3） Wave-Order Detonation （4） V-shaped order detonation （5） Trapezoidal Order Detonation （6） Diagonal order detonation （7） Radial Order Detonation （8） Combined Order Detonation Row parity-Order Detonation Detonating Sequence