SAFE CHARGE QUANTITY DECIDING METHOD IN BORE HOLE BLASTING

摘要

PURPOSE: To execute an operation of a safe charge quantity L in the case that a minimum resistance wire W and a breakdown radius or a space length between bore holes are identical or different in length in a blasting including a concentrated charge and a bar state charge in a first free face and secondary free face. ;CONSTITUTION: A breakdown rock-bed volume V is set as D1×D2×W, D×W1×W2 or D1×D2×(W+N), otherwise D×((W1+N)XW2, and in the case of (D1=D2)=W, (W1=W2)=D and (D1=D2)W, (W1=W2)D, an operation of a value of a safe charge quantity L is executed by L=K×V, and in the case of (D1=D2)W and (W1=W2)D, an operation of the safe charge quantity L is executed after respective conversions to values (D1=D2)=W and (W1=W2)=D, where, K is a safety factor having a range from 0.25 to 0.45.;COPYRIGHT: (C)1994,JPO&Japio