Improve The Dragon Head Underground To The Hexagonal Into The Road Mining Blasting Efficiency

Long Shou mine is an underground mine which developed by Jinchuan Corporation in the early time. This mine divides into three pits. These are east part,middle part and west part. Ore quality in east part and middle part are good, But the ore quality in west part is bad. The mining method for Long Shou mine is Hexagon admission passage type drift-and-fill mining method. Drift-and-fill method is worked by the way of tunnel tunneling so that the demolition efficiency can influence the productivity directly. These years, Long Shou mine always uses the way of tenters the ruler, the multi-circulation demolition pattern lowly.The demolition efficiency is always below 80%.In rich ore,admission passage average for the quantity of mineral deposits are 45-70 tons. In lean ore, admission passage average for the quantity of mineral deposits are 60-80 tons.The present paper take enhances under Long Shou mine to the hexagon admission passage type mining demolition efficiency as the object of study, the pits demolition present situation has carried on the investigation to Long Shou mine, useing the ore-bearing rocks the mechanical properties target, the ore-bearing rocks crevasse target and the ore-bearing rocks demolition qualitative index took the main graduation basis the ore-bearing rocks body which carries on the demolition graduation to Long Shou mine,.The results obtains Long Shou mine's middle and the West pits to pick in the area ore-bearing rocks body the poor rock and the gneiss demolition is best, slanting silique amphibolite, marble and lherzolite demolition next best, but the high-grade ore and the granite demolition is worst. According to the ore-bearing rocks body demolition graduation, unifies the big cross section tunnel tunneling experience to determine the large diameter air gate barrel shape cutting way. According to the medicine hole demolition stave area radius formula, obtains the lean ore stave area radius 206～250 millimeters, the high-grade ore is 152～175 millimeters, it had determined selects the diamond cutting cloth hole method in lean ore that, selects the triangle cutting cloth hole method in the high-grade ore; According to the medicine hole demolition stave area radius formula, obtains the lean ore stave area radius 206～250 millimeters, the high-grade ore is 152～175 millimeters, had determined selects the diamond cutting cloth hole method in lean ore that, selects the triangle cutting cloth hole method in the high-grade ore. According to crag in trough cavity movement model and trough cavity spatial rate and time quota relations, through the computation, had determined in Long Shou mine in the hexagon admission passage demolition, uses the HS non-electric elemental error detonator, the price is low also can obtain the good effect. Had determined according to the break theory of mechanics the hexagon admission passage comes down the hole and peripheral Kong Bukong the parameter, discounts the law with 1/3 rock mass intensity for the high-grade ore body are 71.72～64.1 centimeters, the lean ore is 99.24～85.10 centimeters. Discounts the law high-grade ore body with 1/2 intensity are 60.92～57.46 centimeters, the lean ore are 71.06～66.75 centimeters. And carried on the entire cross section disposable to explode the rags hole design and the industry experiment.The industry experiment result shows us that in explodes under the condition which the prescription consumes does not increase, enters the travel permit artillery in the lean ore to collapse the quantity of mineral deposits to increase from 60～80 tons to average Shan Baobeng the quantity of mineral deposits 120 tons, demolishes the ruler to enhance from the original 1.0～1.4 meters to the average 2.17 meters. Admission passage average is the quantity of mineral deposits increases in high-grade ore rich ore from 45～70 tons to 117 tons, demolishes the ruler to enhance from the original 0.7-1.2 meter to the average 1.87 meters, the Hexagon admission passage type drift-and-fill mining method efficiency achieves above 90%. The demolition efficiency enhanced near two times.Compared Long Shou mine the original admission passage demolition pattern (low scale,multi-circulation) has the obvious superiority, the experiment has obtained the success, and obtained the comprehensive promotion in Long Shou mine.