کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
809109 1468699 2014 12 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Controlled blasting for long term stability of pit-walls
ترجمه فارسی عنوان
کنترل انفجار برای ثبات دراز مدت دیوارهای چاله
کلمات کلیدی
انفجار کنترل شده، قبل از تقسیم، کنترل دیوار، انفجار مجدد گودال، ثبات دیوار حصیری، کنترل لرزش
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
چکیده انگلیسی


• Pre-split blasting was implemented in all the benches to assure wall control.
• Borehole detonation pressure was measured to ensure the success of pre-split blast.
• To achieve desired outcome more than thousands pre-split blasts were conducted.
• Experiments include various changes in vertical and inclined pre-split holes.
• Pre-split helped in maintaining high-wall stability for access roads, ramps etc.

Controlled blasting techniques were used to control over-breaks and to aid in the stability of the remaining rock mass at Rampura Agucha open-pit mine in India. The mine is a lead zinc mine producing 5.95 mtpa of ore and has recently started its underground part, which is slated to produce 4.5 mtpa of ore in near future. The mine is currently working at 260 m depth, and is designed to reach a depth of 372 m. During blasting, back break was the main concern as despite of carrying out pre-splitting; the benches experienced back breaks adversely affecting the stability of the remaining walls. Normal production blast consists of detonation of 6–8 rows involving 140–200 holes in a blast round. A master plan of the pre-split holes position at spacing of 1.2 m was prepared. The available explosive was in the cartridge diameter of 25 mm which provided decoupling ratio of 1:3.6. Each bench of footwall and of all stages of hang wall is pre-splitted to minimize damage to the rock mass. Pre-split holes of about 700,000 m are being drilled annually to get desired pit slopes. In the experimental trials the mouths of the pre-split holes were left without explosives from 0.8 to 2.7 m. In the latter stage the inclined holes of 115 mm at 80°, 70° and 60° were experimented. The pre-split holes drilled at 1.2 m spacing with 60° inclination on footwall and 70° on hangwall yielded desired results.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Rock Mechanics and Mining Sciences - Volume 70, September 2014, Pages 388–399
نویسندگان
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