Under-ice Mining Techniques

Under-ice Mining Techniques PDF Author: John F. Abel
Publisher:
ISBN:
Category : Ice tunneling
Languages : en
Pages : 86

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Book Description
Methods of excavating in the Greenland Ice Cap, and the planning required, equipment employed, and problems encountered are described individually for each of 5 operating seasons (1955-1959), and relative cost evaluations of the different methods are given. Three basic methods were used: hand-picking and manual haulage; explosives and manual haulage (drill-blast-muck cycle); and mechanized mining and haulage. Manual methods, which are of low capacity and limited to widths under 12 ft, are justified only when small openings are required, and in remote, inaccessible regions. The drill-blast-muck cycle of mining has a slightly higher capacity than manual methods, but requires power to operate the drills and to ventilate after blasting. Explosives can be used for room spans not exceeding 12 ft; when greater spans are excavated by blasting, the resulting roof is unstable. The machine method using mechanized coal mining equipment has the highest capacity and the lowest unit cost. Openings with roof spans in excess of 36 ft have been made with coal mining machines without dangerous roof conditions developing.

Under-ice Mining Techniques

Under-ice Mining Techniques PDF Author: John F. Abel
Publisher:
ISBN:
Category : Ice tunneling
Languages : en
Pages : 86

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Book Description
Methods of excavating in the Greenland Ice Cap, and the planning required, equipment employed, and problems encountered are described individually for each of 5 operating seasons (1955-1959), and relative cost evaluations of the different methods are given. Three basic methods were used: hand-picking and manual haulage; explosives and manual haulage (drill-blast-muck cycle); and mechanized mining and haulage. Manual methods, which are of low capacity and limited to widths under 12 ft, are justified only when small openings are required, and in remote, inaccessible regions. The drill-blast-muck cycle of mining has a slightly higher capacity than manual methods, but requires power to operate the drills and to ventilate after blasting. Explosives can be used for room spans not exceeding 12 ft; when greater spans are excavated by blasting, the resulting roof is unstable. The machine method using mechanized coal mining equipment has the highest capacity and the lowest unit cost. Openings with roof spans in excess of 36 ft have been made with coal mining machines without dangerous roof conditions developing.

Special Report - Corps of Engineers, U.S. Army, Cold Regions Research and Engineering Laboratory

Special Report - Corps of Engineers, U.S. Army, Cold Regions Research and Engineering Laboratory PDF Author: Cold Regions Research and Engineering Laboratory (U.S.)
Publisher:
ISBN:
Category : Arctic regions
Languages : en
Pages : 478

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USA CRREL Technical Publications

USA CRREL Technical Publications PDF Author: Cold Regions Research and Engineering Laboratory (U.S.)
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 386

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General Considerations for Drill System Design

General Considerations for Drill System Design PDF Author: Malcolm Mellor
Publisher:
ISBN:
Category : Boring
Languages : en
Pages : 44

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Book Description
Drilling systems are discussed in general terms, component functions common to all systems are identified, and a simple classification is drawn up in order to outline relations between penetration, material removal, hole wall support, and ground conditions. Energy and power requirements for penetration of ice and frozen ground are analyzed for both mechanical and thermal processes. Power requirements for removal of material and for hoisting of drill strings are considered, and total power requirements for complete systems are assessed. Performance data for drilling systems working in ice and frozen ground are reviewed, and results are analyzed to obtain specific energy values. Specific energy data are assembled for drag-bit cutting, normal impact and indentation, liquid jet attack, and thermal penetration. Torque and axial force capabilities of typical rotary drilling systems are reviewed and analyzed. The overall intent is to provide data and quantitative guidance that can lead to systematic design procedures for drilling systems for cold regions.

CRREL Technical Publications, 1950-1975

CRREL Technical Publications, 1950-1975 PDF Author: Cold Regions Research and Engineering Laboratory (U.S.)
Publisher:
ISBN:
Category : Arctic regions
Languages : en
Pages : 284

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SIPRE Report

SIPRE Report PDF Author:
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 230

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Government-wide Index to Federal Research & Development Reports

Government-wide Index to Federal Research & Development Reports PDF Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 1470

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Research Report - Corps of Engineers, U.S. Army, Cold Regions Research and Engineering Laboratory

Research Report - Corps of Engineers, U.S. Army, Cold Regions Research and Engineering Laboratory PDF Author: Cold Regions Research and Engineering Laboratory (U.S.)
Publisher:
ISBN:
Category : Frozen ground
Languages : en
Pages : 32

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Research Report

Research Report PDF Author:
Publisher:
ISBN:
Category : Cold regions
Languages : en
Pages : 350

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Fundamental Concepts for the Rapid Disengagement of Frozen Soil

Fundamental Concepts for the Rapid Disengagement of Frozen Soil PDF Author: Foster-Miller Associates
Publisher:
ISBN:
Category : Excavation
Languages : en
Pages : 122

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Book Description