Drilling and blasting technology of horizontal mining

Contents

Introduction

1. Selection of penetrating equipment

1.1. Determination of hole depth

1.2. Formation of a set of penetrating equipment

1.2.1.Selection of drilling rig

1.2.2. Selection of loading machine

1.2.3. Selection of bottomhole transport

1.2.4. Selection of equipment for installation of support

1.2.5 Formation of equipment sets

2. Drilling and blasting certificate

2.1. Explosive Selection

2.2 Specific consumption of explosive

2.3. Number of holes

2.4. Placement of holes in the face

2.4.1 Type of hole and distance between hole holes

2.4.2 Location of outlining holes and distance between them

2.5. Determination of explosive flow rate

2.6. Calculation of electric explosion network

2.7. Calculation of efficiency of drilling and blasting operations

2.8. Organization of drilling and blasting operations

3. Selection of ventilation equipment for ventilation of production during its construction

3.1. Source Data

3.2. Required amount of air in bottomhole zone of the mine

3.2.1. Required amount of air for gases generated after blasting

3.2.2. Air consumption by the largest number of people working in production

3.2.3. By minimum permissible traffic speed safety rules

3.3. Selection of ventilation means

4. Loading and transportation of rock mass

4.1. Determine the number of cars required

4.2. Determination of the length of the composition of the wagons

4.3. Selection of bottom-hole transport scheme

4.4. Determination of loading time

4.5. Technology of car exchange during rock loading

5. Mining workings attachment

5.2. Permanent fastener

6. Auxiliary works

6.1. Drainage groove arrangement

6.2. Laying of temporary rail track

6.3. Permanent track laying

6.4. Vent Pipe Suspension

6.5. Lighting

7. Construction of a schedule for the organization of rolling operations and determination of technical and economic parameters of the development

7.1. Determination of TRU duration

7.2. Determination of rock harvesting duration

7.3. Determination of duration of workpiece attachment

7.4. Normalized processes

7.4.1. Determination of duration of ventilation pipeline installation

7.4.2. Duration of water drain pipe extension

7.4.3. Duration of temporary rail track installation

7.4.4. Duration of time path removal

7.4.5. Duration of permanent track installation

7.4.6. Duration of groove concreting

7.5. Productivity of workers

7.6. Technical and economic indicators of production

8. Bibliographic list

Task

Theme of the project "Mining technology"

Initial data for the project: mine category non-hazardous in dust and gas, rock strength coefficient 46, rock extraction coefficient 1.0 fasteners: tubing, tubing GTK; cross-sectional area of the working in light is 9.4 m2, the working length is 600 m, the water inflow is "wet," the working speed is 110 m/month .

The contents of the explanatory note: 1) selection of a rational set of penetrating equipment; 2) substantiation of technological and organizational parameters of development; 3) calculation of technical and economic indicators.

List of graphic material: 1) cross section of production in operation; 2) tables: characteristics of production, consumption of materials for 1 m of production, list of penetrating equipment; 3) vertical and horizontal sections "Placement of penetrating equipment"; 4) certificate of drilling and blasting operations; 5) work organization schedule; 6) technical and economic indicators.

Summary

In this course design, the selection and justification of the penetrating complex was made in order to ensure the given speed of mining; calculations of drilling and blasting operations, ventilation, loading of rock mass, fixation of working and preparation of work organization schedule are given.

As a result of the assessment, the optimal set of mining equipment for these conditions was chosen, including: BUE3 drilling rig, 2PNB2 loading machine, VG3.3 wagons, two AP7 electric locomotives.

The average length of the hole is 2.4 m. The movement of the face for the cycle is 2.25 m. The duration of the passing cycle is 8.3 hours. Production speed is 122 m/m.

The course design consists of an explanatory note on 34 sheets and one A1 drawing.

Introduction

Mining is an independent production process aimed at solving three main problems: destruction of rock mass, removal of rock mass outside the mining circuit, ensuring stability of the formed cavity. The process flow chart of the development includes engineering solutions on the technology of the development, placement of penetrating equipment in the development, selection and justification of the technologically possible sequence and duration of work, the number of penetrators of the required qualification, and technical and economic indicators.

Auxiliary works

Auxiliary works include the device of the drain groove, the flooring of the rail track, the laying of switching lines, rigging and delivery works, etc.

6.1. Drainage groove arrangement

Cavity for drainage groove is formed during drilling and blasting operations, including 1 holes in certificate of drilling and blasting operations for formation of cavity for groove. Groove is fixed with cast-in-situ concrete. The groove is attached with a lag of 22 m.

6.2. Laying of temporary rail track

A temporary track is laid each cycle of 2 m. Before laying the rail track, the web must be cleared of irregularities in the soil of the mine. Sleepers h = 140 mm and l = 1700 mm are laid on aligned soil at a distance of 1 m. Then rails P24 are laid on them, fastened with strips and bolts to previously laid rails, and sewn with the help of linings and crutches to sleepers. Rock or crushed stone is selected for stability of laid track under sleepers. Space between sleepers is filled with rock. Track gauge - 900mm.

6.3. Permanent track laying

Track laying begins with the marksman breaking the axis of the track with installation every 1015 m. After leveling, soil of working is planned with its support and filling of potholes with rock. Longitudinal drainage grooves shall be completed before the tracks are laid. Sleepers and rails are laid, ballast is rolled, unloaded and filled. Rails are laid on liners and connected to each other with straps and bolts. Rails are sewn to sleepers with crutches from the side of sleepers ends laid along the cord. Then, second thread of rail track is laid along track template and ballasting is performed with subsequent straightening of track at points of curvature and picking ballast for sleepers.

6.4. Vent Pipe Suspension

Pipes are suspended on suspensions. The suspensions are made of steel wire with a diameter of 35mm and fixed so that they hold the pipes. The ends of the wire are bent so that they do not touch the rubberized tubes during ventilation operation. Then pipes are hung and joints are connected. Gaskets are made and laid, solution is prepared for pipe washing. Pipe joints are washed with clay solution. Lines and all connections are checked.

6.5. Lighting

Use lamps in normal execution to publicizing of developments (RN - 60 - 1, RN - 60 - 2). The permanent lighting network shall not be more than 20 m from the face. Bottom-hole zone is illuminated by lamps installed on mining machines. Workers have individual lamps.

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