slope blasting technique

slope blasting technique

Chapter 11 SPECIALIZED BLASTING TECHNIQUES

AVALANCHE BLASTING Slope testing, avalanche release, and snow stabilization are the main objectives for using explosives in avalanche blasting. To achieve these objectives, a standard charge is used that is capable of developing deto-nation pressure equal to 1 kg of TNT. Chapter 11 SPECIALIZED BLASTING TECHNIQUES

PROCEDURES FOR BLASTING

in blasting safety and blasting techniques, and are available to provide assistance during all phases of the blasting operations. ... Presplit blasting is required on State ROW when the design rock slope is one vertical on one horizontal or steeper and the vertical height of the exposed rock slope

Innovative Directional Controlled Blasting Technique for ...

Apr 06, 2020 · 高达10%返现 · The directional blasting is a technique in which the blasted material is cast directly into the desired area leaving minimum muck to be handled mechanically. The technique for the last 3 to 4 decades has been applied in surface mines and other rock excavation projects.

Improved Blasting and Bench Slope Design at the Aitik Mine

An extensive project on smooth blasting was conducted in the period of 1991 to 1996. The project was divided into four phases (1 through 4). The overall objective of the work was to develop smooth blasting techniques (for final pit walls) to improve bench slope geometry

Understanding the connection between blasting and highwall ...

Jan 01, 2019 · When slope stability becomes an issue, a controlled blasting technique must be used to improve stability. There are a number of controlled blasting techniques that are used in the mining, construction, and tunneling industries. The most commonly used of these techniques is presplitting.

FINAL WALL STABILITY IN METAL OPEN PIT MINES USING ...

Several techniques can be used to improve wall stability in open pit mines, such as changing the mining sequence rate or mining methods, dewatering methods, mechanical supports for rock reinforcement including anchors, rock bolts, wire mesh and controlled blasting. Among the methods stated, controlled

(PDF) 05 chapter 3 rock excavation methods | Sohail Tarar ...

Figure 12 shows an example of a cut slope that used presplit basting methods which left visible half casts in the slope face. Presplit blasting requires relatively small drill holes, between 5 to 10 cm (2 to 4 in) in diameter because its goal is to create discrete fractures, not massive breaking.

(PDF) Special Blasting Techniques - ResearchGate

This chapter briefly introduces a few blasting techniques. These include demolition blasting, reinforcement of soft ground, shaped charges, well stimulation, explosion welding, and stump blasting.

Techniques of Controlled Blasting - SlideShare

Dec 17, 2009 · Following are the techniques of controlled blasting: Line drilling, Trim (Cushion) blasting, Smooth (contour or perimeter) blasting, Pre-splitting, Selecting and employing various parameters of blast design, using modern technology, Precise and accurate timing delays, Muffle blasting at critical and congested areas. 4 5.

Comparison of Presplit and Smooth Blasting Methods for ...

Hu et al. investigated the blast-induced rock damage process with presplit and smooth blasting techniques during the excavation of high rock slope. The results demonstrated that when smooth blasting was applied, the damage zones were induced by the explosives of all boreholes, but when presplit blasting

Improved Blasting and Bench Slope Design at the Aitik Mine

An extensive project on smooth blasting was conducted in the period of 1991 to 1996. The project was divided into four phases (1 through 4). The overall objective of the work was to develop smooth blasting techniques (for final pit walls) to improve bench slope geometry

Understanding the connection between blasting and highwall ...

Jan 01, 2019 · When slope stability becomes an issue, a controlled blasting technique must be used to improve stability. There are a number of controlled blasting techniques that are used in the mining, construction, and tunneling industries. The most commonly used of these techniques is presplitting.

(PDF) Rock Slope Stability Assessment by using Kinematic ...

Blasting : A Case Study, BSc Thesis, Universiti Teknologi Mala ysia, ... It describes the basic rock slope failure modes and methods of analysis--both kinematic and kinetic techniques. Chapters ...

(PDF) Special Blasting Techniques - ResearchGate

This chapter briefly introduces a few blasting techniques. These include demolition blasting, reinforcement of soft ground, shaped charges, well stimulation, explosion welding, and stump blasting.

CHAPTER 15

Bureau’s Procedures for Blasting (GEM-22), serves as the basis for all regulations and recommended practices regarding blasting for rock cut excavation. The purpose of the rock slope design process is to design and construct rock cuts that will be stable and provide long-term safety for the public. The inclination of rock slopes should be based

A Geomechanical Classification for Slopes: Slope Mass ...

Jan 01, 1993 · Table 3 Adjustment Rating for Methods of Excavation of Slopes Method Natural slope +15 Presplitting +10 Smooth blasting +8 Blasting or mechanical Deficient blasting o -8 580 Rock Mass Classification (v) Deficient blasting, often with too much explosive, no detonation timing and/or nonparallel holes, damages stability: F4 = - 8.

Blasting excavation and stability control technology for ...

Blasting is the major way for rock excavation on large projects, especially for ultra-high steep rock slope. Due to the constraints of topography and geomorphology, requirements on blasting excavation and stability of the reserved rock after blasting are strict for ultra-high steep rock slope. Thus, blasting and reinforcement technology have caused

Summary of Surface Blasting and Damages with Analysis of ...

Mar 24, 2015 · While presplit blasting was beneficial, to improve stability of the final face requires proper design of all the blasts, especially those directly in front of the presplit face. Comparison of Blast-Induced Damage between Presplit and Smooth Blasting of High Rock Slope by Hu et al. (2013)

Rock Slopes - MnDOT

high bluffs where it would be impractical to cut it to a soil slope. In this case it is often desirable to cut the sandstone to a steep slope, such as 4V:1H, and direct runoff away from the face to the extent possible. In hard rock types, controlled blasting techniques are required for final shaping of the cut face.

Use of Rock Scaling in Rockfall Mitigation and Slope ...

Many techniques came forward to intensify the rockfall mitigation process. One of them is the use of Rock Scaling in Rockfall Mitigation and Slope Stabilization. Rock Scaling is the process of removal of loose rocks, from a lofty slope to eradicate the risk of rockfall. The process of

Impact Analysis of Blasting Vibration on the Slope and Dump

Impact Analysis of Blasting Vibration on the Slope and Dump. Zhang De , Li Gang Yan and Xu Yuan. ABSTRACT. As known that the blasting on the slope is very dangerous in the exploration of the mine andneeds complex analysis and calculation on the slope and dump. In the study it adopts the regression method in the analysis of important parameters ...

Prediction of Bench Blasting Vibration on Slope and Safety ...

The reconstruction and expansion project of oil reserve base often faces the excavation and blasting of the slope and undercrossing tunnel at the same time. Due to the flammable and explosive liquid storage nearby, the tight construction period, and the high requirements of collaborative construction, once the blasting accident occurs, the consequences are unimaginable.

(PDF) CHAPTER 5 – ROCK SLOPE STABILIZATION | Nam

SLOPE GEOMETRY ALTERATION These methods change the configuration of a slope by removing rock and/or soil. Scaling Scaling is the process of removing loose or potentially unstable material (or a small section of slope) that might dislodge or affect the trajectory of falling rock by creating a launching point for materials falling from above.

(PDF) CHAPTER 5 – ROCK SLOPE STABILIZATION | Nam

SLOPE GEOMETRY ALTERATION These methods change the configuration of a slope by removing rock and/or soil. Scaling Scaling is the process of removing loose or potentially unstable material (or a small section of slope) that might dislodge or affect the trajectory of falling rock by creating a launching point for materials falling from above.

CHAPTER 5 SURFACE AND SLOPE PROTECTIVE MEASURES

Selection criteria for slope stabilization methods. 5.2.1 Site Analysis. In order to ensure success of any revegetation effort, it is necessary to prepare an overall plan which considers the climate, vegetation, and microsite (soils, microclimate, slope, and aspect). ... Blasting is sometimes used to disrupt failure surfaces and to improve ...

Highway Slope Manual - CEDD

7.1 Common Methods for Optimisation and Control of Blasting 65 7.2 Processes to Address Safety Concerns Arising from Rock Breaking above and adjacent to Roads at Various Stages of a Project 67 7.3 Examples of Requirements for Protective Barriers and Slope

Rock Slopes - MnDOT

high bluffs where it would be impractical to cut it to a soil slope. In this case it is often desirable to cut the sandstone to a steep slope, such as 4V:1H, and direct runoff away from the face to the extent possible. In hard rock types, controlled blasting techniques are required for final shaping of the cut face.

Managing Highway Rock Slope Scaling

blocks from a slope face.” Removal typically is done by hand using pry bars or with mechanical assistance such as jacks, hydraulic splitters, air pillows, or heavy machinery (e.g., excavators, backhoes, cranes dragging heavy objects on the slope). In some cases, trim blasting techniques are considered part of a scaling program.

Impact Analysis of Blasting Vibration on the Slope and Dump

Impact Analysis of Blasting Vibration on the Slope and Dump. Zhang De , Li Gang Yan and Xu Yuan. ABSTRACT. As known that the blasting on the slope is very dangerous in the exploration of the mine andneeds complex analysis and calculation on the slope and dump. In the study it adopts the regression method in the analysis of important parameters ...

A A A - Oregon

should be the steepest continuous slope (without benches) that satisfies physical and stability considerations. Controlled blasting (using presplit and trim blasting techniques) is normally required for rock cut slopes from vertical to 0.75:1. The purpose of controlled blasting is to minimize blast damage to

Paper: Improved Blasting and Bench Slope Design at the ...

This work pointed at the possibility of increasing interramp slope angles a few degrees, which, in turn, requires an improved bench slope design, most notably blasting techniques. Building upon previous development work, new field trials were conducted in conjunction with trimming of the footwall slope to increase ore extraction.

A Novel Method to Evaluate the Effect of Slope Blasting ...

The bench cast blasting effect includes many aspects, and it is difficult to take every factor into consideration. Considering the comprehensive evaluation index system of the step-blasting effect in previous research [16, 17, 25], 11 factors are selected as the evaluation indicators in this paper.Then, based on the results of 16 effective blasting operations conducted in [] and others from ...

Blasting technique for stabilizing accidentprone slope for ...

Blasting technique for stabilizing accidentprone slope for ...

How to Carry out Controlled Blasting of Rocks? [PDF] - The ...

🕑 Reading time: 1 minute The main objectives of controlled blasting techniques are to minimize the overbreak and fracturing of rock beyond the designated boundary of excavation to achieve smooth post-blast surface and to control wild flyrock and ground vibration within permissible limits. This objective is normally achieved by minimizing and making judicious use of []

WALL CONTROL BLASTING TECHNIQUES by Partha D Sharma -

Feb 25, 2011 · Production Blasting- To improve slope stability and avoid overbreak or backbreak (rock volume broken beyond the plane defined by the last row of blast holes) during production blasting, the ...

Utility/Trench Blasting | McCallum Rock Drilling

Pre-splitting is a protective blasting technique we use to promote slope stability. This method creates cracks hole to hole for a final desired back wall or contour by firing a single row of holes prior to the initiation of the rest of the blast pattern.

Prediction of Bench Blasting Vibration on Slope and Safety ...

The reconstruction and expansion project of oil reserve base often faces the excavation and blasting of the slope and undercrossing tunnel at the same time. Due to the flammable and explosive liquid storage nearby, the tight construction period, and the high requirements of collaborative construction, once the blasting accident occurs, the consequences are unimaginable.