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

  • Design of controlled blasting (pre-splitting) in Golegohar

    The shortcoming of conventional smooth blasting in damaging inevitably to remaining rock is pointed out, and it is presented that the application of the directional-split blasting technique

  • FHWA Center for Local Aid Support Publications

    Cushion blasting, sometimes referred to as trim blasting, uses a row of lightly loaded "buffer" holes filled with crushed stone over the entire depth of the hole, which reduce the impact on the blasting holes and protect the surrounding rock mass from the shock caused by the blast, thus minimizing the stress and fractures in the finished slope

  • Blast Dynamics, Inc. Course Schedule

    Date: Course: Location: May 11-13, 2020: Efficient Blasting Techniques: Reno, NV USA: May 14 & 15, 2020: Effective Wall Control Techniques: Reno, NV USA

  • PROCEDURES FOR BLASTING

    PROCEDURES FOR BLASTING GEOTECHNICAL ENGINEERING MANUAL GEM-22 Revision #4 AUGUST 2015 . in blasting safety and blasting techniques, and are available to provide assistance during all Presplit blasting is required on State ROW when the design rock slope is one vertical on one

  • FHWA Center for Local Aid Support Publications

    It's similar to downhole drilling, but creates holes that gradually increase or decrease in depth to allow for a stepped slope "break" line shown earlier in Figure 14. (This method is technically not part of a controlled blasting operation because it relies on backbreak to form the slope face.)

  • Copy of Rock Blasting Fundamentals PDHonline

    PDHonline Rock Blasting Fundamentals Slide No. 3 Introduction zThe rock must fracture enough to displace it and break it down to the size of the intended use. zRock Blasting consists of drilling holes in a rock mass at depths, in diameters, and at spacing so that an

  • A Geomechanical Classification for Slopes: Slope Mass

    Normally 22 mm. 120 to 150 kN. They are very appropriate to support slopes with wedges, planes and/or minor topples. A Geomechanical Classification for Slopes: Slope Mass Rating 595 From the point of view of bolting, rock masses can be classified according to the joint frequency in the following types of rock.

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  • 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

  • Comparison of Presplit and Smooth Blasting Methods for

    To understand differences of smooth and presplit blasting for the excavation of rock wells, two field experiments using these two techniques are implemented at the same test site, respectively. The ground vibrations induced by them have been monitored with the different distances through the corresponding devices. The vibration results illustrate that at the same monitoring distance

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  • A REVIEW OF THE DESIGN CRITERIA AND PRACTICAL

    Blasting of weak, highly fissured ground requires a more conservative design than blasting in tough massive rock. Blasthole patterns and charge loads will therefore change appreciably with the rock properties encountered. Perimeter blasting techniques are therefore more costly than re-designed production blasting because

  • Blasting hard rock in Olinda YouTube

    Oct 11, 2017· Blasting retaining wall footings in hard rock in Tecoma Duration: 2:26. Demolition Dave Drilling and Blasting 6,776 views. 2:26. Blasting a large Granite rock on a home site at Mt. Eliza

  • Author: Demolition Dave Drilling and Blasting
  • 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.

  • Blasting damage in rock Rocscience Inc.

    Blasting damage in rock Introduction a slope is already very close to the point of failure, and the blast is simply the last straw to introduce pre-splitting or smooth blasting techniques. These blasting methods, which involve the simultaneous detonation of a row of closely spaced, lightly charged holes,

  • CONTROLLED BLASTING TECHNIQUES

    A technique used (rarely in surface and mostly in underground blasting) in which a row or closely spaced drill holes are loaded with decoupled charges (charges with a smaller diameter that drill hole) and fired simultaneously to produce an excavation contour without fracturing or damaging the rock behind or adjacent to blasted face.

  • (PDF) Investigating Slope Failure and Rockfall Controls at

    T here are several blasting techniques that can be used to control and maintain the integrity o f the slope surfaces. These may incl ude the following; buffer blasting, trim

  • RESEARCH ARTICLES Blasting technique for stabilizing

    (FoS). In this article, a novel direction-controlled blasting technique for removing an unstable slope at Talegaon II of KR is discussed. The stated technique has been implemented on 101 unstable slopes without disturbing the routine train traffic. Study area Talegaon II cutting was excavated in 1994–95 and is one of the 564 cuttings along KR.

  • Controlling the Adverse Effects of Blasting

    Controlling the Adverse Effects of Blasting This module addresses the control of offsite impacts that result from blasting, namely: • vibrations, • airblast, and • flyrock. Much of the information in the module is derived from the Surface Mining Control and Reclamation Act of 1977 (SMCRA). The performance standards apply to all

  • 3 Types of Soil Stabilization Techniques by an Expert GRT

    Apr 04, 2014· 3 Types of Soil Stabilization Techniques by Proven Experts. Different types of soil stabilization have been performed for thousands of years; it wasn’t too long after roads were developed that primitive engineers began looking for ways to improve them. Believe it or not, some of the original methods (or at least their spiritual

  • Rock Slopes MnDOT

    Rock Slopes The Geotechnical Section provides rock slope recommendations for new and existing In hard rock types, controlled blasting techniques are required for final shaping of the cut face. The standard ditch width should be 12 feet, with a depth of 4 feet. Using a standard inslope of 1V:6H or 1V:4H, the resultant

  • Avalanche control Wikipedia

    Avalanche control techniques either directly intervene in the evolution of the snow pack, or lessen the effect of an avalanche once it has occurred. Avalanche blasting in the French ski resort of Tignes (3,600 m) The first technique of ski stabilizing is a method of entering a slope called ski cutting. In this method a skier attempts to

  • ITEM 208 ROCK BLASTING

    Controlled blasting techniques include presplitting, cushion (trim) blasting, and sliver cut blasting. If the designed cut slope is steeper than 1:1 and deeper than 5 feet (1.5 m), use controlled blasting techniques, even if the main excavation is ripped or excavated.

  • 20032990 Centers for Disease Control and Prevention

    Pre-split blasting is a primary technique for creating slopes with a minimum amount of unwanted damage to the remaining rock mass. Rock slopes created in such a way have both safety-related and economic advantages. The applications extend from

  • CHAPTER 5 SURFACE AND SLOPE PROTECTIVE MEASURES

    Structural-mechanical stabilization techniques are called for in cases where the potential for deep-seated slope movement or high, lateral earth stresses exists. A simplified flow chart is shown in Figure 94 which indicates the appropriate combination of methods to either maintain or achieve a stable and erosion-free slope.

  • Avalanche control Wikipedia

    Avalanche control techniques either directly intervene in the evolution of the snow pack, or lessen the effect of an avalanche once it has occurred. Avalanche blasting in the French ski resort of Tignes (3,600 m) The first technique of ski stabilizing is a method of entering a slope called ski cutting. In this method a skier attempts to

  • ITEM 208 ROCK BLASTING

    Controlled blasting techniques include presplitting, cushion (trim) blasting, and sliver cut blasting. If the designed cut slope is steeper than 1:1 and deeper than 5 feet (1.5 m), use controlled blasting techniques, even if the main excavation is ripped or excavated.

  • 20032990 Centers for Disease Control and Prevention

    Pre-split blasting is a primary technique for creating slopes with a minimum amount of unwanted damage to the remaining rock mass. Rock slopes created in such a way have both safety-related and economic advantages. The applications extend from road cuts to rock quarries to large open pit mines.

  • CHAPTER 5 ROCK SLOPE STABILIZATION

    Trimming typically uses cushion or smooth blasting techniques, as described earlier. After the rock section is blasted, the area should be hand scaled to remove smaller material. As with all blasting procedures, trimming can produce flyrock and loud air-blast. CHAPTER 5 ROCK SLOPE STABILIZATION .

  • CHAPTER 5 SURFACE AND SLOPE PROTECTIVE MEASURES

    Structural-mechanical stabilization techniques are called for in cases where the potential for deep-seated slope movement or high, lateral earth stresses exists. A simplified flow chart is shown in Figure 94 which indicates the appropriate combination of methods to either maintain or achieve a stable and erosion-free slope.

  • High angle rock scaling, tunneling services

    Certain slopes may be stabilized through scaling alone, while others may require more extensive stabilization measures such as rock bolting, slope mesh, trim blasting, or shot crete. Our use of rope access techniques as well as certified rope access technicians is how we increase safety.

  • Underground mining (hard rock) Wikipedia

    Underground hard rock mining refers to various underground mining techniques used to excavate hard minerals, usually those containing metals such as ore containing gold, silver, iron, copper, zinc, nickel, tin and lead, but also involves using the same techniques for excavating ores of gems such as diamonds or rubies. Soft rock mining refers to excavation of softer minerals such as salt, coal

  • Tunnels and underground excavations Tunneling techniques

    Tunnels and underground excavations Tunnels and underground excavations Tunneling techniques: Tunnels are generally grouped in four broad categories, depending on the material through which they pass: soft ground, consisting of soil and very weak rock; hard rock; soft rock, such as shale, chalk, and friable sandstone; and subaqueous. While these four broad types of ground condition require

  • FOUNDATION PREPARATION, TREATMENT, AND CLEANUP

    FOUNDATION PREPARATION, TREATMENT, AND CLEANUP in slope, and excessively steep surfaces. Embankment zones may differentially settle adjacent to these areas, resulting in cracks. Arching occurs near stepped surfaces Controlled blasting techniques, such as line drilling and smooth blasting, should be used.

  • Design of Overall Slope Angle and Analysis of Rock Slope

    also other empirical methods in determination of bench slope and overall steep of the slope in order to promote the obtained results safety factor. Therefore, value of the rocks of each block, one can determine slope steep angle by the empirical methods obtained from Rock Mass Rat- ing (RMR), Mine Rock Mass Rating (MRMR) and Slope . Table 1.

  • Pit Slope Stability Consultants Geotechnical Engineering

    He specializes in open pit slope design and understanding rock mass damage and dilation caused by blasting and unloading in open pit excavations. Anton’s in-depth knowledge of primary data acquisition methods and QA/QC for rock mechanics modeling and excavation design supports his reasoned approach to slope stability back-analysis.

  • Controlled blasting in an open-pit mine for improved slope

    A case study is presented where a controlled blasting programme (presplitting) was adopted in an open-pit copper mine in order to improve the stability of the resulting cut slopes. The aim was to reduce over break and minimize damage to the final pit walls from production blasts. The use of presplitting allowed considerably higher benches to be adopted with much steeper overall slope angles.

  • TheDesignofQuarry FacesandSlopes Agg-Net

    benched quarry slope is illustrated in figure 1. The reserves sterilized/lost increase progressively to 12,744 tonnes for each 10m length of face as the face angle is reduced from 90° to 65°. Bench width The effect of increasing bench width on a three-benched quarry slope with faces at

  • Impact Analysis of Blasting Vibration on the Slope and Dump

    INTRODUCTION. The stability of the dump has a very important meaning on regular production of mine and safety of workers and machine. The stability of slope is also a very important issue in the process of open pit mining while the vibration mining of blasting has some impact on the stability of dump and slope (Xing, 2004; Zheng et al., 2011; Li et al., 2010; Huang et al., 2011).