The application of "line drilling" and "buffer holes" methods to reduce blasting vibration. ... Currently, blasting activities at PT Putra Perkasa Abadi Jobsite Borneo Indobara are carried out within 500 m of the active slope, so that the blasting distance is optimized. In optimizing the blasting distance, it is necessary to maintain …

The utilization of activity time consists of 55.3% active time, 23% idle time, and 22% buffer time. The obtained values are superior when compared to the time utilization of the conventional method. Download conference paper PDF ... Although the application of the Double Blasting method can speed up the mining process so that …

The design utilizes current methods of perimeter blasting with the added design element of a buffer row coordinated with the perimeter row to reduce perimeter damage. The coordination is in applying one of several blast damage models to calculate the damage extent for each buffer and perimeter blast hole in the design.

This method may not be practical for an operation to use frequently and would likely be used more academically. However, it is an option. ... Buffer blasting is a term I used for a similar scenario as …

The smooth blasting is also referred to as contour blasting or perimeter blasting. 4. Cushion Blasting. Cushion blasting is like smooth wall blasting, a single row of holes is drilled along the excavation line, …

A method of smooth wall rock blasting is provided in which an alignment of boreholes for explosive charging is drilled into rock and a single, smaller diameter empty borehole is drilled close and parallel to, and on each side of each charged borehole. ... This technique is known as buffer blasting. Of the above techniques, only pre-shearing ...

In this method, a buffer row is placed in front of the pre-split to achieve better back-break control. Buffer holes are a row of lightly loaded blast holes in between the production and pre-split holes and are intended to …

Buffer blasting is one of the wall co ntrol blasting technique that will be discussed on how it is used. to control spontan eous combustion in surface coal mines. This r eport focus mainl y on ...

Classification according to blasting methods: shallow hole blasting, deep hole blasting, chamber blasting, multi-row hole differential blasting, multi-row hole differential extrusion blasting, springing blasting, external application …

When the buffer blasting methods for muck rock mass and trim blasting of the ore-rock j unction . are used, the method of the rock blast preparation for sel ective excavation can be applied in the ...

Pre-Splitting is a method of blasting in which a planner crack is propagated by blasting to determine the final shap e of the rock fa ce before holes are drilled for the final blast pattern

If you decide to use the soda blasting method, be sure to wear a respirator and take appropriate safety precautions to avoid any overspray coming into contact with plants, as the high pH level of the material can be harmful. ... Use an electric buffer. Using an electric buffer is an effective way to remove paint stains from your garage floor ...

is felt that the methods developed on this project could have useful applications on other major construction projects. ... These techniques include buffer blasting [16]. Buffer blasting holes are ...

As Hu et al. states, damage is caused by the final face blasting, whichever method is chosen, and then the accumulation of damage from all other blasts. ... Damage from buffer blasting had the least effect on overall damage. Figure 6.3: Damage Process for Each Step of Excavation in Smooth Blasting. Hu et al. (2013)

According to the parameter theory of conventional blasting, this paper summarizes theoretical analysis of buffer blasting about the aperture, the horizontal …

WCBT includes buffer blasting, trim blasting, line blasting and pre-splitting. Among these, the pre-splitting is the most commonly used technique. This technique has several advantages such as minimum …

The invention discloses a strip mine high-step large-aperture buffer blasting method, which is characterized in that on a high step close to a mining boundary, by a blasting technology of arranging buffer holes in the last row and filling powder in the holes at intervals, the effective utilization rate of the depth of blast holes can be improved, the …

The invention discloses a segmented step type presplitting blasting method of an open pit mine, which comprises the following steps of: dividing an open pit mine to be blasted into a plurality of sections of step-type areas from top to bottom for blasting, wherein each section of step-type area comprises a step slope and a platform area; drilling a row of pre …

A third uncommon controlled blasting method is buffer blasting. This technique involves lightly loading the last row of production holes to reduce the amount of damage they will cause to the adjacent rock mass [4]. Buffer blasting is most often used …

Roughened slopes can be produced using “cushion†(buffer) blasting, horizontal hole blasting, or, for flatter slopes, step drilling. ... The chief difference between various methods of controlled blasting is the burden at the time the controlled holes are fired. Smooth Blasting.

Expanded rock blast modeling capabilities of DMC{_}BLAST, including buffer blasting. ... The pit can also now be defined using coordinates based on the toe of the bench. A method for modeling decked explosives has been developed which allows accurate treatment of the inert materials (stemming) in the explosive column and …

Bench blasting: A method of blasting in quarries and opencast sites by means of steps or benches with holes positioned parallel to the bench face. ... Buffer blasting: The practice of firing a second shot before completely excavating the previous shot. This is usually an attempt to reduce flyrock.

For data collection and monitoring, two rows of smaller, lighter packed buffer blast holes and then the rows of production blasting were used. Monitoring equipment …

A more pro-active method of designing buffer blast blocks. At times the rate of mining is such that buffer blasts are not designed in time Improved and quicker identification of areas requiring buffer blasting – planning TARP implementation. To pre-identify Code Red zones (where buffer blasting is most likely to be required)

This method is used extensively for roadway rock cuts, lock walls, and any other cuts to produce a solid wall with little or no backbreak is needed. It is used to reduce the …

Explosives are probably the most cost-effective method of rock excavation in underground mining operations 1,2,3.Tunnel and underground rock excavation have largely relied on drilling and blasting ...

These include line drilling, smooth wall blasting, trim blasting, buffer blasting, air decking, and presplitting. Each of these techniques have associated advantages and disadvantages.

When the buffer blasting methods for muck rock mass and trim blasting of the ore-rock junction are used, the method of the rock blast preparation for selective excavation can be applied in the open development. The open developments are steeply dipping deposits for the mining conditions and avaluable deposits with complex-structural ...

PURPOSE: A shock-absorbing rock blasting method is provided to reduce the blasting pressure applied to a bore hole by filling the gap between an explosive and a bore hole wall. CONSTITUTION: A shock-absorbing rock blasting method comprises the steps of: punching a bore hole(S10), inserting a guide pipe in the bore hole(S20), inserting an …

In order to ensure the crushing effect of buffer blasthole, the row spacing between the buffer blasthole and presplitting blasthole should choose the data of the …