DRILLING ÄND BLASTING OF ROCKS CARLOS LOPEZ JIMENO Project Director for EPM, SA EMLIO LOPEZ JIMENO FRANCISCO JAVIER. Submitted By. drilling blasting rocks filetype pdf free Engineer requires continuous use of drilling and blasting or special power. Facts About: Underwater Drilling. faced with a number of challenges in the area of drilling and blasting such as blasting cost, explosives consumption, airblast, blast induced ground vibration and flyrocks. Sorry, there is no online preview for this file type.

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Basic structureof the cost optimization model. Strain Energy Factor and Blastability factor. It is not recornmended that the holes be longer than 1. The algorithm used to calculate the number of radial cracks around each charge and at a determined distance from these is that of Harries Normally, this type of blast is blastin fall in one direction.

Calder Reed Mining Tools, Inc.: In relation with the height of the chambers, these are classified as follows: Their sizing is one of the most important aspects because it conditions the ore recovery and the stability of the operation. The number of rows should never be less than 2 and should be increased if the wall is to collapse. In the following, the powder dfilling refer to gelatin explosives with a density in cartridge of 1. Now it has become a technique based on scientific principles derived from knowledge of the action of explosives, the mechanisms of breakage and the geomechanic properties of the rock masses.

As to porosity, those rocks that have low density and, consequently, are more porous, have low crushing strength and are easier to drill.

For the first, the demolition will be carried out by making cuts with confined explosive charges at strategic points of the structure, as indicated in Fig. Basic actions in rotary percussive drilling. The unit can be installed on a jeep-type vehicle or on the back of an ANFO charge truck. ANFO loader roccks vehicle.

Drilling and Blasting of Rocks – CRC Press Book

Use of inclined blastholes. In rockks pushing movement an expansion element presses against the walls of the blasthole, retaining the climber in place while the piston rod forces the cartridge upwards which is held in place by a spider-like piece.


The air confined in the back end of the cylinder 3 starts to expand and contiunes to drive the piston forward. The advantages of this System are its simplicity and low cost. Besides, it has the advantage of using less quantity of. When the gelling ocurrs too rapidly, purnping difficulties appear, whereas if the gelling time is too long the s1un-y can become diluted or even dissolved before its viscosity permits it to resist the effect of the water fjletype in the blastholes.

The rotary air-lock feeder is composed of foletype drum wheel with plastic blades which also keeps the pressured air out of the ANFO bin. In these cases it is recomrnended that the downline be prepared for multiple prirning outside the hole, threading twice each of the pnmers, Foletype. These devices have two inches of flexible hose with a rigid tube on one end, upon which an inflatable rubber bladder is mounted and inflated by pressurized air, Fig.

The maximum charging capacity oscillates between 2 and 4 tons.

Note that the piston flange 4 closes the exhaust port 6 and that the front end is still at atmospheric glasting. When massive rocks are broken, almost all of the specific area of the material blastibg created by the blast, and the explosives used should be of maximum strength and detonation velocity VD which produce high blasthole pressure.

An important new mining method. The backedge of the piston flange uncovers the exhaust port. These units can blating blastholes in a few seconds,Fig.

The wave travels at high speed and its shape depends basically on the design of the piston. Transversal section of a wall and the geometry of the charges. The charging of upholes with blasting agents such a slumes and drilliny is even more difficult than with ANFO, as it is first necessary to apply a borehole plug to keep the explosive from falling out and, secondly, the product must have an adequate consistency for pumping. During operation, blasting mats may be used to contain the blast, suppress dust and noise, for fly rock prevention and sometimes to direct the blast.


There are very few similar works in other languages, and certainly none other in Spanish. Afterwards, a sensitivity analysis is carried out in order to calculate theoretically the optimum fragmentation, evaluating the System in practice by contrastingthe actual size distribution and yields with those predicted in the filethpe, Fig.

It is used in small operations where, due to the size, other machinery cannot be used or its cost is not justified.

While drilling and blasting saw limited use in pre-industrial times using gunpowder such as with the Blue Ridge Tunnel in the United States, built in the sit was not until more powerful and safer explosivessuch as dynamite patentedas well as powered drjlling were developed, that its potential was fully realised.

To calH culate L the following equation is used: Higher velocity explosives are used for relatively hard rock in order to shatter and break the rock, while low velocity explosives are used in soft rocks to generate more gas pressure and a greater heaving effect.

In the first instance, the elements to be blasted form a wedge, Fig. Static plant and pump tmck Nitro Nobel.

Drilling and Blasting of Rocks

Knowing C, and C2, C3 is calculated as 1. Structure und building demolitionThe following gives an idea of the most frequent types of demolition.

The quantity of ore extracted can be as large four meters vertically, because the total height of the excavation would be excessive and the blastholq are placed with a 50 to 65′ inclination.

The propagation velocity of the cracks is from 0. The elastic properties of rocks are charactenzed by the elasticity module ‘E’ and the Poisson coefficient ‘ V ‘. The flow rates are comparable to those obtained with’ ANFO pneumatic chargers.