drilling rock Articles
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The mechanism and law of wellbore instability due to drill string impact in air drilling
Due to the low density and small damping factor of gas, drill string vibration in air drilling is much more violent than that in mud. Drill string impact on wellbore wall has a vital effect on wellbore stability in many cases. However, there are few researches about drill string impact on wellbore wall so far. In this paper, the calculation model of drill string impact on wellbore wall was ...
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A fuzzy logic based classification for assessing of rock mass drillability
This paper describes a fuzzy classification system for evaluating of rock mass drillability. Six parameters; Uniaxial Compressive Strength (UCS), joints dipping, Mohs hardness, joints aperture, joints spacing and grain size have been used. In this fuzzy system, each rock mass is classified into five modes from very poor to excellent condition. As a case study, 15 rock masses in two mines in Iran ...
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Mining
In mines, our equipment is mainly used for blasting drilling, ore crushing and material separation. ABT provides various types of drilling equipment to cope with various mine working conditions, according to different needs, there are suitable equipment to meet your needs. Welcome to consult us, we have professional engineers to provide advice. In open-pit mining, we provide a complete set of ...
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Mining
In mines, our equipment is mainly used for blasting drilling, ore crushing and material separation. ABT provides various types of abt machine tools drilling equipment to cope with various mine working conditions, according to different needs, there are suitable equipment to meet your needs. Welcome to consult us, we have professional engineers to provide advice. In open-pit mining, we provide a ...
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Mining
In mines, our equipment is mainly used for blasting drilling, ore crushing and material separation. ABT provides various types of drilling equipment to cope with various mine working conditions, according to different needs, there are suitable equipment to meet your needs. Welcome to consult us, we have professional engineers to provide advice. In open-pit mining, we provide a complete set of ...
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Acoustic fingerprinting for rock identification during drilling
During the process of mining, it is imperative to know the type and properties of the rocks being handled. The current technology for this involves core drilling, and subsequently subjecting the drilled cores to various tests in the laboratory, to identify the rocks and establish their properties. In many cases, obtaining a sample may be cumbersome and/or non–profitable. This paper presents a ...
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Exhaust Purifier for Rock Drill
Description Gardner Denver MK45H rock drill. Challenge A universal exhaust purifier was required that could easily be retrofitted into the vehicle exhaust pipe. Solution DCL supplied an exhaust purifier with connection cones to match the vehicle exhaust tube diameter. The unit was connected to the exhaust tube with standard muffler u-clamps. Quick-release clamps on the ...
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Prediction of rock fracture toughness modes I and II utilising brittleness indexes
Fracture toughness and brittleness are of the most crucial rock features for underground excavation and drilling in rock mass. Developed standard tests to determine rock fracture toughness are very difficult as well as time consuming; furthermore, they require high-level accuracy during sample preparation and testing. An attempt has been made to propose simple relations to determine fracture ...
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Do you need to rapidly analyse Coltan?
The need for a rapid, simple analysis (carried out by non-laboratory staff) at mines makes a handheld X-ray analyser the ideal analytical technique for analysis of Coltan. The solution Hitachi High-Tech’s X-MET8000 Expert Geo provides fast and accurate on-site analysis of a wide variety of mining sample types, such as drill cores, rocks, cuttings and powders. Results are available in ...
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Estimating rock properties using sound level during drilling: field investigation
The process of drilling, in general, always produces sound as a by-product. Sound is used as a diagnostic tool for identification of faulty components in the mechanical industry. However, its application in the mining industry for estimating rock properties has not been much explored. Knowledge of rock properties is essential for mine planning and design. An attempt has been made in this paper to ...
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A new approach for estimation of properties of metamorphic rocks
Rock properties play an important role in the preliminary design of structures. This research focuses on developing empirical models using multiple regression technique for prediction of physical properties of metamorphic rocks. The model considers the following parameters: drill bit diameter, bit speed, penetration rate and equivalent sound level produced during drilling. The F-test was used to ...
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Petrophysical parameters affecting the microbit drillability of rock
Drillability of rock is one of the important parameter to decide the progress and economics of excavation. It depends on number of parameters like ground condition, drill geometry and other rock parameters. The important physico-mechanical properties were determined. It was found that Uniaxial Compressive Strength, Point load index, tensile strength, shear strength, cohesion are strongly ...
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TWO FUNCTION GASOLINE ROCK HAMMER DRILL
Petrol powered jackhammer DHD-58 is a portable but robust demolition hammer with 2-stroke, 32.7cc engine for removal, drilling, breaking and splitting concrete or other building materials. This gasoline hammer two main functions, one is drilling concrete with an SDS MAX drill bit and also good at breaking and crushing if assemble a flat chisel. It is easy to change these two functions, just ...
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TWO FUNCTION GASOLINE ROCK HAMMER DRILL
Petrol hammer DHD-58 is a portable but robust demolition hammer with 2-stroke, 32.7cc engine for removal, drilling, breaking and splitting concrete or other building materials. Product Description This petrol powered jackhammer has two main functions, one is drilling concrete with an SDS MAX drill bit and also good at breaking and crushing if assemble a flat chisel. It is easy to change these two ...
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A comparison of two instructional approaches in teaching underground rock bolt installation with a Jackleg Drill
An integrated hypermedia training tool on underground rock bolting was evaluated using qualitative and quantitative methodologies to compare it with the traditional method of training underground rock bolters. Usability experiments performed underscore the need to evaluate a new product to ensure that it meets the requirements of users. Statistical results from comparative experiment indicate ...
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Sandvik: Mechanized mining makes sense for Africa`s platinum industry - Case Study
According to equipment supplier Sandvik Mining, mechanized mining's exponential growth dispels the myth that new techniques are not proving profitable on the African continent. In the last decade, according to the company, production volumes of southern African platinum mines rose from 2 million metric tons (mt) in 2000 to 35 million mt just 10 years later, Based on current mine development ...
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Ask a FLUMP Expert. Seven ways to Secure your Traverse System
-For full article with pictures go here: http://www.crisafullipumps.com/dredging-world-news/ When using an unmanned dredge, the propulsion system is critical. The FLUMP, SRS Crisafulli's unmanned dredge, propels itself along a traverse cable. The drive system is onboard. SRS Crisafulli's FLUMP Specialist, Engineer Eric Lillberg, explains seven ways to secure the traverse cables to the ...
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Thermal stress on bottom hole rock of gas drilling
Gas drilling has higher penetration than mud drilling. The greatest reason for this phenomenon with gas is that the gas is greatly cooled by expansion as it passes through the bit and thereby cools the bottom of the hole. The thermal stress at bottom–hole occurs during this process. The concept of thermal crushing of rocks is analysed in this study. The theoretical methods are developed to ...
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Coiled Tube Turbodrilling: a proposed technology to optimise drilling deep hard rocks for mineral exploration
The need to drill deep boreholes more efficiently for mineral exploration has raised the attention to investigate the feasibility of recent drilling technologies for such applications. The two principal methods of Reverse Circulation (RC) and diamond core drilling are usually used in combination by mine operators are subjected to certain limitations and inefficiencies. Considering that delivering ...
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Cutting breakage and transportation mechanism of air drilling
In the air drilling, the mechanism of cutting removal in the annulus is very complicated. The research on this field is limited to theoretical discussion, the explanation using mathematical model have been lacking. This paper proposes a mathematical model of cutting breakage and transportation in air drilling based on the mechanism of rock fragmentation and the theory of gas–solid flow. Also, ...
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