A critical appraisal of the protodyakonov index

Paithankar, A.G.; Misra, Gadadhar

doi:10.1016/0148-9062(76)91545-x

Cited by 32 publications

(11 citation statements)

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“…The accuracy of the Protodyakonov Index is susceptible to the duration of sieving and degree of compaction of the fines in the volumeter, which depends on the number of blows (Paithankar and Misra, 1976). It also varies with the number of blows for the same rock depending on the hardness of the rock.…”

Section: Protodyakonov Indexmentioning

confidence: 99%

Correlating index properties of rocks with P-wave measurements

Khandelwal

Ranjith

2010

Journal of Applied Geophysics

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Section: Protodyakonov Indexmentioning

confidence: 99%

Correlating index properties of rocks with P-wave measurements

Khandelwal

Ranjith

2010

Journal of Applied Geophysics

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“…29 Drilling specific energy (SE drill ) can be defined as the energy, required to remove a unit volume of a rock, 18,31 to create a new surface area, 35 from a source expended through the bit in drilling a unit volume of rock. 19 Theoretically, SE drill is considered as an intrinsic property for a particular rock type.…”

Section: Introductionmentioning

confidence: 99%

Automatic drilling control based on minimum drilling specific energy using PDC and WC bits

Ersoy¹

2003

Mining Technology

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The drilling specific energy (SE drill ) is a very significant measure of drilling performance. It is directly compatible with cost/metre, because it relates to the amount of energy required to penetrate rock. SE drill can also be used to quantify the efficiency of rock working processes and to indicate bit conditions, rock strength and rock hardness during drilling. The focus of this study is to evaluate the optimum performance of polycrystalline diamond compact (PDC) and tungsten carbide (WC) bits using a criterion based on maximum feed rate at minimum SE drill or vice versa. A variety of coal-measure rock types were drilled using PDC and WC bits using a fully instrumented and automatic drilling rig at six different rotational speeds (rpm) and an over range of thrust applied to the bit. The operating parameters of the drill bits were monitored on a computer-controlled logging system during the drilling trials. The control system is used to monitor the drilling speed, the thrust, the power developed at the bit, the feed rate, the distance penetrated and the presence of an adequate amount of drilling fluid. The strategy followed while drilling was to maintain a constant level of power at the bit in order to maximise the feed rate and minimise the rate of bit wear. Extensive laboratory tests have been carried out on the drilled rocks including mineralogical, physical and index properties analysis. Similarities between the rock strength and SE drill are reported. The destruction specific energy (SE des ) was estimated from the area (integral) under the stress-strain envelope in an unconfined compression test. This method provides a better understanding of the relationships between drilling specific energy, drilling rate and the main mechanical rock character. The relationship of the SE drill to operating parameters of the bits and the rock properties was evaluated using optimum drilling data.

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“…Two types of specific energy can be distinguished in the rotation perforation, the one required to move a rock volume unit during rotation perforation (SEv) Teale [1], and the energy to generate a new surface area (SEa) Paithankar and Misra [11]. Specific energy is a cut mechanic efficiency index and can be considered as the sum both the pressure energy strength e t and the rotation energy e r…”

Section: Parameters In Percussion Perforation and Tbm Excavationmentioning

confidence: 99%

Measures in the underground work method to determine the mathematical relations that predicts rock behaviour

Torno¹,

Velasco²,

Diego³

et al. 2009

WIT Transactions on Modelling and Simulation

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The perforation parameter measure was introduced in geological prospecting and in the mining, petrol and gas industry, becoming an efficient tool allowing one to identify in detail and predict the geological and geomechanical characteristics while drilling is being carried out. The field measures and the calibration requirements of the tools and equipment used, which constitute the main obstacle in the prediction model establishment. Analogously, in underground excavations, the continuous knowledge of the rock mass, geological and geomechanical properties in front of the excavation wall during the operations, is of great importance in designing optimum, and also in the planning of the work carried out by this equipment and machinery. Through intense work measure campaigns, in the present work, the mathematical relations obtained in tunnel boring through a percussion perforation in blasting by a jumbo and a tunnel boring machine (TBM) are shown. Considering percussion perforation blasting for the models establishment or for the drilling parameters recorders (DPR) and tool adjustment, parameters such as uniaxial compressive strength, specific cut energy and destructive energy were used. Considering TBM and taking into account the high variable number that intervene in the tunnel boring process and also based on easily obtained parameters such as the already defined specific cut energy and the penetration index, we have reached a relation between the latter parameters and the rock mass rating index (RMR), which allows to adjust and subsequently predict the geological exploration from data which were previously carried out (were carried out previously to the project).

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A critical appraisal of the protodyakonov index

Cited by 32 publications

References 1 publication

Correlating index properties of rocks with P-wave measurements

Correlating index properties of rocks with P-wave measurements

Automatic drilling control based on minimum drilling specific energy using PDC and WC bits

Measures in the underground work method to determine the mathematical relations that predicts rock behaviour

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