Rock characterisation using percussive drilling

Schunnesson, Håkan

doi:10.1016/s0148-9062(97)00332-x

Cited by 93 publications

(52 citation statements)

References 5 publications

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“…At a very low feed force, the penetration rate is also higher. This phenomenon has been reported by [6] which explains it as an inadequate contact between the bit and rock, causing free space movement. Further, as shown in Figure 8, the used feed force acting on the bit varies between 20 kN and 22 kN, for hole angles between 90 • and 60 • , which is lower than the optimum feed force between 24 kN and 28 kN.…”

Section: Analyses and Resultsmentioning

confidence: 77%

“…The technique can be used for drilling in different types of rock, it does not cause any disturbances in production, and it provides high-resolution information on the rock mass in an inexpensive way. It has been used for several drilling techniques, including rotary drilling, percussive drilling, and core drilling [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]. However, despite the potential of the technique, it has not yet become an independent tool to support decision-making in underground mine operations.…”

Section: Introductionmentioning

confidence: 99%

“…In percussive drilling, the most important monitored drill parameters are penetration rate, percussive pressure, feed pressure, and rotation pressure. Variations in these parameters along the length of the hole, is the result from the combined effect of variations in the properties of the penetrated rock mass, drill operators, and drill control systems [6,14]. With variations in the rock mass, parameter settings must be adjusted to improve drilling.…”

Section: Introductionmentioning

confidence: 99%

“…With variations in the rock mass, parameter settings must be adjusted to improve drilling. Advanced control systems on modern drill rigs will always adjust drill parameters independently to avoid drilling problems and damage to the drill string and machine [6,14,18].…”

Section: Introductionmentioning

confidence: 99%

“…The torque required to turn the bit mainly depends on bit resistance at the bottom of the hole and frictional resistance between drill rods and hole walls [6]. It is measured in bars.…”

mentioning

confidence: 99%

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Monitoring of Drill System Behavior for Water-Powered In-The-Hole (ITH) Drilling

2017

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A detailed understanding of the drilling system and the drilling control is required to correctly interpret rock mass conditions based on monitored drilling data. This paper analyses data from hydraulic in-the-hole (ITH) drills used in LKAB's Malmberget mine in Sweden. Drill parameters, including penetration rate, percussive pressure, feed pressure, and rotation pressure, are monitored in underground production holes. Calculated parameters, penetration rate variability, rotation pressure variability, and fracturing are included in the analysis to improve the opportunity to predict rock mass conditions. Principal component analysis (PCA) is used to address non-linearity and variable interactions. The results show that the data contain pronounced hole length-dependent trends, both linear and step-wise linear, for most parameters. It is also suggested that monitoring can be an efficient way to optimize target values for drill parameters, as demonstrated for feed force. Finally, principal component analysis can be used to transfer a number of drill parameters into single components with a more straightforward geomechanical meaning.

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Section: Analyses and Resultsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…The torque required to turn the bit mainly depends on bit resistance at the bottom of the hole and frictional resistance between drill rods and hole walls [6]. It is measured in bars.…”

mentioning

confidence: 99%

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Monitoring of Drill System Behavior for Water-Powered In-The-Hole (ITH) Drilling

2017

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Probe drilling ahead of TBMs in difficult ground conditions

Bilgin

Copur

Balcı

2016

TBM Excavation in Difficult Ground Conditions

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Detection of karst caves during tunnel construction using ground‐penetrating radar and advanced drilling: A case study in Guangxi Province, China

Riyan¹,

Liu

Maomao

et al. 2022

Near Surface Geophysics

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In karst topography, hidden caves or underground rivers may imperil the safety of tunnels. It is critical to accurately detect the location and geometric shape of hidden karst caves for assessing the safety of tunnels. This paper reports a case where a large karst cave was exposed during the construction of the Nongmo tunnel in Duan County, Guangxi, China. A 2D ground-penetrating radar survey was employed to preliminarily detect the distribution of hidden karst caves along the tunnel axis. Advanced drilling was used to obtain the velocity of electromagnetic waves and verify the 2D ground-penetrating radar detection. Ground-penetrating radar 3D grid detection was carried out for further detecting the geometric shape of the hidden karst caves. Rotary thrust power ratio, which is a function of drilling speed, rotating speed, propulsion pressure and torque, was proposed to reflect the integrity of the surrounding rocks. It was found that the depth of the peak value in the rotary thrust power ratio curve is consistent with that of the amplitude jump in ground-penetrating radar A-scans and in time-frequency distributions. The results of 3D attributes analysis indicate that due to the variation of highlights in different ground-penetrating radar signal attributes, the obtained karst cave shapes using different attributes would be various. A multi-attributes fusion method was proposed to generate a data volume considering various attributes. The 2D geometric shapes at different depths were obtained using the anomalous body lineament in the generated date volume slices. The 3D geometric shapes were reproduced by combining the obtained 2D geometric shapes at various depths. Based on different detection and analysis methods, the outline shape of karst caves at YK364 + 199 ∼ YK364 + 184 of the Nongmo tunnel was revealed in detail.

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Rock characterisation using percussive drilling

Cited by 93 publications

References 5 publications

Monitoring of Drill System Behavior for Water-Powered In-The-Hole (ITH) Drilling

Monitoring of Drill System Behavior for Water-Powered In-The-Hole (ITH) Drilling

Probe drilling ahead of TBMs in difficult ground conditions

Detection of karst caves during tunnel construction using ground‐penetrating radar and advanced drilling: A case study in Guangxi Province, China

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