Challenges in Drill Equipment Selection vis-à-vis Underground Excavations – A Methodology

Prasad, B. N. V. Siva; Murthy, V. M. S. R.; Naik, Sripad R.

doi:10.1007/978-981-16-9770-8_9

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…Currently, seismic geophysical tests are frequently performed as part of geotechnical investigations and are an essential complement to direct exploration techniques [7][8][9][10], particularly in countries with high seismic activity. In these environments, it is necessary to determine the dynamic behavior of the soil to evaluate the problems of seismic amplification and liquefaction of soils or to analyze the seismic response of structures.…”

Section: Introductionmentioning

confidence: 99%

Interpretation Methods for Seismic Downhole Test in Inclined Boreholes

Bautista,

Aguilar

2023

Civ Eng J

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Geotechnical investigations often involve inclined boreholes, which can be used for downhole (DH) seismic surveys. However, as there is no interpretation method for downhole tests in inclined boreholes (IDH), this study proposes alternative interpretation methods based on the direct method (DM), interval method (IM), modified interval method (MIM), and refracted ray path method (RRM). We have named the proposed methods, adding an I to the original name to indicate that they are performed in an inclined well, i.e., DMI, IMI, MIMI, and RRMI. To analyze the applicability of the proposed methods, eight simple models with horizontal layers and four 2D models were used to obtain the P- and S-wave velocity profiles. Among all the proposed methods, the RRMI method showed the best fit between the calculated S-wave velocity (Vs) profile and the real models, providing good reliability. To test the equations and hypotheses, new interpretation steps were developed based on Snell's law and a modification of the numerical bisection method, which showed that the error increased slightly as the dip angle of the well decreased. The next step was to test the accuracy of the RRMI method in the field and develop downhole test processing software for vertical and inclined boreholes. Doi: 10.28991/CEJ-2023-09-10-016 Full Text: PDF

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Section: Introductionmentioning

confidence: 99%

Interpretation Methods for Seismic Downhole Test in Inclined Boreholes

Bautista,

Aguilar

2023

Civ Eng J

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“…Core drill rigs are being used in tough terrain and mining locations. Drilling operations should be optimized for improving the utilization of the drill rigs [75]. It is important to identify the priority factors pertaining to drill rigs.…”

Section: Introductionmentioning

confidence: 99%

Predicting the overall equipment efficiency of core drill rigs in mining using ANN and improving it using MCDM

Balakrishnan¹,

Ilangkumaran²,

Sankaran³

2023

Eksploatacja i Niezawodność – Maintenance and Reliability

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In this manuscript, an attempt has been made to predict and improve the overall equipment effectiveness of core drill rigs. A combined Box–Jenkins and artificial neural network model was used to develop a three parameter model (drill pushing pressure, drill penetration rate & average pillar drill pit cycle time) for predicting effectiveness. the overall equipment efficiency of core drill rigs. The values of mean average percentage error, root mean square error, normalized root mean square error, men bias error, normalized mean biased error and coefficient of determination values were found to be 9.462%, 17.378%, 0.194, 0.96%, 0.0014 and 0.923. Empirical relationships were developed between the input and output parameters and its effectiveness were evaluated using analysis of variance. For attaining 74.9% effectiveness, the optimized values of pushing pressure, penetration rate and average pillar drill pit cycle time were predicted to be 101.7 bar, 0.94 m/min and 272 min, which was validated. Interactions, perturbations and sensitivity analysis were conducted.

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