Empirical Performance Prediction for Raise Boring Machines Based on Rock Properties, Pilot Hole Drilling Data and Raise Inclination

The basic aim of this study is to develop empirical models for predicting performances of pilot hole drilling and reaming for raise boring operations using rock properties and pilot hole drilling operational parameters for classified raise inclinations [vertical (90°) and inclined (70°)] that could...

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Bibliographic Details
Published in:Rock mechanics and rock engineering 2021-04, Vol.54 (4), p.1707-1730
Main Authors: Shaterpour-Mamaghani, Aydin, Copur, Hanifi
Format: Article
Language:English
Subjects:
Boring machines
Civil Engineering
Compressive strength
Drilling
Drilling machines (tools)
Earth and Environmental Science
Earth Sciences
Elasticity
Empirical analysis
Feasibility studies
Geophysics/Geodesy
Mathematical models
Mechanical properties
Original Paper
Parameters
Performance prediction
Physical properties
Prediction models
Reaming
Regression analysis
Rock masses
Rock properties
Rocks
Tensile strength
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Summary:The basic aim of this study is to develop empirical models for predicting performances of pilot hole drilling and reaming for raise boring operations using rock properties and pilot hole drilling operational parameters for classified raise inclinations [vertical (90°) and inclined (70°)] that could be used in feasibility and operational stages of a project. Field study includes collecting performance and operational parameters including rotational speeds, tricone bit and reamer head torques, weight on bit (pushing force), net reaming thrust (pulling) force, unit penetration rate, and field-specific energy. Totally 21 different rocks are sampled in eight different sites to define physical and mechanical properties. The empirical models developed by performing multi-variable regression analyses for the vertical and inclined reaming and pilot hole drilling data groups indicate that static elasticity modulus, dynamic elasticity modulus, uniaxial compressive strength, Brazilian tensile strength, and rock quality designation are the most important intact rock and rock mass properties affecting performances of the vertical and inclined reaming and pilot hole drilling. This study should be continued to develop more generalized and reliable prediction models, especially by adding different reamer head diameters and raise inclinations to the database as predictive parameters.
ISSN:0723-2632
1434-453X
DOI:10.1007/s00603-020-02355-1