A parametric study for the design of an optimized ultrasonic-percussive planetary drill tool [PDF]
, 2016 Traditional rotary drilling for planetary rock sampling, in situ analysis, and sample return are challenging because the axial force and holding torque requirements are not necessarily compatible with lightweight spacecraft architectures in low-gravity ...
Harkness, Patrick +4 more
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Geofluids, 2022 During downward mining of a bifurcated coal seam, the roof of the lower coal seam is relatively broken and difficult to control due to the mining influence of the upper coal seam.
Ru Hu +4 more
doaj +1 more source
Rockfall runout, Mount Cimone area, Emilia-Romagna Region, Italy [PDF]
, 2014 Numerous mass movements of different typology characterize both mountainous and piedmont sectors of the Emilia-Romagna Region (Apennine chain, North Italy).
Ercolessi, Giulio +3 more
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Rock mass blastability dependence on rock mass quality.
Bulletin of the Geological Society of Greece, 2013 The present paper tries to investigate the influence of rock mass quality characteristics on blasting results. In order to come to some conclusions, blastability and quality of rock mass were put together using the already known classification systems. Taking into account the quantity of blastability index (BI) for every possible structural appearance ...
Chatziangelou, M., Christaras, B.
openaire +3 more sources
Use of Rock Mass Rating (RMR) values for support designs of tunnels excavated in soft rocks without squeezing problem [PDF]
, 2019 Effect of the rock material strength on the RMR value and tunnel support designs were investigated within this study including site works, analytical and numerical analyses.
Demir, Serhat, Komurlu, Eren
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A Rock Mass Classification Method for Tuff Tunnel Based on the High-Pressure Gas Expansion Method
Journal of Engineering, 2023 A precise rock mass grade result is crucial for directing the tunnel excavation engineering design. A novel rock mass classification method for tuff tunnel based on the high-pressure gas expansion method (HPGEM) was proposed, which was primarily built on
Huaide Peng +4 more
doaj +1 more source
Evaluation of many load tests of passive rock bolts in the Czech Republic [PDF]
, 2017 Within the research project "FR-TI4/329 Research and development - creating an application system for the design and analysis of soil and rock anchors including the development of monitoring elements", an extensive stage of field load tests of rock bolts
Holý, Ondřej
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Revisiting rock classification to estimate rock mass properties
Journal of Rock Mechanics and Geotechnical Engineering, 2019 This paper presents the results of ongoing research carried out by the author exploring methods to provide a more robust estimate of rock mass properties specifically for use in tunnel design.
Robert Bertuzzi
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Classification Method and Application of Rock Fracture Ability by Supercritical CO2 Blasting
Shock and Vibration, 2022 In order to study the fracture ability classification of rock mass under the cracking action of supercritical CO2 phase transition, based on the classification theory of rock mass in blasting engineering, an analytic hierarchy process (AHP)-entropy ...
Xiaohong Zhu, Jianhong Jia, Zhongwei Cai
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Implementation of probabilistic approach to rock mass strength estimation while excavating through fault zones [PDF]
, 2019 Purpose. The paper addresses the rock mass state estimation while excavating a cross-heading through the area of regional fault “Bohdanivskyi” based on probabilistic approach to assessing the rock strength. Methods.
Babets, D +4 more
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