Results 31 to 40 of about 120,559 (311)
Applied Sciences, 2023 Continuous mining is one of the development goals for metal mines, and the application of coal mining equipment represented by shearers provides a reference for continuous mining. However, rock in metal mines is generally harder than coal, making cutting
Weipeng Xu +6 more
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Rock mass ratings and properties
, 2019 Engineers have excavated rocks for mining and tunnel purposes for hundreds of years. Unfortunately, there have been several occasions where a section or the whole tunnel collapsed in weak or heavily weathered rocks.
Gratchev, Ivan, Ivan Gratchev
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Case Studies in Construction MaterialsThe combination of nanocolloidal silica and aluminate cement is a potential technical approach to solve the problem of mudstone grouting, but there is a lack of high-performance admixtures to improve early strength and gel time.
Dongjiang Pan +3 more
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, 2019 This chapter introduces basic geology and discuss the effect of rock structures in relation to rock properties. Rock formation is a complex process that occurs in the lithosphere, and it is accompanied by tectonic activities such as plate movements ...
Gratchev, Ivan, Ivan Gratchev
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Rapid photogrammetric method for rock mass characterization in underground excavations
, 2023 Underground excavation mapping and rock mass characterization are critical for ensuring the safety, proper design, and maintenance of underground infrastructure.
Prittinen, Markus +4 more
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Rock Mass Quality Evaluation Based on Unascertained Measure and Intuitionistic Fuzzy Sets
Complexity, 2020 Evaluation of rock mass quality is of great significance to the design and construction of geotechnical engineering. In order to evaluate the quality of engineering rock mass scientifically and deal with the fuzzy information in the rock mass quality ...
Shuliang Wu, Xidong Du, Shan Yang
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Applied Sciences, 2019 In extensively used empirical rock-mass classification systems, the rock-mass rating (RMR) and tunneling quality index (Q) system, rock-mass quality, and tunnel span are used for the selection of rock bolt length and spacing and shotcrete thickness.
Jonguk Kim +4 more
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Elastic moduli for fractured rock mass
, 2013 The presence of joint discontinuities has long been recognized as an important factor influencing the mechanical behavior of rock masses. This paper proposes a stress-strain model for an assemblage of intact rock blocks separated by joint planes.
Huang, T. H.; Chang, C. S.; Yang, Z. Y.
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Rock mass quality classification based on fuzzy comprehensive evaluation and neural network
You-qi chuyun, 2022 Aiming at the problems of subjectivity and fuzziness in the traditional rock mass quality classification methods, a basic model of rock mass quality classification was established based on the fuzzy theory.
Shaodong JING +3 more
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, 2020 A tunnelling project is normally initiated with a site investigation to determine the in situ rock mass conditions and to generate the basis for the tunnel design and rock support. However, since site investigations often are based on limited information
Johansson, Daniel, +7 more
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