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A platform for research: civil engineering, architecture and urbanism
Energies Within Rock Mass and the Associated Dynamic Rock Failures
https://orcid.org/0000-0001-8478-0240
Abstract Catastrophic dynamic rock failure is one of the most challenging problems existing in the fields of civil tunneling and mining. It occurs in complex environments of geology, stress and excavation, and there is no one set of circumstances that is responsible for the phenomenon. However, a major contributing factor is believed to be energy storage and release. This paper studies and quantifies the energy release concept to advance the understanding and control of dynamic rock failures. The impacts of energy sources within rock masses on dynamic rock failures are assessed. The energy sources include strain and potential energy, the pressure energy of free and adsorbed gas and radiated seismic energy related to rock fracture or faulting. A new time-based coupled model is developed to estimate the ejection velocity when dynamic rock failures occur. Two burst scenarios are demonstrated using the proposed coupled model, i.e., a burst in the development heading of an unsupported face, and a ribside burst in a supported rib. The coupled model results show the superiority of bolts with a capacity for greater plastic elongation. Conveniently from the design perspective, maximum mesh tension is governed entirely by bolt capacity and mesh rupture strain. In addition, a rockburst hazard classification is proposed by examining a broad range of studies conducted in various disciplines to classify the relationship between injury severity and impact velocities. The hazard profile of dynamic rock failures caused by various mine layouts, structural domains, gas environments and geological sequences can then be estimated on the basis of the quantitative analysis.
Energies Within Rock Mass and the Associated Dynamic Rock Failures
https://orcid.org/0000-0001-8478-0240
Abstract Catastrophic dynamic rock failure is one of the most challenging problems existing in the fields of civil tunneling and mining. It occurs in complex environments of geology, stress and excavation, and there is no one set of circumstances that is responsible for the phenomenon. However, a major contributing factor is believed to be energy storage and release. This paper studies and quantifies the energy release concept to advance the understanding and control of dynamic rock failures. The impacts of energy sources within rock masses on dynamic rock failures are assessed. The energy sources include strain and potential energy, the pressure energy of free and adsorbed gas and radiated seismic energy related to rock fracture or faulting. A new time-based coupled model is developed to estimate the ejection velocity when dynamic rock failures occur. Two burst scenarios are demonstrated using the proposed coupled model, i.e., a burst in the development heading of an unsupported face, and a ribside burst in a supported rib. The coupled model results show the superiority of bolts with a capacity for greater plastic elongation. Conveniently from the design perspective, maximum mesh tension is governed entirely by bolt capacity and mesh rupture strain. In addition, a rockburst hazard classification is proposed by examining a broad range of studies conducted in various disciplines to classify the relationship between injury severity and impact velocities. The hazard profile of dynamic rock failures caused by various mine layouts, structural domains, gas environments and geological sequences can then be estimated on the basis of the quantitative analysis.
Energies Within Rock Mass and the Associated Dynamic Rock Failures
https://orcid.org/0000-0001-8478-0240
Abstract Catastrophic dynamic rock failure is one of the most challenging problems existing in the fields of civil tunneling and mining. It occurs in complex environments of geology, stress and excavation, and there is no one set of circumstances that is responsible for the phenomenon. However, a major contributing factor is believed to be energy storage and release. This paper studies and quantifies the energy release concept to advance the understanding and control of dynamic rock failures. The impacts of energy sources within rock masses on dynamic rock failures are assessed. The energy sources include strain and potential energy, the pressure energy of free and adsorbed gas and radiated seismic energy related to rock fracture or faulting. A new time-based coupled model is developed to estimate the ejection velocity when dynamic rock failures occur. Two burst scenarios are demonstrated using the proposed coupled model, i.e., a burst in the development heading of an unsupported face, and a ribside burst in a supported rib. The coupled model results show the superiority of bolts with a capacity for greater plastic elongation. Conveniently from the design perspective, maximum mesh tension is governed entirely by bolt capacity and mesh rupture strain. In addition, a rockburst hazard classification is proposed by examining a broad range of studies conducted in various disciplines to classify the relationship between injury severity and impact velocities. The hazard profile of dynamic rock failures caused by various mine layouts, structural domains, gas environments and geological sequences can then be estimated on the basis of the quantitative analysis.
Energies Within Rock Mass and the Associated Dynamic Rock Failures
Rock Mech Rock Eng
Watson, John (author) / Canbulat, Ismet (author) / Zhang, Chengguo (author) / Wei, Chunchen (author)
2025-01-18
Article (Journal)
Electronic Resource
English
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