We observe refracted P- and S-waves simultaneously in an underground mine panel. • We identify high vertical stress areas of the panel using tomographic velocities. • …
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The notable difference between deep mining and shallow mining lies in the special engineering environment of deep mining. Under the complex environment of "high in situ stress, high temperature, high water pressure, and mining disturbance," the structure, basic physical and mechanical characteristics, and engineering response of the deep rock mass are …
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1. Heat Stress Hazards. Heat stress severely threatens miner health and safety, especially in hot and humid areas. With the physically demanding nature of mining jobs and the weight of their protective gear, miners are more likely to develop heat-related illnesses due to increased body heat production and restricted heat dissipation.
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Many studies have shown that measuring stress change is a practical procedure to observe mining-induced stresses. However, it is often difficult to interpret stress change …
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Under the combination of in situ stress field and mining activities, mining-induced stress concentrations caused by the redistribution of surrounding rock stress will lead to rock burst, spalling, and other failure types, which seriously hinders the …
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This chapter presents various methods by which it is possible to estimate the stress concentrations, stress shadows, and structure performance that occur in a complex excavation sequence such as that encountered in mine design.
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Heat stress is a major concern for the health, safety and productivity of miners working in hot and humid underground mines. At greater depth, heat inside underground mines increases due to ...
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The most complex condition in mine stresses is found in simple The stresses, in the simplest structures are often those we find most difficult to analyze. 911 Metallurgist is a trusted resource for practical insights, solutions, and support in mineral processing engineering, helping industry professionals succeed with proven expertise. | Mine ...
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Results show that anomalous zones in wave velocities and b -values form at the intersections of extraction drifts, strike drifts, cross drifts, and connection roadways influenced by mining...
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In situ rock stresses are directly associated with the stability of underground openings and thus the state of in situ rock stress is a crucial factor for the design of underground excavations. The consequences of the rock stresses are rock deformation and rock failure.
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in situ stress characteristics at the Lucky Friday Mine, Mullan, ID. An analysis of these data revealed that significant local variations in in situ stress are present in this mine and that these variations existed prior to mining. High stresses were found to be associated with the most competent strata and a locked section of a fault.
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Many studies have shown that measuring stress change is a practical procedure to observe mining-induced stresses. However, it is often difficult to interpret stress change measurements and 3D-models are required to properly explain field observations because each mining step alters the stress field.
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Erosion – if horizontal stresses become 'locked in', then the erosion/removal of overburden (i.e. decrease in V) will result in an increase in K ratio ( H/ V). Tectonics – different forms of tectonic activity (e.g. subduction zones), can produce high horizontal stresses.
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This chapter presents various methods by which it is possible to estimate the stress concentrations, stress shadows, and structure performance that occur in a complex excavation …
WhatsApp: +86 18221755073
in situ stress field will provide important information for ongoing observational evidence of stress field orientation (Whyatt and projects aimed at developing improved mining methods and others, 1995b).
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The U.S., Australian, and United Kingdom coal and the Canadian hard rock mining industries have long recognized the significance of high horizontal stresses as a factor affecting the stability of roof and rib conditions in underground mines. Recently, a growing segment of the U.S. underground stone mining industry has also begun to recognize that horizontal stresses occur …
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Heat stress is a major concern for the health, safety and productivity of miners working in hot and humid underground mines. At greater depth, heat inside underground mines increases due to ...
WhatsApp: +86 18221755073
Marston's theory and its modifications are being used to determine the average vertical stress variation with depth within a cavity with vertical wall, backfilled with granular material. In the past, this has been applied in trenches, mine stopes and silos of different cross sections. In all situations, at very large depths, the vertical stresses become asymptotic. The …
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Mining Engineering Department, K ing Abdulaziz University, Jeddah, Kingdom of Saudi Arabi a. ... stresses), whereas inter nal stresses contained o f residual stresses. Var ious other .
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We observe refracted P- and S-waves simultaneously in an underground mine panel. • We identify high vertical stress areas of the panel using tomographic velocities. • Classified high vertical stress areas match high-energy in-panel microseisms. • Fault zone and mined out voids affect vertical stress redistribution of the panel. •
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"Discover the most common hazards on mine sites, from machinery accidents to toxic exposure. Learn key safety tips to prevent incidents and protect workers."
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High mining-induced stresses can cause a series of problems related to the stability of entries and pillars including roof fall, rib failure, floor heave, and even coal bursts. In extreme cases, stress relief measures have to be carried out to help control those mining-induced stress-related problems. This article presents a field experiment of ...
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in situ stress field will provide important information for ongoing observational evidence of stress field orientation (Whyatt and projects aimed at developing improved mining methods and …
WhatsApp: +86 18221755073
Under the combination of in situ stress field and mining activities, mining-induced stress concentrations caused by the redistribution of surrounding rock stress will lead to rock burst, spalling, and other failure types, which seriously hinders the …
WhatsApp: +86 18221755073
Canadian hard rock mining industries have long recognized the significance of high horizontal stresses as a factor affecting the stability of roof and rib conditions in underground mines. Recently, a growing segment of the U.S. underground stone mining industry has also begun to recognize that horizontal
WhatsApp: +86 18221755073
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Monitoring of ground conditions in mines may be carried out for a variety of reasons, including obtaining data needed for mine design, such as rock mass deformability or rock stresses; verifying design data and assumptions, thereby allowing calibration of computer models and adjustment of mining methods to improve stability; assessing the ...
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Knowledge of ground stresses is crucial for ground control activities such as the design of underground openings, selection of support systems, and analysis for stability. However, it is a known fact that far field stresses experience changes in orientation and magnitude due to the presence of geological structures and due to the excavations created by …
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In situ rock stresses are directly associated with the stability of underground openings and thus the state of in situ rock stress is a crucial factor for the design of …
WhatsApp: +86 18221755073
in situ stress characteristics at the Lucky Friday Mine, Mullan, ID. An analysis of these data revealed that significant local variations in in situ stress are present in this mine and that these …
WhatsApp: +86 18221755073