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https://www.allacronyms.com/ESR/Excavation_Support_Ratio
What is the abbreviation for Excavation Support Ratio? What does ESR stand for? ESR abbreviation stands for Excavation Support Ratio.
http://www.rockmass.net/files/short_on_Q-system.pdf
underground opening. This equivalent dimension, which is a function of the size and type of the excavation, is obtained by dividing the span, diameter or wall height of the excavation (Dt) by a quantity called the excavation support ratio (ESR), given as: ESR Dt De = Ratings of ESR …
https://www.acronymattic.com/Excavation-Support-Ratio-(ESR).html
How is Excavation Support Ratio abbreviated? ESR stands for Excavation Support Ratio. ESR is defined as Excavation Support Ratio rarely.
http://wp.kntu.ac.ir/ghasemzadeh/course/rock%20mechanics/ROCK%20MEC.2-%20clasification.pdf
– ESR = excavation support ratio – ESR is a function of the tunnel use and acceptable level of risk ESR Excavation span or height De Rock Mechanics ٧٠ ESR Values (Barton et al 1974) Temporary mine openings 3 - 5 Permanent mine openings, water tunnels for hydro power, etc. 1.6 - 2 Power stations, major road & railway tunnels,etc. 1
https://www.saimm.co.za/Journal/v105n04p275.pdf
where: ESR (excavation support ratio) is a value that is assigned to an excavation in terms of the degree of security that is demanded of the installed support system to maintain the stability of the excavation. Hutchinson and Diederichs9 recommend that an ESR of not more than 3 be used for temporary mine openings.
https://www.scribd.com/presentation/191595299/Rock-Mass-Classification
Excavation Support Ratio, ESR Barton (1974) The crusher station permanent mine openings, ESR = 1.6 De = 15/ 1.6 = 9.4 From the graph, the crusher falls into category 4 which requires a pattern of rockbolts (spaced at 2.3 m) and 40-50 mm of unreinforced shotcrete5/5(1)
http://www.srmeg.org.sg/docs/Rock%20engineering%20-%20NUS%20Lecture%20Sept%2006%20(Handout).pdf
Roof: L = 2 + 0.15B/ESR Walls: L = 2 + 0.15H/ESR L = meters; B = Span; H = wall height; ESR = Excavation Support Ratio 62 Quantifying Shotcrete Design Shotcrete not normally modelled as structural element in numerical analysis Nominal shear strength = 2 Mpa Nominal bonding strength = 0.5 Mpa Estimate rock wedge volume
https://www.passeidireto.com/arquivo/23187297/support-of-underground-excavations-in-hard-rock/15
Excavation span, diameter or height (m) Excavation Support Ratio The value of ESR is related to the intended use of the excavation and to the degree of security which is demanded of the support system installed to maintain the stability of the excavation.
http://www.rockmass.net/files/combining_RMR-Q-RMi.pdf
ratio between the span or wall height of the opening and the stability requirements to the use of the tunnel or cavern (excavation support ratio called ESR the Q value defines the rock support in support chart, see a
http://ijetmas.com/admin/resources/project/paper/f201509011441077931.pdf
of the Excavation Support Ratio (ESR) for railway tunnels have been used to calculate the Q-value and determine the support requirements in the support chart related to the Q-system. International Journal of Engineering Technology, Management and Applied Sciences www.ijetmas.com August 2015, Volume 3, Issue 8, ISSN 2349-4476
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