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Improving Rock Pillar Stability Guidelines Through Detailed Numerical Investigation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Improving Rock Pillar Stability Guidelines Through Detailed Numerical Investigation./
作者:	Dressel, Evan J.
面頁冊數:	1 online resource (162 pages)
附註:	Source: Masters Abstracts International, Volume: 83-11.
Contained By:	Masters Abstracts International83-11.
標題:	Friction. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=29101674click for full text (PQDT)
ISBN:	9798426889545

Improving Rock Pillar Stability Guidelines Through Detailed Numerical Investigation.
Dressel, Evan J.

Improving Rock Pillar Stability Guidelines Through Detailed Numerical Investigation. - 1 online resource (162 pages)

Source: Masters Abstracts International, Volume: 83-11.

Thesis (M.A.Sc.)--Queen's University (Canada), 2022.

Includes bibliographical references

Pillar stability guidelines, for underground construction in rock, have been presented by various authors in the past, based on a combination of empirical (mostly visual) observations from mining applications and simple numerical elastic stress indices or data from continuum plasticity analysis. There have been numerous developments in the past several decades in mechanistic classification (brittle spalling, effective continuum rockmass, structural control) and mechanism-appropriate modelling and design metrics. The design of pillar dimensions and spacing is a key factor in construction projects beyond mining including the engineering for deep geological repositories, hydroelectric power cavern complexes, underground storage, quarrying and other applications. These applications are situated in a variety of rockmass environments and at stress regimes from shallow to deep. In such applications, the geometry of the pillars and surrounding excavations deviates from the classic mine pillar scenario where the traditional pillar stability charts may not be able to accurately capture the behaviour of hard rock pillars. To assess the viability of pillar stability charts, a similar (to historical experiments), more detailed experiment was conducted simulating 3D Hoek-Brown, finite element method (FEM) pillars, with varying rockmass material parameters. From these model simulations, a five-phase pillar failure classification was developed. Using the classification charts developed, refine pillar stability charts. The refined pillar charts indicate that the material parameters used in the modelling can significantly change a pillar's behaviour and that a single pillar stability chart is likely inadequate for describing the behaviour of mine pillars. The residual behaviour of pillars was also assessed using a correlation developed for determining an estimated residual GSI (and the associated residual strength after yield). The data for the residual pillar data agrees with previous findings that a single chart is inadequate for describing pillar behaviour. Modifying the residual GSI for a pillar can significantly impact the resulting strength predictions for the pillar. Post-yield dilation increases the effective area of the pillar core, increasing pillar stability. Dilation does not have as large of an effect on more slender pillars (< 0.7 W:H ratio) as confinement is lesser on more slender pillars.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2023

Mode of access: World Wide Web

ISBN: 9798426889545Subjects--Topical Terms:

650299
Friction.
Index Terms--Genre/Form:

542853
Electronic books.

Improving Rock Pillar Stability Guidelines Through Detailed Numerical Investigation.
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520 $a Pillar stability guidelines, for underground construction in rock, have been presented by various authors in the past, based on a combination of empirical (mostly visual) observations from mining applications and simple numerical elastic stress indices or data from continuum plasticity analysis. There have been numerous developments in the past several decades in mechanistic classification (brittle spalling, effective continuum rockmass, structural control) and mechanism-appropriate modelling and design metrics. The design of pillar dimensions and spacing is a key factor in construction projects beyond mining including the engineering for deep geological repositories, hydroelectric power cavern complexes, underground storage, quarrying and other applications. These applications are situated in a variety of rockmass environments and at stress regimes from shallow to deep. In such applications, the geometry of the pillars and surrounding excavations deviates from the classic mine pillar scenario where the traditional pillar stability charts may not be able to accurately capture the behaviour of hard rock pillars. To assess the viability of pillar stability charts, a similar (to historical experiments), more detailed experiment was conducted simulating 3D Hoek-Brown, finite element method (FEM) pillars, with varying rockmass material parameters. From these model simulations, a five-phase pillar failure classification was developed. Using the classification charts developed, refine pillar stability charts. The refined pillar charts indicate that the material parameters used in the modelling can significantly change a pillar's behaviour and that a single pillar stability chart is likely inadequate for describing the behaviour of mine pillars. The residual behaviour of pillars was also assessed using a correlation developed for determining an estimated residual GSI (and the associated residual strength after yield). The data for the residual pillar data agrees with previous findings that a single chart is inadequate for describing pillar behaviour. Modifying the residual GSI for a pillar can significantly impact the resulting strength predictions for the pillar. Post-yield dilation increases the effective area of the pillar core, increasing pillar stability. Dilation does not have as large of an effect on more slender pillars (< 0.7 W:H ratio) as confinement is lesser on more slender pillars.
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