Freeze-Thaw Effects on Stability of Open Pit Slope in High-Altitude and Cold Regions

The cycle of the freeze-thaw action must be taken into account in the stability analysis of an open pit slope in the high-altitude and cold regions, because the natural process of freeze-thaw poses a significant effect on mechanical properties of the rock mass. To achieve this purpose, a linear rela...

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Autores principales:	Yong Hong, Zhushan Shao, Guangbin Shi, Yong Dou, Weiqin Wang, Wen Zhang
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi-Wiley 2021
Materias:	Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/89298bfe300041498166776bf167444c
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spelling	oai:doaj.org-article:89298bfe300041498166776bf167444c2021-11-08T02:36:33ZFreeze-Thaw Effects on Stability of Open Pit Slope in High-Altitude and Cold Regions1468-812310.1155/2021/8409621https://doaj.org/article/89298bfe300041498166776bf167444c2021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/8409621https://doaj.org/toc/1468-8123The cycle of the freeze-thaw action must be taken into account in the stability analysis of an open pit slope in the high-altitude and cold regions, because the natural process of freeze-thaw poses a significant effect on mechanical properties of the rock mass. To achieve this purpose, a linear relationship between the geological strength index (GSI) and the Tianshan slope rock mass rating (TSMR) system is established considering the effect of the freeze-thaw action by introducing a freeze-thaw correction coefficient δ. The GSI value is modified for rock mass in high-altitude and cold regions. The improved Hoek-Brown criterion considers the influences of the freeze-thaw action and steep and gentle slopes. The research outcome is applied in the No. 4 minefield open pit coal mine in the Muli mining area. Numerical calculations are performed by inputting rock mass mechanical parameters obtained in traditional and modified criterions, to discuss the influences of the freeze-thaw action on the stabilities of both the present mining slope and the final slope at the end of the designed mining. The results show that the safety factors of the original slope are 2.33 and 1.67, respectively, while after the modification, they are 2.14 and 1.61, respectively. In terms of the No. 4 minefield open pit coal mine, the slope stability meets the design requirement, although taking the freeze-thaw cycle into account.Yong HongZhushan ShaoGuangbin ShiYong DouWeiqin WangWen ZhangHindawi-WileyarticleGeologyQE1-996.5ENGeofluids, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geology QE1-996.5
spellingShingle	Geology QE1-996.5 Yong Hong Zhushan Shao Guangbin Shi Yong Dou Weiqin Wang Wen Zhang Freeze-Thaw Effects on Stability of Open Pit Slope in High-Altitude and Cold Regions
description	The cycle of the freeze-thaw action must be taken into account in the stability analysis of an open pit slope in the high-altitude and cold regions, because the natural process of freeze-thaw poses a significant effect on mechanical properties of the rock mass. To achieve this purpose, a linear relationship between the geological strength index (GSI) and the Tianshan slope rock mass rating (TSMR) system is established considering the effect of the freeze-thaw action by introducing a freeze-thaw correction coefficient δ. The GSI value is modified for rock mass in high-altitude and cold regions. The improved Hoek-Brown criterion considers the influences of the freeze-thaw action and steep and gentle slopes. The research outcome is applied in the No. 4 minefield open pit coal mine in the Muli mining area. Numerical calculations are performed by inputting rock mass mechanical parameters obtained in traditional and modified criterions, to discuss the influences of the freeze-thaw action on the stabilities of both the present mining slope and the final slope at the end of the designed mining. The results show that the safety factors of the original slope are 2.33 and 1.67, respectively, while after the modification, they are 2.14 and 1.61, respectively. In terms of the No. 4 minefield open pit coal mine, the slope stability meets the design requirement, although taking the freeze-thaw cycle into account.
format	article
author	Yong Hong Zhushan Shao Guangbin Shi Yong Dou Weiqin Wang Wen Zhang
author_facet	Yong Hong Zhushan Shao Guangbin Shi Yong Dou Weiqin Wang Wen Zhang
author_sort	Yong Hong
title	Freeze-Thaw Effects on Stability of Open Pit Slope in High-Altitude and Cold Regions
title_short	Freeze-Thaw Effects on Stability of Open Pit Slope in High-Altitude and Cold Regions
title_full	Freeze-Thaw Effects on Stability of Open Pit Slope in High-Altitude and Cold Regions
title_fullStr	Freeze-Thaw Effects on Stability of Open Pit Slope in High-Altitude and Cold Regions
title_full_unstemmed	Freeze-Thaw Effects on Stability of Open Pit Slope in High-Altitude and Cold Regions
title_sort	freeze-thaw effects on stability of open pit slope in high-altitude and cold regions
publisher	Hindawi-Wiley
publishDate	2021
url	https://doaj.org/article/89298bfe300041498166776bf167444c
work_keys_str_mv	AT yonghong freezethaweffectsonstabilityofopenpitslopeinhighaltitudeandcoldregions AT zhushanshao freezethaweffectsonstabilityofopenpitslopeinhighaltitudeandcoldregions AT guangbinshi freezethaweffectsonstabilityofopenpitslopeinhighaltitudeandcoldregions AT yongdou freezethaweffectsonstabilityofopenpitslopeinhighaltitudeandcoldregions AT weiqinwang freezethaweffectsonstabilityofopenpitslopeinhighaltitudeandcoldregions AT wenzhang freezethaweffectsonstabilityofopenpitslopeinhighaltitudeandcoldregions
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Freeze-Thaw Effects on Stability of Open Pit Slope in High-Altitude and Cold Regions

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