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

Geofluids - Tập 2021 - Trang 1-10 - 2021
Yong Hong1, Zhushan Shao1, Shi Guang-bin1, Yong Dou2, Weiqin Wang1, Wen Zhang1
1Xi'an University of Architecture and Technology, Xi'an, Shaanxi, 710055, China
2China Coal Xi'an Design Engineering Co., Ltd., Xi'an, Shaanxi 710055, China

Tóm tắt

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.

Từ khóa


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Geofluids

Tập 2021

1-10

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