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https://doi.org/10.5194/nhess-2020-58
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/nhess-2020-58
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 30 Mar 2020

Submitted as: research article | 30 Mar 2020

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This preprint is currently under review for the journal NHESS.

Stability evaluation and potential failure process of rock slopes characterized by non-persistent fractures

Wen Zhang1, Jia Wang1, Peihua Xu1, Junqing Lou2, Bo Shan2, Fengyan Wang3, Chen Cao1, Xiaoxue Chen1, and Jinsheng Que4 Wen Zhang et al.
  • 1College of Construction Engineering, Jilin University, Changchun, 130026, China
  • 2Northeast Electric Power Design Institute CO., LTD. of China Power Engineering Consulting Group, Changchun, 130026, China
  • 3College of Geo-Exploration Science and Technology, Jilin University, Changchun, 130026, China
  • 4CCB Cost Engineering & Consulting Co., Ltd., Beijing, 100000, China

Abstract. Slope failure, which causes destructive damage and fatalities, is extremely common in mountainous areas. Therefore, the stability and potential failure of slopes must be analyzed accurately. For most fractured rock slopes, the complexity and random distribution of structural fractures make the aforementioned analyses considerably challenging for engineers and geologists worldwide. This study aims to solve this problem by proposing a comprehensive approach that combines the discrete fracture network (DFN) modeling technique, synthetic rock mass (SRM) approach, and statistical analysis. Specifically, a real fractured rock slope in Laohuding Quarry in Jixian County is studied to show this comprehensive approach. DFN simulation is performed to generate non-persistent fractures in the cross section of the slope. Subsequently, SRM approach is applied to simulate the slope model using 2D particle flow code software (PFC2D). A stability analysis is carried out based on the improved gravity increase method, emphasizing the effect of stress concentration throughout the formation of the critical slip surface. The collapse, rotation, and fragmentation of blocks and the accumulation distances are evaluated in the potential failure process of the rock slope. 100 slope models generated with different DFN models are used to repeat the aforementioned analyses as the result of a high degree of variability in DFN simulation. The critical slip surface, factor of safety, and accumulation distance are selected by statistical analysis for safety assurance in slope analysis and support.

Wen Zhang et al.

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Wen Zhang et al.

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Latest update: 31 May 2020
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Short summary
Slope failure is extremely common in mountainous areas. Therefore, the stability and potential failure of slopes must be analyzed accurately. For most fractured rock slopes, the aforementioned analyses arec onsiderably challenging. This study aims to propose a comprehensive approach that combines three well-established methods to conduct the aformentioned analyses. Finally, the critical slip surface, factor of safety, and accumulation distance are selected for safety assurance in slope analysis.
Slope failure is extremely common in mountainous areas. Therefore, the stability and potential...
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