Analysis of a Large-Scale Landslide Using Shear Strength Reduction Factor Method, Case Study: Manjil Landslide

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Firuzi Mahnaz; Ghobadi Mohammad H.; NOORZAD ALI; Dadashi Ehsan

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Paper Information

Journal: JOURNAL OF ENGINEERING GEOLOGY Year:2020 | Volume:13 | Issue:Supplement 5 Page(s): 59-92

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Title

Analysis of a Large-Scale Landslide Using Shear Strength Reduction Factor Method, Case Study: Manjil Landslide

Author(s)

Firuzi Mahnaz | Ghobadi Mohammad H. | NOORZAD ALI | Dadashi Ehsan | Issue Writer Certificate

Keywords

Manjil landslide

Finite element model

Shear strength reduction factor method

Pile-to-pile cap connections

Stability analysis

Abstract

Slope stability could be a major concern during the construction of infrastructures. This study is focused to analyze the slope stability of Manjil landslide that was located 41+400 to 42+200 km along Qazvin-Rasht freeway, Iran. The Manjil landslide, which had 168 m long and approximately 214 m wide, was occurred due to inappropriate cutting in June 2013 and led to destructive and closure of freeway. Slope Stability analysis was carried out using a finite element shear strength reduction method (FE-SRM). The PHASE2D program was utilized in order to model the slope cutting and stability of landslide. Slope angle was flatted with 3H: 2V geometry and stabilized with piling. The results indicated safety factors of 1. 95 and 1. 17 in the static and pseudo-static states, respectively, while the maximum bending moment with single pile (SP) in the pseudo-static state was 5. 69 MN. Maximum bending moment of the pile around the slip surface was significantly large and more than the bending moment capacity of the pile. Due to the large bending moment on the pile, Pile-to-pile cap connections (two pile group: 2PG) should be designed at the toe of the slope. The obtained results showed reduction of this parameter to 2. 48 MN. Thus, it can be concluded that 2PG is a suitable stabilization method for the Manjil landslide.

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APA: Copy

Firuzi, Mahnaz, Ghobadi, Mohammad H., NOORZAD, ALI, & Dadashi, Ehsan. (2020). Analysis of a Large-Scale Landslide Using Shear Strength Reduction Factor Method, Case Study: Manjil Landslide. JOURNAL OF ENGINEERING GEOLOGY, 13(Supplement 5 ), 59-92. SID. https://sid.ir/paper/780724/en

Vancouver: Copy

Firuzi Mahnaz, Ghobadi Mohammad H., NOORZAD ALI, Dadashi Ehsan. Analysis of a Large-Scale Landslide Using Shear Strength Reduction Factor Method, Case Study: Manjil Landslide. JOURNAL OF ENGINEERING GEOLOGY[Internet]. 2020;13(Supplement 5 ):59-92. Available from: https://sid.ir/paper/780724/en

IEEE: Copy

Mahnaz Firuzi, Mohammad H. Ghobadi, ALI NOORZAD, and Ehsan Dadashi, “Analysis of a Large-Scale Landslide Using Shear Strength Reduction Factor Method, Case Study: Manjil Landslide,” JOURNAL OF ENGINEERING GEOLOGY, vol. 13, no. Supplement 5 , pp. 59–92, 2020, [Online]. Available: https://sid.ir/paper/780724/en

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