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:: Volume 13, Issue 5 (English article specials 2020) ::
2020, 13(5): 59-92 Back to browse issues page
Analysis of a Large-Scale Landslide Using Shear Strength Reduction Factor Method, Case Study: Manjil Landslide
Mahnaz Firuzi *1, Mohammad Hossein Ghobadi, Ali Noorzad, Ehsan Dadashi3
1- , firuzi.mahnaz@yahoo.com
Abstract:   (1943 Views)
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.
Keywords: Manjil landslide, Finite element model, Shear strength reduction factor method, Pile-to-pile cap connections, Stability analysis.
Full-Text [PDF 1565 kb]   (254 Downloads)    
Type of Study: Research Paper | Subject: En. Geology
Received: 2018/01/17 | Accepted: 2019/01/2 | Published: 2020/06/9
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Firuzi M, Ghobadi M H, Noorzad A, Dadashi3 E. Analysis of a Large-Scale Landslide Using Shear Strength Reduction Factor Method, Case Study: Manjil Landslide. Journal of Engineering Geology. 2020; 13 (5) :59-92
URL: http://jeg.khu.ac.ir/article-1-2745-en.html


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Volume 13, Issue 5 (English article specials 2020) Back to browse issues page
نشریه زمین شناسی مهندسی Journal of Engineering Geology
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