The effects of deep cracks on the rain-induced instability of slopes : A case study

Suryo, E.A., Gallage, C., Trigunarsyah, B., & Rachmansyah, A (2012) The effects of deep cracks on the rain-induced instability of slopes : A case study. In Md. Noor, Norhazilan & Ismail, Mohammad (Eds.) Proceedings of APSEC 2012 and ICCER 2012, Universiti Teknologi Malaysia, Mercure Grand Mirama Hotel, Surabaya, Indonesia, pp. 537-542.


Rainfall can disrupt the balance of natural soil slope. This imbalance will be accelerated by existence of cracks in soil slope, which lead to decreasing shear strength and increasing hydraulic conductivity of the soil slope. Some research works have been conducted on the effects of surface-cracks on slope stability. However, the influence of deep-cracks is yet to be investigated. Limited availability of deep crack data due to the lack of effective sub-soil investigation methods could be one of the obstacles. To emphasize the effects of deep cracks in soil slope on its rain-induced instability, a natural soil slope in Indonesia that failed in 31st October 2010 due to heavy rainfall was analyzed for stability with and without deep cracks in the slope. The slope stability analysis was conducted using SLOPE/W coupling with the results of transient seepage analysis (SEEP/W) that simulate the pore-water pressure development in the slope during the rainfall. The results of Electrical Resistivity Tomography (ERT) survey, bore-hole tests and geometrical survey conducted on the slope before its failure were used to identify the soil layers’ stratification including deep cracks, the properties of different soil layers, and geometrical parameters of the slope for the analysis. The results showed that it is vital to consider the existence of deep crack in soil slopes in analysing their instability induced by rainfalls.

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ID Code: 58164
Item Type: Conference Paper
Refereed: Yes
Keywords: Unsaturated Soil Slope, Soil Slope Investigation, Deep-Cracks, Transient Seepage in Soil Slope, Rain-induced Slope Instability
ISBN: 9789834482626
Divisions: Current > Schools > School of Civil Engineering & Built Environment
Current > Schools > School of Earth, Environmental & Biological Sciences
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Please consult the author.
Deposited On: 13 Mar 2013 04:19
Last Modified: 18 Mar 2013 14:45

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