A study on the effect of rainfall and slope characteristics on landslide initiation by means of flume tests
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Landslide initiation has multiple preconditional, preparatory and triggering factors, including rainfall intensity, slope angle and slope moisture content. Previous literature only considers a singular variable in effecting failure. This study shows trends typical of previous literature whilst considering how an amalgamation of assorted variables collaborate to effect failure. To better understand the influences of these factors, a series of tests were conducted using a flume device, employed in the generation of modelled single soil layer slope failures. Experiments were performed in 3 series, determined by rainfall intensity (40, 70 and 100 mm/h) and within these series, alterations were made between slope angle (45–55°) and initial moisture content (5–12%). Failure times occurred once pore water pressure had peaked at positive values, as well as, moisture content equalised throughout the slope. Variations in failure time occurred when altering slope angle and initial moisture content. Increasing the initial moisture content created faster failures whilst slopes inclined 45° failed faster with the exception of 100 mm/h intensity experiments. Initial failure times were summarised and used to develop an intensity-duration threshold function of I = 80.065D−0.596.
KeywordsLandslide initiation Flume tests Shear strength Pore water pressure Intensity-duration threshold
We would like to acknowledge the following people for the assistance and guidance in the construction of this paper; Jovita Citra, for flume lab experimentation setup and field investigation, Yaxu Liu, for assistance in field research and monitoring of site moisture conditions and Griffith University Technical staff for aiding in the construction of the flume instrumentation.
This research was performed with the financial support of the Griffith University Postgraduate Research Scholarship (GUPRS) and the Griffith University Short Term Visiting Research Fellowship.
- Ahmadi-adli M, Huvaj N, Toker N (2017) Rainfall-triggered landslides in an unsaturated soil: a laboratory flume study. Environ Earth Sci (76):735Google Scholar
- Australian standard (1998) AS 12188.8.131.52: Methods of testing soils for engineering purposes–soil strength and consolidation tests–determination of shear strength of a soil–direct shear test using a shear boxGoogle Scholar
- Australian standard (2009) AS 12184.108.40.206: Methods of testing soils for engineering purposes–soil classification tests–determination of the particle size distribution of a soil–standard method of analysis by sievingGoogle Scholar
- Brand EW, Premchitt J, Phillipson HB (1984) Relationship between rainfall and landslides in Hong Kong. In: Proc. 4th Int. Symp. On Landslides, Downsview, Ontario, Canada, pp 377–384Google Scholar
- Craig RF (2004) Craig’s soil mechanics. New Fetter Lane, LondonGoogle Scholar
- Moriwaki H, Inokuchi T, Hattanji T, Sassa K, Ochiai H, Wang G (2004) Failure process in a full-scale landslide experiment using a rainfall simulator. Landslides:277–288Google Scholar
- Olivares L, Damiano E, Greco R, Zeni L, Picarelli L, Minardo A, Guida A, Bernini R (2009) An instrument flume to investigate the mechanics of rainfall-induced landslides in unsaturated granular soils. Geotechnical Testing Journal 32(2): 108–118Google Scholar
- Ravindran S, Gratchev I, Jeng D (2018) Prediction of shear strength of unsaturated soils in landslide-prone areas using direct shear and suction tests under low normal stress condition. Proc. of the 7th International Conference on Unsaturated Soils, Hong KongGoogle Scholar
- Sassa K (1974) Analysis on slope stability: II. Mainly on the basis of the indoor experiments using the standard sand produced in Toyoura, Japan. J Jpn Soc Erosion Control Eng 26(3):8–19 (in Japanese with English abstractGoogle Scholar
- Sassa K (1984) The mechanism starting liquefied landslides and debris flows. Proceedings of 4th International Symposium on Landslides, Toronto, Canada, vol 2, pp 349–354Google Scholar
- Sassa K, Rouhban B, Briceno S, McSaveney M, He B (2013) Landslides: global risk preparedness. https://doi.org/10.1007/978-3-642-22,087-6
- Shokouhi A, Gratchev I, Kim D (2013) Rock slope stability problems in Gold Coast area, Australia. Int J Geomate 4(1):501–504Google Scholar
- Terzaghi K (1925) Principles of soil mechanics. Engineering News Record Vol. 95 Nos. 19–23, 25–27, pp. 742–746, 796–800, 832–836, 874–878, 912–915, 987–990, 1026–1029, 1064–1068. Google Scholar