Development of a novel numerical indicator (DLPI) for assessing the detachability and liquefaction potentials of soils i
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ORIGINAL ARTICLE
Development of a novel numerical indicator (DLPI) for assessing the detachability and liquefaction potentials of soils in erosion‑prone areas Johnbosco C. Egbueri1,2 · Ogbonnaya Igwe2 Received: 26 July 2020 / Accepted: 6 October 2020 © Springer Nature Switzerland AG 2020
Abstract Soil detachment and liquefaction are some of the most disastrous forms of geotechnical failures facilitating gully erosion, landsliding and mass wasting. Given the myriad of geotechnical parameters that can be used to assess soil detachability and liquefaction, there is usually a sort of conflict between the results and interpretation of influencing parameters. A direct measurement of a soil’s erodibility on the basis of field observation and engineering/index properties is often difficult. Thus, it is interesting to have means by which the erosion potential of a soil can be quantified. In this study, a novel numerical model, DLPI, is proposed and utilized for the assessment of the detachability and liquefaction potentials of tropical soils from massive gullies in southeastern Nigeria. Generally, the engineering properties of the analyzed gully soils indicated that the soils have moderate to high detachment and liquefaction potentials. The DLPI model, which is based on the soil engineering properties, integrates heuristic and entropy methods in its judgement. The integration of both methods in the model development is to provide a more simplified and effective evaluation. The DLPI results ranged from 18.634 to 114.685, and indicated that 10% of the samples showed moderate detachment-liquefaction potential while 50% and 40% showed considerable and high risks, respectively. While SW, SC, SP, and CL soils were identified to have considerable to high detachment-liquefaction potentials, GP soil was identified to have moderate potential. The findings in this paper would be helpful in advancing soil erosion research. Keywords Detachability-liquefaction prediction index (DLPI) · Dispersible soil · Gully · Landslide · Soil erodibility · Soil liquefaction
Introduction Top soil detachment and liquefaction are two important mechanical processes of land degradation. While soil detachability can be defined as a measure of the disintegrative ability and mobility of a soil when exposed to erosive agents (water, ice/glacier, or wind), soil liquefaction can be defined as a phenomenon whereby the compactness and strength of a mass of soil drastically reduces due to buildup of excess pore-water pressure and loss of effective stress, * Johnbosco C. Egbueri [email protected]; [email protected] 1
Department of Geology, Chukwuemeka Odumegwu Ojukwu University, Uli, Nigeria
Department of Geology, University of Nigeria, Nsukka, Nigeria
2
causing the mass of soil to flow in a liquid manner. In other words, detachability defines the tendency of a soil mass to disintegrate and move whereas liquefaction defines the potential of a saturated soil to flow like a liquid. Detachable soils are highly erodible and can liquefy when
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