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Chukwueloka A.U. Okeke

Bio: Chukwueloka A.U. Okeke is an academic researcher from Covenant University. The author has contributed to research in topics: Lime & Bank erosion. The author has an hindex of 6, co-authored 18 publications receiving 103 citations.

Papers
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Journal ArticleDOI
TL;DR: In this article, a series of large-scale (outdoor) experiments were designed and conducted to identify premonitory factors that may be used in failure prediction for actual landslide dams, including surface deformation, especially dam-crest settlement, dam seepage-water turbidity and self-potential across the dam crest.

45 citations

Journal ArticleDOI
10 Nov 2019
TL;DR: In this paper, the authors illuminate the impacts of cement production emissions on the environment and suggest that more data collection, pollutant characterization, risk assessment and dispersion analysis should be carried out in developing countries.
Abstract: The aim of this paper is to illuminate the impacts of cement production emissions on the environment. Various research work has shown that countries in sub-Saharan Africa, suffer the most from environmental pollution especially air pollution. One of such contributing factors is the behavioural pattern of workers and traders living close to production plants. Significantly also, data are not available in this region. The need for cement as well as the presence of local raw materials, coupled with the need for local content has resulted in an increase in the number of cement plants. Areas within and around the cement plant are exposed to various air pollutants. These pollutants affect the life and wellbeing of workers, children and people in close communities as well as the flora and fauna. Diseases such as chronic obstructive pulmonary, silicosis, preterm delivery, psychasthenia, endocrine disruption, cancer and infertility are associated with these pollutants. This paper describes the impacts of these pollutants on human’s health and plant’s growth as well as where studies should focus on in the future. Various high impact papers were selected and cogent findings as it affects different classes of people were discussed in this paper. It is recommended that more data collection, pollutant characterization, risk assessment and dispersion analysis should be carried out in developing countries. More research should be undertaken to determine the impact of alternative fuel and the effectiveness of dust control technologies used in various cement plants.

38 citations

Journal ArticleDOI
TL;DR: In this paper, the use of two wastes (RHA and CKD) for improving the mechanical strength of a subgrade soil obtained from a failed road section in Nigeria was explored.

30 citations

Journal ArticleDOI
01 Nov 2019

26 citations


Cited by
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Journal Article
TL;DR: In this paper, a series of conventional triaxial tests on fully saturated and on partly saturated specimens were performed under drained and undrained conditions to study the regions of stable and unstable behavior.
Abstract: Soils that exhibit nonassociated flow may, according to stability postulates by Drucker and by Hill, become unstable when exposed to certain stress paths inside the failure surface. Series of conventional triaxial tests on fully saturated and on partly saturated specimens were performed under drained and undrained conditions to study the regions of stable and unstable behavior. For specimens that compress and have degrees of saturation higher than critical, undrained conditions lead to effective stress paths directed within the region of potential instability, and instability was observed provided the yield surface opens up in the outward direction of the hydrostatic axis. Thus, instability occurs inside the failure surface. Instability is not synonymous with failure, although both may lead to catastrophic events. The location of the instability line is discussed. Examples of a shallow submarine slope and a nearly fully saturated steeper slope representing a tailings dam, which both should remain stable a...

286 citations

03 Apr 2014
TL;DR: In this paper, the authors demonstrate how multi-temporal LiDAR and high-resolution aerial imagery can be used to determine processes and volumes of riverbank erosion at a catchment scale.
Abstract: Riverbank erosion is a major contributor to catchment sediment budgets. At large spatial scales data is often restricted to planform channel change, with little information on process distributions and their sediment contribution. This study demonstrates how multi-temporal LiDAR and high resolution aerial imagery can be used to determine processes and volumes of riverbank erosion at a catchment scale. Remotely sensed data captured before and after an extreme flood event, enabled a digital elevation model of difference (DoD) to be constructed for the channel and floodplain. This meant that: the spatial area that could be assessed was extensive; three-dimensional forms of bank failures could be mapped at a resolution that enabled process inference; and the volume and rates of different bank erosion processes over time could be assessed. A classification of riverbank mass failures, integrating form and process, identified a total of 437 mass failure polygons throughout the study area. These were interpreted as wet flow mass failures based on the presence of a well defined scarp wall and the absence of failed blocks on the failure floor. The failures appeared to be the result of: bank exfiltration, antecedent moisture conditions preceding the event, and the historic development of the channel. Using one-dimensional hydraulic modelling to delineate geomorphic features within the main boundary of the macrochannel, an estimated 1 466 322m2 of erosion was interpreted as fluvial entrainment, occurring across catchment areas from 30 to 1668 km2. Only 8% of the whole riverbank planform area was occupied by mass failures, whilst fluvial entrainment covered 33%. A third of the volume of material eroded came from mass failures, even though they occupied 19% of the eroded bank area. The availability of repeat LiDAR surveys, combined with high-resolution aerial photography, was very effective in erosion process determination and quantification at a large spatial scale

88 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used a wide grain size distribution with unconsolidated dam material to estimate the outflow hydrograph and the resulting inundation of a landslide dam that is breached due to overtopping failure.

66 citations

Journal ArticleDOI
TL;DR: A review of the use of polymers for soil stabilization in pavement and geotechnical engineering can be found in this paper, where the authors highlight the challenges for wider use of polymer stabilization of soils including limited evaluation standards, life-cycle cost considerations, and moisture susceptibility.

53 citations

Journal ArticleDOI
TL;DR: In this article, a series of unconsolidated undrained triaxial compression tests of fine-grained soil subjected to freeze-thaw cycles were conducted and the strength properties of the weak soil reinforced by fibers were analyzed.

51 citations