Variability of geotechnical parameters of lateritic gravels overlying contrasted metamorphic rocks in a tropical humid area (Cameroon): implications for road construction

Ze, Arnaud Ngo’o; Onana, Vincent Laurent; Mvindi, Aloys Thierry Ndzié; Ohandja, Hervé Nyassa; Eko, Robert Medjo; Ekodeck, Georges Emmanuel

doi:10.1007/s10064-019-01488-0

Cited by 18 publications

(8 citation statements)

References 21 publications

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“…The cost of study of the genesis of laterites by mineralogical and geochemical analysis limits the potential for prospecting, despite their intense use in constructions [1]. The laterites of the Congo Craton, which constitute 80% of this geological unit, in full industrial expansion, do not have detailed information on their mode of formation [2].…”

Section: Introductionmentioning

confidence: 99%

“…The study of laterization, which conditions the properties of this type of soil, is still of little interest because of its cost. However, the availability of a large database of geoelec-trical and geotechnical data from water drilling studies and road works, highlighting the physical and mechanical characteristics of the soils, can provide useful information for the interpretation of the laterization process [2].…”

Section: Introductionmentioning

confidence: 99%

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Laterization Process Recognition along the Northern Border of the Congo Craton by Geoelectrical and Geotechnical Data

Nkoungou¹,

Tsala

Oyoa

et al. 2023

International Journal of Geophysics

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With the properties of laterites being related to the nature of the rock from which they are derived, twenty vertical electrical surveys and twenty boreholes for geotechnical tests, distributed in two units (plutonic and green belt zones) of the Ntem complex located at the northern limit of the Congo Craton, were implemented to study the formation process of the laterites of this geological structure. The inversion of the geoelectrical data in the plutonic area resulted in three lateritic layers with resistivities of 1090 Ω·m, 1302 Ω·m, and 1122 Ω·m, with induration and leaching indices of 28.9% and 72.56%. In the green belt zone, three lateritic layers were also identified with resistivities of 1080 Ω·m, 943 Ω·m, and 1158 Ω·m, with induration and leaching indices of 28.8% and 72.55%. The similarities of the geomechanical parameters (induration and lixiviation indices) show that these soils experienced similar weathering patterns during the same geological period, confirmed by CBR values, corresponding to PF3 platforms that can be used in road works. However, the average resistivity values in the different geological units (1171.77 Ω·m and 1061.16 Ω·m in plutonic and green belt areas) reflect the observed differences in resistivity values of the bedrock alterations (3413.51 Ω·m and 1569.32 Ω·m in plutonic and green belt areas), showing that these laterites are derived from different bedrock weathering. In addition, the average permeability values obtained in the plutonic zone ( k = 6.24 E − 05 cm/s) and in the green belt zone ( k = 5.82 E − 05 cm/s) confirm this difference. The reduction in the difference between the resistivities of the laterites compared to the difference observed in the bedrock of the two units highlights the leaching process over a long geological period.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Laterization Process Recognition along the Northern Border of the Congo Craton by Geoelectrical and Geotechnical Data

Nkoungou¹,

Tsala

Oyoa

et al. 2023

International Journal of Geophysics

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“…Thus, lateritic gravels, lateritic cuirass, lateritic carapaces, and lateritic fines are encountered in Cameroon (Sikali and Mir-emérati 1986;Mbumbia et al 2000;Hyoumbi Tchumgouelieu et al 2018) and cover about 70% of the area of Cameroon (Sikali and Mir-emérati 1986). Previous work has been conducted by Manefouet (2016) on the weathering and geotechnical characterization of lateritic clays and gravels of the lower zone of the southern slope of the Bambouto mountains, by Sikali and Mir-emarati (1986); Ekodeck 1984;Nzabakurikiza et al (2012); Onana et al (2015); Takala and Mbessa (2018); Hyoumbi Tchungouelieu et al (2017), andNgo'o Ze et al (2019) on their use in road construction. Thus, depending on their geotechnical properties closely related to their origin (parent rocks), altitude, vegetation, and climate, they are used either as a base layer, sub-base layer, or as a subgrade layer (Sikali and Mir-emérati 1986).…”

Section: Introductionmentioning

confidence: 99%

Contribution of geoelectrical soundings and pedological wells to the estimation of the tonnage of lateritic gravels of the northern flank of Mount Bangou: implications for road construction

et al. 2022

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The increasing demands on lateritic gravels in road construction presently make it necessary to quantify the available resources that can be used in road construction. This study aims to estimate the tonnage and to valorize the lateritic gravels of the north flank of Mount Bangou (west Cameroon) in road construction. Interpretation of 48 vertical electrical soundings coupled with 20 pedological wells from five lateritic gravel sites was carried out to determine the thickness of the lateritic gravel level. The thickness of the lateritic gravel level obtained from the geoelectrical soundings is the greatest (8.88-12.45 m) compared to that obtained from the pedological wells (1.23-1.98 m), and thus shows the inadequacy of the pedological wells for the determination of the thickness of the lateritic gravels. Thus, the electrical resistivity method is appropriate to estimate the thickness of the lateritic gravel level. The lateritic gravels studied are characterized by the electrical resistivity curves of type K, HK, Q, QH, KQ, HKH, H, and KH. The medium-thick (8-36 m) and thick (13-44 m) zones are areas of high potential lateritic gravels. The proven reserves of lateritic gravels at the Chenye,

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“…Thus, lateritic gravels; lateritic breastplates; lateritic carapaces; and lateritic fines are encountered in Cameroon (Sikali and Mir Emérati, 1986;Mbumbia et al, 2000;Hyoumbi Tchumgouelieu et al, 2018) and cover about 70% of the area of Cameroon (Sikali and Mir Emérati, 1986). Previous work has been done by Manefouet (2016) on the alterological and geotechnical characterization of lateritic clays and gravels of the lower zone of the southern slope of the Bambouto Mountains, by Sikali and Mir-emarati, (1986);Ekodeck, 1984;Nzabakurikiza et al (2012); Onana et al (2015); Takala et al (2018);Hyoumbi Tchungouelieu et al (2017), Ngo'o Ze et al (2019 on their use in road technique. Thus, depending on their geotechnical properties closely related to their origins (parent rocks), altitude, vegetation and climate, they are used either as base layer, sub-base layer or as form layer (Sikali and Mir Emérati, 1986).…”

Section: Introductionmentioning

confidence: 99%

Contribution of Geo-electrical Soundings and Pedological Wells to the Estimation of the Tonnage of Laterite Gravels of the Northwestern Flank of Mount Bangou: Implication in Road Construction.

Tamba¹,

Kengni²,

Tixier³

et al. 2021

Preprint

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The increasing demands on lateritic gravels in road construction nowadays make it necessary to quantify the available resources that can be used in road construction. The aim of this study is to estimate the tonnage and to valorize the lateritic gravels of the North flank of Mount Bangou (West, Cameroon) in road construction. Interpretation of 48 vertical electrical soundings coupled with 20 pedological wells from 05 lateritic gravel sites was carried out to determine the thickness of the gravelly horizon. The thickness of the gravelly horizon obtained from the geo-electrical soundings is the highest (8.88 to 12.45 m) compared to that obtained from the pedological wells (1.23 to 1.98 m) and thus shows the inadequacy of the pedological wells for the determination of the thickness of the lateritic gravels. Thus, the electrical resistivity method is appropriate to estimate the thickness of the gravelly horizon. The lateritic gravels studied are characterized by the electrical resistivity curves of type K, HK, Q, QH, KQ, HKH, H and KH. The medium (8 to 36 m) and thick (13 to 44 m) zones are areas of high potential lateritic gravels. The proven reserves of lateritic gravels at the Chenye, Sekakouo, Bamendjou 1, Bamendjou 2 and Bangam sites are respectively 3479 003 t, 1 389 522 t, 5 002 505 t, 839 455 t and 2 663 105 t and can build respectively 539 298 m; 226 167 m; 131574 m; 778314 m and 401068 m of road, either as a form layer or sub-base.

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Variability of geotechnical parameters of lateritic gravels overlying contrasted metamorphic rocks in a tropical humid area (Cameroon): implications for road construction

Cited by 18 publications

References 21 publications

Laterization Process Recognition along the Northern Border of the Congo Craton by Geoelectrical and Geotechnical Data

Laterization Process Recognition along the Northern Border of the Congo Craton by Geoelectrical and Geotechnical Data

Contribution of geoelectrical soundings and pedological wells to the estimation of the tonnage of lateritic gravels of the northern flank of Mount Bangou: implications for road construction

Contribution of Geo-electrical Soundings and Pedological Wells to the Estimation of the Tonnage of Laterite Gravels of the Northwestern Flank of Mount Bangou: Implication in Road Construction.

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