Deep Foundations in Formations with Thick Layers of Intermediate Geomaterials and Deep Stable Strata

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AYO MEDUBI
AYO MEDUBI
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Medubi
Medubi
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A.
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Bankole
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G.M.
G.M.
α Kaduna Polytechnic Kaduna Polytechnic

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Deep Foundations in Formations with Thick Layers of Intermediate Geomaterials and Deep Stable Strata

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Abstract

This work entails the foundation studies, analysis and design that was conducted for a proposed development in the central area of the federal capital of Nigeria. The work encompasses extensive field work, experimental regime, laboratory testing and analyses of the deduced data. The work entails boring of twenty (20 Nos.) rotary drillings with rock coring as well as fifty (50 Nos.) mechanised percussion drilling with standard penetration tests (SPT). The latter gave refusal at between 8.15 and 9.65m while the rotary drilling depths were between 21 – 40m. These revealed sandy silt, silty sand, laterite, lateritic clay and concretionary laterite as the overburden material. Weathered and fresh basement rock were proved between 15 and 40m. Geophysical survey, by the use of vertical electrical sounding predicted weathered and fresh basement rock at varying depth of 18 -50m. The bearing capacity of the overburden material range from 28 – 400kN/m2 ( Factor of safety of 2.5) and >1000kN/m2 for fresh basement rock. 600mm and 900mm  bored and cased piles were recommended as foundation for the facility up to depth of 50m below the ground level. This is to take care of the depth to the stable strata resulting from the thickness of the intermediate geomaterial.

Funding

No external funding was declared for this work.

Conflict of Interest

The authors declare no conflict of interest.

Ethical Approval

No ethics committee approval was required for this article type.

Data Availability

Not applicable for this article.

How to Cite This Article

AYO MEDUBI. 2013. \u201cDeep Foundations in Formations with Thick Layers of Intermediate Geomaterials and Deep Stable Strata\u201d. Global Journal of Research in Engineering - E: Civil & Structural GJRE-E Volume 13 (GJRE Volume 13 Issue E8): .

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Journal Specifications

Crossref Journal DOI 10.17406/gjre

Print ISSN 0975-5861

e-ISSN 2249-4596

Version of record

v1.2

Issue date

December 27, 2013

Language
English
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This work entails the foundation studies, analysis and design that was conducted for a proposed development in the central area of the federal capital of Nigeria. The work encompasses extensive field work, experimental regime, laboratory testing and analyses of the deduced data. The work entails boring of twenty (20 Nos.) rotary drillings with rock coring as well as fifty (50 Nos.) mechanised percussion drilling with standard penetration tests (SPT). The latter gave refusal at between 8.15 and 9.65m while the rotary drilling depths were between 21 – 40m. These revealed sandy silt, silty sand, laterite, lateritic clay and concretionary laterite as the overburden material. Weathered and fresh basement rock were proved between 15 and 40m. Geophysical survey, by the use of vertical electrical sounding predicted weathered and fresh basement rock at varying depth of 18 -50m. The bearing capacity of the overburden material range from 28 – 400kN/m2 ( Factor of safety of 2.5) and >1000kN/m2 for fresh basement rock. 600mm and 900mm  bored and cased piles were recommended as foundation for the facility up to depth of 50m below the ground level. This is to take care of the depth to the stable strata resulting from the thickness of the intermediate geomaterial.

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Deep Foundations in Formations with Thick Layers of Intermediate Geomaterials and Deep Stable Strata

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