Location

Arlington, Virginia

Session Start Date

8-11-2008

Session End Date

8-16-2008

Abstract

A proposed 9.833-kilometer road to evacuate quarried limestone materials to a state cement factory near the city of Calabar in the south-south sub-region of Nigeria passes through a 130-meter wide Kwa River, six meters deep with one and half kilometers of swampy terrain on either sides. The right-of-way of the road on both sides of the river is composed of 1.00 meter thick brownish lateritic Sands and Silty Clays (SC) underlain by 2.00 meters of gravelly lateritic Sands (SW). Below these are indurated shales and limestone (SH/LST) that make up the Mfamosing limestone sequence. Borings made at both abutments of the 130-meter wide Kwa River indicated that 2.00 meters of Organic Silty Clays (OL), 4.00 meters of Well-graded Sands and Gravels (SW) and 6.00 meters of Sandy Silty Clays (SC) form the lithology at the left abutment of the proposed bridge across the Kwa River, while 1.00 meter of greyish Sandy Silty Clays (SC) and 5.00 meters of organic Silty Clays (OL) form the materials at the right abutment of the same bridge. These materials are all underlain by indurated Shale and Limestone to depths beyond 30.00 meters at both abutments of the bridge. Geotechnical engineering properties of the Sandy Silty Clays (SC), the organic Silty Clays (OL) as well as the well-graded Sands and Gravels that lie on top of the underlying Shale and Limestone indicate that lengths of piles that will bear the weight of the proposed bridge should be about 15.00 meters on the left abutment and about 10.00 meters on the right abutment. The paper describes in details, the lithology and engineering properties of the sub-grade materials at intervals of 0+500 meters along the entire length of the road as well as proffers the construction methods to be adopted in emplacing piles in the karst topography.

Department(s)

Civil, Architectural and Environmental Engineering

Appears In

International Conference on Case Histories in Geotechnical Engineering

Meeting Name

Sixth Conference

Publisher

Missouri University of Science and Technology

Publication Date

8-11-2008

Document Version

Final Version

Rights

© 2008 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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Aug 11th, 12:00 AM Aug 16th, 12:00 AM

Subsurface Geotechnical Engineering Investigations for a 9.833-Km Long Road and 130-Meter Wide Bridge in a Karst Topography in South-South Nigeria

Arlington, Virginia

A proposed 9.833-kilometer road to evacuate quarried limestone materials to a state cement factory near the city of Calabar in the south-south sub-region of Nigeria passes through a 130-meter wide Kwa River, six meters deep with one and half kilometers of swampy terrain on either sides. The right-of-way of the road on both sides of the river is composed of 1.00 meter thick brownish lateritic Sands and Silty Clays (SC) underlain by 2.00 meters of gravelly lateritic Sands (SW). Below these are indurated shales and limestone (SH/LST) that make up the Mfamosing limestone sequence. Borings made at both abutments of the 130-meter wide Kwa River indicated that 2.00 meters of Organic Silty Clays (OL), 4.00 meters of Well-graded Sands and Gravels (SW) and 6.00 meters of Sandy Silty Clays (SC) form the lithology at the left abutment of the proposed bridge across the Kwa River, while 1.00 meter of greyish Sandy Silty Clays (SC) and 5.00 meters of organic Silty Clays (OL) form the materials at the right abutment of the same bridge. These materials are all underlain by indurated Shale and Limestone to depths beyond 30.00 meters at both abutments of the bridge. Geotechnical engineering properties of the Sandy Silty Clays (SC), the organic Silty Clays (OL) as well as the well-graded Sands and Gravels that lie on top of the underlying Shale and Limestone indicate that lengths of piles that will bear the weight of the proposed bridge should be about 15.00 meters on the left abutment and about 10.00 meters on the right abutment. The paper describes in details, the lithology and engineering properties of the sub-grade materials at intervals of 0+500 meters along the entire length of the road as well as proffers the construction methods to be adopted in emplacing piles in the karst topography.