TY  - JOUR
T1  - Geophysical Investigation of Road Failures in the Basement Complex Areas of Southwestern Nigeria
AU - , Michael Ilesanmi Oladapo AU - , Martins Olusola Olorunfemi AU - , John Sunday Ojo 
JO  - Research Journal of Applied Sciences
VL  - 3
IS  - 2
SP  - 103
EP  - 112
PY  - 2008
DA  - 2001/08/19
SN  - 1815-932x
DO  - rjasci.2008.103.112
UR  - https://makhillpublications.co/view-article.php?doi=rjasci.2008.103.112
KW  - Roadway
KW  -failure
KW  -resistivity
KW  -dipole-dipole
KW  -wenner
KW  -faults
AB  - Causes of failures on three roadways located in the Precambrian Crystalline Basement Complex area of Southwestern Nigeria have been investigated in this study. The electrical resistivity method involving dipole-dipole and Wenner Vertical Electrical Sounding (VES) techniques were utilized. The failed segments of the roadways are characterized by relatively low resistivity (mostly < 200  -m) with the stable zones typically resistive (>> 400  -m). Forms of road failures identified from the study are failures arising from differential settlement on road cut sections that intercept clayey saprolite with high moisture content as observed on Igbaraoke-Igbaraodo roadway; failures precipitated by differential settlements associated with significantly thick, low resistivity clay topsoil as observed on Itaogbolu portion of the Akure-Ado Ekiti roadway and failures initiated and sustained by geological features such as lithological contacts/faults, inclined interfaces between basement rocks and or collapse subsurface strata (e.g., cavity or sinkhole structure) as observed on study segment of Igbaraodo-Ikere Ekiti roadway. Pre-construction geophysical studies of roadways could effectively compliment routine geotechnical studies.
ER  -