Geological Inputs in Road Design And Construction in Mountainous Areas of West Sabah, Malaysia
Writer : Felix Tongkul
Date : 20-23 Nov 2007
Publisher : Proceedings of 2nd Malaysia-Japan Symposium On Geohazards And Geoenvironmental Engineering
Location : Langkawi
Landslides frequently occur along major roads cutting across the mountainous areas of West Sabah. Not until recently, geological inputs were rarely sought when designing and constructing roads on mountainous areas. This paper highlights the important role played by geologists in assisting civil engineers in designing roads in unstable areas. To illustrate this point a detailed geological mapping project undertaken along the Ranau-Tambunan Road, underlain by the argillaceous Trusmadi Formation and arenaceous Crocker Formation, will be used as a case study. The geological mapping, carried out during the pre-construction stage, identified potential areas of slope instabilities, related to slope failures and embankment failures along the old Ranau-Tambunan road. By using available boreholes data, the lateral and vertical extent of these failures was determined. With this information appropriate slope designs for various segments of the Ranau-Tambunan road was successfully produced.