Slope Failures and Remedial Measures for Strategic Highway Construction in Hilly Terrain
Dr. S.S. Seehra, Senior Consultant (Roads & Highways), LEA Associates South Asia Pvt. Ltd. (Former Director – Grade Scientist & Area Adviser, CSIR-CRRI, New Delhi)Introduction
Gravitational forces are always acting on a mass of soil or rock beneath a slope. As long as the strength of the mass is equal to or greater than the gravitational forces, the forces are in balance, the mass is in equilibrium and movement does not occur. An imbalance of forces results in slope failure and movement in the forms of creep, falls, slides, avalanches, or flows. Failure occurs when driving forces exceed resisting forces.Slope failures are a major issue for the highway safety and stability. Such slope failures as landslides are predominant in warm, humid climates and occur during years of unusually heavy precipitation or during period's of heavy concentration of rainfall or during wet years. However, prediction of landslip failure is often uncertain and slope stability is an important element depending upon slope geometry, inherent soil strength and ground or pore-water pressure characteristics.
The paper is related to the slope failure in the mountainous terrain where natural and manmade slope failures such as landslides or landslip usually occur.
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NBM&CW March 2012
