ABSTRACT:

A great attention has been given to construct a number of descent roads, at the Kingdom of Saudi Arabia government development plans. Werka descent constructed two years ago and recently harmed due to rainstorm. Werka mountainous road subjected to rockfalls, manmade slope failures and debris flow along the road both sides. Intensive geotechnical study includes the RMR and GSI rock masses classifications were applied indicates that the rocks are medium to poor quality. The integrated techniques such as graphical method, modeling, and simulation are utilized to assess rock slope instability and rockfalls by using DIPS, RocFall, RocPlane and Swedge programs, on Werka descent road and recommend the remedial measures for the natural and manmade slope cuts and rockfalls. The seismic coefficients of 0.1 to 0.4 were taken into consideration in modeling. Two man-made slope cuts were studied and modeled utilizing the integrated techniques is to eliminate the risk of slope failures and rockfalls through the construction of remedial measures. The analyses indicate that the intensity of rainfall, joints set attitudes with the slope face attitude, Jv, block size; block shape, specific gravity, coefficients of restitution and the slope geometry are the main factors in rock slope failure and rockfall’s problems. The factors of safety of the slopes decrease as the seismic coefficients increase.

1. INTRODUCTION

The urbanization and development strategy of the government of the Kingdom of Saudi Arabia is basically grounded on the construction of modern roads and highway’s network. In addition, a great deal of attention has been given by the government to construct a number of descent roads, where road cuts and bridges across the valleys have been made. These descent roads connect the various parts of the Kingdom together; in addition to facilitate trading, transportation, tourism and security.

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