1. Research Assistant, Institute of Soil Mechanics and Foundation Engineering, Faculty of Architecture, Town and Environmental Planning, Civil Engineering, Univ. of Kaiserslautern, 67663 Kaiserslautern, FR Germany.
2. Professor Dr.-Ing., Institute of Soil Mechanics and Foundation Engineering, Faculty of Architecture, Town and Environmental Planning, Civil Engineering, P.O. Box 3049, Univ. of Kaiserslautern, 67653 Kaiserslautern, FR Germany.