Abstract
The authors have developed a data-base system for the physical and mechanical properties of rock and rock mass especially for the initial design of tunnels by NATM. The features of this data-base system are described and the capabilities of the system have been demonstrated. By processing the all data of the system, it has been found out that the physical and mechanical properties of intact rock and rock mass can be predicted in terms of longitudinal elastic wave velocity (Vp). On the basis of this finding emprical relations are suggested for the estimation of the properties of rock mass by using the insitu and field wave velocities and the properties of intact rock. Finally, a new proposal is made for the evaluation of properties of rock mass grade of the rock mass classification of Japan Roadway Association (JRA) in relation to the suggested formulas and wave velocities.
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