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Abstract According to the established calculation formulae of geological strength index(GSI) and disturbed factor D for rock masses estimated by ultrasonic velocity of rock mass，the rock mass mechanical parameters are predicted by Hoek-Brown criterion based on ultrasonic velocity(the method of rock mass ultrasonic velocity for short). Then，taking Lancang River cross domain engineering slope rock mass of China—Myanmar oil and gas pipelines(domestic section) for example，based on the rock physico-mechanical parameters which were obtained by laboratory test and the wave test data，the rock mass mechanical parameters can be assessed according to the method of rock mass ultrasonic velocity and the Hoek-Brown criterion. It is shown that the calculation results of the method of rock mass ultrasonic velocity accords well with that of the method proposed by E. Hoek. The rationality of the method of rock mass ultrasonic velocity is further explained by numerical results. In addition，the proposed method provides a new approach to determine the mechanical parameters of rock mass，when test data are scant.
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Received: 14 November 2012
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2013, Vol. 32 
