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Abstract Combined with mechanical experiment，ultrasonic wave testing is performed to investigate the quality and weathering status of rock specimens obtained in double borings situated in cliff of Grand Buddha of Jinyang in Taiyuan. In the study，the distribution laws of bulk density，dynamic parameters and static parameters of rock specimens in the direction of horizontal depth of the Buddha as well as numerical relationship between static and dynamic parameters are investigated. The results show that the distribution laws are identical，reflecting the diversification of weathering degrees of cliff rockmass in the direction of horizontal depth：in the direction of horizontal depth，the density of rockmass，saturated compression strength and static elastic module，dynamic elastic module and wave velocity present the current of increase with the depth increase. The weathering degree of rockmass ranging from the surface of cliff in depth of 2.5 m is highest，while the weathering degree of rockmass locating the position with depth larger that 3.0 m is weak. The rock specimens¢ quality exists distinct difference，which reflects the influences of lithology and unloaded rockmass. The relationships of dynamic elastic module，sonic wave velocity and horizontal depth，indicate that dynamic elastic module is more sensitive than sonic wave velocity. On the other hand，with the comparison between static elastic module and sonic wave velocity，it shows that the composition of rock has a great influence on the relationship between static and dynamic parameters，i.e. the diferent rock composition will lead to the dispersion and abnormity of the distribution of static and dynamic parameters.
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Received: 30 April 2007
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