Abstract
Some applications of the geophysical logging for civil engineering are discussed as follows:
(1) Typical records of the intensity-log in the sonic logging which is an useful investigating method for cracks in bedrock and uniformity of geologic conditions are showed.
(2) It is considered that the formation resistivity factor is more effective data than the true resistivity for investigation on the quality of bedrock.
(3) The modulus of deformation of bedrock is estimated accurately by the multiple regression from the modulus of dynamic elasticity and R.Q.D..
(4) The principal component analysis are applied in the paper on 19 variates of the geophysical logging data and the other. 54% of the informations are represented by the first and the second components.
