Statistical analysis of characteristic physicochemical parameters and correlation of indices completely decomposed granite

The completely decomposed granite (CDG), which has close relations with geological disaster, is widely distributed in Southeastern China (esp. in Hong Kong). There are few researches on the statistical values and correlations of the physicochemical parameters. Based on analysis of 48 CDG specimens obtained from 3 trial pits at summits of 2 slopes in Hong Kong, this priper provided statistical values of physicochemical parameters from laboratory tests, and the correlation between surface area and cation exchange capacity. These results quantified the correlation among the physicochemical indices. Furthermore, the relationship between parameters of physicochemical property and mineral compositions was also analyzed. Actually these values are of potential importance to classification of granite weathering and prediction of their engineering geological characteristics.