Abstract: Preestimate the intensity of rock-soil aggregate mixture quickly and accurately is not only helpful to design and calculate, but also to establish the construction scheme and choose properly compaction method, while the rock-soil aggregate mixture are broadly used in roadbeds, dykes and dams, and foundation engineering. The physico-mechanical character of the mixture are essentially determinated by the granule property of the mixture and the interior frame of the mixture, but the classification existed are always set about from the grain composition, it is hardly to predict the character of the mixture from the classification. Aimed at the engineering application, studied the classification method of the mixture supported by the results of lab shear test and compaction test, and utilized the nonlinear theory of fractal geometry, this article assorted the mixture into 3 levels and 24 kinds according to the property of rock and soil, the ratio of rock to soil and the granularity distribution fraction dimension of the mixture, to present the diversity on characters of different kinds of mixtures meanwhile. This synthetical classification method is prone to apply in practice for the criterion of this method is simple and it can be determined conveniently; and the representative strength of different kinds of mixtures could be quickly predict through this classification method.

Key words: rock-soil aggregate mixture, engineering classification, ratio of rock to soil, granularity distribution, fractal dimension