FIELD COMPACTION TEST OF EMBANKMENT FILLED WITH SOIL-ROCK MIXTURES AND ITS COMPACTION MECHANISM

This paper illustrates a case study detecting roadbed quality of a highway embankment through its degree of compaction and the Benkelman Beam static deflection method. Based on field filling test, the paper examines the compaction mechanism of embankment filled with soil-rock mixtures, and the influence of different construction parameters(times of rolling, loose laying depth, grain composition, moisture content and mode of vibration) and their different combinations to compaction effect. The results indicate that:(1)As compaction effort increases, the deflection value of roadbed decreases at first and then stabilizes gradually, while the degree of compaction increases at first and then stabilizes gradually. (2)It will be a better degree of compaction for the roadbed by carrying out static pressure twice, high frequency vibration six times, 30 cm loose laying depth and sprinkling two or three times. (3)Particle breakage is one of the factors that increase the compactness of roadbed. As the coarse particles break into fine particles, which has filled the interstices and engaged for each other, the degree of compaction gradually increases. According to these test results, this paper establishes the Gaussian exponential relationship between the degree of compaction and modulus of resilience. It can provide a theoretical guidance for the highway embankment construction.