Experimental study on long-term dynamic strength of gravel soil under traffic loading

Abstract In order to maintain the long-term dynamic stability of gravel soil subgrade under traffic loading and prevent fatigue damage, it is necessary determine strength different working conditions. The triaxial test was carried out on 40 groups remolded samples chosen 8 Based results test, εp-N curves εp-lgN were drawn. Further, σd-lgNf drawn, finally, computation model established. effects confining pressure, water content, degree compaction, frequency, initial static deviatory stress also analyzed. It concluded that With increase pressure compaction degree, increases. number cycles stress, decreases. At optimal highest. And impact frequency relatively small. relationship between 1 ×106，5 × 106 ×107 resilient modulus established, value curve coefficient ranges from 0.885 1.945.