Permanent deformation behaviors of large-size graded crushed stone under rotational axial compressive loads
In order to study permanent deformation behaviors of large-size graded crushed stone under rotational axial compressive loads,the specimen preparation method of vibration and rotation compaction method is pro-posed based on the road materials vibration and rotation compaction device in this paper,and cyclic rotatory loading method is also applied to cyclic load on the preparation specimens.AASHTO and Monismith mathemati-cal model are used to couple the deformation data.The test results show that when the cyclic load is less than 200 kPa,the deformation of specimens will be eventually stable.When the cyclic load is more than 240 kPa and less than 320 kPa,the deformation of specimens will increase slowly and the increase rate will decrease.When the cyclic load is more than 360 kPa,the deformation of specimens will increase rapidly and the increase rate will keep high.The AASHTO mathematical model has better couple for the cumulative deformation under low-level cyclic loads.The Monismith mathematical model has better couple for the cumulative deformation un-der high-level cyclic loads.The cyclic load values and moisture content of specimens have certain regularity for the changes of the model couple parameters.
highway&railway engineeringlarge-size graded crushed stonecyclic rotatory loadpermanent deformationprediction model
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