The Pavement Deformation Characteristics Of Study On Graded Crushed Stone Base

Rely on the projiect The Application Study on Graded Crushed Stone for CommonHighway Construction in Liaoning Provincce,due to the question that asphalt pavement may leadto appear reflective cracks by using semi.rigid base for its shrinkage,graded crushed shtone hasbeen concernd more these years.it is a loosening material with large plastic deformation,lowstiffness and low stress dispersion,it is doubted that this material can be used as the base.Thepaper conducts the system research on permanent deformation, Concrete research content asfollows:First of all,the paper review research methods and achievement of graded crushed stone athome and abroad. based on that the aggregate is up to related standard,through gradationdesign, rational gradation of dense framework graded crushed stone and continuous gradationgraded crushed stone is got and so is mixture ratio.Secondly, through repeated loads permanent deformation test of improved graded crushedstone specimen by using MTS810meterical test machine,the result turns out that permanentdeformation has influence by stress condition and gradation.Then the paper conducts simulation analysis for the graded crushed stone permanentdeformation by orthogonal test and ABAQUS finite element software, analyses the influence onpermanent deformation by changing the struetural parameters, in a comprehensive analysis,findwhich parameter influences permanent deformation the most and the ration structurescombination form.After a long.term observation of test roads which contains the test of deflection,crack andsmoothness, it proved that ration gradation could reduce permanent deformation and gradedcrushed stone base has remarkable effect on reflective crack control of asphalt pavement.