Detection method for gravel-soil compactness detection index

The invention aims at providing a detection method for gravel-soil compactness detection index. An elastic modulus of a test piece is obtained through value test-piece calculation according to indoor compacted test-piece compression experiment data, and then gravel soil ratio is optimized. The top-surface equivalent rebound modulus of a road segment with good gravel-soil rolling combination effect in a test section is obtained, and a ratio of the top-surface equivalent rebound modulus to the indoor test-piece maximum elastic modulus is taken as the gravel-soil material parameter conversion coefficient of indoor and on-site working conditions, and a prediction equation of the top-surface equivalent rebound modulus of an on-site gravel-soil layer. A relational expression between the indoor sample top-surface vertical deformation and slag-soil roadbed on-site loading plate pre-estimated deflection or Benkelman beam pre-estimated deflection is obtained, and the ratio of the actual deflection to the pre-estimated deflection is the compactness detection index formula based on the loading plate or the Benkelman beam. The gravel-soil compactness can be rapidly determined through equipment for on-site Benkelman beam detection or loading plate detection and the like, the purpose of controlling construction quality is reached, and insufficiency of current relevant standards is made up.