软岩路基当量回弹模量换算方法及应用OA

To address the difficulties in determining and controlling the resilient modulus at the top surface of soft rock subgrades,a conversion method for calculating the equivalent resilient modulus of soft rock subgrade top surface is proposed based on the two-layer plate theory and the principle of equivalent flexural stiffness,with verifying of deflection values of each layer in the pavement structure.This method takes the subgrade structure within the subgrade working zone as the conversion object,adopts the dynamic resilient modulus and thickness of each subgrade layer in the conversion structure as key variables,calculates the equivalent resilient modulus at the subgrade top surface through theoretical calculation,and validates the method by comparing deflection values before and after conversion.Relying on a domestic expressway project and focusing on the improvement design of mud-shale subgrade fill,a subgrade filling scheme is formulated using the proposed conversion method combined with the laboratory physical and mechanical test results of improved mud-shale filler,and is verified based on the field resilient deflection test data of the test section.The results show that the measured deflection values at the subgrade top surface meet the acceptance criteria,with a small deviation of only 2%from the calculated acceptance deflection values.The proposed conversion method can accurately calculate the equivalent resilient modulus at the top surface of soft rock subgrade,effectively control the subgrade top deflection in practical engineering,and guarantee the construction quality of subgrade filling.