Abstract
Resilient modulus of subgrade has dependence to a certain extent on stress level for flexible pavement. Laboratory determination for resilient modulus commonly adopts repeated loading triaxial test at present in America or Europe. Stress level of subgrade need to be estimated firstly for confirmation on stress sequences before repeated loading triaxial test start. There is obvious difference between China and abroad in structural characteristics and engineering application of flexible pavement, which results in disparity for stress level of subgrade. A method of principal stresses of subgrade are obtained for 141 flexible pavement structures in more than twenty districts of China based on layered elasticity theory.
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