EVALUATION OF DEFORMATION MODULUS OF SUBGRADE SOIL IN CONSIDERATION OF DRAINAGE CONDITION BY CYCLIC TRIAXIAL TEST COMBINED WITH BENDER ELEMENT TEST

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  • ベンダーエレメント併用繰返し三軸試験による路床土の排水条件を考慮した変形係数の評価

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<p> In the case of using natural ground as subgrade soil due to the restriction of road formation, complicated procedure of setting material model for pavement structure design is sometimes required in terms of physical conditions and sedimentary environment. Resilient modulus Mr is usually used for the evaluation of the deformation modulus as a design value in ordinary pavement design, but it is difficult to set a material model considering drainage conditions from the results of Mr-test carried out according to the standard of test method. For this reason, as an attempt to combine pavement engineering and geotechnical engineering, we developed a new testing method “CTX-BE test” by combining the cyclic triaxial test with the bender element test, the method of which are standardized by the Japanese Geotechnical Society. Based on a series of test results conducted on Toyoura sand, a new method for evaluate the deformation modulus and Poisson's ratio required for pavement structure analysis in consideration of drainage conditions of subgrade.</p>

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