A METHOD FOR EVALUATING MEMBRANE COMPLIANCE AND SYSTEM COMPLIANCE IN UNDRAINED CYCLIC SHEAR TESTS

概要

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A method for evaluating system compliance and membrane compliance is proposed. Only changes in pore pressure and axial stress due to undrained cyclic loading at small shear strain amplitude are necessary to evaluate the value of system compliance ratio C_R. Pore pressure coefficient B-value is also necessary to calculate the value of membrane compliance ratio C_<RM>. These parameters can be obtained by nondestructive tests before destructive tests with large strain amplitude on soil specimens. The proposed method is applied to both reconstituted and undisturbed specimens. The test results imply that : (1) For reconstituted specimens, the values of normalized membrane penetration S calculated by C_<RM> indicate satisfactory consistency with other investigators' results. Therefore the values of C_<RM> can be successfully estimated by the proposed method. (2) A treatment for minimizing the unevenness of lateral surface of undisturbed specimens, has an effect of reducing the value of C_<RM>. (3) For undisturbed samples tested in this study, the values of C_R calculated by the method gave a consistent explanation of differences in pore pressure response characteristics of the specimens from the view of influence of the lateral surface treatment.
社団法人地盤工学会の論文
1991-09-15