Abstract

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Title:: Study of Deformation Characteristics of Remoulded Soil at Airport High Fill Slope Under Different Proportions

Author(s):: ZHU Yan-peng; JIANG Huai-jun; YANG Xiao-hui; ZHU Jun-chuan; SHI Zhan-bin; Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology

Keywords:: high fill slope; silty clay; red sandstone; deformation characteristic; hyperbola function model; secant modulus

Abstract:: In order to study the compression characteristics of remoulded soil in an airport high fill slope under different proportions and the condition of optimum water, the compression test which contained 160 specimens in 40 groups was carried with compression apparatus, and the change rules of void ratio-vertical load curves of soils under lateral confinement condition were summarized.Through analyzing the relation between vertical pressure and vertical strain of remoulded soil, the optimum stress-strain curve formula was fitted, and the constitutive relation suit for the test soil was derived, at last the settlement was forecasted. The results show that the compressibility of remoulded soil with 20%(mass ratio) silty clay and 80% red sandstone is smaller than that of remoulded soil with 40% silty clay and 60% red sandstone, so the former is fit for high fill filler. The pressurestrain curves of remoulded soil under the condition of different mixture ratio and different compactnesses are all suit for hyperbolic function model. Compared to the standard recommendation method, the calculation values of settlement by secant modulus method are closer to measured values of settlement, and have better applicability.