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Experimental Investigations in Nonlinear Elastic Behavior of Subgrade Soils under Traffic-Induced Loading
| 题名： | Experimental Investigations in Nonlinear Elastic Behavior of Subgrade Soils under Traffic-Induced Loading |
| 作者： | Li, J. |
| 关键词： | Roadbed base courses; Modulus of elasticity; Nonlinearity; Soil mechanics; Shear stress; Loads(Forces); Shear tests; Elastic properties; Stress strain relations; Triaxial stresses; Stress analysis; Resilience |
| 摘要： | This paper concerns experimental investigations of elastic nonlinearity of subgrade soils under vehicle-induced repeated loading. Two groups of soil samples (A8 and HA) were used to conduct triaxial shear tests with repeated loading. Investigations in this paper have included three aspects. First, a new nonlinear elastic model is introduced. In this model, shear modulus mu or resilient modulus M(sub r), is assumed to be a function of the recoverable strain and the number of repetition N. Second, the shear modulus mu or resilient modulus M, introduced in this paper not only allows one to study how shear and resilient modulus change with recoverable strain but also gives an opportunity to investigate effect of repetitions on the resilient modulus. An introduced function f(sub 1)(N) relates the shear modulus to the effect of repeated loading. Third, three constitutive parameters k(sub 1), k(sub 2), and k(sub 3) are calibrated through results gained from triaxial tests performed in the laboratory. A nonlinear relation between normalized deviatoric stress and recoverable strain is discussed. Effect of shear stress level on the elastic nonlinearity has been studied as well. |
| 总页数： | 42p |
| 报告类型： | 科技报告 |
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