砂砾石材料回弹变形特性

砂砾石具有非线性的应力-应变特性,回弹模量是描述这一特性的有效参数,通过室内加大尺寸承载板试验能够得到较好的模拟砂砾石回弹模量的模型。分析了传统承载板试验测定砂砾石回弹变形特性的局限性和影响因素,并进行了试验仪器和方法的改进。以加大承载板试验数据为基础,拟合发现L-H模型能较好地反映砂砾石的非线性回弹变形特性,且模型中的回归参数与混合料的级配、含水量、压实度等因素具有关联性。并针对影响砂砾石回弹模量的两个重要参数:砂砾石黏土的掺配比和含水量进行了详细分析,并提出相应的工程建议。

Rebound Deformation Characteristics of Sand-Gravel Material

The sand-gravel materials have a nonlinear behavior and the resilient modulus can describe this character effectively.The resilient modulus model can be attained through augmented loading plate test.By analyzing the limitations and affecting factors of traditional loading plate test with measuring the rebound deformation characteristics of sand-gravel material,the experimentation apparatus and method are ameliorated.On the basis of the test data of augmented loading plate test,the fitting result shows that ...