论文部分内容阅读
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。
Gravel has nonlinear stress-strain characteristics. Resilient modulus is an effective parameter to describe this property. The model of simulating the modulus of elasticity of sand and gravel can be obtained by increasing the size of the load-bearing plate indoors. The limitations and influencing factors of the springback deformation of sand and gravel measured by the traditional bearing plate test were analyzed, and the improvement of the test equipment and methods was also carried out. On the basis of increasing the test data of the bearing plate, the LH model can be well fitted to reflect the nonlinear springback characteristics of sand and gravel, and the regression parameters in the model, such as gradation, water content, compaction Factors are related. Two important parameters affecting the modulus of resilience of sand and gravel, such as the mixing ratio and moisture content of sand and gravel clay, were analyzed in detail and corresponding engineering suggestions were put forward.