粗粒料大三轴试验研究进展

Development of study on a large scale triaxial test of coarse-grained materials

目前,粗粒料的抗剪强度与变形特性表达式是在砂土特性研究基础上修改而得到的。实质上,粗粒料具有粒径大、沉陷变形小及颗粒破碎明显等特性而与砂土相区别。因此,研究粗粒料工程特性与本构关系时应充分考虑这些固有特性。此外,粗粒料在高压、复杂应力状态及动荷载作用下的工程性质研究也有待加强。文中概括和总结了静力条件下粗粒料大三轴试验研究进展情况,包括抗剪强度、变形特性、本构模型及试验技术方面,并就其中的一些问题进行了讨论。

So far,the formulae of shear strength and deformation behaviors about coarse-grained materials are obtained from modification of constitutive models of sand.Actually,a coarse-grained material has the characteristics of big grain,small deformation and apparent particle breakage,which make it different from sand.So these properties have to be considered when studying its engineering characteristics and constitutive relation.And the research on its behaviors under the action of high pressure,complicated stress and dynamic load must be enhanced.On the basis of static large scale triaxial test,some advances of the research on coarse-grained materials are reviewed,including the shear strength,deformation behaviors,constitutive models and test technology.Additionally,some aspects of its engineering characteristics are also discussed.