碎石材料振动压实特性的试验研究

为了准确描述碎石材料的压实状态,对碎石材料压实成型进行了动力学分析,并利用室内振动压实试验系统对碎石材料成型过程中碎石结构抗力的变化进行了测试.研究结果表明,碎石材料压实状态的变化可以用其结构抗力的变化来描述,而结构抗力的变化可以用压实机具加速度响应的变化来表征;压实过程中,碎石结构压实状态的变化是一个弹塑性变形交替出现的过程,其强度、刚度和稳定性是不断变化的,呈阶梯式上升.研究成果有助于碎石路基压实状态的现场判别.

Experimental Investigation on Vibrating Compaction Characteristic of Crashed Stone

A dynamic analysis of vibrating compacting of crashed stone was carried out,and structural resistance of crashed stone in the process of vibrating compacting was measured by utilizing a vibrating compaction test system in order to describe the compaction status of crashed stone accurately.The research results show that change of the compaction status of crashed stone can be described through variation of its structural resistance,while the latter can be expressed by the change in the acceleration response of compacting instrument.The vibrating compaction of crashed stone is a process,and in this process,elastic deformation and plastic deformation occur alternately.Furthermore,the strength,rigidity and stability of crashed stone,as a structure,increase in the form of steps in the whole process.The research result is helpful for the field judgment of compaction status of a crashed stone roadbed.