粗粒料残余变形本构试验研究

Experimental research on constitutive relationship of residual deformation of coarse-grain materials

土石料的地震永久变形参数是土石坝抗震设计的重要参数。结合某水电站堆石坝工程,应用大型动三轴试验机对筑坝材料进行了动力残余变形特性研究。以沈珠江建议的方法为基础,通过整理不同工况、相同振次的试验数据,得到沈珠江模型参数。在沈珠江模型的基础上提出一种振次改进法,根据地震震级整理不同振次的模型参数,通过对比不同振次下粗粒料残余体应变和残余剪应变的模型计算值与实测值,证实了振次改进法的适应性。

Seismic permanent deformation parameter of earth and stone material is very important for seismic design of earth-rock dam.Combining a rockfill dam project of a hydropower station,we study the dynamic residual deformation characteristics of the construction materials by large dynamic triaxial apparatus.Based on SHEN-Zhujiang method,and by sorting out the experiment data of the same vibration times under different working conditions,we obtain the parameters of SHEN-Zhujiang model.We propose an improved method of vibration times on the basis of SHEN-Zhujiang model,which sorts out the model parameters according to earthquake magnitude.By comparing the calculation values of residual volume strain and shear strain with the measured ones,we verified the adaptability of this improved method.