某土石坝心墙料残余变形特性试验研究

Experimental Study on Characteristics of Residual Deformation of Core Materials of One Rockfill Dam

采用从英国GDS公司进口的电机控制动三轴试验系统,利用改进沈珠江模型对某水电站心墙堆石坝心墙筑坝材料进行了动残余变形特性的试验研究。试验表明:对天然混合土料而言,试样主要表现为剪切变形;材料的动力累积应变εv、εa和残余应变εvr、γr随着围压力σ3的增减而增减,动应变幅值也随着围压σ3的增加而增大;在相同条件下,随着固结比Kc的增加,材料的累积体应变和残余体应变均减少。

The experimental study on the characteristics of the dynamically residual deformation of the core materials for the rockfill dam of one hydropower project is performed by application of the electrically controlled dynamic triaxial test system imported from GDS, Great Britain and by utilization of the modified Shen Zhujiang Model as well. The test shows that, regarding the naturally mixed soil, the sample involves shear deformation. The dynamically accumulated strain （εv,ε） and the residual strain （εvt, γt） vary with the confining pressure （δ3 ）. The dynamic strain range increases with the increase of the confining pressure （δ3 ）. Under the same condi- tions, both strains of the accumulation and residue of the materials decrease with the increase of the consolidation ratio （Kc）.