软岩筑沥青混凝土心墙坝流变特性研究

Rheological deformation analysis of asphalt concrete core dam constructed with soft rock material

与硬岩料相比,软岩堆石料具有明显的流变变形特性。基于长江科学院提出的九参数流变模型,采用有限元数值分析方法,以驮英水库软岩筑沥青混凝土心墙堆石坝工程为例,研究了软岩堆石料流变特性对大坝应力变形的影响。计算结果表明:本工程沥青混凝土心墙坝运行至稳定需3年时间,坝体运行期最大沉降为0.81 m,约占坝高的1.12%,位于大坝的中部高程处,符合以往软岩筑坝的变形实测规律。由此可知,软岩料具有明显的流变变形特性,应在计算分析中合理考虑其影响。

Compared with hard rock materials,soft rock is a kind of filling material with obvious rheological deformation properties.Based on the rheological deformation model proposed by Changjiang River Scientific Research Institute,the influence of rheological deformation on stress and deformation of the asphalt concrete core dam of Tuoying Reservoir filled with soft rock materials was studied by finite element method.The results of study demonstrate it will take 3 years for the asphalt concrete core dam of Tuoying Project to become stable after it is put into operation,with the maximum settlement of 0.81m,about 1.12% of the dam height,occurring in the middle of the dam,which is conformity with the monitoring data of dam constructed with soft rock material.It is concluded the rheological deformation properties of the soft rock materials should be taken into account during calculation and analysis.