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室内三轴试验资料的分析表明:与砾石土心墙料不同,密实堆石料、砂砾料的破坏应力比,随围压的增长出现明显降低;而反映坝料剪胀特征的应力比,随着围压的增长基本不变。根据试验资料,建立了描述土石料剪胀状态和破坏状态的统一应力表达式;针对现有广义塑性模型不能合理反映土石料压缩性的问题,采用改进剪胀方程,利用室内压缩试验和三轴剪切试验成果,构造弹性和塑性模量,提出了一个可以考虑土石料复杂加载特性的实用的统一广义塑性本构模型;将上述模型编制程序,模拟土石料的试验加载,得到预测值与试验数据吻合良好,可较好反映筑坝土石料的应力变形特性。
The analysis of indoor triaxial test data shows that, different from the gravel core material, the failure stress ratio of dense rockfill material and gravel material obviously decreases with the increase of confining pressure. The stress ratio, which reflects the dilatancy characteristics of dam material, Confining pressure growth basically unchanged. According to the experimental data, a unified stress expression describing the dilatancy state and the failure state of the soil stone is established. In view of the fact that the generalized plasticity model can not reasonably reflect the compressibility of the soil stone, the improved dilatancy equation is adopted and the indoor compression test and triaxial Shear test results, the structure of elastic and plastic modulus, put forward a practical unified generalized plastic constitutive model can consider the complex loading characteristics of soil and stone; the above model preparation procedures, simulation of soil and stone loading test, prediction and test The data is in good agreement, which can well reflect the stress-deformation characteristics of the earth-rock dam.