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针对全量型流变模型与加载应力路径无关,不能考虑施工或蓄水期在变应力作用下土石坝流变遗传特性的问题,基于继效理论,结合某工程堆石料的三轴流变试验资料,提出了适合于土石坝筑坝材料流变特性分析的7参数增量流变模型;利用试验各级增量荷载作用下的最终体积流变量与对应体积应力之间为近似线性关系,最终剪切流变量与对应的试验广义剪应力之间接近双曲线关系,整理得到其流变体积模量和剪切模量等模型参数;验证分析表明,建议的增量流变模型计算值与试验结果吻合较好,其可应用于实际土石坝的流变研究。
For the full-scale rheological model has nothing to do with the load-stress path, we can not consider the genetic characteristics of the earth-rock dam under the effect of stress during construction or storage period. Based on the theory of succession effect and the triaxial rheological test data , A 7-parameter incremental rheological model suitable for the analysis of the rheological properties of the earth-rock dam dam material is proposed. The final volume flow variable and the corresponding volume stress under the incremental load at all stages of the test are approximately linear and the final shear The relationship between the shear flow and the corresponding experimental generalized shear stress is close to the hyperbolic relationship, and the model parameters such as rheological bulk modulus and shear modulus are obtained. The analysis shows that the proposed incremental rheological model is in good agreement with the experimental results Good agreement, which can be applied to the actual earth and rock dam rheology.