| 李闯,宋志强,王飞,刘云贺,王宗凯,宁致远.基于双模量动态本构模型的沥青混凝土心墙坝心墙响应特性研究[J].水利学报,2025,56(6):747-758,770 |
| 基于双模量动态本构模型的沥青混凝土心墙坝心墙响应特性研究 |
| Study on response characteristics of asphalt concrete core wall in dam based on bimodulus dynamic constitutive model |
| 投稿时间：2024-12-02 |
| DOI：10.13243/j.cnki.slxb.20240781 |
| 中文关键词: 双模量动态本构模型 水工沥青混凝土 等效应变率 心墙 地震响应 |
| 英文关键词: bi-modulus dynamic constitutive model hydraulic asphalt concrete equivalent strain rate core wall seismic response |
| 基金项目:国家自然科学基金重点项目（52039008）；陕西省自然科学基础研究计划项目（2022JM-276）；陕西省教育厅青年创新团队科研计划项目（22JP052） |
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| 中文摘要: |
| 适宜的动态本构模型是评估沥青混凝土心墙坝防渗心墙抗震性能的重要基础。单轴动态拉伸、压缩试验结果表明,水工沥青混凝土在低温动荷载下呈现拉、压弹性模量显著增大且差异明显的现象。本文以Ambartsumyan主应力空间双线性静态本构模型为基础,考虑拉、压泊松比的差异,依据主应力状态算得等效应变率,阐明了弹性模量确定、拉压状态判断与等效应变率计算三者之间的耦合关系,开发了增量迭代解耦数值分析算法,建立了水工沥青混凝土双模量动态本构模型。依据本文模型计算得到的拉、压应力应变曲线与试验结果吻合良好。基于所建的双模量动态本构模型开展了实际沥青混凝土心墙坝心墙响应特性研究,结果表明：地震荷载下心墙动态双模量效应明显,与动态双模量模型相比,单模量模型的最大动压应力偏小约71.4%,不同位置的峰值加速度相对差异最大可达25.78%。忽略沥青混凝土的动态双模量效应将导致心墙轴向和竖向拉应变分别增大45.8%、27.1%,会造成对心墙抗震能力的低估。 |
| 英文摘要: |
| An appropriate dynamic constitutive model serves as a crucial foundation for evaluating the seismic performance of the impervious core of asphalt concrete core dams. The results of uniaxial dynamic tension and compression tests indicate that under low-temperature dynamic loads, hydraulic asphalt concrete exhibits a significant increase in both tensile and compressive moduli, with a notable difference between them. Based on the Ambartsumyan bilinear static constitutive model in the principal stress space, this paper takes into account the differences in tensile and compressive Poisson’s ratios. The equivalent strain rate is calculated according to the principal stress state, thereby exploring the coupling relationship among the determination of modulus, the judgment of tensile-compressive state, and the calculation of equivalent strain rate. An incremental iterative decoupling numerical analysis algorithm is developed, and a dynamic bi-modulus constitutive model for hydraulic asphalt concrete is established. The calculated tensile and compressive stress-strain curves based on the constitutive model are in good agreement with the experimental results. Using the established dynamic bi-modulus constitutive model, a study on the response characteristics of the core of an actual asphalt concrete core dam is conducted. Under seismic loads, the dynamic bi-modulus effect of the core is evident. Compared with the dynamic bi-modulus model, the maximum dynamic compressive stress of the mono-modulus model is approximately 71.4% lower. The relative difference in peak acceleration at different positions can reach up to 25.78%. Ignoring the dynamic bi-modulus effect of asphalt concrete will lead to an increase in the axial and vertical tensile strains of the core by 45.8% and 27.1%, respectively, resulting in an underestimation of the core's seismic capacity. |
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