摘要
水库蓄水和降雨入渗可导致土石坝发生显著的湿化变形,从而对坝体的应力变形性状产生重要的影响。合理的湿化变形模型和计算方法是模拟分析土石料浸水湿化变形特性的重要前提。论文基于三轴湿化试验研究成果,建议了一种新的堆石料湿化变形计算模型。该模型利用湿化变形方向的平行特性,采用堆石料本构模型计算相应的湿化体应变分量。新提出的模型仅需要一个湿化轴向应变模型参数。分别采用邓肯张EB和沈珠江双屈服面模型讨论了新湿化变形模型的具体计算模式,并通过与试验结果的对比验证了新模型的实用性。用改进的沈珠江三参数模型计算最终体应变和最终剪应变,湿化后的饱和流变规律与饱和试样的流变规律一致,湿化过程不会影响堆石料的饱和流变数值和规律。
The wetting deformation of rockfill materials, which usually results from reservoir impounding and rainfall infiltration, may greatly affect the overall stress-deformation characteristics of the dam. Both the reasonable model and computational method are important preconditions for calculating the wetting deformation when the earth-rockfill dam is wetted. A new numerical model for calculating the wetting deformation of rockfill materials is proposed based on a series of wetting triaxial tests in this paper. The new numerical model is derived from the parallelism of the wetting strain direction, and the volumetric strain can be calculated by the constitutive model of rockfill materials. The wetting axial strain is the only parameter for the new model. The formulas of this wetting deformation model are combined with CHANG’s EB model and SHEN’s double-yield-surface elasto-plastic model, respectively. The effectiveness of the new model is verified by the comparison of simulation and test results. The final volumetric strain and the final shear strain are fitted by the SHEN’s three-parameter model, and the results show that the characteristics of the creep strain of the saturated rockfill materials is similar to the rheological deformation after wetting, the influence of wetting on the characteristics of the creep strain can be ignored.
作者
丁艳辉
钱晓翔
DING Yanhui;QIAN Xiaoxiang(Beijing Institute of Water Conservancy Planning and Design,Beijing 100048,China;Beijing Rail and Transit Design&Research Institute Co.,Ltd.,Beijing 100068,China)
出处
《水利水电技术（中英文）》
北大核心
2022年第S01期455-462,共8页
Water Resources and Hydropower Engineering
关键词
堆石料
湿化变形
湿化模型
流变变形
本构模型
rockfill material
wetting deformation
wetting model
rheological deformation
constitutive model
作者简介
丁艳辉(1981-),女,高级工程师,博士,主要从事岩土工程等方面的科研工作。E-mail:15915292@qq.com
