摘要
土石坝数值模拟中,准确可靠的坝料力学参数是进行大坝变形预测,评价大坝安全性能的重要基础。基于泸定心墙堆石坝的变形监测资料,对大坝堆石料及心墙料流变参数进行了反演,并结合大坝实际填筑和蓄水过程进行了数值模拟,分析了大坝竣工和蓄水后的应力、变形及差异沉降。结果表明:基于反演参数的大坝应力、变形结果与实际情况拟合较好,竣工期与蓄水期的坝体沉降与主应力均在允许范围内;竣工期坝顶变形倾度均小于1%,蓄水期由于上游堆石料湿化变形导致坝顶区变形倾度增大;同时,坝顶轴线处变形倾度较上、下游侧整体偏大,且坝顶在河谷中间位置处变形倾度值最大,但未超过3%,即不会出现纵向裂缝,与实际情况相吻合。研究成果能较好地预测坝体应力、变形及裂缝情况,为大坝安全评价提供了重要的支撑。
In the numerical simulation of earth-rock dam,accurate and reliable mechanical parameters of dam material are the important basis for dam deformation prediction and dam safety evaluation.Based on the monitored deformation data of Luding core wall rockfill dam,the rheological parameters of rockfill and core wall materials are inversed in this paper.Combined with the actual filling and impoundment process of the dam,the numerical simulation is carried out,and the stress,deformation and differential settlement of the dam after completion and impoundment are analyzed.The results show that the obtained stress and deformation of the dam based on the inversed parameters are in good agreement with the actual situation,and the settlement and principal stress of the dam at the completion and during the impoundment period are within the allowable range.At the completion,the deformation inclination of the dam crest is less than 1%.During the impoundment period,the deformation inclination of the dam crest area increases due to the wetting deformation of the upstream rockfill material.Moreover,the deformation inclination of the dam crest axis is larger than that of the upstream and downstream sides,and the deformation inclination of the dam crest at the middle of the valley is the largest,but it does not exceed 3%,that means there would be no longitudinal cracks,which is consistent with the actual situation.The research results can well predict the stress,deformation and crack of the dam body,which provides important support for dam safety evaluation.
作者
覃浩军
王利杰
蒲国庆
叶坤
周雄雄
王刚
QIN Haojun;WANG Lijie;PU Guoqing;YE Kun;ZHOU Xiongxiong;WANG Gang(Sichuan Huadian Luding Hydropower Co.,Ltd.)
出处
《大坝与安全》
2025年第1期47-54,共8页
Dam & Safety
基金
国家自然科学基金青年项目(52209168)。
关键词
高心墙堆石坝
参数反演
有限元计算
变形倾度
裂缝
high core wall rockfill dam
parameter inversion
finite element calculation
deformation inclination
cracks
作者简介
覃浩军(1983-),男,广西象州人,高级工程师,主要从事水电站生产与科研管理工作。邮箱:545467181@qq.com。
