摘要
为研究堆石混凝土重力坝的力学特性和变性特征,依托贵州某水电站工程,对不同阶段、不同位置处的坝体温度和渗透压力进行监测。通过有限元软件,建立堆石混凝土重力坝仿真模型,同时考虑超载倍数的影响。结果表明,施工阶段的堆石混凝土绝热温升不高,通过控制混凝土入仓温度是控制施工阶段坝体温度的有效手段。在运营阶段,大坝靠近下游和上部的位置,温度受外部影响较大,呈现季节性变化规律。帷幕后的监测点渗透压力较小,显示出帷幕良好的止水效果。在超载倍数达到10时,坝顶位移达到42.3 mm,坝底位移达到15 mm左右,但仍未出现上下游贯通性的屈服破坏,这表现出该堆石混凝土水坝的整体安全性较高,其稳定性也较好。
In order to study the mechanical characteristics and degeneration characteristics of rockfill concrete gravity dam,this paper relies on a reservoir project in Guizhou to monitor the dam body temperature and seepage pressure at different stages and positions.Based on this,the simulation model of rockfill concrete gravity dam is established by finite element software,considering the influence of overload multiple.The results show that the adiabatic temperature rise of rockfill concrete in the construction stage is not high,so it is an effective means to control the temperature of dam body in the construction stage by controlling the temperature of concrete warehousing.In the operation stage,the temperature of the dam is near the downstream and the upper part,which is greatly influenced by the outside and presents a seasonal variation law.The seepage pressure of the monitoring point behind the curtain is small,which reflects the good water-stopping effect of the curtain.When the overload multiple reaches 10,the displacement of the dam top reaches 42.3 mm and the displacement of the dam bottom reaches about 15 mm,but there is still no yield failure of the upstream and downstream penetration,which shows that the overall safety and stability of the rockfill concrete dam are high.
作者
徐波
XU Bo(China Power Construction Hainan Construction Investment Co.Ltd.,Haikou 570100,China)
出处
《水利科技与经济》
2022年第11期21-25,共5页
Water Conservancy Science and Technology and Economy
关键词
混凝土重力坝
温度
渗透压力
超载倍数
concrete gravity dam
temperature
osmotic pressure
overload multiple
