摘要
采用三维有限元法,仿真模拟西南地区某碾压混凝土拱坝的裂缝成因。依据该拱坝施工过程和基本温控措施,充分考虑混凝土材料热力学性质随时间变化等因素的影响,拟定混凝土在碾压过程中的各种影响工况,如有无诱导缝、诱导缝等效强度大小为80%或60%、坝体表面保温的敏感性影响等,结合监测仪器的大量实测温度数据,经研究分析,施工现场复杂条件下的多方面因素综合作用,引起局部混凝土所受拉应力超过其极限抗拉强度,从而导致坝体裂缝的产生和发展,研究成果可为其他类似工程提供参考。
The causes of cracks in a RCC arch dam in Southwest China is analyzed with the three- dimensional finite element method.Based on large number of measured temperature data,elements including the actual dam construction process and the designed temperature control measures,the thermal stress of the dam are simulated and studiedwith the three- dimensional FEM. During the stress simulation,the thermal and mechanical properties of the concrete materials change over time and the conditions are simulated with or without the induced joint,when the equivalent strength of induced joint equals 80% or 60% of dam concrete and when surface heat preserves. And the actual temperature data has been studied. According to the research,the various factors in the construction of the dam contribute to the emergence and development of cracks. Thus,the cracks causes during the construction period are analyzed and the pulling press on the partial concrete surpasses its limit tensile strength. The research results can be reference for the similar projects,and the relevant measures can be taken during construction in order to avoid cracks.
出处
《人民珠江》
2016年第3期57-64,共8页
Pearl River
