摘要
重力坝加高后会带来坝踵应力恶化、新老坝体结合面开裂及新混凝土表面裂缝等问题.针对兰溪桥重力坝加高工程自身特点,运用三维有限元方法,对加高后的温度、应力进行了精细化仿真计算分析.计算结果表明,加高后坝踵应力并未恶化;水库蓄水时,在坝体上游面短期内会产生较大拉应力;新老坝体结合面应力主要是法向正应力和沿坝坡方向的切应力;新浇坝体在采取适当温控措施后可以满足防裂要求.综合各方面考虑,兰溪桥重力坝常态混凝土加高方案是可行的.
After the gravity dam heightening, the dam heel stress deteriorated, the new and old dam bodies bonding surface cracking and the new concrete surface cracks will be generated. Based on the characteristics of Lanxiqiao Gravity Dam heightening project, the temperature and stress of Lanxiqiao Gravity Dam after heightening is simulated and analyzed by using 3D finite element simulation method. The calculation results show that the stress of the dam heel had not deteriorated after heightening. After reservoir impoundment, great tensile stress occurred in the upper surface of dam for a short time. Stress on the bonding surface of old and new dam bodies mainly normal stress and vertical axial shear stress. The new dam body can meet the re- quirement of crack prevention after taking proper temperature control measures. In summary, the normal concrete heightening scheme of Lanxiqiao gravity dam is feasible.
作者
张南南
虞鸿
Zhang Nannan, Yu Hong(Zhejiang Provincial Institute of Water Conservancy Hydropower, Hangzhou 310002, Chin)
出处
《三峡大学学报（自然科学版）》
CAS
北大核心
2018年第2期6-10,共5页
Journal of China Three Gorges University：Natural Sciences
基金
浙江省水利水电勘测设计院科标业项目(B1506)
关键词
混凝土重力坝
加高
有限元法
坝体应力
新老坝体结合面
温度控制
concrete gravity dam
heightening
finite element method
dam stress
bonding surface ofold and new dam bodies
temperature control
