水力发电2024，Vol.50Issue(12)：59-64,77,7.
加高重力坝改善坝踵应力及抗滑稳定性的施工措施研究
Research on Construction Measures for Improving Dam Heel Stress and Anti-sliding Stability of Heightened Gravity Dam
摘要
Abstract
Dam heightening is one of the main means to realize the capacity expansion and efficiency increase of constructed reservoirs.However,lower design standards of the original project may result in difficulties in meeting the design requirements for the stress and stability of the dam body after heightening.Combined with a actual project,the pouring sequence to reduce the tensile stress of dam heel and the staggered pouring method of the new and old dam body to improve the anti-sliding stability are studied by using the theory of material mechanics,and the conclusions of the material mechanics method are verified by using finite element software ABAQUS.The calculation results show that the staged heightening makes the old dam heel stress deteriorate,and the vertical tensile stress in new dam heel is larger than that of the one-time dam construction,which is unfavorable to dam heel stress.In this project,when the dam concrete block is poured within 1/3 dam height on the downstream side,the vertical compressive stress of the upstream dam heel will be weakened,so early pouring of this part of concrete can effectively reduce the tensile stress of dam heel.The safety factor of anti-sliding stability of the new and old dams with staggered pouring is 2%-5%higher than that without staggered pouring,the preferential use of staggered layer pouring on the front side of the heightened gravity dam can effectively improve the anti-sliding stability of dam body and reduce the plastic strain of dam body.关键词
重力坝/分期加高/浇筑顺序/坝踵应力/错层浇筑/抗滑稳定性Key words
gravity dam/staged heightening/pouring sequence/dam heel stress/staggered layer pouring/anti-sliding stability分类
建筑与水利引用本文复制引用
李嘉翔,张海峰,刘航,王建..加高重力坝改善坝踵应力及抗滑稳定性的施工措施研究[J].水力发电,2024,50(12):59-64,77,7.基金项目
国家自然科学基金资助项目(52279099) （52279099）
