摘要
Abstract
Underground buried reinforced concrete tailwater bifurcations are commonly used in the pumped storage power stations,for the medium to high stress zone,attention should be paid to the stability of the surrounding rock during construction and the stress and strain of the lining during operation.This article takes the tailwater concrete bifurcations of a pumped storage power station as an example to analyze the stability of the surrounding rock during excavation and the stress and deformation of the lining under normal operating conditions.The reinforcement and crack width of the concrete lining are calculated.The analysis results show that the surrounding rock where the tailwater bifurcation pipe located is relatively hard.After excavation,the overall stability of the surrounding rock is good.Except for a certain plastic zone at the bifurcation,the distribution of plastic range in other parts is relatively small;Under the action of internal water pressure,the key areas of bifurcation design are the bifurcation and the transition from the main pipe to the branch pipe,especially at the bifurcation,where tensile stress is highly concentrated;The effect of internal water pressure improves the secondary stress field of the surrounding rock,which is beneficial for the stability of the surrounding rock.However,after internal water seepage in the lining of the bifurcation pipe,it is necessary to ensure that the third principal stress of the surrounding rock remains compressive stress.关键词
抽水蓄能电站/尾水钢筋混凝土岔管/初始地应力/衬砌配筋,裂缝宽度/水力劈裂Key words
pumped storage power station/tailwater reinforced concrete bifurcation pipe/initial ground stress/lining reinforcement/crack width/hydraulic fracturing分类
建筑与水利
