卡拉贝利水利枢纽联合进水口进水塔群的布置及抗震设计

Lagout and Seismic design of intake tower group for joint-intake of Kalabeili Water Control Project

卡拉贝利水利枢纽进水口塔群设计面对高烈度地震频发、多泥沙、高水头运行等不利条件,通过对塔群设计遭遇的这些难题的分析认为,需从塔群布置、枢纽防沙、孔口尺寸和高程的确定及抗震设计等方面采取应对措施。因此提出了如下措施:设置高水头下的深式进水口,为确保水库运行安全,有条件时建议设置两条深孔泄洪洞;由于水库调节库容设计时已考虑水库运行50年泥沙淤积量,因此枢纽防沙主要是电站防沙,设计中通过抬高发电洞进口底板高程、前沿平齐布置等措施减少泥沙对机组磨损,同时制定合理的水沙调度方案使水库长期发挥效益;深式进水口各进口尺寸高程的确定需满足淹没深度、高水位泄洪、低水位排沙、导流度汛及放空等要求;综合分析考虑有限元和材料力学两种方法的计算结果,在回填混凝土顶面竖向应力较大处应增加竖向钢筋,以加强抗震措施。

The design of the intake tower group of Karabeili Water Control Project is faced with the unfavorable conditions,such as frequent high intensity earthquakes,heavy sediment-laden,high water head,etc. These problems encountered by the design of the intake tower are analyzed herein,and then the relevant methods and countermeasures are summarized from the aspects of the layout of the tower group,sediment control of the project,determination of the orifice size and elevation as well as seismic design,etc. it is proposed that if the condition is permitted,two deep-hole spillway tunnels are suggested to be arranged for the deep water intake,so as to ensure the safety of the reservoir operation. During the design of the regulating capacity of the reservoir,the sedimentation for 50 years is considered,while the project sediment control is mainly designed for the sediment control of the hydropower station,i. e. reducing the abrasion of the power generating unit from sediment through the measures of heightening the elevation of the bottom slab of the power tunnel inlet,flush-arranged the front edge as well as making reasonable watersediment operation scheme,so as to make the reservoir exert a long-term benefit. The determinations of the sizes of all the inlets for the deep intake are necessary to meet the requirements of the submerged depth,high water level flood discharge,low water level sediment release,water diversion and construction during flood season as well as emptying of reservoir. Under the comprehensive consideration of the calculation results from both the methods of finite element and material mechanics,additional vertical steel-reinforcement must be arranged at the top of the backfill concrete with larger vertical stress for strengthening the seismic measures concerned.