摘要
反拱水垫塘拱圈底板块稳定性是其在高水头和大流量作用下能否安全运用的关键技术之一。以溪洛渡拱坝下游出流条件和反拱水垫塘体型为参考,在拱圈底板块间止水破坏、底板块锚筋失效的极端条件下,对拱圈弹性底板块的振动特性进行了研究,得到拱圈底板块振动位移、速度和加速度幅值的沿程分布规律及其时域特性。研究表明,反拱水垫塘与平底水垫塘最大区别在于拱圈底板块能产生锁定,锁定高度受底板缝厚度控制,控制缝隙宽度对于反拱水垫塘的稳定起至关重要的作用。
The stability of the apron slabs on the arch ring of the inverted arch plunge pool is one of the key technologies to relate whether it can be safely operated under action of the high Water head and the large discharge. By referring to the inverted arch plunge pool and the surface outlet of Xiluodu arch dam as a prototype, an experimental research is conducted to the vibration characteristics of the elastic apron slabs on the arch ring under the conditions that the seal installation between the apron slabs and the anchor on slabs are all out of action. The distribution regularities of the amplitudes of vibrating displacement, velocity and acceleration of the slab and its characteristics of vibration in the time domain are obtained from the experiment. This experimental research proves that the significant difference between inverted and horizontal arch pool is that the slab on the arch ring can be locked and its height is under the control of the gap between the two slabs, it shows that the gap plays a crucial role in the stability of the invert arch pool.
出处
《水力发电学报》
EI
CSCD
北大核心
2008年第2期116-120,28,共6页
Journal of Hydroelectric Engineering
基金
国家自然基金项目(50279040)
关键词
水力学
高水头
大流量
反拱水垫塘
拱圈
底板块
振动特性
hydraulics
high water head
large discharge
inverted arch plunge pool
arch ring
bottom slab
vibration characteristics
