| 摘要: |
| [目的]揭示反拱底板局部稳定和失稳破坏的机理.[方法]结合溪落渡水电站工程,制作了水垫塘精细物理模型,采用先进的模拟方法和测量手段,研究了在底板块止水完全破坏、锚筋失效,其四周及底部完全贯通的情况下,反拱水垫塘拱圈3个活动底板块的运动特性.[结果]反拱底板块振动的优势频率为0.001～0.1 Hz,沿程(x)划分为上下游强振区和冲击弱振区,在x=（－0.30～0.60）m底板块易失稳.[结论]底板块为低频窄带振动,不会发生共振破坏和材料的疲劳破坏.由于底板块形成了长期和局部拱作用,使拱圈保持稳定. |
| 关键词: 水垫塘 反拱底板 运动特性 位移 |
| DOI： |
| 分类号:F306.4 |
| 基金项目:国家自然科学基金项目 (50279040) |
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| Experimental research on the characteristics of the movement of three slabs in the invert arch plunge pool |
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SHAO Ke XU Xu-chu
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| Abstract: |
| 【Objective】 This research is designed to illustrate the partial stability and failure mechanism in the inverted arch slabs.【Method】 Fine physical models of plunge pool with regard to Xiluodu Water Power Station were made in these experiments.An experimental research on the characteristics of the movement of three unstable slabs in the invert arch plunge pool is made by adopting advanced simulation and measurement methods under the extreme conditions of completely damaged watertight seal and invalidated anchor rod and under the impact of large discharge from high water head.【Result】 The displacement distribution laws for the movement of the three slabs along longitudinal and lateral flowing path and its frequency extent characteristics are obtained. Invert arch slab vibrating frequency ranges from 0.001 Hz to 0.1Hz.The strong vibrating areas and impact strong vibrating areas are identified along the flowing path (x) in the upper stream and lower stream.The slabs are most likely to be unstable when located at x=(－0.30～0.60) m in the invert arch plunge pool.【Conclusion】 The experiments show that the slabs in the invert arch plunge pool vibrate with low frequency and narrowband.There is no damage caused by sympathetic vibration or fatigue of materials.The arch ring is kept stable by the arch formed in the slabs. |
| Key words: plunge pool invert arch slab dynamics displacement |
