反拱水垫塘拱圈破坏机理研究

Breakage Mechanism of Arch Ring in Inverted Arch Plunge Pool

为了揭示高水头和大流量作用下反拱水垫塘拱圈底板的破坏机理,采用物理模型试验研究的方法,结合溪洛渡拱坝表孔水舌作用下的反拱水垫塘,在拱圈底板块之间的止水设施破坏和底板锚筋失效的条件下,对拱圈多底板块的振动规律进行研究,得到拱圈底板块振动位移沿程及沿横向分布的规律、拱圈振动底板块数目与其振动位移的关系。结果表明:-2.0≤x/bm≤1.5为拱圈失稳破坏的危险区域,缝隙宽度的累加效应为拱圈发生失稳破坏的内在原因。

The objective of the research was to reveal the breakage mechanism of the apron slabs on the arch ring of the inverted arch plunge pool under the action of high water head and large discharge. Experimental research method was adopted to study the vibrating law of the elastic apron slabs upon condition that any seal installation between the apron slabs and the anchoring on slabs were all out of function in combination with the inverted arch plunge pool impacted by current from the dam of Xiluodu. The law for the vibrating displacement of the slabs along the path and the transverse distribution law were obtained and the relationship between the number of vibrating arch ring slabs and the vibrating displacement was identified. The research results showed that-2.0≤x/bm≤1.5 was a dangerous area for the instability and disfunction of the arch ring and the accumulative effect of the slit width was the internal cause for the breakage of the arch ring.