反拱水垫塘底板块破坏机理的试验研究

Experimental Research on the Destroy Theory of Single Slab in the Invert Arch Plunge Pool

在高水头、大流量作用下,在反拱水垫塘底板块止水设施完全破坏、锚筋完全失效的条件下,对底板块的振动位移与缝隙宽度的变化进行了试验研究,得出了两者之间的变化规律。在此基础上获得了拱圈底板块失稳的破坏机理,即底板块失稳是由于底板缝隙宽度增加的效应。因此,实际工程中,控制底板块的缝隙宽度是防止拱圈失稳的关键因素之一。

An experimental research is made on the destroy theory of a single slab in the invert arch cushion pool under the extreme conditions of completely damaged watertight seal and invalidated anchor rod and under the impact of large discharge from high water head in this article. The variation rules is ob- tained between displacement and clearance width of slab. On the basis of which the increase of gap width of slabs results in destabilization destroy of a slab can be obtained, that is, the destabilization of the bot- tom slab is due to the effect of increase in the gap width of bottom slab. Accordingly, controlling over the gap width of bottom slabs is one of the key factors in preventing the destabilization of arch rings in the actual engineering.