一、从一座试验性拱坝的破坏谈起 几年前,在我国沿海一条小溪出口处,建造过一座试验性的砌石薄拱坝,最大坝高为22m,坝顶厚为1.0m,底厚为1.2m,为定圆心等半径圆筒型式,坝顶长64.35m,外半径为40m,中心角从顶到底变化在92°10′—32°40′之间,在坝顶中部设有长22m的溢流堰,堰顶低于坝顶0.7m(图1a)。为了试验,在坝身近基岩处设有一道周边缝,缝 First, from the destruction of a experimental arch dam A few years ago, in our coastal exit of a creek, built a pilot stone masonry dam, the maximum dam height of 22m, the top of the dam is 1.0m, Bottom thickness of 1.2m, for the center of a radius of the cylinder type, the crest length 64.35m, the outer radius of 40m, the central angle from top to bottom changes in the 92 ° 10’-32 ° 40 ’between the middle of the crest There is an overflow weir with a length of 22m, with a crest below 0.7m above the crest (Figure 1a). In order to test, near the bedrock at the dam with a peripheral seam, seam