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一、前言我国兴建的几座单支墩大头坝,在施工期间都出现过一些裂缝,在这些裂缝当中,以劈头裂缝(即上大头迎水面对称中心线附近的垂直裂缝,见图1-α)最多、最长,情况最为严重。例如,某地区的A~#坝,经多次调查统计,在上游面出现的垂直裂缝有103条,其中情况严重的有38条,而在这两项数字中,劈头裂缝分别占有50条和20条。从垂直裂缝的扩展情况来看,有半数以上穿过两个浇筑层,长度一般
I. INTRODUCTION In the construction of several single-piers dams constructed in our country, some cracks have appeared during the construction period. Among these cracks, fractures (ie vertical cracks near the center of symmetry of water surface) are shown in Figure 1-α ) The most, the longest, the most serious situation. For example, in the area of A ~ # dam, after several surveys and statistics, there are 103 vertical cracks in the upstream face, of which 38 are in serious condition. In these two figures, there are 50 vertical cracks and 20 articles. From the vertical expansion of the situation, more than half of the two through the pouring layer, the general length