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碾压混凝土坝,由于其施工特点,存在着影响坝体渗流场的因素。例如美国柳溪坝因为层面结合不良而造成严重渗漏。日本采用常态混凝土防渗层包住碾压混凝土坝体,发挥了较好的防渗效果。本文探讨了影响大坝渗流的水平结合层面和常态混凝土防渗层的效果,以及增设坝内排水管的作用等问题。作者结合四川省铜街子工程的实际,应用有限元方法对碾压混凝土坝的平面渗流场进行了计算,认为:有了上游防渗层,碾压混凝土贯穿性层面对渗流场影响不大;上游防渗层应避免出现贯穿性开裂;而增设坝内排水管对坝内自由水面的降低比单纯加厚上游防渗层更为有效。
Because of its construction characteristics, there are some factors that affect the seepage field of dam body. For example, the United States Willow dam due to poor integration caused serious leakage. Japan used normal concrete impermeable layer wrapped RCC dam, play a good anti-seepage effect. In this paper, the effects of dam horizontal seepage and conventional concrete seepage prevention layer and the role of additional drainage pipes inside the dam are discussed. The authors calculate the plane seepage field of RCC dam by the finite element method based on the actual situation of Tongjiezi Project in Sichuan Province. It is concluded that there is little effect on the seepage field with the seepage - proof layer of upstream RCC layer. The upstream anti-seepage layer should avoid penetrative cracking; while the additional drainage pipe inside the dam reduces the free surface of the dam more effectively than simply thickening the upstream anti-seepage layer.