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给出了新的河谷形状参数定义,采用河谷宽度系数μ、河谷边坡陡缓系数δ、河谷非对称系数γ三个动态参数来描述河谷形状。研究了新给出的河谷形状参数对面板堆石坝变形特性的影响,研究表明:河谷地形对坝体存在约束作用,河谷宽度系数越小,河谷地形对坝体的约束作用越强;河谷地形对坝体的约束作用减小了面板的挠度,而堆石体内部存在的应力拱效应则增大了坝体的后期沉降量,两者的共同作用是导致窄河谷中面板产生裂缝的主要原因;河谷边坡陡缓系数不同,堆石体内部潜在剪切滑动面的位置不同,面板的重点防护范围不同;河谷非对称系数越大,大坝发生不均匀沉降的范围越大,面板的扭曲变形越大。
The definition of the shape parameters of the river valley is given. The shape of the river valley is described by three dynamic parameters of river valley width μ, river valley slope δ, valley asymmetry γ. The effect of valley shape parameters on the deformation characteristics of concrete faced rockfill dam is studied. The results show that: the river valley topography restrains the dam; the smaller the valley width coefficient, the stronger the constraint of the river valley to the dam body; The restraint on the dam reduces the deflection of the panel, while the stress arch effect existing inside the rockfill body increases the late settlement of the dam body. The combined action of the two is the main reason that causes the crack in the panel of the narrow valley ; The steepness coefficient of the valley slope is different, the potential shearing sliding surface position inside the rockfill body is different, and the protection range of the panel is different; the larger the river valley asymmetry coefficient is, the bigger the range of the uneven settlement of the dam is, the distortion of the panel Larger deformation.