非对称高面板堆石坝应力变形特点及改善对策

Deformation and stress characteristics of high asymmetric CFRD and for measures

给出了陡边坡、非对称、窄深河谷的量化定义,通过算例研究了陡边坡、非对称、窄深河谷上高混凝土面板堆石坝的应力与变形特点,由于左右岸非对称,堆石体存在不均匀沉降;受窄深河谷力拱效应的影响,堆石体的"后期沉降量"仍然较大;受陡边坡的影响,坡度较陡一侧(右岸)的混凝土面板的轴向位移及变形梯度均比另一侧的大。提出分区调整碾压参数,减小堆石体的不均匀沉降;充分加水碾压,减小堆石体的"后期沉降量";适当调整面板宽度及垂直缝宽度,以减小两岸边面板的拉应力和中间面板的挤压力等应对措施。

The stress and strain of high concrete face rockfill dam （CFRD） which was built on steep slope, asymmetric and narrow-deep river valley was studied. The results show that uneven settlement existed in rockfills because of asymmetric between left bank and right bank. Affected by the arch effect of narrow deep valley, later settlement value of rockfills was still great. Because of the effect of steep slope, the axi- al displacement of concrete panel and deformation gradient in the right （the bank more steep side） was larger than that of left. Finally, a series of improvement measures is proposed, such as adjusting the roller compaction parameters in different part of the rockfills to reduce the uneven settlement value, fully compact- ing the rockfills with water to reduce the later settlement value, appropriately adjusting concrete panel width and the vertical joint width to reduce tensile stress of side concrete panel and decrease extrusion pressure of the middle concrete panel