堆石体分区和堆石料压缩模量对面板坝变形影响分析

An Analysis of CFRD Deformation under Different Zonings and Compression Modulus of Rock-fills

采用邓肯-张E-B模型和ANSYS数值分析软件,结合水布垭面板坝工程,研究了200 m级面板坝主、次堆石料不同压缩模量及堆石分区形式对坝体的沉降、应力和面板挠度等的影响。通过比较分析,结果表明：坝体最大沉降和面板最大挠度均随着主、次堆石压缩模量比值增大而增大;顶部面板顺坡向0.35倍处的面板挠度最大并有较大程度的反弯,为了减小挠度和反弯趋势,可增大主堆石料的压缩模量;主、次堆石压缩模量比值在1~2以内,可以选择分界线在坝轴线上游的分区形式,可以明显提高软岩的利用量而且坝体和面板的变形尚在接受范围之内;否则,分界线要置于坝轴线下游1∶0.2~1∶0.5之间,保证主堆石在0.5~0.75倍的充分坝宽,这样的分区对坝体和面板的变形才更为有利,值得推广应用。

Based on E-B model and ANSYS software,200 m dam settlement and stress and displacement（panel） deflection with different compression modulus and boundary positions are studied.The comparisons show that dam settlement and the maximum panel deflection increases as the ratio of compression modulus increases;0.35 times of the panel from the dam crest the maximum deflection and a high degree of recurvation exists,then increasing the compression modulus of primary rock-fill materials can reduce the deflection and recurvation relief against the trend;when the ratio of primary and secondary rock-fill compressibility is less than 2,the line at the upstream of the dam axis partition form is available that can significantly improve the utilization of soft rock and the deformation of the dam and the slab is still acceptable;otherwise,the line should be placed on 1∶0.2~1∶0.5 downstream of the dam axis to ensure the main rock-fill width 0.5 to 0.75 times of the full dam base,the deformation of the dam and the panel is more favorable and worth popularizing.