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基于水布垭面板坝的现场大型承载试验成果,采用基于IGA的反演方法,研究了栖霞组灰岩、茅口组灰岩两种原级配筑坝堆石料的邓肯E–B模型参数。结果表明:在相同应力加载路径条件下,现场原级配堆石料比经过缩尺后的室内三轴试验试样具有更大的体积变形和更高的切线弹性模量,两者的力学性状存在较大差别。对栖霞组原级配灰岩堆石料的回弹模量参数反演分析得到K ur约为K值的2倍,而nu r远大于邓肯建议的直接引用加载时的弹性模量指数n值。宜加强现场原级配粗粒堆石料的力学性质研究,为超高堆石坝的建设提供更为可靠的理论依据。
Based on the large-scale on-site bearing test results of Shuibuya dam, the Duncan E-B model parameters of two kinds of primary graded rockfill materials for Qixia formation and Maokou formation limestone were studied by IGA-based inversion method. The results show that under the same stress loading path conditions, the original primary rockfill materials on the site have larger volume deformation and higher tangent elastic modulus than the ruptured three-axis test specimens, and the mechanical properties of the two exist Big difference. Inverse analysis of the springback parameters of the limestone rockfill material of the Qixia Formation shows that Kur is about twice as large as the K value, while nur is much larger than the value of the elastic modulus index nn when directly referenced to Duncan. It is necessary to strengthen the research on the mechanical properties of the raw graded coarse-graded rockfill materials on the site and provide a more reliable theoretical basis for the construction of the super-high dam.