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裂缝是制约面板堆石坝推广的重要控制因素之一.针对可能导致面板出现裂缝的各种因素,结合江坪河面板堆石坝实际工程,建立包含面板、堆石体和岩基的三维数值分析模型,采用邓肯-张E-B模型模拟堆石体的应力应变关系,对竣工期与运行期的面板、周边缝的应力与变形展开研究,并对邓肯-张E-B模型中的关键控制材料参数进行了敏感性分析.结果表明:参数n、m对堆石体和面板的变形及应力影响较小,而Rf和k产生的影响较大.因此,堆石体选料应该级配合理,碾压应充分,保证坝体填筑均匀上升,加速竣工期沉降,减少蓄水后的变形量,避免蓄水后的堆石体和面板产生过大的沉降以及出现裂缝.
Crack is one of the important control factors restricting the popularization of the face rockfill dam.According to the various factors that may lead to the crack in the faceplate and combining with the actual project of Jiangpinghe Face Rockfill Dam, the three-dimensional numerical value including the face plate, rockfill body and rock foundation The Duncan-Chang EB model is used to simulate the stress-strain relationship of the rockfill body. The stress and deformation of the faceplate and perimeter joints during the construction and operation phases are studied. The critical control material parameters in the Duncan-Chang EB model The results show that the parameters n and m have little effect on the deformation and stress of the rockfill body and the panel, while the influence of Rf and k is greater, so the material of the rockfill body should be graded rationally, Should be sufficient to ensure that the dam body building uniform rise, accelerate the completion of the settlement, reduce the amount of deformation after storage, to avoid water after the rockfill body and panels have excessive settlement and cracks.