金峰水库沥青混凝土心墙堆石坝坝壳料流变及其湿化变形

Dam Shell Material Rheology and Wetting Deformation in Asphalt Concrete Core-Wall Rockfill Dam of Jinfeng Reservoir

金峰水库挡水坝坝型为沥青混凝土心墙堆石坝,最大坝高为88m。坝体从上游至下游分别为上游石渣料区、上游过渡料区,沥青混凝土心墙料区、下游过渡料区、下游竖向排水带、下游石渣料区及水平排水带。由于坝壳料采用全断面软岩~极软岩筑坝,软岩软化系数低,湿化和流变变形显著,如其变形过大,可能造成防渗体系变形过大,使得防渗体产生裂缝,从而影响其防渗性能及工程的安全运行。

Jinfeng Reservoir retaining dam type belongs to an asphalt concrete core-wall rockfill dam. The maximum dam height is 88m. The dam is divided into an upstream ballast material zone, upstream transition material zone, asphalt concrete core-wall material zone, downstream transition material zone, downstream vertical drainage belt, downstream ballast material zone and horizontal drainage belt respectively from upstream area to downstream area. Since whole-section soft rock - very soft rock is adopted as the dam shell material, soft rock softening coefficient is low, wetting and rheological deformation are significant, if the deformation is too big, it maybe possibly causing too large deformation of the impervious system. Cracks are produced in the impervious system, thereby affecting the anti-seepage performance and safe operation of the project.