多石料场下面板堆石坝坝体的填料工程特性研究及稳定分析

Research on Engineering Characteristics and Stability Analysis of Filling Materials for Slab Rockfill Dam under Multi Quarry

上寨水库为新建水库,大坝通过多石料场下掺配上坝形式填筑完成,已蓄水并安全运行2 a多。该文以上寨水库为例,通过试验级配与密度、土工试验、室内渗透变形和反滤试验对多石料场下的面板堆石坝坝体填料特性进行了研究,通过试验取得成果参数对大坝进行了稳定计算分析。结果表明:多石料场下采用掺配形式上坝,能满足坝体各区对填料级配的要求,且坝体填料抗剪强度指标较高,通过坝体增设排水区和加厚下游干砌石护坡可增加大坝安全性,可为类似工程提供借鉴。

Shangzhai reservoir is a newly-built reservoir.The dam has been filled by mixing with the upper dam under the multi quarry.It has been impounded and operated safely for more than 2 years.Taking Shangzhai reservoir as an example,this paper studies the filling characteristics of concrete faced rockfill dam under multi quarry through test gradation and density,geotechnical test,indoor seepage deformation and inverted filtration test,and calculates and analyzes the stability of the dam through the test results and parameters.The results show that the mixing type on the dam under multi quarry can meet the requirements of filler gradation in all areas of the dam,and the shear strength index of the dam filler is high.The safety of the dam can be increased by adding drainage area and thickening the downstream dry masonry slope protection.This paper has certain reference and guiding significance for similar projects.