猴子岩水电站上游硬岩堆石料爆破碾压试验研究

Experimental Study on Blasting and Compaction of Hard Rock as Upstream Rockfill Material of Houziyan Concrete Face Rockfill Dam

狭窄河谷高面板堆石坝减小堆石体孔隙率是降低坝体变形和拱效应的主要措施。变质灰岩硬岩堆石料爆破后粒形规整,细颗粒含量较小,碾压后孔隙率较大。为降低硬岩堆石料碾压后的孔隙率,对猴子岩水电站上游堆石区堆石料进行了爆破试验和碾压试验研究。通过多次试验,改进了爆破参数以改善颗粒级配组成;创造性地改造了振动碾参数,提出改造振动碾工况为低频高振,同时增加振幅,该方法解决了硬岩堆石料不易碾压密实的难题。

Reducing the porosity of rockfill body for high face rockfill dam in narrow valley is a major measure to reduce the deformation and arch effect of dam. The granular shape of metamorphic limestone hard rock is regular after blasting and the content of fine particle is smaller, so the porosity is higher after compaction. In order to reduce the porosity of hard rock rockfill material after compaction, the experimental studies on blasting and compaction of hard rock as upstream rockfill material of Houziyan Concrete Face Rockfill Dam are conducted out. Based on experiment results, the blasting parameters are optimized to improve particle gradation composition, and the parameters of vibrating roller are also creatively optimized. By transforming the vibration rolling condition into low-frequency and high-amplitude vibration, and increasing the amplitude of vibration, the problem that the hard rock rockfill material is not easy to be compacted is solved.