某电站坝基固结灌浆效果评价与分析

大坝基础经固结灌浆处理后岩体的变形模量会有相当程度的提高 ,其值通常采用孔壁变模仪进行测试 ,并通过孔壁声波波速进行验证 ,但其测试值受到地质条件、裂隙发育、孔壁质量、测试方法等因素的影响 ,与岩体真实变模值存在一定的误差。本文从测试方法、灌浆过程等方面分析了某工程钻孔变模测试值偏低的原因,通过类比推证了在陡倾裂隙发育地层对穿声波波速和平板载荷模量相关性较好 ,更能反映地层岩体的整体变形模量 ,分析论证了在大规模灌浆处理后岩体的变模值将比灌浆试验时有相当程度的提高

Analyses of consolidation grouting of foundation of a hydropower station

The deformation modulus of dam foundation usually will increase greatly after grouting.Generally the hole deforming modulus method was used in tests and the hole acoustic velocity was used for verification.But there was difference between the real deformation modulus and the measured value because of a few influencing factors,such as geology condition,fissures,hole quality,testing method and so on.In this paper,the reason of the lower derorming modulus of drills in a project was analyzed which was caused by testing methods and grouting process.By using analyogism,results were obtained,showing that the correlation between deforming modulus of plate loading test and crossing hole acoustic velocity in the stratum with steep fissure was good.They were consistent with the overall deformation modulus of rock mass.It was proved that the mechanics performance of rock mass in grouting work project would be better than that in grouting test project.