大河口水电站坝址岩体力学性质的试验研究

Experlmental Research on Characteristics of Rock Mechanics at Dam Site of Dahekou Hydropower Station

为研究大河口水电站推荐坝址基岩的变形特性和坝基抗滑稳定，在现场进行了岩体变形试验和混凝土与基岩及基岩本身的抗剪强度试验。基岩变形特性主要受到岩体内各结构面的影响，变形（弹性）模量值随厚层灰岩、薄层灰岩和断层破碎带的顺序递减。灰岩本身具有较高的抗剪强度。混凝土与灰岩的抗剪强度主要受混凝土与灰岩的胶结强度控制。因此，在坝基岩体不存在深层控制滑移面的情况下，混凝土与灰岩的接触面是主要的抗滑稳定控制面，最后提出了建议参数。

To analyze deformation characteristics of bed rock and stability against sliding of dam foundation at proposed dam site in Dahekou Hydropower Station,deformation test for rock mass and shearing test for con-crete and bed rock and had rock itself were conducted in site,Deformation features of bed are mainly affected by various discontinuities in rock.Deformation(elastic)module becomes less and less in turn of thick lime stone,thin limestone and zone of fault fracture. The shearing strength ofIIirnestone is higher.Shearing strength of concrete and limestone and limestone is mostly controlled by cementation strength for concrete and limestone. Therefore,if there is nocontrol sliding plane deep in the dam foundation rock,interface be tween concrete and liTnestone will be the main control plane against sliding.The proposed parameters are pre-sented.