锦屏一级大坝左岸建基面f2断层处理施工技术

锦屏一级大坝建基面地质条件复杂,断层及层间挤压错动带发育,其中规模较大、延伸较长的地质缺陷主要有f2,f5,f8等断层及煌斑岩脉,需采取刻槽置换、高压水冲洗、固结灌浆等工程措施进行处理,以满足拱坝基础承载力与抗渗稳定性要求。以锦屏一级大坝左岸建基面f2断层及层间挤压带地质缺陷处理为例,介绍了地质缺陷处理的原则和几种关键施工技术,可为类似工程坝基地质缺陷处理提供借鉴。

Treatment of f2 fault at left foundation surface of Jinping I arch dam

The geological conditions of foundation surface of Jinping I arch dam are very complicated, and faults and interlayer extrusion zone are developed. In particular, the f2,f5,f8 faults and lamprophyre vein are characterized as large scale and long ex-tension, which should be treated by measures such as grooving replacement, high pressure water washing, consolidation grouting, etc. to meet the requirements of arch dam foundation bearing capacity and anti-seepage stability. Taking the treatment of f2 fault and interlayer extrusion zone at left foundation surface as examples, the geological flaw treatment principles and several key construction techniques are introduced, which could provide references for the treatment of similar geological flaw.