断层蚀变带弱刻槽开挖与回填固结处理关键技术

Key technologies for excavation and backfill consolidation of weak grooves in fault-altered zones

为解决复杂地质条件下坝基开挖保护与处理问题,创新采用“小药量多分区弱刻槽开挖”的断层蚀变岩体开挖与回填混凝土、加强固结灌浆处理关键技术,通过工程应用和现场声波检测等数据分析评价开挖和固结处理措施的效果,实现了防止坝基岩体开挖松弛和保证岩体稳定、确保不良坝基满足高拱坝建基要求、避免断层发育岩体整体破坏等目标,具有重要理论意义和广阔的应用前景。

To solve the technical difficulties in excavation protection of dam foundation under complex geological conditions,technologies of excavating fault-altered rock mass-excavating weak grooves by a small amount of explosive charge each time and by multiple zones,backfilling with concrete,and consolidation grouting are innovatively adopted.The effects of excavation and consolidation treatment measures are evaluated by engineering application and on-site acoustic detection analysis to prevent relaxation of excavated dam foundation rock mass and to ensure rock mass stability.It can help ensure that the unfavorable dam foundation conditions can meet up with the requirements of a high arch dam foundation,and avoid the overall failure of rock mass due to fault conditions,which has important theoretical significance and broad application prospects.