综合加固处理技术在锦屏高拱坝左岸坝基中的应用

Comprehensive Reinforcement Technologies Applied to the Treatment of the Left Bank of Jinping High Arch Dam

锦屏一级水电站大坝基础地质条件复杂,尤其以左岸f5断层为代表的软弱岩体,断层规模大、岩体性状差,是影响拱坝渗流稳定、抗滑稳定和变形稳定最为关键的因素之一,因而f5断层处理效果的好坏直接决定了锦屏一级水电站高拱坝能否长期安全运营。为此,对锦屏一级水电站高拱坝左岸坝基范围内的f5断层处理技术进行了探索和研究,介绍了开挖置换、预应力锚固、高压固结灌浆、水泥-化学复合灌浆及高压水对穿冲洗回填砼等处理措施,并对处理效果进行了分析和评价。监测成果表明,以上综合加固处理措施达到了预期的效果,可为类似工程提供参考和借鉴。

The arch dam of Jinping first-stage hydropower station had complex geological conditions of dam founda- tion. Fault f5 in the left bank, a typical large-scale weak rock mass with poor rock properties, is a crucial factor af- fecting the dam＇ s seepage stability, anti-sliding stability and deformation stability. The reinforcement effect deter- mines directly whether the dam could work safely in the long run. In the present paper we explored and introduced the technologies of reinforcing the fault, including excavation-displacement, prestressed anchorage, high pressure consolidation grouting, cement-chemical compound grouting and the technique of ＂two-ended high pressure washing then backfilling with concrete＂. Also we analyzed and evaluated the reinforcement effect. Monitoring data suggest that these reinforcement measures have worked as expected, shortened construction period, saved cost, and com- pared with single measure, these comprehensive measures met the requirements of seepage stability, anti-sliding stability and deformation stability, and can be taken as references for similar engineering.