阳江抽水蓄能电站上库大坝坝基岩体稳定性分析与评价

摘要

In order to appraise the upper reservoir main dam foundation rock stability for Yangjiang Pumped Stor⁃age Power Station, geological investigation was conducted by means of mapping, boring, adit, shaft, pit and geophysi⁃cal survey; then calculation and analysis were made by rigid limit equilibrium method and finite element method. The results demonstrate that the dam foundation stability against deep slide fulfill the requirements for dam con⁃struction. It is suggested consolidation grouting be adopted at the foundation faults after trough digging and at the po⁃sitions with rockmass of III-IV geological category, so as to improve the compression and deformation resistance ca⁃pacity of dam foundation rock.%　　为了评价阳江抽水蓄能电站上库大坝坝基岩体稳定性，利用地质测绘、钻探、平硐、竖井、坑槽探、物探等手段对大坝坝基进行勘察后，采用刚体极限平衡法及有限元法对坝基深层抗滑稳定进行计算及分析。结果表明：坝基岩体深层抗滑稳定性满足要求，具备成坝条件。建议：对坝基断层应槽挖后进行固结灌浆处理；对坝基岩体工程地质类别为Ⅲ-Ⅳ类的部位应做固结灌浆，以提高坝基岩体的抗压和抗变形能力。