向家坝水电站左岸高边坡开挖与支护施工技术

Construction technology of excavation and supporting of high slope at left bank of Xiangjiaba Hydropower Station

向家坝水电站枢纽布置因受地形条件制约,需开挖左岸山体以满足二期导泄流建筑物、升船机上下游引航道布置条件。开挖后形成的高边坡地质条件复杂,且存在煤层采空区和煤洞,成为影响高边坡局部稳定的主要因素。为保证高边坡稳定及枢纽运行安全,需对其采取加固措施。经研究,高边坡处理采用了锚索、锚杆等常规支护措施,并对煤层采空区及煤洞进行了回填。处理后监测表明,左岸高边坡整体保持稳定状态。

The layout of hydro -complex of Xiangjiaba Hydropower Station is constrained by the topographic condition , the mountain body at left bank should be excavated for the layout of stage II diversion structure , upstream and lower stream approach channels of ship lift.The geological condition of the high slope formed by the excavation is complicated ;in addition, the mined-out area and coal holes exist , which are the main influential factors for the local safety of the slope .To ensure the stability of the high slope and the safety of the hydro -complex, reinforcement measures should be adopted .Through researches, the con-ventional support measures such as anchor cable and anchor rod are taken , and the mined-out area and coal holes are filled . The monitoring after the treatment shows that the high slope is in a stable state .