大渡河某水电站大坝高线混凝土生产系统平台强卸荷边坡加固措施及效果

Reinforcing Measures and Effects on Strong Unloading Slope of Platform for Concrete Producing System at High Elevation for A Dam on Dadu River

大渡河某水电枢纽工程高线混凝土生产系统场区布设于大渡河左岸大坝下游约600 m处的马颈子山脊部位,地形上为一个三面临空的相对孤立山包,天然边坡风化、卸荷强烈。本混凝土生产系统所有设备将布设于场区开挖后形成的高、低两大平台上。为满足场区设备布置要求,高平台周边开挖后的人工边坡其坡体仍存在较厚的强风化、强卸荷岩体,加之边坡开挖坡比相对较陡,导致开挖后的边坡稳定性较差,本边坡工程采取了以浅层系统支护为主、辅以局部深层强支护相结合的加固措施,确保了设备基础边坡在使用期的安全稳定和有限变形要求。

The concrete producing system area at higher elevation for a hydropower project on the Dadu River is arranged at Majingzi mountain ridge,600 m downstream of dam,on left bank of the Dadu River. In topography,the ridge is an independent hill with three sides in air. Its natural slopes are weathered and unloading is strong. Equipment and facilities of the concrete producing system will be ar-ranged on two platforms excavated at different elevation. To satisfy requirements on equipment/facilities arrangement, the excavated slopes of the higher platform are supported in shallow layer primarily and local ＆ deep layer secondarily because the excavated slopes are with the thickly weathered and strong unloading rock mass as well as the excavated slopes are steep and their stability is weak accordingly. These support measures secure safety and stability of the slopes during their operation, and satisfy requirement on their limit deformation.