锦屏一级水电站左岸1885m以上开挖工程边坡预应力锚索施工质量控制

锦屏一级水电站坝肩左岸边坡地质复杂,岩体内层面、层间挤压错动带、断层及节理裂隙发育;谷坡深部岩体内地应力高,浅表部岩体由于应力释放卸荷松弛强烈,且标段区内岸上坡深部存在深部裂缝,开挖后形成522m高的人工边坡,边坡稳定问题非常突出。施工中采用了大面积的单孔多锚头压力分散型无黏结预应力锚索深层支护、框格梁及锚喷混凝土浅层支护。通过一年多的工程实践,基本完成了EL1960m以上锚索施工。经过锚索测力计、测斜孔、多点变位计等监测表明,锚固后的开挖边坡是稳定的。

Jinping Hydropower Station Left Bank Slope Excavation Engineering 1885m Prestressed Anchor Cable Construction Supervision

Jinping left bank abutment slope complex geological conditions, rock mass level, inter-layer extrusion fault zone, faults and joints fractured; deep rock valley slope mainland high stress, superficial rock mass due to the stress relief unloading and relaxation intense and deep cracks in the presence of deep tenders shore slope area, 522m high after the formation of an artificial slope excavation, slope stability problem is very prominent. Construction uses a multi-hole pressure of a large area of the anchor head decentralized unbonded prestressed anchor deep pit, sash shotcrete concrete beams and shallow support. Through more than a year of engineering practice, basically completed EL1960m more anchor cable construction. After anchor dynamometer, inclinometerhole, multi-point displacement meter, monitoring data show that aRer anchoring the excavated slope is stable.