雅鲁藏布江街需水电站巨型危岩体基本特征及防治措施

BASIC FEATURES AND PREVENTION MEASURES OF A GIANT UNSTABLE ROCK MASS AT JIEXU HYDROPOWER STATION,YARLUNG ZANGBO RIVER

高位危岩体对水电工程的施工安全和正常运营具有显著影响,尤其是规模较大且位于开挖线以外的大型危岩体,大型设备难以到达且加固难度较大,其治理方案对地质勘探提出更高要求。雅鲁藏布江上游河谷深切,边坡高陡,在街需水电站左坝肩发育一大型危岩体,约37.5万方,通过查明危岩体的赋存边界、连通状态、等效参数,采用定性和定量方法综合确定危岩体整体和局部稳定性、失稳方式,并提出了针对性的治理措施,这对巨型危岩评价思路和防治措施,具有一定指导意义。

Large dangerous rock mass located outside excavation line in hydropower project construction has a significant impact on its safety and operation. It?s difficult to reach and to reinforce them,and which put forward higher requirements to geological exploration. There are deep valley,high and steep slopes on the upstream of the Yarlu Zangbo River,and there is a large dangerous rock mass,about 37.5×104 m3,in the left dam abutment of Jiexu hydropower station. By finding out occurrence boundary of the rock mass,connected state,equivalent parameters,the qualitative and quantitative methods are used to determine the overall and local stability of dangerous rock mass,buckling mode,and the corresponding control measures are put forward. It has certain guiding significance to the giant dangerous rock evaluation idea and the prevention measures.