梨园水电站下咱日堆积体稳定性分析

Stability analysis of Xiazanri deposits in the Liyuan Hydropower Station

结合工程地质勘察,研究位于梨园水电站坝前左岸的下咱日堆积体的工程地质特性和成因。应用极限分析能量法EMU程序,计算了4个典型剖面在不同工况下的安全系数。建立三维模型,通过FLAC程序得到的位移云图,分析该堆积体在天然、蓄水以及地震工况下的变形特性,并对Ⅲ号危险剖面用不平衡推力法进行了计算。计算分析结果表明,该堆积体整体稳定性较好,但存在局部滑动的可能。针对该堆积体的情况,提出了相应的防护、加固处理措施。

The Xiazanri deposits are located on the left bank of the Hyuan Hydropower Station. The geological characteristics and origin of the deposits have been studied based on field investigation. The EMU （energy method upperbound limit analysis） method is applied to calculate the safety factor of four typical sections of the slope under different conditions. The calculation results show that section Ⅲ is in danger of sliding. A 3-D model is established using FLAC software, and the deformation characteristics under natural, seismic and water storage conditions of the deposits are analyzed with displacement nephograms. The unbalanced thrust method is applied to the dangerous section Ⅲ for further study. Results show that the slope is in integrated stability, but there is a possibility of partial sliding failure. To enhance the security and stability of the slope, several corresponding measures are put forward.