长河坝水电站1^#初期导流洞进口高边坡稳定分析

Stability analysis on high slope at inlet of No.1 diversion tunnel for initial stage of construction of Changheba Hydropower Station

文中对长河坝水电站1#初期导流洞进口高边坡稳定进行了分析,分析采用ANSYS软件,运用三维非线性有限元法模拟了相关各岩层、断层的结构和性能,计算了全断面开挖未支护工况、开挖过程与支护工况、正常蓄水位工况和水位骤降工况下的应力状态,并通过初始地应力场计算、开挖作用下边坡变形应力计算、运行期水位骤降情况变形应力计算,综合评价了该边坡的整体稳定性,提出了合理的加固支护建议。

The Stability analysis on the high slope at the inlet of the No. 1 diversion tunnel for the initial stage of the construction of Changheba Hydropower Station is made herein ; in which the structures and the characteristics of the relevant rock layers and faults are simulated with 3-D nonlinear finite element method based on ANSYS, and then the unsupported condition of the full-face excavation and the stress status under both the normal water level and the sudden drawdown of water level are calculated, furthermore, the overall stability of the slope is comprehensively evaluated through the calculations made on the initial ground stress field, the deformation stress of the slope under the excavation and the deformation stress under the sudden drawn- down of water level during the operation period. Finally, some reasonable recommendations for the reinforced supporting are put forward as well.