某电站溢洪道边坡运行期地下水渗流场特征数值模拟

NUMERICAL SIMULATION STUDY ON THE GROUNDWATER CHARACTERISTICS OF SEEPAGE FIELD ON THE SPILLWAY SLOPE AT A HYDROPOWER STATION

西南某电站位于岷江上游河段,水库蓄水后库水位将抬升130余米,改变了边坡地下水原有渗流场特征及其排泄补给条件,使地下水位以下岩体的物理力学性质产生一定程度的变化,并将由此产生的孔隙水压力叠加于边坡上,库水位的升降也将引起动水压力的变化,所有这些必然对溢洪道边坡长期稳定性产生一定程度的影响,因此研究边坡运行期间地下水渗流场特征具有重要意义。文章在大量现场调查和室内分析的基础上,利用三维数值模拟技术,对溢洪道边坡在蓄水前、蓄水后以及库水位骤降后的地下水渗流场特征展开了详细的分析研究,取得了较为科学、合理、可信的研究成果。

There is a hydropower station at the upper reaches of the Min}iang River. During the motion time, the reservoir＇s water level will rise aomost by 130 m, the groundwater seepage field characteristics and the condition of groundwater＇s supplies and drainage will change, and the physical and mechanical characteristics of the rock mass under the groundwater level will change, too. At the same time, the pore water press caused by the rise of groundwater will be put on the spillway slope. All of those actions will affect the slope＇s long-term stability to a certain extent, so its very important to study the slopes groundwater seepage field characteristics during the motion time. In this paper, the authors describe the slope＇s groundwater seepage field characteristics dhring the motion time deeply using the three--dimension numerical simulation method, and have obtained some scientific and reliable results.