梨园水电站运行期堆石体内水力学特征研究

Research on Hydraulic Characteristics of Rockfill in Liyuan Hydropower Station during Operation Period

运行期混凝土面板堆石坝堆石体内径流基本处于稳定状态,其水力特征主要受与之有一定联系的上游库水位变化的影响,在面板与下游防渗体系之间形成相对独立的小型水力系统,在以实测资料分析的基础上对梨园水电站堆石体内部水力特征进行了研究与探讨。梨园堆石体内坝轴线0+0下游侧堆石体内可按照一维稳定潜水流进行分析研究,上游侧渗点较多且比较分散,造成堆石体内径流有一定异常,但不影响堆石体内渗流稳定分析。堆石体内较大的孔隙率有利于地下水的排出,良好的堆石体填筑形成各向同性的均质透水层,大大降低甚至可以消除径流及水蚀对坝体稳定的影响。

The runoff in the rockfill body of the concrete face rockfill dam is basically in a stable state during operation period,and its hydraulic characteristics are mainly affected by the water level changes of the upstream reservoir which have some connection with it.A relatively independent small hydraulic system is formed between the panel and the downstream impervious system.Based on the analysis of measured data,the hydraulic characteristics inside the rockfill of Liyuan Hydropower Station are studied and discussed..The downstream side of dam axis 0+0 in Liyuan rockfill body can be analyzed and studied according to one-dimensional steady underflow.The upstream side seepage points are many and scattered,which causes abnormal runoff in the rockfill,but does not affect the stability analysis of seepage in the rockfill.Larger porosity in rockfill is conducive to the discharge of underground water.Good rockfill forms isotropic homogeneous permeable layer,which can greatly reduce or even eliminate the influence of runoff and water erosion on dam stability.