混凝土坝中排水孔排水幕的分析

借助于渗流场求解的结点虚流量法及能严密地模拟排水孔渗流行为的排水子结构技术、分别对碾压混凝土和常态混凝土重力坝中影响排水幕作用的主要参数排水孔孔距和孔径等进行了多种方案的对比分析。

Analysis of Influence of Drainage Curtain Composed of Drain Holes on Seepage in Concrete Dams

With the help of the numerical procedure of nodal virtual flux and the technique of drainage substructure for fixed mesh solution of seepage field with free seepage surface and drain holes, the authors have analysed the seepage behaviour of the fields in roller compacted concrete and conventional concrete gravity dams with the major parameters of center spacing and hole diameter. It is concluded that within the possible interval of the change of the diameter from 10 to 20 cm, the size of the hole diameter has only minor influence on the field. The determination of the center spacing may, however, be conducted under the constraint of the permissible magnitude of the uplift force in dam and the permissible elevation of the exit line of seepage surface on dam surface downstream. It is reasonable that the spacing are 3 to 4 m for conventional concrete dams and 5 to 6 m or even some more for roller compacted concrete dams.