تاثير مشخصات هندسي ناپيوستگي ها بر رفتار هيدروليكي و نشت آب از تكيه گاه هاي سنگي بتني قوسي

Evaluation of Geometrical Characteristics of Rock Joints on Hydraulic Behavior and Seepage through the Abutments of Concrete Arch Dams

Limitation of water flow and seepage from upstream to downstream through the abutments is a major factor in design of concrete arch dams. In practice, due to the intensive loading imposed on abutments, the concrete arch dams are usually constructed on the rocky abutments with high degrees of strength and stiffness. However, the hard rocks have always contained some discontinuities because of their intrinsic brittle manner. Since these discontinuities are the main ways through which most of seepage is occurred and thus tend to instability of foundation, their hydraulic and mechanical effects must be fully considered. In this paper the effects of geometrical parameters such as joints orientation and initial aperture are studied on hydraulic behavior and seepage through abutments. In addition, the effect of hydraulic initial aperture which is a hydraulic parameter is treated on the safety of abutments. The results show that the geometrical parameters have dominant influence on the seepage through abutments and can also endanger the stability of foundation.