Arrangement structure of overflow surface holes of arch dam

Abstract

The invention discloses an arrangement structure of overflow surface holes of an arch dam. The arrangement structure comprises two middle piers arranged on the overflow surface of the arch dam at an interval, and two side piers arranged on the outer sides of the two middle piers at an interval respectively; each of an overflow middle hole and two overflow side holes consists an overflow section and an outlet section; the side walls of the side piers, positioned at the outlet sections of the overflow side holes are inclined for 4-5 degrees towards the corresponding middle lines of the side piers from the upstream to the downstream; the side walls of the two middle piers , positioned at the outlet section of the overflow middle hole, are inclined for 7-8 degrees towards the corresponding middle lines of the middle piers from the upstream to the downstream; and the overflow surface structure of each overflow side hole is as follows from the upstream to the downstream: the curve of a weir surface is a power curve, the upstream of the origin of the power curve is an elliptic curve, the power curve is tangent to a straight-line segment inclined downwards, and the lower end of the straight-line segment extends to the outlet tail end of the overflow side holes and is connected with a horizontal bucklet lip through an arc transition section. On the premise of meeting energy dissipation of outlets of the overflow surface holes of the arm dam, the arrangement structure can alleviate or avoid washout on a downstream side slope or sidewall.

Description

technical field [0001] The invention relates to a water-retaining arch dam in a water conservancy construction project, in particular to the layout structure of the overflow surface hole of the arch dam. Background technique [0002] In arch dam engineering, flood discharge from the dam body is the most economical flood discharge method, and this flood discharge method is mostly adopted for arch dams arranged on large rivers. At present, the flood discharge layout of the dam body is mostly "surface hole + deep hole" or "surface hole + middle hole + bottom hole". Energy dissipation method, however, when the riverbed is narrow, the energy dissipation method of surface pores spreading laterally will cause a certain degree of erosion on the bank slope of the downstream riverbed or the side wall of the pad pond under the dam. Contents of the invention [0003] The purpose of the present invention is to provide an arrangement structure of the overflow surface hole of an arch da...

AI Technical Summary

Problems solved by technology

At present, the flood discharge layout of the dam body is mostly "surface hole + deep hole" or "surface hole + middle hole + bottom hole". However, when the riverbed is narrow, the energy dissipation method of surface pores spreading horizontally will cause a certain degree of erosion on the bank slope of the downstream riverbed or the side wall of the pond under the dam

Images