山区河流急流河段小桥孔径设计探讨

本文以明渠水流流态概念,从桥下水流图式,急流水流的物理性质,尤其是它对边界条件的敏感性等方面,分析了急流河段小桥采用“河床人工加固铺砌处理、压缩桥孔长度”的设计方式,可能出现的种种弊端。在此基础上,提出急流河段小桥孔径设计的一般原则。

Exploratory Investigation on Design of the Opening Diameter for Small Bridge Across the River of Rapid Flow in Mountain Area

In this paper by using the conception of state of flow in open channels, and from the flow diagram under the bridge and the physical properties of the rapid flow especially its sensitivity to boundary condi tions, so that probably may occur in thedesign for small bridge across the river of rapid flow by way of "artificial reinforced paving of the river bed treatment and shortening of the length of the bridge opening". Based upon this foundation, the general principles for the design of the opening diameter of small bridge across the river of rapid flow are presented here.