河绠受力性质及其计算方法探讨

<正> 河绠是五十年代从苏联引入的一种木材水运收漂工程。由于我国的流送河道具有流速高、水深变幅大的特点,苏联的河绠受力计算方法及其提供的数据不能满足在我国流送河道上进行河绠工程设计的要求。笔者以原林业部中南林业设计院水工试验研究室进行的河绠受力计算方法水工模型试验研究资料为基础,从河绠水工模型试验理论和方法的角度,分析苏联中央木材水运科学研究所提供的两种河绠受力计算方法的特点和适应性,并对河绠受力的水力学本质提出新的认识。

A STUDY OF THE NATURE AND CALCULATING METHOD OF THE FORCES ACTING ON THE BOOM

In this paper, two formulas for calculating the forces acting on the boom put forward by Prof. L. E. Pashevsky and Master S. Y. Muchinic and their adaptability to conditions of high-speed flow and deep water are discussed.Based on theoretical researches and hydrotechnical experimens, this paper gives thepile of logs in the boom a new conception which regards the pile of logs as a floatingbody composed of floating units and characterized by its structure and shape. Onthe basis of the theory of hydrodynamic resistance, this paper also gives a newformula for calculating forces acting on the boom: P = A·b3·h3·V2·F(P).