粘性土中桥墩基础局部冲刷计算方法对比分析

Analysis of the calculation methods of local scour depth around bridge pier in clays

桥墩基础局部冲刷研究多针对砂性土,相对于砂性土,粘性土的冲刷速度要慢得多,目前的研究较少地涉及到粘性土。近年来粘性土冲刷特性研究逐渐受到国内外学者的重视,粘性土中桥墩基础局部冲刷深度的计算方法主要有中国《公路工程水文勘测设计规范》方法(简称"中国公路规范方法")和美国SRICOS-EFA方法。本文通过典型算例的对比,分析了两种方法的计算结果及其各自特点。相比之下,中国公路规范方法的计算公式较为简单,但该方法仅能计算出桥墩基础的最大冲刷深度,并且忽略了一些重要的影响因素。本文通过典型算例的对比分析,对中国公路规范方法提出了一些改进建议。

Most of the current studies of local scour at piers are aimed at sandy soils. Comparison with sandy soils, the scour speed in cohesive soils is much slower. Only few researches are related to cohesive soils. Some researchers have paid attention to the scour behavior of clays. This paper mainly introduced the methods of pier scour in cohesive material. One the methods is the Hydrologic Reconnaissance Design Specification of Highway Construction in China, and the other is the SRICOS-EFA method used in USA. Characteristics of these methods are compared using some typical examples. The former calculation method is relatively simple. However, the method can only be used to calculate the maximum scour depth of the pier foundation, and it ignores the influence of some important factors. Some improvement suggestions are put forward through comparison analysis of some typical examples.