小颗粒石料护岸工程技术研究

根据散粒体颗粒的起动流速公式,计算分析小颗粒石料在不同水流与边界条件下的起动流速,并根据小颗粒石料护岸工程的水槽试验,结合下荆江熊家洲河段的卵石护岸试验工程,研究了小颗粒石料在长江中下游护岸工程中的可行性。结果表明,若小颗粒石料能满足水流抗冲条件,则采用小颗粒石料护岸是可行的,且有对近底水流干扰小与适应河床变形能力更强等明显优点;若将小颗粒石料与土工合成材料一起组成软体排,其抗冲能力增强,护岸效果更佳。研究成果可供护岸工程设计参考。

Study on the Technology of using small particle stones in bank protection works

The incipient velocities of small particle stones under different flow and boundary conditions are calculated and analyzed according to the incipient velocity formula of discrete particles.Based on the flume experiment of bank protection engineering on small particle stones and the experimental project of pebble bank protection in the Xiongjiazhou reach of lower Jingjiang River,the feasibility of using small particle stones in the bank protection works in the middle and lower Yangtze River were studied.The result shows that,when small particle stones satisfy the scour resistance request,the small particle stones have little influence on bottom flow structure and are much more adaptable to river bed evolution.If the small particle stones were used together with the geosynthetics to form the soft mattress,its bank protection effects would be even better.This research result can be referenced for the design of bank protection engineering.