摘要
了解水流特征、边坡结构和土质条件对边坡冲刷的影响及其破坏形式,是为盐渍土地区工程设计和施工防护提供科学依据的前提。结合室内试验方法,对盐渍土路基边坡冲刷工程进行模拟。结果表明:水流的冲刷致使路基边坡发生明显的变化,边坡坡脚首先受到水流的影响,其动态过程表征为水流浸泡冲刷—形成淘空槽—边坡上部土体掉落—冲刷深度范围扩大;随着流速、水深增加,坡脚冲刷程度增大,而坡比的影响恰恰相反;此外冲刷角的变化改变了最大冲刷深度出现的位置;相比于NaCl盐渍土路基边坡,Na 2SO 4盐渍土盐量的增加,坡脚处冲刷范围和最大冲刷深度出现呈现相反的减少趋势。
Understanding the influence of water flow characteristics,slope structure and soil condition factors on the degree of slope scour and the form of damage is a prerequisite for engineering design and construction protection in saline soil areas to provide a scientific basis.This paper adopts the indoor test method to simulate the slope scour engineering of saline soil roadbed.The results show that:the scouring of water causes obvious changes in the roadbed slope,the foot of the slope is first affected by the water flow,and its dynamic process is characterized as water soaking and scouring-the formation of the amalgamated trough-the upper part of the slope soil falls-the scouring depth range;with the increase of the flow rate and the depth of the water,the foot of the slope scouring increases,and the influence of the slope ratio is just the opposite;in addition to the changes in the angle of scouring changes the location of the maximum scouring depth;Compared with NaCl saline soil roadbed slopes,the increase of Na 2SO 4 saline soil salt amount,the scour extent and the maximum scour depth at the foot of the slope appeared to show the opposite trend of decreasing.
作者
江路路
高兴
杨舒月
JIANG Lulu;GAO Xing;YANG Shuyue(Huangda Railway Co.,Ltd.,Dongying,Shandong 257092,China;Beijing Jiaotong University,Beijing 100044,China)
出处
《黑龙江交通科技》
2024年第9期6-12,共7页
Communications Science and Technology Heilongjiang
基金
列车荷载作用下季冻区级配碎石填料冻融规律及劣化机制研究(中央高校基本科研业务费专项资金项目)(KCJBZY23003536)
交通荷载下路基变形特性(国家自然科学基金)。
关键词
盐渍土
边坡冲刷
水流特征
边坡结构
边坡土质类型
saline soils
slope scour
water flow characteristics
slope structure
slope soil types
