黏性土河床桥渡冲刷计算方法分析  

Analysis on Calculation Method for Bridge Crossing Scour of Cohesive Soil Riverbed

作　　者：李保龙[1] 孟军涛 杨维一 张佰战 LI Baolong1, MENG Juntao2, YANG Weiyi2,3, ZHANG Baizhan2(1.Shuohuang Railway Group Co. Ltd., Suning Hebei 062350, China;2.Railway Engineering Research Institute, China Academy of Railway Sciences Group Co. Ltd., Beijing 100081, China; 3.China Academy of Railway Sciences Group Co. Ltd., Beijing 100081, Chin)

机构地区：[1]朔黄铁路发展有限责任公司,河北肃宁062350 [2]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081 [3]中国铁道科学研究院集团有限公司,北京100081

出　　处：《铁道建筑》2018年第6期148-151,共4页Railway Engineering

摘　　要：河床桥渡冲刷计算首先应对河床土质进行分类,然后选用相应的公式。黏性土河床桥渡冲刷计算需要土的液限、塑限、液性指数等相关参数,这些参数对冲刷计算结果的准确性有很大影响。本文在阐述黏性土河床冲刷机理的基础上,结合朔黄铁路桥梁黏性土冲刷计算实例,对比分析了不同桥渡冲刷公式计算结果的差异,提出应结合相关实测资料进行论证,以提高黏性土冲刷计算结果的合理性和可靠性。While calculating the scour depth of a bridge crossing,f irstly the riverbed soil should be classified,then the corresponding formula should be selected according to the soil property.As for cohesive soil riverbed,the relative parameters such as liquid limit,plastic limit and liquidity index were needed.These parameters have great influence on calculation result accuracy. Based on scour mechanisms analysis of cohesive soil riverbed,and combining with calculation results of some bridges on Shuozhou-Huanghuagang Railway,the differences of scour depths obtained from different methods were analyzed and compared.The results show that the calculated scour depth of cohesive soil riverbed should be verified by relative measurement data to improve its reasonability and reliability.

关 键 词：桥渡水文 黏性土 河床 冲刷计算 一般冲刷 液限 塑限 液性指数 

分 类 号：U442.32[建筑科学—桥梁与隧道工程]