江西地区重载铁路路基含水率原位监测试验研究  

Experimental Study on In-situ Monitoring of Water Content of Heavy Haul Railway Subgrade in Jiangxi Area

作　　者：朱江江 ZHU Jiangjiang(China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430063,China;School of Civil Engineering,Southwest Jiao tong University,Chengdu 610031,China)

机构地区：[1]中铁第四勘察设计院集团有限公司,武汉430063 [2]西南交通大学土木工程学院,成都610031

出　　处：《铁道标准设计》2021年第4期41-45,88,共6页Railway Standard Design

基　　金：国家重点基础研究发展计划项目(2013CB036204);中铁第四勘察设计院集团有限公司科技研究开发计划项目(2016K27-1)。

摘　　要：路基填料工程性质及含水状态直接影响线路长期服役性能。依托浩吉重载铁路工程建设,通过开展室内土工试验,分析填料的基本物性指标及不同含水状态下的力学性质;同时在路基试验段选取典型断面,分层埋设水分传感器,对路基不同深度处含水率进行了为期3年多的原位监测,研究江西地区路基含水率的时空分布特征。试验结果表明:饱和状态下填料力学性质较最优含水率时会弱化,对线路长期运营将产生不良影响;路基湿度与降雨具有良好的正相关性,随季节交替而起伏,波动范围为1.0%~2.2%;在水平方向,路基中部填料含水率小于两侧,两侧比中部高0.9%~2.6%,路基两侧含水率逐渐稳定甚至略微减小;在竖直方向,路基含水率呈上部小、下部大的基本规律,下部比上部高5.2%~7.4%。The engineering properties and moisture state of subgrade filling directly affect the long-term service performance of the line.Relying on the construction of Haolebaoji-Ji'an Heavy Haul Railway Project,the basic physical properties of the filler and its mechanical properties under different moisture state are analyzed through laboratory geotechnical tests.At the same time,a typical section is selected from the subgrade test section with water sensors embedded in layers.The water content at different depths of the subgrade is monitored in-situ for more than three years,and the temporal and spatial distribution characteristics of subgrade moisture content in Jiangxi area are studied.The research results show that,under saturated state,the mechanical properties of the filling tend to be weakened compared with that under optimal moisture content state,which results in adverse effects on the long-term operation of the line;there is a good positive correlation between subgrade humidity and rainfall,which fluctuates in the range of 1.0%~2.2% with the alternations of seasons;in the horizontal direction,the water content of the filling in the middle of the subgrade is less than that on both sides by 0.9%~2.6%,and the water content on both sides of the subgrade is gradually stabilized or even slightly decreased;in the vertical direction,the water content of subgrade in the upper part is smaller than that in the lower part by 5.2%~7.4%.

关 键 词：重载铁路 填料工程性质 水分传感器 原位监测 路基含水率 时空分布特征 

分 类 号：U213.1[交通运输工程—道路与铁道工程] U239.4