基于盐胀控制的路用硫酸盐渍土评价方法研究  

RESEARCH ON EVALUATION METHOD OF ROAD USE SULFATE SALINE SOIL BASED ON HIGH SALT EXPANSION CONTROL

作　　者：牛玉川 吴亚平[1] 王茂靖[2] 于天佑 杨芊 薛鹏 李海龙[1] NIU Yu-chuan;WU Ya-ping;WANG Mao-jing;YU Tian-you;YANG Qian;XUE Peng;LI Hai-long(School of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;China Railway Eryuan Engineering Group Co Ltd,Chengdu 610031,China)

机构地区：[1]兰州交通大学土木工程学院,甘肃兰州730070 [2]中铁二院工程集团有限公司,四川成都610031

出　　处：《南阳理工学院学报》2020年第4期89-95,共7页Journal of Nanyang Institute of Technology

基　　金：国家自然科学基金重点项目(51639002);中国中铁重大科研项目“德伊高铁盐渍土特性及路基修建关键技术研究”。

摘　　要：提出了一种与高速铁路路基盐胀控制标准相适应的,以颗粒粒径指标、盐胀率、硫酸钠含量为参数的路用硫酸盐渍土评价方法。依托德伊高速铁路建设项目,对沿线分布的硫酸盐渍土展开了可用性评价研究,结果表明:以5 mm作为粗颗粒硫酸盐渍土粗、细料分界粒径,并按其质量比的不同对粗颗粒盐渍土进行组内划分,是一种简便可行的分类方法。不同类型硫酸盐渍土的盐胀率阈值、硫酸钠含量阈值存在较大差异,细粒土的控制标准高于粗粒土。现有相关规范中以盐胀率1%、硫酸钠含量0.5%作为硫酸盐渍土盐胀的判定标准不能满足高速铁路的建设要求。This paper presents a new method for the evaluation of sulphate saline soil for road use,which is suitable for the control standard of salt expansion of high-speed railway subgrade,and takes particle size index,salt expansion rate and sodium sulfate content as parameters.Based on the construction project of Deyi high speed railway,the usability evaluation of sulphate salinized soil distributed along the line is studied.The results show that it is a simple and feasible classification method to use 5 mm as the boundary particle size between coarse and fine materials of coarse-grained sulphate salinized soil,and to divide coarse-grained saline soil into groups according to its mass ratio.The threshold values of salt swelling rate and sodium sulfate content of different types of sulphate soil are quite different,and the control standard of fine-grained soil is higher than that of coarse-grained soil.In the existing relevant specifications,the salt expansion rate of 1% and the sodium sulfate content of 0.5% are used as the criteria for determining the salt expansion of sulfuric acid saline soil,which can not meet the construction requirements of high-speed railway.

关 键 词：铁路路基 硫酸盐渍土 盐胀 颗粒粒径指标 评价方法 

分 类 号：U214.11[交通运输工程—道路与铁道工程]