基于高铁变形控制的粗颗粒硫酸盐渍土盐胀影响因素的试验研究  

Experimental Study on the Influence Factors of Soil Salt Swelling in Sulphuric Acid Based on Deformation Control of High Speed Iron

作　　者：司培国 曹博 王茂靖[2] 蒲增刚 唐科行 SI Pei-guo;CAO Bo;WANG Mao-jing;PU Zeng-gang;TANG Ke-xing(College of Civil Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China;China Railway Engineering Group Co.,Ltd.,Chengdu 610031,China)

机构地区：[1]兰州交通大学土木工程学院,兰州730070 [2]中国中铁二院工程集团有限责任公司,成都610031

出　　处：《价值工程》2019年第32期188-190,共3页Value Engineering

基　　金：中铁二院工程集团有限责任公司科研项目（科2016-41-2）;国家科技支撑计划资助项目（2014BAG05B05）

摘　　要：随着国内外在盐渍土地区修建的铁路项目的增多,盐渍土盐胀导致的路基变形问题日益严重,为解决由于盐胀特性导致的路基盐胀问题,本文将综合考虑硫酸钠含量、级配类型、含水率作为粗颗粒盐渍土盐胀特性的主要因素进行精细化研究,来研究在综合影响因素下盐渍土的盐冻胀特性。在硫酸钠含量较低的情况下,相对细颗粒硫酸盐渍土,粗颗粒盐渍土在不同含水率下的最大盐胀量很小;在含水量最佳情况下,细颗粒组最大盐胀量为0.61mm,而在自然含水率下,细颗粒组的最大盐胀量为0.31mm,表明土体含水率是影响盐胀的主要因素;随着硫酸钠含量的增加,粗粒组和中粒组盐胀增加速率明显缓于细颗粒组。With the increase of railway projects built in saline soil areas at home and abroad, the problem of roadbed deformation caused by salt expansion of saline soil is becoming more and more serious. In order to solve the problem of roadbed salt expansion caused by salt expansion characteristics, this paper will comprehensively consider the sodium sulfate content, gradation type and water content as the main factors of salt swelling characteristics of coarse-grained saline soil to study the salt heave expansion characteristics of saline soil under comprehensive influencing factors. Under the condition of low sodium sulfate content, relative to fine-grained sulphate soil, the maximum salt swell of coarse-grained saline soil under different water content is small;in the best water content, the maximum salt expansion of the fine-grained group is 0.61mm, while in natural water rate, the maximum salt expansion of the fine particle group is 0.31mm, which indicates that the soil moisture content is the main factor affecting the salt expansion. With the increase of sodium sulfate content, the salt swelling rate of the coarse grain group and the middle grain group is obviously slower than that of fine particle group.

关 键 词：粗颗粒 盐渍土 颗粒级配 含水率 

分 类 号：TU448[建筑科学—岩土工程]