颗粒级配对压实砾砂类氯盐渍土溶陷特性的影响  

Effect of particle gradation on collapse characteristics of compacted gravel sand chloride saline soil

作　　者：张莎莎[1] 易方正 杨晓华[1] 张瑞元 陈伟志 ZHANG Shasha;YI Fangzheng;YANG Xiaohua;ZHANG Ruiyuan;CHEN Weizhi(School of Highway,Chang'an University,Xi'an 710064,Shaanxi,China;China Railway Eryuan Engineering Group Co.,Ltd.,Chengdu 610031,Sichuan,China)

机构地区：[1]长安大学公路学院,陕西西安710064 [2]中铁二院工程集团有限公司,四川成都610031

出　　处：《建筑科学与工程学报》2024年第6期162-170,共9页Journal of Architecture and Civil Engineering

基　　金：陕西省自然科学基础研究计划项目(No.2019JM-147);中国中铁股份有限公司科技开发计划项目(No.2017-重大-11-04);青海省交通运输厅科技项目(2020-02)。

摘　　要：为探究颗粒级配对砾砂类氯盐渍土溶陷特性的影响,针对压实砂类(砾砂、粗砂、中砂)及砾石类盐渍土开展室内溶陷试验,并基于试验数据,采用SPSS软件构建了溶陷率与各影响因素关系的分析模型,明确了砾砂类氯盐渍土溶陷敏感参数及权重。结果表明:砾砂盐渍土的溶陷率随细颗粒含量和2~5 mm颗粒含量增加均呈先增大后减小的趋势;粗砂和中砂盐渍土的溶陷率随细颗粒含量的增加而减小,随2~5 mm颗粒含量的增加而增大;砾石类盐渍土的溶陷率随细颗粒含量的增加而增大,随含盐量的增加呈先增大后减小的趋势;对于砾砂,细颗粒含量、2~5 mm颗粒含量对其溶陷率的影响权重分别为0.864、0.126,对于粗砂,细颗粒含量、2~5 mm颗粒含量对其溶陷率的影响权重分别为0.257、0.722,对于中砂,细颗粒含量、2~5 mm颗粒含量对其溶陷率的影响权重分别为0.573、0.411,对于砾石类盐渍土,含盐量、细颗粒含量、2~5 mm颗粒含量对其溶陷率的影响权重分别为0.681、0.234、0.049。In order to explore the influence of particle size distribution on the collapse characteristics of gravel sand chloride saline soil,indoor collapsibility tests were carried out for compacted sand(gravel sand,coarse sand,medium sand)and gravel saline soil.Based on the test data,the analysis model of collapse rate and various influencing factors was constructed by SPSS software,and the sensitive parameters and weights of collapsibility of gravel sand chlorine saline soil were clarified.The results show that the collapsibility rate of gravel sand saline soil increases first and then decreases with the increase of fine particle content and 2-5 mm particle content.The collapsibility rate of coarse sand and medium sand saline soil decreases with the increase of fine particle content,and increases with the increase of 2-5 mm particle content.The collapsibility rate of gravel saline soil increases with the increase of fine particle content,and increases first and then decreases with the increase of salt content.For gravel sand,the influence weights of fine particle content and 2-5 mm particle content on its collapsibility rate are 0.864 and 0.126 respectively.For coarse sand,the influence weights of fine particle content and 2-5 mm particle content on its collapsibility rate are 0.257 and 0.722 respectively.For medium sand,the influence weights of fine particle content and 2-5 mm particle content on its collapsibility rate are 0.573 and 0.411 respectively.For gravel saline soil,the influence weights of salt content,fine particle content and 2-5 mm particle content on its collapsibility rate are 0.681,0.234 and 0.049 respectively.

关 键 词：路基工程 氯盐渍土 颗粒级配 溶陷性 

分 类 号：TU448[建筑科学—岩土工程]