粉细砂土压缩特性试验研究  

Experimental Research on Compression Characteristics of Silt Sandy Soils

作　　者：杜登峰 林寰宇 叶雄威 张树明[1,2] DU Dengfeng;LIN Huanyu;YE Xiongwei;ZHANG Shuming(School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;MOE Key Laboratory of High-speed Railway Engineering,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学土木工程学院,成都610031 [2]西南交通大学高速铁路线路工程教育部重点实验室,成都610031

出　　处：《路基工程》2022年第2期84-88,共5页Subgrade Engineering

基　　金：国家自然科学基金项目(51878577);中国铁路总公司重大课题(2016G002-A)。

摘　　要：以嘎拉山隧道与嘎拉山大桥连接处的路基土为研究对象,采用WG型单杠杆固结仪开展固结试验,通过显著性分析比较各变量及各变量间交互作用对压缩指标的影响程度,研究不同粒径级配、压实度和含水率对粉细砂土压缩特性的影响。结果表明:在完全侧限条件下,细颗粒含量在15%左右时,重塑土的可压缩性最低;压实度增大,压缩性降低;含水率增大,压缩系数逐渐降低,但快慢程度有区别;各因素及其交互作用对压缩模量影响的显著性有较大差别。Taking the subgrade soil of the junction of the Gongga Mountain Tunnel and the Gongga Mountain Bridge as the research object,the consolidation tests were carried out by using WG single-lever consolidation instrument.Through the comparative analysis of significance,the degree of influence of each variable and interaction between variables on compression index,the effects of different particle size gradation,compactness and moisture content on the compression characteristics of silt sandy soils were studied,The results show that under the full lateral limit condition,the compressibility of the remolded soil is the lowest when the fine particle content is about 15%;Compressibility decreases with increasing compactness;With the increase of moisture content,the compression coefficient decreases gradually,but the speed is different.There are significant differences between the factors and their interactions on the compressibility modulus.

关 键 词：粉细砂土 固结试验 压缩模量 显著性分析 交互作用 

分 类 号：TU411.5[建筑科学—岩土工程]