长江科学院院报2019，Vol.36Issue(12)：107-112,120,7.DOI:10.11988/ckyyb.20180459
改性钠羧甲基纤维素加固粉砂土水稳性及稳定机理分析
Silty Sand Stabilized by Modified Carboxymethylcellulose:Water Stability and Mechanism of Stabilization
摘要
Abstract
Soil stabilizer can be used to improve the properties of soil. In this study, the water stability and stabili-zation mechanism of silty sand stabilized by modified carboxymethylcellulose ( M-CMC) were investigated via disin-tegration test of stabilized silty sand dosed with varying content of M-CMC. Monitoring of disintegration and meas-urement of complete disintegration coefficient ( CR ) of soil samples suggest that with the augment of M-CMC dos-age, the incipient time of disintegration delayed, the content of coarse particles increased, sediment in suspension decreased and the value of CR dropped sharply; no disintegration was observed when the content of M-CMC reached 0. 9%. Furthermore, results of infiltration, matric suction, shear strength, chemical composition and microstructure showed that the size of aggregates increased, infiltration coefficient reduced, suction and shear strength both en-hanced together with the increasing of M-CMC content, thereby revealing " membrane effect" on the surface of soil particles, " absorption effect" between adjoining particles, and " bonding effect" between aggregates from M-CMC. As a result, the cementation between particles transformed from point contact to line and plane contact, and single particles changed to aggregates with net cementation, which modified the water stability of soil.关键词
粉砂土/改性钠羧甲基纤维素/加固剂/胶结作用/结构团聚体/水稳性/稳定机理Key words
silty sand/modified carboxymethylcellulose/reinforcement agent/cementation/structural aggregate/water stability/stabilization mechanism分类
天文与地球科学引用本文复制引用
杨晴雯,裴向军,黄润秋..改性钠羧甲基纤维素加固粉砂土水稳性及稳定机理分析[J].长江科学院院报,2019,36(12):107-112,120,7.基金项目
国家重点基础研究发展计划(973)项目(2014CB744703) （973）
四川省国土资源厅"8·8"九寨沟地震灾区生态化地质灾害防治重大科技支撑研究课题(KJ-2018-20) （KJ-2018-20）
新疆交通建设集团股份有限公司资助项目(2016010) （2016010）
