文献类型：期刊文献

英文题名：Investigation on the Triaxial Mechanical Characteristics of Cement-Treated Subgrade Soil Admixed with Polypropylene Fiber

作者：Wang, Wei[1];Zhang, Chen[1];Guo, Jia[2];Li, Na[1];Li, Yuan[1];Zhou, Hang[1];Liu, Yong[3]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]China Univ Geosci, Fac Engn, Dept Civil Engn & Mech, Wuhan 430074, Hubei, Peoples R China;[3]Wuhan Univ, State Key Lab Water Resources & Hydropower Engn S, Wuhan 430072, Hubei, Peoples R China

年份：2019

卷号：9

期号：21

外文期刊名：APPLIED SCIENCES-BASEL

收录：SCI-EXPANDED(收录号：WOS:000498058600082)、、Scopus(收录号：2-s2.0-85075257040)、WOS

基金：This research was funded by the National Natural Science Foundation of China (Grant numbers [41772311]), the Zhejiang Provincial Natural Science Foundation of China (Grant number [LY17E080016]), the Open Research Fund of State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Science (Grant number [Z017013]), the Scientific Research Projects of Zhejiang Department of Housing and Urban and Rural Construction (Grant number [2017K179]), and the International Scientific and Technological Cooperation Projects of Shaoxing University (Grant number [2019LGGH1007]).

语种：英文

外文关键词：fiber-cement-treated subgrade soil; mechanical properties; triaxial test; brittleness index; failure angle

外文摘要：In order to evaluate the improvement effect of fiber on the brittle failure of cement-treated subgrade soil, a series of triaxial unconsolidated undrained (UU) tests were carried out on samples of polypropylene fiber-cement-treated subgrade soil (PCS) with polypropylene fiber mass content of 0 parts per thousand, 2 parts per thousand, 4 parts per thousand, 6 parts per thousand, and 10 parts per thousand. The results showed that, (1) the deviatoric stress-axial strain curve of PCS samples were all strain-softening curves. (2) For the same fiber mass content, the peak stress, residual stress, and strain at peak stress of PCS samples gradually increases with the increase in the confining pressure, while their brittleness index gradually decreases. (3) With the increase in confining pressure, compared with that of the 0 parts per thousand PCS sample, the increase in peak stress, residual stress, and strain at peak stress of 6 parts per thousand PCS sample were in the ranges of 24%-29%, 87%-110%, and 85%-120%, respectively. The decrease in the brittleness index and failure angle was 52%-79% and 16%, while the cohesion and internal friction angle increased by 25.9% and 7.4%, respectively. The results of this study indicate that it is feasible to modify cement subgrade soil with an appropriate amount of polypropylene fiber to mitigate its brittle failure.