文献类型：期刊文献

英文题名：Mechanical behaviors and damage model of expansive soil admixed with composite materials

作者：Zhang, Chen[1,2];Wang, Wei[2];Zhu, Zhiduo[1];Li, Na[2];Pu, Shaoyun[1];Li, Yuan[2]

机构：[1]Southeast Univ, Sch Transportat, Nanjing 211189, Jiangsu, Peoples R China;[2]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Zhejiang, Peoples R China

年份：2021

卷号：14

期号：15

外文期刊名：ARABIAN JOURNAL OF GEOSCIENCES

收录：SCI-EXPANDED(收录号：WOS:000691864800004)、、Scopus(收录号：2-s2.0-85110997200)、WOS

基金：This research was funded by the National Natural Science Foundation of China (Grant numbers [41772311, 42072297]), the Research Fund of Zhejiang Provincial Department of Housing and Urban-Rural Development [2017K179, 2016K130] and the Science and Technology Project of Jiangsu Provincial of Traffic Engineering Construction Bureau.

语种：英文

外文关键词：Polypropylene fiber; Nano-MgO; Cement-treated expansive soil; Triaxial test; Microscopic test; Damage model

外文摘要：This paper reports a series of triaxial unconsolidated undrained (UU) tests and microscopic tests on cement-treated expansive soil (CES), polypropylene (PP) fiber cement-treated expansive soil (PCES), and nano-MgO (NM) cement-treated expansive soil (MCES). The experimental observations indicated that (1) the deviatoric stress-axial strain curves of treated soils all exhibit strain-softening characteristics, and the increase of deviatoric stress of treated soils is sensitive to the increase of confining pressure. (2) The addition of PP fiber and NM has a good improvement effect on the bearing capacity, shear strength, ductility, and brittleness of CES. (3) NM promotes the hydration reaction of cement and reduces the internal pores inside CES, while PP helps to form tight bonds between gels. (4) Although NM and PP can both improve the mechanical properties of CES, the reinforcement mechanism is different with PP increasing its ductility and NM compacting its structure. In addition, a new damage model (DM) was developed, being adaptable to treated soils under various confining pressures.