文献类型：期刊文献

英文题名：Characterisation of nano magnesia-cement-reinforced seashore soft soil by direct-shear test

作者：Wang, Wei[1];Zhang, Chen[1];Li, Na[1];Tao, Feifei[2];Yao, Kai[3]

机构：[1]Shaoxing Univ, Sch Civil Engn, Shaoxing, Peoples R China;[2]Shaoxing Univ, Sch Chem & Chem Engn, Shaoxing, Peoples R China;[3]Natl Univ Singapore, Dept Civil & Environm Engn, 1 Engn Dr 2, Singapore 117576, Singapore

年份：2019

卷号：37

期号：8

起止页码：989

外文期刊名：MARINE GEORESOURCES & GEOTECHNOLOGY

收录：SCI-EXPANDED(收录号：WOS:000479262500010)、、EI(收录号：20190406400256)、Scopus(收录号：2-s2.0-85058035618)、WOS

基金：This work is co-supported by the National Natural Science Foundation of China (41772311), Zhejiang Provincial Natural Science Foundation of China (LY17E080016), Ministry of Housing and Urban-Rural Development of China (2015-k4-003), and Open Research Fund of State Key Laboratory of Ministry of Geomechanics and Geotechnical Engineering (Z017013).

语种：英文

外文关键词：Seashore soft soil; cement; nano magnesia; direct-shear test; shear strength; mathematical model

外文摘要：In this study, the mechanical behaviour of nano magnesia-cement-reinforced seashore soft soil (NmC3S) was evaluated and characterised by the direct-shear testing of seashore soft soil (3S), cement reinforced seashore soft soil (C3S) and NmC3S. The comparison among these three types of soils indicates that NmC3S has greater shear strength and deformation modulus than C3S and 3S. The shear stress of both C3S and NmC3S increase significantly prior to a shear displacement of 1.0 mm, followed by a sharp decline before reaching the critical state. The failure displacement increases as the applied normal stress increases. NmC3S demonstrated greater friction angle than both C3S and 3S; however, the magnitude of its cohesion lies between that of C3S and 3S. Moreover, a mathematical model that describes the shear stress-displacement curve was proposed, which can effectively model the strain-hardening and strain-softening curves of these three types of clays. Finally, a generalised formula for capturing the stress-displacement behaviour of these three materials is presented with the explanations for the physical meaning of each parameter.