复合材料改性城市路基土短龄期三轴力学特性  

Triaxial Mechanical Properties of Composite Material Modified Urban Subgrade Soil at Short Age

作　　者：方睿 李犇 张晨 钱彪 张芳[2] FANG Rui;LI Ben;ZHANG Chen;QIAN Biao;ZHANG Fang

机构地区：[1]同创工程设计有限公司,浙江绍兴312000 [2]绍兴文理学院,浙江绍兴312000

出　　处：《城市道桥与防洪》2022年第10期204-207,M0019,共5页Urban Roads Bridges & Flood Control

基　　金：浙江省建设科研项目(2019K171);绍兴文理学院研究生科研课题(绍学院研〔2020〕24号)。

摘　　要：为了探究纳米Mg O对水泥路基土短龄期下的改性效果,分别对水泥改性路基土(简称“水泥土”)和1.5%掺量纳米Mg O改性水泥路基土(简称“纳米水泥土”)试样进行不固结不排水(UU)三轴试验。结果表明:(1)水泥土和纳米水泥土试样的偏应力-轴向应变曲线均为软化型曲线,试样表现为脆性破坏。(2)水泥土和纳米水泥土试样力学特性的提升均对围压的升高具有较好的敏感性。(3)纳米Mg O的掺入对水泥土试样的峰值应力、残余应力、黏聚力和内摩擦角均具有较好的提升效果。上述结果表明,掺入纳米Mg O对水泥土试样进行力学特性改善是可行的,并且纳米Mg O主要在于试样结构的改善。In order to explore the effect of Nano-Mg O on the modification of cement subgrade soil at short age,the non-consolidation and non-drainage(UU)triaxial tests are carried out respectively for the samples of cement modified subgrade soil("cement soil"for short)and 1.5%-content Nano-Mg O modified cement subgrade soil("Nano cement soil"for short).The results show that:(1)the deviatoric stress-axial strain curves of cement soil and Nano cement soil samples are softening curves,and the samples show brittle failure.(2)The improvement of mechanical properties of cement soil and Nano cement soil has the good sensitivity to the increase of confining pressure.(3)The addition of Nano-Mg O has a good improving effect on the peak stress,residual stress,cohesion and internal friction angle of the cement soil samples.The above results show that it is feasible to improve the mechanical properties of the cement soil samples by adding Nano-Mg O,and Nano-Mg O mainly focuses on the improvement of the sample structure.

关 键 词：水泥路基土 纳米Mg O 三轴试验 力学特性 

分 类 号：U416.1[交通运输工程—道路与铁道工程]