摘要
以河南省新乡地区某处膨胀土为研究对象,利用当地广泛分布的粉砂土对其进行改良,通过室内实验,研究不同粉砂土掺量对改良土膨胀特性及力学特性的影响。实验结果表明:随着粉砂土掺量的增加,无荷载和有荷载膨胀率在粉砂土掺量小于30%时快速下降,大于30%时缓慢下降;膨胀力随粉砂土掺量增加呈先缓慢下降后加速下降再缓慢下降的趋势;改良土黏聚力在粉砂土掺量为10%时达到最大,之后随粉砂土掺量增加先快后慢下降,内摩擦角则随粉砂土掺量增加而线性增加;粉砂土掺量为20%时,无侧限抗压强度增加至最大,后随粉砂土掺量增加逐渐减小,减小的速率为先慢后快再慢;掺不同含量粉砂土对膨胀土膨胀和力学特性影响较大,可显著改善膨胀土的使用性能。
Study on expansive soil somewhere in Xinxiang area of Henan Province,the expansive soil was improved by using the widely distributed silt soil. Through laboratory experiments,the effects of different silt content on the expansion characteristics and the mechanical properties were studied. Experimental results show that: With the increase of the amount of silty sand,the no-load expansion ratio and the load expansion ratio decrease rapidly when the amount of silt is less than 30%,and decrease slowly when it exceeds 30%. The expansion force decreases slowly with the increase of silt content,then accelerates and then decreases slowly. The improved soil cohesion reaches the maximum when the amount of silt is 10%,and then decreases rapidly with the increase of the amount of silt. The internal friction angle increases linearly with the increase of the amount of silt. When the amount of silt is 20%,the unconfined compressive strength increases to the maximum,and then the amount of silt increases gradually decreases,and the rate of decrease is slower and then slower. Different content of silty sand has great influence on the expansion and mechanical properties of expansive soil,which can significantly improve the performance of expansive soil.
作者
王欢
任俊玺
凡超文
张旭
李宝宝
Wang Huan;Ren Junxi;Fan Chaowen;Zhang Xu;Li Baobao(Liboratory for Recycled and Functional Building Materials,Henan University,Kaifeng,Henan 475004,P.R.China;School of Civil Engineering and Architecture,Henan University,Kaifeng,Henan 475004,P.R.China)
出处
《地下空间与工程学报》
CSCD
北大核心
2021年第1期172-178,共7页
Chinese Journal of Underground Space and Engineering
基金
河南省高等学校重点科研项目(18A580002)
开封市科技发展计划(1801004)
甘肃省交通运输厅科研项目(2013-07)
河南省科技攻关项目(182102310737)。
关键词
膨胀土
粉砂土
膨胀特性
力学特性
改良
expansive soil
silty soil
expansion properties
mechanical properties
improvement
