摘要
以河南南阳某公路的膨胀土为研究对象,在实验室通过试验得到改良膨胀土的最优二灰比,在此基础上以不同的玄武岩纤维掺入量和养护周期为变量,通过击实试验、胀缩试验、无侧限抗压强度实验以及直接剪切试验研究膨胀土各个指标的变化规律。结果表明:掺入玄武岩纤维后膨胀土的膨胀量和膨胀力随玄武岩纤维掺入量的增加呈减小趋势,在掺入量为0.3%左右膨胀量和膨胀力最小;经过养护的膨胀土的膨胀量和膨胀力呈减小趋势,在14d左右达到最小;掺入玄武岩纤维后膨胀土的无侧线抗压强度和抗剪强度都呈上升趋势,且都在掺入量为0.3%左右达到最优;经过养护的膨胀土试样无侧限抗压强度有明显提高,在养护周期14d时达到最大;经过养护的膨胀土试样的抗剪强度有明显提高,随着养护时间的增长抗剪强度逐渐增大,没有出现最大值。
The objective of this experiment is expansive soil from a highway in Nanyang,Henan.After acquiring the two cement ratio from the lab experiment,the paper analyzed the basalt with different fiber incorporation and maintenance cycle by the compaction experiment,expansive experiment,the unconfined compressive strength and direct shear test study regular pattern of expansive soil.The results show that the basalt fiber can greatly improve the compressive strength of expansive soil.Adding 0.3%expansive oil achieves the minimum compressive strength.The maintained expansive soil will decrease and reach its minimum in 14 days.But after adding 0.3 % basalt fiber,the unconfined compressive strength and direct shear will increase to the best.The unconfined compressive strength of maintained expansive soil will increase and reach its maximum in 14 days.With time going by,its direct shear strength will be enhanced dramatically,but with no maximum.
出处
《湖北工业大学学报》
2016年第2期89-92,共4页
Journal of Hubei University of Technology
基金
国家自然科学基金
项目编号51209084
关键词
膨胀土
玄武岩纤维
养护龄期
膨胀力
抗压强度
抗剪强度
expansive oil
basalt fiber
the days of maintenance
expansive strength
compressive strength
shearing strength