%0 Journal Article %T 膨胀土膨胀变形试验研究 %T Experimental study on expansion and deformation of expansive soil %A 李进前 %A 王起才 %A 张戎令 %A 梁柯鑫 %A 李航辉 %A 刘爱仓 %A LI,Jinqian %A WANG,Qicai %A ZHANG,Rongling %A LIANG,Kexin %A LI,Hanghui %A LIU,Aicang %J 水利水运工程学报 %J Hrdro-Science and Engineering %@ 1009-640X %V %N 1 %D 2019 %P 60-66 %K 大尺寸; 膨胀土; 注水方式 %K largescale; expansive soil; mode of water injection %X 为了研究不同注水方式对膨胀土膨胀量的影响,以及大尺寸重塑膨胀土浸水膨胀的变化规律,取某高速铁路地基膨胀泥岩重塑土样,进行开孔与不开孔的膨胀土浸水膨胀试验,并对不同厚度的大尺寸膨胀土试样进行浸水膨胀变形试验。试验结果表明:开孔注水与不开孔注水的膨胀土膨胀时程曲线有很大不同,开孔注水的土样膨胀时程曲线可以分为初始快速膨胀、减速膨胀、趋于稳定3个阶段;不开孔注水的土样膨胀时程曲线可分为初始缓慢膨胀、快速膨胀、减速膨胀和趋于稳定阶段4个阶段。分析得到土样损失体积率与膨胀量损失量的关系。不同厚度的大尺寸膨胀土试样膨胀时程曲线整体呈外凸形增长趋势,并且每级注水后,膨胀量也呈外凸形增长趋势;大尺寸膨胀土试样的真实膨胀量随着厚度的增加而增大,但增幅减小,真实膨胀量随着上覆荷载的增大而减小,减幅也降低。 %X Expansive soil stone remoulded samples from the base of an expressway were taken for opening and non-opening expansive soil water immersion expansion test and large-scale expansive soil samples with different thicknesses were taken for water immersion expansive deformation test in order to study the influence of different modes of water injections on the expansion increment of expansive soil and the change rule of immersion expansion of large-scale remoulded expansive soil. The test results show that the expansion time interval curve of the expansive soil injected with water through opening and non-opening way is largely different. To be specific, the expansion time interval curve of the soil sample injected with water through opening way can be generally divided into three stages: initial fast expansion stage, decelerated expansion stage and stable expansion stage; on contrast, the expansion time interval curve of the other one through non-opening way can be divided into four stages: initial slow expansion stage, fast expansion stage, decelerated expansion stage and stable expansion stage. The relationship between soil sample loss volume fraction and expansion increment loss is analyzed to be Δδ=0.617ΔV+0.02. The expansion time interval curve of the large-scale expansive soil sample with different thicknesses is in a convex growth trend, so is the expansion increment after the water injection of each grade. The real expansion increment of the large-scale expansive soil sample will increase along with the increase of thickness but the amplitude of increase declines. The real expansion increment will decline along with the increase of overlying load, but the amplitude of increase declines. %R %U http://slsygcxb.cnjournals.org/ch/reader/view_abstract.aspx %1 JIS Version 3.0.0