重塑黄土卸荷回弹变形特性研究  

Experimental study on the rebound deformation of loess under unloading

作　　者：闫恩 叶朝良[2] 李莹辉[1] Yan En;Ye Chaoliang;Li Yinghui(Shijiazhuang Posts and Telecommunications Technical College,Shijiazhuang 050021,China;Shijiazhuang Tiedao University,Shijiazhuang 050043,China)

机构地区：[1]石家庄邮电职业技术学院,河北石家庄050021 [2]石家庄铁道大学,河北石家庄050043

出　　处：《山西建筑》2022年第17期123-126,共4页Shanxi Architecture

摘　　要：以宝兰重塑黄土为研究对象,通过大量一维压缩卸荷试验研究了重塑黄土卸荷回弹变形特性及其内在影响因素,结果表明:黄土在卸荷比小于0.2时,几乎不发生回弹,并得出黄土临界卸荷比介于0.2~0.33;重塑黄土试样回弹率随预压荷载增加呈衰减趋势;土体含水率和干密度是影响土体回弹的内在因素,当含水率增加时,回弹率增大,当含水率在6%~22%范围变化时,试样回弹量相差可达0.07 mm~0.1 mm;干密度增加时,回弹率减小,当干密度在1.45 g/cm^(3)~1.85 g/cm^(3)范围变化时,试样回弹量相差可达0.02 mm~0.15 mm,并分析了二者影响回弹变形的机理。Rebound of remodeled loess under unloading and the inherent influence factor were studied through a lot of conventional compression and unloading test,and the mechanism was analysised.The results indicated that when loess’s unload ratio is lower than 0.2,rebound deformation doesn’t happen merely,and the critical unload ratio of loess is between 0.2 and 0.33.Total rebound quantity of soil is made of different depth soil’s rebound.The soil’s ratio-rebound will reduce with the increasing of overburden on the soil.The soil’s moisture content and dry density is the internal factors that affect soil’s rebound.The ratio-rebound will increase with the increasing of moisture content.When the moisture content changes in the range 6%to 22%,the difference of rebound can reach 0.07 mm to 0.1 mm.The ratio-rebound will reduce with the increasing of dry density.When the dry density changes in the range 1.45 g/cm^(3) to 1.85 g/cm3,the difference of rebound can reach 0.02 mm to 0.15 mm.The mechanism of rebound have been analysised.

关 键 词：黄土 卸荷比 含水率 干密度 

分 类 号：TU411[建筑科学—岩土工程]