压实黄土状粉土毛细特性试验研究  

Experimental Study on Capillary Property of Compacted Silty Soil

作　　者：落宇杰 马富丽[1] 白晓红[1,2] 

机构地区：[1]太原理工大学建筑与土木工程学院岩土与地下工程山西省重点实验室,太原030024 [2]黄土地区公路建设与养护技术交通行业重点实验室,太原030006

出　　处：《科学技术与工程》2017年第12期234-240,共7页Science Technology and Engineering

基　　金：国家自然科学基金(51178287);黄土地区公路建设与养护技术交通行业重点实验室开放课题(KLTLR-Y12-1);山西省自然科学基金(2010011029)资助

摘　　要：基于压实黄土状粉土的基本性质,利用一维土柱仪进行毛细作用模型试验。数据分析、图形拟合后,得到了压实黄土状粉土毛细水上升规律。试验结果表明,毛细水上升的速率随毛细上升高度的增加而逐渐衰减。当毛细水到达某截面时,该截面处的基质吸力先平缓变小,后急剧下降,随之渐趋于稳定;该截面处的体积含水率先平缓上升,后急剧增大,随之渐趋于稳定。对毛细水上升高度随时间变化曲线、体积含水率与基质吸力关系进行拟合统计。通过对比三组不同土柱高度的试验结果,表明当土柱长细比为4.68和9.54时,毛细水上升规律基本一致,故证明当长细比大于4.68时,可按一维毛细作用考虑。Based on tests of the compacted silt soil, the indoor one dimensional soil column capillary test was conducted. The capillary properties of compacted silt soil have been obtained through analyzing data and fitting curves. Experiment results indicate that the rising speed of capillary water slows down as the height of capillary water is increasing. When capillary water moves to one section, matric suction in this section decreases slowly at beginning, then falls sharply, finally tends to be stability. Also, the volumetric water content of soil in this section increases slowly first, then grows quickly, turns to be stability finally. The statistics functions of the rising height of capillary water was giver up vs time and volumetric water content and matric suction. The comparison of three testing results shows that the capillary properties of the soils are mostly similar when the slendernesses of the soil columns are 4. 68 and 9. 54, which verifies that the soil column with the slenderness more than 4. 68 can be consid-ered as one dimensional column.

关 键 词：压实粉土 毛细作用 基质吸力 体积含水率 毛细水上升高度 

分 类 号：TU411.2[建筑科学—岩土工程]