重塑土室内制样技术对比研究  

Development of the Specimen-Preparing Technique for Remoulded Soil Samples

作　　者：郑剑锋[1] 马巍[1] 赵淑萍[1] 蒲毅彬[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃兰州730000

出　　处：《冰川冻土》2008年第3期494-500,共7页Journal of Glaciology and Geocryology

基　　金：国家自然科学基金项目(40501016);国家自然科学基础人才培养基金冰川学冻土学特殊学科点项目(J0630966)资助

摘　　要：通过对兰州黄土和北麓河粘土以不同制样方法进行重塑土样的制备,对比了不同制样技术所得土样各层的干密度及含水量分布情况,确定了制作均匀样品的较为适宜的制样方法.结果表明:两头压实法所制得的样品其干密度和含水量的分布较为均匀,分布较有规律,能得到初始损伤较小的试样,比分层击实法及泥浆法更容易控制试样的均匀性.对两头压实法而言,压制时间不同,对于试样整体的均匀性也有影响.对于粘粒含量较高的土,用两头压实法较短时间即可获得较均匀的试样.The method of preparing soil samples is important to those experiments of soil mechanics. So remoulded soil samples of water-unsaturated or water-saturated made from Lanzhou Loess and Bei- luhe Clay are made through different specimen-preparing methods in this paper. Contrasting the dry density and moisture content distributions, it is found that the best method for uniform sample is confirmed. The result shows that samples got by double-end pressing method and little-pressing method are more uniform, the distributions, of dry density and moisture content are more regular, and the initial damage of samples are smaller, than those made through slip-consolidation method and layered-bumping method. To the double-end pressing method, the more time pressing, the more uniform samples are. Considering the pressing efficiency, the 8h double-end pressing method is recommended. The higher the clay grain content is, the better the uniformity of the sample is. Therefore, Beiluhe Clay samples can be easierly gotten by double-end pressing method easily. Considering the above factors, it is no doubtful that the method of double-end pressing is just the proper method.

关 键 词：重塑土 干密度 含水量 制样技术 试样均匀性 

分 类 号：TU411[建筑科学—岩土工程]