新疆阿尔泰膨润土土水特征的室内试验研究  

Experimental study on soil-water characteristics of Xinjiang Altay bentonite

作　　者：周敏娟[1] 易发成[1] 胡立[1] 王晓东[2] 

机构地区：[1]西南科技大学核废物与环境安全国防重点学科实验室,四川绵阳621000 [2]四川省地质工程勘察院,成都610000

出　　处：《工程勘察》2011年第2期7-11,共5页Geotechnical Investigation & Surveying

基　　金：国防科研项目(批准文号:A3120080126)

摘　　要：在介绍渗析(液相)法与气相法的基础上,对新疆阿尔泰膨润土在自由状态下的土水特征进行了室内实验研究,获取了相应的土水特征曲线,并对所得的土水特征曲线的基本特征进行了分析研究,最后提出了土水特征曲线的几种表达方式,分析了新疆阿尔泰膨润土的体积变化特性及其对土水特征曲线形状的影响。结果表明:实验室中渗析(液相)法与气相法的结合,可以完成整个吸力范围内土的土—水特征曲线的量测;新疆阿尔泰膨润土具有极强的吸水性和膨胀性,但其持水性能低于内蒙古高庙子膨润土,其原因可能与塑性指数大小有关;对于体积受吸力变化影响较显著的膨润土,宜用重力含水量表达其土—水特征曲线。The experimental study has been carried out on Xinjiang Altay bentonite which is in the free state to obtain the corresponding soil-water characteristic curves ﹙ SWCC ﹚ on the basis of introducing the dialysis ﹙ LC ﹚ method and gas phase method,and the basic characteristics of the SWCC is also analyzed.Several expressions for the SWCC are put forward,and the characteristics of the volume change of Altay bentonite and its impact on the shape of SWCC are analyzed.The results show that the measurement of the soil-water characteristic curves in the entire range of suction could be completed by combining the dialysis ﹙ LC ﹚ method with gas phase method;that Altay bentonite is of strong water absorption and swelling property,but it＇s water retention is lower than that of the GMZ bentonite which may be related to the plasticity index;and that it is appropriate to use gravity water content to express the soil-water characteristic curves of the bentonite whose volume changes significantly with the change of the suction.

关 键 词：高放废物处置 新疆膨润土 渗析(液相)法 气相法 土水特征曲线 体积变化 

分 类 号：P69[天文地球—地质学]