Effect of temperature on soil-water characteristics and hysteresis of compacted Gaomiaozi bentonite  

作　　者：叶为民 万敏 陈宝 陈永贵 崔玉军 王驹 

机构地区：[1]Key Laboratory of Geotechnical and Underground Engineering,Ministry of Education,Tongji University [2]United Research Center for Urban Environment and Sustainable Development,Ministry of Education [3]Ecole des Ponts Paries Tech [4]Beijing Research Institute of Uranium Geology

出　　处：《Journal of Central South University》2009年第5期821-826,共6页中南大学学报（英文版）

基　　金：Projects(40772180, 40572161, 40802064) supported by the National Natural Science Foundation of China;Project ([2007]831) supported by Commission of Science, Technology and Industry for National Defense of China;Project(07JJ4012) supported by Hunan Provincial Natural Science Foundation of China;Project(20080430680) supported by China Postdoctoral Science Foundation;Project(08R214155) supported by Shanghai Postdoctoral Scientific Program of China;Project(B308) supported by Shanghai Leading Academic Discipline Project of China

摘　　要：Laboratory tests under different constraint conditions were carried out to obtain the soil-water retention curves(SWRCs) of highly-compacted confined/unconfined Gaomiaozi(GMZ) bentonite at 20,40 and 80 ℃,respectively. The effect of temperature on the soil-water characteristics of the highly-compacted GMZ bentonite was analyzed. The results show that the water retention capacity of the highly-compacted GMZ bentonite decreases as the temperature increases under unconfined and confined conditions. At a certain temperature,the constraint conditions have little influence on the water retention capacity of the compacted bentonite at high suction,but the water retention capacity of the confined specimen is lower than that of the unconfined specimen at low suction. Under unconfined conditions,the hysteretic behaviour of the compacted bentonite decreases with increasing temperature. At high suction(>4 MPa) ,the hysteretic behaviour of the unconfined bentonite tends to increase with the decrease of the suction. In summary,the hysteretic behaviour of the compacted bentonite is not significant.Laboratory tests under different constraint conditions were carried out to obtain the soil-water retention curves （SWRCs） of highly-compacted confined/unconfined Gaomiaozi （GMZ） bentonite at 20, 40 and 80 ℃, respectively. The effect of temperature on the soil-water characteristics of the highly-compacted GMZ bentonite was analyzed. The results show that the water retention capacity of the highly-compacted GMZ bentonite decreases as the temperature increases under unconfined and confined conditions. At a certain temperature, the constraint conditions have little influence on the water retention capacity of the compacted bentonite at high suction, but the water retention capacity of the confined specimen is lower than that of the unconfined specimen at low suction. Under unconfined conditions, the hysteretic behaviour of the compacted bentonite decreases with increasing temperature. At high suction （〉4 MPa）, the hysteretic behaviour of the unconfined bentonite tends to increase with the decrease of the suction. In summary, the hysteretic behaviour of the compacted bentonite is not significant.

关 键 词：Gaomiaoz BENTONITE soil-water characteristic hysteretic behavior nuclear waste repository water retention capacity TEMPERATURE 

分 类 号：S152[农业科学—土壤学]