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.
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
关键词
土壤持水曲线
温度升高
膨润土
压实
滞后
保水能力
水分特征
密闭条件
Gaomiaoz
bentonite
soil-water characteristic
hysteretic behavior
nuclear waste repository
water retention capacity
temperature
