粉煤灰土冻融循环后的动力特性试验研究  

Experimental research on dynamic properties of fly ash soil subjected to freeze-thaw cycles

作　　者：魏海斌[1] 刘寒冰[1] 高一平[1] 方瑛[2] 李长雨[1] 

机构地区：[1]吉林大学交通学院 [2]吉林大学测试中心,长春130022

出　　处：《岩土力学》2007年第5期1005-1008,共4页Rock and Soil Mechanics

基　　金：高等学校博士学科点专项科研基金资助(No.20030183025);吉林大学创新基金(No.2004)

摘　　要：为研究粉煤灰土作为路基填料的可行性,把易液化的粉煤灰和易冻胀的粉质黏土按干重1:2混合,通过冻融循环后的动三轴试验,研究了粉煤灰土的动力特性,得出了动强度和循环荷载次数及冻融循环次数的数量关系,以及动模量与动应变及冻融循环次数的关系曲线。研究表明,粉煤灰土经过3次冻融后的动力性能指标优于粉质黏土,具有良好的抗冻性及稳定性,可以作为季冻区路基填料。Tests on composite material from easy liquefaction fly ash and easy freezing silty clay according to dry weight 1：2 are conducted to investigate the dynamic properties of fly ash soils for roadbed filling. The dynamic triaxial tests are made on the two kinds of soils after freeze-thaw cycles. The variation law between the dynamic strength and the number of cycles of dynamic loading and the number of freeze-thaw cycles is obtained. The relationship curves of the dynamic stress-strain and the dynamic elastic modulus-elastic strain and the curve of the dynamic modulus and the number of freeze-thaw cycles are also given. The research shows that the dynamic properties of fly ash soils（l：2） is better than silty clay subjected to freeze-thaw cycles. After 3 cycles of freezing and thawing, its dynamic strength and dynamic modulus reach stability. It has superiority as roadbed filling.

关 键 词：粉煤灰土 冻融循环 动强度 动模量 

分 类 号：TU413.5[建筑科学—岩土工程]