黄河堤防粉土增湿变形特性试验研究

对黄河堤防粉土增湿变形特性进行了试验分析,认为:①土料试样在不同的压力下浸水,从膨胀转变为湿陷的界限压力值为330 kPa,当压力值小于25 kPa时,该土样的膨胀量较大;②击实土样的制备含水率对于增湿后膨胀变形的影响很大,在工程实际中应在大于或小于最优含水率时进行试验研究;③不同的粉土土质具有不同的增湿变形特性,应根据工程实际情况,分别针对不同的土质进行增湿胀缩变形试验。

Test on Characteristics of Humectation and Deformation of Silt Loam of the Yellow River Embankments

It tests and analyzes the humectation and deformation of silt loam of the Yellow River embankments and deems that a) under different pressures,the immersed soil test piece turns from expansion to wet boundary pressure value 330 kPa.When pressure value is smaller than 25 kPa,the expansion is greater;b) the prepared percentage of moisture of puddle soil sample has greater influence to expansion and deformation after humectation.It should conduct test and study when it is greater or smaller than the optimal percentage of moisture during practical works and;c) different silt loam has different characteristics of humectation and deformation.It should conduct tests of humectation,expansion and deformation for different loam according to the actual condition of the project.