吉林省延边地区路基边坡膨胀土孔隙分布特性

针对膨胀土边坡稳定性问题,对吉林省延边地区路基边坡膨胀土进行野外调查及室内测试.对膨胀土的粒度成分、矿物成分进行了测试鉴定,并对土样进行了膨胀性试验.此外利用压汞试验对其进行了孔隙结构特征的研究,利用分形几何理论,结合土样的膨胀特性,将膨胀土孔隙分布分成大、中小、微、超微孔隙4个区间.研究结果表明:经膨胀性测试,研究区5个土样为弱膨胀性土,其中膨胀力较强的土孔隙在超微至微孔隙区间分布相对较多,而膨胀力较弱的土孔隙分布在中与大孔隙区间相对较多.

Pore Size Distribution of Expansive Soil of the Subgrade Slope in Yanbian Region， Jilin Province

This research aims at the stability of expansive soil which were collected from the subgrade slope of expansive soil in Yanbian region of Jilin Province. The physicochemical property， soil grain， mineral composition and the expansion property of the specimen were tested. The pore structure characteristics were studied using mercury injection experiment. Furthermore， the soil pores were divided into four size intervals， i.e.， big pores， moderate pores， micro-pores and ultra-micro pores by using fractal geometry theory. The study indicated that five specimens were identified as slightly-expansive soil by expansibility testing. Pore sizes of the high expansive soil mainly fall in between micro-pores and ultra-micro pores， while pore sizes of the weak expansive soil mainly fall in between big and moderate pores.