CAJ | 학술논문

为了解冻融循环对土工织物膨润土垫（GCL）材料中膨润土膨胀性的影响，通过室内试验研究了不同冻融循环次数下 GCL 材料中膨润土粒径分布及其膨胀指数的变化规律，分析了两者间内在联系，并阐述了膨胀指数变化的微观机理。试验结果表明：随着冻融循环次数的增加，膨胀指数先迅速增加至峰值后再略微下降并趋于平稳，粒径分布则趋于集中；10次以内冻融循环对GCL 材料中膨润土膨胀指数影响较大。提出了主导粒径的概念，认为膨胀指数主要由属于主导粒径的颗粒决定，并给出了主导粒径与膨胀指数间的量化关系。
위료해동융순배대토공직물팽윤토점（GCL）재료중팽윤토팽창성적영향，통과실내시험연구료불동동융순배차수하 GCL 재료중팽윤토립경분포급기팽창지수적변화규률，분석료량자간내재련계，병천술료팽창지수변화적미관궤리。시험결과표명：수착동융순배차수적증가，팽창지수선신속증가지봉치후재략미하강병추우평은，립경분포칙추우집중；10차이내동융순배대GCL 재료중팽윤토팽창지수영향교대。제출료주도립경적개념，인위팽창지수주요유속우주도립경적과립결정，병급출료주도립경여팽창지수간적양화관계。
To analyze the influence of the freeze-thaw cycles on swelling of bentonite in geosynthetic clay liner (GCL),the variation of particle size distribution and the swell index of bentonite in GCL after different freeze-thaw cycles and their correlation were studied through laboratory experiments. The microscopic mechanism about the change of the swell index was demonstrated.The experimen-tal results indicate that the swell index first increases rapidly to a peak value and then slightly decrea-ses to a steady figure with the increase of the number of freeze-thaw cycles,which finally leads to the centralization of particle size distribution.The freeze-thaw cycles within 10 times have relatively greater influence on the swell index of bentonite in GCL.The concept of dominant particle size is put forward to characterize those particles which dominate the swell index of bentonite.The quantita-tive relationship between the dominant particle size and the swell index is also given.