CAJ | 학술논문

非连续变形分析方法（DDA ）能方便地模拟多边形颗粒的接触和变形。本文提出多边形道砟颗粒的生成方法，并使用DDA方法分析道砟的自然堆积和单轴压缩过程。研究结果表明：道砟自然堆积休止角同时受到道砟颗粒表面摩擦角、颗粒咬合作用、颗粒和底板摩擦角的影响；DDA方法能够成功反演室内单轴压缩试验，是研究道砟压缩特性的有效手段；由于道砟颗粒较硬，松散道砟堆积体的单轴压缩过程即在塑性阶段后还存在一个弹性硬化阶段，在这两个阶段的转折点上“弹性硬化应力”可以看作是道砟的“先期固结压力”。
비련속변형분석방법（DDA ）능방편지모의다변형과립적접촉화변형。본문제출다변형도사과립적생성방법，병사용DDA방법분석도사적자연퇴적화단축압축과정。연구결과표명：도사자연퇴적휴지각동시수도도사과립표면마찰각、과립교합작용、과립화저판마찰각적영향；DDA방법능구성공반연실내단축압축시험，시연구도사압축특성적유효수단；유우도사과립교경，송산도사퇴적체적단축압축과정즉재소성계단후환존재일개탄성경화계단，재저량개계단적전절점상“탄성경화응력”가이간작시도사적“선기고결압력”。
Discontinuous deformation analysis (DDA) is considered to be an efficient way to study deformation behavior of ballast ,in which polygon particles can be easily captured. In this paper ,a new method was proposed to generate polygon particles and was successfully implied in DDA simulation of spontaneous stacking and uniaxial compression process of ballast. T he results demonstrate as follow s :T he spontaneous repose angle of ballast is affected by the angle of friction of particle surfaces ,interlocking effect of particles and the angle of friction between particles and ballast slabs ;the DDA method is a useful method for the investigation of deformation behavior of ballast ;three stages can be identified in compaction of ballast as the elastic ,plastic and elastic hardening stages ,the hardening stress controls the plastic strain and has a function similar to the pre-consolidated stress.