CAJ | 학술논문

颗粒体系在受挤压时的受力情况和滑移通道是一个极其复杂的问题。用实验的方法研究了二维晶格堆积的颗粒体系受挤压推进过程中的力学响应和结构变化情况，观察到颗粒体系在受挤压时将出现结构的坍塌和重组行为。依据实验结果，分析了边界上压力的分布、滑移通道和重组结构与边界摩擦因素和堆积角之间的关系；用静力学理论分别讨论了处于边界和中部颗粒不同的受力机制。研究表明光滑器壁较粗糙器壁容易成为颗粒滑移的通道，这种情况下颗粒体系形成的力链不稳定，容易导致结构坍塌；边壁的摩擦不会对器壁不同高度处应力的分布产生显著影响，力链的重组才是导致不同高度处应力重新分布的主要因素。
과립체계재수제압시적수력정황화활이통도시일개겁기복잡적문제。용실험적방법연구료이유정격퇴적적과립체계수제압추진과정중적역학향응화결구변화정황，관찰도과립체계재수제압시장출현결구적담탑화중조행위。의거실험결과，분석료변계상압력적분포、활이통도화중조결구여변계마찰인소화퇴적각지간적관계；용정역학이론분별토론료처우변계화중부과립불동적수력궤제。연구표명광활기벽교조조기벽용역성위과립활이적통도，저충정황하과립체계형성적력련불은정，용역도치결구담탑；변벽적마찰불회대기벽불동고도처응력적분포산생현저영향，력련적중조재시도치불동고도처응력중신분포적주요인소。
The force situation and sliding channel are very complicated when particle system is squeezed.The mechani-cal response and structure changes of two-dimensional lattice pile system of granular material in the process of being pressed were experimentally investigated.The structure collapse and self-organization behavior of the particle system were observed when being squeezed.Based on the experimental results,the relationship between the horizontal pressure distribution,the sliding channel or the reorganization structure and the stacking angle as well as the boundary friction factor was discussed.According to the theory of statics,different force mechanisms about the boundary particle and the central one were analyzed.Studies have shown that compared with rough wall,smooth wall is easier to become a slid-ing channel for particles,so the force chain formed by the particles is unstable,which means it will easily lead to struc-tural collapse.The friction factor on side wall wouldn’t have a significant impact about the stress distribution at different heights.In fact,the recombination of force chain is the main factor leading to stress redistribution at different heights.