CAJ | 학술논문

网格状带齿加筋是一种新型的土工加筋技术，汲取了传统网格状与条带式带齿加筋的优点，其筋土界面特性是加筋结构设计的基础。利用室内拉拔试验从宏观角度分析筋材与土的界面特性，结合颗粒流程序，筋材用平行黏结模拟，从细观角度分析筋土接触界面的产生和发展演化规律。数值结果表明：齿筋的存在对界面处颗粒的移动及剪切带的宽度影响显著，其破坏模式呈现波浪型，在齿筋附近出现应力集中现象。筋土界面处筋材与土颗粒摩擦、咬合和阻抗作用提供“似黏聚力”是改变网格状带齿加筋体系作用机制的内在原因。研究成果对于明确网格状带齿加筋拉拔的机制及模型的建立都具有意义。
망격상대치가근시일충신형적토공가근기술，급취료전통망격상여조대식대치가근적우점，기근토계면특성시가근결구설계적기출。이용실내랍발시험종굉관각도분석근재여토적계면특성，결합과립류정서，근재용평행점결모의，종세관각도분석근토접촉계면적산생화발전연화규률。수치결과표명：치근적존재대계면처과립적이동급전절대적관도영향현저，기파배모식정현파랑형，재치근부근출현응력집중현상。근토계면처근재여토과립마찰、교합화조항작용제공“사점취력”시개변망격상대치가근체계작용궤제적내재원인。연구성과대우명학망격상대치가근랍발적궤제급모형적건립도구유의의。
Sandy soil reinforced with denti-inclusions is a new concept of reinforced soil. In the grid with denti-inclusions, besides the conventional latticed inclusions, vertical reinforced elements are also placed in the soil. The behavior of interface between soil and geosynthetics is a significant factor for analysis and design of reinforced earth structures which is simplified as pullout performance. This paper presents the results of pullout tests and numerical simulation aimed at studying the interaction mechanism of reinforced sand. The pullout test is carried out to study the macroscopic mechanism. PFC is adopted to simulate pullout tests and the interface between geosynthetics and sand with emphasis on the meso-analysis. On such a basis, the model of PFC is established by using parallel-bond model to simulate the reinforcement. The sand particle movement trajectory and the particle contact orientations are studied. The results show that the shear bond is influenced by the denti-inclusions and the stress concentration occurs nearby the denti-inclusions. The intrinsic factors which form and change the mechanism of the interface properties are the“cohesion”provided by friction, occlusive force and passive resistances. The study results can provide a new understanding for future studies on the mechanism of the reinforced interface.