CAJ | 학술논문

通过plaxis8.5有限元软件,研究大主应力偏转角度的变化,模拟出有无土工格栅时土拱效应的形成及变化规律,分析了填土高度、桩间距、填土的力学参数和本构模型对土拱效应的影响。研究表明：格栅的作用是减弱土拱效应和其本身张拉膜效应以及与垫层之间的摩擦咬合三种作用的叠加;路堤填土的塑性是产生土拱的又一条件;主应力偏转发生在填土初期,达到一定高度时拱达到稳定,且拱轴线并不是由桩顶直接出发,而是在桩顶形成抛物面形的应力核区,拱上应力偏转大致垂直于此抛物面。
통과plaxis8.5유한원연건,연구대주응력편전각도적변화,모의출유무토공격책시토공효응적형성급변화규률,분석료전토고도、장간거、전토적역학삼수화본구모형대토공효응적영향。연구표명：격책적작용시감약토공효응화기본신장랍막효응이급여점층지간적마찰교합삼충작용적첩가;로제전토적소성시산생토공적우일조건;주응력편전발생재전토초기,체도일정고도시공체도은정,차공축선병불시유장정직접출발,이시재장정형성포물면형적응력핵구,공상응력편전대치수직우차포물면。
Through the plaxis 8.5,the changes of principal stress angle are studied,the forming process and change rules of the soil arching effect whether there is geogrid loading or not are simulated,and the influencing factors to soil arch,such as the height of fill,the space between piles,the mechanical parameters and constitutive model of fill,are analyzed.The study results show that geogrid is the composition result of three effects,such as the geomembrane effect itself,decreased soil arching effec and the friction occlusion effect between cushionlayer and geomembrane itself;The plasticity of embankment filling is another condition for generating soil arch;The principal stress deflection occurs in its early stage,when reaching to a certain height,the deflection angle is unchanged,and the arch becomes stable.In addition,the arch axis does not set out directly from the pileblock,by contrast,the stress area of paraboloid is shaped on the pileblock,and the stress deflection on the arch is approximately perpendicular to the paraboloid.