CAJ | 학술논문

建立桩网结构路基的离散元模型，从散粒体和微观角度研究了桩网结构路基中的土拱效应。结果表明：土拱效应随着桩间土的沉降而发展变化，桩间土发生较大的沉降后土拱效应才能达到极限状态。桩顶平面上方1.67倍桩净间距范围内土体的密实度受土拱效应的影响，土体孔隙率的变化与土拱效应发展保持一致。土拱效应发展过程中土体的竖向位移远大于水平向位移，桩顶上方竖向位移小于桩间土上方竖向位移，等沉面的高度位于2.7倍的桩净间距处。土体中竖向应力的影响范围与密实度的影响范围相同，土拱高度为该影响范围的上限，在该范围内土压力系数随土拱效应发展而变化，但两者变化并不一致，且土压力系数在桩顶上方和桩间土上方也不相同。
건립장망결구로기적리산원모형，종산립체화미관각도연구료장망결구로기중적토공효응。결과표명：토공효응수착장간토적침강이발전변화，장간토발생교대적침강후토공효응재능체도겁한상태。장정평면상방1.67배장정간거범위내토체적밀실도수토공효응적영향，토체공극솔적변화여토공효응발전보지일치。토공효응발전과정중토체적수향위이원대우수평향위이，장정상방수향위이소우장간토상방수향위이，등침면적고도위우2.7배적장정간거처。토체중수향응력적영향범위여밀실도적영향범위상동，토공고도위해영향범위적상한，재해범위내토압력계수수토공효응발전이변화，단량자변화병불일치，차토압력계수재장정상방화장간토상방야불상동。
Soil arching in pile supported geosynthetic-reinforced embankment is studied from granular and microcosmic viewpoint by using discrete element program. It indicates that soil arching develops with the settle-ments of soil between piles and it needs large settlement for soil arching to get ultimate state. Soil arching has an influence on soil density degree above pile within 1 . 67 times of clear pile spacing and the variation of porosity brings into correspondence with development of soil arching. The vertical displacements of soil are largely greater than horizontal displacements and vertical displacements of soil above piles are greater than that above soil be-tween piles. The height of plane which settlements of soil are equal is 2. 7 times of clear pile spacing and the height of soil arching is upper limit of scope which soil density degree and vertical stress are affected. The soil pressure coefficient, below the height of soil arching, varies with development of soil arching but the variation of them is inconsistent and soil pressure coefficients above pile and soil between piles are not equal.