摘要
土钉墙是粉砂土、黏性土等地区基坑开挖围护的主要形式之一。采用ABAQUS有限元软件建立土钉—面层—土体的相互作用模型,土体应用Mohr-Coulomb本构模型,土体与土钉间的接触性质为摩擦小滑移,在此基础上,得到了土体深层水平位移、面层位移、面层土压力和土钉轴力的分布形式和基本规律。计算结果表明:深层土体水平位移的最大值发生在墙顶靠下或者墙顶的位置;坑底水平位移从坡脚向坑中逐渐变小,在基坑开挖深度范围内,减小的速率较大,以后趋于某一稳定值;土钉轴力两头较小,中间较大,作用在面层上的作用力值远小于土钉轴力,该力与作用在面层上的作用力之和等于土钉轴力;土钉墙的面层土压力随着深度的增加,先增加到最大值后,再逐渐减小,每开挖一步面层土压力就会增加,且最大值向下移动。
Soil-nailing walls are main support structures in silty and clay soils.Calculated modes interacted between soils,shot crete layers and soil nail are set up on the basis of ABAQUS FEM software by employing soil constitutive model of Mohr-Coulomb and compact pattern of small slip.Distribution patterns and regularities of horizontal displacements of soils and shotcrete layers,shotcrete layer pressures and axial forces are explored.The results show the maximum value of soil displacements is at or near top of walls.Horizontal displacement of pit bottom decreases from pit base to middle pit,and trends to be a fixed value gradually.Axial forces reach maximum in the middle of the nails,and shotcrete layer pressure is much smaller than that of axial nail value.The pressures of the shotcrete layers of soil-nailing walls increase with depth,reach the maximum values,and then decrease afterward.The pressure is added to shotcrete layers with each excavation,and the position of the maximum value moves downward gradually.
出处
《岩土力学》
EI
CAS
CSCD
北大核心
2009年第S2期528-531,共4页
Rock and Soil Mechanics
关键词
土钉墙
面层
位移
soil-nailing wall
displacement
