土工袋挡墙作为一种新型加筋土挡墙,已被广泛应用于水利、交通、建筑等各类工程的支挡结构。针对其工作环境多变的特点,运用岩土工程有限元分析软件GTS(Geotechnical and Tunnel analysis System)研究了土工袋挡墙在不同工况下的变形特性。研究结果表明挡墙坡度、高宽比以及填土表面荷载强度对于土工袋挡墙变形特性具有重要影响:坡度决定了土工袋挡墙的变形形态和变形转折点的位置范围,随着坡度变小,墙顶水平位移迅速减小;高宽比越小,墙面变形量越小,且挡墙坡度越大,减小高宽比对限制墙面弯曲变形的效果越好;填土表面荷载强度越大,墙面弯曲变形越大,墙面变形转折点位置随着填土表面荷载的增大在一定变化范围内逐渐上移。由结果可知,坡度决定挡墙变形形态,而高宽比及填土荷载影响主要墙面变形量。
Abstract
As a new type of reinforced retaining structure, retaining wall constructed with geobags has been widely used in a variety of engineering fields, such as water conservancy, communication and construction, which contributes to complex and varied working conditions. The finite element software GTS is used to study the deformation behavior of retaining wall constructed with geobags under different conditions. The simulation results show that slope gradient, height-width ratio, and surface load have great effects on the deformation behavior. Slope gradient determines the shape of deformation and the location of turning point on deformation curve. When slope gradient decreases, the horizontal displacement at the top of retaining wall shrinks rapidly. Lower height-width ratio results in less deformation, and such effect of the decrease of height-width ratio intensifies when slope gradient gets larger. With the increase of surface load, flexural deformation intensifies and the turning point gradually moves upward within a certain range. In conclusion, the deformation shape of retaining wall is determined by slope gradient, while deformation amount is affected by height-width ratio and surface load.
关键词
土工袋挡墙 /
变形特性 /
有限元 /
坡度 /
高宽比 /
填土表面荷载
Key words
retaining wall constructed with geobags /
deformation behavior /
FEM /
slope gradient /
height-width ratio /
surface load
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