摘要
采用非线性有限元方法，对土工织物能否减少软弱路基的竖向沉降量进行了探讨。对比计算表明：当路堤宽度较小时，土工织物的加筋作用使路堤体内的竖向位移速度场减小，从而可使竖向沉降量减少12％～16％，并可使路堤的稳定性提高达20％；当构筑物宽度较大时，土工织物对构筑物体内竖向沉降量的影响不大，即土工织物的加筋作用存在尺寸效应。因此，工程实际中应根据具体情况判断是否选用土工织物来改善构筑物的竖向沉降。分析表明：传统的极限平衡法来考察土工织物加固软土工程的稳定性时，由于存在诸多假定而导致该方法不能很好的反映土工织物与土之间的变形协调关系。故应发展非线性有限元方法来模拟土工织物与土之间的相互作用关系。
The influence of geotextile on vertical settlement of road embankment is studied with nonlinear finite element method. By comparative computing of the unreinforced road embankment with reinforced one, it is shown that road embankment on soft soil foundation can be reinforced with geotextile effectively when the width of road is small. With that conditions, the vertical increment displacement can be reduced with geotextile, and the vertical displacement can be decreased 12% -16%, the stability of road can be increased more than 20%. While the width of road increased, the influence of geotextile on the vertical settlement of road embankment decreased, which regarded as dimension effect. Therefore, whether geotextile can minish vertical settlement of road embankment or not should be analyzed with reality condition. Furthermore, the limitation of conventional limit equilibrium method in studying embankment reinforced with geotextile is analyzed. It is necessary to develop nonlinear finite element method in studying on the interaction of soil and geotextile.
出处
《岩土工程技术》
2006年第2期84-87,共4页
Geotechnical Engineering Technique
基金
湖北省交通科技项目"高等级公路软弱路基处理方法与变形机理研究"(鄂交科教[2004]51号文)
关键词
非线性有限元
极限平衡法
土工织物
软土路基
加筋路堤
竖向沉降
nonlinear finite element method
limit equilibrium method
geotextile
soft soil foundation
reinforced road em- bankment
vertical settlement
