土工织物加固软土路基的机理分析  

Mechanism of road embankment reinforced with geotextile

作　　者：刘金龙[1] 栾茂田[2] 王吉利[2] 袁凡凡[2] 

机构地区：[1]合肥学院建筑工程系,合肥230022 [2]中国科学院武汉岩土力学研究所

出　　处：《岩土力学》2007年第5期1009-1014,共6页Rock and Soil Mechanics

基　　金：中国科学院武汉岩土力学研究所领域前沿基础研究基金资助项目(No.Q110305)

摘　　要：采用非线性有限元方法对土工织物加固软土路基的效果和机理进行了探讨。对比计算表明,土工织物对软土路基的加固有明显的效果,可使路堤的安全性提高20%以上,使侧向位移减小15%～25%;土工织物对竖向沉降影响的大小则取决于路堤的宽度及土性参数;固结阶段的侧向位移会由于竖向沉降的大幅度发展而发生回缩,工程中需要采用较精密的仪器来探测这种回缩现象;仅铺设土工织物对路基体内孔隙水压力的发展影响不大,若要加快孔压的消散,可与塑料排水板联合使用;为了更好地发挥土工织物的加固效果,土工织物应尽量布置在高应力区域。分析后认为,传统的极限平衡分析方法很难合理地反映土工织物与土之间的变形协调关系,也较难正确地反映土工织物的受力状态及作用机理。The mechanism of road embankment reinforced with geotextile is studied with nonlinear finite element method. By comparative computing of the unreinforced road embankment with reinforced one, it is shown that the road embankment on soft soil foundation can be reinforced with geotextile effectively. The safety of embankment can be enhanced more than 20 ~/60 with geotextile, and the lateral displacement is reduced 15 %--25 %. Whether the vertical settlement could be reduced with geotextile or not, is dependents on the width of road and characteristic of foundation. With vertical settlement develops greatly, the lateral displacement at consolidation phase become less than that of construction phase. More exact instrument should be used to investigate the variation of lateral displacement at different construction phases. It is shown that there is no influence on dissipation of excess pore water pressure with geotxtile only. In order to reinforce the embankment effectively, it is advised that geotextile should be set on high-stress zone. Furthermore, the limitation of conventional limit equilibrium method used in investigating embankment reinforced with geotextile is analyzed.

关 键 词：非线性有限元 土工织物 软土路基 沉降 稳定性分析 

分 类 号：TU452[建筑科学—岩土工程]