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| 土工织物加固软土路基的机理分析 | |
| 引用本文： | 刘金龙,栾茂田,王吉利,袁凡凡.土工织物加固软土路基的机理分析[J].岩土力学,2007,28(5):1009-1014. |
| 作者姓名： | 刘金龙 栾茂田 王吉利 袁凡凡 |
| 作者单位： | 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,武汉,430071;大连理工大学,土木水利学院岩土工程研究所,大连,116024 3. 中国科学院武汉岩土力学研究所,武汉,430071 |
| 基金项目： | 中国科学院前沿领域研究基金 |
| 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。 |
| 关 键 词： | 非线性有限元 土工织物 软土路基 沉降 稳定性分析 |
| 文章编号： | 1000-7598-（2007）05-1009-06 |
| 收稿时间： | 2006-02-14 |
| 修稿时间： | 2006-02-14 |
Mechanism of road embankment reinforced with geotextile |
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| LIU Jin-long,LUAN Mao-tian,WANG Ji-li,YUAN Fan-fan.Mechanism of road embankment reinforced with geotextile[J].Rock and Soil Mechanics,2007,28(5):1009-1014. | |
| Authors: | LIU Jin-long LUAN Mao-tian WANG Ji-li YUAN Fan-fan |
| Institution: | 1. Department of Civil Engineering, Hefei University, Hefei 230022, China; 2. Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; 3. Institute of Geotechnical Engineering, School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China |
| Abstract: | 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. |
| Keywords: | nonlinear finite element method geotextile soft soil foundation settlement stability analysis |
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