| 土工格栅加固膨胀土路堤边坡稳定性的试验分析 |
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| 作者单位： | ;1.西南交通大学地球科学与环境工程学院;2.西南交通大学土木工程学院 |
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| 摘 要： | 利用离心试验和数值模拟方法研究土工格栅加固膨胀土路堤边坡稳定性效果并给出设计参数。对不同加筋方案(竖直间距0.5、1 m)与不加筋的膨胀土路堤边坡位移的分析结果表明:(1)中心填高为10.9 m、坡率为1∶1.5的素膨胀土路堤边坡在自然状态下不稳定;(2)对于整体稳定性好,仅存在浅层破坏的膨胀土路堤,铺设长度为4 m,间距为0.6~0.8 m的土工格栅可保证路堤稳定性;(3)对于存在整体稳定性问题的路堤边坡,需加长土工格栅长度或采用通长配筋方法提高路堤边坡稳定性。土工格栅对膨胀土路堤边坡的稳定性提高有显著作用,是有效的措施。
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| 关 键 词： | 膨胀土路堤 土工格栅 离心试验 数值模拟 |
Experimental Analysis of Embankment Slope of Expansive Soil Strengthened by Geogrid |
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| Affiliation: | ,Faculty of Geosciences and Environmental Engineering of Southwest Jiaotong University,School of Civil Engineering,Southwest Jiaotong University |
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| Abstract: | Centrifuge tests and numerical simulation method are used to study the stability of embankment of expansive soil strengthened by geogrid and obtain design parameters for different failure modes of the embankment slopes. The research results with different reinforcing programs( vertical interval 0. 5 m and1m) show that( 1) where the center banking is 10. 9 m with slope ratio 1 ∶ 1. 5,the non reinforced embankment tends to be unstable under natural conditions;( 2) when the slope only has shallow failure problem,the stability can be guaranteed by laying 4 meter length and 0. 6 ~ 0. 8 meter interval geogrid;( 3) when the slope has overall stability problem,only the geogrid is extended or in full length,the stability of the embankment slope can meet the requirement. Geogrid is effective in reinforcing the road embankment and will be used in the practical engineering widely. |
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| Keywords: | Expansive soil embankment Geogrid Centrifuge test Numerical simulation |
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