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摘要: 采用土工格室加筋垫层提高软土地基上填方路堤的稳定性已得到认可，但其破坏模式和稳定性分析方法仍未取得共识。作者通过室内物理模拟试验，识别软土地基上无筋垫层路堤、土工格栅加筋垫层路堤和土工格室加筋垫层路堤的失效模式，并在此基础上探讨土工格室加筋垫层路堤的稳定性和临界填筑高度分析方法。研究结果表明：软土地基上无筋垫层路堤和土工格栅加筋垫层路堤发生穿过垫层的圆弧滑动破坏；土工格室加筋垫层路堤呈整体破坏模式，滑动面虽呈似圆弧状但未穿过加筋垫层，破裂面在软土地基中形成和发展，而且位置更深。在识别破坏模式的基础上，通过土工格室加筋垫层的工作机理分析，提出了软土地基上土工格室加筋垫层路堤稳定性和临界填筑高度分析方法。Abstract: Using geocell-reinforced cushion to improve the stability of embankment over soft soils has been recognized, but researchers has not had consensus for the failure mode and stability evaluation method. The reinforcement effect and failure mode of embankment over soft soils are compared through three sets of physical simulation tests using non-reinforced, geogrid-reinforced and geocell-reinforced cushion. The results show that the failure modes of non-reinforced and geogrid-reinforced cushion embankment are circular slip failure. However, as for the geocell-reinforced cushion embankment, the sliding surface is in the form of an arc passing through the center of embankment bottom and all formed in the soft soils, not passing through the reinforced cushion and embankment fill, and its location is deeper than that of the other two groups. Based on the test results, the mechanism of improving the stability of embankment by using geocell-reinforced cushion is summarized. In addition, on the basis of the identification of failure mode, the evaluation method of stability and the limit filling height of geocell-reinforced cushion embankment over soft soils are deduced.
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Key words:
- soft soils /
- reinforced cushion embankment /
- failure mode /
- geocell /
- stability
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