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土工格栅加固浅层软土地基的有限元分析

, PP. 6-11

Keywords: 道路工程,软土地基,有限元分析,土工格栅,分级加载

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Abstract:

?为了评价土工格栅加固浅层软土地基的效果,对公路软土地基稳定性进行现场监测,通过试验确定土和格栅的计算参数;运用有限元理论,研究浅层软土地基在分级加载情况下的稳定性,并分析格栅加筋效果的影响因素。结果表明:理论计算的侧向位移值和竖向位移值与现场观测结果基本吻合;铺设格栅能有效地控制软土地基的侧向位移,而对减少路堤的竖向位移效果不明显;随着路堤填土的增加,土工格栅的拉力逐渐增加,并且格栅拉力的峰值有逐渐向路基中线方向移动的趋势;加筋模量增大,格栅对坡脚下各点侧向位移的约束作用增强,对路堤底部沉降的变化没有影响;铺设多层格栅比铺设1层处理效果好,但不显著;如果只铺设1层土工格栅,那么在软土地基表面铺设对侧向位移约束的效果最好。

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