土工格栅返包加固充砂袋围堤的变形力学特性研究

Study on the Deformation and Mechanical Properties of Geogrid-Reinforced Sandbag Revetments

为了进一步了解土工格栅加固砂袋围堤的变形力学特性,设计并开展了未使用土工格栅加固(without geogrid reinforcement,NGR)和土工格栅返包加固(geogrid reinforcement,GWR)的模型试验,对比分析围堤中土工合成材料的应变变化;通过拟合试验数据,建立了土工格栅和砂袋应变的理论公式,并构建了土工格栅返包加固砂袋围堤的变形力学模型,推导出围堤沉降、土工格栅应变与应力、砂袋应变与应力之间的函数关系式。研究结果表明:土工格栅返包加固砂袋后,可显著降低砂袋的应力水平,且土工格栅的应力远大于纱布的应力,砂袋荷载主要由土工格栅分担;理论建立的变形力学模型经试验验证,具有高度的准确性。应用此变形力学模型,不仅能对围堤加固工程进行实时监测,还能提高围堤结构安全管理的科学化与精细化水平。

To advance the understanding of the deformation mechanics in geogrid-reinforced sandbag embankments,a series of model tests were conducted,comparing embankments without geogrid reinforcement(NGR)and those with geogrid wrapping reinforcement(GWR).The strain variations in the geosynthetics within the embankments were analyzed.Based on the experimental data,theoretical strain equations for both the geogrid and sandbags were established.A deformation mechanics model was subsequently developed for GWR-reinforced embankments,from which functional relationships between embankment settlement,geogrid strain and stress,and sandbag strain and stress were derived.The results indicate that GWR significantly reduces the stress levels in sandbags,with the geogrid experiencing considerably higher stress than the gauze,effectively bearing the majority of the embankment's load.The proposed deformation mechanics model was validated through experimental tests,demonstrating a high degree of accuracy.The application of this model enables real-time monitoring of embankment reinforcement projects,contributing to more precise and scientifically informed safety management of embankment structures.