Soft soil has low shear strength and its density is high;construction of embankments on them would cause problems such as large and non-uniform subsidence. One way to avoid these subsidence is using of geo-grid combin...Soft soil has low shear strength and its density is high;construction of embankments on them would cause problems such as large and non-uniform subsidence. One way to avoid these subsidence is using of geo-grid combined with cement and lime columns. Geo-grids due to their tensile strength, and cement and lime columns due to their bearing capacity and their body friction, reduce embankment subsidence. Extensive researches have been done in order to reduce the subsidence of the embankments located on the roads, but few studies have being done about the inclined embankments on soft soil layers. In this paper, the road embankment has been located on inclined soft soil layers;the study will try to reduce embankment subsidence and uniform them using geo-grid combined with cement and lime column subsidence. The results show that the realization of this issue will cause subsidence reduction and uniformity in the embankment surface.展开更多
与普通土工格栅相比,竹筋格栅有低碳、环保、经济等优点。结合室内测试天然竹筋抗拉、弯曲、压缩等材料特性成果,先根据规范要求指标对竹筋格栅和普通土工格栅的力学特性进行了对比。然后测试了三轴条件下石渣填料素土和竹筋土的力学特...与普通土工格栅相比,竹筋格栅有低碳、环保、经济等优点。结合室内测试天然竹筋抗拉、弯曲、压缩等材料特性成果,先根据规范要求指标对竹筋格栅和普通土工格栅的力学特性进行了对比。然后测试了三轴条件下石渣填料素土和竹筋土的力学特性,开展了竹片抗拔试验研究筋土界面特性。三轴试验结果表明,相同围压和轴向应变下,竹筋土的主应力差(σ1-σ3)f较素土有明显增大;围压较小时,破坏主应力差增大明显,如σ3=100 k Pa时,增长值为50.8%;随着围压增大,增长值逐渐减小,即加筋效果逐渐减弱,如σ3=600 k Pa时,增长值为9.4%;素土和竹筋土的内摩擦角均接近35.7°,素土粘聚力为25 k Pa,竹筋土粘聚力为82k Pa,粘聚力增幅57 k Pa。抗拔试验表明,破坏力随着法向力的增大呈线性增大,似摩擦系数随着法压力增大略微减小,平均值为0.35。测试分析表明,竹筋格栅力学特性能达到规范对普通土工格栅的要求,且竹筋格栅已应用于巴南高速公路软基加固。展开更多
文摘Soft soil has low shear strength and its density is high;construction of embankments on them would cause problems such as large and non-uniform subsidence. One way to avoid these subsidence is using of geo-grid combined with cement and lime columns. Geo-grids due to their tensile strength, and cement and lime columns due to their bearing capacity and their body friction, reduce embankment subsidence. Extensive researches have been done in order to reduce the subsidence of the embankments located on the roads, but few studies have being done about the inclined embankments on soft soil layers. In this paper, the road embankment has been located on inclined soft soil layers;the study will try to reduce embankment subsidence and uniform them using geo-grid combined with cement and lime column subsidence. The results show that the realization of this issue will cause subsidence reduction and uniformity in the embankment surface.
文摘与普通土工格栅相比,竹筋格栅有低碳、环保、经济等优点。结合室内测试天然竹筋抗拉、弯曲、压缩等材料特性成果,先根据规范要求指标对竹筋格栅和普通土工格栅的力学特性进行了对比。然后测试了三轴条件下石渣填料素土和竹筋土的力学特性,开展了竹片抗拔试验研究筋土界面特性。三轴试验结果表明,相同围压和轴向应变下,竹筋土的主应力差(σ1-σ3)f较素土有明显增大;围压较小时,破坏主应力差增大明显,如σ3=100 k Pa时,增长值为50.8%;随着围压增大,增长值逐渐减小,即加筋效果逐渐减弱,如σ3=600 k Pa时,增长值为9.4%;素土和竹筋土的内摩擦角均接近35.7°,素土粘聚力为25 k Pa,竹筋土粘聚力为82k Pa,粘聚力增幅57 k Pa。抗拔试验表明,破坏力随着法向力的增大呈线性增大,似摩擦系数随着法压力增大略微减小,平均值为0.35。测试分析表明,竹筋格栅力学特性能达到规范对普通土工格栅的要求,且竹筋格栅已应用于巴南高速公路软基加固。
