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Experimental Investigation on Mechanical Behavior of a Hexagonal-Wire-Reinforced Granular Soil

机译:六角钢丝增强颗粒土力学行为的试验研究

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摘要

The use of hexagonal wire reinforcements to mechanically stabilize the earth works is a recent technique in reinforced soil construction. However, few studies have investigated the mechanical behavior of this kind of reinforced granular soil through large-scale triaxial tests. In this paper, a series of large-scale laboratory unconsolidated undrained triaxial tests were performed on specimens of hexagonal wire reinforced red-sandstone granular soil, and the results were compared to the unreinforced samples to evaluate how the number of hexagonal wire reinforcing layers, water content and degree of compaction affect the measured strength and deformation characteristics of red-sandstone granular soil. The behaviors of hexagonal wire reinforced red-sandstone granular soil were discussed in terms of stress-strain relationship, peak stress strength characteristics, critical strength properties, reinforcement strength ratio coefficient and reinforced mechanism analysis. The failure shapes and the two reinforcement-soil interaction mechanisms of the specimens were revealed. The experimental results show that hexagonal wire mesh reinforcement has an obvious improvement in both strength and deformation of red-sandstone coarse-grained soil, especially under lower confining pressure. In addition, the hexagonal wire mesh reinforcements give an apparent cohesion force to the soil, whereas displaying only a slight increase in the frictional angle. The vertical separation of 20 cm between the reinforcing layers is suitable, and it is suggested that the water content of the red-sandstone granular soil fillings should not exceed the optimum water content and the compaction should not be less than 90%.
机译:使用六角形钢丝增强材料机械稳定土方工程是增强土壤施工中的最新技术。但是,很少有研究通过大规模的三轴试验研究这种加筋颗粒状土的力学性能。本文对六角形钢丝增强的红砂岩颗粒状土样进行了一系列的大型实验室不固结不排水三轴试验,并将结果与​​未加强的样品进行比较,以评估六角形钢丝增强层,水的数量含量和压实度会影响测得的红砂岩粒状土的强度和变形特性。从应力-应变关系,峰值应力强度特性,临界强度特性,增强强度比系数和增强机理分析等方面讨论了六角形钢丝增强红砂岩颗粒土的行为。揭示了试件的破坏形态和两种土-土相互作用的机理。实验结果表明,六角网增强对红砂岩粗粒土的强度和变形均有明显改善,特别是在较低围压下。另外,六角形金属丝网增强物使土壤具有明显的内聚力,而摩擦角仅略有增加。加强层之间的垂直间距为20 cm是合适的,建议红砂岩颗粒状土壤填料的含水量不应超过最佳含水量,压实度不应小于90%。

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