To study the effect of three-dimensional reinforcement arrangement on the behavior of a gravelly sand, triaxial tests were performed on specimens reinforced with geogrid sheet, geogrid cell, and one and two layers of geogrid sheet and geocell combination. Specimens with a diameter of 100 mm and a height of 200 mm are sheared under drained condition to monitor the variation of axial and volumetric strains with axial loading under different confining pressures. The results showed that the reinforcement schemes have different effects on soil strength improvement. The inclusion of double layers of geogrid sheet and geocell reinforcement could increase both the apparent cohesion and friction of the reinforced soil. The stress-strain relationship could be modelled with a modified hyperbolic model, which can capture the softening strain behavior of the specimens after peak strength.

中文翻译：

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不同形式加固的砂砾石的三轴剪切行为

为了研究三维加固布置对砾石砂性能的影响，对土工格栅板，土工格室以及一层和两层土工格栅板和土工格室组合的钢筋进行了三轴试验。在排水条件下剪切直径为100 mm，高度为200 mm的试样，以监测在不同围压下轴向和体积应变随轴向载荷的变化。结果表明，加固方案对提高土壤强度有不同的影响。土工格栅板和土工格室加筋的双层包含可以增加加筋土的表观内聚力和摩擦力。应力-应变关系可以用修正的双曲线模型来建模，