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开展了不同加筋层数、不同压实度、不同含水率的格宾网加筋红砂岩粗粒土大三轴试验,分析格宾网层数、试样含水率和压实度对红砂岩粗粒土应力应变关系、强度和变形特性的影响,引入强度比参数评价加筋效果,并与土工格栅加筋方案进行对比。试验结果表明:格宾网加筋能明显提高红砂岩粗粒土的峰值强度和土体延性;格宾网加筋使红砂岩粗粒土的黏聚力大幅提升,但其内摩擦角提高幅度不大;在同一压实度下,加筋和未加筋土体的黏聚力随含水率变化呈现非线性变化关系,且在最佳含水率附近达到峰值;在同一含水率下,黏聚力和内摩擦角随试样压实度的增加而增大;加筋效果与加筋层数、土体含水率和压实度有关,格宾网加筋的作用发挥随围压增大而减小。
Three large-scale triaxial tests of red sandstone coarse grained soil with different layers of reinforcement, different compaction degrees and different water contents were carried out. The effects of the number of layers of gelatin net, the moisture content of the sample and the compaction degree on the red sandstone Coarse grained soil stress-strain relationship, strength and deformation characteristics of the introduction of strength ratio parameters to evaluate the reinforcement effect, and compared with the geogrid reinforcement program. The test results show that the geogrid reinforcement can significantly increase the peak strength and soil ductility of red sandstone coarse grained soil. The geogrid reinforcement increases the cohesion of red sandstone coarse grained soil significantly, but the increase of internal friction angle And the cohesion of reinforced and unreinforced soils presented a non-linear relationship with the change of water content at the same degree of compaction, and reached the peak near the optimum moisture content. Under the same moisture content, the cohesion The force and internal friction angle increase with the increase of compaction degree. The reinforcement effect is related to the number of reinforcement layers, soil moisture content and compaction degree. Decrease