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在双绞合六边形钢丝网加筋红砂岩粗粒土大三轴试验的基础上,对钢丝网筋材的加筋机理、加筋作用发挥过程和含水量、加筋间距对加筋效果的影响进行系统的研究。分析表明,加筋双绞合六边形钢丝网可以同时提高红砂岩粗粒土的黏聚力和内摩擦角,其加筋机理不宜采用“准黏聚力”理论,工程设计时也应考虑筋材对土体内摩擦角的贡献;双绞合六边形钢丝网的加筋作用发挥有一个过程,只有当土体应变超过临界应变后才能真正起到加强作用;低围压时的加筋效果要比高围压时的加筋效果好,并且低围条件下加筋三层时的效果要比加筋二层发挥得更早,而高围压条件下则刚好相反;含水量和加筋间距对加筋效果有很大的影响,加筋试样的抗剪强度参数c、φ值随含水量的增加而减小,随加筋间距减小而增大;通过多元回归分析得到了c、φ值与含水量和加筋间距的经验公式。
Based on the triaxial test of double-twisted hexagonal wire mesh reinforced red sandstone coarse grained soil, the reinforcement mechanism, the reinforcing effect and the water content of the steel mesh reinforcement were studied. The reinforcement spacing The impact of systematic research. The analysis shows that the reinforcement of twisted hexagonal wire mesh can increase the cohesion and internal friction angle of the red sandstone coarse grained soil at the same time. The reinforcement mechanism should not adopt the theory of “cohesion”, and the engineering design time The contribution of tendons to the friction angle in soil should be taken into consideration; the reinforcing effect of the twisted hexagonal steel mesh has a process that can really play a reinforcing role only when the soil strain exceeds the critical strain; The reinforcement effect is better than the reinforcement effect when the confining pressure is high, and the effect when the three layers are reinforced under the low surrounding conditions is earlier than the reinforced second layer, but the opposite conditions under the high confining pressure; the water content And stiffened spacing have a great influence on the reinforcement effect. The shear strength parameters c and φ of stiffened specimens decrease with the increase of water content and increase with the increase of stiffener spacing. By multivariate regression analysis The empirical formula of c, φ value and water content and reinforcement spacing are obtained.