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为了解根系在增强褐色黏土抗剪强度中的作用机理,用室内直剪试验研究了根系复合土的应力—应变及强度特征,探讨了有无根系、根系布置位置、根系布置方式和复合体是否含石下的土体抗剪强度。结果表明:纯细粒土表现为脆性破坏,而根系(面积比率(RAR)为0.07%)加入后,根系复合土出现2个强度峰值表现为延性破坏;根系布置在土体位移开始区更利于固土效果;褐色黏土中散生根系固土效果优于垂直根系的固土效果,其根系复合土比无根土的黏聚力c提高了67%、内摩擦角提高了82%;土体中加入一定量D≤2cm碎石的土壤———根系复合体有利于根系固土效果。
In order to understand the mechanism of root system in enhancing the shear strength of brown clay, the stress-strain and strength characteristics of root composite soil were studied by direct shear test in the interior. The effects of root system, root arrangement, root arrangement and complex Shear strength of soil under rock. The results showed that the pure grain showed brittle failure, while the root (RAR) was 0.07%), the root strength of composite soil appeared ductile damage, and the root arrangement was more favorable in the beginning of soil displacement The results showed that the solidified effect of scattered roots in brown clay was better than that of vertical roots. The cohesion c of root composite soil was 67% higher than that of non-rooted soil, and the internal friction angle increased 82% Add a certain amount of D ≤ 2cm gravel soil - root complex is conducive to root soil fixation effect.