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基于三轴剪切试验对加筋膨胀土的强度特性进行研究,得出加筋土与对应素土的强度指标关系,分析了加筋土强度的提高宏观表现;结合不同层数加筋土体的应力应变关系及加筋土等效围压分析原理,分析了基于筋材断裂的加筋膨胀土的强度特性,得出不同加筋层数筋材刚断裂时应力莫尔圆应相切于同一条直线,随着轴向压力的增加,多层加筋膨胀土试验筋材逐层断裂,应力莫尔圆向外扩展,表明多层加筋膨胀土的强度逐渐增大,而且试验表明对于柔性筋材,多层加筋土体的强度包络线基本平行,加筋土体强度的增加,只是粘聚力c的增加引起的。
Based on the triaxial shear test, the strength characteristics of reinforced expansive soils were studied. The relationship between the strength index of reinforced soils and the corresponding plain soils was obtained, and the macroscopic behavior of the reinforced soils was analyzed. The relationship between stress and strain and the theory of equivalent confining pressure of reinforced earth are analyzed. The strength characteristics of reinforced expansive soil based on tendon fracture are analyzed. It is concluded that the stress Moire circle should be tangent to The same straight line, with the increase of axial pressure, multi-layer reinforced expansive soil test tendons layer by layer rupture, stress Mohr circle outward expansion, indicating that the strength of multi-layer reinforced expansive soil gradually increased, and tests show that for Flexural reinforcement, multi-layer reinforced soil strength envelope is basically parallel, reinforced soil strength increases, but the cohesion c caused by an increase.