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土工格栅加筋膨胀土路堤或路堑、渠坡已在公路、铁路与水利工程中获得成功应用,但目前对加筋膨胀土的强度与变形特性的研究还较少。对不同方案加筋(水平1层加筋、水平3层加筋、竖向加筋)与不加筋的膨胀土样在不同围压下的三轴排水剪切试验结果的分析表明,(1)土工格栅加筋膨胀土形成排水通道,加速土体的排水固结,有利于膨胀土坡的稳定;(2)土工格栅加筋膨胀土一般呈应变硬化特征;(3)土工格栅的植入使剪切带的发展受到抑制,导致破坏模式变化;(4)加筋使膨胀土的内摩擦角变化不大,而黏聚力则有明显提高,其提高程度从小到大依次为水平1层加筋、水平3层加筋和竖向加筋;(5)采用加筋效果系数R评价,除了水平1层加筋方式的效果有所降低外,其余加筋方式都表现出加筋比不加筋的效果要好,其中以竖向加筋的效果最好。
Geogrid reinforced expansive soil embankment or cutting, drainage slope has been successfully used in highway, railway and water conservancy projects, but at present the research on the strength and deformation characteristics of reinforced expansive soil is still less. The results of triaxial drainage shear tests under different confining pressure of different schemes of reinforcement (horizontal 1-layer reinforced, horizontal 3-layer reinforced, vertical reinforced) and non-reinforced expansive soil samples show that (1 ) Geogrid reinforced expansive soil to form a drainage channel to accelerate soil consolidation, is conducive to the stability of expansive soil slope; (2) Geogrid reinforced expansive soil is generally characterized by strain hardening; (3) geogrid (4) The internal friction angle of the expansive soil did not change much while the cohesion of the expansive soil increased obviously. The increasing degree of the expansive soil was Level 1 reinforced, level 3 reinforced and vertical stiffened; (5) The reinforcement effect coefficient R evaluation, in addition to the level of the first layer of reinforced the effect has been reduced, the rest of the reinforced way showed The effect of reinforcement is better than no reinforcement, of which the best vertical reinforcement.