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麦秸秆按形状不同分为圆管状、1/2圆管状及纯茎节状,通过直剪试验和无侧限抗压强度试验比较了不同形状麦秸秆加筋土抗剪强度和无侧限抗压强度的变化规律。试验结果表明:1圆管状与1/2圆管状麦秸秆均可提高上海粘土的强度,直剪试验的最佳加筋率在0.2%~0.3%之间,无侧限抗压强度的最佳加筋率在0.1%~0.2%之间;21/2圆管状麦秸秆的加筋效果优于圆管状麦秸秆,麦秸秆茎节在一定程度上会降低土体的强度;3无茎节麦秸秆加筋上海粘土可以显著提高素粘土的黏聚力,但对于内摩擦角影响较小。文章还阐述了不同形状麦秸秆加筋土强度变化的作用机理,可为麦秸秆加筋土合理形状的选择提供借鉴。
The wheat straw was divided into round tubular shape, round tubular shape and pure stem shape according to the shape. The shear strength and unconfined resistance of wheat straw reinforced soil with different shapes were compared by direct shear test and unconfined compressive strength test Pressure intensity changes. The results show that the strength of Shanghai clay can be increased by 1 round tube and 1/2 round tubular wheat straw. The best reinforcement ratio of direct shear test is between 0.2% and 0.3%, and the unconfined compressive strength is the best The reinforcement ratio is between 0.1% and 0.2%; the reinforcement effect of 21/2 round tubular wheat straw is better than that of round tubular wheat straw, and the stalk of wheat straw will reduce the soil strength to a certain extent; Straw-reinforced Shanghai clay can significantly improve the cohesion of the plain clay, but has little effect on the internal friction angle. The paper also expounds the mechanism of strength change of wheat straw reinforced earth with different shapes, which can provide reference for the selection of reasonable shape of wheat straw reinforced earth.