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盐胀、溶陷和吸湿软化等不良特性,易引起滨海盐渍土的低强度和大变形问题。以麦秸秆作加筋材料,可以实现提高盐渍土的抗剪强度和抗变形性能的目的。为测试麦秸秆加筋土的抗剪强度,完成了麦秸秆与盐渍土的界面直剪摩擦试验。水平铺设麦秸秆,以含水率、干密度、加筋间距、麦秸秆有无茎节为条件,分析四种制样条件对筋土界面抗剪强度的影响。鉴于整个剪切界面上存在筋/土和土/土的两种摩擦作用形式,因此将其称为界面综合抗剪强度。试验结果显示:界面综合粘聚力和界面综合内摩擦角均随含水率和加筋间距的增大而逐渐减小,随着干密度的增大逐渐增大,且有茎节的大于无茎节的。研究证实了剪切界面上存在着筋/土和土/土两种摩擦作用,两者共同发挥作用,提高了麦秸秆加筋土的抗剪强度,两者对强度增长的贡献率取决于筋土面积比(加筋间距)。
Salt expansion, dissolution and hygroscopic softening and other undesirable characteristics, easily lead to coastal saline soil low strength and large deformation problems. Wheat straw for reinforcement materials, can improve the shearing strength and anti-deformation properties of saline soil. In order to test the shear strength of wheat straw reinforced soil, the direct shear friction test of wheat straw and saline soil was completed. Wheat straw was laid horizontally, and the influence of four sample preparation conditions on the shear strength of the soil-soil interface was analyzed under the conditions of moisture content, dry density, spacing of stiffeners, and the presence or absence of stem segments of wheat straw. In view of the existence of two types of friction effects of tendons / soil and soil / soil on the whole shear interface, it is called the interfacial synthetic shear strength. The experimental results show that the comprehensive cohesion of the interface and the integrated internal friction angle of the interface both decrease with the increase of moisture content and spacing, and increase with the increase of dry density, Festival The study confirmed that there exist two types of friction effects of the soil / soil and soil / soil on the shear interface, and both of them work together to improve the shear strength of wheat straw reinforced soil. The contribution rate of the two to the growth of wheat straw depends on the reinforcement Soil area ratio (reinforced spacing).