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为深入了解坡积土中锚杆锚-土界面剪切变形特性随土体含水量和干密度的变化规律,本文采用自主研制的基于微元法锚-土界面摩阻性能测试方法和装置,引入均匀试验设计原理设计试验方案,测得不同含水量和干密度下锚-土界面的剪应力-剪切变形全过程曲线,其形状符合三折线模型。基于试验结果,回归得到了锚-土界面峰值抗剪强度随土体含水量和干密度变化的经验关系式。同时,试验结果表明:(1)锚-土界面峰值抗剪强度随土体含水量增加而降低,且土体干密度越大其降低幅度越大;(2)峰值抗剪强度随土体干密度的减小而降低,且土体含水量越小,其降低的幅度越大。
In order to further understand the variation law of shear deformation of anchor-soil interface in slope soil with the variation of soil water content and dry density, the self-developed test method and device for frictional resistance of anchor- The uniform experimental design principle is adopted to design the test scheme. The whole curve of shear stress-shear deformation of the anchorage-soil interface under different water contents and dry densities is obtained. The shape of the curve conforms to the tri-fold model. Based on the experimental results, the empirical relationship between peak shear strength at anchor-soil interface and soil water content and dry density was obtained by regression. At the same time, the experimental results show that: (1) The peak shear strength of anchor-soil interface decreases with the increase of soil water content, and the larger the soil dry density, the greater the decrease is. (2) The density decreases and decreases, and the smaller the soil moisture content, the greater the extent of its reduction.