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运用最新研制的80 t三维多功能土工试验机对粗粒土与结构接触面在3种典型法向边界条件下的三维力学特性进行了试验研究。结果表明,接触面法向边界条件对其力学特性有重要影响,不同法向边界条件下接触面表现出了一些相似和不同的力学响应:(1)接触面总体上剪缩或有剪缩趋势,但数值不同;(2)除常应力条件外,接触面切向应力-切向位移关系曲线同一循环内一般不闭合,不同循环也不重合;(3)3种法向边界条件下接触面应力比-切向位移关系曲线同一循环内基本闭合,不同循环也基本重合,且形状较为相似,均呈椭圆形;(4)接触面静、动抗剪强度指标随法向边界条件变化不大,但动抗剪强度则差别很大。
Three-dimensional multi-purpose geotextile testing machine was used to test the three-dimensional mechanical properties of coarse-grained soil and structural interface under three typical normal boundary conditions. The results show that the normal boundary conditions of the contact surfaces have an important influence on the mechanical properties. The contact surfaces show similar and different mechanical responses under different normal boundary conditions: (1) The contact surfaces generally have the trend of shrinkage or shrinkage , But the values are different; (2) In addition to the normal stress conditions, the tangential stress-tangential displacement of the contact surface is generally not closed in the same cycle, nor different cycles; (3) The contact surface (4) The static and dynamic shear strength of the contact surface changed little with the normal boundary conditions, and the shear strength of the contact surface changed little with the normal boundary conditions , But the dynamic shear strength is very different.