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运用最新研制的80t三维多功能土工试验机,对工程中常用的粗粒土与人造粗糙钢板构成的接触面在常刚度法向边界条件复杂加载路径下的三维力学特性进行了试验研究,分析总结了粗粒土与结构接触面在常刚度法向边界条件下的基本规律。试验结果表明:接触面受剪切时发生了明显的法向位移,从而直接导致了法向应力和抗剪强度的降低;法向位移可分为遵循不同规律的可逆和不可逆两部分;十字加载路径下的接触面摩擦角略大于圆形加载路径;单向往返和十字加载路径下接触面力学特性较为相似,但与圆形加载路径有明显不同。
Using the newly developed 80t three-dimensional multi-purpose geotextile testing machine, the three-dimensional mechanical properties of the contact surface between coarse-grained soil and artificial rough steel commonly used in engineering under the complex loading path of the normal stiffness boundary conditions were studied and analyzed. The basic law of the interface between coarse grained soil and structure under the normal stiffness boundary condition. The experimental results show that there is obvious normal displacement when the contact surface is sheared, which directly leads to the decrease of normal stress and shear strength. The normal displacement can be divided into two parts: reversible and irreversible according to different laws. The friction angle of the contact surface under the path is slightly larger than that of the circular loading path. The mechanical properties of the contact surface under the unidirectional reciprocating and cross-loading paths are similar but obviously different from the circular loading path.