Abstract
In order to reveal the influence of friction between loading plate and test piece on test strength, Alloy steel, polytetrafluoroethylene and rubber are used as cushion, Uniaxial compression tests of marble cubes under different end contact conditions were carried out. The test results show that, When the cushion is thick, the greater the cushion stiffness is, the greater the test strength is; when the deformation modulus of cushion material is significantly smaller than the tested piece, the greater the cushion thickness is, the lower the test strength is,so the characteristics of cushion have significant influence on the test strength and failure characteristics. Based on the transverse deformation capacity of loading plate and specimen, the influence rule of different end conditions on test strength is given. The comparative test is carried out with a cylinder sample with a height diameter ratio of 2.0, Based on the viewpoint of relative strength, a new idea of reducing friction in rock test is put forward.
Highlights
In order to reveal the influence of friction between loading plate and test piece
polytetrafluoroethylene and rubber are used as cushion
when the deformation modulus of cushion material is significantly smaller than the tested piece
Summary
尤明庆等[1]通过大理岩的单轴压缩试验发现,端部加聚四 氟乙烯垫片可以显著降低试件的的单轴抗压强度。范鹏贤 等[2-4]对红砂岩开展的单轴压缩和双向压缩试验表明,加 载板和试件之间的摩擦可以显著的影响被测试件的强度 特性。杨圣奇等[5]通过大理岩的单轴压缩实验得出,岩石 强度的尺寸效应是端面摩擦效应作用造成岩石内部应力 分均匀分布的缘故。潘鹏志[6]等通过对单轴压缩破裂过程 进行模拟,表明试样端部的摩擦情况对岩石变形和强度特 性影响较大。麦戈等[7]通过对岩石单轴压缩强度的端部效
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