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针对目前已有岩石直接拉伸试验装置的不足,研制轴向对中装置包括黏接对中装置和拉伸对中装置,两套对中装置可分别消除岩石试件黏接过程中的偏心和拉伸过程中的偏心,保证试件处于轴心受拉的状态。使用轴向对中装置和万能试验机,采用标准岩石试件进行直接拉伸试验,测试砂岩、灰岩和花岗岩的抗拉强度、极限拉应变和拉伸弹性模量,并给出拉应力–应变曲线。直接拉伸试验结果表明:岩石试件的拉断破坏面大都出现在试件中部;绝大部分岩石试件为脆性拉断破坏;岩石内部的裂隙对其抗拉性能影响很大,为了能精确测试岩石的抗拉强度指标,试验前应对试件进行严格的筛选。
Aiming at the shortcomings of the existing rock direct tensile testing device, the axial centering device includes the bonding centering device and the stretching centering device, and the two centering devices can respectively eliminate the eccentricity during the bonding of the rock specimen The eccentricity during the stretching process ensures that the test specimen is in a state of tensioned shaft. Tensile strength, ultimate tensile strain and tensile modulus of elasticity of sandstone, limestone and granite were tested by axial tensile test and universal testing machine using standard rock specimens. Tensile stress - Strain curve. The results of direct tensile tests show that most of the rock fracture specimens are in the middle part of the specimen; most of the rock specimens are brittle fracture; the cracks in the rock have a great influence on the tensile properties. In order to be accurate Tensile strength of rock test indicators, the test should be rigorously selected before the test.