Improvement of Rock Direct Tensile Test Fixture and Its Experimental Method

In order to overcome the shortcomings of the existing experimental techniques, the direct tension test of rock is affected by gravity, which results in low accuracy and can’t be directly tested on the traditional rock press. The paper proposes a fixture for direct tension test of rock and a test method based on the fixture. This method transforms the tension direction from the traditional vertical direction to the horizontal direction, makes the gravity and the tension axial force orthogonal, and avoids the influence of gravity on the tension axial force. Moreover, the fixture can directly carry out the rock direct tension test on the ordinary rock press, and obtain the accurate results. Last, the loading rate can be reduced by changing the radian of the fixture to obtain the full stress-strain curve and rock tension strength.