Experimental data in INCR 2023

The experimental data in INCR 2023 is now accessible and can be downloaded in attachments.

Task A: Rock Failure

Specimens

Group A consists of three circular through-holes with a diameter of 5mm, but the arrangement of the holes varies. The center-to-center distance from the central hole to the others is 10mm. In the first specimen, the holes form an angle of 135°; subsequently, the angles formed by the holes are 90°. The positions of all holes in the third one are obtained by clockwise rotation of 45° from the second one and the fourth one by rotation of 90°.

In Group B, three circular holes are horizontally arranged, but the radii of the center holes are different, namely 4.5mm, 6.5mm, 8.5mm, and 10.5mm. The diameters of the other holes are 5mm, and they maintain a 5mm spacing from the center hole.

In Group C, three holes are horizontally arranged with a spacing of 10mm between the centers of the holes. Each specimen has small holes with different cross-sectional shapes, including a horizontally placed square with a side length of 5mm, a square with a side length of 5mm rotated by 45°, a horseshoe shape with a width of 5mm, and an ellipse with a short axis of 5mm and a long axis of 10mm.

In Group D, there are three co-linear circular holes with a spacing of 10mm between their centers. The diameter of the circular holes is 5mm. In the four specimens, the angle between the line passing through the centers and the horizontal line is different for each, namely 90°, 67.5°, 45°, and 22.5°.

In Group E, each specimen has three horizontally arranged circular through-holes with a diameter of 5mm, and the spacing between the circular holes is 10mm. However, in each specimen, the through-holes are rotated around the x-axis (horizontal and parallel to the long side) at angles of 15°, 30°, 45°, and 60°, respectively.

In Group F, the variation lies in the number of circular holes in each specimen. The diameter of the circular holes is 5mm, and the horizontal spacing between the centers of the circular holes is 10mm. There are two layers (the first one) or three layers (others) of circular holes, with a spacing of 10mm between each layer and a center-to-center spacing of 10mm between holes in a layer. The circular holes in the first two specimens are arranged in a regular pattern, while those in the last two specimens are arranged in a crossing pattern.

Testing method

- A series of uniaxial compression tests are carried out on sandstone samples with some special inner holes.

- The dimensions of the intact sandstone samples are 50 mm ×50 mm × 20 mm.

- The loading speed of all compression tests is 0.1 mm/min.

- The deformation of the top edge and the loading force are recorded during tests.

UCS results

* Please indicate the data source when using it. "Zhe Li, Zhen-Qi Yang, Meng Fu, Gao-Feng Zhao. 2024. A geometric variation method to extract rock strength parameters via uniaxial compression testing. International Journal of Rock Mechanics and Mining Sciences. 178, 105755. doi:https://doi.org/10.1016/j.ijrmms.2024.105755"