US 11,788,930 B2
Device and method for testing bearing capacity of single-row grouped pillars in horizontal goaf under biaxial loading
Guorui Feng, Taiyuan (CN); Jinwen Bai, Taiyuan (CN); Xudong Shi, Taiyuan (CN); Boqiang Cui, Taiyuan (CN); Xinyu Yang, Taiyuan (CN); Kai Wang, Taiyuan (CN); and Haotian Wu, Taiyuan (CN)
Assigned to Taiyuan University of Technology, Taiyuan (CN)
Filed by Taiyuan University of Technology, Shanxi (CN)
Filed on Jan. 26, 2022, as Appl. No. 17/584,474.
Claims priority of application No. 202110151077.9 (CN), filed on Feb. 4, 2021.
Prior Publication US 2022/0244139 A1, Aug. 4, 2022
Int. Cl. G01N 3/10 (2006.01); G01M 13/04 (2019.01); G01L 5/00 (2006.01)
CPC G01M 13/04 (2013.01) [G01L 5/0009 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A device for testing bearing capacity of single-row grouped pillars in a horizontal goaf under biaxial loading, comprising a testing machine base, stands, lower pressure disks, upper pressure disks, an upper pressing plate, a workbench, a transverse frame, vertical force loading devices, protection rings, vertical pushing shaft housings, screws, horizontal force loading devices, side frames, telescopic stand pillars for adjusting a height of the side frames, sliding wheels and sliding rails,
four protection rings are arranged on the testing machine base, and have the stands installed therein respectively, bottom ends of the stands are connected with the base, and top ends of the stands are connected with the transverse frame, the sliding rails are arranged on two sides of the base, and the side frames are slidably connected with the base through the telescopic stand pillars; the vertical force loading devices are arranged at a lower part of the transverse frame and the horizontal force loading devices are arranged at inner sides of the side frames, and each of the vertical force loading devices comprises a vertical hydraulic pushing shaft, a vertical hydraulic pump and a first pressure sensor; and each of the horizontal force loading devices comprises a transverse hydraulic pushing shaft, transverse pressing plates, a transverse hydraulic pump and a second pressure sensor; and
the lower pressure disks are installed on the workbench, samples are positioned between the lower pressure disks and the upper pressing plate, side faces of the samples are in contact with the transverse pressing plates, the horizontal force loading devices act on the samples through the transverse pressing plates, and the vertical force loading devices act on the samples through the upper pressure disks and the upper pressing plate.