Compression shear test device

Abstract

The invention discloses a compression-shear testing device, which comprises a clamping plate, a cylindrical cushion block, an angle-varied plate, a right angle base plate, a roller, a roller frame, a bolt and a nut. The device is characterized in that the angle-varied plate has an arc-shaped edge; the dimensions of the arc-shaped borderline of the angle-varied plate are matched with the dimensions of the arc-shaped borderline of the clamping plate; the edge part of the angle-varied plate, which is provided with annular holes, is inserted into a groove of the clamping plate; the cylindrical cushion block, the bolt and the nut fix the angle-varied plate on the clamping plate; the right angle base plate on the inner side of the angle-varied plate is in direct contact with a rock sample; the roller is arranged on the roller frame; the roller is in the shape of a cylindrical bar; and the diameter of the middle part of the bar is larger than that of the two ends thereof. The device can flexibly adjust the angle of a shearing surface of a sample. Furthermore, the device has the advantages of good autostability, good wholeness and high durability.

Description

technical field [0001] The present invention relates to the technical field of rock mechanics tests, more specifically to an indoor compression-shear test device for measuring the shear strength of rocks, using a pressure testing machine to apply a vertical load, and changing the shearing angle of the device to obtain different positive and negative effects of cube rock block failure. Stress and shear stress are combined to draw the strength envelope and obtain the corresponding rock strength parameters. Background technique [0002] The commonly used indoor test methods for determining the shear strength of rock are: direct shear test, variable angle shear test and triaxial compression test. The variable angle shear test is a kind of compression shear test, which is the simplest method, and has the advantages of simple equipment, easy operation, and low cost. The variable-angle shear test uses a pressure testing machine to apply a vertical load, and the rock sample is shea...

AI Technical Summary

Problems solved by technology

[0003] "Rock Mechanics" edited by Shen Mingrong (Tongji University Press, 1999) and "Rock Mechanics" edited by Wu Delun (Chongqing University Press, 2002) recommended similar The variable angle plate wedge shearing instrument, this type of shearing instrument adjusts the angle by replacing the backing plate with different angles, which has the disadvantages that the angle cannot be adjusted continuously and the integrity of the device is poor

"Rock Mechanics and Engineering" edited by Cai Meifeng (Science Press, 2002) also provides an angle die compression shear test device. The shortcomings of continuous angle adjustment and poor integrity of the device will cause the center of the sample and the fixture to change with the change of the angle, causing the center of gravity of the device to deviate from the center line, which will easily cause the device to fall

"Introduction to Engineering Geology" edited by Li Zhiyi and Yang Yuyun (China University of Geosciences Press, 1994) provides a variable-angle plate fixture, which initially solves the problems that the angle cannot be adjusted continuously and the center of gravity deviates. The main problem is to keep the corresponding angle of the plate unchanged during the experiment and increase the stability of the fixture

Zhu Dinghua et al. (Laboratory Research and Exploration, Vol. 20, No. 1, 2001) developed a variable-angle shearing instrument that changes the shear angle by changing different combinations of semicircular arcs. effect, but there is a shortcoming that the key parts of the instrument are easy to wear, which will shorten the service life of the device

Images