Method for measuring shearing area of rock structral plane in direct shear test

Abstract

The invention provides a method for measuring shearing area of a rock structral plane in a direct shear test. The method comprises the following steps of: collecting an image; cutting and filling the image; converting the image into a grayscale image; selecting a gray threshold according to the obtained grayscale image of the rock structral plane; converting the grayscale image of the rock structral plane into a black and white binary image on the basis of the selected gray threshold; calculating percentage, namely percentage of the shearing area of the rock structral plane in the direct shear test, of the area of a white part in the area of the whole image; figuring out total actual area of the rock structral plane through using a graduated scale adopted during shooting as a reference object; and figuring out the shearing area of the rock structral plane in the direct shear test. According to the invention, defects of complicated operation, complicated steps, low working efficiency, large manual error and the like in the traditional measuring method can be solved; moreover, as the operation is simple, an important practical significance is obtained in reducing workloads of geologists, improving measuring accuracy and increasing working efficiency; meanwhile, as lower cost is achieved, the method for measuring the shearing area of the rock structral plane in the direct shear test, provided by the invention, is easy to be popularized.

Description

technical field [0001] The invention relates to the field of rock mass mechanics experiments, in particular to a method for measuring the shear area in the direct shear test of the rock mass structural surface. Background technique [0002] The purpose of the direct shear test of the rock mass discontinuity is to determine the shear parameters of the discontinuous surface of the rock mass, and to provide a basis for the stability analysis and prevention of the rock mass. It is a relatively conventional rock mechanics test. The shear strength of rock discontinuities is one of the most important mechanical parameters in rock slope stability analysis and prevention design, and scholars at home and abroad have been paying close attention to its value for many years. At present, there are mainly four methods for measuring shear strength parameters, namely: simulation test, parameter inversion, empirical estimation method and direct shear test. Among them, the direct shear test h...

AI Technical Summary

Problems solved by technology

[0005] (1) In the process of drawing the outline of the cut area, due to the visual angle and light, it is very easy to cause the error that the outline area is larger or smaller than the actual cut area;

[0006] (2) In the grid statistics process, due to the small size of each grid (1 mm ×1 mm ), long-term observation is prone to visual fatigue, and the phenomenon of missing numbers and majority;

[0007] (3) In the process of grid statistics, there is often a phenomenon that the outline part contains not the entire grid (such as half a grid). The usual method is to use the rounding method to become an integer, and the statistical deviation is introduced in the approximation process. ;

[0008] (4) Since the whole process of the conventional measurement method is a purely manual operation, the work efficiency is low, and it is not suitable for the measurement of large batches and processing of medium and large-scale rock mass test samples

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