Rock geometry-mechanics parameter acquisition method and holographic scanning system

Abstract

The invention discloses a rock geometric-mechanical parameter holographic scanning system and acquisition method. The system comprises an observation mechanism, a multi-scale penetration sounding mechanism, a grinding mechanism and a rock sample mounting mechanism which are arranged on a three-axis precision motion platform, and an industrial personal computer for controlling the operation mode ofeach mechanism of the platform. In addition, the parameter acquisition method comprises the following steps: sequentially carrying out surface image acquisition, indentation / or rotary-cut penetrationsounding test, pulse echo signal acquisition, surface three-dimensional morphology reconstruction, layer-by-layer polishing and repeated test on a rock sample; carrying out spatial interpolation on the obtained geometric and mechanical three-dimensional parameter dot matrixes formed by accumulating multiple layers of single-layer rock parameters to obtain geometric parameters and parameters of acorresponding mechanical field. According to the scanning system and method, the real space distribution and the corresponding mechanical parameter field of each medium in the rock sample can be obtained, and a more scientific method is provided for analyzing the mechanical property, damage and instability of the rock by combining with a high-performance numerical calculation method.

Description

technical field [0001] The invention relates to the technical field of rock parameter measurement equipment, in particular to a rock geometry-mechanical parameter acquisition method and a holographic scanning system. Background technique [0002] The acquisition of rock material parameters is the basic premise of various major foundation projects. How to quickly and accurately obtain rock mechanical parameters has always been the direction of researchers' efforts. Due to the diversity and complexity of the mesoscopic media inside rock materials, the material parameters in rock mechanics theory and numerical calculation analysis cannot be accurately quantified, so that the current analysis and calculation results often differ greatly from the actual observation values, and rock engineering practice is far from accurate. Far beyond the status quo of theoretical research on rock mechanics. With the continuous improvement of measurement and analysis technology, many scholars ha...

AI Technical Summary

Problems solved by technology

However, digital images are often limited to two-dimensional plane problems, and the values ​​of color and material parameters are still limited, and the influence of micro-crack heterogeneity of mineral particles cannot be considered

For the three-dimensional geometric distribution, X-ray CT scanning technology is the most commonly used, that is to use the strong penetrating ability of X-rays to scan rock samples layer by layer through micro-focus X-rays to quickly obtain the three-dimensional geometric parameters of rocks without Damage the internal structure of rocks; but the disadvantage is that the images obtained by CT scanning technology are essentially the distribution of X-ray wave velocity, and the internal structure of rocks is complex. When the density contrast between different media is weak, it cannot be clearly imaged by X-rays

This type of routine test has high efficiency, but the accuracy is relatively low. The main reason is that the boundary conditions of the test are complex, which is not as controllable as the standard test.

Images