A Surrounding Rock Displacement Monitoring Method Based on Similar Simulation of Roadway Surrounding Rock

Abstract

The invention discloses a surrounding-rock displacement monitoring method in analog simulation of surrounding rocks of a roadway. The surrounding-rock displacement monitoring method comprises the following steps: (1) establishing a surrounding-rock displacement monitoring platform in analog simulation of the surrounding rocks of the roadway; (2) acquiring object-space three-dimensional coordinatesof control mark points; (3) acquiring a close-shot image sequence of cubic-simulation surrounding rocks at different periods; (4) preprocessing the close-shot image sequence of cubic-simulation surrounding rocks at different periods; (5) carrying out center positioning of monitoring mark points; (6) matching the same-name monitoring mark points at each period; (7) matching the same-name monitoring mark points at different periods; (8) acquiring object-space coordinates of the same-name monitoring mark points at each period; (9) carrying out statistics and analysis on the displacement change of the surrounding rocks. The surrounding-rock displacement monitoring method disclosed by the invention has the beneficial effects that the acquired close-shot image contains a large amount of structures and texture information of a shot target, the distribution of the monitoring mark points is simple, three-dimensional coordinate information of multiple sites on the surrounding rocks of the roadway can be acquired instantaneously, total coverage is achieved, the timeliness is strong, and the result from stress action of all the directions on the surrounding rocks of the roadway can be reflected comprehensively.

Description

technical field [0001] The invention belongs to the technical field of surrounding rock displacement monitoring, and in particular relates to a surrounding rock displacement monitoring method for similar simulation of roadway surrounding rock. Background technique [0002] As an important part of the coal mine, the roadway plays the role of transportation channel and access channel. The excavation of the roadway is the main cause of disturbance to the rock formation. In order to ensure the safe production of the coal mine and avoid subsidence, it is necessary to Surrounding rock displacement monitoring is very important. The similar simulation experiment of roadway surrounding rock is based on the similarity principle, the mine rock formation is reduced to a certain proportion, and the local ore body materials or similar materials are used to make models for research. [0003] At present, the traditional measurement method for the displacement of surrounding rock in the roa...

AI Technical Summary

Problems solved by technology

[0003] At present, the traditional measurement method for the displacement of surrounding rock in the roadway similar simulation experiment is mainly the static strain gauge method. This method has the disadvantages of troublesome installation process before the test and limited monitoring mark points.

In recent years, optical-based digital speckle has been widely used. The related measurement method is to measure the two-dimensional strain field of the crack through the interference of light waves, so as to reflect the displacement of the model. However, this method has low measurement accuracy and complex data calculation in the later stage. Shortcomings

At present, most of the mining displacement results of similar models start from a two-dimensional perspective, and output a two-dimensional trend map or contour map. This expression method cannot fully reflect the results of the roadway being subjected to stress from various directions, and has great limitations. sex

At the same time, since the monitoring of the displacement of the surrounding rock in the roadway is a dynamic measurement, people are most concerned about the process of instability and failure. However, if the sensor is also damaged along with the measurement object’s instability and failure, it will lead to the failure of dynamic measurement. Therefore, How to perfect the measurement model and improve the measurement scheme is an urgent problem to be solved in the displacement monitoring of the roadway surrounding rock

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