Mined-out area deformation and stability assessment method based on gravity anomaly

Abstract

The invention discloses a mined-out area deformation and stability assessment method based on gravity anomaly, comprising the following steps: 1, arrangement of an absolute gravimeter observation point and erection of an absolute gravimeter; 2, acquisition of an absolute gravity observation value; 3, establishment of a space rectangular coordinate system; 4, center-of-mass coordinate calculation of a mined-out area rock surrounding sphere; and 5, drawing of a center-of-mass change curve of the mined-out area rock surrounding sphere and acquisition of stable deformation. The method is simple, reasonable in design, low in cost and convenient to operate; the deformation of the mined-out area can be accurately monitored by using gravity anomaly, so that the monitoring result is accurate; and the stability of the mined-out area is assessed according to the deformation of the mined area, and the stable deformation of the mined-out area is obtained, so the practicability is strong.

Description

technical field [0001] The invention belongs to the technical field of mine engineering, and in particular relates to a method for evaluating the deformation and stability of a mine goaf based on gravity anomalies. Background technique [0002] Mined-out areas in mines refer to the hollow areas between underground layers left after a series of artificial mining of underground minerals. The natural rock mass is originally in a state of natural stress balance, but due to the development and mining of mines, various spaces will inevitably be excavated inside the rock mass, such as roadways, stopes, etc., which will inevitably destroy the underground rock layer in the mining area. The stress balance produces secondary stress-strain effects. It is precisely because of this secondary stress-strain effect that the surrounding rock structure in the goaf of the mine is deformed, and even the stress balance structure is destroyed and moved until the structural stress balance of the r...

AI Technical Summary

Problems solved by technology

The main defect of the current method is that these studies are based on specific experiments, and the research methods and conclusions mainly rely on past experience, and the focus of these methods is generally on the geological problems caused by the deformation of the mine goaf. The evaluation of disasters ignores the observation of the overall deformation process and change law of the mine goaf from the mining stage to the post-mining vacant deformation stage.

[0010] Nowadays, there is no method that can evaluate the stability of the mine goaf, and it cannot comprehensively and effectively detect the deformation of the mine goaf, and at the same time evaluate the stability of the mine goaf, and it cannot reflect the mine Change law and characteristics of goaf

It can be seen from the above that the traditional deformation monitoring method, due to its inability to avoid its own defects, makes the deformation monitoring of the goaf in the mine deviate from the actual project, resulting in errors in the deformation and stability evaluation of the mining area, which cannot meet the requirements. Engineering Accuracy Requirements in Mining Areas

Images