Method for monitoring relative gravity of surface subsidence in coal mining process

Abstract

The invention discloses a method for monitoring relative gravity of surface subsidence in the coal mining process. The physical geodesy measuring theory and the law of universal gravitation are adopted as theoretical bases, a gravity observation datum point is selected in a mine lot, a feature point is selected in the surface subsidence area or main coal seam section of coal mining and adopted as a monitoring point, and relative gravity between the monitoring point and the gravity observation datum point is monitored by stage according to the progress of a coal mining work face through a relative gravimeter; then, the gravity change value of the monitoring point between two adjacent stages is calculated, and the surface subsidence value of the monitoring point is calculated. Compared with the prior art, the method has the advantages of being simple in monitoring essential data collecting instrument, high in measuring precision, accurate and reliable in monitoring result, efficient, easy and convenient to operate and the like. According to the method, values with geometrical significance can be provided, and certain physical mechanisms can be reflected, such as migration of underground materials and changing of surface elevation.

Description

technical field [0001] The invention relates to a method for monitoring surface subsidence during coal mining, in particular to a method for monitoring relative gravity of surface subsidence during coal mining. Background technique [0002] The surface subsidence that may be caused during coal mining will have a serious impact on the ecological environment of the mining area. Coal mining subsidence monitoring is a necessary task in the process of coal mining. The completion of this task can not only reveal the basic law of coal mine subsidence, but also can be used to judge the degree of impact of mining on buildings and structures, and timely repair the buildings. , reinforcement, relocation, or on-site reconstruction, and has great theoretical and practical significance for promoting mine safety and normal production, and improving economic and technological benefits. [0003] How to monitor the surface subsidence caused by coal mines in a timely and efficient manner requ...

AI Technical Summary

Problems solved by technology

Among them, GPS can efficiently monitor elevation changes, but requires long enough data records and a dedicated environmental impact correction model to obtain millimeter-level observation accuracy; InSAR provides two-dimensional surface deformation with limited spatial resolution, but the accuracy is usually It is reduced due to the spatial correction of SAR images, terrain effects and atmospheric effects; precision leveling is time-consuming and laborious to obtain high-precision leveling data, especially when the area is large; and 3D laser scanning technology has high measurement accuracy and Extremely high data collection rate, but it is necessary to consider the visibility of the field of view when collecting data. In addition, due to the discontinuity of ground laser 3D scanning sampling, the set deformation monitoring points may not become the sampling points of the laser scanner. point, so it is not suitable for coal mine subsidence monitoring

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