Experimental device and method for the change law of mining water level in loose confined aquifer

Abstract

The invention discloses an experimental apparatus and method for change rule of mining water level of an unconsolidated confined aquifer. The apparatus comprises a data collector and a simulation box, wherein a simulative coal rock bed is arranged in the simulation box, an unconsolidated confined aquifer bag is arranged in the simulative coal rock bed at the upper part of the simulation box, the upper part of one side of the unconsolidated confined aquifer bag is provided with a water level pipe extended out the simulation box, and the other side of the unconsolidated confined aquifer bag is provided with a water inlet pipe extended out the simulation box and connected with a water tank; and the water level pipe is provided with a water level gauge connected with the data collector. Changes of the water level of the aquifer along with the mining of a working face is recorded by the water level gauge, so that an corresponding temporal-spatial relation between the changes of the water level and the movement of a key layer can be simulated, influence factors of the temporal-spatial relation can be simulated, and the temporal-spatial relation between the changes of the water level anda water-conducting crack zone under the confined aquifer also can be simulated. The apparatus is simple in structure, convenient to operate, diversified in use and adjustable in height of a water level supply source, and can implement different confined water heads and meet the simulation requirements under different mining conditions.

Description

technical field [0001] The invention relates to an experimental device and method, in particular to an experimental device and method for the change law of mining water level in a loose confined aquifer. Background technique [0002] Coal mining under loose confined aquifers, due to the high cost of dredging and drainage, long cycle, and great impact on the water environment, so most coal mines adopt pressure mining, but due to high pressure and thin bedrock, the resulting roof pressure The risk of water inrush also increases. Taking the Qidong coal mine in northern Anhui as an example, its 3 2 22, 3 2 21, 7 1 14, 7 1 12, 6 1 As many as 16 similar press frame water inrush accidents have occurred in multiple working faces such as 30, of which 6 1 From September 13, 2009 to March 1, 2010 in the 30 working face, four water inrush accidents occurred in just four months. Frequent press frame water inrush accidents have seriously affected the normal production of coal mines...

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Problems solved by technology

But what is the quantitative correspondence between the decline of the water level of the aquifer and the appearance of rock pressure in the working face? What are its influencing factors? Can the strength of mine pressure at the working face be forewarned by the drop of water level in the aquifer? How time-sensitive is the method? These are issues that have not yet been studied clearly. Therefore, it is very necessary to continue to study the early warning mechanism of coal mining pressure frame water inrush disasters under loose confined aquifers. However, at present, there is no experimental device for this aspect in the mining industry in my country. Based on this, this set of experimental devices is designed to study the time-space relationship between the water level drop of the aquifer and the movement of the key layer and its influencing factors

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