An experimental device and test method for testing the stability of gob-side entry retention

Abstract

The invention relates to an experimental device and a testing method for testing the stability of a lane filling wall body and a lane base plate of gob-side entry retaining. The experimental device comprises an experimental rack which is used for filling a simulating material, wherein a top steel girder is arranged at the upper part of the experimental rack; a bottom steel channel is arranged at the lower part of the experimental rack; a fixed beam is arranged on the experimental rack below the top steel girder; one end of the fixed beam is hinged with a pressurized beam; and a pressurizing mechanism is arranged at the other end of the pressurized beam, and is used for exerting pressure on the pressurized beam according to the acting force of a broken rock beam in a fracture arch on the filling wall body. The sizes of the filling wall body near the lane and a model of the reserved lane are amplified under the condition that the size of the experimental device is limited; displacement and destroying processes of the filling wall body near the lane and a bottom plate rock can be precisely monitored; and the problems of an existing simulation system that deformation is not easily monitored due to over-large simulating proportional scale and over-small model of the filling wall body near the lane are avoided.

Description

technical field [0001] The invention relates to the field of similar material simulation experiment devices, in particular to an experiment device and a test method for testing the stability of gob-side entry retention. Background technique [0002] The geometric dimension of the coal mine stope space is generally hundreds of meters or nearly a kilometer, while the geometric dimension of the traditional experimental device is limited, and the geometric similarity ratio taken in the test is generally large, for example, when the geometric similarity ratio is 1:100, the width is 2.5m The filling wall is only 2.5cm in the experimental model, which is similar to the size of the ordinary stress sensor, so there is a size effect, and it is impossible to accurately measure the stress on the filling wall beside the roadway, and it is also not conducive to the filling wall beside the roadway. and monitor the displacement and deformation of the roadway floor. Therefore, prior art awa...

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Problems solved by technology

[0002] The geometric dimension of coal mine stope space is generally hundreds of meters or nearly a kilometer, while the geometric dimension of traditional experimental devices is limited, and the geometric similarity ratio taken in the test is generally large. For example, when the geometric similarity ratio is 1:100, the width is 2.5m The filling wall is only 2.5cm in the experimental model, which is similar to the size of ordinary stress sensors, so there is a size effect, which cannot accurately measure the stress on the filling wall next to the roadway, and is not conducive to the filling wall beside the roadway. and monitor the displacement and deformation of the roadway floor

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