Pressure-bearing underwater mining analog simulation testing device

Abstract

The invention discloses a pressure-bearing underwater mining analog simulation testing device. The device comprises a supporting frame, a coal bed and a rock stratum, wherein the coal bed and the rock stratum are erected on the supporting frame, and a confined aquifer is arranged in the rock stratum and comprises ten small water bags. For the first to fifth small water bags, each water inlet (7) is formed in the middle of the corresponding left side wall (5) and located at the position close to the corresponding front side wall (3), and each water outlet (8) is formed in the lower portion of the corresponding right side wall (6) and located at the position close to the corresponding rear side wall (4). For the sixth to tenth small water bags, each water inlet (7) is formed in the lower portion of the corresponding left side wall (5) and located at the position close to the corresponding front side wall (3). By the adoption of the pressure-bearing underwater mining aquifer analog simulation testing device and method, approximate simulation of confined water can be achieved during coal mining when an aquifer exists in overlying rock.

Description

technical field [0001] The invention relates to a test device, in particular to a similar simulation test device for pressure-bearing underwater coal mining. Background technique [0002] Confined aquifers widely exist in my country's coal-measure strata. Due to the existence of water pressure and recharge in such aquifers, coal mining under confined aquifers is threatened. There have been many accidents at home and abroad caused by the pressure frame of the coal mining face under the confined aquifer, resulting in a large number of casualties and huge economic losses. However, most accidents caused by pressure frames in working faces have a remarkable feature, that is, the bedrock in the upper part of the mining coal seam is relatively thin (thin bedrock), and there is a confined aquifer at the same time. In this way, under the combined effects of mining, mine pressure, and confined water, it becomes particularly important to understand the load transfer of confined water,...

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Problems solved by technology

[0003] (1) In the above method, an integral, full-length pressurized water bag is used to approximate the confined aquifer in the coal-measure strata. However, as a material of the water bag itself, it has certain strength and curvature. The full length of the water bag is used (for example, a 3m long test frame uses a 3m long water bag), because the water pressure of the pressurized water that needs to be simulated is generally high, the designed water bag must be able to withstand a certain water pressure, so that the water The strength of the bag itself should not be too low, and its curvature will naturally become smaller. In addition, the two ends of the water bag moving and deforming in the overlying rock will be compressed by the rock layer, and the moving and deforming area of ​​the overlying rock is large, which will cause water bags After the coal seam is mined, it cannot sink synchronously with the movement of the rock layer, resulting in the separation of the rock layer and the water bag, and the load of the confined aquifer cannot be transmitted downward, resulting in test distortion or even failure.

[0004] (2) In the above experimental methods, it is also impossible to simulate and monitor the flow and recharge of water in the part of the aquifer affected by mining during the mining process of the coal seam, and it is also impossible to estimate the advancing distance of the coal mining face. , propulsion speed and other factors and the change of the supply direction of the internal water flow in the confined water, and make qualitative and quantitative judgments, it is naturally impossible to draw a regular understanding

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