Two-way flexible loading system and method for simulating three-dimensional coal seam mining test bench

Abstract

The invention discloses a two-way flexible loading system for simulating a three-dimensional coal seam mining test bench, which includes a frame-type test bench carrying a model, a three-dimensional mining simulation system, a pneumatic loading system and a numerical control system, wherein the three-dimensional mining simulation system includes a grid type The airbag device is composed of several unit airbags, and each unit airbag has an independent cavity, so that the gas is delivered to it through the cooperation of the air pressure loading system, the numerical control system and the pressure stabilizing device. During the inflation process, each unit airbag is It is independent, and the inflated grid-type airbag device can simulate the three-dimensional loading of the coal seam. The bladder made of vulcanized rubber is used for pressurization. The pressure load is uniform, the internal pressure of the bladder is equal everywhere, and the force acting on the surface of the sample is uniform. . The invention makes up the blank of real three-dimensional coal seam with time effect, is beneficial to improve the authenticity of the test, and restores the real mining of coal mines.

Description

technical field [0001] The invention relates to a simulation system of a three-dimensional coal seam mining test bed, in particular to a bidirectional flexible loading system and method for simulating a three-dimensional coal seam mining test bed. Background technique [0002] The mining of the coal seam in the 3D physical simulation experiment is the key to the authenticity and reliability of the experiment. At present, coal seam mining in 3D physical simulation experiments generally adopts the method of extracting one-feed coal seam at one time and using steel plates or planks to simulate coal seam mining. This method is only a two-dimensional mining method and cannot meet the needs of three-dimensional mining. The previous two-dimensional coal seam mining method caused the overlying rock to collapse above the working face at one time, and there was not enough time for the upper rock to form a structure, so the test phenomenon was not obvious. [0003] At present, flexibl...

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Problems solved by technology

Meng Xiangyue (Development of a flexible boundary loading testing machine [J]. Journal of Rock Mechanics and Engineering, 2004, 23(10): 1760–1764.) developed a new type of rock and soil material loading testing machine by using hydraulic bladder loading, but there are In the process of injecting liquid, the air cannot be completely discharged, which leads to problems such as inaccurate test results; Jiang Yaodong et al. –3731.) developed a true three-axis roadway model test bench, which uses hydraulic pillows for flexible loading, but still has problems such as small strokes, easy oil leakage, and short life; CN2532474Y discloses a piston-type uniformly distributed pressure loader. Manufactured a piston-type flexible and evenly distributed pressure loader, which uses a multi-head connected hydraulic cylinder and a flexible cushion of loose granular semi-fluid material for loading, which solves the problem of flexible force transmission and uniform loading to a certain extent

The loading device of the above system often uses hydraulic oil to achieve flexible loading. The loading system is large and heavy, and it adopts a single-directional loading mode, which cannot realize two-way flexible loading, and is not suitable for simulating the real coal mining environment.

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