Strip coal pillar stability testing device and testing method

Abstract

The invention provides a strip coal pillar stability testing device and testing method. The strip coal pillar stability testing device comprises a testing box body, a loading unit, a testing rack and a water supply unit, wherein the testing box body comprises a lower plate, a rear side plate, a front side plate, a left side plate, a right side plate and an upper plate; the loading unit comprises a hydraulic assembly, a left pressure head, a right pressure head, an upper pressure head, a pressurization tank and water bags; the testing rack comprises a left stand column, a right stand column and a cross beam, the left pressure head is connected with the left stand column, a plunger of the left pressure head is connected with the left side plate, the right pressure head is connected with the right stand column, a plunger of the right pressure head is connected with the right side plate, the upper pressure head is connected with the cross beam, and a plunger of the upper pressure head is connected with the upper plate; the water supply unit is connected with the water bags and a water adaptor. The strip coal pillar stability testing device and testing method have the beneficial effects as follows: the structure is firm, the assembly is simple, the operation is convenient, a strip mining process is simulated, and data obtained through a test are accurate; the strip mining process is simulated, data in the strip mining are acquired, and accordingly, the strip coal pillar stability is analyzed quantitatively.

Description

technical field [0001] The invention relates to the technical field of coal mining test equipment, in particular to a strip coal pillar stability test device and test method. Background technique [0002] With the development of urban construction and the improvement of coal mining intensity, the amount of "three-down" coal pressure under buildings, water bodies, and railways in my country has increased rapidly. Strip mining is an effective way to solve the "three-down" coal pressure one. Strip mining is to divide strips of a certain size along the direction or inclination of the coal seam within the mining range, one strip is mined and one is retained, and the mined strip and the reserved strip are arranged alternately, and the overlying rock is supported by the retained strip coal pillars to Reduce the subsidence of the overlying strata, control the movement of the strata, reduce mining damage, and achieve the purpose of protecting surface buildings (structures), terrain, ...

AI Technical Summary

Problems solved by technology

Theoretical analysis and numerical calculation ignore a large number of on-site uncertain factors, and the error is relatively large; after the field observation is completed, the strip coal pillar needs to enter the goaf again, which is difficult and dangerous; the indoor test is mainly carried out by MTS servo machine Uniaxial or triaxial coal-rock compression tests mainly study the strength of coal-rock mass, ignoring the size effect of coal-rock mass and the coupling effect of stope water in coal seam mining

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