Test device and method for bearing capacity of multi-row column groups under uniaxial loading in inclined goaf

Abstract

The invention discloses a device and method for testing the bearing capacity of multi-row group columns under uniaxial loading in an inclined goaf. The bottom of the frame of the device is connected to the base of the testing machine, and the top is connected to the horizontal frame; the upper sliding deck and the lower sliding deck are semi-cylindrical blocks, and the lower sliding deck is provided with five positioning grooves on the same center line. The positioning grooves are separated by baffles, which can test the tensile strength of 1 to 5 specimens at the same time; the upper part of the upper sliding deck is connected with the upper pressure plate, and the force control device acts on the upper pressure plate through the hydraulic push shaft; The lower sliding deck is connected with the lower pressure plate; scale lines are arranged on the outer edges of the upper and lower sliding decks, which can precisely adjust the angle. The present invention can realize synchronous loading of multiple coal, rock, filling bodies, concrete, coal-filling, and rock-filling test pieces, obtain the overall bearing capacity of the multi-row column group system in the inclined goaf under the condition of uniaxial loading, and obtain the inclined Mutual influence relationship among individual pillars in goaf group.

Description

technical field [0001] The invention relates to a device and method for testing the bearing capacity of multi-row group columns under uniaxial loading in inclined goafs, which is mainly suitable for synchronous loading of multiple coal, rock, filling body, concrete, coal-fill, and rock-fill samples The device and method belong to the technical field of mining rock mechanics test. Background technique [0002] Due to the backwardness of the mining methods in the old mining period, a large number of coal pillars have been formed in many mines in my country, mainly including: knife column coal pillars, room pillar coal pillars, strip coal pillars, and short wall coal pillars Coal pillars, roadway-mined coal pillars, storehouse-style coal pillars, jump-mined coal pillars, etc., are densely distributed in space, have different shapes, interact with each other, are intricate and of different sizes, and form coal pillars in the form of communities. column group. Similarly, pillar g...

AI Technical Summary

Problems solved by technology

At present, it is difficult to monitor the overall bearing capacity of stope group columns on site, and can only rely on small-sized group column samples in the laboratory to test

Traditional testing machines can only load a single column sample, but cannot load a group of column samples

In actual engineering, the coal seam usually has a certain inclination angle and is not distributed horizontally. Therefore, it is very necessary to study the bearing capacity of the column group system at variable angles. However, the traditional testing machine cannot study the single-axis bearing capacity of the column group system at variable angles.

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