Device and method for testing bearing capacity of multiple rows of group columns under uniaxial loading in inclined goaf

Abstract

The invention discloses a device and a method for testing the bearing capacity of multiple rows of group columns under uniaxial loading in an inclined goaf. The bottom of a rack of the device is connected with a base of a testing machine, and the top of the rack is connected with a cross frame; an upper sliding clamping seat and a lower sliding clamping seat are semi-cylindrical blocks respectively, five positioning grooves located on the same center line are formed in the lower sliding clamping seat, the positioning grooves are separated by baffles, and tensile capacity testing can be carried out on 1-5 test pieces at the same time; the upper part of the upper sliding clamping seat is connected with an upper pressing disc, and a force control device acts on the upper pressing disc through a hydraulic pushing shaft; the lower sliding clamping seat is connected with a lower pressing disc; and scale lines are arranged on the outer edges of the upper sliding clamping seat and the lower sliding clamping seat, and the angle can be accurately regulated and controlled. According to the device and the method, synchronous loading of a plurality of coal, rock, filling bodies, concrete, coal-filling and rock-filling test pieces can be realized, the overall bearing capacity of a multi-row group column system in the inclined goaf under the uniaxial loading condition is obtained, and the mutual influence relation between group column individuals in the inclined goaf is obtained.

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.

Images