Asymmetric anchor bolt support test table and test method of gob-side entry driving roof at tunnel top

Abstract

The invention discloses an asymmetric anchor bolt support test table and test method of a gob-side entry driving roof at tunnel top; a test table wall is composed of an inner nesting structure and anouter nesting structure and capable of realizing horizontal and vertical stretching and suitable for requirements of various large and small tests; the matching is performed according to the strengthobtained through the conventional rock dynamic test and the similar analog test requirement to obtain the transparent rock material capable of satisfying the strength commuted strength through similarity ratio. Through the method disclosed by the invention, the support research on the gob-side entry driving asymmetric roof at the tunnel top can be realized, the entity model top edge is an arc, andthe test can accomplish the asymmetric anchor bolt support test, that is, the lengths of the left anchor bolt and the right anchor bolt are unequal; the growth condition of the internal fracture of the rock under the asymmetric anchor bolt support can be observed through the transparent rock, and a black box problem which cannot be observed in the rock is overcome. In consideration of the influence on the top load by a goaf gangue being at the upper part of the gob-side entry driving at the tunnel top, the research on the asymmetric anchor bolt support mechanism of the asymmetric surroundingrock of the gob-side entry driving at the tunnel top at the staggered position is realized.

Description

technical field [0001] The invention discloses a test bench and a test method for asymmetric bolt support of the roof of a gob-side excavation roadway roof, and belongs to the technical field of bolt support test equipment for coal mining roadways. Background technique [0002] The roadway is the necessary passage for underground coal mining, and a smooth and stable roadway is the guarantee for the safe and efficient mining of coal mines. According to incomplete statistics, the total length of newly excavated roadways in my country's state-owned coal mines is 12,000 km each year. Therefore, the theory and technology of roadway support has always been one of the core research contents of coal mine rock formation control. The state-owned large and medium-sized coal mines have a roadway bolt support rate of 60%, and in some mining areas it exceeds 90% or even 100%. [0003] The gob-side excavation at the top of the roadway is one of the common gob-side roadways at present. It...

AI Technical Summary

Problems solved by technology

There are large deviations between theoretical analysis and numerical simulation and reality. On-site research on bolts (cables) has its advantages, but mining is still a black box problem, and the internal structure of rock mass cannot be directly observed.

At present, the equipment for research on bolt (cable) support in the laboratory is limited, which limits the development of research on bolt (cable) support.

Secondly, the size of the current laboratory equipment is fixed, and it cannot meet the requirements for the bolt (cable) support test to reveal the surrounding rock mass with different volumes.

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