A method of roadside side support with constant resistance of hard roof

A technology of hard roof and roadside support, which is used in earth-moving drilling, pillar/support, wellbore lining, etc., can solve the problem that the support has not been well solved, and the applicability of gob-side entry retention has not formed a perfect theoretical system, etc. problems, to achieve the effect of eliminating roadside support failures, meeting safety and reliability requirements, and easily controlling construction costs

Inactive Publication Date: 2017-06-09
SHANDONG UNIV OF SCI & TECH
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Problems solved by technology

But up to now, the applicability of the gob-side entry retaining has not yet formed a perfect theoretical system, especially the roadside support of the roadway has not been well resolved

Method used

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  • A method of roadside side support with constant resistance of hard roof
  • A method of roadside side support with constant resistance of hard roof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Take the roadway with a hard roof in a coal mine, and the structure of the constant resistance pressure pad as an externally injected single hydraulic prop with a short and thick live column as an example:

[0068] The height of the roadway is H=2.5m, the span is 3.8m, and the sinkage of the roof is 0.8m; A certain number of metal pressure anchor rods are evenly installed.

[0069] When supporting the gob-side retaining roadway of the hard roof, the supporting method includes the following steps:

[0070] (1) In the roadside support process of the roadway with a hard roof along the gob-side retaining, firstly, according to the expected deformation of the roadway, design the constant resistance yield height Hr=0.8m and the height of the roadside filling body Hc=H-Hr= 2.5m0.8m=1.7m.

[0071] (2) Then build a high-strength filling body (concrete column) on the floor on both sides of the roadway, with a compressive strength of 25MPa, a width of 1.5m, and a height of 1.7m....

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Abstract

The invention discloses a method for supporting the side of a roadway with a constant resistance yielding pressure of a hard roof. Among them, the constant resistance pressure pad is an external injection monolithic hydraulic prop with a deformed structure of a short and sturdy live column; the constant resistance pressure pad is installed on the filling body, and the sum of its maximum lifting height and the height of the filling body is equal to The initial height of the roadway. In the early stage of the invention, the constant resistance characteristic of the constant resistance pressure pad is used to control the given deformation of the top plate; when the top plate sinks to the compression limit of the constant resistance pressure pad, it is withdrawn in time, and the filling body is used to control the limited deformation of the top plate . The invention has the characteristics of strong adaptability to deformation, good roadway forming, simple operation, low support cost, good roadway safety, etc., and is especially suitable for roadside support of roadway with hard roof during gob-side entry retention.

Description

technical field [0001] The invention relates to a coal mine roadway support method, in particular to a hard roof constant resistance yield pressure roadside support method. Background technique [0002] Gobside entry is close to the goaf, and the transportation lane of the upper section is reserved and maintained as the return airway of the lower section, without coal pillars, so it is called gobside entry retention. [0003] Gob-side retaining, on the one hand, can reduce the amount of roadway excavation, thereby saving excavation costs and improving economic benefits; on the other hand, due to the mining without coal pillars, all coal can be recovered, thereby prolonging the life of the mine and improving social benefits. [0004] Gobside entry retention has been proposed in the early 1960s and has been successfully tested in individual coal mines. But up to now, the applicability of gob-side entry retaining has not yet formed a perfect theoretical system, especially the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/00E21D15/51
CPCE21D11/00E21D15/51
Inventor 郭忠平牟文强闫莎莎王修利张会晨
Owner SHANDONG UNIV OF SCI & TECH
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