Roadside support method for tight roof constant-resistance yielding roadway

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 failure, meeting safety and reliability requirements, and strong on-site applicability

Inactive Publication Date: 2015-05-13
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

Method used

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  • Roadside support method for tight roof constant-resistance yielding roadway
  • Roadside support method for tight roof constant-resistance yielding roadway

Examples

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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 roadside support method for a tight roof constant-resistance yielding roadway. A support device comprises a plurality of units of a split structure. Each unit comprises two parts of a constant-resistance yielding pad and a filler which are combined for use, wherein the constant-resistance yielding pad is an outer injection type single-body hydraulic supporting pillar which is provided with a short and thick plunger and of a deformation structure and is installed above the filler, and the sum of the highest lifting height of the constant-resistance yielding pad and the height of the filler is equal to the initial height of the roadway. Preset deformation control is carried out over a roof through the constant-resistance characteristic of the constant-resistance yielding pad; the roof is taken out in time when sinking to the compression limit of the constant-resistance yielding pad, and the filler is used for carrying out limiting deformation control over the roof. The roadside support method for the tight roof constant-resistance yielding roadway has the advantages of being good in adaptation deformation capacity, good in roadway forming performance, easy to operate, low in supporting cost, good in roadway safety and the like, and is particularly suitable for roadside support of the roadway with the tight roof in the gob-side entry retaining process.

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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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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