Method for controlling surrounding rock of roof-cutting self-forming roadway

A control method and roof cutting technology, which is applied in mine roof support, earth square drilling, ground mining, etc., can solve the problems of complicated support work, unclear functions, high support cost, etc., and achieve economical and reasonable control parameters of surrounding rock, The effect of reducing the support cost and the safety and stability of the mining roadway

Inactive Publication Date: 2021-11-19
CHINA UNIV OF MINING & TECH (BEIJING) +3
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional roadway support parameters are mostly conservatively designed. Although the dilated rock mass exerts a certain force on the structural plane of the slit, the effect of the dilate

Method used

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  • Method for controlling surrounding rock of roof-cutting self-forming roadway
  • Method for controlling surrounding rock of roof-cutting self-forming roadway

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0030] Example 1

[0031] A typical embodiment of the present invention, such as Figure 1 - Figure 2 Shown, from top to give a cut Roadway control method.

[0032] Roadway shear forces of the top supporting area, a relatively balanced load forces, supporting forces basis, the acquired load forces, the establishment of support - charge balance.

[0033] Specifically, see figure 1 By mechanical analysis, that "rock support Swell - Roof of" mechanical model, and constructed to cut the top from mechanical equilibrium equation Roadway Support Parameter guide designed using this model.

[0034] Mechanical model, comprising: overburden load on the top plate 1, so that the use of underground pressure acting on the goaf collapse when a pair of overburden friction slit roof surface 2, the goaf rock strata collapse behind Swell top plate body 3 is cut slit surface 2 supporting force, the supporting force to help the coal roadway entity 4, anchored roof support force, hydraulic support force ...

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Abstract

The invention provides a method for controlling surrounding rock of a roof-cutting self-forming roadway, and relates to the field of coal mining roadway safety. The method comprises the following steps of: quantifying supporting force and load force of a roadway roof-cutting area through technical means such as theoretical analysis, numerical test, indoor test and field monitoring, and establishing a supporting-load balance relationship; determining supporting parameters of anchoring and hydraulic supports according to the supporting-load balance relationship by taking anchoring supporting force and hydraulic support supporting force as controllable supporting force; and arranging the anchoring and hydraulic supports according to the structure of the roof-cutting area to control deformation of the roadway roof-cutting area, establishing a balance relationship between the supporting and load of the roof-cutting area, quantifying the effect of collapsed, crushed and expanded rock on a cutting seam surface and substituting the effect into the balance relationship, accurately obtaining the supporting parameters of the controllable supporting force, guiding the engineering field supporting structure and supporting process design, ensuring long-term safety and stability of the roadway and reducing the supporting cost.

Description

technical field [0001] The invention relates to the safety field of coal mining roadway, in particular to a method for controlling the surrounding rock of a self-formed roadway with a top cut. Background technique [0002] The longwall coal mining method is currently a commonly used coal mining method. It needs to excavate two roadways and set up a section of coal pillars in one working face, which is easy to form a stress concentration area and difficult to control. Moreover, the coal pillars are difficult to control after mining in the working face. It cannot be recycled, resulting in a waste of coal resources; at present, this problem is solved by the self-forming roadway mining technology without coal pillars. The crack surface collapses to form a gravel roadway, which serves the next working face, changing the traditional longwall mining mode of double roadways on one side. [0003] Among them, the self-forming roadway technology without coal pillars by roof cutting an...

Claims

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Application Information

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IPC IPC(8): E21C41/18E21D20/00E21D23/00E21F17/18G01L5/00
CPCE21C41/18E21D20/00E21D23/00E21F17/18G01L5/00
Inventor 王琦肖宇驰江贝蒋振华杨军
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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