A method of step-by-step retaining in gob-side entry with reinforced concrete wall

A technology for retaining concrete and empty roadways, which is applied in earthwork drilling, shaft lining, tunnel lining, etc. It can solve problems such as unformed norms, avoid damage or destruction, ensure safe roadway retention, and achieve good results

Inactive Publication Date: 2017-10-10
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, the deformation law of the surrounding rock and the parameter design of the roadside support have not yet formed a standard

Method used

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  • A method of step-by-step retaining in gob-side entry with reinforced concrete wall
  • A method of step-by-step retaining in gob-side entry with reinforced concrete wall
  • A method of step-by-step retaining in gob-side entry with reinforced concrete wall

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Embodiment 1

[0057] Take the transportation lane reserved in the upper section of a coal mine as the return airway in the lower section as an example. The height of the roadway is 3.0m, the roof collapse step of the working face is 15m, the coal seam is a stable rock formation, and the allowable sinking of the roof is 1.0m ; The ultimate compressive strength of the support is designed to be 25MPa, and the width is 1.8m; a certain number of metal yielding anchors are evenly installed on the roof and side walls of the roadway.

[0058] When carrying out gob-side entry retention for this roadway, the specific steps are as follows:

[0059] (1) The support resistance of the pressure body is calculated to be about 15MPa, then the rated pressures of the two upper sections of the inner wall are "A = 15MPa, B = 17MPa", and the height values ​​of the three sections are A = 0.6m, B = 0.6 m, C=1.3m, in which the compressible height of each part of the design is 0.5, 0.3m, to ensure the initial slow s...

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Abstract

The invention discloses a method for retaining roadways along the gob-side with reinforced concrete walls. The supporting body of the roadside is mainly composed of an inner wall, a gangue wall and an outer wall, wherein the inner wall and the outer wall are constructed of concrete materials with the same width The strength progressive filling body, the gangue wall is built with woven bags filled with gangue, and the distance between each section needs to be determined according to the actual geological situation of the working face. In the early stage of roof sinking, the present invention relies on the yielding clamp pad inside the gangue wall and the low-pressure yielding part on the upper part of the concrete wall to realize yielding control, allowing the roof to sink; and in the later stage of roof sinking, the compacted gangue wall and high-strength filling are used Body-to-top plate achieves limited deformation control. The invention has the characteristics of low cost of roadway retention, good roadway formation, high safety, good stability, etc., and has a wide range of applications, and can be applied to complex geological conditions such as hard roofs.

Description

technical field [0001] The invention relates to a gob-side entry retention method with a wide application range, in particular to a gob-side entry retention method with step-by-step reinforcement concrete walls. Background technique [0002] Gobside retaining, that is, coal pillarless mining technology, as an "old and new" subject, not only reduces the tunneling rate of 10,000 tons of roadway, but also eliminates the loss of coal resources in coal pillars between sections. It is called "old" because it has been proposed since the 1960s and has been successfully tested in individual coal mines; it is "new" because the general applicability of gob entry has not yet been determined. . In particular, the surrounding rock deformation law of gob-side retaining and the parameter design of roadside support have not yet formed a standard. In recent years, the development of concrete spraying technology has greatly reduced the labor intensity of roadside filling construction; on the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D11/04E21D11/10
CPCE21D11/04E21D11/10
Inventor 胡善超郭伟耀谭云亮宁建国尹延春于凤海牟文强
Owner SHANDONG UNIV OF SCI & TECH
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