Progressive-strength concrete wall section dirt band limit receding gob-side entry retaining method

A technology for concrete and entry retention, which is applied in earthwork drilling, shaft equipment, wellbore lining, etc. It can solve problems such as unformed specifications, avoid damage or destruction, reduce costs, and achieve good results

Inactive Publication Date: 2016-04-27
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In particular, the deformation law of the surrounding rock and the pa

Method used

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  • Progressive-strength concrete wall section dirt band limit receding gob-side entry retaining method
  • Progressive-strength concrete wall section dirt band limit receding gob-side entry retaining method
  • Progressive-strength concrete wall section dirt band limit receding gob-side entry retaining method

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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 progressive-strength concrete wall section dirt band limit receding gob-side entry retaining method. A gob-side entry support is mainly composed of an internal wall, a gangue wall and an external wall. The internal wall and the external wall are filling bodies with progressive strength and are constructed in an equivalent width mode by using concrete materials. The gangue wall is piled up through woven bags containing gangue. The spacing distance among all sections needs to be determined according to the actual geological structure. According to the progressive-strength concrete wall section dirt band limit receding gob-side entry retaining method, in the earlier stage of roof settling, yielding control is achieved depending on yielding clamp pads inside the gangue wall and low yielding portions on the upper portion of the concrete wall, and roof settling is allowed to exist; in the later stage of roof moving and settling, limit deformation control of a roof is achieved through the compacted gangue wall and the high-strength filling bodies. The progressive-strength concrete wall section dirt band limit receding gob-side entry retaining method has the characteristics of being low in gob-side entry retaining cost, good in gob-side entry forming, high in security, good in stability and the like, is wide in application range and can be applied to the hard roof and other complicated geological conditions.

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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IPC IPC(8): E21D11/04E21D11/10
CPCE21D11/04E21D11/10
Inventor 胡善超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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