Coal mine gob-side entry retaining roadside segment bearing unequal strength support principle and application

A technology of roadside support and empty roadway retention, which is used in surface mining, mining equipment, underground mining, etc.

Inactive Publication Date: 2010-12-22
成云海 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The side support of the transport roadway is divided into upper and lower layers of filling material combined support

Method used

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  • Coal mine gob-side entry retaining roadside segment bearing unequal strength support principle and application
  • Coal mine gob-side entry retaining roadside segment bearing unequal strength support principle and application
  • Coal mine gob-side entry retaining roadside segment bearing unequal strength support principle and application

Examples

Experimental program
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Embodiment Construction

[0018] 1. Set up prestressed anchor cables (12) on the old roof (1) and direct roof (2) of the roadway (3) to mobilize the bearing capacity of the deep stable rock formation. )0.5m, row spacing 2m. The vertical old roof (1) and direct roof (2) are set at an angle of 5° downward, and the bearing capacity and length of the prestressed anchor cable (12) are determined by the lithology of the roof.

[0019] 2. Two single hydraulic props (5) and hinged top beams (6) are respectively installed at 0.5m and 1.0m away from the upper side (4) for support, and the single hydraulic props (5) are in firm contact with the bottom plate (7). The single hydraulic prop (5) has sufficient initial supporting force, and the working resistance is not less than 250KN. The retention time of the pillar (5) is generally preferably 28 days. After the specific time needs to be observed, it is determined to flip forward after the top plate is stable.

[0020] 3. Repair the roof bolt (11) 1.7m away from...

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Abstract

The invention discloses a support principle which is suitable for coal mine gob-side entry retaining segment bearing roadside support and an application method. After a working surface begins to be exploited, a transport road adopts gob-side entry retaining which is completely preserved to be used as a return airway for the next working surface. According to characteristics of stratum movement, the segment bearing principle is put forward to carry out the roadside unequal strength support. The roadside unequal strength support is that bearing-deformation of a roadside support material carries out support of different strengths according to the segment movement intensity of the stratum in order to adapt to movement characteristics in different phases, namely different stratum movement phases, and correspondingly, the roadside support material has different mechanical properties and bearing-deformation parameters. Roadway support of the transport road is combined support by upper-layer padding and lower-layer padding. The whole padding combination body has not only large deformation amount but also high bearing strength, thus achieving double effects of support and sealing. The coal mine gob-side entry retaining roadside segment bearing unequal strength support principle and the application method are suitable for coal mine underground gob-side entry retaining roadside support.

Description

technical field [0001] This application relates to the principle and application method of segmental unequal strong support beside gob-side entry retaining in coal mines. Background technique [0002] Coal mine gobside entry retention (such as figure 1 (shown) means that the transportation lane of the coal mining face is completely preserved and left for the next coal mining face to be used as the return air lane. [0003] Gobside retaining belongs to the surrounding rock with large deformation, which is affected by the stress of tunneling and two mining operations (mining at this working face and mining at the next working face), and the mine pressure is severe, which is a complex systematic project. The main reasons for the failure of retaining entry and the difficulty of its widespread application are as follows: First, due to the lack of correct theoretical guidance, when designing support for retaining entry along the gob, it is believed that the higher the safety fact...

Claims

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Application Information

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IPC IPC(8): E21C41/16E21F1/00E21F15/00E21D15/02
Inventor 成云海姜福兴庞继禄郭信山张磊鑫
Owner 成云海
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