Roadside proper yielding unequal combined filling structure of gob-side entry retaining and construction method

An unequal and appropriate technology, applied in the field of filling technology, can solve the problems of high cost, complicated construction, and uncertain pressure, and achieve the effect of alleviating the impact without warning, convenient and easy construction, and ensuring integrity.

Inactive Publication Date: 2014-08-06
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
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Problems solved by technology

[0007] In order to overcome the defects of complex construction, high cost, and uncertain yielding pressure of the existing gob-side entry filling structure under the condition of a hard roof, this invention provides a new filling technology using waste gangue and industrial waste slag. The combined filling structure of unequal strength has the function of giving way, and the filling body of the lower layer can provide higher supporting strength

Method used

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  • Roadside proper yielding unequal combined filling structure of gob-side entry retaining and construction method
  • Roadside proper yielding unequal combined filling structure of gob-side entry retaining and construction method

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Embodiment Construction

[0033] The structure and specific construction methods of the present invention will be described in detail below with reference to the accompanying drawings.

[0034] Step 1: After the excavation of the underground roadway, carry out anchor, cable, net, belt support and 6 supports of single hydraulic props on the working face, and arrange the working face at the same time. The goaf 12 is formed after the coal is coaled.

[0035] Step 2: Use a single hydraulic prop in the retaining entry 9 as the advance support 5 plus a hinged top beam support, and then use wooden pillars 11 for support and reinforcement within the filling width of the retaining entry side. With the advancement of the working face, the advance A single hydraulic prop is added to the support 5, and it is strengthened as a lag support 14; the lag support 14 and the wooden pillar 11 jointly bear the initial pressure of the roof before the upper filling body condenses.

[0036] Step 3: At the same time, the grou...

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Abstract

The invention discloses a roadside proper yielding unequal combined filling structure of gob-side entry retaining and a construction method. An upper-layer filling body of the filling structure is accumulated by gangue bags; a mixture of water, cements and crashed gangues is filled in the gangue bag; a lower-layer filling body is a filling plaster wall; the filling plaster wall is formed by a mixture of water, cements, waste plasters, blast furnace slags, waste limes, coal ashes and gangue powders. By adjusting the filling height and the preparation proportion of the two filling bodies, the structure provided by the invention can ensure the contractibilities of the filling bodies to be in a reasonable range, thus the filling bodies can better adapt to the movement rule of the hard roof strata and guarantee the stability of the gob-side entry retaining.

Description

technical field [0001] The invention relates to a filling technology applied in underground coal mines, in particular to a filling structure and construction method next to a gob-side entry under the condition of a hard roof. Background technique [0002] Backfilling along the gob-side roadway is a major reform of coal mining technology. This technology can not only improve the recovery rate of coal resources, extend the service life of the mine, reduce the amount of roadway excavation, alleviate the contradiction of mining replacement, and cancel the island working face. It is also the most effective way for mines to reform their coal mining methods. [0003] At present, the commonly used filling methods for gob-side entry retention at home and abroad mainly include cement-based paste filling, gangue belt filling, high-water quick-setting material filling and so on. Due to the gob-side entry retention under the condition of a hard roof, the working face basically has a lon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21F15/04E21F15/00
Inventor 宁建国于斌吴笛马鹏飞杨智文
Owner SHANDONG UNIV OF SCI & TECH
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