Soft medium roofing method for roadside filling in gob-side retaining roadway
An empty entry retaining and medium technology, which is used in the fields of backfill, earthwork drilling, safety devices, etc., can solve the problems of backfill damage and loss of stability, and achieve the effect of reducing width, maintaining stability and avoiding damage.
Inactive Publication Date: 2011-12-28
CHINA UNIV OF MINING & TECH
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Problems solved by technology
In the existing roadside filling and gob-side retaining construction, the roof connection method in which the filling material is in direct contact with the roadway roof is generally used. This roof connection method is likely to cause stress concentration on the filling body due to the rotation and sinking of the old roof of the roadway, resulting in filling loss of stability
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[0011] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0012] Such as figure 1 as shown,
[0013] 1) According to the calculation formula (1) for the overall deformation of the roadway roof 1 to the roadway floor 2, the overall deformation of the roadway roof 1 to the roadway bottom 2 is calculated:
[0014] Δh=(h-h 1 )(l 1 +a+0.5a 1 ) / l (1)
[0015] Where: h 1 - Height h of contact with gangue after the old top turns 1 =k(h-m); h is the height from the roadway floor 2 to the old top of the working face; m is the mining height of the working face; a is the width of the roadway 3; a 1 is the width of the filling body 4; k is the compaction coefficient of the broken-bulk rock, which is generally taken as 1.25; l 1 - is the advanced fracture position of the key block; l is the length of the fracture block.
[0016] 2. When cementing materials are used for gob-side entry retention construction, a Δh he...
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The invention discloses a roof-connecting method for filling a gob-side retaining roadway next to a mining roadway without coal pillars, in particular to a soft-media roofing method for filling a gob-side retaining roadway next to a roadway. By using a soft medium to connect the roof between the filling body and the roof, the filling structure follows the sinking law of the gob-side entry roof, improving the longitudinal shrinkage and lateral stability of the filling structure, and reducing the unbalanced concentrated stress on the filling body , improve the stability of the filling structure. Beneficial effects: the roof connection method of the present invention is based on the characteristics of low strength and high shrinkage of the soft medium itself, through the deformation of the soft medium to meet the needs of the roadway roof sinking and lateral deformation, avoiding the damage to the filling body caused by concentrated stress, Maintain the stability of the filling body. On the premise that the strength of the filling body meets the requirements for supporting the roof of the roadway, the width of the filling body can be reduced and the cost of filling materials can be reduced.
Description
technical field [0001] The invention relates to a roof connection method for filling gob-side entry retention beside a mining entryway without coal pillars. Specifically, it is a soft medium roof connection method for roadside filling and gob-side retention. Background technique [0002] At present, roadside filling and gob-side entry retention is a construction method of gob-side entry retention in non-coal pillar mining commonly used at home and abroad. High-water materials, concrete and paste and other cementing materials are used for roadside filling and gob-side entry retention construction. In the existing roadside filling and gob-side retaining construction, the roofing method in which the filling material is in direct contact with the roof of the roadway is generally used. This method of roofing is likely to cause stress concentration on the filling body due to the rotation and sinking of the old roof of the roadway, resulting in filling Body damage and loss of stab...
Claims
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IPC IPC(8): E21F15/00
Inventor 周保精徐金海吴锐李冲马钱钱
Owner CHINA UNIV OF MINING & TECH