Stoping roadway gob-side entry retaining method suitable for liable-caving top plate
A technology for mining roadway and empty roadway retention, which is used in surface mining, earthwork drilling, underground mining, etc., can solve the problems of high cost, low supporting bearing capacity, long roof overhang, etc., and achieves high compressive strength and reduced The effect of roof load and material cost saving
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specific Embodiment approach 1
[0018] Specific implementation mode 1: This implementation mode records a method for retaining roadways along the goaf of mining roadways that are suitable for roofs that are prone to caving, and the method includes the following steps:
[0019] Step 1: Hanging a metal mesh 8 on the side of the coal wall of the gob near the mining roadway 5 to prevent the gangue 3 from pouring into the remaining roadway;
[0020] Step 2: Set up a high-resistance roof cutting support 6 on the side of the coal wall of the goaf near the mining roadway 5 to cut off the outer roof 2 of the roadway;
[0021] Step 3: Cut off the outer roof 2 of the roadway through the high-resistance roof cutting bracket 6, and fill part of the goaf with falling gangue 3, forming a layer of barrier between the roadway and the goaf to isolate the goaf;
[0022] Step 4: After the falling roof 2 is stabilized, a layer of foaming agent 7 is sprayed on the metal mesh 8 close to the surface of the side of the gob to furthe...
specific Embodiment approach 2
[0023] Specific embodiment two: a method of retaining roadway along the goaf of the mining roadway that is suitable for the easy-to-cause roof as described in specific embodiment one. In step two, the high-resistance roof cutting support 6 should meet the requirements
[0024] F≥ql+F b ;
[0025] Among them, F-cutting resistance; ql-load above the roof; F b - Shear forces between rock blocks forming a masonry beam structure at the fractured old roof.
specific Embodiment approach 3
[0026] Specific embodiment three: a method of retaining roadway along the goaf of a mining roadway that is suitable for a roof that is prone to caving described in specific embodiment one, in step 4, the foaming agent 7 adopts materials with sealing, flame retardant and anti-oxidation functions, For example, polyurethane foaming agent for coal mines.
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