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An energy-absorbing and impact-resistant roadway support method
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A roadway support and anti-shock technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., to achieve or weaken the impact disaster degree, save production costs, and prevent impact mine pressure
Active Publication Date: 2021-03-16
山东地科勘测设计有限公司
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Problems solved by technology
[0004] In the prior art, the problem of damage caused by strong shock waves cannot be solved by enhancing the strength of the roadway surrounding rock itself and improving the bearing capacity of the supports
Method used
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Embodiment 1
[0025] An energy-absorbing and impact-resistant roadway support method, comprising the following steps:
[0026] Step 1: First excavate the roadway, combined with the designed roadway section size: width × height = 5m × 3m, determine the dimension of the roadway excavation section: width × height = 6m×4.3m; Two gangs are used for support, the length of anchor 1 is 1.8m, the distance between anchor 1 is 1200mm, and the row spacing is 1200mm;
[0027] Step 2: Lay the metal formwork 4 on the 50m of the lagging excavation face, the cross section of the metal formwork 4 is a rectangle without a bottom or a straight wall arch, and the length of the metal formwork 4 is 5m;
[0028] Step 3: Add steel fibers with a volume percentage of 2% to the prefabricated foam concrete, and use a concrete filling pump for coal mines to fill the foam concrete 3 with paste between the metal formwork 4 and the tunnel wall from bottom to top;
[0029] Step 4: After the foam concrete 3 reaches the desi...
Embodiment 2
[0040] An energy-absorbing and impact-resistant roadway support method, comprising the following steps:
[0041] Step 1: First excavate the roadway, combined with the designed roadway section size: width×height=5m×3m, determine the roadway excavation section size: width×height=9m×5.8m. , and then use the bolt 1 to support the roof and the two sides of the roadway excavation section, the length of the bolt 1 is 2.4m, the distance between the bolt 1 is 800mm, and the row spacing is 800mm;
[0042] Step 2: laying the metal formwork 4 on the 30m of the lagging excavation face, the section of the metal formwork 4 is a rectangle without a bottom or a straight wall arch, and the length of the metal formwork 4 is 3m;
[0043] Step 3: Add steel fibers with a volume percentage of 4% to the prefabricated foam concrete, and use a concrete filling pump for coal mines to fill the foam concrete 3 with paste between the metal formwork 4 and the tunnel wall from bottom to top;
[0044] Step 4...
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Abstract
The invention discloses an energy-absorbing and impact-resistant roadway supporting method, and belongs to the technical field of mine safety. Starting from the energy absorbing property of porous medium materials, a certain proportion of 5D steel fibers with hooks at the end parts are added into foamed concrete to further improve concrete strength, and the foamed concrete with the 5D steel fibersis applied to a rock burst supporting structure to construct an energy-absorbing and impact-resistant supporting system consisting of a metal template, the foamed concrete and an anchor cable, a large amount of impact energy can be effectively absorbed, the dynamic load effect is buffered, the safety degree of a roadway is improved, and the rock burst disaster is reduced and avoided. The supporting system has an obvious attenuation and absorption effect on impact stress waves, eliminates or weakens the degree of impact disasters, and effectively prevents rock burst. Compared with the prior art, the impact load can be reduced by 60% or more, the stability of the roadway is improved, the process is simple, and the operability is strong.
Description
technical field [0001] The invention belongs to the technical field of mine safety, in particular to an energy-absorbing and impact-resistant roadway support method. Background technique [0002] Rock burst is a sudden dynamic disaster in the process of coal mining. Due to the sudden and violent release of high stress and high energy accumulated in the coal and rock mass, it usually causes the collapse, caving or even closure of the mining space instantly. The source disturbance type shock is a certain distance between the disturbance source (blasting or roof fracture) and the place where the rock burst occurs, and the vibration energy is transmitted through rock formation fracture, rotation, etc., or the fracture surface in the rock formation is slipped or the fault is activated to cause shock. [0003] Foam concrete is mainly composed of siliceous materials (quartz sand, slag, fly ash, shale, etc.), calcareous materials (lime, cement), adding an appropriate amount of air-e...
Claims
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Application Information
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