Work face withdrawal method in end-mining stage with waste rocks helpful for filling
A working face and stage technology, applied in the fields of backfill, mining equipment, earthwork drilling, etc., can solve the problems of difficult face retraction in the final mining stage, the pollution of the environment caused by the space occupied by the gangue, and the pollution of the environment caused by the space occupied by the stacking of the gangue. The effect of shortening the moving cycle, realizing multi-point operation, and improving the speed of retraction
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Embodiment 1
[0037] Example 1, prefabricated block filling assists the retreat of the working face at the final mining stage.
[0038] Firstly, the waste coal gangue is used to prepare the prefabricated block for filling, and it is maintained in advance, and its uniaxial compressive strength is tested to ensure that its strength is greater than the strength of the coal body mined in the working face, and then it is packaged and stored for use.
[0039] When the working face advances to the final mining stage, the prefabricated blocks are put down from the auxiliary shaft through the mine car to the yard at the bottom of the shaft, and then sent to the section return air level roadway through the main transport stone gate, and sent to the coal mining face by the belt conveyor, and finally Masonry of prefabricated blocks is carried out through the improved cover beam.
[0040] Prefabricated blocks shall be laid in ladder form before net support in the impact stage of final mining, and the mi...
Embodiment 2
[0043] Embodiment 2, prefabricated block filling combined with a single pre-excavation withdrawal channel assists the withdrawal of the working face at the final mining stage.
[0044] Firstly, waste coal gangue is used to prepare prefabricated blocks for filling, and maintenance is carried out in advance, and its uniaxial compressive strength is tested to ensure that its strength is greater than the strength of the coal body mined in the working face, and then packaged and stored for use.
[0045] Before the start of mining at the working face, the coal body of the mining line is stopped, and a retraction channel is excavated near the side of the working face, and the surrounding rock is supported by bolts and anchor cables, and the construction of the single retraction channel is completed. .
[0046] When the working face advances to the final mining stage, the prefabricated blocks are put down from the auxiliary shaft through the mine car to the yard at the bottom of the s...
Embodiment 3
[0050] Embodiment 3, prefabricated block filling combined with double pre-excavation withdrawal channels to assist the withdrawal of the working face at the final mining stage.
[0051] Firstly, waste coal gangue is used to prepare prefabricated blocks for filling, and maintenance is carried out in advance, and its uniaxial compressive strength is tested to ensure that its strength is greater than the strength of the coal body mined in the working face, and then packaged and stored for use.
[0052] Before the start of mining at the working face, the coal body of the mining line is stopped, and an auxiliary retraction channel is excavated near the side of the working face, and an interval of coal pillars is left between the side of the working face and the auxiliary retracting channel, and another channel is excavated As the main retracement channel, the main and auxiliary retracement channels are separated by a distance between the coal pillars to excavate the connecting roadw...
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