Method for controlling wall rock of fully mechanized coal face goaf side coalbed laneway
A technology of goaf and fully mechanized caving face, applied in mining equipment, earthwork drilling, installation of bolts, etc., can solve the problem of fully mechanized caving face mining hindering fully mechanized caving equipment capacity, reducing the recovery rate of fully mechanized caving mining, and waste of coal resources and other problems, to achieve the effect of reducing the cost of roadway support, reducing the labor intensity of workers, and improving the efficiency of tunneling.
Inactive Publication Date: 2010-05-19
CHINA UNIV OF MINING & TECH
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Problems solved by technology
For a long time, large coal pillars (about 30m) have been adopted for the side coal seam roadways in the goaf of fully mechanized caving working faces. Waste, how to improve the recycling rate of this non-renewable resource has become a concern of the whole industry
The support of fully mechanized caving mining roadway, especially the gob-side excavation roadway, mostly adopts wooden sheds, metal brackets and other support methods, and there are also reports of bolt support, but the cost is high in application and the support effect is poor , the deformation of the roadway is serious, which affects the mining of the fully mechanized caving face and hinders the full use of the fully mechanized caving equipment.
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[0014] Embodiments of the present invention are further described below in conjunction with the accompanying drawings:
[0015] The method for controlling the surrounding rock of the coal seam roadway on the side of the goaf of the fully mechanized caving surface of the present invention is as follows:
[0016] 1. Stability analysis of the large structure of the overlying rock mass
[0017] 1. Taking a coal mine as an example, according to the measured geological data of the fully mechanized caving face and the mine pressure data of the adjacent mining face, it is known that the average burial depth of roadway 4 is 500m, the average coal thickness is 8.28m, and the coal seam dip angle is 3 ~7°, the joints and fissures are developed in the coal seam, which is a weak and broken coal seam. The cohesion of the coal seam is 2.2Mpa, the internal friction angle is 20°, and the density is 1.5g / cm 3 . The top of the coal seam is 0.2m thick gray mudstone, 2.06m thick gray-black silts...
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The invention is a method to control a wall rock in a side coal seam laneway in a goaf of a fully mechanized caving face. Based on the geology data of the fully mechanized caving face, which is measured at site, and the mine pressure data of a neighboring working face, exploitation of which is completed, stability of a large structure of a cover rock on the laneway is analyzed and width of a narrow coal pillar preset in at the side of the goaf is determined to make the laneway located in an area, where the coal vertical stress is relatively low, and a high-performance anchor support controlling the laneway wall rock makes the wall rock form a small loading structure in the anchor fixing area. The small structure makes full use of the self-loading capability of the wall rock, and is easilyadaptable to the wall rock deformation to ensure the laneway support is smooth and is not returned for repair. The anchor support is provided with the low cost, the high speed and the low labor intensity. Compared with the manner of laneway protection by large coal pillars, the manner of laneway protection by the small coal pillars reduces the loss of coal resources, promotes the recovery rate offully-mechanized mining, and is provided with the favorable economic and social benefits.
Description
technical field [0001] The invention relates to a method for controlling the stability of the surrounding rock of a coal seam roadway, which is suitable for controlling the surrounding rock stability of the coal seam roadway along the side of the goaf of a fully mechanized caving face. Background technique [0002] The fully mechanized top coal mining technology has become an important technical means of high yield and high efficiency in my country's coal mines and an important development direction of coal mining technology. The basic theoretical research on the control of surrounding rock in the fully mechanized caving stope has achieved great results, but the research on the stability control of the side roadway in the goaf of the fully mechanized caving face is less, which has become the main factor restricting the further development of the fully mechanized caving technology. For a long time, large coal pillar (about 30m) roadway protection is mainly used for the side c...
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IPC IPC(8): E21D20/00
Inventor 李学华侯朝炯丁效雷姚强岭杨宏敏
Owner CHINA UNIV OF MINING & TECH