Shallow buried weak-cementation top plate working face overlying strata zoning dividing method and application
A weak cementation and working face technology, applied in ground mining, earthwork drilling, underground mining, etc., can solve problems such as poor integrity, inability to guide on-site, and many applications of water-conducting fracture zones, and achieve accurate judgment results
A weak cementation and working face technology, applied in ground mining, earthwork drilling, underground mining, etc., can solve problems such as poor integrity, inability to guide on-site, and many applications of water-conducting fracture zones, and achieve accurate judgment results
CN110145306AActive Publication Date: 2019-08-20SHANDONG UNIV OF SCI & TECH
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[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention.
[0046] Step 1: Test piece preparation
[0047] Obtain large pieces of weakly cemented sandy mudstone from the centralized roadway or working face of a typical shallow mine in the west, seal it with plastic wrap and transport it to the indoor laboratory; use a cutting machine to prepare the large piece of sandy mudstone into length × width × A cuboid rock sample with a height of 150mm×35mm×35mm, (see figure 1 ); Use a grinding machine to grind the six sections of the cuboid test piece smoothly, requiring the non-parallelism of the two ends to be ≤0.01mm, and the diameter deviation to be ≤0.02mm. In order to maintain the stability of the mechanical properties of the r...
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The invention discloses a shallow buried weak-cementation top plate working face overlying strata zoning dividing method and application. Firstly, the rock stratum fracture condition is objectively analyzed according to the relationship between the maximum tensile stress borne by all rock stratums and the ultimate stress and the relationship between the ultimate deflection and the separation layeramount; secondly, rock stratum layer positions where cracks are produced are objectively analyzed according to the maximum deflection generated when a rock stratum weak-cementation rock stratum at the upper portion of a fracture rock stratum produces cracks and the ultimate deflection and separation layer amount generated during fracturing, and how much zones the shallow buried weak-cementation top plate working face overlying strata is divided can be judged accordingly; the judgment process is based on real calculation data, no artificial factor is doped in the judgment method, development of a diversion fissure zone is highly accurately predicted, and a guiding effect on the field is truly achieved. By comparing the development height of a complete fracture zone of the working face overlying strata rock stratum or the highest range of an overlying strata crack damage zone with the position of a water-bearing stratum, whether a working face can achieve water retention exploitation ornot can be accurately evaluated, and a basis is provided for mine safety work.
Description
technical field [0001] The invention relates to a method for zoning the overlying rock in the mine stope, in particular to the method for zoning the overlying rock in the working face of the shallow buried weakly cemented roof, which can be used for the arrangement of gas drainage boreholes and the water-conducting zone of the overlying rock in the working face evaluation of. Background technique [0002] The mobile failure of overlying rock is usually divided into "three zones" in the vertical direction, namely the collapse zone, fault zone and bending zone. The height of the caving zone mainly depends on the mining height and the crushing property of the overlying rock, usually 3 to 5 times the mining height, while the fault zone depends on the amount of separated layers between the rock layers and the mechanical strength of the rock itself, and is generally 3 to 5 times the mining height. 10 to 15 times. Highly accurate division of the "three zones" of the roof has a gr...
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Patent Timeline
20 Aug 2019
Publication
CN110145306A
- IPC
- E21C41/18
- CPC
- E21C41/18
- Inventors
- 王俊; 杨尚