Rheological control method for ultra-soft coal seam roadway surrounding rock of sliding tectonic region
A soft coal seam and control method technology, applied in tunnels, earthwork drilling, tunnel lining, etc., can solve problems such as uneven deformation, rheological damage of soft coal, and achieve the effect of ensuring overall stability
Inactive Publication Date: 2018-04-13
CHINA UNIV OF MINING & TECH +1
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Problems solved by technology
[0003] In order to solve the above problems, the object of the present invention is to provide a method for controlling the rheology of the surrounding rock of the extremely soft coal seam roadway in the sliding structure area, so as to solve the problems of rheological damage and extremely uneven deformation of the soft coal between the bolt groups, and ensure the anchorage The overall stability of the load-bearing structure lays the foundation for the safe and efficient production of mines
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[0024] The present invention will be further described below in conjunction with the accompanying drawings.
[0025] This example takes a mining roadway in Chaohua Mine in Zhengzhou area as an example. The thickness of the coal seam is 8m, it is nearly horizontal, the hardness coefficient of the coal seam is 0.21, the coal seam is extremely loose, and has obvious rheological damage characteristics. The size is 4.8m×3.5m, and the original support is anchor mesh support, in which the surface protection components use welded steel mesh, and local roadways use diamond mesh.
[0026] On-site investigation and theoretical analysis of the failure phenomena of the roadway supported by anchor nets show that:
[0027] (1) When using welded steel mesh to protect the surface, after a certain deformation of the broken coal between the anchors, the solder joints are easy to crack and the binding wires connecting the mesh are easy to break, resulting in strong rheology and air leakage of the...
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The invention discloses a rheological control method for an ultra-soft coal seam roadway surrounding rock of a sliding tectonic region. The method includes the following two aspects that firstly, in anchor net supporting, anchor rod or anchor cable supporting parameters are determined through theoretical calculation and numerical analysis and include the material, the diameter, the length, the anchorage mode of anchor rods or anchor cables, the anchor rod or anchor cable pre-tightening force, the pallet type and the pallet size so as to strengthen the anchoring performance of the anchor rods or the anchor cables; and secondly, a surface protection member in anchor net supporting adopts a double-layer net, the inner layer net which makes contact with a coal seam adopts a steel plastic net and is used for preventing erosion of ultra-loosened and broken coal bodies, the outer layer net uses a steel bar embossing and weaving net and is used for improving the strength and rigidity of the surface protection member, and net holes of the steel plastic net are smaller than the net holes of the steel bar embossing and weaving net. By means of the rheological control method, rheological failure and extremely-uneven deformation of the soft coal bodies between anchor rod groups are controlled effectively, and the overall stability of an anchorage bearing structure is ensured.
Description
technical field [0001] The invention belongs to the technical field of coal mining, and in particular relates to a method for controlling the rheology of the surrounding rock of an extremely soft coal seam roadway in a sliding structure area. Background technique [0002] After the coal-forming strata in the Zhengzhou mining area were affected by multiple strong sliding structures, the original structure of the coal has been severely damaged. The hardness coefficient of the coal seam is generally below 0.1-0.3, and the thickness of the coal seam changes sharply between 0-37.8m, which is a typical Powder flake tectonic coal. Because the coal seam is low in strength, extremely loose, and prone to rheology, the strong rheology of the roadway surrounding rock supported by the bolt mesh in the structural coal seam produces extremely uneven and large deformation, and the anchor is "pulled" into the coal body, while the coal body around the anchor Drum" comes out. When the welded...
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IPC IPC(8): E21D11/15E21D20/00E21D21/00
CPCE21D11/152E21D20/00E21D21/0006E21D21/0026E21D21/0086
Inventor 谢文兵王兴开苏致立信长瑜张遵海
Owner CHINA UNIV OF MINING & TECH