Three-dimensional pressure-relieving supporting method for prolonging service lives of deep soft rock supports
A soft rock and age-limited technology, applied in pillars/supports, temporary shields, earthwork drilling and mining, etc., can solve the problems of rapid roadway deformation and difficult maintenance, and achieve the effect of solving fast roadway deformation and difficult maintenance
Inactive Publication Date: 2012-03-28
LIAONING TECHNICAL UNIVERSITY
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Problems solved by technology
[0005] Aiming at the problems existing in the prior art, the present invention provides a three-dimensional pressure relief support method with a long service life of deep soft rock support, and achieves the purpose of bearing, pressure relief and stabilizing the soft rock roadway through a circular telescopic pressure relief ring , which solves the problems of rapid roadway deformation and difficult maintenance in soft rock roadway support at present, and constitutes the integration of pressure relief and support
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[0031] The U-shaped steel selected by the present invention is made of 36# steel, and the U-shaped steel is checked before construction to ensure that it has no cracks, no obstacles such as flashes, oxides, and molten slag in the arc section, and no hard transition phenomenon. When the equipment is fully prepared, the construction shall be carried out sequentially in the following manner.
[0032] Determine the center line and waist line in the soft rock roadway construction area of the mine, find out the position of the bottom nest according to the center line and the U-shaped steel 1 shed distance selected as the support, and then dig deep at the bottom nest position according to the center line and waist line until the excavation To the solid bottom, excavate a 180-220mm deep pit from the solid bottom, lay a piece of U-shaped steel 5 in the bottom pit as the bottom beam, and use two clamps 11 to fix and overlap a piece of transverse force U in the middle of the bottom beam...
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The invention belongs to the technical field of roadway supports in mining engineering, and particularly relates to a three-dimensional pressure-relieving supporting method for prolonging the service lives of deep soft rock supports. The basic steps for implementing the technical scheme of the invention are as follows: a bottom pit position is found in the soft rock roadway construction area of amine, a bottom pit which is 180mm to 220mm deep is dug, U steels as supports and transversely stressed U steels are laid in the bottom pit, a pressure-relieving reinforcing mesh is hung on the U steels as the supports, a grass curtain is laid on the outside of the pressure-relieving reinforcing mesh, cement-sand mixture filling is sprayed on the outside of the grass curtain, and the construction is carried out sequentially until the whole supports are closed, so that a round retractable pressure-relieving ring with the eight U steels as the supports is formed for supporting and protection. The technical scheme of the invention simultaneously has the effects of bearing, pressure relief and stabilization for the supports of a soft rock roadway, successfully solves the current problems of quick roadway deformation and difficult maintenance existing in soft rock roadway supporting, and integrates pressure relief and supporting together.
Description
technical field [0001] The invention belongs to the technical field of mine roadway support, and in particular relates to a three-dimensional pressure relief support method for prolonging the service life of deep soft rock support. Background technique [0002] As the global demand for energy continues to increase, coal mining is also gradually extending vertically and deeply. Due to the increasingly obvious effect of in-situ stress, the damage to soft rock roadways is increasing. The phenomenon of drums and two gangs creeping in is very serious. In some mines, when high-strength supports such as wood, I-beams, spray, anchors and anchor nets are used, severe cases will still undergo obvious deformation within a week, and local collapse or two gangs will be found within dozens of days. The situation seriously affects the production safety of the mine. [0003] Due to the continuous and rheological characteristics of soft rock deformation, when the original stress balance is...
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IPC IPC(8): E21D15/16E21D19/00E21D19/06
Inventor 贾廷贵曲国娜
Owner LIAONING TECHNICAL UNIVERSITY