Anchor cable grouting combined supporting method for inclined composite roof of coal roadway
A composite roof and roadway roof technology, which is applied in the installation of anchor rods, earthwork drilling, wellbore lining, etc., can solve the problems of uncoordinated stress points in space, weak shear resistance, and difficult operation, so as to improve pertinence and flexibility, improving the ability of the anchor cable to resist shearing and breaking, and improving the effect of force coordination
Pending Publication Date: 2021-07-23
INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI +1
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Problems solved by technology
The existing coal roadway support technology is mainly based on anchor net support. The anchor cables are in the form of steel strands, which are weak in shear damage resistance and have the same length. Incongruent; grouting is an effective method to strengthen surrounding rock, but grouting reinforcement generally needs to be sprayed first to form a grout-stop layer, which is mostly used in rock roadways. If it is applied in coal roadways, the workload is heavy and the operation is difficult, so it is rarely used application
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Embodiment 1
[0028] In the embodiment of the present invention, the inclined composite roof of the roadway is composed of the first roof soft rock 1a, the second roof hard rock 1a, the third roof soft rock 1c and the fourth roof hard rock 1d with an inclination angle of 10°-45°. The first roof soft rock 1a, the second roof hard rock 1a, the third roof soft rock 1c and the fourth roof hard rock 1d are sequentially distributed on the top of the roadway from bottom to top. The anchor cable 2 grouting combined support method for the inclined composite roof includes the following steps:
[0029] Step 1. After the roadway is excavated, drill bolt holes (inner diameter 30mm-35mm, depth 2.3-2.9m) on the roadway roof surface 7 in time. One volume of K2350 (rapid solidification type) and two volumes of Z2350 type (medium-speed solidification type) resin anchoring agent, and install the anchor rod 4 (diameter 22mm, length 2.2m ~ 2.8m), before installing the anchor rod 4 on the surface of the roadway ...
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The invention discloses an anchor cable grouting combined supporting method for an inclined composite roof of a coal roadway. The inclined composite roof comprises a first roof soft rock, a second roof hard rock, a third roof soft rock and a fourth roof hard rock. The method comprises the steps that firstly, roadway excavation construction is performed, after roadway excavation, a plurality of anchor rod holes are drilled in the surface of a roadway roof, and anchor rods are mounted in the anchor rod holes; after the anchor rod holes are drilled, a plurality of anchor cable holes are drilled at a certain distance in the tunneling direction of the roadway, each anchor cable hole is provided with an anchor cable, and the anchor cables are driven into the fourth roof hard rock; after the anchoring rods and the anchor cables are stabilized, a plurality of grouting holes are drilled in the surface of the roadway roof, grouting packers are mounted in the grouting holes for grouting one by one, and after grout is solidified, supporting is completed; and the steps are repeated to support the inclined composite roof of the whole coal roadway. The shear fracture resistance of the anchor cable and the shear strength of the composite roof are improved, a guniting link is removed, the pertinence and the flexibility of grouting are improved, and the applicability of grouting reinforcement in the coal roadway is improved.
Description
technical field [0001] The invention belongs to the field of surrounding rock support engineering of coal roadways in coal mines, and relates to an inclined composite roof support technology for coal roadways, in particular to an anchor cable grouting combined support method for inclined composite roof plates in coal roadways. Background technique [0002] In the process of tunneling in coal mines, inclined composite roofs are often encountered. After the excavation of the roadway, the inclined composite roof is prone to interlayer misalignment under the influence of unloading or the mining of the working face, resulting in anchor cable shear damage, resulting in large deformation damage and even roof caving and other disasters, and the support is difficult. The stability control of inclined composite roof has become a major problem in the safety and stability control of tunneling construction in coal mines. The existing coal roadway support technology is mainly based on an...
Claims
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Patent Timeline
Login to View More IPC IPC(8): E21D20/00E21D20/02E21D11/10
CPCE21D20/003E21D20/025E21D11/105
Inventor 康永水王小刚孙兴平陈建本王立冬侯俊友耿志徐东升刘靖毅刘滨
Owner INST OF ROCK AND SOIL MECHANICS - CHINESE ACAD OF SCI