Coal-rock drift quick tunnelling method

A coal-rock roadway, rapid technology, applied in the field of coal-rock roadway rapid excavation, can solve the problems of coal-rock mass penetration enhancement, outburst elimination, safety and rapid excavation difficulties, etc., to achieve the effect of suppressing spontaneous combustion, improving the working environment, and obvious effects

Active Publication Date: 2011-02-16
河南省煤层气开发利用有限公司
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a coal and rock mass that improves the air permeability of coal and rock mass, prevents coal and gas outburst, and realizes safe and rapid excavation in view of the current s

Method used

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  • Coal-rock drift quick tunnelling method
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  • Coal-rock drift quick tunnelling method

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Example Embodiment

[0014] Such as figure 1 , 2 As shown, the present invention operates according to the following steps:

[0015] The first step is to construct fracturing long boreholes in front of the tunneling. The final hole position of the borehole must pass the pressure relief zone to ensure that there is no geological, forward-looking borehole in the surrounding area, and the hole shall be sealed with a special fracturing plugging device;

[0016] The second step is to lay high-pressure pipelines, install, arrange and debug the fracturing pump unit;

[0017] The third step is to connect a special fracturing sealer through the high-pressure pipeline under the condition that the high-pressure pipeline is unblocked;

[0018] In the fourth step, heading for a head-on power outage, withdrawal of personnel, and setting up a safety cordon. Professional operators turn on the fracturing pump unit to implement hydraulic fracturing operations;

[0019] The fifth step is to drain underground, implement draina...

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Abstract

The invention relates to a coal-rock drift quick tunnelling method. In the method, hydraulic fracturing is carried out in underground coal rock mass, so as to improve permeability and safely and quickly tunnel. Firstly long drill holes are constructed at tunnelling head, hole termination is required to be over mining pressure releasing region, long drill holes such as geologic hole and boring hole are not existed near drill hole, a hole packer special for fracturing is adopted to seal hole, hole sealing position is required to be over mining pressure releasing region, meanwhile a high pressure pipeline is arranged, and a fracturing pump set is mounted, arranged and debugged; then the hole packer special for fracturing is connected by virtue of the high pressure pipeline; and finally tunnelling hydraulic fracturing operation is carried out, underground dewatering is carried out, a gas drainage hole is constructed, and online gas drainage is carried out, thus achieving the aims of permeability enhancing, protrusion dispelling and safe tunnelling. Compared with the conventional measures, the invention is safe and effective, coal seam permeability can be improved by more than one hundred times, gas drainage effect is obvious, protrusion preventing indexes after fracturing are all not more than critical values, and finally the aim of safe and quick tunnelling is achieved.

Description

technical field [0001] The invention relates to a method for performing hydraulic fracturing in underground coal and rock mass to increase permeability and eliminate outbursts of the coal and rock mass, thereby improving the gas permeability of the coal and rock mass and achieving safe and rapid excavation of coal and rock roadways. Background technique [0002] Increased permeability, outburst elimination, and safe and rapid excavation of underground coal and rock mass are recognized worldwide problems. Due to the difficulty of deep hole drilling in underground coal and rock formations, that is, the depth of coal seam drilling is limited, there are disasters such as gas overrun, gas accumulation, and even gas outburst during excavation. Even if a large amount of money is invested, a large number of drilling projects still cannot meet the requirements The safety requirements of excavation, and the drilling project makes the workers directly face the gas outburst coal body, w...

Claims

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Application Information

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IPC IPC(8): E21D9/00
Inventor 姜光杰王思鹏郭启文孙明闯李红晓史小卫白新华林萌陈平生付江伟袁宗柱耿义范永杰
Owner 河南省煤层气开发利用有限公司
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