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Fracture coal-rock mass quasi-three dimensional prestressed reinforcement method

A prestressed, coal-rock mass technology, applied in the direction of earthwork drilling, shaft lining, tunnel lining, etc., can solve the problems of complex construction, high support cost, large overall deformation, etc., and achieve simple construction and low support cost Effect

Inactive Publication Date: 2018-06-22
SHANDONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the large in-situ stress in deep wells, the anchor rods and anchor cables supporting the roadway are prone to anchoring and breaking damage, and the U-shaped steel brackets and steel pipe concrete brackets are severely deformed, resulting in failure of the support system.
Passive support facilities such as U-shaped steel brackets and steel pipe concrete supports have complex construction and high support costs, and the bottom of the roadway is severely heaved, the overall deformation is still large, and roadway maintenance is difficult

Method used

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  • Fracture coal-rock mass quasi-three dimensional prestressed reinforcement method
  • Fracture coal-rock mass quasi-three dimensional prestressed reinforcement method
  • Fracture coal-rock mass quasi-three dimensional prestressed reinforcement method

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Embodiment Construction

[0030] The technical scheme of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0031] The specific implementation steps of a quasi-three-dimensional prestressed reinforcement method for fractured coal and rock mass are as follows:

[0032] A quasi-three-dimensional prestressed reinforcement method for fractured coal and rock masses, such as figure 1 , figure 2 Shown:

[0033] The first step, the initial support of anchor net cable

[0034] First, tunnel 1 according to the design shape of the tunnel section, and spray the concrete with a shotcrete machine while digging, which is called the initial spray layer 13, and the thickness of the spray layer is not less than 50mm to seal the weak and broken roadway surrounding rock surface; The two sides and roof of roadway 1 are installed with pressure-relief anchors 2 in a row spacing of 900mm×700mm, and pressure-relief anchor cables 3 are installed on the center line of the roof and t...

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Abstract

The invention discloses a fracture coal-rock mass quasi-three dimensional prestressed reinforcement method. The fracture coal-rock mass quasi-three dimensional prestressed reinforcement method comprises the steps that initial support of anchor net cables is conducted, tunneling and concrete spraying are conducted simultaneously, yielding anchor rods are mounted on the two sides and a roof of a roadway, and yielding anchor cables are mounted on the central line and the arch corner parts on the two sides of the roof correspondingly; secondly, slurry-injecting reinforcement is conducted, specifically, expansible slurry is injected into coal-rock mass on the two sides and the roof of the roadway; thirdly, concrete with the thickness being 100 mm is sprayed again; and fourthly, reverse arch reinforcement is conducted. The coal-rock mass subjected to slurry-injecting reinforcement is in a quasi-three dimensional stress state, and the bearing capability is improved obviously.

Description

Technical field [0001] The invention belongs to the field of coal mine tunnel support. Background technique [0002] With the continuous increase of deep mines in my country, the problems of large deformation of soft rock roadways in deep mines and broken surrounding rocks have caused difficulties in supporting control and seriously affected the production efficiency of coal mines. At present, in response to such problems, most coal mines generally adopt deep tunnel surrounding rock control technologies such as anchor net cable plus U-shaped steel support, anchor net cable + steel tube concrete support and U-shaped steel fully enclosed + shotcrete. This type of technology does not fully utilize the self-carrying capacity of the surrounding rock, and is mainly a passive support method based on steel supports. Due to the large in-situ stress in deep wells, the anchor rods and anchor cables supporting the roadway are prone to de-anchoring and breaking damage, and the U-shaped steel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D20/00E21D11/15E21D20/02C04B28/04
CPCE21D11/10C04B28/04E21D11/152E21D20/00E21D20/025E21D20/028C04B18/08C04B14/06C04B14/02C04B2103/302C04B2103/12
Inventor 刘立民闫旭吕国娜张进鹏张付涛
Owner SHANDONG UNIV OF SCI & TECH
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