Bolting-grouting integrated support method for zonal disintegration of deep roadway surrounding rock

A technology of zonal rupture and bolt support, which is applied in the direction of earth drilling, installation of bolts, mining equipment, etc., can solve the problems of inapplicability, achieve the effects of improving stability, speeding up construction, and reducing maintenance costs

Active Publication Date: 2013-02-20
SHANDONG UNIV
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Problems solved by technology

However, this invention regards the surrounding rock as a single-layer loose circle, and does not use an

Method used

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  • Bolting-grouting integrated support method for zonal disintegration of deep roadway surrounding rock
  • Bolting-grouting integrated support method for zonal disintegration of deep roadway surrounding rock

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Embodiment Construction

[0025] Now in conjunction with the accompanying drawings and taking a certain mine as an example, the technical scheme of the present invention will be described in detail.

[0026] 1. First, according to figure 1 The bolt-sprayed net support is carried out to improve the stress state of the surrounding rock, to increase the normal restraint, and to strengthen the bolt to prevent cracking. The specific measures are as follows:

[0027] (1) After the excavation of the deep roadway 1 in a certain mine, the radial stress decreased rapidly due to unloading, and the hoop stress increased. The surrounding rock formed on the surface of the surrounding rock was in the initial excavation stress state 14, which was not conducive to the stability of the roadway 1. The anchor shotcrete support shall be carried out as soon as possible to improve the stress state of the surrounding rock. After the excavation, spray concrete 4 with a thickness of 20-30mm to seal the surrounding rock in time...

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Abstract

The invention specifically discloses a bolting-grouting integrated support method for zonal disintegration of deep roadway surrounding rock, and the method comprises the following steps of: (1) after the roadway is excavated, immediately shotting concrete to close the surrounding rock, employing a high-pretightening force overstrength anchor bolt for supporting in the first disintegration zone, and arranging a steel bar net on the inner wall of the roadway surrounding rock and shotting concrete again; (2) applying a pretightening force anchor cable on the top plate of the roadway surrounding rock such that the anchoring end of the anchor cable is located in the deep intact rock mass, arranging a steel I-beam closely to the surrounding rock, passing the anchor cable through the shotcrete, the steel I-beam and a yielding ring and fixing the anchor cable on the inner wall of the roadway surrounding rock by using an anchor cable lock, thereby realizing coupling and supporting of the anchor bolt and the anchor cable; and (3) according to the monitoring result of the zonal disintegration of the surrounding rock, performing the delayed anchor bolt support for about 20-30 days, and performing grouting reinforcement on each disintegration zone by virtue of long and short combined injection pipes or a hollow sectional spiral grouting anchor bolt. The bolting-grouting integrated support method is capable of effectively performing bolting-grouting integrated reinforcement on the disintegrated surrounding rock of the deep roadway and thereby obviously enhancing the stability of the roadway.

Description

technical field [0001] The invention relates to the technical field of support for deep high-in-situ stress mine caverns, in particular to an anchoring and grouting integrated support method for regional rupture of surrounding rocks in deep roadways. Background technique [0002] With the increasing demand for energy and the continuous increase of mining intensity, shallow resources are decreasing day by day, and mines at home and abroad have entered the state of deep resource mining one after another. my country's predicted total coal resources are about 5,059.2 billion tons, of which 53% are buried deeper than 1000m, and 73% are buried deeper than 600m. The mining depth of most mines in eastern my country has exceeded 800 meters, and many mines are extending to a depth of 900-1000 meters. Facing the coal resources of 1000-2000 meters in eastern my country account for 83% of the predicted reserves within 2000 meters, and the national deep coal reserves account for It is est...

Claims

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Application Information

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IPC IPC(8): E21D21/00E21D20/02
Inventor 王汉鹏李术才李建明张庆贺李海燕张庆松林春金
Owner SHANDONG UNIV
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