Method for determining thickness of safety top plate in down-traversing gob by tunnel

A goaf and tunnel technology, applied in tunnels, mining equipment, earth-moving drilling, etc., can solve the problem of small thickness of the safety roof, and achieve the effect of avoiding too small thickness and reducing construction risks.

Active Publication Date: 2014-04-09
CHINA SHENHUA ENERGY CO LTD +1
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Problems solved by technology

This determination process has many disadvantages in the actual implementation of the project, which often

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  • Method for determining thickness of safety top plate in down-traversing gob by tunnel
  • Method for determining thickness of safety top plate in down-traversing gob by tunnel
  • Method for determining thickness of safety top plate in down-traversing gob by tunnel

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Embodiment Construction

[0015] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

[0016] The main factors affecting the thickness of the safe roof of the tunnel under the goaf are the surrounding rock conditions, the state of the goaf (size, shape of the gob, management method of the gob roof), tunnel construction method, support method, blasting vibration, etc. These factors affect the stability of the thickness of the safety roof, which in turn has an important impact on the stability of the surrounding rock of the tunnel passing through. For the engineering design of the tunnel passing through the goaf, the reasonable thickness of the safety roof can be estimated by using the multi-factor theoretical analysis method.

[0017] Therefore, th...

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Abstract

The invention provides a method for determining the thickness of a safety top plate in down-traversing a gob by a tunnel. The method includes the following steps that the damaged depth D of a bottom plate of the gob is calculated; the thickness s of a virgin rock protection layer is calculated; the distance R between the center of the tunnel and a vault fracture area is calculated; the thickness H of the safety top plate is determined according to the following equation: H>= D+s+(R-r), wherein r is the radius of the channel. The problems that the tunnel and a base plate fracture area of the gob are mutually affected, the tunnel collapses and a roof collapses due to the excessively small thickness of the safety top plate are solved, and therefore the construction risks of the tunnel are reduced.

Description

technical field [0001] The invention relates to the field of a tunnel passing through a goaf, in particular to a method for determining the thickness of a safe roof of a tunnel passing through a gob. Background technique [0002] Coal is one of the main energy sources in today's society, but the mining of coal mines has had a certain impact on rock formations. After the coal mine is mined, the stress balance of the original surrounding rock is broken, and the stress of the surrounding rock is redistributed, while the floor of the goaf is affected by the goaf, resulting in plastic deformation and failure. When the tunnel is under construction through the gob, the tunnel construction disturbance will cause plastic deformation of the surrounding rock of the tunnel vault, and the goaf and the tunnel will interact with each other. When the thickness of the safety roof of the goaf under the tunnel is too small, the tunnel and the floor rupture area of ​​the gob will interact with...

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Application Information

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IPC IPC(8): E21D9/00
Inventor 何知思
Owner CHINA SHENHUA ENERGY CO LTD
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