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Method for controlling extreme broken roof in roadway head

A control method and extremely crushing technology, used in tunnels, earth-moving drilling, temporary shielding, etc., to achieve the effect of improving strength and ensuring safety

Inactive Publication Date: 2012-04-25
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to propose a timely and rapid effective control method for the control problem of the extremely broken roof in the high stress area of ​​the deep roadway at present

Method used

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  • Method for controlling extreme broken roof in roadway head
  • Method for controlling extreme broken roof in roadway head
  • Method for controlling extreme broken roof in roadway head

Examples

Experimental program
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Effect test

Embodiment Construction

[0018] Such as Figure 1-3 As shown, the specific steps of the roadway head-on pole broken roof control method of the present invention are:

[0019] Step 1: Arranging the bolt support boreholes at the head of the roadway excavation

[0020] During the excavation process of the roadway, when it is found that the roof cracks develop, the small area is broken, the support body is abnormal, and the damage range extends to the deep part of the roadway (such as figure 1 As shown), 3-4 rows of drill holes are arranged on the roof of the roadway excavation, the drill hole spacing is 0.8m, the drill hole row spacing is 0.8-1.0m, and the drill hole depth is 3.0-5.0m; the direction of the outermost row of drill holes is perpendicular to On the rock face, the remaining rows of drilling holes are drilled obliquely upward at an angle of 60-75 degrees;

[0021] Step 2: Install self-drilling ordinary anchor rods with temporary roof protection with steel bars

[0022] Install self-drilling...

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Abstract

The invention discloses a method for controlling breaking roof in roadway head. The method comprise the steps of: firstly, distributing anchor bolt support drill holes on a roadway tunneling head; then, arranging a common self-drilling anchor rod in the outermost row of vertical drill holes so as to match a steel bar belt for temporary roof protection; and finally, arranging a self-drilling grouting anchor rod in the rest rows of inclined drill holes and grouting towards the broken roof ahead. The method disclosed by the invention has the positive effects that by arranging the vertical self-drilling anchor rod by means of the tunneling head and matching with the steel bar belts with a maintenance function, an active maintenance role is played for the roof, the completeness of the head is effectively protected, and the safety of staff is ensured; and by means of inclined grouting, the undisturbed broken roof at the deep part of the head is reinforced, the roof strata strength is increased, broken and cracked rock masses deep in a roadway are reinforced into a complete rock strata, and safety guarantee is provided for the forward tunneling of the roadway.

Description

technical field [0001] The invention belongs to the technical field of mining. Background technique [0002] In the current mine mining, with the increase of mining depth (greater than 800 meters) and the enlargement of roadway section (greater than 15-20 square meters), in the process of advancing the excavation face, during the installation and advancement of mining face equipment and in the process of roadway maintenance In the high stress area caused by the geological structure, it is often encountered that the roof is greatly broken, causing local or large-scale roof fall accidents and potential safety hazards. At present, the prevention and control of such accidents mainly adopt measures such as artificial filling and temporary support. When there are abnormally high stress areas and complex structures at the head of the roadway, it is difficult to achieve effective control with the current method, resulting in waste of supporting materials and labor consumption. In ...

Claims

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Application Information

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IPC IPC(8): E21D9/10E21D21/00E21D20/02E21D19/00
Inventor 潘立友
Owner SHANDONG UNIV OF SCI & TECH
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