A dynamic control method for preventing non-uniform roof settlement of roadway cut without coal pillars

A coal pillar-free, non-uniform technology, applied in the direction of earth drilling, ground mining, mining equipment, etc., can solve problems such as subsidence, affecting ventilation, pedestrians, and compression of the cross-sectional area of ​​the roadway, so as to improve the stress state and secure the anchor point , Limit the effect of deformation and damage

Active Publication Date: 2020-12-15
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the traditional symmetrical anchor cable structure is used to support the roof, the roof will seriously sink to the side of the goaf, and the cross-sectional area of ​​the roadway will be severely compressed, which will affect ventilation and pedestrians.

Method used

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  • A dynamic control method for preventing non-uniform roof settlement of roadway cut without coal pillars
  • A dynamic control method for preventing non-uniform roof settlement of roadway cut without coal pillars
  • A dynamic control method for preventing non-uniform roof settlement of roadway cut without coal pillars

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] like Figure 1-5 As shown, step 1) arrange the first anchor cable system A1 and the second anchor cable system A2 along the roadway direction during the excavation, and the distance between the two systems is a;

[0057] like figure 1 , 2 As shown in and 3, step 1) arranging the first bolt system A1, the steps are as follows: step 1.1) according to the coal seam roof and floor 2 conditions, the roadway width l and the bolt cable parameter type, determine different bolt cable combination schemes based on theoretical calculation formulas , so that the bearing capacity of the roof after support shall not be less than 0.5MPa, the calculation formula is as follows:

[0058]

[0059] In the formula, σ is the bearing capacity of the roof after support, Q is the pre-tightening force of the anchor rod or anchor cable, l 0 is the effective length of the anchor rod or anchor cable; α is the control angle of the anchor rod or anchor cable, s 0 is the anchor rod or anchor cab...

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Abstract

The invention relates to a dynamic treatment method for preventing and controlling the non-uniform settlement of the roof of a roadway cut without coal pillars. During the roadway excavation, the first anchor cable system A1 and the second anchor cable system A2 are alternately arranged along the excavation direction; The cable parameters and their installation positions are designed in different areas to realize the initial reinforcement of the roof in different areas. The anchor cable system in the two areas can control the stability of the roof during the excavation through the transmission of internal forces, mutual influence, and mutual cooperation. In addition, the integrated arrangement of anchor rods and anchor cables in the same row is conducive to improving the stress state of shallow coal and rock mass, increasing the reinforcement strength of shallow coal and rock mass, and limiting deformation and damage of shallow surrounding rock. During the mining of the working face, the parameters of the inner anchor cable and the installation position of the roof are designed, and the focus is on controlling the uneven settlement of the roof. Through the periodical support measures during the excavation period and the recovery period, the effective force transmission and cooperation of the anchor cables installed in the two periods can jointly realize the effective control of the roof.

Description

technical field [0001] The invention relates to the field of coal mine roadway support, in particular to a dynamic treatment method for preventing non-uniform settlement of the roof of a roadway without coal pillars. Background technique [0002] Roof cutting into roadway is a new mining method without coal pillars. It cancels the filling rock pillars in the conventional gob-side entry retention, and does not need to use artificial filling materials. It only needs to unload the roof and lower the roof. Coal pillar-free mining can be realized by combining the crushing and swelling characteristics of the coal body. In fact, due to the particularity of the roadway cutting process without coal pillars, the asymmetry of the surrounding rock structure and stress distribution along the central axis of the roadway will result. 1. In the coal rock mass that has been damaged during the compaction process, one side is the solid coal that maintains good integrity. The mechanical proper...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D21/00E21C41/18
CPCE21C41/18E21D21/0026
Inventor 张广超梁赛江陶广哲文志杰陈连军蒋邦友徐美慧李杰俞瑨赵洪宝栾恒杰纳赛尔·葛尔萨纳米左宇军石少帅文金浩
Owner SHANDONG UNIV OF SCI & TECH
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