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Dynamic treatment method for preventing coal pillar-free top cutting drivage roof non-equal settlement

A pillar-free, non-uniform technology, used in earth-moving drilling, ground mining, mining equipment, etc., can solve problems such as tunnel section area compression, affecting ventilation, pedestrians, subsidence, etc., to limit deformation and damage, and secure anchorage points. , the effect of improving the stress state

Active Publication Date: 2019-11-26
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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  • Dynamic treatment method for preventing coal pillar-free top cutting drivage roof non-equal settlement
  • Dynamic treatment method for preventing coal pillar-free top cutting drivage roof non-equal settlement
  • Dynamic treatment method for preventing coal pillar-free top cutting drivage roof non-equal settlement

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 coal pillar-free top cutting drivage roof non-equal settlement. In the drivage period, first anchor rod cable systems A1 and second anchor rod cable systems A2 are alternately arranged in the drivage direction; anchor rod cable parameters and anchor rod cable installation positions are designed in a partition manner, initial reinforcement of partitioned regions of a roof is achieved, and the anchor rod cable systems in the two regions affect each other and cooperate with each other through transmission effect of internal forceand jointly achieve stable control over the roof in the drivage period. In addition, anchor rods and anchor cables are integrally arranged side by side, shallow coal and rock mass stress state is advantageously improved, the reinforcement strength of a shallow coal and rock mass is improved, and shallow surrounding rock deformation damage is limited. In the recovery period of a working face, design of inward pulling anchor cable parameters and inward pulling anchor cable installation positions is carried out on the roof, and uneven settlement control over the roof is emphatically achieved. Through dayparting supporting measures in the drivage period and recovery period and effective force transmission and cooperation of the anchor rod cables installed in the two periods, effective controlover the roof is jointly achieved.

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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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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