scholarly journals Study on the pressure relief effect in gob‐side coal body during mining an inclined longwall panel

2021 ◽  
Author(s):  
Ruoqian Zhou ◽  
Hongtu Wang ◽  
Cai Shu ◽  
Tao Chu
Keyword(s):  
Pressure Relief ◽  
Longwall Panel ◽  
Relief Effect

Analysis of Pressure Relief Effect on the Protective Layer of Hard Roof and Extra-Thickness Coal Seam Mining

2018 ◽  
Vol 37 (1) ◽  
pp. 163-172 ◽  
Author(s):  
Zhongchang Wang ◽  
Wenrui Bian
Keyword(s):  
Coal Seam ◽  
Protective Layer ◽  
Pressure Relief ◽  
Hard Roof ◽  
Seam Mining ◽  
Relief Effect

scholarly journals Stability Control of Deep Coal Roadway under the Pressure Relief Effect of Adjacent Roadway with Large Deformation: A Case Study

2021 ◽  
Vol 13 (8) ◽  
pp. 4412
Author(s):  
Houqiang Yang ◽  
Nong Zhang ◽  
Changliang Han ◽  
Changlun Sun ◽  
Guanghui Song ◽  
...  
Keyword(s):  
Large Deformation ◽  
Coal Mine ◽  
High Stress ◽  
Surrounding Rock ◽  
Western China ◽  
Engineering Practice ◽  
Pressure Relief ◽  
Coal Roadway ◽  
And Control ◽  
Relief Effect

High-efficiency maintenance and control of the deep coal roadway surrounding rock stability is a reliable guarantee for sustainable development of a coal mine. However, it is difficult to control the stability of a roadway that locates near a roadway with large deformation. With return air roadway 21201 (RAR 21201) in Hulusu coal mine as the research background, in situ investigation, theoretical analysis, numerical simulation, and engineering practice were carried out to study pressure relief effect on the surrounding rock after the severe deformation of the roadway. Besides, the feasibility of excavating a new roadway near this damaged one by means of pressure relief effect is also discussed. Results showed that after the strong mining roadway suffered huge loose deformation, the space inside shrank so violently that surrounding rock released high stress to a large extent, which formed certain pressure relief effect on the rock. Through excavating a new roadway near this deformed one, the new roadway could obtain a relative low stress environment with the help of the pressure relief effect, which is beneficial for maintenance and control of itself. Equal row spacing double-bearing ring support technology is proposed and carried out. Engineering practice indicates that the new excavated roadway escaped from possible separation fracture in the roof anchoring range, and the surrounding rock deformation of the new roadway is well controlled, which verifies the pressure relief effect mentioned. This paper provides a reference for scientific mining under the condition of deep buried and high stress mining in western China.

scholarly journals Vibration Behavior during Underground Drilling Based on an Innovative Measurement Method and the Application

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Peng Cheng ◽  
Wenlong Zhang ◽  
Wenzhou Li ◽  
Jie He ◽  
Youliang Feng
Keyword(s):  
Measurement Method ◽  
Pneumatic Drill ◽  
Drilling Process ◽  
Pressure Relief ◽  
Drilling Depth ◽  
Vibration Signals ◽  
Different Depths ◽  
The Impact ◽  
Dynamic Phenomena ◽  
Relief Effect

Pressure relief drilling is one of the most common techniques to reduce the impact of rock burst, but the useful dynamic phenomena in the drilling process are ignored due to the lack of corresponding technical methods. Based on the fact, an innovative measurement method for vibration signals during the drilling construction by pneumatic drill rig is presented in this study. The acquisition and analysis of vibration signals show that the vibration information can reflect the drilling depth, the amplitude of different depth can reflect the pressure, and the vibration events of different depths can reflect the pressure relief effect. The method proposed in the study is of great significance to the supervision of the relief work quantity, the disclosure of the pressure situation, and the evaluation of the pressure relief effect.

scholarly journals Study on Pressure Relief Effect of Rock Mass with Different Borehole Parameters

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Chao Peng ◽  
Wanrong Liu
Keyword(s):  
Acoustic Emission ◽  
Rock Mass ◽  
Rock Burst ◽  
Strength Reduction ◽  
Surrounding Rock ◽  
Reduction Degree ◽  
Occurrence Time ◽  
Pressure Relief ◽  
Research Results ◽  
Relief Effect

Rock burst is one of the disaster accidents that can easily happen in rock cavern engineering. At present, one of the most commonly used methods to control rock burst is borehole pressure relief technology. In this paper, the influence of drilling layout schemes on the pressure relief effect of surrounding rock mass is systematically studied. The research results show that the strength reduction degree, AE evolution characteristics, failure modes of rock samples with different borehole positions, boreholes spacing, boreholes dip angles, and boreholes layout forms are different. The strength reduction degree of rock sample with an inclined arrangement form is the largest, followed by the arrangement form being up three-flower layout or down three-flower layout. Using the inclined layout and three-flower layout can achieve better pressure relief effect of the surrounding rock mass. The research results are beneficial to the rock burst of surrounding rock of the cavern. The acoustic emission can effectively monitor the stability of the surrounding rock of the cavern. However, the threshold value and the occurrence time of the acoustic emission of the cavern instability changed after the cavern surrounding rock is drilled holes. If the borehole is arranged at the surrounding rock mass, the occurrence time of the cavern instability may be advanced.

scholarly journals Study on Pressure Relief Effect and Rock Failure Characteristics with Different Borehole Diameters

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Shiwei Liang ◽  
Long Zhang ◽  
Di Ge ◽  
Qiong Wang
Keyword(s):  
Acoustic Emission ◽  
Research Result ◽  
Borehole Diameter ◽  
Tunnel Construction ◽  
Emission Characteristics ◽  
Pressure Relief ◽  
Failure Characteristics ◽  
Damage And Failure ◽  
Acoustic Emission Count ◽  
Relief Effect

Rock burst is a common tunnel and mine dynamic disaster, especially for deep buried tunnels, which often leads to tunnel construction delay and even induces tunnel collapse and subsidence of strata. Rock drilling is one of the effective pressure relief methods to prevent these disasters. In order to study the influence of borehole diameter on rock mass pressure relief effect, indoor acoustic emission characteristics and numerical simulation of rock samples with different borehole diameter were studied. The research result shows that with the increase in borehole diameter, the effect of borehole pressure relief is better. Different borehole diameters do not change the overall trend of acoustic emission evolution, but it will lead to different acoustic emission count characteristics of rock damage and failure, especially the maximum acoustic emission count characteristics and corresponding strain values. The existence of drilling will lead to the failure stress of rock in advance. Moreover, the existence of drilling causes a great change in the failure mode of the specimen.

scholarly journals Analysis of pressure relief effect of borehole in rock burst mine

2021 ◽  
Author(s):  
Pengbo Xu ◽  
Junjie Shao ◽  
Dong Fan ◽  
Jianghua Chang ◽  
Ning Zhang
Keyword(s):  
Rock Burst ◽  
Pressure Relief ◽  
Relief Effect

Numerical assessment of the pressure relief effect of the hydraulic punching cavitation technique in a soft coal seam

2022 ◽  
Vol 8 (1) ◽  
Author(s):  
Wei Wang ◽  
Gang Wang ◽  
Wei Zhao ◽  
Liang Wang ◽  
Zhongkai Feng ◽  
...  
Keyword(s):  
Coal Seam ◽  
Pressure Relief ◽  
Soft Coal ◽  
Numerical Assessment ◽  
Soft Coal Seam ◽  
Relief Effect

Numerical Experiments of Drilling Pressure Relief Preventing Roadway Rock Burst

2013 ◽  
Vol 353-356 ◽  
pp. 1583-1587 ◽  
Author(s):  
Yan Liang Wen ◽  
Guo Jian Zhang ◽  
Zhi Qiang Zhang
Keyword(s):  
Rock Mass ◽  
Rock Burst ◽  
High Stress ◽  
Simulation Software ◽  
Control Technique ◽  
Pressure Relief ◽  
Main Factors ◽  
Rock Burst Mechanism ◽  
Research Situation ◽  
Relief Effect

Based on rock burst mechanism and the present research situation of control technique, pressure relief process of drilling to rock burst roadway is modeled by numerical simulation software, the contrast and analysis of stress field of surrounding rock are put up with and without pressure relief. The results of the calculation indicate that after drilling high stress area on the both sides of the roadway reduces obviously, but stress peak increases and its position is not converted into the deep areas evidently. It is the energy of the high stress area that makes the rock mass between the drillings failure, which achieves the purpose of pressure relief. Drilling diameter and space between drillings are main factors influencing pressure relief effect. The major the drilling diameter and the smaller the space between boreholes, the more complete the rock mass between the drillings failure and the better the pressure relief effect.

scholarly journals Technology of Coal Seam Long Borehole Blasting and Comprehensive Evaluation Method of Pressure Relief Effect in High Rockburst Proneness Longwall Panel

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Qianjia Hui ◽  
Zengzhu Shi ◽  
Dongxu Jia
Keyword(s):  
Coal Seam ◽  
Coal Mine ◽  
Vibration Monitoring ◽  
Vibration Velocity ◽  
Stress Monitoring ◽  
Pressure Relief ◽  
Blasting Operation ◽  
Working Face ◽  
Longwall Panel ◽  
Ground Stress

On August 2, 2019, a catastrophic rockburst disaster occurred in Tangshan mine, causing death of 7 miners. After the investigation, the coal mine is facing reproduction. Taking the 0291 panel as the engineering background, this paper studies the coal seam blasting pressure relief and ground stress monitoring technology in working face retreat. During the roadway development and working face excavation, coal seam blasting was adopted to transfer the high ground stress of coal seam to the deep ground of the coal body. The blasting operation is presented in detail in this paper. In the working face retreat stage, drilling powder method, hydraulic shield resistance monitoring, roof displacement, and vibration monitoring methods are implemented. The results show that the pressure relief range of coal seam is 4–12 m in the coal mass after blasting. The shield working resistance is stable at 20–30 MPa. The range of relative displacement of the roof is about −1.0 to 2.5 mm, and the maximum vertical vibration velocity is in the range of 7–11 cm/s, up to 12 cm/s. The measured parameters are acceptable, so it is concluded that 0291 panel can be safely mined. This study provides a reference for the coal seam blasting design for rockburst coal mine and provides a technical means for the analysis of pressure release effect and dynamic pressure monitoring during working face retreating.

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