scholarly journals The Effectiveness of Bolt Support in Maintaining Mine Roadway

1982 ◽  
Vol 98 (1128) ◽  
pp. 73-77
Author(s):  
Makoto IHARA ◽  
Kikuo MATSUI ◽  
Yukiyoshi ICHIKAWA
Keyword(s):  
Mine Roadway ◽  
Bolt Support

scholarly journals Numerical Simulation Study on the Influence of Mine Earthquake on the Bolt Stress

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Xiaoqian Zhang ◽  
Heng Zhang ◽  
Chengmin Wei
Keyword(s):  
Safety Factor ◽  
Coal Mine ◽  
Axial Stress ◽  
Microseismic Monitoring ◽  
Earthquake Hypocenter ◽  
Mine Roadway ◽  
Bolt Stress ◽  
The Stability ◽  
The Impact ◽  
Bolt Support

Mine earthquake, as an underground disaster that occurs frequently, has a great impact on coal mine roadway and support. The stability analysis of the bolt support in roadway under different mine earthquake magnitudes is a key issue to be solved urgently in mining fields. This paper attempted to simulate the occurrence state of mine earthquake with explosive blasting process and verified it with actual coal mine microseismic monitoring data. ANSYS/LSDYNA software was used to analyze the impact of magnitude and location of mine earthquake hypocenter on the stability of bolt support and the dynamic stress characteristics of bolt. The results showed that with the increase in source energy of mine earthquake, the damage location of bolt mainly appears in the front of bolt and the loading position has no obvious change, but there is stress wave superposition effect, which deepens the damage of bolt. The bolts in the middle of the lane and the middle of the roof are greatly affected, so the support strength should be strengthened in these places. In addition, this paper compared the safety factor of bolt and the supporting effect of different schemes from three aspects such as roof subsidence, axial stress of bolt, and safety factor of bolt and then put forward a more economical and effective supporting scheme.

scholarly journals Influencing Factors of Disturbance Effects of Blasting and Driving of Deep Mine Roadway Groups

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Jiaguang Kan ◽  
Peng Wang ◽  
Peng Wang
Keyword(s):  
Conveyor Belt ◽  
Horizontal Distance ◽  
Deep Mine ◽  
Disturbance Effects ◽  
Rock Structure ◽  
Blasting Excavation ◽  
Mine Roadway ◽  
Deformation Speed ◽  
Group Layout ◽  
Bolt Support

The development and application of roadway group layout methods in coal mines have become more common and the mutual disturbance of blasting and driving of roadway groups has also become more prominent at depth. To improve the stability of rock mass surrounding roadways, we performed a systematic study on the factors that influence blasting and driving disturbances of adjacent roadways in deep mine roadway groups. We use the dynamic analysis module in FLAC3D to obtain the influence laws of three factors on the disturbance effects of adjacent roadways, namely, excavation methods, layer position changes of the roadway group, and whether or not bolt support is applied in the first roadway. Blasting strongly influences the surrounding roadway and increased horizontal distance can effectively reduce the disturbance effects of blasting and driving between adjacent roadways compared with increased vertical distance. Bolt support of the first excavated roadway enhances the roadway integrity and better stabilizes the rock structure surrounding the roadway. Industrial tests were carried out on three uphill roadways in the Gubei no. 1 mine (6-2). The monitoring results show that the movement of the roof and floor of the floor uphill return wind roadway is larger than that on the two sides. There is no notable change in the deformation speed of the surrounding rock in the floor return air roadway, but the deformation speed of the uphill conveyor belt roadway changes significantly. The results show that when the blasting excavation of a deep mine roadway group is more than five times the tunnel spacing, the increased horizontal distance effectively reduces the disturbance effects of excavation between adjacent roadways, which is consistent with the simulation results.

Experiment on Ultimate Shear Strength Parameters of Bolt Anchored Section

2011 ◽  
Vol 383-390 ◽  
pp. 218-223
Author(s):  
Shuan Chen Gu ◽  
Gen Fei Ye
Keyword(s):  
Shear Strength ◽  
Transmission Function ◽  
Strength Parameter ◽  
Ultimate Shear Strength ◽  
Support Design ◽  
Layer Interface ◽  
Shear Strength Parameter ◽  
Mine Roadway ◽  
Rigidity Coefficient ◽  
Bolt Support

The bolt support is one of the effective support means to stable the surrounding rocks in underground projects. To determine the ultimate shear strength parameter between the surrounding rocks and bolting mass interface would have important project value to the bolt support design. In order to easy and accurately determine the shear strength of the bolting layer in the bolt design, based on elastic-plastic theory, a theoretical model under the bolt pulling function was established. The load transmission function during the bolt function process was derived. The theoretical relationship between the limit shear strength parameter of the bolting layer interface and the bolt pulling test curve was obtain. The shear strength parameter between the resin anchoring agent of the bolt support in mine roadway and the coal rock mass was determined. The results show that with the bolt pulling test curves, the cohesive strength of the bolting layer and the shearing rigidity coefficient of the bolting layer interface could be easily obtained and could provide the references to the bolt support design.

Classification of Surrounding Rock of Bolt Supported in Coal Mine Roadway

2014 ◽  
Vol 986-987 ◽  
pp. 775-778 ◽  
Author(s):  
Feng Shan Han ◽  
Li Song
Keyword(s):  
Coal Mine ◽  
Classification System ◽  
Knowledge Engineering ◽  
Surrounding Rock ◽  
Rock Classification ◽  
Coal Roadway ◽  
Mine Roadway ◽  
Important Significance ◽  
Bolt Support

Classification of Surrounding rock of roadway of Coal mine bolt supporting is the basis of bolting design, To scientifically design coal roadway bolting, classification of surrounding rock of coal roadway bolting must first be carry out. in this paper, the comprehensive application of knowledge engineering, rock mechanics, we developed the surrounding rock classification system for the bolt support of coal mine roadway engineering, the surrounding rock classification system is practical easy to use, the bolt supporting of roadway surrounding rock classification results to the coal mine roadway bolt support has important significance and practical value.

Analysis on Coupling of Laminated Elastic Beam Element and the Shock Pressure of Surrounding Rock of Roadway

2012 ◽  
Vol 505 ◽  
pp. 429-433
Author(s):  
Jin Wei ◽  
Zi Ming Kou ◽  
Wang Wang
Keyword(s):  
Characteristic Curve ◽  
Impact Resistance ◽  
Elastic Beam ◽  
Present Situation ◽  
Beam Element ◽  
Tunnel Support ◽  
Beam Elements ◽  
Mine Roadway ◽  
Safety Production ◽  
High Support

Based on the rock pressure tunnel support present situation carries on the analysis, the laminated elastic beams of high support ability and impact resistance was designed.Therefore, through assumptions and establishment of mathematical model, and the application of viscoelastic beam dynamics equation, deformation and energy absorption of the laminated elastic beam elements,under the condition of rock burst, was deduced. According to the load - displacement characteristic curve, the coupling of laminated elastic beam elements and rockburst in coal mine roadway was analysed. This can provide a new method in the field of safety production of mining and roadway.

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