Supporting Method of the Bolted Strata in Large Deformation Roadways

Yang, Shuangsuo
Organization: International Conference on Ground Control in Mining
Pages: 4
Publication Date: Jan 1, 2005
Based on field observations and physical modeling of simulated materials, the dynamic equilibrium principle on the whole interaction process between the surrounding rocks and support of large deformation roadways in coal mines has been developed. It explains the methods of forming the bolted strata and its changing load capacity with deformation. It also points out the factors and conditions for forming the bolted strata as follows: (1) many entries in coal mines are subject to large deformation. During their service life, it goes through the following process, elastic > plastic > fiacture > broken > loosening, etc. During this dynamic process, the mechanisms of supporting structure are changing and therefore the interaction between support and rocks experiences a process of dynamic equilibrium. Furthermore, the required supporting force for stabilizing the surrounding rocks shows overall decreasing trend; (2) the bolted strata is a special supporting structure consisting of bolt, rock skin protection devices and rock strata within the bolted horizon. As deformation increases, the supporting structure of the broken strata within the bolted horizon experiences a process of periodic change, from equilibrium > not equilibrium > equilibrium. Corresponding to this change, the supporting capacity of the bolted strata also fluctuates and gradually decreases; (3) under the bolted strata, the stability of a large deformation roadway is dynamic and step-wise; and (4) the formation of bolted strata, especially bolted broken strata depends on the existence of compressive force. Supporting the bolted strata is not constrained by the quality of the surrounding rocks. It has broad range of application.
Full Article Download:
(1663 kb)


Additional chapters/articles from the SME-ICGCM book 24th International Conference on Ground Control in Mining (ICGCM) 24th

Keynote Address at the 23rd International Conference on Grou
Analysis and Design of Rib Support (ADRS) a Rib Support Desi
Evaluation of the Impact of Standing Support on Ground Behav
Half a Career Trying to Understand Why the Roof Along the Lo
Forecasting Roof Falls with Monitoring Technologies - A Look
Analysis of Seismic Source Parameters of Roof Falls in Time
A System to Provide Early Warning on Impending Goaf
Outcomes of the Landmark Longwall Automation Project with Re
Application of Phenolic Foam in Longwall Mining
Multiple Seam Mining Interactions: Case Histories from the H
Analysis of Entry Stability Associated with Multi-seam Minin
Failure Mechanics of Multiple Seam Mining Interactions
Engineering Classification of Ultra-close Multiple Seam Roof
Definition of Ultra-close Multiple-seams and its Ground Pres
Depillaring and Roof Bolting Practices at Quinsam Coal Mine
Seam Structure - An Important Criterion for Coal Pillar Desi
Mitigating Longwall Subsidence Effects on a Large Industrial
Impacts of Longwall Mining on Hydrology, Soil Moisture, and
Basics on the Dimensioning and the Extraction of Shaft Safet
Modeling the Arc-effect of a Coal Mine Roof
Recent Advances in Numerical Simulation of Cutter Roof Failu
Test Method for Assessing Water Degradation Potential of Coa
Geotechnical Strata Characterisation Using Geophysical Boreh
A Method for Quantitative Void/Fracture Detection and Estima
Implication of Highly Anisotropic Horizontal Stresses on Ent
Ground Control of a Mine Stope in Weak Rocks Subjected to Hi
Analysis of Highwall Mining Stability - The Effect of Multip
Highwall Mining in a Multiple-seam, Western United States Se
The Slope Stability Assessment in the Wall Overlooking the S
Numerical Modeling as a Tool to Predict Pillar Condition and
Development and Testing of a New Roof Prop
Stability Mapping System
Using Foaming Grout to Stabilize a Ventilation Raise in Very
Roof Control and Roadway Support Design in the #9 Coal Seam,
Non-confirmation Mathematics for Wall Rock Classification fo
The Influence of the First Layer Thickness of Immediate Roof
Studies on Distribution Pattern of and Methane Migration Mec
Development of a New Roof Bolt Technology to Improve Gate- R
Improved Pull out Strength of Fully Grouted Roof Bolts throu
Experimental and Numerical Methodology Assessment of Load Tr
An Investigation into the Support Systems in South African C
Investigation of Fully Grouted Roof Bolts Installed Under In
Development of the Laboratory Short Encapsulation Pull Test
A Resin Quality Testing Procedure for Collieries
Determination of Load Transfer Characteristics of Gloved Res
Fully Grouted Torque Tension Bolts Successfully Support Pitt
Shear Bond Characteristics in Grouted Cable Bolts
Overcoring Techniques to Assess in Situ Corrosion of Galvani
Development of a Laboratory Facility for Testing Shear Perfo
Mechanical Response of Split-Set Rock Bolts in Squeezing Gro
Mechanisms of Rib Sloughing and Methods of Controlling Thick
Supporting Method of the Bolted Strata in Large Deformation
Assessment of Ground Conditions Near a Mine Portal Using Gro
Detection of Abandoned Mines and Air Passages/Burning Center
Detecting Abandoned Coal Mine Entries by High Resolution Ear