Load Transfer Mechanics In Fully-Grouted Roof Bolts

Serbousek, Maynard O.
Organization: International Conference on Ground Control in Mining
Pages: 9
Publication Date: Jan 1, 1984
Email to a Friend Abstract
The mechanics of load transfer of fully-grouted roof bolts in coal mines has been investigated in laboratory and analytical studies. The purpose of this research is to increase the understanding and better interpret data from pull tests which are routinely performed in the field. Laboratory work includes variation of bolt length, hole diameter and grout type in pull tests. Four-foot bolts were tested in holes of 1- and 1-3/8-inch diameters. Both polyester resins and inorganic grouts were used as the anchorage medium. The bolts were strain gauged at six locations to observe the rate of load transfer from the bolt to the rock mass when a force was applied at the bolt end using standard Jack pull testing procedures and equipment. Analytical studies using closed form solutions and finite-element techniques were compared to experimental results. The models are for the elastic regime only but do include slip elements. A detailed analysis of the load transfer mechanisms from the bolts through the grout to the rock mass is presented.
Full Article Download:
(1632 kb)


Additional chapters/articles from the SME-ICGCM book Proceeding of the Fourth Conference on Ground Control in Mining (ICGCM)

Truss Bolting On-Cycle in Jane Mine Lower Freeport Seam
Design Of A Roof Truss Bolting Plan For Bear Mine
Tension-Torque Relationship For Mechanical Anchored Roof Bol
A Novel System For Automatic Installation Of Cement Grouted
Load Transfer Mechanics In Fully-Grouted Roof Bolts
An Investigation Of Longwall Pillar Stress History
Impact Of Horizontal Load On Shield Supports
Interaction Between Roof And Support On Longwall Faces With
Roof Control With Polyurethane For Recovery Of Kitt Energy?s
First Caving And Its Effects--A Case Study
Staubbekampfung An Schildausbau In Bruchbaustreben (Combatin
Yield Pillar Applications--Impact On Strata Control And Coal
Constraint Is The Prime Variable In Pillar Strength
Massive Pillar Failure--Two Case Studies
Investigations Of Underground Coal Mine Bursts
Destressing Practice In Rockburst-Prone Ground
Statistical Characterization Of Coal-Mine Roof Failure: Sugg
Pillar Design - Continuous Miner Butt Section And Longwall D
Design Factors In Near-Seam Interaction
Remote Sensing For Roof Control And Mine Planning: An Overvi
Design, Construction And Performance Of A Single Pass Lining
Computer Modelling And In Situ Instrumentation Techniques: A
A Sonic Wave Attenuation Technique For Monitoring Of Stress
The Radio Imaging Method (RIM) -- A Means Of Detecting And I
Clay Veins: Their Physical Characteristics. Prediction, and
Evaluation of the Point Load Strength for Soft Rock Classifi
Ground Control Experiences in a High Horizontal Stress Field
Horizontal Stresses and Their Impact on Roof Stability at th
Ground Control Problem Associated with Longwall Mining of De
Geotechnical Aspects of Subsidence over Room and Pillar Mine
Proposed Criteria for Assessing Subsidence Damage to Surface
Surface Subsidence. in Longwall Mining--A Case Stud
An Integrated Approach to the Monitoring and Modeling of Gro