Extending the Limits of Strata Bolting by the Use of Flexible Strand Rockbolts

Barratt, Dennis R.
Organization: International Conference on Ground Control in Mining
Pages: 9
Publication Date: Jan 1, 1997
Rockbolting is now used extensively as a method of primary support in UK coalmines. Over the past fifteen years an optimum bolting system has evolved, based on a high grade steel bolt and a very strong stiff resin. Where necessary, cablebolts are used in conjunction with rockbolts as a supplementary means of support. The rockbolting system, as currently used, is based on a maximum bolt length of 2.4 m whilst cablebolts are generally 6 or 8 m long. Based on the UK experience, there are situations where it is necessary to extend the bolted horizon above that normally achieved with a 2.4 m long rockbolt. Until recently the only options available were coupled rockbolts or cablebolts, both of which have inherent problems in terms of installation. Flexible Strand Rockbolts (FSR), in lengths of 4 to 6 m, provide the means of being able to extend the normal bolted horizon Other advantages include increased strength characteristics (tensile and shear), able to be installed in the UK standard hole size (26-28 mm), encapsulation using resin capsules, thus offering immediate support, high bond strength compared to conventional strand, and able to be installed using existing drilling and bolting equipment. The FSR is considered to be a new concept in terms of strata control and one that compliments the rockbolting system currently in use.
Full Article Download:
(2585 kb)

Additional chapters/articles from the SME-ICGCM book 16th International Conference on Ground Control in Mining (ICGCM)

Longwall Mining-Through the Backfilled In-Panel Entries at C
Performance of Various Standing and Cribless Tailgate Suppor
Measurement of Effects of Interaction and Influence on Mine
Effects of Longwall Mining on Streamflow in the Pittsburgh S
Longwall Surface Subsidence Prediction Through Numerical Mod
Long-term Subsidence Over Longwall Chain Pillar Systems and
Subsidence Prediction Influence Assessment and Damage Contro
Formation of Face Headings Using Stress Relief at Asfordby M
Significant Weighting Events on the Longwalls in the Phalen
Full-face Pressure Monitoring in Medium-Weak Roof Condition
Research on the Interaction Between Roof Strata and Shield S
Roof Instability of Longwall Face at Ikeshima Colliery
Gob Canopy Roof Support for Difficult Natural Conditions
Yielding Cement Roof Supports for Longwall Mining
Management of the Dynamic Phenomena of Rock Pressure in Unde
Continuing Development of Innovative Cable Support Systems
Extending the Limits of Strata Bolting by the Use of Flexibl
Implementation and Evaluation of Roof Bolting in MICARE Mine
New Methods and Technologies of Roofbolting in Australia Coa
New Design Criteria for Roof Bolt Systems
Control Mechanism of a Tensioned Bolt System in the Laminate
A Study of the Performance of Glass Fibre Rock Reinforcement
A Method for the Selection of Rock Support Based on Bolt Loa
Strategies for the Application of Rockbolting Technology to
A Troubleshooting Guide for Roof Support Systems
A Statistical Overview of Retreat Mining of Coal Pillars in
Full-Scale Performance Evaluation of Mobile Roof Supports
Effect of the Interchamber Pi Yield on the Surface Strains i
Salt Pillar Design Equation
Case Study of Conditions Observed During the Removal of a Hi
Case Study of the Effect of Stratigraphic Location on Roof S
Ground Control and the Inundation of the Retsof Mine
Weatherability Test of Rocks for Underground Mines
Shear Strength Characteristics of Soft Rock Joints Based on
Comparison of Pillar Strengths Calculated Using Empirical Eq
Effects of In-seam and Near-seam Conditions and Asymmetric P
Ground Control Worker Safety During Extended Cut Mining
Analysis of Extensometer Data from a Room Widening Experimen
Airbag Support for Ground Control in Thin Seam Coal Mining
Development of a Statistical-Analytical Approach for Assessi
Ground Control Criteria for Coal Reserve Optimization in Mul
Calcium Aluminate Kiders in Hard Rock and Coal Mining
Simplified Pre-and Post-Processing Technique for Performing