Analysis of alternatives for using cable bolts as primary support at two low-seam coal mines

Abstract

Cable bolts are sometimes used in low-seam coal mines to provide support in difficult ground conditions. This paper describes cable bolting solutions at two low-seam coal mines in similar ground conditions. Both mines used support systems incorporating cable bolts as part of the primary support system. Two original cable bolt based support systems as well as two modified systems are evaluated to estimate their ability to prevent large roof falls. One of the support systems incorporated passive cable bolts, while the other used pre-tensioned cable bolts. The results and experience at the mines showed that the modified systems provided improved stability over the original support systems. The presence of the cable bolts is the most important contribution to stability against large roof falls, rather than the details of the support pattern. It was also found that a heavy steel channel can improve the safety of the system because of the ‘sling’ action it provides. Additionally, the analysis showed that fully-grouted rebar bolts load much earlier than the cable bolts, and pre-tensioning of the cable bolts can result in a more uniform distribution of loading in the roof.

Establishment of Coal-rock Constitutive Models for Numerical Simulation of Coal-rock Cutting by Conical Picks

“…At present, a large number of simulation about rock-cutting have been done at home and abroad [1,3,[15][16][17][18][19][20][21][22]. For verifying the accuracy of the elastic-brittle-plastic constitutive model, numerical simulation and experimental study were carried out.…”

The Evaluation of Negative Anthropogenic Factors Subjection on Bolts Stability and Surrounding Massif Deformations

“…The results interpretation of bolts stability was made according to recent investigations [9][10][11][12][13][14]. The calculation (2, 3) results shown in table 1.…”

Shale Failure Mechanics and Intervention Measures in Underground Coal Mines: Results From 50 Years of Ground Control Safety Research

“…The illustration shows configurations for cable bolt locations as secondary support in between primary support rows and also cable bolts included in the same row as primary support. For these scenarios, a study was conducted to evaluate the general ground response to gage the effects of the support system configurations (Esterhuizen 2015). …”

“…Schematic illustration of different support patterns showing locations of primary support ( solid bar bolts ), cable bolts and T3 channels ( not to scale ) (from Esterhuizen 2015)…”