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Showing 1 to 9 of 9 for “"roof support"”.
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Some factors in the use of roof bolts for mine roof control
… of stresses often time cause catastrophic roof-falls which kill and injure miners and damage equipment. Attempts are made to control these unbalanced stresses by choosing the proper method of mining and suitable method of roof support. About 20 years ago, the St. Joseph Lead Company in …
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Optimizing roof control using probabilistic techniques in roof failure prediction
… underground mine is the reliable prediction of roof falls' size, frequency and location. Probabilistic simulation of potential roof control problems allows a designer to test the performance of competing mine layouts against assumed roof conditions. By comparing different roof control plans …
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Evaluation of underground supports made of wood and other materials
A roof support system is one of the most important systems in underground mining. It may consist of various types of supports such as props, cribs, steel arches, powered supports and roof bolts, among others. In this research, powered supports and roof bolting are not included. Evaluation of …
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Geologic feature prediction using roof bolter drilling parameters
The design of a safe and efficient roof support system is essential for any underground coal mining operation. All underground coal mines in the United States install roof bolts with a roof bolter as the primary means of supporting the mine roof. Proper application of roof bolting is dependent upon …
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Stochastic availability analysis and modeling of longwall mining operations
… four subsystems: coal—cutting, face—conveying, roof—support, and outby—haulage. The operating characteristics of the longwall system are then investigated based on the system configuration, component failure and repair processes, and rules of operation. Through use of the techniques of …
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Longwall weighting events at Phalen Colliery, Nova Scotia, Canada
… by high convergence rates within the powered supports which maintain roof stability along the longwall face. Rapid convergence is induced by ground pressures that exceed the load capacity of the supports, and forces them to yield. A weighting event need not necessarily impact the mining …
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Applications of Surface and Subsurface Subsidence Theories to Solve Ground Control Problems
… stress concentrations, geological conditions and support intensities etc. In particular, the ground control stability associated with large movements and deformations of the strata is much more complicated and could induce much more severe safety problems. A ground control failure could endanger …
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A New Rock Bolt Design Criterion and Knowlwdge-based Expert System for Stratified Roof
… the 1920s, bolting has become the most dominant support method in underground construction. However, because of the geological environment, the design process for roof bolt systems is an art rather than a science. To quantify the selection of bolting systems a MSBT (minimum solid beam thickness) …