Abstract
The new support patterns have been revealed for controlling the combinations of the roof rocks strengthening processes in extraction mine workings with combined roof-bolting systems. It has been established that in adjacent roof rocks, by means of a combination of rope bolts and resin-grouted roof bolts, an armored and rock plate is formed, the high load-bearing capacity of which is achieved by maintaining the horizontal thrust forces that reduces the concentrations of all the stresses components to a level many times lower than the strength characteristics of the lithotypes. The criterion has been substantiated for assessing the resistance level of roof-bolts as a part of the combined roof-bolting system, which is used for determination of the most important geomechanical factors in terms of the system loading degree. The patterns have been established of a degree of loading the roof-bolts being a part of the combined roof-bolting system from the main influencing geomechanical factors. The calculated expressions have been obtained to determine the needed parameters for effectively strengthening the roof in workings by a combined roof-bolting system. The mine experiment analysis has been performed as well.
Highlights
There is an advanced and ever-growing trend of the gap between the high level of modern technologies in stoping faces and the possibilities of timely preparation for extraction panels mining
The second very effective direction in reducing the volumes of driving and maintenance of site workings with high-performance work of production units is to reuse them with stability increase by the rock massif strengthening with combined bolting systems as part of the resin-grouted and rope bolts
The efficiency of using such combined bolting systems for complex mining and geological conditions can be realized to the full by establishing the patterns of its elements loading in dependence to main geomechanical factors
Summary
There is an advanced and ever-growing trend of the gap between the high level of modern technologies in stoping faces and the possibilities of timely preparation for extraction panels mining. The second very effective direction in reducing the volumes of driving and maintenance of site workings (by 1.7 – 1.8 times) with high-performance work of production units is to reuse them with stability increase by the rock massif strengthening with combined bolting systems as part of the resin-grouted and rope bolts. This significantly reduces material and labor costs due to border rocks involvement into counteracting to the rock pressure. The objective of our research is substantiation the system parameters of supporting mine workings by resin-grouted and rope bolts
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