Substantiation of cable bolts parameters for supporting mine workings in conditions of laminated rocks
Yu. Khalymendyk1, A. Baryshnikov1
1Mine Surveying Department, National Mining University, Dnipropetrovsk, Ukraine
Min. miner. depos. 2016, 10(1):9-15
https://doi.org/10.15407/mining10.01.009
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ABSTRACT
Purpose.The development of approaches to substantiation of the cable bolts installation parameters for the mine workings support in conditions of laminated rocks, taking into account the geometric parameters of the rocks disintegration zone.
Methods.The parameters of the rocks disintegration zone in the roof of a single mine working and a mine working in the area affected by longwall work are determined by in-situ investigations.
Findings.The existing approaches to the cable bolt installation parameters are considered. The rock deformation mechanism around a single mine working is introduced. The results of the experimental supporting of mine working with roof bolts in conditions of Western Donbass are analyzed. The results of studying rock mass deformation in the roof of the gateroad in the area affected by longwall work are presented.
Originality. The deformation of the rock mass around a single mine working occurs in the form of wedges extruding laminated rocks in the soil and the roof. Behind longwall face, the zone of rocks disintegration is formed at a height of 6 m in the roof and the overlying strata sag by up to 0.2 m without delaminating.
Practical implications. Taking into account the geometric parameters of the rocks disintegration zones, the installation parameter of cable bolts for the mine working roof support are substantiated. Experiments proved that increase in of the cable bolt installation density reduces intensity of the gateroad roof rock deformation at the face – end.
Keywords: cable bolt, laminated rocks, mine working, rock disintegration zone, in-situ investigations
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