Reinforcement of Underground Excavation with Expansion Shell Rock Bolt Equipped with Deformable Component
| Autor: | W. Korzeniowski, Krzysztof Zagórski, Krzysztof Skrzypkowski |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Rock bolt
Engineering 0211 other engineering and technologies Shell (structure) rock bolting expansion shell rock bolt stiffness 02 engineering and technology mining 020501 mining & metallurgy Component (UML) deformable component TA703-712 Geotechnical engineering Computers in Earth Sciences Reinforcement 021101 geological & geomatics engineering Civil and Structural Engineering business.industry Excavation Structural engineering Engineering geology. Rock mechanics. Soil mechanics. Underground construction Geotechnical Engineering and Engineering Geology 0205 materials engineering Mechanics of Materials Porous medium business |
| Zdroj: | Studia Geotechnica et Mechanica, Vol 39, Iss 1, Pp 39-52 (2017) |
| Popis: | The basic type of rock mass reinforcement method for both preparatory and operational workings in underground metal ore mines, both in Poland and in different countries across the world, is the expansion shell or adhesive-bonded rock bolt. The article discusses results of static loading test of the expansion shell rock bolts equipped with originally developed deformable component. This component consists of two profiled rock bolt washers, two disk springs, and three guide bars. The disk spring and disk washer material differs in stiffness. The construction materials ensure that at first the springs under loading are partially compressed, and then the rock bolt washer is plastically deformed. The rock bolts tested were installed in blocks simulating a rock mass with rock compressive strength of 80 MPa. The rock bolt was loaded statically until its ultimate loading capacity was exceeded. The study presents the results obtained under laboratory conditions in the test rig allowing testing of the rock bolts at their natural size, as used in underground metal ore mines. The stress-strain/displacement characteristics of the expansion shell rock bolt with the deformable component were determined experimentally. The relationships between the geometric parameters and specific strains or displacements of the bolt rod were described, and the percentage contribution of those values in total displacements, resulting from the deformation of rock bolt support components (washer, thread) and the expansion shell head displacements, were estimated. The stiffness of the yielded and stiff bolts was empirically determined, including stiffness parameters of every individual part (deformable component, steel rod). There were two phases of displacement observed during the static tension of the rock bolt which differed in their intensity. |
| Databáze: | OpenAIRE |
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