Abstract
The stress-strain state of test specimens of the new combined structure of support of a mine opening under loads is studied. The test specimens are compound modular elements of the designed earlier combined structure of support. Every single modular element is the triangular prism, consisting of a reinforced concrete slab and a steel grid made of tube web members. The slab and web members are grouped in a complete element while concreting the slab. The tension sensor’s method of experimental investigation is applied to the testing specimens. Tests of specimens are carried out under the load forced with cargoes. Loads are set in the ways that to simulate service conditions, counting the most adverse. Design features of the support and test specimens are shown. Particulars of the support and its elements, production technology, assemblies as well as the sizes are briefly described. The methodology of testing specimens, as well as the analysis of the outcomes, are presente.
Highlights
To mine working depending on their purposes as well as hydrological and geological conditions, some techniques are used
The steel frame-arch supports are often used for mine opening [8]
Experimental researches of the combined elongate structural elements of a mine opening were conducted, as a result, the delivered goal was reached, such as the new data is established that has both the scientific novelty and the practical value as well as gives awareness about specificities of structure behavior under loading, as well as both the stress-strain state and the efficiency of the structure are established
Summary
To mine working depending on their purposes as well as hydrological and geological conditions, some techniques are used. In all cases to mine working there is necessary to erect supports – structures for prevention of fall dawn of the soil or rocks, as well as ensuring the service condition, and the design parameters and sizes of the mine openings. Notable deterioration in mining-and-geological conditions is observed, resulting in the existing supports steadily undergoes physical depreciation [1,2,3,4]. The coal mining working practice shows that the cost of renovation and maintenance in operating conditions of the supports can be as high as 10% of the value of the coal. The steel frame-arch supports are often used for mine opening [8]
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