Abstract
The stress-strain state of test specimens of the new combined system of support of a mine opening under imposed loads is studied. The test specimens are compound modular elements of the offered earlier combined system of support. Every single modular element is the regular quadrangular pyramid, consisting of a reinforced concrete slab and steel tube web members. The slab and web members are gathered in a complete element while concreting the slab. The tension sensor’s method of experimental research is applied to the test of specimens. The test of specimens is carried out under the load imposed with a hydraulic press. The load is set so that to imitate service conditions, including the most adverse. Design features of the offered support and test specimens are presented. Details of the support and its elements, sizes, production technology and assemblies are briefly described. The test methodology of specimens and the analysis of the results are presented. The load-carrying abilities of test specimens under the concentrated force and uniform load are obtained. Break down of slab and connection between the web members and the slab are the results of the test of the specimens under the concentrated force and the uniform load respectively.
Highlights
For mine working depending on their purposes and hydrological and geological conditions, several ways are used
Notable deterioration in mining-and-geological conditions is observed that gradually promotes the physical wear of the existing supports
The well-known and approved experimental research technique of the full-scale test specimens under the load enclosed via a hydraulic press is used to solve the delivered problem
Summary
For mine working depending on their purposes and hydrological and geological conditions, several ways are used. The anchor and anchor-frame supports are applied to mine working [1], which have disadvantages: labor input and complexity of works at installation of anchors; lack of the high-performance drilling equipment of domestic production; the need for the expensive explosion-proof compressor mobile equipment. There are still many unexplored issues related to the design of the proposed support Some such questions are studying of stress-strain state of the combined elements and justification of the efficiency of their constructive concepts. In this regard, the purpose of the work is to establish the regularity of development of strains of extreme filaments in characteristic cross-sections of test specimens from load rate as well as to establish a load-carrying ability and actual damage of test specimens
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