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Published on 12 January 2018


O. Z. Gabaraev, Yu. V. Dmitrak, K. Drebenshtedt, V. I. Savelkov

A complex of studies of the mechanism of interaction of destroyed geomaterials and the ore-bearing massif was carried out during the development of the site of the mined impregnated ores in the field of the “Komsomolsky” mine. Within the considered ore field, the reserves of the underlying deposit of continuous ores lying at a depth of 550-600 m are extracted. The excavation is performed by systems with filling of the worked out space with hardening mixtures with strength of 4-6 MPa. In the course of work on continuous ores, a network of haul out workings on 371 m horizon and ventilation and filling workings on 300-330 m horizons is
preserved. The initial stress state of the massif is close to hydrostatic. Studies have shown that with the increase in the span of work, the zone of maximum displacements widens, in which the time-dependent roof subsidences continues. The greatest deformations are exposed to rocks in the interval up to 40-60 m from the roof of continuous ores. The size of the subsidence with the maximum near the bottom line is determined by the compression characteristic of the filling massif and its thickness, and the inflection parameters by the deformation properties of the overlying strata. Rational management of the ore-bearing massif in developing the previously mined ore is secured by the developed technology of feeding the filling massif into the broken ore. It has been established that during the full-height excavation of deposits the lower part of the chamber is supported by the broken and ore-gassed ore, while the durability of the upper part is increased due to intensive filling of the spent ore and reducing the time of the chamber being open. The parameters of drilling and blasting operations in breaking the lower part of the room are selected to secure for the broken ore to preserve its flowing and supporting properties. The studies of the properties of the massif with hardening filling showed: - the filling tensile strength is above 0,39 MPa; - the bond of the filling with the concrete walls of the previously installed rooms is not less than сцепление 2,5 MPa; - the bond with the rock wall depends on the durability of the filling and varies from 1,54-1,63 MPa. As a result of the studies high-performing models of chamber-mining systems providing filling the spent ore were developed, securing effective management of the ore-bearing massif in developing the previously mined ore. The technologies provide high durability of the mined ore and allow decreasing losses and contamination of ore.

CityVladikavkaz, Freiberg
CountryRussia, Germany
Issue2017, №4(Т.9)
Key wordshardening mixtures, various-strength compositions, deformations, massif hardening, development technology.
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Categories: Technical-and-Technological-Issues-of-SDMT

Tags: твердеющие смеси, разнопрочные составы, деформации, упрочнение массива, технология разработки

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ISSN 1998-4502 (Print)                                                            ISSN 2499-975Х (Online)