Determining the qualitative composition of the equivalent material for simulation of Kryvyi Rih iron ore basin rocks

Abstract

Determining the qualitative composition of the equivalent material for simulation of Kryvyi rih iron ore basin rocKs purpose. To develop a model of composition of Kryvyi Rih iron ore basin through laboratory investigation of equivalent material. methodology. Methods of mathematic simulation and experimental research are used. findings. Conditions of model and prototype similarity are determined; dependencies of physical and mechanical properties of equivalent material rocks on percentage ratio of its components are developed. As a result of the research, it is established that while simulating rocks of Kryvyi Rih iron ore basin in laboratory conditions it is reasonable to use the equivalent material based on a sand-paraffin mixture containing granite chips, fine cast iron, quartz sand, mica and paraffin. The quantitative composition of the mixture is found to be similar to rocks of Kryvyi Rih iron ore basin in the following proportions: cast iron and granite chips-34 %, quartz sand, mica and paraffin-66 %. Approximation of the dependencies results in empirical equations of Poisson's ratio and the horizontal stress of the equivalent material which depend directly on the percentage of cast iron, granite chips and paraffin. Poisson's ratio and the horizontal stress of the equivalent material are proved to grow with the increasing percentage of paraffin in the equivalent material. originality. For the first time, there have been determined empirical dependencies of Poisson's ratio and ultimate strength of the material on the percentage of paraffin and cast iron. Poisson's ratio and the coefficient of the horizontal stress of the sand-paraffin based equivalent material depend on proportions of paraffin and cast iron and are described by the power function. practical value. The results of the laboratory investigations enable creation of a sufficiently precise rock mass model to investigate processes in rocks at underground development of iron ore deposits over time.

The study of the stress-strain state of the massif in mining uranium at “VOSTGOK” deposits

“…The solution for leaching uranium ores is fed from the existing workings over the room of the upper block. At this, volumes of mining are cut and pipes are again used for feeding the working solution to blocks [1][2][3].…”

“…Determining permissible dimensions of main structural element of room mining systems [main regulatory documents [1,2] however, do not consider the influence of the ore bed dip and are not intended for determining the safe thickness of a roof. The technology of underground block leaching of uranium ores in vertical double blocks is a new one to be applied at VostGOK underground mines and requires scientific support [4][5][6][7].…”

Development of resource-saving technology when mining ore bodies by blocks under rock pressure

“…Underground mining of ore bodies is performed at the depths of 1220-1350 m. Geometric parameters of ore bodies are as follows: along the strike length is 800-1200 m; thickness is 30-120 m; dip angles are 45-85° [5][6][7].…”

The study of the collapse zone by remote methods

“…To increase the stability of underground mine workings, effective development systems are developed and implemented, which allows to increase the safety of mining operations and to ensure minimal impact on the ground surface and objects located on it [7,8].…”