Abstract

Relatively accurate data regarding the temperature distribution in a rock mass can be obtained from measurements carried out in short boreholes drilled directly into mine workings. Such thermal field measurements were undertaken in selected mine workings in all active mines of the Ostrava-Karviná District (OKR), situated in the Czech part of the Upper Silesian Coal Basin. A temperature field survey of the rock mass at high depths was performed in the years 2011–2013, with a total of 204 valid in situ measurements of initial temperature in the carboniferous rock mass recorded, ranging from 27.0°C to 48.9°C. All measurements were registered in a newly created database.

During the project, many archival sources of individual temperature measurements made in the OKR were found, complementing and extending the existing knowledge base regarding the distribution of the temperature field.

A new spatial distribution model of primary temperature values for the carboniferous massif in the Czech part of the Upper Silesian Coal Basin was the final output of the presented project. The main purpose of this spatial modelling and data visualisation was to create an image of the area's complex topological arrangement based on the available data. Following the generated thermal model, a 3D map of OKR temperature fields at around 1000 m depth was generated. In order to determine the temperature at a particular position in the thermal model, an executable plugin was created. It is also possible to import the final thermal model of the carboniferous massif in the Czech part of the Upper Silesian Coal Basin into commercial computational software for the determination of appropriate mine air conditions.

1. Introduction

Mining activities involved in the extraction of energy resources in the Czech Republic are reaching ever more significant depths, a phenomenon that has led to increased consideration of mine worker safety, as well as the indirect safety of the general public. The project "Mine workings design and direction at depths of 800 metres and greater" focuses on the safe direction and operation of mine workings at depths exceeding 800 metres, due to the fact that at such depths, increased rock stresses and temperatures may lead to potentially dangerous anomalous stress phenomena or disturbances in ventilation and air quality. The latter in particular require specific procedures to be undertaken by the national Mines Rescue Service when dealing with such emergency situations.

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