A model of rock mass fracturing ahead of the longwall face as a consequence of intensity of exploitation

Title:

A model of rock mass fracturing ahead of the longwall face as a consequence of intensity of exploitation

Creator:

Drzewiecki, Jan and Makówka, Janusz

Identifier:

https://cdk.lib.cas.cz/client/handle/uuid:0626219a-3cc5-4c73-adfd-6f64a53b3460
uuid:0626219a-3cc5-4c73-adfd-6f64a53b3460
doi:10.13168/AGG.2013.0013
issn:1214-9705

Subject:

Geologie. Meteorologie. Klimatologie, geodynamika, geodynamics, 7, and 551

Type:

article, články, model:article, and TEXT

Format:

print, bez média, and svazek

Description:

In Czech and Polish underground hard coal mines of the Upper Silesian Coal Basin high-energy seismic phenomena are periodically recorded, the sources of which are located ahead of the longwall. Generally, these types of tremors are rooted in very strong, thick layers of sandstone, which are subject to the deformation border. The consequences are discontinuities and cracks with a range depending on the mechanical properties of destroyed rocks: the mechanical parameters of layers. Forecasting methods, developed in the Central Mining Institute, for stress concentration, seismic energy, fault zone and range, together with methods of rock fracturing using liquid or explosives, ,allow precise identification of suitable locations for controlled fracturing of rock mass with a pre-established direction. The size and range of discontinuities have an impact on mining parameters, dependent on basic exploitation intensity and expressed by the average daily progress of the longwall face. The rockmass is locally weakened because of exploitation or technical measures of discontinuities in the roof-rock on the longwall face. To prevent rockburst, measures are needed to reduce the amount of energy accumulating in the rockmass in the area of the longwall face. Knowledge of where stress is concentrated is extremely important for the development and implementation of effective preventative methods. For many years several research centres have been working on defining the range of these areas. In this paper, basic information is presented on methods developed by Central Mining Institute and used in Polish hard coal mines for forecasting energy concentration and assessing how it can be reduced., Jan Drzewiecki and Janusz Makówka., and Obsahuje bibliografii

Language:

English

Rights:

http://creativecommons.org/licenses/by-nc-sa/4.0/
policy:public

Source:

Acta geodynamica et geomaterialia : | 2013 Volume:10 | Number:2 (170)

Harvested from:

CDK

Metadata only:

false