Repository logo

Browsing by Subject "fractured zone"

Filter results by typing the first few letters
Now showing 1 - 1 of 1
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Estimation of the range of fractured zone in the roof of underground roadways using the seismic method
    (Wydawnictwa AGH, 2005) Jarosz, Jacek
    It is a well-known truth that each mining activity changes the natural stress field in the rock mass. Driving of underground roadways leads to the appearance of a fractured zone around the excavated space. Separated and fractured roof rocks of underground roadways possess significant danger to the safety of people working in the mine. Knowledge of the thickness of the fractured zone is very important to the process of protecting roadways and particularly to determine conditions of roof bolting. A new way of use of a seismic method to estimate the parameters of fractured zones is described in this paper. The Love-type interference waves generated by hammer blows in roadway roof rock are discussed. The results of field measurements in a coal mine are presented.