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Określenie przyczyny wysokoenergetycznych wstrząsów górotworu na podstawie parametrów mechanizmu ognisk
| Content Provider | Semantic Scholar |
|---|---|
| Author | Stec, K. |
| Copyright Year | 2017 |
| Abstract | The aim of the research was to determine the cause of high-energy rock mass tremors (energy E ≥ 1,0E+05 J) in the area of longwall A located in seam 505/2, in the western part of the main saddle in the Upper Silesian Coal Basin. The research employed the method of seismic moment tensor inversion which provides parameters of focal mechanism (percentage share of its components: isotropic, uniaxial compression or tension, shear component; trend and dip of nodal planes, directions of tension axes and compression stress). The parameters describe processes occurring in focuses of tremors and they are clearly linked with stress conditions in a given area. Based on the obtained parameters, the directions of principal stresses s1, s2, s3 were determined, as well as other parameters such as: parameter R = (s2-s3)/(s1-s3); normal stress s and shear stress t, assuming that s1 = 1 and s3 = 0; direction of Shortening/Extension axis; direction of horizontal stress. The research showed that the cause of the occurrence of high-energy tremors while exploitations longwall A mining seam 405/2, was the dynamic destruction of roof rocks which could displace towards the cavity created after mining the seam. An additional factor significantly magnifying the process was the share of stresses, which originate from the faults in the area, existing in the rock mass. The results of the research provided additional information to determine the degree of rockburst hazard in the area. Due to the very dangerous work conditions (stress parameters reflect the rock mass of high shear strength, where dynamic influence of tremors is stronger) additional preventive actions – distress blastings were made in this area. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://journals.pan.pl/Content/109254/PDF/Stec.pdf?handler=pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
