Geophysical methods for coal seam variability detection in front of mining face. Report No. 1, state of the art report
Problems in detecting geologic faults or washouts in coal seams by the use of seismic waves are considered. For transmission, the shot point should not be greater than 500 m from the detection point. A minimum thickness of the seam for transmission is equivalent to the lower limit of thickness for mining. The interpretation of the results is more difficult for thick seams (25 m) and the resolution is lower. The throw of a fault should be equal to the seam thickness or greater; throws of half the thickness can be detected only in favorable conditions; the fault must not be parallel to the propagation. The nature of the fault or washout cannot usually be determined. Problems are even greater when use is made of reflected waves: shorter distances (< 250 m), inclination to seam plane must be 25 to 30/sup 0/ and angle of incidence at a plane of the seam is equal to the angle of reflection. The theory of such measurements is given, the use of models for interpretation considered; the availability of equipment; and the processing of the data are discussed. (LTN)
- Research Organization:
- Glowny Inst. Gornictwa, Katowice (Poland)
- OSTI ID:
- 6590129
- Report Number(s):
- DOE/TIC-11444
- Resource Relation:
- Other Information: Work performed under the Joint Reseach Project through the Maria Sklodowska-Curie Joint Fund
- Country of Publication:
- United States
- Language:
- English
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GEOLOGIC STRUCTURES
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SEISMIC WAVES
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