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Depletion-induced seismicity in NW-Germany: lessons from comprehensive investigations

Gudehus, Gerd 1; Lempp, Christof; Scheffzük, Christian 2; Műller, Birgit I. 2; Schilling, Frank R. 2
1 Institut für Bodenmechanik und Felsmechanik (IBF), Karlsruher Institut für Technologie (KIT)
2 Institut für Angewandte Geowissenschaften (AGW), Karlsruher Institut für Technologie (KIT)


Evaluating various investigations for north-German gas fields, we discuss past and actual evolutions of the rock fabric in the light of dilatant driven and spontaneous contractant critical phenomena. Features of the latter were discovered by multi-stage triaxial tests with water-saturated sandstone samples and were similarly observed around the gas fields. A Mohr–Coulomb condition with quasi-local stress components (${\hat{\sigma }}'_1$ and ${\hat{\sigma }}'_3$), and variable parameters ϕ’ and ${{\hat{c}}}'$, can capture successive critical states of the solid fabric. The implied driven dilatation up to a collapse with contraction is captured by a stress-dilatancy relation. Fractal patterns of shear bands (faults) dominate if the smallest principal stress ${\hat{\sigma }}'_3$ exceeds ${{\hat{c}}}'$, otherwise cracks dominate and can lead to a rockburst. Triaxial tests with X-ray attenuation, seismometry including the splitting of shear waves and/or neutron beam diffraction contribute to clarification and validation. Seismic early warning and calculation models for various geotechnical operations with dominating faults can thus be improved, but the task is more difficult for rockbursts.

Verlagsausgabe §
DOI: 10.5445/IR/1000149078
Veröffentlicht am 27.07.2022
DOI: 10.1007/s11440-022-01513-9
Zitationen: 1
Web of Science
Zitationen: 1
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Geowissenschaften (AGW)
Institut für Bodenmechanik und Felsmechanik (IBF)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2022
Sprache Englisch
Identifikator ISSN: 1861-1125, 1861-1133
KITopen-ID: 1000149078
Erschienen in Acta Geotechnica
Verlag Springer
Band 18
Heft 2
Seiten 951–969
Vorab online veröffentlicht am 05.07.2022
Nachgewiesen in Dimensions
Web of Science
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