›› 2013, Vol. 34 ›› Issue (8): 2329-2336.

• Geotechnical Engineering • Previous Articles     Next Articles

In-situ stress measurement of deep borehole in Shandong segment of Tan-Lu fracture belt and analysis of its activity

ZHANG Peng1, 2, QIN Xiang-hui1, 2, FENG Cheng-jun1, 2, SUN Wei-feng1, 2, TAN Cheng-xuan1, 2   

  1. 1. Key Laboratory of Neotectonic Movement & Geohazard, Ministry of Land and Resources, Chinese Academy of Geological Sciences, Beijing 100081, China; 2. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
  • Received:2012-05-24 Online:2013-08-12 Published:2013-08-13

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Abstract: Analysis of earth surface displacement using GPS and deep focal mechanism show that present activity in the Shandong segment of Tan-Lu (Tancheng-Lujiang) fracture zone exhibit a clockwise compression-torsion characteristics in between the shallow earth crust and deep zone of the region after the 2008 Japan earthquake. Data was gathered from 25 in-situ stress sensors installed at varying intervals along the total depth of single 600 m borehole located inside a granite rich region at the northeast part of Shandong. Combined with in-situ stress data, core sampling of the structural features of shallow earth crust rock formations reveals that current horizontal principal stresses play a leading role in strike-slip fault activity. Moreover, measured maximum principle in-situ stress mechanics trend towards the east-west direction and reflects present compressive properties, with dextral slip activity, of the Shandong segment. Including pre-existing data of surface and subterranean experiments, this new data will allow us to open new research avenues for understanding the present active features of the Shandong segment of the Tan-Lu fracture belt.

Key words: Tan-Lu fracture belt, hydraulic fracturing, in-situ stress measurement, Coulomb criterion, strike-slip fault

CLC Number: 

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