Three-dimensional in situ stress determination by anelastic strain recovery and its application at the Wenchuan Earthquake Fault Scientific Drilling Hole-1 (WFSD-1)
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- 作者：DongSheng Sun (1) (2)
WeiRen Lin (3)
JunWen Cui (4)
HongCai Wang (1) (2)
QunCe Chen (1) (2)
YinSheng Ma (1) (2)
LianJie Wang (1) - 关键词：Wenchuan earthquake ; anelastic strain recovery ; compliance of anelastic strain recovery ; three ; dimensional in situ stress ; scientific borehole
- 刊名：Science China Earth Sciences
- 出版年：2014
- 出版时间：June 2014
- 年：2014
- 卷：57
- 期：6
- 页码：1212-1220
- 全文大小：
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WeiRen Lin (3)
JunWen Cui (4)
HongCai Wang (1) (2)
QunCe Chen (1) (2)
YinSheng Ma (1) (2)
LianJie Wang (1)
1. Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing, 100081, China
2. Ministry of Land and Resources, Key Laboratory of Neotectonic Movement and Geohazard, Beijing, 100081, China
3. Kochi Institute for Core Sample Research, Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Nankoku, 783-8502, Japan
4. State Key Laboratory for Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 100037, China - ISSN：1869-1897
文摘
In situ stress state becomes more and more significant with in-depth research on geodynamics and energy development. However, there has not been an economic and effective method developed to determine deep three-dimensional in situ stress. The Anelastic Strain Recovery (ASR) method is a newly developed technique that can determine three-dimensional in situ stresses. After the 12 May 2008 M s8.0 Wenchuan earthquake, the ASR method was used for the first time in mainland China to measure the in situ stresses in the WFSD scientific boreholes in Sichuan Province, China. In this paper, the basic procedure of the ASR method is introduced in detail and the compliances of ASR for boring cores are investigated. The results show that the maximum principal stress direction was NW64° at a measured depth (MD) of 1173 m (vertical depth 1151 m) in WFSD-1. The ratio of shear mode to the volume mode compliance of ASR was 2.9. And the three principal stresses at 1173 m MD in WFSD-1 are 43, 28 and 25 MPa. Combined with stress measurement results determined using other in situ measurement methods along the Longmenshan fault zone, the directions of the maximum horizontal principal stress changes from E-W to NEE-SWW to NWW-SEE when moving from NE to SW along the Longmenshan fault zone. This change is in agreement with the stress regime of the Longmenshan fault zone of the Wenchuan Earthquake, which supports a stress regime consisting predominantly of thrusts in the southwest and strike-slip in the northeast.