Abstract
The northwest region of the Jiaodong Peninsula has a complex geological environment that experiences frequent microseismic activity. In situ stress magnitudes and orientations in three underground gold mines (i.e., Sanshandao, Xincheng, and Linglong gold mines) were obtained by an improved overcoring technique with a hollow inclusion strain gauge from 53 measuring points, and the distribution characteristics of the in situ stress field were analyzed. The results show that the stress field is characterized by σH > σh > σv and σH > σv > σh (where σH, σh, and σv are maximum horizontal, minimum horizontal, and vertical principal stresses, respectively). The regional stress field is dominated by the horizontal principal stress in the measurement depth ranges. The σH is dominantly oriented in the NWW–SEE or near E–W direction, which is, in general, in agreement with those interpreted by focal mechanism solutions, geodesic leveling analysis, and GPS data. The stress accumulation in the study area is at moderate and low levels under the present tectonic stress state, and the superficial crust is in a relatively stable state. The stress accumulation in the thrust stress state and the strike-slip stress state are mostly moderate.
Abbreviations
- σ 1 :
-
Maximum principal stress
- σ 3 :
-
Minimum principal stress
- σ H :
-
Maximum horizontal stress
- σ h :
-
Minimum horizontal stress
- σ v :
-
Vertical stress
- H :
-
Depth
- K H :
-
Ratio of the maximum horizontal stress to the vertical stress
- K h :
-
Ratio of the minimum horizontal stress to the vertical stress
- η :
-
Ratio of the maximum horizontal stress to the minimum horizontal stress
- μ :
-
Friction coefficient of the fault
- μ m :
-
Ratio of the maximum shear stress to the average stress
- P 0 :
-
Pore pressure
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Acknowledgements
This study was funded by the State Key Research Development Program of China (Nos. 2016YFC0600703 and 2017YFC0804103) and the National Key Basic Research Program of China (973 Program) (No. 2015CB060200).
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Li, P., Cai, Mf., Guo, Qf. et al. In Situ Stress State of the Northwest Region of the Jiaodong Peninsula, China from Overcoring Stress Measurements in Three Gold Mines. Rock Mech Rock Eng 52, 4497–4507 (2019). https://doi.org/10.1007/s00603-019-01827-3
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DOI: https://doi.org/10.1007/s00603-019-01827-3