Characteristics and implications of stress state in a gold mine in Ludong area, China
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In this study, we obtained information from twenty-one measurement points on the stress magnitudes and orientations of a gold mine in the Ludong area. We used the overcoring technique with an improved hollow inclusion strain gauge and then analyzed the distribution characteristics of the in situ stress field. The results indicate that the stress field is characterized by σH > σh > σv and σH > σv > σh (where σH, σh, and σv are the maximum horizontal, minimum horizontal, and vertical principal stresses, respectively). The regional stress field is dominated by horizontal principal stress. The σH, σh, and σv values show a gradual increasing trend with depth. The σH is predominantly oriented in the NWW–SEE or near-EW direction. We also confirmed the correspondence between the measured stress field and the regional geological structure. In addition, based on the measured stress data, we discuss the implications of the in situ stress with respect to fault activity in the mine area.
Keywordsin situ stress measurement improved hollow inclusion strain gauge stress field geological structure fault activity
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This work was financially supported by the State Key Research Development Program of China (Nos. 2016YFC0600801, 2017YFC0804103, and 2016YFC0600703), and the National Key Basic Research Program of China (973 Program) (No. 2015CB060200).
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