平顶山矿区构造应力场演化规律及分布特征

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Abstract To investigate the evolution pattern and distribution characteristics of tectonic stress field in Pingdingshan mining area，based on conjugate shear joints，fault slickenside and structure of the mining area data，the Stereographic projection method was applied to restore the direction of the paleotectonic stress in the research area. The characteristics and evolution pattern of the paleotectonic stress field were analyzed. By means of collecting in-situ stress and focal mechanism solution data，the tectonophysics and rock mechanics methods were applied to analyze the magnitude and direction of the present tectonic stress. The distribution characteristics and partitioned graph of the present tectonic stress field were got. The reconstruction results of the paleotectonic stress field showed that the mining area mainly got through three periods of tectonic stress field movement including Indosinian period，Yanshanian period(including Early and Late period) and Himalayan period. The directions of the maximum principal stress were nearly NS，NW，NE and NNE，respectively. The preferred attitudes of the directions were 3°∠6°，313°∠13°，54°∠9° and 18°∠15°. Under multistage tectonic stress field，Pingdingshan mining area formed geological structure on a series of NWW–NW directions folds and faults with NNE–NE directions secondary faults under the control of Likou syncline. The analytical results of the present tectonic stress field showed that the mine area has the partitioned characteristics. As the whole，the mining area manifests as dynamic stress field. The stress field type of the normal fault dominates absolutely in the west mining area. The stress field type of the strike-slip fault dominates absolutely in the middle mining area. The stress field type of the reverse fault and the strike-slip fault dominates in the east mining area. The mining area belongs to high stress region. In the regional mining area，the trend of the stress value is in a gradually increasing process from the west area to the east area. The stability of the stress field is between the relative stable state and the critical state. The maximum horizontal principal stress direction is NEE. The direction of the principle stress have undergone obvious changes in near faults. With the increasing of the buried deepness，the principal stress is gradually increasing，the coefficient of the horizontal pressure is decreasing，and the stress field has the changing tendency from dynamic to static. Research results provide the scientific basis for guiding mine roadway layout and preventing coal and rock dynamic disaster in mining area.

Key words： mining engineering Pingdingshan mining area tectonic stress field tectonic analysis evolution pattern distribution characteristics

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	Articles by authors
	GUO Deyong1
	CHUAI Xiaosheng1
	ZHANG Jianguo2
	ZHANG Haoquan2

Cite this article:

GUO Deyong1,CHUAI Xiaosheng1,ZHANG Jianguo2, et al. The evolution pattern and distribution characteristics of tectonic stress#br# field in Pingdingshan mining area[J]. , 2022, 41(6): 1208-1222.

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https://rockmech.whrsm.ac.cn/EN/Y2022/V41/I6/1208

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