LI P T, FAN L D, YU Y Q,et al.Distribution characteristics of the in-situ stress field in the Pingdingshan Mining Area[J].Journal of Henan Polytechnic University(Natural Science) ,2026,45(2):186-194.

doi:10.16186/j.cnki.1673-9787.2024010048

Received:2025/03/21

Revised:2025/05/09

Published:2026/01/28

Distribution characteristics of the in-situ stress field in the Pingdingshan Mining Area

Li Peitao1, Fan Lidan1, Yu Yongqiang1, Zhang Jianguo1, Zhu Yuanguang2, Zhang Jiyun1

1.School of Civil Engineering， Henan Polytechnic University， Jiaozuo  454003， Henan， China；2.State Key Laboratory of Geomechanics and Geotechnical Engineering， Institute of Rock and Soil Mechanics， Chinese Academy of Sciences， Wuhan  430071， Hubei， China

Abstract: Objectives The distribution characteristics of the deep in-situ stress field in the Pingdingshan mining area is to be investigated.  Methods Based on an analysis of geological structure，a new method for delineating regional tectonic units was proposed using the main controlling structures—the Guodishan Fault and the Likou Syncline—as boundaries. Then， an analysis curve for the lateral pressure ratio was derived from the Hoek-Brown strength criterion to quantitatively assess the influence of regional geological tectonic on deep in-situ stress field. Results The results show that the deep in-situ stress field in each regional unit， influenced by different geological structures， exhibits different distribution patterns. The stress state in the western unit is predominantly normal faulting. Three kinds of stress states coexist in the central unit. The eastern unit is characterized mainly by the strike-slip and reverse faulting stress state. The vertical stress increases linearly with depth in all regional units. The mean value， variation range， and stress gradient of the maximum horizontal principal stress all increase from the west to the east. Similarly， the range and amplitude of the lateral pressure ratio increase from the west to the east， indicating that horizontal tectonic activity intensifies from the western to the eastern part ofthe mining area. The analysis of regional geological structures further reveals that the distribution of deep in-situ stress field follows the regional tectonic evolution law. The analysis of regional geological structures further reveals that the distribution of the deep in-situ stress field follows the regional tectonic evolution pattern. Specifically， the influence coefficient of regional tectonic stress field is highest in the eastern region （1.07）， followed by the central region （0.55） and lowest in the western region.  Conclusions Therefore， the evaluation method for regional geological structures based on the lateral pressure ratio analysis curve is applicable to the study of deep in-situ stress fields in the Pingdingshan Mining Area.

Key words: geological structure; in-situ stress field; distribution characteristics; lateral pressure ratio; Pingdingshan Mining Area