Distribution characteristics and complexity evaluation method of in-situ stress field in the Ningzheng-Binchang coal mining area
CHENG Xianggang
QIAO Wei
DOU Linming
HUANG Yanli
HE Hu
GONG Siyuan
FENG Peichao
ZHANG Jinkui
LI Yongyuan
Abstract：Accurately characterizing the spatial heterogeneity of rock mass stress environments and evaluating the tectonic-geomechanical coupling complexity of coal mine stress fields therefore exert critical significance for both coal resource exploitation optimization and disaster-resilient under-ground infrastructure design.Ningzheng-Binchang mining area was taken as the study area,ex-plores the current tectonic stress pattern and the characteristics of the in-situ stress field through the regional tectonic evolution analysis,focal mechanism interpretation,and in-situ stress test.Based on the decomposition of principal stresses and considering the three-dimensional stress state of rock masses,a stress state index used to characterize the differences in the in-situ stress environment of rock masses was proposed.By selecting four indicators,namely the mining depth of the coal seam,the maximum horizontal principal stress,the strength-stress ratio of the surrounding rock,and the in-situ stress difference parameter,an evaluation model for the complexity of the in-situ stress field of coal mine was constructed.The results show that the focal mechanisms types of study area are diverse and the macroscopic stress field is under the action of tectonic stress with torsion-compres-sion and compression,with the property of slipping around the intermediate principal stress.More-over,the fitting curves of the horizontal maximum principal stress with the change of depth signifi-cantly exceeds the national average level of coal mines in China,and is mainly in the near northeast-southwest direction.The stress state index at some measurement points in Hujiahe coal mine,Gao-jiapu coal mine,and Tingnan coal mine exceeds 2.7,indicating significant differences in surround-ing rock stress in these regions.The complexity index of the in-situ stress field in the central and northern parts of the study area is relatively high,with local values above 0.8.The overall area near the southern and Yadian coal mines is below 0.3,and the evaluation results are basically con-sistent with the actual situation of rock burst in the study area.
Keywords：Ningzheng-Binchang mining areain-situ stress fieldseismic source mechanism analy-sisstate representationdegree of complexity
Publication Date：2026-03-31
Online Publishing Date：2026-04-08(First online date of this platform, not the publication date of the document)
Pages：15( 499-513 )