STUDY ON IN-SITU STRESS DISTRIBUTION LAW IN DEEP UNDERGROUND COAL MINING AREAS
Three typical deep coal mining areas, including Xinwen, Huainan, and Pingdingshan in China were chosen to take in-situ stress measurements by means of the hydrofracturing stress measurement rig with small borehole. 24 sites of stress measurements were carried out in 9 coal mines, with the maximum buried depth 1283 m, and the minimum 655 m. The stress measurementrigwithsmallborehole.24sitesofstressmeasurementswerecarriedoutin9coalmeasurement data point out that the types of in-situ stress fields in three coal mining areas are different. Xinwen coal mining area is intensively affected by tectonic movements with complex geological structures, so the in-situ stress fields are dominated by horizontal stresses, the tectonic stresses take absolute predominance, with the maximum horizontal principal stress up to 42.19 MPa, and the minimum horizontal principal stress up to 22.8 MPa. However, the in-situ stress fields are dominated by gravity stresses in Huainan and Pingdingshan coal mining areas. Based on the field data, the stress variation law with buried depth, and the relation between the specific values of the mean horizontal principal stresses to the vertical stresses and buried depth were analyzed. The in-situ stress measurement results were applied in roadway supporting design, and the roadway supporting states have been obviously improved.
H.Kang X.Zhang L.Si
Beijing Coal Mining and Design Branch, China Coal Research Institute, Beijing, China
国际会议
香港
英文
1-5
2009-05-19（万方平台首次上网日期，不代表论文的发表时间）