Measurement of Geostress in Kouzidong Mine Based on Hollow Envelope Strain Method
In order to understand the distribution law of geostress in the 1111 mining area of Kouzidong Coal Mine,geostress tests were conducted at three locations including the belt conveyor roadway in the 1111 mining area,and the depth of the test position was-855~-885 m.The results of the borehole stress relief test showed that the maximum principal stress σ 1 was the horizontal geostress,with the direction of NE92.0°~NE189° and the magnitude of 25.1~29.3 MPa,and the ratio of horizontal stress to vertical stress was 1.13~1.38.Obtain the distribution pat-tern of geostress:horizontal stress is the maximum principal stress,intermediate principal stress,and vertical stress is the minimum principal stress.This law provides basic geological data for the layout and the design of the roadway sup-port in 1111 mining area.
Hollow packageGeostress testStress relief methodGeostressRaw rock stress