Application of Small-aperture Hydraulic Fracturing Method in the Measurement of In-situ Stress of Yangquan Minmetals
With the increase of the mining depth and breadth of Yangquan Minmetals,in view of the significant changes in the stress environment,deformation and failure characteristics of the coal and rock mass,this paper adopts the methods of field measurement and theoretical analysis:the small aperture hydraulic fracturing method is used to measure and count the original rock stress and direction of 9 measuring points in the roadway of Yangquan Minmetals mining area,and the spatial distribution characteristics of in-situ stress and the variation law with buried depth are analyzed.The results are consistent with the existing horizontal principal stress research results in this area.The results show that the maximum values of horizontal principal stress and vertical principal stress in Yangquan Minmetals area are 12.58 MPa and 15.08 MPa,respectively,and the average values are 6.73 MPa and 11.88 MPa,respectively,and the maximum horizontal principal stress direction is in the range of N61° E～N79° E.The range of the pressure measurement ratio is between 0.12～1.53,and the vertical principal stress is less than the maximum horizontal principal stress in the shallow area,and the vertical principal stress is greater than the maximum horizontal principal stress with the increase of buried depth.In addition,the geological structure and the advance support pressure also have a certain influence on the in-situ stress distribution in the local area.
NETL
NSTL
万方数据
