关键词: 深部开采, 地应力测试,  水压致裂法, 围岩稳定性, 岩爆

Abstract: In order to solve the problems of poor stability of surrounding rock，complex geological structure and unclear in-situ stress conditions in the deep mining process of a lead-zinc mine in Longling County，Yunnan Province，ZK10306 borehole in the first mine section of the mining area is taken as the research object，and the in-situ stress test of five measuring sections was carried out in the depth range of 496.0 ~579.0 m by hydraulic fracturing method.Combined with impression test，linear fitting and Jethwa surrounding rock extrusion deformation classification method，the distribution characteristics of deep in-si⁃ tu stress and Rock Burst Risk in the mining area are systematically analyzed.The test results show that the vertical principal stress(Sv)，the maximum horizontal principal stress (SH)and the minimum horizontal princi⁃ pal stress(Sh)in the mining area increase linearly with the increase of depth.The three-dimensional princi⁃ pal stress relationship is Sv>SH>Sh，in which the maximum horizontal principal stress is 10.74 ~13.65 MPa， and the minimum horizontal principal stress is 7.32 ~9.03 MPa.The dominant direction of the maximum horizontal principal stress is northwest，and the stress structure type belongs to normal fault type.The strength stress ratio Rc/Smax of surrounding rock is between 0.74 and 0.94.The deep limestone and sand⁃ stone layers are mainly medium extrusion deformation，and the local part is slight extrusion deformation， which has certain extrusion failure and rock burst risk.The research results can provide reliable ground stress basis and theoretical support for the support design，mining layout optimization and geological disas ⁃ ter prevention and control of deep roadway in this lead-zinc mine.

Key words: deep mining, in-situ stress measurement, hydraulic fracturing method, stability of sur? rounding rock, rock burst