Measurement and Characteristics Analysis of In-situ Stress in Expanding Area of Tao'er Coal Mine

摘要

In order to fully understand and correctly evaluate the stability of overlying strata and surrounding rock, in-situ stress of south main roadway, north main roadway and bypass in shaft station of expanding area, Tao'er coal mine was tested by KX-81-style triaxial stress gauge of hollow inclusion. The test results show that tectonic stress is main in in-situ stress of expanding area, Tao'er coal mine, horizontal principal stress is westeast distribution, 31.13-27.42MPa size, 27.42°-275° direction. Each stress state is not identical, vertical stress is basically slightly less than the weight of the rock covering on unit area. Application of measuring principle of in-situ stress and analysis of field measurement provide a reliable basis for roadway support design and parameters optimization in expanding area of Tao'er coal mine, ensure safety and smooth construction of roadway.