Study on In-situ Stress Measurement and the Stability of Roadways

In-situ stress is a basic parameter to the stability of surrounding rocks and supporting structure of underground projects. Stress measurement was carried out at Tangkou Coal Mine of Shangdong province at three different structural positions, each as deep as 1024-1030 m, in the ventilated and the west assistance conveyance stone door by hollow inclusion measuring method. This paper provides a detailed introduction of the calculation of the 3D in-situ stresses and principal stresses, and with reference to the measured stress data analyzes the strength of in-situ stresses, changes of directions and distribution characteristics, and further obtains set data about in-situ stresses in the mine area. This paper also gives a primary analysis of the effect of in-situ stresses on the stability of roadways, which provides reliable reference for the design of supporting structure.