Research On In-situ Stress Measurement And Surrounding Rock Stability In Wangzhuang Coal Mine

In-situ stress is the natural stress existing in the earth's crust,which is not disturbed by engineering,also known as the initial stress of rock mass.The in-situ stress is the fundamental force that causes the deformation and damage of mining,water conservancy and hydropower,civil engineering,tunnel and other underground or open-pit geotechnical excavation projects.Therefore,the study of in-situ stress is of great significance.The influence of in-situ stress distribution on tunnel deformation cannot be ignored.As the roadway serving directly with the working face,the mining roadway will be disturbed many times during its service life,especially after the mining of the upper working face,the movement of the overlying strata and the transfer of the supporting pressure will cause certain damage to the roof of the lower working face along the trough,which brings severe challenges to the roadway support.Therefore,in-situ stress is the basis of roadway design.Taking Wangzhuang Coal Mine of Shanxi Lu'an Group as the research object,based on the three-dimensional in-situ stress test and inversion,this paper makes a comprehensive analysis and Discussion on the layout orientation of roadway and the stability of surrounding rock in support design.The main contents are as follows:1.two methods of GPR loose circle test and roof drilling peep are used to test and investigate the loose circle range and the broken condition of roadway roof in this paper;2.the three-dimensional in-situ stress measurement method of hollow inclusion is adopted,and the in-situ stress of two measuring points in Wangzhuang mine is measured and analyzed with tx-120 hollow inclusion strain gauge,and the magnitude and direction of stress are obtained.The three-dimensional in-situ stress inversion analysis is carried out,and the analysis results are consistent with the actual situation of the mine;3.through the analysis of generalized plane theory,the changing rule of the relationship between the displacement and the diameter of roadway is obtained;4.by means of numerical simulation,three angles of 0 °,45 °,90 ° are selected to study the influence of different stress angles on the roadway;5.the supporting design and field monitoring of the 8102 working face of Wangzhuang Coal Mine are carried out.The results show that the supporting scheme is reasonable and effective.