Research On The Deformation Law And Supporting Of Roadway Surrounding Rock Under Non-uniform Stress Field

As mining engineering develops to deep, all kinds of complex geological structure factors influence the roadway. The destruction and deformation of the roadway are more and more serious. In order to maintain the stability of roadway, ensure the service life of roadway. It will be in-deep study of the roadway deformation failure and the supporting scheme of further research under complicated conditions. Based on the theoretical analysis, numerical simulation and the engineering practice, it analysed deformation and failure of roadway under the non-uniform stress field,then established structure symmetry and Non-uniform stress field model, based on the simplified the stress and the strain of the mechanical model, it taken the Mohr-Coulomb failure criteria and deduced the analytical solution that the stress field of roadway, the strain field and displacement field and the plastic zone of the radius under the Non-uniform stress field, it provided a theoretical solution that the elastic-plastic stress and displacement. Through the calculated the plastic area of the range of analysis, we got the result that as the horizontal stress increases gradually, the plastic zone of roadway range from ribs to top floor. It based on the deformation of the roadway, analysed the mechanics properties bolt-concrete support, combined roadway and supporting structure relationship. It provided a good theory to explain the parameter selection of supporting. In the numerical simulation, it considered different depths and different side pressure coefficients, different softening modulus and supporting force to analyse the influence factors of the surrounding rock of plastic zone distribution. Compared with the theory, it got a very good confirm. Through the theoretical analysis and numerical simulation, it gave the surrounding rock stress field and displacement field distribution rule. Then researched the supporting of LuLing coal mineâ…¢1section crosscut, it put forward control method of roadway and designed the supporting scheme of field test. The result shows that support scheme was effective control of roadway stability. It verified the feasibility of support scheme and laid solid foundation for mine safety production. At the same time, it also gave non-uniform stress field of surrounding rock mass offering an effective solution, brought a certain reference value.