Determine Deformation And Stability Disposal For Highway Structures In Mined-out Area Environment

Goaf is a special kind of geotechnical engineering problems under the highwaysubgrade, and it brings special difficulties to highway construction. In the constructionof practical engineering, it cannot avoid across the goaf, and brings the security risksand potential hazards accordingly to roadbed, road surface, tunnels and such as otherstructures.Our country has made a lot of practice and accumulated valuable experience in thestability evaluation of the goaf, construction management technology and the survey ofgoaf.With the rapid development of highway construction in China, to varying degrees,geological hazards problems in recent years influence western Jingfu highway aroundthe city of Xuzhou, Wukui highway, Jinjiao highway, Tanshao highway, Taijiu highwayand so on. In view of the problems people conducted a series of experimental study.Around the main problem of goaf, this paper analyzes the degeneration index andstability of the goaf disposal based on thousands of south highway project.Centering on the stability evaluation of the goaf, this paper conducted thefollowing study:1) The basic characteristics and deformation of the goaf are introduced, the mainfactors influencing the surface movement and deformation of the goaf are analyzed; themainly technology domestic goaf detection system, different methods of stabilityevaluation of the goaf,construction and management technology are introduced.2) Combining the project section of site geological surveying and mapping data,the engineering geological conditions and the detection results are analyzed.3) According to the evaluation of the site stability in different standards,respectively on the projects section analysis, stability of project section based oncomprehensive analysis of the results.4) Application of limit equilibrium analysis evaluation of the site stabilitycoefficient. By calculating the goaf roadway roof stability of the critical depth andactual depth for comparison, evaluation of project link stability.5) Application of probability integral method to evaluate the values of surfacemovement and deformation of goaf, calculated maximum deformation and residualdeformation value, expected future deformation by residual deformation value, conductsthe research to the project section. 6) Numerical simulation method is applied to simulated analysis of the goaf, finiteelement analysis software ANSYS is used to simulation analysis the goaf sections andthe evaluation of treatment effect before and after grouting.7) The paper focuses on grouting filling method in the goaf governance,according to indoor experiment study, selects suitable for grouting materials andgrouting mixture ratio in the project.