南官庄煤矿采空区稳定性分析及加固方法研究

Abstract工程硕士学位论文AbstractThis paper takes Gongyi City Nan Guan Zhuang coal mine goaf in Gongyi province(coke copper to high-speed small Zi temple)remodeling project as the research background,through the regional geological conditions along the extension along the highway coal mineand engineering geology background analysis,the slow incline coal layer and the deformationof surrounding rock.Take the experience formula method and GTS numerical simulationmethod of surrounding rock and surface movement and deformation were studied,accordingto the above on the basis of the analysis of coal mine goaf on highway expansion project toand after grouting roadbed stability problems,research mainly draws the followingconclusions:According to the stress nephogram of simulation results can be obtained after coalmining,coal mining at the end of two ends of goaf and coal pillar ends produced moreobvious stress concentration phenomenon,goaf main failure to shear failure;highwayconstruction in long after the additional load,mining coal pillar goaf the regional approachwill become unstable under load,additional settlement,the residual deformation accelerated.Through the goaf treatment principles and standards related to analysis,and advantagesand disadvantages of the goaf treatment general and adapt to the characteristics of thecomprehensive selection,and ultimately determine the grouting method for ultimate controlmeasures,and using GTS numerical simulation method of grouting surrounding rock stressand strain characteristics and effect comparison research cloud,the calculation results showthat the surface deformation before and after injecting the contrast produced very big change,after grouting surface displacement settlement decreases significantly,coal mined out area inafter grouting.In terms of physical and mechanical properties,the physical and mechanicalproperties of surrounding rock after grouting increased,and the stress concentration scope ofcoal mining goaf was significantly reduced,and the surface roadbed deformation decreasedsignificantly.Therefore,after grouting treatment,the bearing capacity and stability of the coalmining goaf are greatly enhanced,and the road defects such as road cracking and unevensettlement can be effectively prevented,so as to ensure the long-term and safe operation ofthe highway engineering and achieve an ideal treatment effect.Key words:Nan Guanzhuang,Freeway,Gob area,Stability,Grouting numericalsimulation.