Study On Surface Deformation Mechanism And Risk Assessment Of Goaf In Tangshan Coal Mine

With China 's urbanization continue to advance,Land resources are becoming increasingly tense,Many infrastructure will involve mined out area,Due to the instability of the mined area,Mined areas bring risks to the construction,So to ensure the safety of the upper part of the mining area,the damage to the landmark building is prevented by the great deformation of the area,It is of great significance to study the effective utilization and construction planning of land in China's mining area after studying the characteristics of surface deformation and displacement.The study on ground displacement and deformation in this paper combines the investigation and evaluation of the gob collapse of Tangshan urban planning area,Based on the analysis of comprehensive survey data in this area,the basic engineering geological conditions in the study area are determined,and the distribution characteristics,scale and physical and mechanical properties of the main goaf in the study area are obtained.The characteristics of surface deformation and displacement of goaf under different mining conditions were simulated by means of FLAC3D simulation software,and the influence of various factors on surface deformation was summarized;Then,the numerical simulation of typical mined-out area in the study area was carried out by using FLAC3D simulation software to analyze the deformation of the surface deformation and the stress variation characteristics of each rock formation after coal mining;Then,based on the probabilistic integral surface deformation prediction method,the surface deformation of the goaf is predicted,and the numerical results are compared with the calculation results of the probability integral method to determine the credibility of the mathematical calculation.Finally,according to the classification standard,To carry out the risk of zoning,in order to carry out future work in the region to provide information guidance.The main result are as follows:The characteristics of the three-zone distribution and horizontal and inclined coal seam subsidence basins in the mined out area are analyzed and analyzed;With the aid of FLAC3D simulation software,the mechanism of surface deformation under different mining conditions was analyzed,and the influencing factors;Through the finishing survey area comprehensive survey data,determining the distribution characteristics of mined area,With FLAC3D simulation,the vertical and horizontal displacement laws and internal stress distribution of each stratum are obtained.The results show that the difference between the two is small,and the risk of the whole area is divided according to the division criterion.The results show that the difference between the two is the same as that of the same area by numerical simulation and probability integral.