Research On Spatial And Temporal Evolution Of Residual Deformation In Mining Subsidence Area And The Influence Of Ground Buildings

Under the background of ecological civilization construction,efficient utilization of mining subsidence area in mining cities has become one of the hotspots of current research.In the utilization of mining subsidence area,the laws of strata movement and surface displacement is prior to understand,especially the temporal and spatial evolution of residual deformation after stable subsidence and its influence mechanism on ground buildings.Based on the case analysis of field monitoring data,the mechanism of residual deformation in mining subsidence area,interaction between residual deformation and buildings,and the analysis and control of additional internal forces of buildings,caused by residual deformation are studied by using the research methods of similar material test,theoretical research,numerical simulation and field measurement verification.The conclusions are drawn as follows:(1)The residual deformation after mining subsidence includes the continuation of conventional movement deformation and disturbed deformation.Through similar material tests and engineering phenomena,the continuous evolution law of residual deformation after mining subsidence were demonstrated,and the temporal and spatial correlation between residual deformation and strata movement and surface displacement were revealed as well.(2)By summarizing and analyzing the existing research theories and engineering phenomena,the mechanism and influencing factors of residual deformation were analyzed.It is explored that the deformation of the main section of mining subsidence area presents a "Yuanbao curve",and the vertical displacement of residual deformation has a negative exponential correlation with time.(3)Taking the D5 Gate of the World Horticultural Exposition in Tangshan Collapse Area as an example,the residual deformation in the area was predicted by probability integral method according to mining and geological conditions,and the interaction between the residual deformation and the superstructure of the building was studied by numerical simulation method.The superstructure of a building is greatly affected by the residual deformation,so the foundation stiffness and the building stiffness should be increased.(4)The influence of residual deformation of mining subsidence area on foundation and superstructure aws analyzed by numerical simulation and theoretical calculation.The formulas of frame force and lateral displacement of semi-rigid structure are revised considering p-? effect.The internal force and displacement of semi-rigid structure under vertical and horizontal loads are obtained,and the deformation effect of semi-rigid structure under p-? effect is analyzed.The eigenvalue buckling is used to analyze the stability,and the surface deformation characteristics under boundary constraints of fixed,hinged and pinned supports are obtained.(5)According to the structural characteristics of D5 gate of World Expo,the design checking calculation of D5 gate was carried out under the influence of residual deformation,and measures such as increasing structural stiffness and setting rubber bearings are put forward.After completion,the deformation monitoring of the surface,foundation and superstructure of the proj ect area has been carried out.Practice has proved that the measures proposed in this paper can effectively control the influence of residual deformation of mining subsidence area on long-span steel structure.