Simulation Of Subsidence Deformation Law Of Highway Subgrade Over Shallow Coal Seam Subsidence Area

With the increase of subsidence area is increased and the modernization process,both the highway and the newly built highway under the influence of different degree,and at present in shallow seam subsidence above highway the deformation failure mechanism and so on research,not for its failure mechanism put forward the corresponding solution measures,subsidence highway frequent problem such as craze,deformation.To improve the utilization of coal mining subsidence land in our country,increase the stability of subsidence above the highway construction,operation and safety,based on some shallow buried coal mining subsidence geologic conditions for highway roadbed settlement and deformation control research,aimed at our country subsidence of highway construction and governance reasonable theoretical basis and practical application value.Article USES the theory analysis and analog simulation and numerical simulation methods to study the formation mechanism and distribution characteristics of subsidence,analyzes the formation of the subsidence influenced by mining subsidence degree and the distribution characteristics,on the basis of shallow buried coal seam subsided road laid simulation,and the deformation law of destruction of highway subgrade is summarized.Finally,according to the settlement and deformation law of subgrade in subsidence area,the corresponding control measures are put forward,and the feasibility of the control measures is verified by numerical simulation and similar simulation.Based on the formation mechanism of subsidence area and the simulation study of highway load laying above subsidence area,it can be seen that:Different parts sink at highway subgrade deformation failure mechanism is different,subsidence in central stress distribution is "arch" and the value is less than on both sides of the fringes,deformation is given priority to with the vertical settlement and is a more uniform and stable overall settlement,edge area and high level of subgrade deformation degree near the side of the starting cut subgrade was greatly influenced by shear stress easy generation when destroyed.Compared with the vertical settlement and horizontal displacement,the lateral deformation of the embankment is smaller.The deformation is mainly on both sides of the embankment and is symmetrically distributed,and the influence is regionalized and centralized.The outer edge of the embankment is mainly deformed by extrusion,while the inner edge area is prone to bulging deformation from inside to outside.The failure of the middle subgrade is mainly caused by the separation of the subgrade bed,while the failure of the edge subgrade is mainly caused by tensile failure,which is easy to produce the phenomenon of tensile crack.In order to improve the bearing capacity of the subsidence area,the paper set up the security pillar.The numerical simulation study shows that the security pillar can effectively reduce the settlement displacement,horizontal curvature and lateral deformation of the road subgrade in the subsidence area.In addition,for both sink,for improving the security of highway construction and later operation,this paper puts forward grouting filling method,based on analog simulation test study shows subsidence grouting filling can effectively reduce subsidence stability time,reduce the embankment settlement deformation space,effectively increase the subsidence above grade highway construction,the subsidence above roadbed sink reduction has a significant effect.Figure[67]Table[6]Reference[95]...