The Study On The Influence Of Surface Subsidence In Coal Mining On The Construction Of High Speed Railway In South Shandong Provience

In recent years,the development of high-speed railway in China has been developing rapidly.High speed rail construction has high requirements for surface stability.However,under some special circumstances,the high-speed rail has to go through the coal mining area.The long history of coal mining in China,the large change in the thickness of coal seam,the changeable geological environment and the different ways of mining and backfilling make the range and settlement change of the goaf difficult to be preset and evaluate.In addition to the high speed rail project,the increasingly tense land resources,part of the project and project also need to mine the goaf.It is particularly important to judge the safety and stability of construction in the mined out area.Through the analysis and calculation of the non retention of high iron protection in Lunan,it is found that the maximum boundary distance between the East Wing mining pillar line and the proposed South high iron enclosure is 259.09m.Through the E3112 working face,the goaf in the E3112 working face may have a certain influence on the construction of the South high speed iron in the south of the mining area;the boundary angle of the downhill direction of the E2604 working face in the west side is 58°.The boundary distance between the protected coal pillar and the proposed South high iron enclosure is 213.27m,and the nearest distance between the boundary of the E2604 working face is 0.63m,and the mined area of the E2604 working face will not affect the construction of the South high speed iron.It is found that the goaf of the E3112,E3402,E3403 and E2604 faces is a horizontal to slowly inclined goaf based on the study of the failure process and the deformation zone of the overlying strata in the study area.The surface movement basin of the surface is roughly symmetrical to the plane position of the goaf,and the distribution of the surface movement and deformation is roughly symmetrical with the center of the goaf.The bedding of the overlying bedrock is more developed and has a certain effect on the deformation.The pore water and bedrock fissure water have little effect on the working face of the working area.Through the calculation of the influence of mining face of E3402 face,E3403 working face and corner block of mining area,it is known that the excavation of the retaining belt is more deformed.Due to the high standard of high speed railway for horizontal displacement and settlement,the horizontal displacement and surface settlement in the enclosure will have a certain influence on the stability of the high speed railway line in South Shandong.The old goaf is not affected,and the corner load does not relate to the water flowing fractured zone.It will provide a reference for similar work in the future.