Method for evaluating stability of newly built railway foundation on goaf

Abstract

The invention belongs to the technical field of coal mining collapse, and in particular relates to a method for evaluating the stability of a newly built railway foundation on a goaf. The method comprises three parts, namely goaf foundation stability analysis, roadbed residual subsidence deformation and mining influence evaluation. Compared with a calculation method recommended in Railway Geological Engineering Manual, the method has the advantages that: the method is more suitable for foundation stability evaluation of different mining methods or mining processes under various geological mining conditions, and the damage characteristic of overlying strata of coal beds and earth surface load influence depth are fully considered; and the method is suitable for foundation stability evaluation of different mining methods or mining processes under different geological mining conditions, is wide in application range and reasonable and reliable in evaluation result, and has good reference significance for foundation stability evaluation of newly built railways in the Lu'an mine district and other mine development goaf. The method has great significance for accelerating the development of the transportation industry of mining areas, solving the problem that the available land of the mining areas is gradually reduced and promoting the sustainable development of the mining area economy.

Description

Technical field: [0001] The invention belongs to the technical field of coal mining subsidence, in particular to an evaluation method for the foundation stability of newly built railways in goafs. Background technique [0002] Lu'an mining area is an important production base of coal resources in my country. In recent years, with the rapid development of coal and related industries, the pressure of transportation in the mining area has become increasingly obvious, which has affected the normal development of enterprises. However, the goaf (moving) area is densely distributed in the mining area, which brings difficulties to the construction of the railway in the mining area and seriously restricts the sustainable development of the mining area economy. [0003] The Lu'an mining area belongs to the Qinshui coalfield, where the 3# thick coal seam of the Permian Shanxi Formation is mainly mined. The overlying strata are composed of sandstone, mudstone, sandy mudstone and Quatern...

AI Technical Summary

Problems solved by technology

According to the general law of surface subsidence and deformation in goafs, it can be known that the subsidence deformation value of goaf surface is not only related to the mining depth and thickness of the coal seam, but also related to the lithology of the coal seam overlying rock, the mining method and the depth of surface load disturbance. Due to the geological and mining conditions, the impact on the surface and railways is very different. Only using the depth-thickness ratio as a measure of the stability of the foundation is difficult to accurately reflect the long-term stability of the foundation, which brings certain problems to the construction and maintenance of new railways.

[0012] Using the calculation formula of the safe mining depth before the present invention does not fully consider the specific geological mining conditions and mining technology and mining methods of the mining area, and the calculation results will inevitably deviate, which will bring hidden dangers or unnecessary errors to the railway construction in the goaf. loss

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