Composite reinforcement slurry for goaf of nitrate mine overlying railway and preparation method thereof

Abstract

The invention relates to the technical field of railway engineering materials, in particular tocompositereinforcement slurry for covering a goaf of a nitrate mine on a railway and a preparation methodof the composite reinforcement slurry. The composite reinforcement slurry for covering the goaf of the nitrate mine on the railway is prepared from the following raw materials in parts by weight: 2 to 5 parts of a water proof agent, 8 to 12 parts ofa water regulator, 3 to 5 parts of a filler material, 0.5 to 1.5 parts of a gelling agent, 12 to 15 parts ofa structural carrier, 3 to 6 parts of a protective agent, 2 to 5 parts of aprotective agent, and 20 to 35 partsofa diluting agent. According to thecomposite reinforcement slurry for covering the goaf of the nitrate mine on the railway,stabledirectional control of rock salt in the nitrate mine is realized through anti-seepage at the top of the goaf, water migration at the bottom, and surrounding rock consolidation, deformation of rock salt overlying rock is reduced, diffusion of brine inside the goafto gaps of rock mass on the upper part is lowered, the water hidden in rock gaps on the side surface of the goaf is absorbed,the rock gaps on the side surface are filled, thus the balance of internal and external pressure of the goaf is improved, the overall strength is improved, the overall performance of the overlying railway structure is significantly improved, and the occurrence ofsettling is reduced.

Description

technical field [0001] The invention relates to the technical field of railway engineering materials, in particular to a composite reinforcement slurry for gobs covered with nitrate mines on railways and a preparation method thereof. Background technique [0002] With the rapid development of my country's railway system and the massive exploitation of mineral resources, it is inevitable that many new railways need to pass through nitrate mines. Rock salt is the main mining product of nitrate mines, a halide with sodium chloride as the main component, and the main source of table salt. Rock salt is easy to deliquescent and soluble in water, and has good rheological properties. After the rock salt is mined, a large goaf will be formed in the area where the rock salt is located. The roof of the goaf will easily cause roof collapse and deformation of the rock due to the pressure of the overlying rock strata. Reflecting the overlying railway structure on the ground, the ground w...

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Problems solved by technology

In addition, the salt wells formed by the excavation of nitrate mines can easily form weak fragmentation zones due to the brine in the salt mines running up, which has a great impact on the safety of railway operations

[0003] In the construction process of railway engineering, if the goaf of nitrate mine cannot be effectively treated, it will directly lead to different degrees of settlement of the construction railway structure, mainly because the rock above the goaf after rock salt mining will lose its support. , breaking the original equilibrium conditions, leading to the destruction and collapse of the overlying rocks, and then causing large-scale ground subsidence, resulting in relatively serious subsidence deformation of the railway structure

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