High-performance roadway wall back filling layer material taking pretreated phosphogypsum as aggregate

Abstract

The invention belongs to the technical field of roadway wall back filling layers and solid waste recycling, and discloses a high-performance roadway wall back filling layer material with pretreated phosphogypsum as aggregate. According to the ardealite backfill material, ardealite which is pretreated after being dried for 8 hours at the temperature of 130 DEG C is used as aggregate, slag and carbide slag are added, the mixture is stirred with tap water, and no other additive is added. The ardealite, the slag and the carbide slag pretreated by the aggregate used by the wall back filling layer material respectively account for 65-75%, 20-25% and 5-10% of the total solid mass. The ardealite wall back filling layer manufactured according to the mixing ratio can meet the compressive strength requirement, the fluidity requirement and the water permeability requirement of the wall back filling layer in a roadway composite support system, and has the advantages of being low in cost and easy and convenient to manufacture. Meanwhile, the problem that a large amount of industrial solid wastes such as ardealite and the like are accumulated is solved, land resource pressure is released, contribution is made to environmental protection, and certain practical significance is achieved.

Description

technical field [0001] The invention relates to the technical field of roadway composite wall backfill and recycling of industrial solid waste, in particular to a high-performance roadway wall backfill material with pretreated phosphogypsum as aggregate. Background technique [0002] With the increasing social productivity in our country, the construction of infrastructure has ushered in vigorous development, especially the scale and quantity of underground projects are increasing day by day. At the same time, my country is rich in mineral resources. In order to meet the needs of social production, in the process of massive mining of mineral resources, the safety of the structure of the mine transportation roadway and the mining roadway for people to walk is very important. In the process of excavation and mining, the roadway surrounding rock is susceptible to the influence of "three highs and one disturbance", and the surrounding rock has suffered from large deformation, ro...

AI Technical Summary

Problems solved by technology

However, due to the strong water absorption of hemihydrate phosphogypsum, it will absorb moisture in the environment when stored under normal temperature and pressure conditions, and become dihydrate phosphogypsum in a short period of time. The storage and transportation conditions are relatively complicated.

If the filling layer behind the wall is filled with hemihydrate phosphogypsum, the cost of storage and transportation cannot be reduced, which will increase the support cost in the actual roadway support, and at the same time, the strength of the filling layer material cannot be accurately controlled. Bring unstable factors to roadway support

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