Grouting reinforcement treatment method for mid-depth goaf below building foundation

Abstract

The invention provides a grouting reinforcement treatment method for a mid-depth goaf below a building foundation. The method mainly includes the steps that the grouting boundary range is determined through calculation, the grouting drilling depth is determined through a water injection test, grouting drilling, a grouting pump, a grouting rod and a hole packer are involved, the grouting boundary range is determined through theoretical calculation and the water injection test, grouting parameters and the grouting process are designed, and grouting reinforcement effect quality detection and settlement monitoring are conducted. The building foundation treatment method suitable for the coal mine goaf is provided. The method is characterized in that the grouting range is determined through theoretical calculation by looking up exploration and geographical data; the grouting drilling depth is determined through the water injection test; the corresponding grouting parameters are designed, grouting equipment is selected, and the grouting process is determined; drilling coring is conducted after one month after grouting construction, and grouting quality detection and surface deformation monitoring are conducted. The method has the beneficial effects that the damaged rock stratum and loosened rock of the coal mine goaf on the lower portion of a building are reinforced, residual displacement and deformation of overlaying rock on the upper portion of the goaf are effectively controlled, and normal use of the building is guaranteed.

Description

technical field [0001] The invention belongs to a method for controlling geological disasters in mines, and is applicable to goafs in coal mines with a buried depth of more than 30m under building foundations that need to be reinforced. Background technique [0002] After underground mineral resources are mined, there are mainly filling methods, pillar support methods, and roof caving methods for the formed goaf. In order to fully recover resources, the filling method is often used to deal with goafs in the mining of precious or rare metal mineral resources, but the higher the strength of the filling body, the higher the filling cost, even if the filling method is used to mine precious or rare metal mineral resources , the surrounding rock of the filling body is still deformed and damaged; pillars are left in the goaf to support the damage of the roof rock mass, but with mining disturbances, groundwater or rock rheology, the strength of the pillars will be reduced or even de...

AI Technical Summary

Problems solved by technology

In order to fully recover resources, the filling method is often used to deal with goafs in the mining of precious or rare metal mineral resources, but the higher the strength of the filling body, the higher the filling cost, even if the filling method is used to mine precious or rare metal mineral resources , the surrounding rock of the filling body is still deformed and damaged; pillars are left in the goaf to support the damage of the roof rock mass, but with mining disturbances, groundwater or rock rheology, the strength of the pillars will be reduced or even destroyed; the roof will collapse The method is more common in coal mining to deal with gobs, that is, after the mining of coal resources, the roof stratum collapses to form "three zones": the caving zone, the fissure zone and the bending subsidence zone. Under the comprehensive influence of various factors such as landforms and topography, rock formations and ground surfaces move, resulting in a series of geotechnical engineering problems such as road cracks and sinking, house collapses, etc.

[0003] At present, there are two main aspects to deal with goafs: one is to use green mining theory to guide production, that is, to deal with goafs in the process of mining design and generation, but due to mining costs, understanding of green mining theory, and environmental concepts and other reasons, the theory cannot be effectively promoted

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