Comprehensive pretreatment method for shaft penetration in mined-out area stratum

Abstract

The invention discloses a comprehensive pretreatment method for shaft penetration in a mined-out area stratum. The method comprises the steps that (1) treatment drilling holes are formed around the center of a proposed shaft and are formed on the periphery of the proposed shaft; (2) filling materials are conveyed to a mined-out area through the treatment drilling holes on the ground. According to the comprehensive pretreatment method for shaft penetration in the mined-out area stratum, mined-out area dangers during shaft construction can be effectively avoided, the milled-out area is pre-treated before the shaft is excavated, and shaft excavation construction safety and built shaft running safety are ensured.

Description

technical field [0001] The invention relates to the field of coal mine shaft construction safety, in particular to a ground comprehensive pretreatment method for shafts passing through goaf formations. Background technique [0002] With the depletion of shallow coal resources, the extended mining of deep coal resources is increasing, especially in areas where dual-system coalfields exist. Under the background that shallow coalfield resources have been exhausted, underground cavities such as large-scale and various gobs and abandoned roadways have formed, which has become an unavoidable problem in the construction of deep resource mining shafts. Coal mine shaft construction must pass through the above-mentioned mined-out area, which brings great difficulties and hazards to the excavation construction, mainly in the following aspects: [0003] (1) Cavities and unstable rock masses in goafs: Most of the overlying strata in goafs will collapse, fracture and bend over time, and ...

AI Technical Summary

Problems solved by technology

[0003] (1) Cavities and unstable rock masses in goafs: Most of the overlying strata in goafs will collapse, fracture and bend over time, and deformations such as vertical settlement and lateral displacement will occur. The broken zone formed by cavities and caving rocks brings difficulties to shaft excavation and support, shaft wall pouring construction, etc.

[0004] (2) Old kiln water: some water-logged goafs bring difficulties to wellbore construction, and water gushing is very easy to form in the working face

[0005] (3) Toxic and harmful gases: mainly refers to gas, carbon monoxide, carbon dioxide, hydrogen sulfide, etc. accumulated in the goaf. After these gases enter the tunneling face, the gas will inevitably exceed the standard and form a safety hazard, which will affect the tunneling construction.

[0006] (4) After the shaft directly exposes the goaf, the gas in the closed goaf will flow again and oxygen will be introduced, which will easily cause fire, damage mine ventilation, and endanger safety

[0007] (5) Even if the gob area is treated on the working face to ensure that the well wall is poured through, the unstable rock mass in the gob area within a certain range around it still poses a threat to the safety of the well wall, causing deformation or damage to the well wall, and There will be water leakage

[0009] This "post-treatment" method in the excavation process is a passive treatment method. The excavation construction must be interrupted and carried out in a small underground working face, and the scope of treatment is limited. Second and third treatments are still needed

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