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

A goaf and wellbore technology, applied in wellbore lining, shaft equipment, mining equipment, etc., can solve problems such as limited treatment scope, impact on excavation construction, water inrush from water gushing face, etc., to achieve high construction safety and continuous construction. The effect of shortening performance and high construction safety

Active Publication Date: 2014-06-04
BEIJING CHINA COAL MINE ENG CO LTD
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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 cons

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

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Embodiment Construction

[0031] Such as figure 1 and figure 2 As shown, it is assumed that the net diameter of the proposed wellbore is 8.0m, and there are two goafs in the lower part, and the technical solution of the present invention is described by taking this as an example.

[0032] (1) With the center of the proposed wellbore as the center, two circles of treatment boreholes are arranged on the ground around the proposed wellbore. There are 6 treatment boreholes (1-1~1-6) in the inner circle, and the diameter of the inner circle is 24m; Drill 12 holes (2-1~2-12), the diameter of the outer ring is 50m, set a center hole J, as the final quality inspection hole and supplementary hole. On the same circle: the distance between adjacent treatment boreholes is 15m. Drilling rigs are used to make holes and put down casings. A Φ127-168mm casing is selected for each treatment drilling hole. The bottom of the casing should exceed the depth of the Quaternary system and can ensure repeated hole sweeping; ...

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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 ...

Claims

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Application Information

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IPC IPC(8): E21D5/00
Inventor 冯旭海高晓耕王志晓李生生吴莹刘书杰孙光贺文陈慧肖炜
Owner BEIJING CHINA COAL MINE ENG CO LTD
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