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Reconstruction method of inter-embedded jet grouting in limestone aquifer

An inter-embedded grouting technology, which is applied in earth square drilling, liquid/gas jet drilling, wellbore/well components, etc., can solve problems such as advanced grouting in shallow coal seams and difficult ground in complex structural areas. Achieve the effects of good grouting transformation effect, low cost and high effective hole section rate

Active Publication Date: 2019-12-31
XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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AI Technical Summary

Problems solved by technology

[0004] The present invention provides a method for realizing grouting reconstruction of limestone aquifer through jet-flow drilling in ordinary drilling, which solves the technical problem that it is difficult to carry out advanced grouting reconstruction on the ground in shallow coal seams and complex structural areas

Method used

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  • Reconstruction method of inter-embedded jet grouting in limestone aquifer
  • Reconstruction method of inter-embedded jet grouting in limestone aquifer
  • Reconstruction method of inter-embedded jet grouting in limestone aquifer

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Embodiment

[0044] Taking a mine in Xingtai, Hebei Province as an example, Austrian ash is an indirect water-filled aquifer mined from the coal seam. The average hydraulic pressure of the Austrian ash on the floor of the coal seam in the area of ​​the first mining area is 2.31MPa, and the average distance between the coal seam and the Austrian ash aquifer is 32.12m. There are many internal faults, and coal seam mining is greatly threatened by Austrian ash water. The inter-embedded jet grouting project is arranged on the ground, and a comprehensive grouting transformation is carried out on the top surface of the bottom plate of the first mining area.

[0045] Step 1: Straight hole section construction. The drilling volume of the first straight hole (D1) is 265.54m. The loose layer is drilled without core, and the bedrock section is drilled with core. The thickness of the alluvial layer is 173.25m, and the final hole enters Austrian ash 16.38m. The diameter of the first hole is Φ245mm, dr...

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Abstract

The invention relates to an inter-embedded jet grouting reconstruction method for limestone aquifers. The method provides a method for realizing grouting reformation of limestone aquifer through jet-flow drilling in ordinary drilling, and solves the technical problem that it is difficult to carry out advanced grouting reformation on the ground in shallow coal seams and complex structural areas. Invented the three-branch hole layout method of a single hole group: one straight hole and three radial jet holes constitute a hole group, the length of the jet holes is 110m, and the included angle of the plane projection of the jet holes is 120°. A process for improving the grouting conditions of the jet holes is proposed, so that the radial jet holes meet the grouting requirements. The distance between the straight holes on the ground is 240m, and the row spacing is 120m. The holes are arranged in a plum blossom shape. The jet holes are divided into A-type holes and B-type holes, arranged at intervals, and the jet holes are nested with each other. The purpose of grouting reconstruction of aquifer.

Description

technical field [0001] The invention relates to a jet grouting reconstruction method, which belongs to the field of mine water disaster prevention and control, and in particular to an interembedded jet grouting reconstruction method for limestone aquifers. Background technique [0002] With the development of coal resources, North China type coalfields have gradually entered the stage of deep and lower group coal mining, and the mining process is increasingly threatened by the Austrian ash water on the floor. Floor grouting reformation is a mature and effective technical measure to prevent and control Austrian limestone water inrush. This technology has gradually developed from local grouting reformation of underground thin-bed limestone to regional ground (underground) limestone grouting reformation. At present, the main modes of ground limestone grouting reconstruction include thin layer limestone directional drilling and grouting modification and thick layer limestone (Au...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B7/18E21B33/13
CPCE21B7/18E21B33/13
Inventor 刘再斌南生辉胡宝玉李凯
Owner XIAN RES INST OF CHINA COAL TECH& ENG GROUP CORP
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