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Construction method for forming waterproof grouting curtain on water-rich pore rock stratum by blasting

A technology of grouting curtain and construction method, which is applied in earthwork drilling, surveying, wellbore lining, etc., and can solve the problems of complex construction technology, long construction period, and high project cost

Pending Publication Date: 2020-10-30
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the depth of the wellbore increases, the thickness of the well wall is too large, the project cost is extremely high, the construction period becomes longer, and the construction process is complicated

Method used

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  • Construction method for forming waterproof grouting curtain on water-rich pore rock stratum by blasting
  • Construction method for forming waterproof grouting curtain on water-rich pore rock stratum by blasting
  • Construction method for forming waterproof grouting curtain on water-rich pore rock stratum by blasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, a construction method utilizing blasting to form a water-proof grouting curtain in a water-rich porous rock formation comprises the following steps:

[0034] Step 1: If figure 2 As shown, taking the center of wellbore 1 as the center of the circle, a circle of blasting boreholes 2 is constructed on the periphery of the planned wellbore 1, and the distance between adjacent blasting boreholes 2 is 1.2m. Drilling rigs are used to drill vertically from the ground down until Through the water-rich porous rock formation 5 to reach the impermeable formation 6, the two sides of each blasting borehole 2 are respectively provided with grooves with a depth not greater than 10 cm through high-pressure water jets, and the grooves can form cracks between the blasting boreholes 2 Drill a pumping inspection hole 3 near the center of the well shaft to be constructed, and use a drilling rig to drill vertically from the ground until reaching the impermeable fo...

Embodiment 2

[0041] Such as Figure 4 As shown, a construction method utilizing blasting to form a water-proof grouting curtain in a water-rich porous rock formation comprises the following steps:

[0042] Step 1: If Figure 5 As shown, taking the center of wellbore 1 as the center, two circles of blasting boreholes 2 are constructed on the periphery of the planned wellbore. The distance between adjacent blasting boreholes 2 is 1.5m, and the distance between the first circle and the second circle is Drilling rigs are used to drill vertically from the ground downwards. The first round of blasting holes 2 passes through the first layer of water-rich porous rock layer 5 to the first layer of impermeable stratum 6. The second round of blasting holes 2 passes through the first layer of One layer of water-rich porous rock formation 5 and the second layer of water-rich porous rock formation 5 reach the second layer of impermeable formation 6, and the two sides of each blasting hole 2 are respect...

Embodiment 3

[0049] In addition to the above two embodiments, the water-proof grouting curtain construction method of the present invention is also applicable to other areas that require water-proof construction, such as tunnel excavation, coal mining and other fields. The drilling arrangement can be linear according to needs, such as Figure 6 shown. All the other construction steps are with embodiment 1.

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Abstract

The invention relates to a construction method for forming a waterproof grouting curtain on a water-rich pore rock stratum by blasting. The method comprises the steps of constructing a plurality of blasting drilling holes in the periphery of a shaft until reaching a water-tight stratum, and drilling a water pumping inspection hole in the center of the shaft until reaching the water-tight stratum;lowering a seamless steel pipe into each blasting drilling hole; placing a plastic pipe filled with a water-resistant explosive and a detonator into each blasting drilling hole in sequence, initiatingthe explosives through detonating pipes, and pulling and cracking the water-rich pore rock stratum between the drilling holes through blasting to form a circle of through grouting cracks or crushingthe rock stratum to form a good grout penetration channel; perforating and grouting the blasted drilling holes; before and after grouting, pumping water to check changes of the water inflow of the shaft; and after the complete waterproof grouting curtain is formed, excavating the shaft. According to the construction method, the through cracks or the good grout penetration channel is formed by drilling hole blasting, the water-proof curtain is formed by grouting, and a channel for seepage of water at the pore rock stratum section into the shaft is cut off, so that the purpose of shaft construction under the condition of no water or a small amount of water is achieved.

Description

technical field [0001] The invention relates to the technical field of mine engineering construction, in particular to a construction method for forming a water-proof grouting curtain in a water-rich porous rock layer by blasting. Background technique [0002] In many areas, mineral resources are buried in deep strata passing through water-rich rock formations. These rock formations are mostly Cretaceous, Jurassic and other rock formations. There are many aquifers and formation water mostly exists in the form of pore water. When the fissures in the rock formation are well developed and the water inflow from the fissures is large, the grouting method is generally used to seal the fissure water, and then the wellbore is constructed by the ordinary sinking construction method. However, when the formation water exists in the form of pore water, a large number of engineering examples prove that using ground pre-grouting or working face pre-grouting method for water plugging often...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D11/10E21D11/38E21D9/00E21D9/10E21B47/00
CPCE21D11/105E21D11/38E21D9/006E21D9/10E21B47/00
Inventor 任彦龙杨维好李海鹏黄家会杨志江
Owner CHINA UNIV OF MINING & TECH
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