CN111764959A - Gas-liquid linkage high-concentration slurry grouting device and method for deep water-rich goaf - Google Patents

Abstract

The invention relates to a slurry grouting device and method, belongs to the field of goaf treatment, and particularly relates to a deep water-rich goaf gas-liquid linkage high-concentration slurry grouting device and method. The method comprises the following steps: the gas-liquid linkage grouting sealing sleeve, the high-concentration slurry pipe and the gas pressure pipe; one end of the high-concentration slurry pipe and one end of the gas-liquid pressure pipe are connected with the gas-liquid linkage grouting sealing sleeve, and the other ends of the high-concentration slurry pipe and the gas-liquid linkage grouting sealing sleeve are respectively connected with a grouting pump and a gas-liquid pump; and a grouting pressure sensor is arranged at the lower end of the high-concentration slurry pipe. According to the device and the method, the slurry filling pumping system and the gas pressure system are arranged in the grouting hole at the same time, and the deep water-rich goaf is subjected to grouting filling by using the gas-liquid linkage grouting device, so that the aims of effectively preventing the grouting hole and the pipeline from being blocked and controlling the accumulation range and the form of high-concentration slurry are fulfilled.

Description

Gas-liquid linkage high-concentration slurry grouting device and method for deep water-rich goaf

Technical Field

The invention relates to a slurry grouting device and method, belongs to the field of goaf treatment, and particularly relates to a deep water-rich goaf gas-liquid linkage high-concentration slurry grouting device and method.

Background

With the rapid advance of the processes of urbanization, industrialization and modernization, the overlying land of the coal mine goaf needs to be activated, and the goaf needs to be filled and managed urgently. The method for carrying out full-filling grouting by using low-concentration grout is a common method for the current goaf treatment, has the advantages of simple and convenient construction, capability of fundamentally treating, wide application range and the like, but has lower full-filling grout concentration, serious segregation when meeting water, poor full-filling effect on the water-rich large-cavity goaf grout, large grouting grout consumption and uncontrollable grouting range. In order to prevent slurry segregation, the prior art adopts a chemical slurry grouting mode to quickly form a stone body in a goaf, but the method has higher cost, uncontrollable slurry flowing range and easy pollution to underground water. In the prior art, high-concentration grout is also adopted to fill the goaf, although the filling effect of the high-concentration grout on the goaf is better than that of low-concentration grout, the grouting amount and the range are controllable, but if the goaf is deeper than the goaf in the grouting process, a grouting pipeline is too long, the grout is easy to have the problem of hole blocking or pipe blocking caused by separation (segregation) of coarse aggregate and fine aggregate when meeting water in a grouting hole or a vertical grouting pipe (figure 1), and meanwhile, after a high-concentration grout accumulation body is connected with a top plate of the goaf, the problems that the grouting pressure is insufficient or the pressure cannot be transmitted to grout in a drill hole by a grouting pump, the grout accumulation body stops diffusing, the grout is accumulated in the drill hole, and the high-concentration grout cannot diffuse to a designed position and accumulate in a form are caused.

Aiming at the problem of grouting reinforcement of a high-pressure water-rich goaf, one of the prior art is that a goaf top plate falls off in a blasting mode by drilling holes around the goaf, annular-range high-strength pressure grouting formed by the drilling holes of the goaf is used for forming a curtain reinforcement body, then grouting is carried out by using a common grouting mode, and meanwhile, water is drained. Although the process solves the problem of filling the water-rich goaf, the process is complex, the process also has a blasting procedure, and if a working face exists around the process, dynamic pressure or other derivative disasters can be caused, so that the safety production of the tunneling working face is threatened.

Therefore, in order to solve the problems, a safe and reliable high-concentration slurry filling method for a deep water-rich goaf with simple construction is needed.

Disclosure of Invention

The following presents a simplified summary of one or more aspects in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated aspects, and is intended to neither identify key or critical elements of all aspects nor delineate the scope of any or all aspects. Its sole purpose is to present some concepts of one or more aspects in a simplified form as a prelude to the more detailed description that is presented later.

The invention mainly aims to solve the technical problems in the prior art and provides a gas-liquid linkage high-concentration slurry grouting device and method for a deep water-rich goaf. According to the device and the method, the slurry filling pumping system and the gas pressure system are arranged in the grouting hole at the same time, and the deep water-rich goaf is subjected to grouting filling by using the gas-liquid linkage grouting device, so that the aims of effectively preventing the grouting hole and the pipeline from being blocked and controlling the accumulation range and the form of high-concentration slurry are fulfilled.

In order to solve the problems, the scheme of the invention is as follows:

a goaf gas-liquid linkage grouting device comprises: the gas-liquid linkage grouting sealing sleeve, the high-concentration slurry pipe and the gas pressure pipe;

one end of the high-concentration slurry pipe and one end of the gas-liquid pressure pipe are connected with the gas-liquid linkage grouting sealing sleeve, and the other ends of the high-concentration slurry pipe and the gas-liquid linkage grouting sealing sleeve are respectively connected with a grouting pump and a gas-liquid pump;

and a grouting pressure sensor is arranged at the lower end of the high-concentration slurry pipe.

Preferably, the goaf gas-liquid linkage grouting device is characterized in that the bottom end of the gas-liquid linkage grouting sealing sleeve is connected with a slurry blocking device, the slurry blocking device comprises a slurry blocking ring, the slurry blocking ring is funnel-shaped, one end of the slurry blocking ring with a smaller opening is connected to one sleeve, and the other end of the slurry blocking ring can turn over along a direction parallel to the sleeve when the stress reaches a threshold value.

Preferably, the slurry blocking device is connected with the gas-liquid linkage grouting sealing sleeve through a reverse spiral connector.

A goaf gas-liquid linkage grouting method comprises the following steps: and a slurry blocking device is arranged below the gas-liquid linkage grouting sealing sleeve and comprises a slurry blocking ring, a high-concentration slurry pipe is lowered below the designed slurry liquid level to start grouting, and the slurry is prevented from reversely flowing by the slurry blocking ring.

Preferably, in the above method for gas-liquid linkage grouting of a gob, the grouting blocking ring is funnel-shaped, and the end with the smaller opening is connected to a casing, and when the grouting sealing casing is grouted by the downward discharged gas-liquid linkage, the grouting blocking ring is lowered to a specified position along the stubble, and then the gas-liquid linkage grouting sealing casing is lifted up to enable the grouting blocking ring to rotate reversely and be locked in the wall of the drilled hole.

Preferably, in the goaf gas-liquid linkage grouting method, the lower part of the gas-liquid linkage grouting sealing sleeve is connected with the slurry blocking device through a reverse spiral joint; when the grouting pressure rises to a specified threshold value, the gas-liquid linkage grouting sealing sleeve is rotated anticlockwise so as to be separated from the grout blocking device.

A goaf gas-liquid linkage grouting method comprises the following steps: and a high-concentration slurry pipe and a pneumatic pipe are arranged in the gas-liquid linkage grouting sealing sleeve, the high-concentration slurry pipe is lowered to be below the designed slurry liquid level, a grouting pump and a pneumatic pump are opened for grouting filling, and in the stable grouting stage, the pressure of the pneumatic pump is adjusted by measuring the pressure through a pressure sensor so as to keep the slurry liquid level position.

Preferably, in the above goaf gas-liquid linkage grouting method, the pressure P of the air pressure pump is adjusted according to the following formula:

in the formula, z₁-z₂Head difference, gamma is the water gravity, D₀Is equivalent pipe diameter, ρ_mThe concentration of high-concentration slurry, v the flow rate of the slurry, lambda the resistance coefficient of fanning and h the height of goaf.

The advantages of the invention over the prior art are therefore:

1) the full-pipe flowing of high-concentration slurry is realized, and the problem of pipe blockage caused by the segregation of the slurry in a grouting pipe or a grouting hole is effectively prevented;

2) through the coordinated operation of the grouting pump and the air pressure pump, the slurry can be effectively controlled to be continuously injected into the goaf, and the continuous pressure transmission and the stable and continuous slurry flow are realized;

3) the slurry blocking device arranged at the lower end of the gas-liquid linkage grouting sealing sleeve can effectively prevent the problem that the pipe is difficult to extract to cause huge economic loss due to the fact that the pressure in a hole is too large and the depth of the hole is too large, and slurry flows to the earth surface along the reverse direction of the grouting pipe to produce strong adsorption effect on the sleeve.

Drawings

The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present invention and, together with the description, further serve to explain the principles of the invention and to enable a person skilled in the pertinent art to make and use the disclosure.

Fig. 1 is a schematic diagram of a conventional high-concentration grouting isolation pipe plugging process in an embodiment of the present invention.

FIG. 2 is a schematic diagram of an inventive apparatus according to an embodiment of the present invention.

Fig. 3 is a schematic view of a reverse spiral joint between a gas-liquid linkage grouting sealing sleeve and a slurry blocking device.

FIG. 4 is a schematic view of a slurry blocking apparatus.

FIG. 5 is a schematic view of the gas-liquid linkage grouting sealing sleeve.

FIG. 6 is a schematic view of lifting the pneumatic-hydraulic linkage grouting sealing sleeve to make the angle of the grout isolation ring reverse.

FIG. 7 is a schematic view of slurry blocking of the slurry blocking ring.

Wherein, 1 high-concentration slurry, 2 water, 3 coarse aggregate, 4 fine aggregate, 5 grouting holes, 6 gas-liquid linkage grouting sealing sleeves, 7 high-concentration slurry pipes, 8 air pressure pipes, 9 check valves, 10 grouting pumps, 11 air pressure pumps, 12 stratums, 13 high-concentration filling accumulation bodies, 14 grouting pressure sensors, 15 liquid level meters, 16 goaf bottom plates, 1-1 reverse spiral connectors, 1-2 slurry isolating rings and 1-3 drill hole walls.

Embodiments of the present invention will be described with reference to the accompanying drawings.

Detailed Description

Examples

The embodiment provides a high-concentration slurry filling device for a deep water-rich goaf, as shown in figure 2. The device includes: the device comprises a gas-liquid linkage grouting device 6, a high-concentration slurry pipe 7, a pneumatic pipe 8, a grouting pump 10, a pneumatic pump 11 and a grouting pressure sensor 14. The gas-liquid linkage grouting device is in threaded connection with a grouting hole orifice pipe with the same diameter, a high-concentration slurry pipe hole and an air pressure pipe hole are formed in the top of the device, a high-concentration slurry pipe penetrates through the high-concentration slurry pipe hole, the high-concentration slurry pipe is welded with the high-concentration slurry pipe hole, the ground is connected with a grouting pump, a check valve is arranged in the middle of the device, the grouting hole is formed in the position 1-2m below the designed slurry level (horizon), a grouting pressure sensor is arranged at the tail end of the inner wall of the high-concentration slurry pipe, real-time pressure is measured, a liquid level meter is arranged on the outer wall of the high-concentration slurry pipe 1-2m away; the pneumatic tube penetrates through the pneumatic tube hole, the pneumatic tube is welded with the pneumatic tube hole, the ground is connected with the pneumatic pump, the check valve is arranged in the middle of the pneumatic tube hole, and the grouting hole is arranged 1-2m below the pneumatic tube hole.

In the embodiment, the bottom end of the gas-liquid linkage grouting sealing sleeve 6 is connected with a slurry blocking device, and the slurry blocking device consists of a reverse spiral joint and a slurry isolating ring; the slurry isolating ring is made of a composite material of rubber and carbon black, and the edge of the slurry isolating ring is slightly roughened, so that the slurry isolating ring is better in occlusion degree with the stratum; the slurry blocking ring is in a funnel shape, one end with a smaller opening of the slurry blocking ring is connected to a sleeve, and the other end of the slurry blocking ring can turn in a direction parallel to the sleeve when the stress reaches a threshold value, so that a structure similar to a one-way valve is formed after the slurry blocking ring is meshed with the stratum.

As shown in fig. 3, a slurry blocking device is arranged at the lower end of the gas-liquid linkage grouting sealing sleeve; the slurry blocking device consists of a reverse spiral connector 1-1 and a slurry isolating ring 1-2;

the slurry isolating ring is made of a composite material of rubber and carbon black, and the edge of the slurry isolating ring is slightly roughened, so that the slurry isolating ring is better in occlusion degree with the stratum;

the embodiment also provides a deep water-rich goaf high-concentration slurry filling method, which comprises the following steps:

1. drilling a designed position of the goaf by using a drilling machine, initially performing slurry wall protection to prevent accidents of pipe burying and pipe blocking of a deep grouting pipe caused by hole collapse, installing an orifice pipe, and ensuring the pipe to be compact and the length of the orifice pipe to be determined according to designed grouting pressure;

2. the high-concentration slurry pipe is lowered to be 1-2m below the designed slurry liquid level, the diameter of the high-concentration slurry pipe is designed according to the grouting amount and is not less than 6cm, the effective work of a grouting pressure sensor is kept, and a gas-liquid linkage grouting device is in threaded connection with the orifice pipe;

3. the designed slurry surface position of the grouting is 5-10m above the roof caving zone, so that the grouting can be ensured to be injected into all cavities or gaps;

4. a slurry blocking device is arranged at the lower end of the gas-liquid linkage grouting sealing sleeve;

when the gas-liquid linkage grouting sealing sleeve is placed, the grouting ring is closed tightly, the initial design form and angle of the grouting ring are utilized, the grouting ring can be placed to a specified position in a sequential manner, when the gas-liquid linkage grouting sealing sleeve is placed at a prepared position below the gas-liquid linkage grouting sealing sleeve, the gas-liquid linkage grouting sealing sleeve is lifted upwards by proper force, the angle of the grouting ring is reversed, and the grouting ring is locked in the wall of a drill hole, so that grout is prevented from reversely remaining outside the gas-liquid linkage grouting sealing sleeve and between stratums, and the gas-liquid linkage grouting sealing sleeve is prevented from being buried in a pipe;

when high-concentration grout is injected, when the grouting pressure is suddenly increased and the grout blocking effect of the grout blocking ring is not obvious, the grout blocking ring cannot prevent the grout from flowing between the outer pipe wall and the wall (stratum) of a drilled hole, so that the grouting pressure is suddenly overlarge, pipe blocking occurs, the whole device is difficult to pull out, at the moment, grouting needs to be stopped immediately, and the whole device is pulled out from the hole by using the reverse spiral connector. The gas-liquid linkage grouting sealing sleeve is rotated anticlockwise, the gas-liquid linkage grouting sealing sleeve is separated from the slurry blocking device by using the reverse spiral connector, the gas-liquid linkage grouting sealing sleeve is lifted, and the gas-liquid linkage grouting sealing sleeve can be prevented from being pulled out of a grouting hole.

5. And simultaneously opening a high-concentration slurry grouting pump and a gas pressure pump to perform grouting filling, and when high-concentration slurry rises to the designed liquid level (layer) in the drill hole and the high-concentration slurry pipe is fully filled, performing stable grouting. The pressure of a grouting pump and the pressure of a gas pump are automatically coordinated through a pressure sensor, the liquid level position of slurry is kept, full pipe flowing of the slurry in a high-concentration slurry pipe is realized, and the slurry injected into a drill hole can continuously move to a goaf under the action of air pressure, so that continuous grouting is guaranteed without segregation at any position.

In this embodiment, the sensor control coordination relationship is calculated by the following formula.

During grouting, the air pressure needs to be controlled to be balanced with the pressure required by slurry filling expansion, so that the formula (1) is provided, namely

P＝P₀+P₁(1)

Wherein, P₀For pressure of ground water

P₀＝(z₁-z₂)γ (2)

Wherein z is₁-z₂Is the head difference and gamma is the water gravity.

P₁Pressure expansion for slurries

Wherein L is the top diffusion radius of the high-concentration slurry, rho_mAt high concentration of the slurry, v is the flow rate of the slurry, D₀Is equivalent pipe diameter, takes the value within the range of 0.01-0.08 m, lambda is the fanning resistance coefficient, and is determined according to the comprehensive Reynolds number,

integrated reynolds number Re_cDepending on the effective viscosity of the slurry.

The top diffusion radius L of the high-concentration slurry is determined according to the volume of a grouting accumulation body

Wherein V is grouting amount, h is goaf height, and a is slurry stacking angle.

The grouting amount is calculated according to the flow rate,

V＝Qt (5)

wherein Q is grouting flow, and t is grouting time.

The slurry roof contact radius can be known through the grouting flow and the grouting time:

the slurry level is made to be at a fixed position, and the grouting pressure is gradually adjusted with time according to the formula (7) as the grouting continues.

As can be seen from the above description, in the present embodiment, through the coordination operation of the grouting pump and the air pressure pump, the slurry can be effectively controlled to be continuously injected into the goaf, and the continuous pressure transfer and the stable and continuous slurry flow are realized. The embodiment can realize full-pipe flow of high-concentration slurry, and effectively prevent the problem of pipe blockage caused by separation of the slurry in a grouting pipe or a grouting hole; and, the thick liquid device that hinders that this embodiment gas-liquid linkage slip casting seal sleeve pipe lower extreme set up can effectively prevent because downthehole pressure is too big, and the hole depth is too big, and thick liquid leads to the pipe to be difficult to extract the problem that causes huge economic loss along slip casting pipe reverse flow to the earth's surface to the strong adsorption of sleeve pipe production.

In this embodiment, while, for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more embodiments, occur in different orders and/or concurrently with other acts from that shown and described herein or not shown and described herein, as may be understood by those of ordinary skill in the art.

It is noted that references in the specification to "one embodiment," "an example embodiment," "some embodiments," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to effect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

The previous description of the disclosure is provided to enable any person skilled in the art to make or use the disclosure. Various modifications to the disclosure will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other variations without departing from the spirit or scope of the disclosure. Thus, the disclosure is not intended to be limited to the examples and designs described herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (8)

1. The utility model provides a collecting space area gas-liquid linkage slip casting device which characterized in that includes: a gas-liquid linkage grouting sealing sleeve (6), a high-concentration slurry pipe (7) and a gas pressure pipe (8);

one end of the high-concentration slurry pipe (7) and one end of the air pressure pipe (8) are connected with the air-liquid linkage grouting sealing sleeve (6), and the other ends are respectively connected with a grouting pump (10) and an air pressure pump (11);

and a grouting pressure sensor (14) is arranged at the lower end of the high-concentration slurry pipe (7).

2. The goaf gas-liquid linkage grouting device according to claim 1, characterized in that the bottom end of the gas-liquid linkage grouting sealing sleeve (6) is connected with a grouting blocking device, the grouting blocking device comprises a grouting blocking ring, the grouting blocking ring is funnel-shaped, one end with a smaller opening is connected to one sleeve, and the other end can turn over in a direction parallel to the sleeve when the stress reaches a threshold value.

3. The goaf gas-liquid linkage grouting device according to claim 2, characterized in that the grouting blocking device is connected with a gas-liquid linkage grouting sealing sleeve (6) through a reverse spiral connector (1-2).

4. A goaf gas-liquid linkage grouting method is characterized by comprising the following steps: and a slurry blocking device is arranged below the gas-liquid linkage grouting sealing sleeve (6), and comprises a slurry blocking ring, a high-concentration slurry pipe (7) is lowered below the designed slurry liquid level to start grouting, and the slurry is prevented from reversely flowing by the slurry blocking ring.

5. A goaf gas-liquid linkage grouting method as claimed in claim 4, characterized in that the said grouting-resistant ring is a funnel shape, the end with smaller opening is connected to a casing, when the grouting-resistant sealing casing (6) is downward deflated and liquid linkage grouting is performed, the grouting-resistant sealing casing (6) is lifted up to make the grouting-resistant ring reverse and lock in the borehole wall after the grouting-resistant ring is downward stubbled to the designated position.

6. The goaf gas-liquid linkage grouting method according to claim 4, characterized in that a reverse spiral joint is adopted for connection between the lower part of the gas-liquid linkage grouting sealing sleeve (6) and the slurry blocking device; when the grouting pressure rises to a designated threshold value, the gas-liquid linkage grouting sealing sleeve (6) is rotated anticlockwise so as to be separated from the grout blocking device.

7. A goaf gas-liquid linkage grouting method is characterized by comprising the following steps: set up high concentration thick liquid pipe (7), pneumatic tube (8) in gas-liquid linkage slip casting seal tube (6), transfer high concentration thick liquid pipe (7) to below the design thick liquid level, open grouting pump and pneumatic pump simultaneously and carry out the slip casting and fill, in stable slip casting stage, measure pressure regulation pneumatic pump pressure through pressure sensor in order to keep thick liquid level position.

8. The goaf gas-liquid linkage grouting method according to claim 7, characterized in that the air pressure pump pressure P is regulated according to the following formula:

in the formula, z₁-z₂Head difference, gamma is the water gravity, D₀Is equivalent pipe diameter, ρ_mThe concentration of high-concentration slurry, v the flow rate of the slurry, lambda the resistance coefficient of fanning and h the height of goaf.

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