Underwater filling and reinforcing boundary control structure and method for water-enriched goaf

Abstract

The application discloses a kind of underwater filling reinforcement boundary control structures and methods of water-rich goaf, solve the slurry outflow problem caused by slurry flow and dispersion factor when treating boundary not easy to control in underwater grouting;Technical scheme includes: curtain grout-stop wall, partition wall and slurry filling area;The curtain grout-stop wall is arranged at the boundary range of goaf treatment, for preventing slurry outflow;The partition wall is arranged in the internal space of curtain grout-stop wall, the partition wall is provided with multiple, adjacent partition wall is set at interval distance;The slurry filling area is surrounded by partition wall and curtain grout-stop wall, and the goaf is divided into several relatively independent slurry filling areas by the curtain grout-stop wall and partition wall.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of geological disaster control, and particularly relates to a water-rich goaf underwater filling and reinforcement boundary control structure and method. BACKGROUND

[0002] The statements in this section merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] After underground mineral resources are mined, specific hollow areas, i.e. goafs, are left underground. The existence of goafs changes the original stress balance state of the underground, leading to problems such as roof collapse and ground subsidence, so we need to carry out goaf control. In the goaf control work, we often face the situation of a wide hollow area and a large amount of water. Such goafs usually have characteristics such as a large range, a deep depth, and complex geological conditions. When using traditional grouting reinforcement technology to control them, the space outside the goaf control boundary is relatively open, and it is difficult to accurately control the flow of the slurry, which can easily cause a large amount of slurry to overflow to the non-control area. In addition, when controlling underwater, the slurry is easy to disperse and difficult to coagulate in water. These problems not only significantly increase the cost of goaf control, causing a large amount of waste of grouting materials, but also cause the delay of the construction period, thereby affecting the overall efficiency and quality of the goaf control work. SUMMARY

[0004] In view of the above problems, the present application provides a water-rich goaf underwater filling and reinforcement boundary control structure and method, which solves the problems of difficult control of the control boundary and slurry outflow caused by slurry flow and dispersion during underwater grouting, while ensuring the isolation effect of the boundary and reducing the grouting cost of different areas.

[0005] In order to achieve the above purpose, the present application is realized by the following technical scheme:

[0006] In a first aspect, the present application provides a water-rich goaf underwater filling and reinforcement boundary control structure, comprising: a curtain grout-stopping wall, a partition wall, and a slurry filling area; the curtain grout-stopping wall is arranged at the boundary range of the goaf control, and is used to prevent the outflow of the slurry; the partition wall is arranged in the internal space of the curtain grout-stopping wall, and the partition wall is provided with multiple partitions with a set distance between adjacent partitions; the slurry filling area is surrounded by the partition wall and the curtain grout-stopping wall, and the curtain grout-stopping wall and the partition wall together divide the goaf into a plurality of relatively independent slurry filling areas; the curtain grout-stopping wall is formed by pouring underwater grout-stopping wall construction materials and grouting boundary control materials; and the slurry filling area is formed by pouring underwater anti-dispersion grouting filling materials.

[0007] Further, the underwater stop grouting wall construction material is composed of ordinary cement and stop grouting wall grouting material; the stop grouting wall grouting material comprises water glass, water reducing agent and anti-dispersion agent.

[0008] The volume ratio of the underwater stop grouting wall construction material and the grouting boundary control material is 1:1-3:1, and the water quality and cement quality ratio of the cement grout is 0.5:1.0-0.8:1.0.

[0009] Further, the material used for the partition wall is completely same as the material used for the curtain stop grouting wall.

[0010] Further, the underwater anti-dispersion grouting filling material is composed of ordinary cement, fly ash, water and anti-dispersion agent, the water, ordinary cement and fly ash ratio is (0.5-1.0):(0.6-0.9):(0.4-0.1), the underwater retention rate of the underwater anti-dispersion grouting filling material is greater than 85%, and the proportion of the anti-dispersion agent in the dry material of the underwater anti-dispersion grouting filling material is less than or equal to 1%.

[0011] Further, the grouting boundary control material is super-high expansion grouting material.

[0012] In the second aspect, the application further provides a water-rich empty area underwater filling and reinforcement boundary control method, comprising:

[0013] S1. Arranging curtain stop grouting wall grouting holes in rows and at intervals around the range of the empty area to be treated; when the range of the empty area is large, arranging partition wall grouting holes in rows and at intervals; first performing drilling detection when constructing the drilling field to ensure that the drilling field will not expose the empty area and will not affect the drilling construction, otherwise selecting another position or taking measures;

[0014] S1. Establishing a grouting station and a grouting system, and testing, and then testing the grouting pipeline;

[0015] S2. Preparing underwater stop grouting wall construction material; grouting the curtain stop grouting wall grouting holes by using the underwater stop grouting wall construction material and the grouting boundary control material, ending the grouting of the hole after reaching the single-hole grouting setting standard, forming the curtain stop grouting wall, and if it is difficult to form, adjusting the field mixing ratio according to the grouting material and dynamically adjusting the final hole spacing;

[0016] S3. Grouting the partition wall grouting holes by using the underwater stop grouting wall construction material and the grouting boundary control material, ending the grouting of the hole after reaching the single-hole grouting setting standard, checking whether there is a leakage phenomenon, and forming the partition wall;

[0017] S4. After curtain grout-stopping wall and partition wall are formed, filling area grouting holes are drilled in the range of the grout filling area, the filling area grouting holes are grouted, the grouting of the hole is ended after the single-hole grouting setting standard is reached, leakage is checked, a drainage channel or a drainage hole is arranged during grouting, and a top-down partition hole sequence grouting process is adopted;

[0018] S5. The grouting effect is inspected by drilling holes at any time during construction, after all grouting holes are completed, the grouting record is analyzed, detection holes are arranged, and the detection is carried out by using the pressure grouting method.

[0019] Further, when the detection hole is drilled, the whole hole should be cored, and the core recovery rate of each round should be greater than 80%, and a double-layer core tube is used when the goaf caving zone is cored.

[0020] Further, the goaf treatment construction should be monitored once every 7 days during the construction, monitored once every half month within 3 months after the construction is completed, and monitored once a month thereafter.

[0021] Further, when the pressure grouting method is used for detection, the goaf treatment effect is quantitatively evaluated according to the grouting amount combined with the goaf element characteristics and design requirements, the detection grout is an underwater anti-dispersion grouting filling material, the end condition should be that the grouting amount in the hole per unit time is less than 5L / min, the grouting duration is 5-10min, the final hole pressure is 2-3MPa, and the pressure grouting amount is less than 10% of the average construction grouting amount to meet the design requirements.

[0022] Further, when the drilling field is constructed, if the drilling field needs to be exposed to the goaf or affect the drilling construction, the measures include but are not limited to changing the drilling field position, reinforcing the surrounding of the drilling field to ensure that the subsequent drilling construction is not affected.

[0023] Compared with the prior art, the application has the advantages and positive effects that:

[0024] The water-rich goaf underwater filling and reinforcement boundary control structure provided by the application sets a curtain grout-stopping wall in the boundary range of the goaf treatment, controls the boundary of the treatment, plays a closing role, and can effectively prevent the outflow of grout. This not only saves the cost, but also improves the grouting treatment effect and shortens the construction period. The large space inside the curtain grout-stopping wall is provided with a partition wall, which divides a large treatment area into small grouting units, and the partition treatment can effectively adjust the grouting parameters according to different conditions and situations, and improve the grouting treatment effect.

[0025] The present application is directed to the characteristics of the gob underwater grouting flow uncontrollable and the material easy to disperse and difficult to solidify under water, and uses the quick-setting controllable and anti-dispersive material, which can better coagulate and form in water, and is more suitable for the condition of underwater grouting. Different grouting materials are used for the curtain grouting wall, the partition wall and the slurry filling area, wherein the curtain grouting wall and the partition wall use the same grouting material, which is formed by grouting the double-liquid slurry of the grouting boundary control material and cement + controllable and anti-dispersive grouting material; the slurry filling area uses the slurry of ordinary cement + fly ash + anti-dispersive grouting material, and the material used in the filling area has relatively low cost, and can ensure that the strength and the like meet the requirements. BRIEF DESCRIPTION OF DRAWINGS

[0026] The accompanying drawings, which form a part of this specification, are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification. The embodiments of the present application, and their

[0027] Fig. 1 The present application is directed to the characteristics of the gob underwater grouting flow uncontrollable and the material easy to disperse and difficult to solidify under water, and uses the quick-setting controllable and anti-dispersive material, which can better coagulate and form in water, and is more suitable for the condition of underwater grouting. Different grouting materials are used for the curtain grouting wall, the partition wall and the slurry filling area, wherein the curtain grouting wall and the partition wall use the same grouting material, which is formed by grouting the double-liquid slurry of the grouting boundary control material and cement + controllable and anti-dispersive grouting material; the slurry filling area uses the slurry of ordinary cement + fly ash + anti-dispersive grouting material, and the material used in the filling area has relatively low cost, and can ensure that the strength and the like meet the requirements.

[0028] Fig. 2 The present application is directed to the characteristics of the gob underwater grouting flow uncontrollable and the material easy to disperse and difficult to solidify under water, and uses the quick-setting controllable and anti-dispersive material, which can better coagulate and form in water, and is more suitable for the condition of underwater grouting. Different grouting materials are used for the curtain grouting wall, the partition wall and the slurry filling area, wherein the curtain grouting wall and the partition wall use the same grouting material, which is formed by grouting the double-liquid slurry of the grouting boundary control material and cement + controllable and anti-dispersive grouting material; the slurry filling area uses the slurry of ordinary cement + fly ash + anti-dispersive grouting material, and the material used in the filling area has relatively low cost, and can ensure that the strength and the like meet the requirements.

[0029] In the figure: 1, curtain grouting wall; 2, partition wall; 3, slurry filling area; 4, filling area grouting hole. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed description is illustrative only and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0031] It should be noted that the terms used herein are merely for the purpose of describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should be understood that when the term "comprising" and / or "including" is used in this specification, it means that the presence of the features, steps, operations, devices, components and / or their combinations;

[0032] The present application provides a rich water gob underwater filling and reinforcing boundary control structure, which comprises a curtain grouting wall, a partition wall and a slurry filling area. Figs. 1-2As shown, it comprises: curtain grout retaining wall, partition wall and grout filling area; the curtain grout retaining wall is arranged at the boundary range of the goaf treatment, for preventing the outflow of grout; the partition wall is arranged in the internal space of the curtain grout retaining wall, and the partition wall is provided with multiple partitions, and the adjacent partition walls are spaced apart by a certain distance; and the grout filling area is surrounded by the partition wall and the curtain grout retaining wall, and the goaf is divided into a plurality of relatively independent grout filling areas by the curtain grout retaining wall and the partition wall.

[0033] Specifically, the curtain grout retaining wall is constructed by underwater grout retaining wall construction materials and grouting boundary control material, the underwater grout retaining wall construction materials are composed of ordinary cement and grout retaining wall grouting material; the grout retaining wall grouting material comprises water glass, water reducing agent, anti-dispersion agent;

[0034] The volume ratio of the underwater grout retaining wall construction material and the grouting boundary control material is 1:1-3:1, the water quality and the cement quality of the cement grout are in a ratio of 0.5:1.0-0.8:1.0, the setting time is 5s-180s, which can be controlled according to the site condition, the ordinary cement is 32.5 grade, and the grout can realize controllable rapid setting and good anti-dispersion.

[0035] Specifically, the material used for the partition wall is completely same as the material used for the curtain grout retaining wall.

[0036] Further, the grout filling area is filled by underwater anti-dispersion grouting filling material, the underwater anti-dispersion grouting filling material is composed of ordinary cement, fly ash, water and anti-dispersion agent, the water, ordinary cement and fly ash are in a ratio of (0.5-1.0):(0.6-0.9):(0.4-0.1), the ordinary cement is 32.5 grade, the fly ash meets the national second and third quality standards, the underwater anti-dispersion grouting filling material has an underwater retention rate of greater than 85%, the proportion of the anti-dispersion agent in the dry material of the underwater anti-dispersion grouting filling material is less than or equal to 1%, and the grout ratio is determined according to the site test.

[0037] Specifically, the grouting boundary control material is super-high expansion grouting material, and is single-liquid grouting, the liquid-solid ratio is 2:1-3:1, the material expansion ratio is greater than 50 times, it is green, safe and non-toxic, the actual amount is determined according to the site condition, and the super-high expansion grouting material is selected from existing materials, such as the super-high expansion grouting material disclosed in CN110835449B.

[0038] The embodiment also provides a water-rich goaf underwater filling and boundary control method, which comprises:

[0039] S1. Arranging curtain grouting wall grouting holes in rows and at intervals around the scope of the gob to be treated; when the scope of the gob is large, a row of partition wall grouting holes is constructed at intervals; drilling field construction is first detected to ensure that the drilling field will not expose the gob and will not affect drilling construction, otherwise, another location is selected or measures are taken to ensure that the drilling field under construction will not affect subsequent drilling construction;

[0040] S1. Establishing a grouting station and a grouting system, and conducting a trial run, and then conducting a pressure test on the grouting pipeline; the grouting station and the grouting system are composed of a material yard, a first-stage mixing pool, a second-stage mixing pool, a water supply system, a batching substation, a grouting pump, a pressure gauge, a hole sealing device, and a grouting pipeline;

[0041] S2. Preparing underwater grouting wall construction materials; using ordinary cement + controllable and anti-dispersion grouting material double slurry, determining the dosage of water glass and anti-dispersion material according to field tests to meet the requirements of controllable rapid setting and good anti-dispersion; grouting the curtain grouting wall grouting holes using underwater grouting wall construction materials and grouting boundary control materials, ending the grouting of the hole after the single-hole grouting set standard is met, forming a curtain grouting wall, and if formation is difficult, adjusting the field mix proportion of the grouting material and dynamically adjusting the final hole spacing;

[0042] S3. Grouting the partition wall grouting holes using underwater grouting wall construction materials and grouting boundary control materials, ending the grouting of the hole after the single-hole grouting set standard is met, checking for leakage, and forming a partition wall;

[0043] S4. After the curtain grouting wall and the partition wall are formed, drilling filling area grouting holes in the range of the slurry filling area, grouting the filling area grouting holes, ending the grouting of the hole after the single-hole grouting set standard is met, checking for leakage, and setting drainage channels or drainage holes during grouting to squeeze out the gob cavity or fissure water from the grouting area, so that the gob is effectively filled; the grouting of each slurry filling area should use a top-down separate-hole sequential grouting process to check the diffusion radius and grouting effect during the grouting process, and timely adjust the grouting hole spacing;

[0044] S5. During construction, drilling holes are constructed at any time to test the grouting effect, after all the grouting holes are completed, analyzing the grouting records and arranging detection holes, and using the pressure grouting method for detection.

[0045] Specifically, when drilling detection holes, full-hole coring should be performed, the opening diameter needs to be larger than the set size of the final hole diameter, and the core recovery rate of each pass should be greater than 80%, and double-layer core tubes are used when coring the caving zone.

[0046] Specifically, the goaf treatment construction period should be monitored once every 7 days; the goaf treatment construction is monitored once every half month within 3 months, and then monitored once every month. When the grouting method is used for detection, the goaf treatment effect should be quantitatively evaluated according to the grouting amount combined with the goaf element characteristics and the design requirements. The grouting fluid is underwater anti-dispersion grouting filling material. The end condition should be that the grouting amount in the hole per unit time is less than 5 L / min, the grouting duration is 5-10 min, the final hole pressure is 2-3 MPa, and the grouting amount is less than 10% of the average construction grouting amount to achieve the design requirements.

[0047] Specifically, when the drilling site is constructed, if the drilling site needs to uncover the goaf or affect the drilling construction, the measures to be taken include but are not limited to changing the drilling site position, reinforcing the surrounding of the drilling site to ensure that the subsequent drilling construction is not affected.

[0048] The above describes the specific embodiments of the present application in combination with the drawings, but is not a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications or changes made by those skilled in the art on the basis of the technical solutions of the present application without creative labor are still within the protection scope of the present application.

Claims

1. A water-rich goaf underwater filling reinforcement boundary control structure, characterized in that, The utility model relates to a kind of grouting curtain, partition wall and grout filling area for the treatment of goaf. The grouting curtain is arranged at the boundary of goaf treatment, to prevent grout from flowing out;The partition wall is arranged in the internal space of grouting curtain, and the partition wall is provided with multiple rows, and adjacent partition walls are spaced apart at a certain distance;The grout filling area is surrounded by partition wall and grouting curtain, and the goaf is divided into several relatively independent grout filling areas by grouting curtain and partition wall;The grouting curtain is made of underwater grouting curtain construction material and grouting boundary control material;The grout filling area is filled with underwater anti-dispersion grouting filling material. The underwater grouting curtain construction material is composed of ordinary cement and grouting curtain grouting material;The grouting curtain grouting material includes water glass, water reducing agent and anti-dispersing agent. The volume ratio of underwater grouting curtain construction material and grouting boundary control material is 1:1-3:1, and the water quality and cement quality ratio of cement slurry is 0.5:1.0-0.8:1.

0. The material used for the partition wall is the same as the material used for the grouting curtain. The underwater anti-dispersion grouting filling material is composed of ordinary cement, fly ash, water and anti-dispersing agent, and the water, ordinary cement and fly ash ratio is (0.5-1.0):(0.6-0.9):(0.4-0.1). The underwater retention rate of the underwater anti-dispersion grouting filling material is greater than 85%, and the proportion of anti-dispersing agent in the dry material of the underwater anti-dispersion grouting filling material is less than or equal to 1%. The grouting boundary control material is super-high expansion grouting material. The utility model relates to a kind of grouting curtain, partition wall and grout filling area for the treatment of goaf.

2. A water-enriched goaf underwater filling and reinforcing boundary control method for a water-enriched goaf underwater filling and reinforcing boundary control structure according to claim 1, characterized in that, S1. Arrange the grouting curtain grouting hole in rows and at a certain distance around the goaf range to be treated;When the goaf range is large, arrange the partition wall grouting hole at a certain distance;First, drill hole detection when drilling site to ensure that the drilling site does not expose the goaf and does not affect the drilling construction, otherwise, select another location or take measures; S2. Establish grouting station and grouting system, and test run, then do pressure test on grouting pipeline; S3. Prepare underwater grouting curtain construction material;Grout the grouting curtain grouting hole with underwater grouting curtain construction material and grouting boundary control material, and stop grouting when the single-hole grouting reaches the set standard, to form grouting curtain, if it is difficult to form, adjust the field mix ratio of grouting material, and dynamically adjust the final hole spacing; S4. Grout the partition wall grouting hole with underwater grouting curtain construction material and grouting boundary control material, and stop grouting when the single-hole grouting reaches the set standard, check for leakage, and form partition wall; S5. After the formation of grouting curtain and partition wall, drill the grout filling area grouting hole in the grout filling area range, and grout the grout filling area grouting hole, stop grouting when the single-hole grouting reaches the set standard, check for leakage, set drainage channel or drainage hole during grouting, and use top-down hole-by-hole sequential grouting process; S6. Test the grouting effect by drilling hole at any time during construction, after all grouting holes are completed, analyze grouting records and arrange detection holes, and use pressure grouting method for detection. ​ 3. A method of controlling the boundary of an underwater filling of a water- enriched void according to claim 2, characterized in that, When detecting the hole, the whole hole should be cored, and the core recovery rate of each round should be greater than 80%. When coring the caving zone, double-layer core barrels should be used.

4. A method of controlling the boundary of a water-filled gobs for water- filling and reinforcement according to claim 3, wherein During the treatment construction of the goaf, monitoring should be conducted every 7 days; within 3 months after the treatment construction, monitoring should be conducted every half month, and then monitoring should be conducted every month.

5. A method of controlling the boundary of a water-filled gobs for water- filling and reinforcement according to claim 2, wherein When using the pressure grouting method for detection, the treatment effect of the goaf should be quantitatively evaluated according to the grouting amount, combined with the element characteristics of the goaf and the design requirements. The grouting fluid should be the underwater anti-dispersion grouting filling material. The end condition should be that the grouting amount in the hole per unit time is less than 5 L / min, the grouting duration is 5-10 min, the final hole pressure is 2-3 MPa, and the pressure grouting amount is less than 10% of the average construction grouting amount, which meets the design requirements.

6. A method of controlling the boundary of a water-filled gobs for water- filling and reinforcement according to claim 2, wherein When drilling the site, if the drilling site needs to pass through the goaf or affect the drilling construction, the measures that should be taken include changing the drilling site position and reinforcing the surrounding of the drilling site to ensure that it does not affect the subsequent drilling construction.

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