Goaf grouting filling treatment quality detection method

Abstract

The invention discloses a goaf grouting filling treatment quality detection method. The method comprises the following steps that S1, a goaf is investigated, and investigation parameters are obtained; s2, a grouting process is designed based on the investigation parameters, and design parameters are obtained; s3, establishing an idealized model according to the reconnaissance parameters and the design parameters; s4, filling treatment construction is conducted on the goaf on the basis of the designed grouting technology; s5, comparing the density, determined by the idealized model, of the goaf after grouting treatment with the density, determined by the idealized model, of the goaf after actual grouting treatment, obtaining a density variable quantity, judging that grouting filling treatment is qualified if the compared density variable quantity meets the requirement, and judging that grouting filling treatment is qualified if the compared density variable quantity does not meet the requirement. And if yes, filling treatment construction is conducted on the goaf again or the grouting technology is adjusted. According to the quality detection method, the grouting effect can be detected, so that a construction unit can control the quality of a grouting project, and the overall grouting quality is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of coal mining, and in particular to a method for detecting the quality of grouting and filling treatment of goaf areas. Background Art

[0002] Goaf grouting treatment is a treatment method that performs high-pressure grouting into the broken rock strata in the goaf so that the slurry fills between the broken rocks, thereby reducing the shrinkage rate of the rock strata and reducing the subsidence and deformation of the surface. However, in the prior art, the grouting effect of the goaf is difficult to detect after grouting, which is not conducive to the construction unit's control of the project. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, an embodiment of the present invention proposes a quality detection method for grouting filling management in goaf areas. The quality detection method for grouting filling management in goaf areas can realize the detection of grouting effect, so that the construction unit can control the quality of the grouting project and ensure the overall grouting quality.

[0005] The method for detecting the quality of grouting filling treatment in goaf areas according to the embodiment of the present invention comprises the following steps:

[0006] S1: Survey the goaf and obtain survey parameters;

[0007] S2: designing a grouting process based on the survey parameters and obtaining design parameters;

[0008] S3: establishing an idealized model according to the survey parameters and the design parameters;

[0009] S4: Performing filling and treatment construction on the goaf based on the designed grouting process;

[0010] S5: Compare the density of the goaf determined by the idealized model and the density of the goaf after grouting treatment and obtain the density change. If the compared density change meets the requirements, the grouting filling treatment is determined to be qualified. If the compared density change does not meet the requirements, the goaf filling treatment construction is performed again or the grouting process is adjusted.

[0011] In some embodiments, the goaf density determined by the idealized model is determined by the following formula:

[0012]

[0013] Where: z V is the density of the goaf within the scope of density logging after treatment; cis the volume of the collapse zone within the range of density logging exploration; n is the actual porosity of the formation at the height of the collapse zone in the goaf; η is the filling coefficient of the slurry for the cracks and gaps in the goaf and the overlying rock formation; ρ y is the slurry density; ρ s is the water density; ρ c It is the average density of the collapsed zone before treatment.

[0014] In some embodiments, step S5 further includes the following steps:

[0015] determining a reference rock formation, and determining a density average value of the reference rock formation;

[0016] Obtain the measured density of the goaf after grouting treatment;

[0017] Obtaining an actual ratio of the measured density to the average density;

[0018] The actual ratio is compared with the ideal ratio determined by the idealized model to determine whether the density change meets the requirements.

[0019] In some embodiments, the measured density is obtained by a dual-source distance compensated density logging method.

[0020] In some embodiments, the dual-source distance compensated density logging method is provided with an excitation source, a first receiving point and a second receiving point, the distance between the first receiving point and the excitation source is 15 cm to 25 cm, and the distance between the second receiving point and the excitation source is 35 cm to 45 cm.

[0021] In some embodiments, the dual-source distance compensated density logging method is provided with a detection hole, and the drilling time of the detection hole lags behind the grouting completion time of the detection area by more than 14 days.

[0022] In some embodiments, step S5 further includes the following steps:

[0023] Segmenting the goaf along the longitudinal direction;

[0024] Acquire the measured density of each section of the divided goaf;

[0025] Obtaining an actual ratio of the measured density to the average density of each segment;

[0026] The actual ratio of each segment determined by the comparison analysis and the idealized model are compared to determine the ideal ratio of each segment.

[0027] In some embodiments, the measured density of each segment of the divided goaf is calculated by the following formula:

[0028]

[0029] Where: T C1、2... is the goaf ratio coefficient of C1, 2…sections; ρ C1、2、... is the average density value of the goaf area in sections C1, 2…; ρ w is the average density of the reference rock formation.

[0030] In some embodiments, the reference rock formation is a rock formation with the same lithology as the overlying rock of the mined coal seam.

[0031] In some embodiments, the survey parameters include the height of the collapse zone, the average density of the collapse zone, and the void ratio;

[0032] And / or, the design parameters include filling system and slurry density.

[0033] Beneficial effect: The quality detection method for grouting filling management of goaf areas of the embodiment of the present invention can realize the detection of grouting effect, so that the construction unit can control the quality of the grouting project and ensure the overall grouting quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a logic block diagram of the quality detection method according to an embodiment of the present invention.

[0035] Figure 2 It is a comparative schematic diagram of the goaf area before and after grouting treatment according to an embodiment of the present invention.

[0036] Figure 3 Schematic diagram of a dual-source distance-compensated density logging method according to an embodiment of the present invention.

[0037] Reference numerals:

[0038] 1- void area; 2- overburden collapse area; 3- filling area; 4- detection hole. DETAILED DESCRIPTION

[0039] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0040] like Figure 1 As shown, the method for detecting the quality of grouting filling treatment in goaf area according to the embodiment of the present invention comprises the following steps:

[0041] S1: Survey the goaf and obtain survey parameters. For example, the goaf can be surveyed through ground geophysical exploration, drilling core sampling, etc., or the overall survey can be conducted in combination with the known goaf morphology and mine construction design. After the survey, the corresponding survey parameters can be obtained, such as Figure 1As shown, the survey parameters may specifically include the height of the collapse zone and fracture zone, the average density of the collapse zone, the void ratio, etc.

[0042] S2: Design the grouting process based on the survey parameters and obtain the design parameters. The grouting process is also the grouting treatment design, such as Figure 1 As shown, the design parameters of the grouting process may include the filling system, the density of the grouting slurry, etc.

[0043] S3: Establishing an idealized model according to the survey parameters and the design parameters. For example, the idealized model may be a mathematical model, specifically a mathematical formula, a mathematical model, and the like.

[0044] S4: Based on the designed grouting process, fill and treat the goaf. Figure 2 As shown in Figure 2, before grouting treatment, the goaf was Figure 2 There is a void area 1 in the void area 1, which is filled with water, and the upper part of the void area 1 is the overburden collapse area 2. After grouting treatment, the goaf is filled with slurry, and a filling area 3 is formed in the goaf, and a part of the void area 1 is reserved above the filling area 3.

[0045] S5: Compare the density of the goaf after grouting treatment determined by the idealized model with the density of the goaf after actual grouting treatment and obtain the density change. If the compared density change meets the requirements, the grouting filling treatment is determined to be qualified. If the compared density change does not meet the requirements, the goaf is filled again or the grouting process is adjusted.

[0046] For example, the density of the goaf after grouting can be first obtained through an idealized model, which is referred to as the first density for easy distinction. Then, the actual density of the goaf after grouting treatment can be obtained through instruments and corresponding monitoring methods, which is referred to as the second density.

[0047] If the second density is not less than the first density, it means that the density of the goaf after grouting has reached the corresponding requirements, and the overall grouting treatment effect is in line with expectations. If the second density is less than the first density, it means that the density of the goaf after grouting has not reached the corresponding requirements, and the goaf needs to be supplemented with grouting treatment. At the same time, the grouting process determined above can also be optimized and adjusted, for example, some of the above design parameters can be adjusted.

[0048] In some embodiments, the goaf density determined by the idealized model is determined by the following formula:

[0049]

[0050] Where: zV is the density of the goaf within the scope of the density logging after treatment, which is also the density of the collapse zone; c is the volume of the collapse zone within the range of density logging exploration; n is the actual porosity of the formation at the height of the collapse zone in the goaf; η is the filling coefficient of the slurry for the cracks and gaps in the goaf and the overlying rock formation; ρ y is the slurry density; ρ s is the water density; ρ c is the average density of the collapsed zone before treatment. It should be noted that the independent variables in the above formula can be obtained in advance through survey, calculation, etc., which facilitates the calculation of the density of the goaf ρ z Calculation.

[0051] Specifically, when making a comparison, the density of the goaf after treatment can be calculated by the above formula: z , and then the density of the goaf ρ z It can be compared and analyzed with the actual goaf density determined by the above instruments and corresponding monitoring methods.

[0052] In some embodiments, step S5 further includes the following steps:

[0053] S51: Determine a reference rock layer, and determine the average density of the reference rock layer. For example, a rock layer with the same lithology density as the overburden in the goaf and stable can be selected as the reference rock layer, so that the density change calculated later can be closer to the actual working condition. The average density of the reference rock layer can be obtained by construction borehole density logging.

[0054] S52: Obtain the measured density of the goaf after grouting treatment. Specifically, the measured density of the goaf can be determined by instruments and corresponding methods, and the measured density is also the specific density value of the goaf after grouting filling.

[0055] S53: Obtaining an actual ratio of the measured density to the average density. Specifically, the measured density may be directly divided by the average density to obtain the actual ratio.

[0056] S54: Compare the actual ratio with the ideal ratio determined by the idealized model to determine whether the density change meets the requirements. For example, the density of the goaf after treatment can be calculated by the above formula: z , then the goaf density ρ z By comparing it with the average density of the reference rock formation, the ideal ratio can be obtained. Finally, the actual ratio determined above can be compared and analyzed with the ideal ratio. The grouting effect of the goaf can be judged based on the analysis results.

[0057] This can avoid the situation in which direct comparative analysis cannot be performed during the data sorting process due to different data reading methods provided by different types of logging equipment, thereby achieving the universality of result comparison.

[0058] In some embodiments, in step S52, the measured density is obtained by a dual-source distance compensation density logging method. For example, the dual-source distance compensation density logging method can be implemented by measuring the interaction between the γ particle field and the formation material, such as the Compton scattering effect and the photoelectric effect. The secondary γ scattered rays generated during the measurement process can be used to reflect the properties and reservoir characteristics of the formation to achieve the purpose of detecting density. The dual-source distance compensation density logging method is a logging method with two receiving points. This method can eliminate the influence of hole expansion and mud cake, thereby improving the precision and accuracy of the measurement.

[0059] In some embodiments, the dual-source distance compensated density logging method is provided with an excitation source, a first receiving point and a second receiving point, the distance between the first receiving point and the excitation source is 15 cm to 25 cm, and the distance between the second receiving point and the excitation source is 35 cm to 45 cm.

[0060] For example, Figure 3 As shown, the excitation source can be regarded as Figure 3 The source in the first receiving point can be regarded as Figure 3 The second receiving point can be regarded as a short source in Figure 3 With the long source in the well, the compensated density logging can be carried out in a specially constructed detection hole 4, wherein both the first receiving point and the second receiving point can be located above the excitation source, and the first receiving point is located between the excitation source and the second receiving point.

[0061] The distance between the first receiving point and the excitation source in the vertical direction may be 15 cm, 16 cm, 17 cm, 18 cm, 19 cm, 20 cm, 21 cm, 22 cm, 23 cm, 24 cm, 25 cm, etc. The distance between the second receiving point and the excitation source in the vertical direction may be 35 cm, 36 cm, 37 cm, 38 cm, 39 cm, 40 cm, 41 cm, 42 cm, 43 cm, 44 cm, 45 cm, etc.

[0062] In some embodiments, the dual-source distance compensation density logging method is provided with a detection hole 4, and the hole-making time of the detection hole 4 lags behind the grouting completion time of the detection area by more than 14 days. Specifically, on the 14th day after the grouting of the detection area for constructing the detection hole 4 is completed, another detection hole 4 can be constructed in the detection area, and the detection hole 4 is arranged in the middle area of ​​the construction hole. In this way, it can ensure the detection of the weak grouting area, and also allow the slurry to be completely solidified, thereby fully ensuring the accuracy of the data obtained.

[0063] In some embodiments, step S5 further includes the following steps:

[0064] The goaf is segmented along the longitudinal direction. For example, the longitudinal direction may be an up-down direction, and the goaf may be divided into multiple sections at a certain interval in the up-down direction, and the multiple goaf sections may be arranged sequentially along the up-down direction.

[0065] The measured density of each section of the divided goaf is obtained. For example, the density of each section of the goaf can be measured by the above-mentioned dual-source distance compensation density logging method, so as to obtain the measured density of each section.

[0066] The actual ratio of the measured density and the average density of each section is obtained. Specifically, the measured density of each section of the goaf can be divided by the average density of the reference rock formation, so as to obtain the actual ratio corresponding to each section.

[0067] The actual ratio of each section determined by the comparative analysis is determined with the idealized model to determine the ideal ratio of each section. Specifically, the density of the goaf of each section determined by the idealized model can be first calculated by the above formula, and then the ideal ratio of each section can be obtained by determining the ratio of the goaf density of each section to the average density of the reference rock formation, and the overall grouting effect can be judged by comparing and analyzing the actual ratio and the ideal ratio of each section.

[0068] Therefore, by dividing a single detection hole 4 into different goaf sections for comparison, the grouting change from bottom to top in the goaf can be obtained. Secondly, the same goaf section can also be divided into sections for comparison by detection holes 4 at different times and locations to obtain the grouting effect around each detection hole 4 at different times.

[0069] In some embodiments, the measured density of each segment of the divided goaf is calculated by the following formula:

[0070]

[0071] Where: T C1、2... is the goaf ratio coefficient of C1, 2…sections; ρ C1、2、... is the average density value of the goaf area in sections C1, 2…; ρ w is the average density value of the reference rock layer. Thus, the formula for calculating the actual ratio of each section of the goaf is realized.

[0072] Beneficial effects: After specific examples and comparative analysis, the control detection method of the embodiment of the present invention shows that the density value of the collapse zone after grouting can be increased by 4.06%, which is 3.98% higher than the idealized model calculation result, and the drilling verification of the physical distribution of the goaf is basically consistent, proving that the density detection method can be used for detection in the grouting control construction of complex goaf areas.

[0073] Considering the problem that different logging equipment cannot be directly compared, the embodiment of the present invention selects a reference stratum to calculate its average density value as a proportional parameter, thereby reducing the error. The reference stratum should be a thicker stratum with the same lithology as the overburden of the mined coal seam. In order to avoid the problem of being unable to directly compare and reduce the error at the same time, the same model of logging equipment can be used to collect data.

[0074] The time of drilling the detection hole 4 is more than 14 days from the end of grouting in the detection area, so that the complete solidification of the slurry can be fully guaranteed.

[0075] During the operation, the density detection method should be used to first conduct a detailed survey of the goaf morphology, determine the relevant parameters: collapse zone height, collapse zone average density, crack zone height, void ratio, and then select relevant parameters according to the construction design: filling coefficient, slurry density, perform idealized model calculations, and obtain the estimated lifting value of the construction design. Finally, it should be ensured that the actual detection lifting value should not be less than the idealized model lifting value.

[0076] In addition, in addition to testing and timely correcting the grouting process during construction, the density detection method can also be used in post-construction quality inspection. The density increase value expected in the treatment design is calculated through model calculation and compared with the actual increase value to achieve the detection purpose. Compared with the previous judgment based only on the density logging value increase, it has the advantages of being more quantitative and intuitive.

[0077] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0078] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0079] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0080] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0081] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0082] Although the above embodiments have been shown and described, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. Changes, modifications, substitutions and variations of the above embodiments by those of ordinary skill in the art are all within the scope of protection of the present invention.

Claims

1. A method for detecting the quality of grouting and filling treatment in goaf areas, characterized in that: The following steps are involved: S1: Survey the goaf and obtain survey parameters; S2: designing a grouting process based on the survey parameters and obtaining design parameters; S3: establishing an idealized model according to the survey parameters and the design parameters; S4: Performing filling and treatment construction on the goaf based on the designed grouting process; S5: Compare the density of the goaf determined by the idealized model and the density of the goaf after grouting treatment and obtain the density change. If the compared density change meets the requirements, the grouting filling treatment is determined to be qualified. If the compared density change does not meet the requirements, the goaf filling treatment construction is performed again or the grouting process is adjusted.

2. The method for detecting the quality of grouting and filling treatment of goaf according to claim 1 is characterized in that: The goaf density determined by the idealized model is determined by the following formula: Where: z V is the density of the goaf within the scope of density logging after treatment; c is the volume of the collapse zone within the range of density logging exploration; n is the actual porosity of the formation at the height of the collapse zone in the goaf; η is the filling coefficient of the slurry to the cracks and gaps in the goaf and the overlying rock formation; ρ y is the slurry density; ρ s is the water density; ρ c It is the average density of the collapsed zone before treatment.

3. The method for detecting the quality of grouting and filling treatment of goaf according to claim 1 is characterized in that: Step S5 also includes the following steps: determining a reference rock formation, and determining a density average value of the reference rock formation; Obtain the measured density of the goaf after grouting treatment; Obtaining an actual ratio of the measured density to the average density; The actual ratio is compared with the ideal ratio determined by the idealized model to determine whether the density change meets the requirements.

4. The method for detecting the quality of grouting and filling treatment of goaf according to claim 3 is characterized in that: The measured density is obtained by a dual-source distance compensation density logging method.

5. The method for detecting the quality of grouting and filling treatment of goaf according to claim 4 is characterized in that: The dual-source distance compensation density logging method is provided with an excitation source, a first receiving point and a second receiving point, the distance between the first receiving point and the excitation source is 15 cm to 25 cm, and the distance between the second receiving point and the excitation source is 35 cm to 45 cm.

6. The method for detecting the quality of grouting and filling treatment of goaf according to claim 4 is characterized in that: The dual-source distance compensation density logging method is provided with a detection hole, and the hole-making time of the detection hole lags behind the grouting completion time of the detection area by more than 14 days.

7. The method for detecting the quality of grouting and filling treatment of goaf according to claim 3 is characterized in that: Step S5 also includes the following steps: Segmenting the goaf along the longitudinal direction; Acquire the measured density of each section of the divided goaf; Obtaining an actual ratio of the measured density to the average density of each segment; The actual ratio of each segment determined by the comparison analysis and the idealized model are compared to determine the ideal ratio of each segment.

8. The method for detecting the quality of grouting and filling treatment of goaf according to claim 7 is characterized in that: The measured density of each section of the divided goaf is calculated by the following formula: Where: T C1、2 ...is the goaf ratio coefficient of C1, 2...sections; ρ C1、2 ,... are the average density values ​​of the goaf areas of C1, 2...; ρ w is the average density of the reference rock formation.

9. The method for detecting the quality of grouting and filling treatment of goaf according to claim 3 is characterized in that: The reference rock layer is a rock layer with the same lithology as the overlying rock of the mined coal seam.

10. The method for detecting the quality of grouting and filling treatment of goaf according to any one of claims 1 to 9, characterized in that: The survey parameters include the height of the collapsed zone, the average density of the collapsed zone, and the void ratio; And / or, the design parameters include filling system and slurry density.

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