Method, device and storage medium for quantifying prerequisite conditions of dynamic water inrush from overburden rock separation layer

Abstract

The present application provides an overburden strata separation dynamic water inrush prerequisite condition quantification method, equipment and storage medium, relates to the coal seam roof separation water disaster prevention field.The overburden strata separation dynamic water inrush prerequisite condition quantification method includes determining the influencing factors of the impact tendency when the upper strata breakage occurs, comparing and analyzing the differences in the impact tendency of the typical separation dynamic water inrush mode and the separation static water pressure water inrush mode cases when the upper strata breakage occurs, and determining the value range of the impact tendency of the upper strata breakage when the separation dynamic water inrush needs to be satisfied, which solves the problem of quantifying the separation dynamic water inrush prerequisite condition.

Description

Technical Field

[0001] This invention relates to the field of coal seam roof delamination water hazard prevention technology, specifically to a method, equipment, and storage medium for quantifying the prerequisites for dynamic water inrush caused by overburden delamination. Background Technology

[0002] Coal seam roof delamination occurs during underground coal mining when, after the formation of a goaf, uneven settlement of the overlying strata creates layered cavities between adjacent strata. Once formed, these delaminations collect water from surrounding aquifers, forming delamination water. When this delamination water suddenly flows down to the working face, it results in a delamination water inrush. Broadly speaking, delamination water inrush can be categorized into two types: water inrush caused by water-conducting fractures penetrating the delamination and water inrush caused by delamination water pressure. Water inrush caused by water-conducting fractures penetrating the delamination occurs because the fractures below the delamination extend upwards and connect with the delamination, triggering the inrush. Water inrush caused by delamination water pressure occurs because the water, under pressure, breaks through the protective layer below the delamination, causing the inrush. Further, based on the source of the delamination water pressure, delamination water inrush can be classified into dynamic delamination water inrush and hydrostatic delamination water inrush.

[0003] For water inrush caused by delamination pressure, a strong tendency for impact when the upper rock strata fracture is a prerequisite for the formation of the dynamic water inrush mode caused by delamination. Summary of the Invention

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this invention provides a method, equipment, and storage medium for quantifying the prerequisites for dynamic water inrush caused by overburden delamination, thus solving the problem of quantifying the prerequisites for dynamic water inrush caused by overburden delamination.

[0006] (II) Technical Solution

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] On the one hand, a method for quantifying the prerequisites for dynamic water inrush caused by overburden delamination is provided, including:

[0009] Determine the influencing factors of impact tendency when the upper rock strata fracture;

[0010] The differences in the influencing factors of impact tendency when the upper rock strata are fractured were statistically analyzed, compared and analyzed between typical dynamic water inrush mode and hydrostatic water inrush mode.

[0011] Determine the range of influencing factors on the impact tendency when the upper rock strata fracture, which is required for dynamic water inrush due to delamination.

[0012] Preferably, the influencing factors on the impact tendency when the upper rock stratum fractures include the bending stiffness of the upper rock stratum.

[0013] Preferably, the influencing factors on the impact tendency when the upper rock stratum fractures include the compressive strength of the upper rock stratum.

[0014] Preferably, the prerequisite for the delamination dynamic water inrush is that the upper rock stratum should simultaneously possess bending stiffness and compressive strength.

[0015] Preferably, the range of influencing factors on the impact tendency when the upper rock stratum fractures during the delamination dynamic water inrush must be: the compressive strength of the upper rock stratum ≥ 76.64 MPa, and the flexural stiffness of the upper rock stratum ≥ 1.02 × 10⁻⁶ MPa. 14 N·m 2 .

[0016] On the other hand, a device is provided, comprising:

[0017] At least one processor;

[0018] Memory, used to store at least one program;

[0019] When the at least one program is executed by the at least one processor, the at least one processor implements the above-described method for quantifying the prerequisites for dynamic water inrush caused by overburden separation.

[0020] In another aspect, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program that performs the above-described method for quantifying the prerequisites for dynamic water inrush caused by overburden delamination.

[0021] (III) Beneficial Effects

[0022] This invention provides a method, equipment, and storage medium for quantifying the prerequisites for dynamic water inrush caused by overburden delamination, thereby effectively solving the problem of quantifying the prerequisites for dynamic water inrush caused by overburden delamination. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the method flow of the present invention;

[0024] Figure 2 This is a schematic diagram of coal seam roof separation in an embodiment of the present invention;

[0025] Figure 3 This diagram illustrates the differences in impact tendency influencing factors and the range of impact tendency influencing factors that must be satisfied by the dynamic water inrush of delamination in this invention.

[0026] Among them, 1-coal seam; 2-water-conducting fracture zone; 3-lower protective layer; 4-exfoliated body; 5-upper rock strata; 6-overburden. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0028] Example

[0029] like Figure 1-3 As shown in the figure, this embodiment of the invention provides a method for quantifying the prerequisites for dynamic water inrush caused by overburden delamination. The specific steps are as follows:

[0030] S1. Determine the influencing factors of impact tendency. The overlying strata of coal seam 1, from bottom to top, are: water-conducting fracture zone 2, lower protective layer 3, exfoliated body 4, upper rock strata 5, and overburden 6. If the upper rock strata 5 has low bending stiffness, during the expansion of the exfoliated body 4, its easy bending will cause it to contact the lower protective layer 3 too quickly, resulting in the rapid closure of the exfoliated body 4 and a smaller scale. Furthermore, during the expansion of the exfoliated body 4, the upper rock strata 5 mainly exerts a slow squeezing effect on the water within the exfoliated body 4, making it difficult to generate a large-energy impact on the water within the exfoliated body 4. Only when the upper rock stratum 5 has high bending stiffness is it difficult for it to bend, and the space of the delamination body 4 is not easy to close too quickly, making it easy to form a large-scale delamination body 4. Moreover, the closure of the delamination body 4 only occurs when the upper rock stratum 5 breaks, resulting in the closure of the delamination body 4 being accompanied by the breakage of the upper rock stratum 5, which easily generates an impact on the water body within the delamination body 4. On the other hand, the lower the compressive strength of the upper rock stratum 5, the greater the possibility of the upper rock stratum 5 undergoing compressive-shear failure before the delamination body 4 closes. This results in a large number of compressive-shear fractures being generated in the rock body before the upper rock stratum 5 undergoes a large and complete breakage. A large amount of elastic potential energy will be released prematurely with the formation of these compressive-shear fractures. The structural integrity of the upper rock stratum 5 will also be destroyed before the large and complete breakage occurs due to the appearance of a large number of compressive-shear fractures. Ultimately, when the upper rock stratum 5 undergoes a large and complete breakage and the space of the delamination body 4 closes, it is difficult to cause a sudden release of large energy and to generate a large impact on the water body within the delamination body 4. Therefore, the influencing factors of impact tendency are the bending stiffness and compressive strength of the upper rock strata.

[0031] S2. Statistically compare and analyze the differences in impact tendency in typical dynamic and hydrostatic water inrush modes between delamination and typical hydrostatic water inrush modes. Statistically analyze the flexural stiffness and compressive strength of the overlying rock strata in typical and hydrostatic water inrush cases. The statistical results are as follows: Figure 3 As shown. By Figure 3It can be seen that in the cases of dynamic water inrush due to delamination, the compressive strength of the upper rock stratum 5 is greater than that in the cases of hydrostatic water inrush due to delamination, and the flexural stiffness of the upper rock stratum 5 is generally greater in the cases of dynamic water inrush due to delamination. Therefore, it can be inferred that the prerequisite for dynamic water inrush due to delamination is that the upper rock stratum 5 simultaneously possesses high flexural stiffness and compressive strength.

[0032] S3. Determine the range of values ​​for the impact tendency influencing factors that must be satisfied for dynamic water inrush after delamination. (See Appendix) Figure 2 Within this context, the average of the minimum compressive strength of the upper rock stratum 5 (113.28 MPa) in the case of dynamic water inrush from delamination and the maximum compressive strength of the upper rock stratum 5 (40 MPa) in the case of hydrostatic water inrush from delamination, totaling 76.64 MPa, is taken as the boundary value between dynamic water inrush from delamination and hydrostatic water inrush from delamination in terms of the compressive strength of the upper rock stratum 5. The minimum flexural stiffness of the upper rock stratum 5 in the case of dynamic water inrush from delamination is also taken as 1.02 × 10⁻⁶ MPa. 14 N·m 2 The minimum flexural stiffness of the superstructure rock layer required for dynamic water inrush due to delamination is used as the criterion. Based on this, the range of values ​​for the impact tendency influencing factors required for dynamic water inrush due to delamination is: the compressive strength of superstructure rock layer 5 ≥ 76.64 MPa, and the flexural stiffness of superstructure rock layer 5 ≥ 1.02 × 10⁻⁶ MPa. 14 N·m 2 ( Figure 3 ).

[0033] The typical characteristics of dynamic water inrush cases involving aquifer separation are: no warning signs, short duration (less than 1 day), and manifestation of dynamic phenomena. The key cause of dynamic water inrush cases lies in the fact that the water body in the aquifer can be subjected to a sudden release of large energy before the aquifer closes (Table 1). The typical characteristics of hydrostatic water inrush cases involving aquifer separation are: warning signs (water spray) before the inrush, long duration (more than 1 week), and high water pressure in the filled aquifer (more than 3 MPa). The key cause of hydrostatic water inrush cases lies in the fact that the water body in the aquifer can obtain a large water pressure, and the water pressure that breaks through the aquitard is slowly loaded rather than caused by a sudden release of large energy (Table 2).

[0034] Table 1. Typical cases of dynamic water inrush after delamination, including characteristics and causes of water inrush.

[0035]

[0036] Table 2. Typical cases of hydrostatic pressure-induced water inrush due to separation of water layer and their characteristics and causes.

[0037]

[0038]

[0039] Among them, the water inrush process of the delamination dynamic water inrush mode is as follows: as the scale of the delamination body 4 increases with the expansion of the mining scale of coal seam 1, the overhanging area of ​​the upper rock stratum 5 gradually increases. When the overhanging area of ​​the upper rock stratum 5 increases to a certain extent, it suddenly breaks and generates a large impact tendency, which impacts and beats the delamination water, and forms a large delamination water superstatic pressure in the delamination water. Under the action of superstatic water pressure, the delamination water breaks through the lower protective layer 3 and surges into the goaf, generating delamination dynamic water inrush; the water inrush process of the delamination static water pressure water inrush mode is as follows: when The size of the exfoliated body 4 increases with the expansion of the mining scale of coal seam 1, and the area of ​​the upper rock strata gradually increases. Since the upper rock strata 5 only undergoes slow deformation and sinking without breaking or breaking but without a large impact tendency at the moment of breaking, the upper rock strata 5 will not have a large impact or pounding effect on the exfoliated water during the closure process of the exfoliated body 4. The exfoliated water pressure slowly penetrates and squeezes the lower protective layer 3 under its own hydrostatic pressure. When the exfoliated water breaks through the lower protective layer 3 under the action of hydrostatic pressure and surges to the goaf, the exfoliated hydrostatic pressure water inrush occurs.

[0040] In summary, for water inrush caused by delamination pressure, the strong impact tendency of the upper rock stratum 5 when it breaks is a prerequisite for the formation of the dynamic water inrush mode caused by delamination. The above method solves the problem of quantifying the prerequisite for dynamic water inrush caused by delamination.

[0041] On the other hand, a device is provided, comprising:

[0042] At least one processor;

[0043] Memory, used to store at least one program;

[0044] When the at least one program is executed by the at least one processor, the at least one processor implements a method for quantifying the prerequisites for dynamic water inrush in an overburden separation, as described in the embodiment.

[0045] In another aspect, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program of a method for quantifying prerequisites for dynamic water inrush in an overburden delamination according to an embodiment of the present invention.

[0046] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for quantifying the precursors of dynamic water inrush from overburden separation, characterized in that, The method comprises the following steps: determining the impact tendency of the upper stratum when the upper stratum is broken, wherein the impact tendency of the upper stratum when the upper stratum is broken includes the bending stiffness and the compressive strength of the upper stratum; statistically comparing and analyzing the differences between the impact tendency of the upper stratum when the upper stratum is broken in the typical separation dynamic water inrush mode and the typical separation static water pressure water inrush mode; The value range of the influencing factor of the impact tendency of the upper rock layer when the upper rock layer is broken to determine the separation layer dynamic water inrush is: the compressive strength of the upper rock layer ≥76.64 MPa, and the bending stiffness of the upper rock layer ≥ .

2. The method according to claim 1, characterized in that: The prerequisite condition of the separation dynamic water inrush is that the upper stratum should have both the bending stiffness and the compressive strength.

3. An apparatus, comprising: The method comprises the following steps: at least one processor; a memory for storing at least one program; when the at least one program is executed by the at least one processor, the at least one processor implements the method for quantifying the prerequisite condition of the separation dynamic water inrush in the overburden stratum according to any one of claims 1-2.

4. A computer-readable storage medium, characterized in that, The computer readable storage medium stores the computer program for executing the method for quantifying the prerequisite condition of the separation dynamic water inrush in the overburden stratum according to any one of claims 1-2.

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