Coordinated mining induced antisymmetric settlement superimposed balance control method for rock formations

Abstract

The present invention discloses a coordinated mining-induced antisymmetric settlement superimposed balance control method for rock formations, including conducting geological exploration, determining the movement of rock formations, adjusting the mining height of the working face, adjusting the relative position of the working face, adjusting the advancement direction of the working face, adjusting the mining sequence and time, and monitoring the actual control effect; the present invention aims at the problems of aggravated rock formation settlement caused by the superposition of mining disturbances in the coordinated mining of coal and co-existing minerals, and the difficulty in ground pressure management, and comprehensively considers the spatiotemporal relationship between coal mines and co-existing minerals, and establishes a coordinated control method for rock formation deformation dynamic balance of "coordinated mining-deformation induction-settlement balance". The implementation of this technical invention can ensure that the coordinated mining of coal and co-existing minerals is carried out efficiently and safely.

Description

Technical Field

[0001] The invention relates to the field of coal mining, and in particular to a method for superimposed balance control of antisymmetric settlement of strata induced by coordinated mining. Background Art

[0002] my country is a major energy consumer, with coal resources accounting for more than half of the domestic energy supply. At the same time, China is in a stage of rapid development in various industries, and the demand for various mineral resources is increasing. Coal-related associated resources are of many types and rich in reserves, so the coordinated mining of coal and associated minerals is gradually being promoted and applied. When the underground mining method is used for the coordinated mining of multiple mineral species, the goaf formed after the mineral is mined will cause the overlying rock strata to collapse and sink. The area where the rock strata continuously bend and sink downward can be called a curved sinking zone. The shape and size of the curved sinking zone and its settlement are mainly controlled by the shape and size of the goaf. The shape of the curved sinking zone is similar to that of the goaf. The larger the goaf area, the wider the bending and sinking range, and the higher the goaf height, the more obvious the bending and sinking phenomenon.

[0003] In the coordinated underground mining of coal and associated minerals, the mining disturbance ranges of various minerals often intersect and overlap, resulting in rock strata movement forms that are different from the previous separate mining of various minerals. The most obvious one is that the overlap of the curved subsidence zones formed by the mining of various minerals will form complex and diverse rock strata movement situations, causing irregular subsidence of the overburden, further increasing the surface settlement and aggravating the destruction of the surface landform. In addition, it will also complicate the distribution of ground stress and increase the difficulty of ground pressure management. Therefore, it is of great significance to achieve induction and regulation of curved subsidence in the coordinated mining of multiple minerals so that the rock strata settlement reaches a superimposed balance, which is of great significance for reducing environmental damage and reducing production management costs. Summary of the invention

[0004] In view of the above-mentioned technical deficiencies, the purpose of the present invention is to provide a method for coordinated mining to induce antisymmetric settlement of rock strata and superimposed balance control. Through preliminary geological exploration, the movement of overburden before control is analyzed, and a targeted antisymmetric settlement superimposed balance control scheme is proposed. The layout of the coal and associated mineral mining working face is adjusted spatially, the coal and associated mineral recovery sequence is adjusted in time, and the coal and associated mineral recovery time is reasonably arranged to form an antisymmetric settlement superimposed balance control zone in the curved subsidence zone of the coordinated mining of coal and associated minerals. Subsequently, the actual control effect is tracked and monitored and timely feedback is given, the antisymmetric settlement superimposed balance control scheme is optimized accordingly, and a rock deformation dynamic balance coordinated control method of "coordinated mining-deformation induction-sedimentation balance" is established.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] The present invention provides a coordinated mining induced rock stratum antisymmetric settlement superposition balance control method, comprising the following steps:

[0007] S1. Conduct geological exploration: collect hydrogeological information of the mining area through exploration drilling in the coordinated mining area;

[0008] S2. Determine the movement of rock formations: Based on the above hydrogeological information, analyze the movement of overlying rock formations in the goaf during the coordinated mining process through similarity simulation, numerical simulation and field measurement;

[0009] S3. Adjust the mining height of the working face: according to the buried depth of the coal seam and the associated minerals, as well as the surface subsidence coefficient during the mining of the coal mine and the associated minerals, adjust the mining height of the working faces of the two;

[0010] S4. Adjust the relative position of the working face: According to the relationship between the coal seam and the associated mineral deposits, as well as the movement boundary and subsidence of the rock strata during the mining of coal mines and associated minerals, the relative position of the two working faces is reasonably adjusted, and the antisymmetry of the curved subsidence zone is used to control the subsidence of the rock strata to achieve a coordinated balance;

[0011] S5. Adjust the advancement direction of the working face: According to the relationship between the coal seam and the associated mineral deposits, as well as the shape of the curved subsidence zone formed by the mining of the two, adjust the advancement direction of the coal mine and the associated mineral deposits, and use the antisymmetry of the curved subsidence zone to control the rock stratum settlement to achieve a coordinated balance;

[0012] S6, adjusting the mining sequence and time: according to the relationship between the coal seam and the associated mineral deposits, and the range of the curved subsidence zone formed by the mining of the two, based on the mining height, relative position and advancement direction of the working face optimized in the above steps S3 to S5, the mining sequence of the two is adjusted accordingly by utilizing the hysteresis of the bending and subsidence of the overlying rock strata in the goaf, and the mining time of the two is reasonably arranged;

[0013] S7. Monitor the actual control effect: monitor the movement of the overlying rock strata in the mining area, and provide timely feedback on the actual control effect for optimization of the control plan.

[0014] Preferably, in step S1, hydrogeological information is collected by drilling, the drilling density is determined according to the geological complexity, the drilling depth is not less than the burial depth of the main coal seam and the associated mineral resources, and the hydrogeological information includes the stratigraphic position, lithology, structural structure, stratigraphic contact relationship, pore water pressure, and geostress of the detected strata.

[0015] Preferably, in step S2, since coal and co-existing bauxite are both solid minerals, the similarity simulation experiment selects a plane similarity simulation which is relatively simple to operate and has relatively intuitive results, wherein the surface subsidence coefficient is an important parameter for predicting surface movement and deformation in the mining-affected area, and its size is related to the mining method, roof management method, total mining thickness, mining depth and lithology of the overlying strata.

[0016] Preferably, in step S4, since the distance between the coal seam and the bauxite layer is constant, the relative position of the coal mine and the bauxite working faces is determined by the horizontal projection distance perpendicular to the advancing directions of the two.

[0017] Preferably, in step S5, when the advancing directions of the coal mine and the bauxite working faces are consistent, the two will continue to influence each other during the mining process due to the close distance between the working faces, and will aggravate the sinking of the rock strata, so the advancing directions of the two are adjusted to face each other.

[0018] Preferably, in step S6, the adjustment of the mining sequence needs to take into account the mutual influence of coal and associated minerals during the mining process, so as to avoid the serious impact of the prior mining of a certain mineral on the subsequent mining of another mineral, resulting in a waste of resources.

[0019] Preferably, in step S7, the monitoring contents include the development range of the curved subsidence zone, the shape of the curved subsidence zone and the subsidence amount of the overburden in the goaf area.

[0020] The beneficial effects of the present invention are as follows: the present invention aims at the problems of aggravated rock stratum settlement and difficulty in ground pressure management caused by the superposition of mining disturbances in the coordinated mining of coal and associated minerals, comprehensively considers the spatiotemporal relationship between coal mines and associated minerals, and establishes a coordinated control method for rock stratum deformation dynamic balance of "coordinated mining-deformation induction-settlement balance". The implementation of this technical invention can ensure the efficient and safe coordinated mining of coal and associated minerals; its main advantages are:

[0021] 1. Reduced damage to the surface landform. By optimizing the layout of the working face and arranging the order and time of mineral mining, the antisymmetry of the curved subsidence zone of coal mining and associated mineral mining is used to control the rock stratum settlement to achieve a coordinated balance, reducing the surface subsidence while making the curved subsidence zone more regular, reducing the degree of damage to the surface landform caused by surface subsidence.

[0022] 2. Reduced the difficulty of mine ground pressure management. By inducing deformation and subsidence of the overlying rock strata in the goaf, the settlement of the rock strata in the coordinated mining of coal mines and associated minerals is generally coordinated, reducing the complexity of ground stress distribution, avoiding the emergence of more stress concentration areas, and to a certain extent improving the stability of security coal pillars or ore pillars, reducing the cost of shaft and tunnel maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of rock stratum subsidence during single mining of a coal mine provided by an embodiment of the present invention;

[0025] Figure 2 A schematic diagram of the superposition of rock strata settlement in the superimposed mining of coal and associated minerals provided in an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the antisymmetric settlement superposition balance of rock formations for staggered mining of coal and associated minerals provided in an embodiment of the present invention;

[0027] Figure 4 A schematic diagram of the superposition of rock strata settlement during the same-direction mining of coal and associated minerals provided in an embodiment of the present invention;

[0028] Figure 5 A schematic diagram of the antisymmetric settlement superposition balance of strata for coal and associated minerals mined in opposite directions provided by an embodiment of the present invention;

[0029] List of reference numerals:

[0030] 10. Coal seam;

[0031] 20. Bauxite layer;

[0032] 31. Coal mine working face;

[0033] 41. Bauxite working face;

[0034] 50. Coal mine rock movement angle;

[0035] 60. Bauxite rock movement angle;

[0036] 70. Movement boundary of coal mine rock formation;

[0037] 80. Bauxite rock formation movement boundary;

[0038] 91. Coal mines are used to mine curved and subsided zones separately;

[0039] 92. Dislocated mining of the curved and subsided zone of coal mines;

[0040] 93. Mining the curved and subsided zone of coal mines in the same direction;

[0041] 94. Mining the curved subsidence zone of coal mines in opposite directions;

[0042] 101. Bauxite is mined alone in the curved and subsided zone;

[0043] 102. Dislocated mining of bauxite in the curved and subsided zone;

[0044] 103. Mining the bauxite curved sinking zone in the same direction;

[0045] 104. Mining bauxite in opposite directions in the curved sinking zone;

[0046] 111. Superimposed mining and superimposed curved subsidence zones;

[0047] 112. Dislocated mining with superimposed curved subsidence zone;

[0048] 113. Mining in the same direction with superimposed curved subsidence zone;

[0049] 114. Opposite mining superimposed curved subsidence zone;

[0050] 120. The distance between coal seam and bauxite layer;

[0051] 130. Horizontal projection distance between coal mine working face and bauxite working face. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Example 1: Taking the coal-aluminum symbiotic area of ​​Luliang, Shanxi as an example, the implementation process of the coordinated mining induced stratum antisymmetric settlement superposition balance control method is described in detail. The region is rich in resources such as coal and aluminum, and the overall occurrence form is coal-aluminum. The main coal seam 10 of the coal mine is located in the lower section of the Taiyuan Group, with an average burial depth of about 280m, and about 55m below the bauxite layer 20. The thickness of the coal seam 10 is 9.84-13.42m, with an average of 12.35m, which is a stable and exploitable coal seam in the well field. The bauxite burial depth in the whole area is between 0 and 351m, and it is located in the middle and lower part of the first section of the Benxi Group of the Middle Carboniferous System, above the top erosion surface of the Fengfeng Group of the Middle Ordovician System, and the occurrence elevation is 836-1140m. The spatial morphology of the ore body is layered and layered, with an average thickness of 2.8m and a relatively continuous distribution. Bauxite and coal are similar in occurrence form, and are generally layered sedimentary minerals. In the coordinated underground mining of coal and bauxite, the distribution of ground stress under the superposition of the mining disturbance of the two will be more complicated, and the settlement form of the overlying rock strata in the goaf is also different from that of the single mining, which will cause more serious damage to the surface landform. Therefore, it is necessary to induce the deformation of the rock strata in the process of coordinated mining of coal and aluminum to achieve antisymmetric settlement and achieve the superposition balance of the settlement of the coordinated mining rock strata.

[0054] The specific implementation steps of the coordinated mining-induced rock stratum antisymmetric settlement superimposed balance control method are as follows:

[0055] S1: Geological exploration: Drill from the surface or underground to the top and bottom rock layers of coal seam 10 and bauxite layer 20 in the coordinated mining area to obtain geological information; specifically including the detection of the stratigraphic position, lithology, structural structure, stratigraphic contact relationship, pore water pressure, geostress, etc. of the strata. Test the rock physical and mechanical properties of each stratum based on the core obtained by drilling; the rock physical and mechanical properties of the stratum include density, color, porosity, permeability, crack density, crack connectivity, water absorption and expansion characteristics, compressive strength, tensile strength, cohesion, internal friction angle, elastic modulus, Poisson's ratio, fracture toughness, etc. The density of the detection borehole is determined according to the complexity of the stratum structure, and faults, collapse columns, karst caves and other geological structures that are easy to conduct water are detected. All boreholes are fully grouted and plugged during the withdrawal of drilling.

[0056] S2: Determine the movement of rock formations: Based on the geological information obtained in step S1, estimate various movement and deformation values ​​of the ground surface according to the geological mining conditions. The movement of the overlying rock formations in the goaf after the mining of the coal mine working face and the bauxite working face is analyzed by means of plane similarity simulation, numerical simulation and on-site measurement, including the coal mine rock formation movement angle 50, the coal mine rock formation movement angle 60 and the surface subsidence coefficient. When the coal mine is mined alone, the coal mine rock formation movement boundary 70 can be determined by the coal mine rock formation movement angle 50, and then combined with the size of the coal mine working face 31, the scope of the surface subsidence caused by coal mining can be roughly judged, and the outline of the curved subsidence zone 91 of the coal mine mining alone can be obtained, such as Figure 1 As shown, the surface subsidence coefficient can be used to predict the amount of surface subsidence, and the same is true for bauxite.

[0057] It should be noted that there will be certain deviations in the estimation of the rock movement angle and the surface subsidence coefficient, and those calculated through field measurements and simulation experiments are no exception. However, the errors are within the correctable range, and the parameters can be corrected in a timely manner through monitoring and feedback of rock movement during subsequent control processes.

[0058] S3: Adjust the mining height of the working face: When full mining is achieved, the surface subsidence is mainly controlled by the mineral burial depth, total mining thickness and surface subsidence coefficient. When the mineral burial depth and surface subsidence coefficient are constant, the surface subsidence can only be controlled by adjusting the mining height. Of course, the surface subsidence can also be reduced by filling mining, but this is equivalent to reducing the mining height in disguise.

[0059] pass Figure 2 It can be seen that when the coal mine working face 31 and the bauxite working face 41 overlap, the total mining thickness increases, the surface subsidence will also increase accordingly, and the shape of the curved subsidence belt will also change to form a superimposed curved subsidence belt. Obviously, the concave degree of the superimposed curved subsidence belt 111 of superimposed mining is greater than that of the curved subsidence belt 91 of coal mine mining alone and the curved subsidence belt 101 of bauxite mining alone.

[0060] Therefore, in order to reduce rock settlement and the occurrence of ruggedness in ground settlement areas, the mining heights of the coal mine working face 31 and the bauxite working face 41 can be adjusted according to the burial depths of the coal seam 10 and the bauxite layer 20 obtained in step S1 and the surface subsidence coefficient of the coal mine and associated mineral mining obtained in step S2, so as to try to control the surface settlement of the two to be basically the same, and then combine with subsequent steps to achieve superimposed balance control of rock settlement.

[0061] S4: Adjust the relative position of the working face: According to the borehole geological information collected in step S1, determine the spatial location of the coal seam 10 and the bauxite layer 20. After the mining heights of the coal mining working face 31 and the bauxite working face 41 are determined in step S3 so that the surface settlement of the coal mining and the bauxite mining are in a consistent balance, the relative positions of the two working faces are adjusted to form a staggered mining layout perpendicular to the advancing direction of the working face to induce antisymmetric settlement of the rock formation.

[0062] First, the distance 120 between the coal seam and the bauxite layer is determined based on the occurrence stratum relationship between the coal seam 10 and the bauxite layer 20. Combined with the rock stratum movement boundary obtained in step S2, the horizontal projection distance 130 between the coal mine working face and the bauxite working face is determined, so that the settlement of the coal mine and bauxite mining strata reaches an antisymmetric settlement superposition balance. Figure 3As shown, after adjusting the mining heights of the coal mine working face 31 and the bauxite working face 41, the degree of concavity of the dislocated mining coal mine curved subsidence zone 92 and the dislocated mining bauxite curved subsidence zone 102 are basically the same, and then the relative positions of the working faces are adjusted, and the antisymmetry of the edges of the subsidence zones is utilized to make the shape of the dislocated mining superimposed curved subsidence zone 112 smooth and regular. At the same time, compared with the superimposed mining subsidence curved zone 111, its degree of concavity will be significantly reduced.

[0063] Through the above method, the rock strata settlement of coordinated mining of coal and bauxite can be achieved in a coordinated manner, the complexity of the shape of the curved subsidence zone can be reduced, the difficulty of ground pressure management can be reduced, the occurrence of ground step subsidence can be reduced, and the damage to the surface landform can be reduced.

[0064] S5: Adjust the advancing direction of the working face: Since the advancing speed of the working face is generally much faster than the bending and sinking speed of the rock strata, the bending and sinking of the rock strata has a lag. The advancing direction of the working face will affect the bending and sinking shape of the overlying rock strata in the goaf. Specifically, the sinking degree of the overlying rock strata in the old area of ​​the goaf is greater than that in the new area of ​​the goaf, such as Figure 4 As shown in the figure, the concave degree of the upper curved sinking zone of the coal mine goaf and the bauxite goaf decreases along the advancing direction of the working face.

[0065] When coal and bauxite are mined in the same direction, the rock formation sinking shape above the coal working face 31 and the bauxite working face 41 is more complicated than that of separate mining, and the sinking amount will also increase to a certain extent, such as Figure 4 As shown, the same-direction mining superimposed curved subsidence zone 113 formed by the superposition of the same-direction mining coal mine curved subsidence zone 93 and the same-direction mining bauxite curved subsidence zone 103 is extremely irregular in shape, and the degree of concavity is significantly increased, which will inevitably increase the difficulty of ground pressure management and aggravate the damage to the surface landform.

[0066] By adjusting the mining directions of coal mine and bauxite to be opposite, that is, the coal mine working face 31 and the bauxite working face 41 are advancing in opposite directions at the same time, and adjusting the mining height of the working face to control the mining subsidence of coal mine and bauxite to be consistent, the morphology of the overlapping area of ​​the overlying rock strata of the two presents antisymmetry, such as Figure 5 As shown, at this time, compared with the sinking curved zone 113 mined in the same direction, the concave degree of the superimposed curved sinking zone 114 mined in opposite directions will be significantly reduced, and the overall shape will be more regular, which is conducive to reducing the difficulty of mine ground pressure management and reducing damage to the surface landform.

[0067] S6: Adjust the mining sequence and time: Based on the optimization of the working face layout in the above steps, combined with the range of the curved subsidence zone formed by coal and bauxite mining, and utilizing the hysteresis of the bending and subsidence of the overlying rock strata in the goaf, make corresponding adjustments to the mining sequence of the two, and reasonably arrange the mining time of the two.

[0068] It should be pointed out that the adjustment of the mining sequence needs to take into account the possible mutual influence between coal and bauxite mining processes, so as to avoid the serious impact of the prior mining of one of the minerals on the subsequent mining of the other mineral, reduce the resource recoverability, and lead to waste of resources. It can be seen from step S1 that the coal seam 10 is located above the bauxite layer 20. The movement of the overburden caused by the prior mining of the lower bauxite may cause the upper coal seam 10 to shift, affecting the continuous advancement of the subsequent longwall mining face. Correspondingly, when the upper coal seam 10 is mined first, the water and gas accumulated in the coal mine goaf may also infiltrate into the lower bauxite goaf along the conductive fissures, affecting the production safety of the bauxite.

[0069] Taking all factors into consideration, when arranging the coal mine for advance mining, it is necessary to wait until the overburden in the coal mine goaf is compacted, the drainage water inside the goaf is discharged, and the gas concentration is reduced to the safety standard, and then arrange the lower bauxite to be mined in a staggered manner according to the above step S2 to ensure the balance of rock stratum settlement. When arranging the bauxite for advance mining, in order to avoid the integrity of the coal seam being damaged by the movement of the overburden in the bauxite goaf after a period of time, the mining of the coal mine can take advantage of the hysteresis of rock stratum settlement, and carry out staggered mining or opposite mining at the same time to achieve the balance of rock stratum settlement. By adjusting the mining order and time of coal mines and bauxite by the above method, the mutual influence between the two in coordinated mining can be reduced, and the superimposed balance regulation of rock stratum settlement can be achieved at the same time.

[0070] S7: Monitor the actual control effect: Monitor the movement of the overburden strata in the mining area, including the development range of the curved subsidence zone, the shape of the curved subsidence zone, and the amount of overburden subsidence, and provide timely feedback on the actual control effect. Optimize the control plan based on the feedback of the stratum movement, readjust the layout of the coal and associated mineral mining faces in a targeted manner, and make appropriate adjustments to the mining schedule of the two to ultimately meet the control needs.

[0071] When it is monitored that the settlement amounts of coal mining and bauxite mining are inconsistent, it is impossible to effectively achieve the antisymmetric settlement superposition balance of the rock strata. At this time, it is necessary to adjust the mining height of the coal mine working face or the bauxite working face based on the difference in settlement amounts, the burial depths of the coal seam 10 and the bauxite layer 20, and the surface subsidence coefficient, so that the settlement amounts of the overlying rock strata in the goaf of the two are consistent, which is a prerequisite for achieving settlement balance.

[0072] When monitoring shows a depression in the middle of the superimposed curved subsidence zone where coal mines and bauxite are mined in coordination, it indicates that the horizontal projection distance 130 between the coal mine working face and the bauxite working face is too small, otherwise it is too large. At this time, it is necessary to readjust the relative position of the working face and determine the appropriate horizontal projection distance 130 between the coal mine working face and the bauxite working face, so that the overall shape of the superimposed curved subsidence zone is smooth and regular, thereby achieving the purpose of superimposed balance of rock strata subsidence.

[0073] Beneficial effects:

[0074] The present invention aims at the problems of aggravated rock stratum settlement and difficulty in ground pressure management caused by the superposition of mining disturbances in the coordinated mining of coal and associated minerals, comprehensively considers the spatiotemporal relationship between coal mines and associated minerals, and establishes a coordinated control method for rock stratum deformation dynamic balance of "coordinated mining-deformation induction-settlement balance". The implementation of this technical invention can ensure that the coordinated mining of coal and associated minerals is carried out efficiently and safely. The main advantages of this method are:

[0075] 1. Reduced damage to the surface landform. By optimizing the layout of the working face and arranging the order and time of mineral mining, the antisymmetry of the curved subsidence zone of coal mining and associated mineral mining is used to control the rock stratum settlement to achieve a coordinated balance, reducing the surface subsidence while making the curved subsidence zone more regular, reducing the degree of damage to the surface landform caused by surface subsidence.

[0076] 2. Reduced the difficulty of mine ground pressure management. By inducing deformation and subsidence of the overlying rock strata in the goaf, the settlement of the rock strata in the coordinated mining of coal mines and associated minerals is generally coordinated, reducing the complexity of ground stress distribution, avoiding the emergence of more stress concentration areas, and to a certain extent improving the stability of security coal pillars or ore pillars, reducing the cost of shaft and tunnel maintenance.

[0077] Innovation:

[0078] A method for superimposed balance control of antisymmetric settlement of strata induced by coordinated mining is proposed. Aiming at the problems of aggravated rock settlement and difficult ground pressure management caused by superimposed mining disturbance in the coordinated mining of coal and associated minerals, the working face layout is optimized from three dimensions: the mining height of the working face in space, the relative position of the working face and the advancement direction of the working face. The deformation and settlement of the rock strata are induced. At the same time, the mining sequence and mining time of coal and associated minerals are adjusted in time, thus forming an antisymmetric settlement superimposed control zone in the curved subsidence zone of the coordinated mining of coal and associated minerals. In the subsequent tracking and monitoring of the actual control effect and timely feedback, the control scheme is optimized accordingly, so that the superimposed settlement of the rock strata in the coordinated mining reaches a dynamic balance.

[0079] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meanings understood by persons of ordinary skill in the field to which the invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not necessarily indicate a quantitative limitation. Words such as "include" or "comprises" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0080] The exemplary implementation scheme of the coordinated mining induced rock strata antisymmetric settlement superimposed balance control method proposed in the present invention is described in detail above with reference to the preferred embodiments. However, those skilled in the art will appreciate that, without departing from the concept of the present invention, various modifications and variations can be made to the above-mentioned specific embodiments, and various technical features and structures proposed in the present invention can be combined in various ways without exceeding the protection scope of the present invention, which is determined by the attached claims.

Claims

1. A coordinated mining induced rock stratum antisymmetric settlement superposition balance control method, characterized by: The following steps are involved: S1. Conduct geological exploration: collect hydrogeological information of the mining area through exploration drilling in the coordinated mining area; S2. Determine the movement of rock formations: Based on the above hydrogeological information, analyze and coordinate the movement of rock formations overlying the goaf during mining; Through similar simulation, numerical simulation and field measurement, the movement of overlying rock layers in the goaf during the coordinated mining process is analyzed; S3. Adjust the mining height of the working face: according to the buried depth of the coal seam and the associated minerals, as well as the surface subsidence coefficient during the mining of the coal mine and the associated minerals, adjust the mining height of the working faces of the two; S4. Adjust the relative position of the working face: According to the relationship between the coal seam and the associated mineral deposits, as well as the movement boundary and subsidence of the rock strata during the mining of coal mines and associated minerals, the relative position of the two working faces is reasonably adjusted, and the antisymmetry of the curved subsidence zone is used to control the subsidence of the rock strata to achieve a coordinated balance; S5. Adjust the advancement direction of the working face: According to the relationship between the coal seam and the associated mineral deposits, as well as the shape of the curved subsidence zone formed by the mining of the two, adjust the advancement direction of the coal mine and the associated mineral deposits, and use the antisymmetry of the curved subsidence zone to control the rock stratum settlement to achieve a coordinated balance; S6, adjusting the mining sequence and time: according to the relationship between the coal seam and the associated mineral deposits, and the range of the curved subsidence zone formed by the mining of the two, based on the mining height, relative position and advancement direction of the working face optimized in the above steps S3 to S5, the mining sequence of the two is adjusted accordingly by utilizing the hysteresis of the bending and subsidence of the overlying rock strata in the goaf, and the mining time of the two is reasonably arranged; When the coal mine and bauxite mine working faces advance in the same direction, the two will continue to affect each other during the mining process because the working faces are too close to each other, and will aggravate the subsidence of the rock strata, so the advancing directions of the two are adjusted to face each other; S7. Monitor the actual control effect: monitor the movement of the overlying rock strata in the mining area, and provide timely feedback on the actual control effect for optimization of the control plan.

2. A coordinated mining induced rock strata antisymmetric settlement superimposed balance control method as claimed in claim 1, characterized in that: In step S1, hydrogeological information is collected by drilling. The drilling density is determined according to the complexity of the geology. The drilling depth is not less than the burial depth of the main coal seam and the associated mineral resources. The hydrogeological information includes the stratigraphic position, lithology, structural structure, stratigraphic contact relationship, pore water pressure, and geostress of the detected strata.

3. A coordinated mining induced stratum antisymmetric settlement superimposed balance control method as claimed in claim 2, characterized in that: In step S2, since coal and co-existing bauxite are both solid minerals, the similarity simulation experiment selects a plane similarity simulation with relatively simple operation and relatively intuitive results. Among them, the surface subsidence coefficient is an important parameter for predicting surface movement and deformation in the mining-affected area, and its size is related to the mining method, roof management method, total mining thickness, mining depth and lithology of the overlying strata.

4. A coordinated mining induced stratum antisymmetric settlement superimposed balance control method as claimed in claim 1, characterized in that: In step S4, since the distance between the coal seam and the bauxite layer is constant, the relative position of the coal mine and the bauxite working face is determined by the horizontal projection distance perpendicular to the advancing direction of the two.

5. The coordinated mining induced rock strata antisymmetric settlement superimposed balance control method according to claim 1, characterized in that: In step S6, the adjustment of the mining sequence needs to take into account the mutual influence of coal and associated minerals during the mining process, so as to avoid the serious impact of the prior mining of a certain mineral on the subsequent mining of another mineral, resulting in a waste of resources.

6. A coordinated mining induced stratum antisymmetric settlement superimposed balance control method as claimed in claim 1, characterized in that: In step S7, the monitoring contents include the development range of the curved subsidence zone, the shape of the curved subsidence zone and the subsidence amount of the overburden in the goaf.

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