Hydropower station underground cavern position optimization method

Abstract

The invention provides a hydropower station underground cavern position optimization method, and relates to the technical field of hydropower stations, and the method comprises the steps: screening the potential arrangement position of an underground cavern according to the ground stress, geological conditions and hub arrangement conditions of an engineering area; distribution of the workshop structural surfaces under the potential arrangement positions is analyzed, potential unfavorable blocks and the positions of the potential unfavorable blocks are calculated and analyzed, and the positions comprise the internal position of the hydropower station and the structural surface combination; calculating the distance between the potential arrangement position and the plant control fault; from the aspect of block stability, the stability is determined based on the distribution of plant structural surfaces and potential unfavorable blocks, the anti-seepage difficulty is determined based on the distance with a plant control fault, the stability, the anti-seepage difficulty and hub arrangement conditions are comprehensively considered, and the optimal arrangement position of the underground cavern is screened. By the adoption of the scheme, the optimal selection of the arrangement position of the underground cavern of the hydropower station is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydropower stations, and in particular to a hydropower station underground cavern position optimization method and system. BACKGROUND

[0002] At present, new energy, hydropower, urban construction, national defense safety and many other fields will usher in a new round of engineering construction period, and the development and utilization of underground space resources such as hydropower station underground caverns, carbon dioxide underground storage, nuclear waste underground storage, national defense hangars, underground oil storage, etc. will become more and more common.

[0003] According to different construction needs, the geological environment of the underground cavern is complex, and gradually develops in the direction of deep burial, large span, scale, and high requirements for safety construction. In the construction process of the underground cavern, determining a safe and stable underground cavern construction position is one of the problems that must be focused on in the safety control of the whole life cycle of the engineering building. SUMMARY

[0004] The present application aims to at least solve one of the technical problems in the related art to some extent.

[0005] To this end, the first purpose of the present application is to propose a hydropower station underground cavern position optimization method, which realizes the optimal selection of the layout position of the hydropower station underground cavern.

[0006] The second purpose of the present application is to propose a hydropower station underground cavern position optimization system.

[0007] To achieve the above purpose, the first aspect of the present application proposes a hydropower station underground cavern position optimization method, comprising: according to the engineering area ground stress, geological conditions and hub layout conditions, screening out potential layout positions of the underground cavern; analyzing the distribution of the powerhouse structural surface under the potential layout position, and calculating and analyzing the potential adverse block and the position of the potential adverse block, wherein the position includes the internal position of the hydropower station and the combination of the structural surface; calculating the distance between the potential layout position and the control fault of the plant area; from the perspective of block stability, determining the stability based on the distribution of the powerhouse structural surface and the potential adverse block, determining the anti-seepage difficulty based on the distance from the control fault of the plant area, and comprehensively considering the stability, anti-seepage difficulty and hub layout conditions to screen the optimal layout position of the underground cavern.

[0008] To achieve the above purpose, the second aspect of the present application proposes a hydropower station underground cavern position optimization system, comprising:

[0009] A potential position determination module is configured to screen out potential layout positions of the underground cavern according to the engineering area ground stress, geological conditions and hub layout conditions;

[0010] a potential position analysis module, configured to analyze the distribution of the powerhouse structural plane under a potential arrangement position, and to calculate and analyze potential adverse blocks and positions of the potential adverse blocks, wherein the positions include internal positions of the hydropower station and combinations of structural planes;

[0011] The potential position analysis module is further configured to calculate distances between the potential arrangement position and the control fault of the plant area.

[0012] The potential position evaluation module is configured to determine stability based on the distribution of the powerhouse structural plane and the potential adverse blocks from the perspective of block stability, to determine seepage prevention difficulty based on the distances to the control fault of the plant area, and to comprehensively consider the stability, the seepage prevention difficulty, and the hub arrangement condition to screen the optimal arrangement position of the underground cavern.

[0013] The hydropower station underground cavern position optimization method and system provided in the embodiments of the present application comprehensively consider the stability, the seepage prevention, and the smoothness of arrangement of the underground cavern, and select the most reasonable underground cavern arrangement position.

[0014] Additional aspects and advantages of the present application will be made apparent by the following description and the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0015] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0016] Figure 1 A flowchart of a hydropower station underground cavern position optimization method provided in Embodiment One of the present application;

[0017] Figure 2 A schematic diagram of three arrangement positions of the underground cavern according to the embodiments of the present application;

[0018] Figure 3 A schematic diagram of the cavern position 1 according to the embodiments of the present application;

[0019] Figure 4 A schematic diagram of the cavern position 3 according to the embodiments of the present application;

[0020] Figure 5 A schematic diagram of the cavern position 2 according to the embodiments of the present application;

[0021] Figure 6 A summary of the potential adverse blocks of the cavern position 1 according to the embodiments of the present application Figure 1 ;

[0022] Figure 7 A summary of the potential adverse blocks of the cavern position 1 according to the embodiments of the present application Figure 2 ;

[0023] Figure 8 Summary of potential unfavourable blocks for chamber position 1 of the present embodiment Figure 3 ;

[0024] Figure 9 Summary of potential unfavourable blocks for chamber position 1 of the present embodiment Figure 4 ;

[0025] Figure 10 Summary of potential unfavourable blocks for chamber position 1 of the present embodiment Figure 5 ;

[0026] Figure 11 Summary of potential unfavourable blocks for chamber position 1 of the present embodiment Figure 6 ;

[0027] Figure 12 Summary of potential unfavourable blocks for chamber position 2 of the present embodiment Figure 1 ;

[0028] Figure 13 Summary of potential unfavourable blocks for chamber position 2 of the present embodiment Figure 2 ;

[0029] Figure 14 Summary of potential unfavourable blocks for chamber position 2 of the present embodiment Figure 3 ;

[0030] Figure 15 Summary of potential unfavourable blocks for chamber position 2 of the present embodiment Figure 4 ;

[0031] Figure 16 Summary of potential unfavourable blocks for chamber position 2 of the present embodiment Figure 5 ;

[0032] Figure 17 Summary of potential unfavourable blocks for chamber position 2 of the present embodiment Figure 6 ;

[0033] Figure 18 Summary of potential unfavourable blocks for chamber position 2 of the present embodiment Figure 7 ;

[0034] Figure 19 Summary of potential unfavourable blocks for chamber position 2 of the present embodiment Figure 8 ;

[0035] Figure 20 Summary of potential unfavourable blocks for chamber position 2 of the present embodiment Figure 9 ;

[0036] Figure 21Summary of potential adverse blocks for chamber position 2 of the present application embodiment Figure 10 ;

[0037] Figure 22 Summary of potential adverse blocks for chamber position 2 of the present application embodiment Figure 10 One;

[0038] Figure 23 Summary of potential adverse blocks for chamber position 2 of the present application embodiment Figure 10 Two;

[0039] Figure 24 Summary of potential adverse blocks for chamber position 3 of the present application embodiment Figure 1 ;

[0040] Figure 25 Summary of potential adverse blocks for chamber position 3 of the present application embodiment Figure 2 ;

[0041] Figure 26 Summary of potential adverse blocks for chamber position 3 of the present application embodiment Figure 3 ;

[0042] Figure 27 Summary of potential adverse blocks for chamber position 3 of the present application embodiment Figure 4 ;

[0043] Figure 28 Summary of potential adverse blocks for chamber position 3 of the present application embodiment Figure 5 ;

[0044] Figure 29 Summary of potential adverse blocks for chamber position 3 of the present application embodiment Figure 6 ;

[0045] Figure 30 Summary of potential adverse blocks for chamber position 3 of the present application embodiment Figure 7 ;

[0046] Figure 31 Summary of potential adverse blocks for chamber position 3 of the present application embodiment Figure 8 ;

[0047] Figure 32 Summary of potential adverse blocks for chamber position 3 of the present application embodiment Figure 9 ;

[0048] Figure 33 Summary of potential adverse blocks for chamber position 3 of the present application embodiment Figure 10 ;

[0049] Figure 34 Summary of potential adverse blocks for chamber position 3 of the present application embodimentFigure 10 One;

[0050] Figure 35 Summary of potential adverse blocks for the underground cavern position 3 of the embodiment of the present application Figure 10 Two;

[0051] Figure 36 Summary of potential adverse blocks for the underground cavern position 3 of the embodiment of the present application Figure 10 Three;

[0052] Figure 37 Schematic diagram of the distribution of the powerhouse structural plane for the three arrangement positions of the underground cavern of the embodiment of the present application;

[0053] Figure 38 L 36-2 , J2, J3 combination adverse block schematic diagram;

[0054] Figure 39 Structure schematic diagram of a underground cavern position optimization system for the embodiment of the present application. DETAILED DESCRIPTION

[0055] The embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference signs represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0056] The underground cavern position optimization method and system of the present application are described below with reference to the accompanying drawings.

[0057] Figure 1 Flowchart of a underground cavern position optimization method provided by the embodiment one of the present application.

[0058] As Figure 1 shown, the underground cavern position optimization method includes the following steps:

[0059] Step 101, according to the engineering area ground stress, geological conditions and hub arrangement conditions, the potential arrangement position of the underground cavern is screened out;

[0060] Step 102, the distribution of the powerhouse structural plane under the potential arrangement position is analyzed, and the potential adverse blocks and the position of the potential adverse blocks are calculated and analyzed, wherein the position includes the internal position of the hydropower station and the structural plane combination;

[0061] Step 103, the distance between the potential arrangement position and the control fault of the plant area is calculated;

[0062] Step 104, from the perspective of block stability, determine the stability based on the distribution of the powerhouse structural surface and potential adverse blocks, determine the anti-seepage difficulty based on the distance from the control fault in the plant area, and comprehensively consider the stability, anti-seepage difficulty and hub arrangement conditions to screen the optimal arrangement position of the underground cavern.

[0063] The underground cavern position optimization method of the embodiment of the application comprehensively considers the stability, anti-seepage and arrangement smoothness of the underground cavern, and selects the most reasonable underground cavern arrangement position.

[0064] The embodiment of the application studies the optimal arrangement position of the underground cavern of the G hydropower station, based on the engineering area ground stress and geological conditions, from the perspective of block stability, and carries out the optimization research of the underground cavern arrangement position. By considering the engineering area ground stress, geological conditions and smoothness of hub arrangement, three potential arrangement positions of the underground cavern are proposed. The three specific positions of the underground cavern are shown in Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 , wherein, Figure 2 is a powerhouse three scheme arrangement schematic diagram, Figure 3 is a cavern position 1, Figure 4 is a cavern position 3, Figure 5 is a cavern position 2. In the calculation, according to the block stability theory, the Rockscience Unwedge program is used. The calculation software is an interactive software suitable for three-dimensional block stability analysis of underground engineering excavation, which is used to analyze the stability problem of underground excavation in rock mass with discontinuous structural surface.

[0065] In the calculation, the M-C mode is used. The shear strength calculation of the joint surface shear strength M-C model is shown in the following formula:

[0066]

[0067] wherein τ i is the shear strength on the i surface, c i is the cohesion on the i surface, is the normal stress of the i surface, φ i is the friction angle of the i surface;

[0068] In addition, the structural surface anti-sliding force calculation is shown in the following formula:

[0069] J i =τ i a i cosθ i

[0070] wherein J i is the resistance on the i surface due to shear strength, a iA is the area of the i plane, θ is the angle between the i plane and the sliding plane. i A is the area of the i plane, θ is the angle between the i plane and the sliding plane.

[0071] According to the G Power Station Engineering Zone Geological Survey Report, the structural plane calculation parameters are shown in Table 1.

[0072] Table 1 Recommended Values of Rock Mass Structural Plane Strength Parameters

[0073]

[0074] (1) Stability analysis of block at layout position 1 of underground cavern

[0075] The overall stability of the underground cavern area is good, mainly with Class Ш surrounding rock, and there may be local combined block stability problems, which need to be considered. The main structural planes existing when the cavern is located at layout position 1 include F115, f187, L52-1, L52-2, L52-3, L52-4, L52-5, and L52-6. The occurrence of the structural planes is shown in Table 2. In addition, there are three groups of dominant joint sets in the plant area, and the occurrence of the joint sets is shown in Table 3.

[0076] Table 2 List of Main Faults in Dam Site Area

[0077]

[0078]

[0079]

[0080]

[0081]

[0082]

[0083]

[0084] Table 2 Summary of Dominant Joint Sets in Plant Area

[0085]

[0086] Through calculation and analysis, the potential disadvantageous block of the underground cavern located at layout position 1 is obtained, as shown in Figure 6 、 Figure 7 、 Figure 8 、 Figure 9 、 Figure 10 、 Figure 11 In Figures 6-11 , the first column is the block number, the second column is the three-dimensional diagram of the block, the third column is the plane diagram, and the fourth column is the volume / m 3, the fifth column is the position. From Figures 6-11 it can be seen that the potential unfavorable blocks are mainly located in the main powerhouse area, in which there are two blocks with a volume greater than 10 m, such as block D8 (volume 37.615 m 3 , located near the 4# unit in the factory 00+057, and the structural plane combination J2, J3, L52-5) and D10 (volume 29.939 m 3 , located near the 4# unit in the factory 00+057, and the structural plane combination J3, f187, L52-5). 3 In addition, the calculation shows that under the existing geological conditions, the potential unfavorable blocks in the main transformer room, the tail regulation room and the busbar tunnel are very small, and there are no blocks with a volume greater than 10 m 3 . Among them, the largest block in the main transformer room area has a volume of 9.655 m 3 , which is block D19 (located in the main transformer factory 00+120, in the range of 2# to 3# units, and the structural plane combination J2, J3, L52-5); there is one potential unfavorable block in the busbar tunnel area, which is block D21 (volume 8.796 m 3 , located near the #1 busbar tunnel, and the structural plane combination J1, J3, L147-1); the potential unfavorable blocks in the tail regulation room area are very small, which are not listed here. The above two possible unstable blocks in the main powerhouse area are the objects of attention during construction and operation. Through the analysis of the results of local block search, the block outcrop of underground caverns has the following characteristics: (1) the distribution characteristics of the main powerhouse block. The main powerhouse area is mainly distributed on the side of the 1# unit to the end wall of the auxiliary powerhouse and near the 4# unit, among which the largest key block (number D8, volume 37.615 m 3 ) outcrops in the vault near the 4# unit.

[0087] (2) the distribution characteristics of the main transformer tunnel block. The main transformer tunnel area is mainly distributed near the 2# to 3# units, but most of the blocks are small in volume, and the largest block (number D19, volume 9.655 m 3 ).

[0088] (3) the distribution characteristics of the busbar tunnel block. The potential unfavorable blocks in the busbar tunnel area are only in the 1# and 2# busbar tunnel areas, which are cut by structural plane 147-1 and the dominant joint group.

[0089] Overall, the blocks are mainly outcropped in the top arch and side wall of the main powerhouse, the main transformer tunnel and the busbar tunnel, the tail regulation room has fewer faults and fewer blocks, and the volume of the blocks is small. The outcrop position of the block is roughly consistent with the density of fault distribution.

[0090] (2) Block stability analysis of underground cavern layout position

[0091] When the underground cavern is located at position 3, the existing structural surfaces mainly include F115, f187, L52-1, L52-2, L52-3, L52-4, L52-5, and L52-6, as well as three sets of dominant joint groups. The specific attitudes of the structural surfaces and joint groups are shown in Tables 2 and 3.

[0092] Through calculation and analysis, the potential unfavorable blocks located at position 3 of the underground cavern were identified. Figure 12 , Figure 13 , Figure 14 , Figure 15 , Figure 16 , Figure 17 , Figure 18 , Figure 19 , Figure 20 , Figure 21 , Figure 22 , Figure 23 ,exist Figures 12-23 In the diagram, the first column is the block number, the second column is the 3D view of the block, the third column is the planar view, and the fourth column is the block volume in m³. 3 The fifth column is the position. (By...) Figures 12-23 It is known that the potentially hazardous blocks are mainly located in the main plant area, with some blocks having a volume greater than (or close to) 10m³. 3 There are two blocks in total, such as D6 (volume 2539.97m³). 3 Near Units 1 and 2, structural plane combinations J2, J3, L36-2) and D7 (volume 9.925m³) 3 Near Units 1 and 2, structural plane combinations J2, L52-4, and L36-2. Furthermore, calculations indicate that under the existing geological conditions, the potential unfavorable blocks in the main transformer chamber, tailrace chamber, and busbar tunnel are all very small, with no blocks exceeding 10m³ in volume. 3 The blocks are of various sizes. The largest block in the main transformer room area has a volume of 2.186 m³. 3 The largest potentially unfavorable block in the busbar tunnel area is D12 (located at 00+190 in the main transformer plant; near Unit 1, structural surface combination J1, J3, L52-3); the largest potential unfavorable block volume in the busbar tunnel area is D24 (volume 6.349m³). 3 Located in the #1 busbar tunnel, the structural surface combination is J3, L36-1, L147-1; the potential unfavorable block volume in the tail section area is very small.

[0093] The two potentially unstable blocks in the main plant area mentioned above are the focus of attention during construction and operation. Through analysis of the results of local block searches, the exposed blocks of the underground caverns have the following characteristics:

[0094] (1) Distribution characteristics of the main plant area. The main plant area is mainly distributed near Unit 1, followed by Units 3 and 4. The largest key block (numbered D12, with a volume of 2.186 m³) is located in the vicinity of Unit 1. 3) exposed in the vicinity of 1# unit area vault.

[0095] (2) Main transformer hole block distribution characteristics. Main transformer hole area is mainly distributed in the vicinity of 2# to 3# unit, but most of the block volume is small, the largest block (number D19, volume 9.655m 3 ).

[0096] (3) Busbar hole block distribution characteristics. Potential adverse block in busbar hole area only appears in 1# and 2# busbar hole area, which is cut by structural surface L36-1, L147-1 and dominant joint group.

[0097] Overall, the block is mainly exposed in the top arch and side wall of main powerhouse, main transformer hole and busbar hole, and there are fewer faults in tail regulation room, so the number of cut blocks is small, and the block volume is small. The exposed position of the block is roughly consistent with the intensive degree of fault distribution.

[0098] (3) Block stability analysis of underground cavern layout position 2

[0099] When the underground cavern is located at layout position 2, the main structural surfaces include F115, f187, L52-6, L52-1, L36-3, L52-4, L36-1, [36-2, L52-3, L144-1, f189, L52-5 and L52-2, etc., and three groups of dominant joint groups. The occurrence of structural surface and joint group is shown in Table 2 and Table 3.

[0100] Through calculation and analysis, the potential adverse block of underground cavern located at layout position 2 is obtained, as shown in Figure 24 、 Figure 25 、 Figure 26 、 Figure 27 、 Figure 28 、 Figure 29 、 Figure 30 、 Figure 31 、 Figure 32 、 Figure 33 、 Figure 34 、 Figure 35 、 Figure 36 In Figures 24-36 , the first column is the block number, the second column is the three-dimensional diagram of the block, the third column is the plane diagram, the fourth column is the block volume / m3, and the fifth column is the position. As can be seen from Figures 24-36 , the potential adverse block is mainly located in the main powerhouse area, among which there are 9 blocks with block volume greater than 10m, such as D8 (volume 37.484m 3 , main factory 00+105, near 3# unit, structural surface combination J2, J3, L52-5) and D20 (volume 139.966m 3The main plant is located at 00+155, within the area of ​​units 1 to 2 (structural surface combinations L52-3, L148-1, and 143-3). Furthermore, calculations indicate that under the existing geological conditions, the potential unfavorable blocks in the main transformer room and busbar tunnel are very small, with no blocks exceeding 10m³ in volume. 3 The blocks are of various sizes. The largest block in the main transformer room area has a volume of 1.540 m³. 3 The largest potentially unfavorable block in the busbar tunnel area is D22 (located at 00+170 of the main transformer, near Unit 1, with structural surfaces J1, J3, and L43-1); the largest potential unfavorable block in the busbar tunnel area is D27 (volume 0.491m³). 3 Located in the #1 busbar tunnel, with structural surface combination J2, J3, L52-5; the potential unfavorable block volume in the tail section area is very small.

[0101] The nine potentially unstable blocks in the main plant area are the focus of attention during construction and operation. Through analysis of the results of local block searches, the exposed blocks of the underground caverns have the following characteristics:

[0102] (1) Distribution characteristics of the main plant area. The main plant area is mainly distributed near Units 1 to 4, with the largest key block (numbered D20, volume 139.966 m³) being the largest. 3 The arch is exposed in the area near Units 1 and 2.

[0103] (2) Distribution characteristics of the main transformer tunnel blocks. The main transformer tunnel area is mainly distributed near Units 3 and 4, followed by Unit 1. However, most of the blocks are relatively small in volume, with the largest block (numbered D22, volume 1.540 m³) being 1.540 m³. 3 ).

[0104] (3) Distribution characteristics of busbar tunnel blocks. Potentially unfavorable blocks only appear in the No. 1 busbar tunnel area, which are cut by the structural plane L52-5 and the dominant joint group.

[0105] Overall, the blocks are mainly exposed in the roof arches and sidewalls of the main powerhouse and main transformer tunnel. There are fewer faults in the busbar tunnel and tail section, so the number of blocks cut is smaller, and the blocks are all relatively small in size. The location of the block exposure roughly corresponds to the density of the fault distribution.

[0106] (4) Comparison and analysis of the location of underground caverns

[0107] First, the distribution of the plant structure surfaces at the three locations of the aforementioned underground cavern was compared and analyzed. The distribution of the plant structure surfaces at the three locations is shown in the figure. Figure 37 , Figure 37 (a), (b), and (c) correspond to underground chambers 1, 3, and 2, respectively. Figure 37It can be seen that under the layout position 1 of the underground chamber, the powerhouse is distributed with 7 structural planes, which are f187, L52-2, L52-4, L52-5, L52-6, L147-1 and L148-1; under the layout position 3 of the underground chamber, the powerhouse is also distributed with 7 structural planes, which are f187, f189, L144-1, L36-1, L36-2, L36-3 and L52-4; under the layout position 2 of the underground chamber, the powerhouse is mainly distributed with 8 structural planes, which are f87, L52-2, L52-3, L52-5, L36-1, L43-2, L147-1 and L48-1. Overall, under the layout positions 1 and 2 of the underground chamber, the structural planes of the powerhouse are relatively dispersed, while under the layout position 3 of the underground chamber, the structural planes are relatively concentrated on the side of the auxiliary powerhouse, that is, the concentrated distribution of the structural planes is more likely to form an unfavorable block.

[0108] Then, the stability of the potential unfavorable block under the three positions of the underground chamber is compared and analyzed. Under the layout position 1 of the underground chamber, the number of potential unfavorable blocks in the underground chamber area is 22, and the maximum volume of the typical potential unfavorable block in the powerhouse area is 37.615m 3 ; under the layout position 3 of the underground chamber, the number of typical potential unfavorable blocks in the underground chamber area is 28, and the maximum volume of the potential unfavorable block in the powerhouse area is 2539.97m 3 ; under the layout position 2 of the underground chamber, the number of typical potential unfavorable blocks in the underground chamber area is 27, and the maximum volume of the potential unfavorable block in the powerhouse area is 139.966m 3 . As can be seen from the above, under the three layout schemes, the number and volume of potential unfavorable blocks under the layout position 1 of the underground chamber are the smallest, the number and volume of potential unfavorable blocks under the layout position 2 of the underground chamber are moderate, and the number and volume of potential unfavorable blocks under the layout position 3 of the underground chamber are the largest. It should be noted that in the layout position 3 of the underground chamber, affected by the moderately dipping fault L36-2 and the dominant joint groups J2 and J3, there are specific blocks in the crown of the chamber, and the typical blocks are as follows Figure 38 , in which L36-2 is combined with the moderately steep fault to form a block embedded in the crown of the chamber by about 10m, with a large volume, and the reinforcement design is difficult.

[0109] Finally, the relationship between the three positions of the underground chamber and the control fault F 115 of the plant area is compared and analyzed. As can be seen from the above, Figure 2 the distance between the layout position 1 of the underground chamber and the fault F 115 is the shortest, with a minimum distance of 67m; the distance between the layout position 2 of the underground chamber and the fault F115 is the farthest, which is 107m; and the distance between the layout position 3 of the underground chamber and the fault F 115 is moderate, which is 86m. From the perspective of seepage prevention and safety of surrounding rock, the closer to the fault F115, the more difficult the seepage prevention and safety of the underground chamber.

[0110] Considering the stability of the underground cavern, the anti-seepage and the smoothness of the layout comprehensively, the underground cavern layout position 2 can be considered as the most reasonable position.

[0111] In order to realize the above-mentioned embodiment, the application further provides a hydropower station underground cavern position optimization system.

[0112] Figure 39 A structural schematic diagram of a hydropower station underground cavern position optimization system provided by the embodiment of the application.

[0113] As Figure 39 shown, the hydropower station underground cavern position optimization system comprises:

[0114] A potential position determination module configured to filter out potential layout positions of the underground cavern according to the engineering area ground stress, the geological condition and the hub layout condition;

[0115] A potential position analysis module configured to analyze the distribution of the powerhouse structural surface under the potential layout positions, and calculate and analyze the potential adverse block and the position of the potential adverse block, wherein the position comprises an internal position of the hydropower station and a structural surface combination;

[0116] The potential position analysis module is further configured to calculate the distance between the potential layout position and the control fault of the plant area;

[0117] A potential position evaluation module configured to determine the stability based on the distribution of the powerhouse structural surface and the potential adverse block from the perspective of the block stability, determine the anti-seepage difficulty based on the distance to the control fault of the plant area, and comprehensively consider the stability, the anti-seepage difficulty and the hub layout condition to filter out the optimal layout position of the underground cavern.

[0118] Further, in the embodiment of the application, the structural surface comprises a joint surface, and the calculation and analysis of the potential adverse block and the position of the potential adverse block comprises:

[0119] The M-C model is used to calculate and analyze the potential adverse block, and the calculation and analysis process comprises:

[0120] The shear strength of the joint surface shear strength M-C model is set as:

[0121]

[0122] Wherein, τ i is the shear strength on the i surface, c i is the cohesion on the i surface, σ ni is the normal stress of the i surface, and φ i is the friction angle of the i surface;

[0123] The calculation formula of the structural surface anti-sliding force is set as:

[0124] J i = τ i a i cos θ i

[0125] wherein, J i is the resistance on the i surface due to shear strength, a i is the area of the i surface, θ i is the angle between the i surface and the sliding surface;

[0126] The potential adverse block resistance against sliding is analyzed based on the joint surface shear strength.

[0127] Specifically, in the embodiment of the present application, the stability is determined based on the distribution of the powerhouse structural surface and the potential adverse block from the perspective of block stability, including:

[0128] The stability is calculated according to the dispersion of the powerhouse structural surface, the number and volume of the potential adverse block, wherein the dispersion of the powerhouse structural surface, the number and volume of the potential adverse block are negatively correlated with the stability, and the dispersion of the powerhouse structural surface is determined by the generation and extension direction, extension length of the structural surface in the numerical simulation process.

[0129] Further, in the embodiment of the present application, the anti-seepage difficulty is determined based on the distance from the control fault of the plant area, including:

[0130] The anti-seepage difficulty is calculated based on the distance from the control fault of the plant area, wherein the anti-seepage difficulty is negatively correlated with the distance from the control fault of the plant area.

[0131] Specifically, in the embodiment of the present application, the optimal arrangement position of the underground cavern is screened by comprehensively considering the stability, the anti-seepage difficulty and the hub arrangement condition, including:

[0132] The candidate score is calculated based on the stability, the anti-seepage difficulty and the hub arrangement condition, and the potential arrangement position with the highest candidate score is screened as the optimal arrangement position of the underground cavern.

[0133] It should be noted that the aforementioned explanation and description of the embodiment of the method for optimizing the position of the underground cavern of the hydropower station also applies to the system for optimizing the position of the underground cavern of the hydropower station, which will not be described here.

[0134] In the description of the application, the description of the terms "one embodiment", "some embodiments", "an example", "a specific example" or "some examples" etc. means that the particular feature, structure, material or characteristic being described is included in at least one embodiment or example of the application. The illustrative appearance of the above terms in various places in the specification are not necessarily referring to the same embodiment or example. Moreover, the particular features, structures, materials or characteristics can be combined in any suitable manner in one or more embodiments or examples. Furthermore, the description of different embodiments or examples of the application and the characteristics of different embodiments or examples can be combined and combined in any suitable manner, without mutually exclusive, by a person skilled in the art.

[0135] In addition, the terms "first", "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0136] Any process or method descriptions or descriptions of the flow diagrams in the flow charts described herein or otherwise described herein can be understood as representing code modules, segments, or portions of code that include one or more executable instructions for implementing the specified logical functions or processes, and the preferred embodiments of the application include additional implementation involving other processes or methods as will occur to those skilled in the art. The various embodiments of the application can be implemented in hardware, software, or a combination thereof.

[0137] The logic and / or steps represented in flow diagrams or otherwise described herein, for example, can be considered as a sequence of instructions to implement logic functions, and can be embodied in any computer-readable medium for use by an instruction execution system, apparatus, or device, such as a computer-based system, processor- containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. In the context of this specification, a "computer-readable medium" can be any means that can contain, store, communicate, propagate or transport the program for use by or in connection with the instruction execution system, apparatus, or device. The computer-readable medium can be a machine-readable storage device (e.g., magnetic, optical or other) a machine-readable storage diskette (e.g., floppy disk, optical disk, CD- ROM, etc.), a machine- readable storage card (e.g., PCMCIA card, etc.), a machine-readable storage tape (e.g., magnetic tape, optical tape, etc.), a machine-readable storage medium (e.g., RAM, ROM, etc.), a machine-readable signal (e.g., electrical, optical, etc.), a machine-readable medium (e.g., carrier wave, etc.) or any other suitable medium or means of embodying the program. More specific examples (a non-exhaustive list) of the computer-readable medium include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a RAM, a ROM, an EPROM, a FLASH memory card, an optical fiber, and a portable compact disc read-only memory (CD-ROM). Additionally, the computer-readable medium can be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, for example, via optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and stored in a computer memory.

[0138] It should be understood that aspects of the application can be implemented in hardware, software, firmware or combinations thereof. In the above embodiments, various steps or methods can be implemented in software or firmware that is stored in memory and executed by a suitable instruction execution system. As such, in some embodiments, the steps or methods can be implemented in hardware such as a special purpose computer, a programmed microprocessor or microcontroller, a microprocessor-based or a microcontroller-based application-specific integrated circuit, a peripheral integrated circuit element, a digital signal processor, a highly-parallelized architecture or other similar or well-known computing devices. In other embodiments, the steps or methods can be implemented in software that is stored in a memory and executed on a suitable instruction execution system. In other embodiments, the steps or methods can be implemented in a combination of both software and hardware.

[0139] Those of skill in the art would understand that information and signals can be represented using any of a variety of technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that can be referenced throughout the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0140] In addition, each of the functional units in the various embodiments of the present application can be integrated in one processing module, or each of the units can be physically present separately, or two or more units can be integrated in one module. The integrated module can be implemented in the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it can also be stored in a computer readable storage medium.

[0141] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method for optimal siting of a hydropower underground cavern, characterized in that, The method comprises the steps of: According to the ground stress, geological conditions and hub layout conditions of the engineering area, potential layout positions of the underground cavern are screened out; The distribution of the powerhouse structural surface under the potential layout position is analyzed, and potential adverse blocks and the positions of the potential adverse blocks are calculated and analyzed, wherein the positions include the internal position of the hydropower station and the structural surface combination; The distance between the potential layout position and the control fault of the powerhouse is calculated; From the perspective of block stability, the stability is determined based on the distribution of the powerhouse structural surface and the potential adverse blocks, the anti-seepage difficulty is determined based on the distance to the control fault of the powerhouse, and the optimal layout position of the underground cavern is screened out by comprehensively considering the stability, the anti-seepage difficulty and the hub layout conditions.

2. The method of claim 1, wherein, The structural surface comprises joint surfaces, and the calculation and analysis of the potential adverse blocks and the positions of the potential adverse blocks comprise: The potential adverse blocks are calculated and analyzed by using the M-C model, and the calculation and analysis process comprises: The shear strength of the joint surface shear strength M-C model is set as: where τ i is the shear strength on the i plane, c i is the cohesion on the i plane, is the normal stress on the i plane, φ i is the friction angle on the i plane; The calculation formula of the structural surface anti-sliding force is set as: J i = τ i a i cos θ i wherein J i is the resistance due to the shear strength on the i surface, a i is the area of the i surface, θ i is the angle between the i surface and the sliding surface; The anti-sliding force of the potential adverse blocks is analyzed based on the joint surface shear strength.

3. The method of claim 1, wherein, From the perspective of block stability, the stability is determined based on the distribution of the powerhouse structural surface and the potential adverse blocks, and comprises: The stability is calculated according to the dispersion degree of the powerhouse structural surface, the number and volume of the potential adverse blocks, wherein the dispersion degree of the powerhouse structural surface, the number and volume of the potential adverse blocks are negatively correlated with the stability, and the dispersion degree of the powerhouse structural surface is determined by the generation and extension direction, extension length of the structural surface in the numerical simulation process.

4. The method of claim 1, wherein, The anti-seepage difficulty is determined based on the distance to the control fault of the powerhouse, and comprises: The anti-seepage difficulty is calculated based on the distance to the control fault of the powerhouse, wherein the anti-seepage difficulty is negatively correlated with the distance to the control fault of the powerhouse.

5. The method of claim 1, wherein, The optimal layout position of the underground cavern is screened out by comprehensively considering the stability, the anti-seepage difficulty and the hub layout conditions, and comprises: The candidate score is calculated based on the stability, the anti-seepage difficulty and the hub layout conditions, and the potential layout position with the highest candidate score is screened out as the optimal layout position of the underground cavern.

6. A system for optimizing the location of underground caverns in a hydropower station, characterized in that, The method comprises the steps of: The potential position determination module is used to screen out potential layout positions of the underground cavern according to the ground stress, geological conditions and hub layout conditions of the engineering area; The potential position analysis module is used to analyze the distribution of the powerhouse structural surface under the potential layout position, and calculate and analyze potential adverse blocks and the positions of the potential adverse blocks, wherein the positions include the internal position of the hydropower station and the structural surface combination; The potential position analysis module is also used to calculate the distance between the potential layout position and the control fault of the powerhouse; The potential position evaluation module is used to determine the stability from the perspective of block stability, based on the distribution of the powerhouse structural surface and the potential adverse blocks, determine the anti-seepage difficulty based on the distance to the control fault of the powerhouse, and screen out the optimal layout position of the underground cavern by comprehensively considering the stability, the anti-seepage difficulty and the hub layout conditions.

7. The system of claim 6, wherein, The structural surface comprises joint surfaces, and the calculation and analysis of the potential adverse blocks and the positions of the potential adverse blocks comprise: The potential adverse blocks are calculated and analyzed by using the M-C model, and the calculation and analysis process comprises: The shear strength of the joint surface shear strength M-C model is set as: where τ i is the shear strength on the i plane, c i is the cohesion on the i plane, is the normal stress on the i plane, φ i is the friction angle on the i plane; The calculation formula of the structural surface anti-sliding force is set as: J i = τ i a i cos θ i wherein J i is the resistance due to the shear strength on the i surface, a i is the area of the i surface, θ i is the angle between the i surface and the sliding surface; The potential unfavorable block anti-sliding force is analyzed based on the joint surface shear strength.

8. The system of claim 6, wherein, From the perspective of block stability, the stability is determined based on the distribution of the powerhouse structural surface and the potential unfavorable block, and the stability is calculated according to the dispersion of the powerhouse structural surface, the number and volume of the potential unfavorable block, wherein the dispersion of the powerhouse structural surface, the number and volume of the potential unfavorable block are negatively correlated with the stability, and the dispersion of the powerhouse structural surface is determined by the generation and extension direction and length of the structural surface in the numerical simulation process. The anti-seepage difficulty is determined based on the distance from the control fault of the factory area, and the anti-seepage difficulty is calculated based on the distance from the control fault of the factory area, wherein the anti-seepage difficulty is negatively correlated with the distance from the control fault of the factory area.

9. The system of claim 6, wherein, The optimal layout position of the underground cavern is screened by comprehensively considering the stability, the anti-seepage difficulty and the hub layout condition, and the candidate score is calculated based on the stability, the anti-seepage difficulty and the hub layout condition, and the potential layout position with the highest candidate score is screened as the optimal layout position of the underground cavern. ​ 10. The system of claim 6, wherein, ​ ​

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