Self-adaptive sealing system of compressed air energy storage chamber and construction method and design method of self-adaptive sealing system

Abstract

The invention relates to the technical field of compressed air energy storage, in particular to a self-adaptive sealing system of a compressed air energy storage chamber and a construction method and a design method of the self-adaptive sealing system of the compressed air energy storage chamber. The inner side face of the sealing steel plate is provided with a kerf extending in the longitudinal direction and a telescopic connector stretching across the kerf, the depth of the kerf is smaller than the thickness of the sealing steel plate, and the two ends of the telescopic connector stretch to the two sides of the kerf respectively and are connected with the sealing steel plate. When the deformation amount is small, surrounding rock is assisted by the ring-forming sealing steel plate for bearing together; when the deformation amount is large, the kerfs are opened and cooperate with the telescopic joint to work, and annular deformation is released, so that the sealing steel plate is in an elastic state, rigidity and flexibility self-adaption of a sealing system can be achieved according to different surrounding rock deformation conditions, and the overall safety and long-term reliability of the sealing system are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of compressed air energy storage, in particular to a self-adaptive sealing system of a compressed air energy storage cavern, and a construction method and design method thereof. BACKGROUND

[0002] The compressed air energy storage (CAES) underground gas storage gradually becomes a hot spot in the field of energy. The compressed air energy storage cavern generally adopts a sealed steel lining formed by assembling and welding steel plates in blocks as a sealing system. In the normal operation process of the CAES power station, under the coupling action of temperature and high internal pressure, the sealing system of the gas storage cavern will have a large circumferential strain. When the circumferential strain exceeds the elastic strain of the sealing material, fatigue failure is likely to occur, causing gas leakage risk. In order to reduce the circumferential strain of the sealing steel plate, expansion joints are generally added in the circumferential direction to improve the deformation capacity of the whole ring steel plate through the deformation of the joint part. The existing expansion joint generally uses a steel plate that can expand and contract, but the sealing system connecting adjacent sealing steel plates by using the expansion joint has the following technical problems: (1) after the expansion joint is set, the overall stiffness of the sealing steel plate is weak, and the self-stability is poor; (2) the expansion joint requires high assembly precision, and the construction difficulty is large; (3) the concrete filling behind the sealing steel plate generally uses end pouring, which is difficult to compact and has high safety risk; (4) the sealing steel plate mainly plays a sealing role, and the internal pressure bearing capacity is weak, and the role of steel is not fully played. SUMMARY

[0003] The present application aims to provide a self-adaptive sealing system of a compressed air energy storage cavern, and a construction method and design method thereof, which can at least solve some of the defects in the prior art.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is a self-adaptive sealing system of a compressed air energy storage cavern, comprising a sealed steel lining, the sealed steel lining is formed by splicing a plurality of sealing steel plates in the circumferential and longitudinal directions, a longitudinal extending cut joint is arranged on the inner side of the sealing steel plate, and an expansion joint across the cut joint is arranged on the inner side of the sealing steel plate, the depth of the cut joint is less than the thickness of the sealing steel plate, and the two ends of the expansion joint respectively extend to the two sides of the cut joint and are connected with the sealing steel plate.

[0005] As one of the implementation manners, the expansion joint comprises an expansion steel plate, a deformation layer and a pad layer, the two ends of the expansion steel plate respectively extend to the two sides of the cut joint and are connected with the sealing steel plate, the deformation layer is arranged on the inner side of the expansion steel plate facing the sealing steel plate, and the space enclosed by the deformation layer is filled with a pad layer.

[0006] As one of the implementation manners, the inside of the deformation layer is provided with a longitudinal extending hole.

[0007] As one of the embodiments, the sealing steel plate is provided with a grouting hole for grouting behind the sealing steel lining, and an anchor rod is arranged in the grouting hole, and the end of the anchor rod is fixed to the sealing steel plate through a backing plate.

[0008] The application further provides a construction method of the adaptive sealing system, comprising the following steps:

[0009] 1) Preparing the sealing steel plate in a factory, and marking a cutting seam line on the inner side of the sealing steel plate;

[0010] 2) Assembling the sealing steel plates into a ring in a chamber;

[0011] 3) Cutting a cutting seam on the inner side of the sealing steel plate along the marked cutting seam line;

[0012] 4) Constructing the expansion joint.

[0013] As one of the embodiments, in step 4), the construction of the expansion joint comprises the following steps: first, fixing a deformation layer on the expansion steel plate, then placing the two ends of the expansion steel plate on the two sides of the cutting seam and connecting the expansion steel plate with the sealing steel plate, and then filling the space formed by the deformation layer and the sealing steel plate with mortar to form a backing layer.

[0014] As one of the embodiments, in step 1), the grouting hole is formed on the sealing steel plate when the sealing steel plate is prepared; in step 2), the grouting hole is used to fill the space behind the sealing steel lining to form a filling layer; and between steps 3) and 4), the following steps are further included: setting an anchor rod at the grouting hole, and grouting the anchor rod hole, and fixing the end of the anchor rod to the sealing steel plate through a backing plate.

[0015] The application further provides a design method of the adaptive sealing system, comprising the following steps:

[0016] S1, collecting information of the chamber;

[0017] S2, determining the ring compression amount L of the lining-sealing system of the chamber x ;

[0018] S3, determining the number n of expansion joints according to the surrounding rock condition, the ring compression amount L x , the number of blocks of the sealing steel plate, calculating the design elongation u0 of a single expansion joint, and designing the shape and geometric size of the expansion joint;

[0019] S4, preliminarily designing the thickness h0 of the cutting seam and the parameters of the expansion joint, establishing a calculation model of the expansion joint, and calculating the overall deformation modulus E j of the expansion joint and the opening deformation amount U of the expansion joint when the ring tensile stress P is 0.5f.0.5f f is the yield strength of the sealing steel plate;

[0020] S5, judging whether the overall deformation modulus E of the expansion joint j , the design elongation u0 of the single expansion joint and the maximum mises stress σ of the expansion joint part meet the following conditions respectively:

[0021] ;

[0022] ;

[0023] ;

[0024] Wherein, k1 is the stiffness weakening coefficient, k2 is the allowable deformation amplification coefficient, E t is the deformation modulus of the sealing steel plate, and ψ is the weld coefficient;

[0025] If the above conditions are met, the design is completed; if at least one condition is not met, return to step S4 to adjust the thickness h0 of the cut seam and the parameters of the expansion joint.

[0026] As one of the embodiments, in step S4, the parameters of the expansion joint include the thickness t0 of the expansion steel plate and the deformation modulus E0 of the deformation layer; the method for calculating the overall deformation modulus E j and the expansion joint opening deformation amount U 0.5f under the circumferential tensile stress P=0.5f is as follows:

[0027] The model boundary conditions and loads are applied to the calculation model, the opening deformation amount U of the expansion joint under different circumferential tensile stresses P is extracted, and the P-U curve is drawn;

[0028] According to the P-U curve, the overall deformation modulus E j of the expansion joint is calculated, and the calculation formula is as follows: Wherein, L is the joint width, is the circumferential stress change value on both sides of the expansion joint, is the opening deformation change value on both sides of the expansion joint;

[0029] According to the P-U curve, the opening deformation amount U 0.5f of the expansion joint under P=0.5f is calculated, and f is the yield strength of the sealing steel plate.

[0030] As one of the embodiments, in step S2, the circumferential yielding amount L x of the lining layer-sealing system of the chamber is determined, including:

[0031] The maximum circumferential strain of the surrounding rock-lining layer-sealing system in the whole life cycle under the cyclic loading and unloading action is calculated ;

[0032] According to engineering characteristics, the allowable strain value of the lining layer-sealing system is determined ;

[0033] Comparison With , if , L x is 0; if , L x The calculation formula is: .

[0034] Compared with the prior art, the present application has the following beneficial effects:

[0035] (1) When the deformation amount is small, the present application assists the surrounding rock to bear by the ring sealing steel plate; when the deformation amount is large, the cut joint is opened, the expansion joint works, and the ring deformation is released, so that the sealing steel plate is in an elastic state, the rigidity and flexibility of the sealing system can be self-adapted according to different surrounding rock deformation conditions, the overall safety and long-term reliability of the sealing system are improved;

[0036] (2) The present application reserves a grouting hole on the sealing steel plate, fills the filling layer between the lining layer and the sealing steel lining by using the grouting hole, can improve the compactness of the filling layer behind the sealing steel lining; after the filling layer is grouted, the grouting hole is used as an anchor rod hole, an anchor rod is arranged at the grouting hole, the sealing steel plate and the surrounding rock are anchored by using the anchor rod, the overall rigidity of the sealing system is improved, and the safety of the sealing steel plate under the exhaust maintenance working condition is improved. BRIEF DESCRIPTION OF DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0038] Figure 1 The structural schematic diagram of the self-adaptive sealing system of the compressed air energy storage chamber provided by the embodiments of the present application;

[0039] Figure 2 The structural schematic diagram of the expansion joint provided by the embodiments of the present application;

[0040] Figure 3 The schematic diagram of the sealing steel plate provided by the embodiments of the present application;

[0041] Figure 4Structure schematic diagram of telescopic steel plate provided by the embodiment of the present application, (a) corrugated shape, (b) herringbone shape, (c) several character shape, (d) semicircular shape, (e) rectangular shape, (f) triangular shape;

[0042] Figure 5 Rear filling schematic diagram of grouting hole reserved for the embodiment of the present application;

[0043] Figure 6 Design flow chart of self-adaptive sealing system provided by the embodiment of the present application;

[0044] Figure 7 Computational model diagram of telescopic joint provided by the embodiment of the present application;

[0045] In the figure: 1, sealing steel lining; 11, sealing steel plate; 12, cut seam; 13, grouting hole; 14, cut seam line; 2, telescopic joint; 21, telescopic steel plate; 22, deformation layer; 23, cushion layer; 24, hole; 3, anchor rod; 4, backing plate; 5, filling layer; 6, lining layer; 7, surrounding rock; 8, telescopic joint distribution baseline; 9, sealing steel plate block baseline. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0047] In the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0048] The terms "first", "second" are only 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 one or more of the features; in the description of the present application, unless otherwise specified, the meaning of "multiple" is two or more.

[0049] As Figures 1-2As shown, the embodiment provides a self-adaptive sealing system of compressed air energy storage chamber, which comprises a sealing steel lining 1, the sealing steel lining 1 is spliced along the circumferential direction and the longitudinal direction by a plurality of sealing steel plates 11, the inner side of the sealing steel plate 11 is provided with a longitudinal extending cut seam 12 and a expansion joint 2 across the cut seam 12, the depth of the cut seam 12 is less than the thickness of the sealing steel plate 11, and the two ends of the expansion joint 2 respectively extend to the two sides of the cut seam 12 and are connected with the sealing steel plate 11. When the deformation amount is small, the cut seam 12 is not opened, the circumferential restraint force is provided by the ring-shaped sealing steel plate 11 to assist the surrounding rock 7 to bear together; when the deformation amount is large and reaches the design threshold, the cut seam 12 is opened, the expansion joint 2 works together, and the circumferential deformation is released, so that the sealing steel plate 11 is in an elastic state, and the rigidity and flexibility of the sealing system can be adapted according to the different deformation conditions of the surrounding rock 7, thereby improving the overall safety and long-term reliability of the sealing system.

[0050] In the embodiment, each ring of the sealing steel lining 1 is spliced and welded along the circumferential direction by a plurality of sealing steel plates 11, and at least one longitudinal extending cut seam 12 can be provided on each sealing steel plate 11, and a longitudinal extending expansion joint 2 is provided at each cut seam 12.

[0051] In some embodiments, the expansion joint 2 comprises an expansion steel plate 21, a deformation layer 22 and a pad layer 23, the two ends of the expansion steel plate 21 respectively extend to the two sides of the cut seam 12 and are connected with the sealing steel plate 11, the deformation layer 22 is arranged on the inner side of the expansion steel plate 21 facing the sealing steel plate 11, and the space enclosed by the deformation layer 22 is filled with the pad layer 23. The expansion steel plate 21 can be deformed, mainly playing the role of sealing and expansion deformation; the deformation layer 22 has a lower elastic modulus and a higher deformation capacity, and can absorb and dissipate most of the capacity by its own deformation under stress, thereby reducing the stress transmitted to the expansion steel plate 21; the pad layer 23 has a certain stiffness and good compactness, ensuring uniform force transmission and eliminating local stress concentration.

[0052] Further, the expansion steel plate 21 is arched in the middle in the width direction, and the arching direction is away from the sealing steel plate 11. By arching the middle of the expansion steel plate 21 away from the sealing steel plate 11, a deformation space is provided for the deformation of the expansion steel plate 21. Preferably, the cross section of the expansion steel plate 21 is any one of corrugated, semicircular, rectangular, herringbone, few, triangular and the like, as shown in Figure 4 Further, the expansion steel plate 21 is a symmetrical structure, the symmetry plane of the expansion steel plate 21 coincides with the center plane of the cut seam 12, so that the expansion steel plate 21 can be symmetrically deformed to the two sides of the cut seam 12, effectively avoiding additional stress or structural imbalance caused by asymmetric deformation.

[0053] In some embodiments, the deformable layer 22 has longitudinally extending holes 24 inside. By providing longitudinally extending holes 24 inside the deformable layer 22, the compressive deformation capacity and energy dissipation efficiency of the deformable layer 22 can be further improved. Preferably, a plurality of holes 24 are provided in the middle of the deformable layer 22, and the plurality of holes 24 are arranged at intervals along the contour of the deformable layer 22.

[0054] In this embodiment, the deformable layer 22 can be made of a material with a low elastic modulus and large deformation, specifically a rubber-like material; the padding layer 23 can be made of a filling material with a certain rigidity, specifically cement mortar, which has good injectability to ensure dense filling and effective stress transfer.

[0055] Furthermore, the deformable layer 22 is adhered and fixed to the inner side of the telescopic steel plate 21 facing the sealing steel plate 11, and both ends of the deformable layer 22 extend to the inner side of the sealing steel plate 11 on both sides of the cut 12.

[0056] In some embodiments, the sealing steel plate 11 is provided with grouting holes 13 for injecting grout into the back of the sealing steel liner 1. Anchor rods 3 are installed in the grouting holes 13, and the ends of the anchor rods 3 are fixed to the sealing steel plate 11 by means of pads 4 and nuts. By pre-reserving grouting holes 13 on the sealing steel plate 11, such as... Figure 5 As shown, the filling layer 5 between the lining layer 6 and the sealing steel lining 1 is injected through the grouting hole 13, which can improve the density of the filling layer 5 behind the sealing steel lining 1. After the filling layer 5 is grouted, the grouting hole 13 is also used as an anchor bolt hole. Anchor bolts 3 are installed at the grouting hole 13, and the sealing steel plate 11 is anchored to the surrounding rock 7 using the anchor bolts 3. This can improve the overall rigidity of the sealing system, thereby improving the safety of the sealing steel plate 11 under exhaust and maintenance conditions.

[0057] Preferably, the grouting hole 13 is located at the cut 12. For example... Figure 3 As shown, each slit 12 of each sealing steel plate 11 has at least one grouting hole 13. When multiple grouting holes 13 are provided on each slit 12, the multiple grouting holes 13 are arranged at intervals along the longitudinal direction. Since the grouting holes 13 are located at the slit 12, anchor rods 3 will be installed at the grouting holes 13 later. Therefore, the anchor rods 3 are also fixed at the slit 12, which can improve the rigidity and stability of the slit 12.

[0058] This embodiment also provides a construction method for the adaptive sealing system described in any one of the above claims, comprising the following steps:

[0059] 1) Prefabricate the sealing steel plate 11 in the factory and mark the cut line 14 on the inner side of the sealing steel plate 11;

[0060] 2) Assembling the sealing steel plates 11 into rings in the chamber;

[0061] 3) Cutting the slits 12 on the inner side of the sealing steel plates 11 along the marked slit lines 14;

[0062] 4) Carrying out the construction of the expansion joint 2.

[0063] The present embodiment can perform steps 3) and 4) once every one or two rings are assembled in step 2), i.e., cutting the slits 12 on the corresponding assembled rings of the sealing steel plates 11 and constructing the expansion joint 2. By assembling the sealing steel plates 11 into rings first and then cutting the slits 12 on the inner side of the assembled rings of the sealing steel plates 11, the overall rigidity of the sealing steel plates 11 during the assembly stage is ensured, effectively avoiding problems such as lifting deformation and welding stress concentration caused by pre-cutting.

[0064] Further, in step 4), the construction of the expansion joint 2 includes: first, fixing the deformation layer 22 on the expansion steel plate 21, then placing the two ends of the expansion steel plate 21 on both sides of the slits 12 and connecting them with the sealing steel plates 11, and then filling the space formed by the deformation layer 22 and the sealing steel plates 11 with mortar to form the cushion layer 23. The deformation layer 22 can be a rubber plate with a pre-cut longitudinal hole 24, which can be fixed on the inner side of the expansion steel plate 21 by pasting; the two ends of the expansion steel plate 21 in the width direction can be connected with the sealing steel plates 11 by welding, and the center of the expansion joint 2 is ensured to be consistent with the axis of the slit 12; the cushion layer 23 can be formed by filling mortar into the space formed by the deformation layer 22 and the sealing steel plates 11 through two-end pouring.

[0065] Further, in step 1), when the sealing steel plate 11 is prefabricated, a grouting hole 13 is formed on the sealing steel plate 11; in step 2), after the sealing steel lining 1 is formed, the back of the sealing steel lining 1 is grouted through the grouting hole 13 to form a filling layer 5; between steps 3) and 4), the following steps are further included: setting an anchor rod 3 at the grouting hole 13, and performing anchor rod hole grouting, and fixing the end of the anchor rod 3 to the sealing steel plate 11 through a washer 4 and a nut. By filling the filling layer 5 between the lining layer 6 and the sealing steel lining 1 through the grouting hole 13 on the sealing steel plate 11, the compactness of the filling layer 5 behind the sealing steel lining 1 can be improved; then the grouting hole 13 is used as an anchor rod hole, an anchor rod 3 is set at the grouting hole 13, and the sealing steel plate 11 and the surrounding rock 7 are anchored by the anchor rod 3, which can improve the overall rigidity of the sealing system.

[0066] In step 1), the sealing steel plate 11 is designed according to the size and shape of the underground chamber, and then the sealing steel plate 11 is prefabricated in the factory. Preferably, each ring of the sealing steel lining 1 can be divided into multiple sealing steel plates 11 of the same size according to the division design, and at least one cutting seam line 14 can be marked on the inner side of each sealing steel plate 11 when it is prefabricated in the processing factory, and the grouting holes 13 are arranged at intervals along the marked cutting seam line 14. The cutting seam line 14 extends along the central axis of the expansion joint 2, and the longitudinal spacing of the grouting holes 13 is set according to the arrangement requirement of the anchor rod 3, and the opening diameter is determined according to the size of the anchor rod hole and the grouting hole 13.

[0067] In step 2), the sealing steel plate 11 is spliced by welding in the chamber, and the sealing steel lining 1 is finally formed by splicing ring by ring. Preferably, grouting is performed once every 1-2 rings, specifically, the end of the sealing steel plate 11 is blocked, and then the back of the sealing steel plate 11 is filled with the back filling layer 5 through the corresponding grouting hole 13, to ensure that the back of the sealing steel plate 11 is filled densely.

[0068] In step 3), after the back filling layer 5 of the sealing steel lining 1 is hardened, the cutting seam 12 is formed on the inner side of the sealing steel plate 11 along the pre-marked cutting seam line 14. The continuous cutting seam 12 can be formed by laser cutting process, which has high precision, high efficiency and easy automation control. In this embodiment, the depth of the cutting seam 12 is determined according to the calculation results of the ring deformation of the sealing steel plate 11 and the calculation results of the stiffness of the expansion joint 2.

[0069] As shown in Figure 6 , the embodiment also provides a design method of the adaptive sealing system, comprising the following steps:

[0070] S1, collecting information of the chamber;

[0071] S2, determining the ring pressure relief amount L x of the chamber lining 6-sealing system;

[0072] S3, determining the number n of expansion joints 2 according to the surrounding rock 7 condition, the ring pressure relief amount L x , the number of sealing steel plate 11 blocks, calculating the design elongation u0 of a single expansion joint 2, and preparing the shape and geometric size of the expansion joint 2;

[0073] S4, preliminarily preparing the thickness h0 of the cutting seam 12 and the parameters of the expansion joint 2, establishing a calculation model of the expansion joint 2, as shown in Figure 7 , calculating the overall deformation modulus E jAnd the expansion joint 2 opening deformation U when the circumferential tensile stress P=0.5f. 0.5f f is the yield strength of the sealing steel plate 11;

[0074] S5. Determine the overall deformation modulus E of expansion joint 2. j Do the design elongation u0 of a single expansion joint 2 and the maximum Mises stress σ at the expansion joint 2 meet the following conditions respectively?

[0075] ;

[0076] ;

[0077] ;

[0078] Where k1 is the stiffness weakening coefficient, k2 is the allowable deformation amplification coefficient, and E t Let ψ be the deformation modulus of the sealing steel plate 11, and ψ be the weld coefficient.

[0079] If all the above conditions are met, the design is complete; if at least one condition is not met, return to step S4 and adjust the thickness h0 of the cut 12 and the parameters of the expansion joint 2.

[0080] In this embodiment, the thickness h0 of the slit 12 and the parameters of the expansion joint 2 are initially determined, and then the overall deformation modulus E of the expansion joint 2 is calculated. j And the expansion joint 2 opening deformation U when the circumferential tensile stress P=0.5f. 0.5f Then determine the overall deformation modulus E of expansion joint 2. j The design elongation u0 of a single expansion joint 2 and the maximum mises stress σ at the expansion joint 2 location are checked to ensure that the sealing system can achieve rigidity and flexibility self-adaptation according to different surrounding rock deformation conditions. Furthermore, the thickness h0 of the cut 12 and the parameters of the expansion joint 2 are adjusted to ensure that E... j u0 and σ all meet the requirements.

[0081] In this embodiment, k1 and k2 can be determined comprehensively based on the surrounding rock conditions 7 and the chamber design parameters. Specifically, k1 can be 0.3 and k2 can be 1.2. In step S5, only when the overall deformation modulus E of the expansion joint 2 is... j The design is completed and parameters are output only when the design elongation u0 of a single expansion joint 2 and the maximum Mises stress σ at the expansion joint 2 both meet the corresponding discrimination conditions; the overall deformation modulus E of the expansion joint 2 is also considered. j, the design elongation u0 of the single expansion joint 2 and the maximum mises stress σ of the expansion joint 2 do not meet the corresponding discrimination conditions, or only one parameter meets the corresponding discrimination condition, or only two parameters meet the corresponding discrimination condition, then return to step S4, adjust the thickness h0 of the cut seam 12 and the parameters of the expansion joint 2 until E j , u0 and σ all meet the corresponding discrimination conditions.

[0082] In step S1, the information of the cavern includes but is not limited to the construction scale, capacity, working pressure of the gas storage project, strength parameters of the surrounding rock 7 and engineering characteristics such as the radius R, buried depth, arrangement form of the cavern and the structural thickness t of the sealing steel plate 11.

[0083] In step S3, the number of blocks of the sealing steel plate 11 of each ring of the sealing steel lining 1 can be determined according to the diameter of the cavern, the specification of the sealing steel plate 11, the structural stress and the site conditions. Since at least one cut seam 12 can be arranged on each sealing steel plate 11, and the cut seam 12 corresponds to the expansion joint 2 one by one, the number n of the expansion joint 2 is generally a multiple of the circumferential block of the sealing steel plate 11. The formula for calculating the design elongation u0 of the single expansion joint 2 is: .

[0084] Specifically, in step S3, the shape of the expansion joint 2 is the overall contour shape of the expansion joint 2, and the geometric size of the expansion joint 2 is the contour size. The shape of the expansion joint 2 can be any one of a corrugated shape, a semicircular shape, a rectangular shape, an inverted V shape, a Y shape, a triangular shape, etc.

[0085] In step S4, the calculation model of the expansion joint 2 is established, including: according to the shape and geometric size of the expansion joint 2 and the preliminary thickness h0 of the cut seam 12 and the parameters of the expansion joint 2, the finite element software is used to establish the calculation model of the expansion joint 2, including the expansion joint 2, the deformation layer 22, the pad layer 23, the sealing steel plate 11, the filling layer 5, the lining layer 6 and the surrounding rock 7.

[0086] Further, in step S4, the parameters of the expansion joint 2 include the thickness t0 of the expansion steel plate 21 and the deformation modulus E0 of the deformation layer 22; the overall deformation modulus E j of the expansion joint 2 and the opening deformation amount U of the expansion joint 2 under the circumferential tensile stress P = 0.5f are calculated by the method of: 0.5f

[0087] The model boundary conditions and loads are applied to the calculation model, the opening deformation amount U of the expansion joint 2 under different circumferential tensile stresses P is extracted, and the P-U curve is drawn;

[0088] According to the P-U curve, the overall deformation modulus E j ​, the calculation formula is: , wherein L is the joint width (m), is the change value of the circumferential stress on both sides of the expansion joint 2 (MPa), is the change value of the opening deformation on both sides of the expansion joint 2 (m);

[0089] According to the P-U curve, the opening deformation U of the expansion joint 2 at P=0.5f is calculated 0.5f , and f is the yield strength of the sealing steel plate 11.

[0090] Specifically, the model boundary conditions and loads applied to the calculation model include applying far-field constraints of surrounding rock 7 and contact relationships between different media, and the loads include maximum design internal pressure p0 and circumferential tensile stress P of the sealing steel plate 11, wherein the circumferential tensile force P is increased from 0 to 500 MPa in a gradient manner.

[0091] Further, in step S2, the circumferential yielding amount L of the lining layer 6-sealing system of the chamber x , including:

[0092] Calculate the maximum circumferential strain of the surrounding rock 7-lining layer 6-sealing system under cyclic loading and unloading in the whole life cycle ;

[0093] According to the engineering characteristics, determine the allowable strain value of the lining layer 6-sealing system ; The specific engineering characteristics include engineering scale, operation life, design concept, steel plate material performance, geological conditions, etc.

[0094] Compare and , if , L x is 0; if , L x The calculation formula of .

[0095] In this embodiment, when , the sealing steel plate 11 with a certain thickness can be used, and no circumferential yielding is required; when , circumferential yielding is required, and the circumferential yielding amount L x is calculated.

[0096] Further, the maximum circumferential strain of the surrounding rock 7-lining layer 6-sealing system under cyclic loading and unloading in the whole life cycle , including:

[0097] The finite element software is used to establish the overall calculation model of the compressed air energy storage chamber;

[0098] According to engineering characteristics, the inflation and deflation simulation calculation under the coupling of temperature and pressure is carried out, and the maximum hoop strain of the surrounding rock 7-lining layer 6-sealing system in the whole life cycle is obtained .

[0099] The above merely provides the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An adaptive sealing system for a compressed air energy storage chamber, comprising a sealing steel liner, wherein the sealing steel liner is composed of multiple sealing steel plates spliced ​​together along the circumferential and longitudinal directions, characterized in that: The inner side of the sealing steel plate is provided with a longitudinally extending slit and an expansion joint spanning the slit. The depth of the slit is less than the thickness of the sealing steel plate, and the two ends of the expansion joint extend to both sides of the slit and are connected to the sealing steel plate.

2. The adaptive sealing system as described in claim 1, characterized in that: The expansion joint includes an expansion steel plate, a deformation layer, and a padding layer. The two ends of the expansion steel plate extend to both sides of the cut and are connected to the sealing steel plate. The deformation layer is disposed on the inner side of the expansion steel plate facing the sealing steel plate. The space formed by the deformation layer and the deformation layer is filled with the padding layer.

3. The adaptive sealing system as described in claim 2, characterized in that: The deformable layer has longitudinally extending holes inside.

4. The adaptive sealing system as described in claim 1, characterized in that: The sealing steel plate is provided with grouting holes for injecting grout into the back of the sealing steel lining. An anchor rod is installed in the grouting hole, and the end of the anchor rod is fixed to the sealing steel plate by a pad.

5. A construction method for the adaptive sealing system according to any one of claims 1-4, characterized in that, Includes the following steps: 1) Prefabricate the sealing steel plate in the factory and mark the cut lines on the inner side of the sealing steel plate; 2) Inside the chamber, the sealing steel plates are spliced ​​into a ring; 3) Make a cut along the marked cut line on the inner side of the sealing steel plate; 4) Construct expansion joints.

6. The construction method as described in claim 5, characterized in that, In step 4), the construction of the expansion joint includes: first fixing the deformation layer to the expansion steel plate, then placing both ends of the expansion steel plate on both sides of the cut and connecting them with the sealing steel plate, and then filling the space enclosed by the deformation layer and the sealing steel plate with mortar to form a pad layer.

7. The construction method as described in claim 5, characterized in that, In step 1), when prefabricating the sealing steel plate, grouting holes are opened on the sealing steel plate; in step 2), after the sealing steel lining is formed, grout is injected into the back of the sealing steel lining through the grouting holes to form a filling layer; between steps 3) and 4), the following steps are also included: anchor rods are installed at the grouting holes, and grouting is performed on the anchor rod holes, and the ends of the anchor rods are fixed to the sealing steel plate through the pads.

8. A design method for an adaptive sealing system according to any one of claims 1-4, characterized in that, Includes the following steps: S1. Collect data from the chamber; S2. Determine the circumferential pressure relief L of the lining-sealing system of the chamber. x ; S3, based on the surrounding rock conditions and the circumferential pressure relief L x Determine the number of expansion joints n by dividing the sealing steel plate into sections; calculate the design elongation u0 of a single expansion joint. And determine the shape and geometric dimensions of the expansion joint; S4. Initially determine the thickness h0 of the cut and the parameters of the expansion joint, establish a calculation model of the expansion joint, and calculate the overall deformation modulus E of the expansion joint. j And the expansion joint opening deformation U when the circumferential tensile stress P=0.5f 0.5f f is the yield strength of the sealing steel plate; S5. Determine the overall deformation modulus E of the expansion joint. j Do the design elongation u0 of a single expansion joint and the maximum Mises stress σ at the expansion joint location satisfy the following conditions respectively? ； ； ； Where k1 is the stiffness weakening coefficient, k2 is the allowable deformation amplification coefficient, and E t Let ψ be the deformation modulus of the sealing steel plate, and ψ be the weld coefficient. If all the above conditions are met, the design is complete; if at least one condition is not met, return to step S4 and adjust the thickness h0 of the cut and the parameters of the expansion joint.

9. The design method as described in claim 8, characterized in that, In step S4, the parameters of the expansion joint include the thickness t0 of the expansion steel plate and the deformation modulus E0 of the deformation layer; the overall deformation modulus E of the expansion joint is calculated. j And the expansion joint opening deformation U when the circumferential tensile stress P=0.5f 0.5f The method is as follows: Apply boundary conditions and loads to the calculation model, extract the opening deformation U of the expansion joint under different circumferential tensile stresses P, and plot the PU curve; Calculate the overall deformation modulus E of the expansion joint based on the PU curve. j The calculation formula is: Where L is the joint width, This represents the change in circumferential stress on both sides of the expansion joint. This represents the change in the opening deformation on both sides of the expansion joint; Based on the PU curve, calculate the expansion joint opening deformation U when P=0.5f. 0.5f f is the yield strength of the sealing steel plate.

10. The design method as described in claim 8, characterized in that, In step S2, the circumferential pressure relief L of the lining-sealing system of the chamber is determined. x ,include: Calculate the maximum circumferential strain of the surrounding rock-lining-sealing system over its entire lifespan under cyclic loading and unloading. ; Based on the characteristics of the project, determine the allowable strain value of the lining layer-sealing system. ; Compare and The size, if Then L x Take 0; if Then L x The calculation formula is: .

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