Evaluation Method for the Safety of Multi-stage Water-sealed Oil Caverns

Abstract

The present invention relates to the technical field of underground water-sealed petroleum caverns, and particularly to a method for evaluating the safety of multi-phase water-sealed petroleum caverns. The method obtains the surrounding rock mass quality influence value KV, the cavern seepage flow influence value KQ, and the peak vibration velocity influence value KZ of the cavern rock wall by detecting the surrounding rock mass quality, the seepage flow of the cavern, and the peak vibration velocity of the cavern rock wall, and obtains the safety influence degree evaluation value SI. By comparing the safety influence degree evaluation value SI with the evaluation standard, the influence degree of the newly built water-sealed petroleum cavern on the surrounding rock stability of the adjacent existing water-sealed petroleum cavern can be obtained. Through this method, the safety distance between the expansion project and the existing project of the multi-phase water-sealed stone cavern oil depot can be determined, providing a theoretical basis for the construction of the multi-phase water-sealed stone cavern oil depot, and avoiding increasing the investment of the expansion project due to blindly increasing the safety distance.

Description

Technical Field

[0001] The present invention relates to the technical field of underground water-sealed oil caverns, and in particular to a method for evaluating the safety of multi-phase water-sealed oil caverns. Background Art

[0002] The underground water-sealed cavern is at a certain depth below the stable groundwater level. By artificially excavating a cavern with a certain volume in the underground rock, the water-sealing effect of the stable groundwater is used to seal the oil stored in the cavern. Due to the advantages of safety, environmental protection, cost savings, and land conservation of the underground water-sealed cavern, it has currently become the main form of future oil and gas energy storage in China.

[0003] In order to make full use of the good engineering geological conditions of the existing site and give play to the economy of the underground water-sealed oil cavern, the later-stage underground water-sealed oil storage caverns in China will inevitably be constructed adjacent to the previous storage caverns. Although China has accumulated certain experience in the design, construction, and scientific research of large underground caverns, the underground water-sealed oil cavern is a new type of engineering different from traditional underground caverns such as transportation, water conservancy, hydropower, and civil air defense. Therefore, the existing design experience of underground caverns is not applicable to the construction of underground water-sealed rock oil caverns. There is currently no standard or specification to follow for the safety distance between the expansion project and the existing project of the underground water-sealed rock oil cavern, making the decision-making and implementation of the expansion project without basis. Blindly increasing the safety distance will increase the investment of the expansion project and weaken the superiority of the expansion project. Therefore, it is very necessary to systematically evaluate the safety impact of the multi-phase underground water-sealed cavern project under expansion conditions. Summary of the Invention

[0004] The purpose of the present invention is to provide a method for evaluating the safety of multi-phase water-sealed rock oil caverns. Through this method, the safety distance between the expansion project and the existing project of the multi-phase water-sealed rock oil cavern can be determined, providing a theoretical basis for the construction of the multi-phase water-sealed rock oil cavern.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A method for evaluating the safety of multi-phase water-sealed oil caverns, by detecting the surrounding rock quality, cavern seepage flow rate, and peak vibration velocity of the cavern rock wall of the underground water-sealed oil cavern, obtaining the surrounding rock quality influence value KV, the cavern seepage flow rate influence value KQ, and the peak vibration velocity influence value KZ of the cavern rock wall;

[0007] The following formula is used to obtain the safety impact degree evaluation value SI:

[0008] SI = KV + KQ + KZ (1)

[0009] By comparing the safety impact degree evaluation value SI with the evaluation criteria, the influence degree of the newly built water-sealed petroleum cavern on the surrounding rock stability of the adjacent existing water-sealed petroleum cavern is obtained.

[0010] Furthermore, the quality of the surrounding rock of the lower water-sealed petroleum cavern is obtained by measuring the change ratio RV of the longitudinal wave velocity of the rock mass; the change ratio RV of the longitudinal wave velocity of the rock mass is obtained by the following formula:

[0011]

[0012] In the formula, is the average value of the longitudinal wave velocity of the rock mass of the adjacent existing water-sealed petroleum cavern before the construction of the newly built water-sealed petroleum cavern; is the average value of the longitudinal wave velocity of the rock mass of the adjacent existing water-sealed petroleum cavern after the construction of the newly built water-sealed petroleum cavern.

[0013] Furthermore, the test borehole for measuring the change ratio RV of the longitudinal wave velocity of the rock mass is the monitoring borehole reserved for the existing water-sealed petroleum cavern; or,

[0014] the test borehole for measuring the change ratio RV of the longitudinal wave velocity of the rock mass is the borehole at the boundary of the existing water-sealed petroleum cavern close to the newly built cavern.

[0015] Furthermore, measure the longitudinal wave velocity of the rock mass within the depth range from the vault to the floor of the existing water-sealed petroleum cavern, and take the average wave velocity within this depth range as and

[0016] Furthermore, the influence value KQ of the cavern seepage flow is obtained according to the change ratio RQ of the water curtain roadway make-up water volume Qm and the cavern seepage flow Qd of the adjacent existing water-sealed petroleum cavern during the construction of the newly built water-sealed petroleum cavern;

[0017] The change ratio RQ is obtained by the following formula:

[0018]

[0019]

[0020]

[0021] In the formula, is the change value of the daily average make-up water volume of the water curtain roadway of the existing water-sealed petroleum cavern in the six months to one year before and after the construction of the newly built water-sealed petroleum cavern; is the change value of the cavern seepage flow of the existing water-sealed petroleum cavern in the six months to one year before and after the construction of the newly built water-sealed petroleum cavern; is the daily average make-up water volume of the water curtain roadway of the group of water curtain roadways of the existing water-sealed petroleum cavern closest to the newly built water-sealed petroleum cavern in the six months to one year before the construction of the newly built water-sealed petroleum cavern; is the daily average water make-up volume of the water curtain roadway of the group of water curtain roadways closest to the newly built water-sealed petroleum cavern in the existing water-sealed petroleum cavern from six months to one year after the construction of the newly built water-sealed petroleum cavern; is the daily average cavern seepage flow rate of the existing water-sealed petroleum cavern closest to the newly built water-sealed petroleum cavern from six months to one year before the construction of the newly built groundwater-sealed petroleum cavern; is the daily average cavern seepage flow rate of the existing water-sealed petroleum cavern closest to the newly built water-sealed petroleum cavern from six months to one year after the construction of the newly built groundwater-sealed petroleum cavern.

[0022] Furthermore, the influence value KZ of the peak vibration velocity of the cavern rock wall is obtained according to the peak vibration velocity Vmax at the position of the cavern or shaft rock wall closest to the newly built cavern on the rock wall of the existing water-sealed petroleum cavern during the construction of the newly built water-sealed petroleum cavern.

[0023] Furthermore, a plurality of detection points are arranged on the rock wall of the existing water-sealed petroleum cavern, and the average value of the peak vibration velocities Vmax of the plurality of monitoring points is taken to obtain the influence value KZ of the peak vibration velocity of the cavern rock wall.

[0024] Advantages of the present invention:

[0025] The present invention provides a method for evaluating the safety of multi-phase water-sealed petroleum caverns. This method obtains the influence value KV of the surrounding rock mass quality, the influence value KQ of the cavern seepage flow rate, and the influence value KZ of the peak vibration velocity of the cavern rock wall by detecting the surrounding rock mass quality, the cavern seepage flow rate, and the peak vibration velocity of the cavern rock wall of the newly built groundwater-sealed petroleum cavern; and obtains the safety influence degree evaluation value SI according to the influence value KV of the surrounding rock mass quality, the influence value KQ of the cavern seepage flow rate, and the influence value KZ of the peak vibration velocity of the cavern rock wall; by comparing the safety influence degree evaluation value SI with the evaluation standard, the influence degree of the newly built water-sealed petroleum cavern on the surrounding rock stability of the adjacent existing water-sealed petroleum cavern is obtained.

[0026] Through this method, the safety distance between the expansion project of the multi-phase water-sealed stone cavern oil depot and the existing project can be determined, providing a theoretical basis for the construction of the multi-phase water-sealed stone cavern oil depot, and avoiding increasing the investment of the expansion project due to blindly increasing the safety distance. Specific embodiments

[0027] The technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] It should be noted that in the description of the present invention, the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the shown orientation or positional relationship. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] It should be noted that in the description of the present invention, the terms "connection" and "installation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or connected through an intermediate medium; it can be a mechanical connection, or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] The safety of an underground water-sealed petroleum cavern mainly includes two aspects: the stability of the surrounding rock and the water-sealing property of the cavern. Most newly built underground water-sealed petroleum caverns are constructed by the drill-and-blast method, and its influence on the stability of the surrounding rock and the water-sealing property of the adjacent existing underground water-sealed petroleum cavern (operating cavern) is mainly reflected in the change of the fissures in the surrounding rock of the operating cavern caused by blasting vibration and the dynamic response of the surrounding rock.

[0031] Based on this, the present invention provides a method for evaluating the safety of multi-phase water-sealed petroleum caverns. This method obtains the influence value KV of the surrounding rock quality, the influence value KQ of the cavern seepage flow rate, and the influence value KZ of the peak vibration velocity of the cavern rock wall by detecting the surrounding rock quality, the seepage flow rate of the cavern, and the peak vibration velocity of the cavern rock wall;

[0032] The safety influence degree evaluation value SI is obtained by using the following formula:

[0033] SI = KV + KQ + KZ (1)

[0034] By comparing the safety influence degree evaluation value SI with the evaluation standard, the influence degree of the newly built water-sealed petroleum cavern on the stability of the surrounding rock of the adjacent existing water-sealed petroleum cavern is obtained.

[0035] Through this method, the safety distance between the expansion project and the existing project of the multi-phase water-sealed stone cavern oil depot can be determined, providing a theoretical basis for the construction of the multi-phase water-sealed stone cavern oil depot, avoiding the increase of the investment in the expansion project due to blindly increasing the safety distance, and providing a construction standard and basis for the construction project of the multi-phase water-sealed stone cavern oil depot.

[0036] The following specifically describes the calculation methods for the surrounding rock mass influence value KV, the cavern seepage flow rate influence value KQ, and the peak vibration velocity influence value KZ of the cavern rock wall.

[0037] 1. Surrounding rock mass influence value KV

[0038] During the construction of a newly built cavern, blasting vibration will propagate inside the surrounding rock of the adjacent operating cavern in the form of stress waves, causing the surrounding rock to vibrate to varying degrees, thereby intensifying the development of internal fissures in the surrounding rock and reducing the rock mass quality of the surrounding rock. This evaluation method uses the change in the proportion RV of the longitudinal wave velocity of the rock mass to characterize the change in the rock mass quality.

[0039] The proportion RV of the longitudinal wave velocity of the rock mass is obtained by the following formula:

[0040]

[0041] In the formula, is the average value of the longitudinal wave velocity of the rock mass of the adjacent existing water-sealed petroleum cavern before the construction of the newly built water-sealed petroleum cavern; is the average value of the longitudinal wave velocity of the rock mass of the adjacent existing water-sealed petroleum cavern after the construction of the newly built water-sealed petroleum cavern.

[0042] In this embodiment, the average value of the longitudinal wave velocity of the rock mass of the adjacent existing water-sealed petroleum cavern one year after the start of the construction of the newly built water-sealed petroleum cavern is selected.

[0043] Optionally, the test borehole for measuring the proportion RV of the longitudinal wave velocity of the rock mass is the monitoring borehole reserved for the existing water-sealed petroleum cavern; or, the test borehole for measuring the proportion RV of the longitudinal wave velocity of the rock mass is the borehole at the boundary of the existing water-sealed petroleum cavern on the side close to the newly built cavern.

[0044] The borehole at the boundary of the existing water-sealed petroleum cavern on the side close to the newly built cavern can be a newly drilled borehole during detection.

[0045] In this embodiment, the testing room measures the longitudinal wave velocity of the rock mass within the depth range from the vault to the floor of the existing water-sealed petroleum cavern, and takes the average wave velocity within this depth range as and

[0046] The comparison values between the calculation result of the proportion RV of the longitudinal wave velocity of the rock mass and the surrounding rock mass influence value KV are shown in Table 1.

[0047] Table 1 Surrounding rock mass influence value KV value table

[0048] RV 0.1 > RV ≥ 0 0.25 > RV ≥ 0.1 0.5 > RV ≥ 0.25 RV ≥ 0.5 KV 3 6 9 12

[0049] 2. Cavern seepage flow rate influence value KQ

[0050] The influence of a newly built underground water-sealed petroleum storage cavern on the seepage field of an adjacent operating cavern is mainly manifested in two aspects. One is that the blasting vibration of the newly built cavern will intensify the development of internal fissures in the surrounding rock of the operating cavern, changing the permeability coefficient of the surrounding rock of the operating cavern. The other is that the newly built cavern itself will guide the underground water flow into its interior, thus changing the seepage field of the surrounding rock of the operating cavern. This evaluation method analyzes the influence of the construction of the newly built underground water-sealed petroleum storage cavern on the seepage field of the adjacent operating cavern by monitoring the changes in the water make-up volume of the water curtain roadway and the seepage flow rate of the cavern in the operating cavern.

[0051] The influence value KQ of the cavern seepage flow rate is obtained according to the change ratio RQ of the water make-up volume Qm of the water curtain roadway and the seepage flow rate Qd of the cavern in the existing water-sealed petroleum storage cavern adjacent during the construction of the newly built water-sealed petroleum storage cavern.

[0052] The change ratio RQ is obtained by using the following formula:

[0053]

[0054]

[0055]

[0056] In the formula, is the change value of the average daily water make-up volume of the water curtain roadway in the existing water-sealed petroleum storage cavern from half a year to one year before and after the construction of the newly built water-sealed petroleum storage cavern; is the change value of the cavern seepage flow rate in the existing water-sealed petroleum storage cavern from half a year to one year before and after the construction of the newly built water-sealed petroleum storage cavern; is the average daily water make-up volume of the water curtain roadway of a group of water curtain roadways in the existing water-sealed petroleum storage cavern closest to the newly built water-sealed petroleum storage cavern from half a year to one year before the construction of the newly built water-sealed petroleum storage cavern; is the average daily water make-up volume of the water curtain roadway of a group of water curtain roadways in the existing water-sealed petroleum storage cavern closest to the newly built water-sealed petroleum storage cavern from half a year to one year after the construction of the newly built water-sealed petroleum storage cavern; is the average daily cavern seepage flow rate in the existing water-sealed petroleum storage cavern closest to the newly built water-sealed petroleum storage cavern from half a year to one year before the construction of the newly built water-sealed petroleum storage cavern; is the average daily cavern seepage flow rate in the existing water-sealed petroleum storage cavern closest to the newly built water-sealed petroleum storage cavern from half a year to one year after the construction of the newly built water-sealed petroleum storage cavern.

[0057] The comparison values of the calculation results of the change ratio RQ and the influence value KQ of the cavern seepage flow rate are shown in Table 2.

[0058] Table 2 Value table of the influence value KQ of the cavern seepage flow rate

[0059] RQ 0.1 > RQ ≥ 0 0.25 > RQ ≥ 0.1 0.5 > RQ ≥ 0.25 RQ ≥ 0.5 KQ 3 6 9 12

[0060] 3. Influence value KZ of the peak vibration velocity of the cavern rock wall

[0061] When the blasting vibration during the construction of a newly built underground water-sealed petroleum storage cavern propagates to the surrounding rock wall of an adjacent operating storage cavern, it will cause the vibration of the surrounding rock mass particles on the cavern wall. Excessive vibration will cause the collapse of the rock mass on the cavern wall, affecting the stability and safety of the surrounding rock of the storage cavern. This evaluation method analyzes the influence of the construction of the newly built underground water-sealed petroleum storage cavern on the stability of the surrounding rock of the adjacent operating storage cavern by monitoring the vibration velocity at the key positions (the cavern or shaft rock wall closest to the newly built cavern) of the surrounding rock wall of the operating storage cavern and using the peak vibration velocity.

[0062] In this application, the influence value KZ of the peak vibration velocity of the cavern wall is obtained according to the peak vibration velocity Vmax at the position of the cavern or shaft rock wall closest to the newly built cavern on the rock wall of the existing water-sealed petroleum storage cavern adjacent to the newly built water-sealed petroleum storage cavern during the construction period.

[0063] Optionally, the peak vibration velocity Vmax can be obtained through on-site monitoring; multiple detection points can also be set on the rock wall of the existing water-sealed petroleum storage cavern, and the average value of the peak vibration velocities Vmax of multiple monitoring points is taken. Obtain the influence value KZ of the peak vibration velocity of the cavern wall.

[0064] The comparison values of the peak vibration velocity Vmax of the cavern wall and the influence value KZ of the peak vibration velocity of the cavern wall are shown in Table 3.

[0065] Table 3 Table of the influence value KZ of the peak vibration velocity of the cavern wall

[0066] Vmax (cm / s) 7 > Vmax ≥ 0 15 > Vmax ≥ 7 25 > Vmax ≥ 15 Vmax ≥ 25 KZ 5 10 15 20

[0067] 4. Evaluation value SI of the degree of safety influence

[0068] Through the above calculation method, the values of the surrounding rock mass influence value KV, the influence value KQ of the cavern seepage flow rate, and the influence value KZ of the peak vibration velocity of the cavern wall are obtained. Substitute these three values into formula (1) to obtain the evaluation value SI of the degree of safety influence, and evaluate the degree of influence of the construction of the newly built underground water-sealed petroleum storage cavern on the safety of the adjacent operating storage cavern according to Table 4.

[0069] Table 4 Evaluation standard table of the evaluation value SI of the degree of safety influence

[0070] SI 12 > SI ≥ 0 24 > SI ≥ 12 36 > SI ≥ 24 SI ≥ 36 Degree of influence Slight Moderate Relatively severe Severe

[0071] If the impact degree of the construction of a newly-built underground water-sealed petroleum cavern on the safety of an adjacent operating cavern is slight or moderate, it means that the current spacing between the construction of the newly-built underground water-sealed petroleum cavern and the adjacent operating cavern is within a safe or relatively safe range, and construction can continue according to the plan; if the impact degree of the construction of the newly-built underground water-sealed petroleum cavern on the safety of the adjacent operating cavern is relatively serious or serious, it means that the current spacing between the construction of the newly-built underground water-sealed petroleum cavern and the adjacent operating cavern is within a relatively dangerous or dangerous range, and it is necessary to increase the spacing between the two or take reinforcement measures during subsequent construction to avoid adverse effects on the adjacent operating cavern caused by continued construction.

[0072] The following further elaborates and explains this method based on the application of the evaluation method provided by the present invention in actual projects.

[0073] A certain underground water-sealed petroleum cavern is an oil depot that has been built in the first phase and consists of multiple caverns. It is currently in operation; the second-phase underground cavern is under construction and is located next to the first-phase cavern. The spacing between the two phases of caverns is about 150 meters; the above evaluation method is now used to evaluate the impact degree of the construction of the second-phase cavern on the safety of the first-phase cavern, so as to reasonably layout the subsequent construction.

[0074] Before the blasting construction of the second-phase cavern, the longitudinal wave velocity of the rock mass of the boreholes near the boundary of the first-phase cavern close to the newly-built cavern was measured through the exploration and monitoring holes reserved in the first-phase cavern; within the depth range of the cavern, the longitudinal wave velocity of the surrounding rock mass of the first-phase cavern was 4782 - 5410 m / s, and the average wave velocity One year after the start of the second-phase construction, the wave velocity test of the rock mass of the boreholes in the same range of the surrounding rock was carried out. The longitudinal wave velocity of the surrounding rock mass was 4750 - 5230 m / s, and the average wave velocity Substitute ˉ and ˉ into formula (2), and we can get: RV = 0.03. According to Table 1, KV = 3.

[0075] Within one year before the blasting construction of the second-phase cavern, the average daily water replenishment volume of a group of water curtain roadways in the first-phase cavern close to the second-phase cavern was The average daily seepage flow of the main cavern Within one year after the start of the second-phase construction, the average daily water replenishment volume of a group of water curtain roadways in the first-phase cavern close to the second-phase cavern The average daily seepage flow of the main cavern Substitute the above monitoring values into formula (3), formula (4) and formula (5), and we can get: RQ = 0.07. According to Table 2, KQ = 3.

[0076] During the blasting construction of the second-phase cavern, blasting vibration testers were arranged on the water curtain maintenance roadway and the rock wall of the shaft closest to the second-phase cavern in the first-phase cavern to monitor the vibration velocity of the surrounding rock. The peak vibration velocity was measured to be 0.12 - 0.38 cm / s, and the average value was According to Table 3, KZ = 5 can be obtained.

[0077] Substitute the calculated KV, KQ, and KZ into formula (1), and the evaluation value SI of the influence degree on the safety of the operating cavern can be obtained as SI = 11. According to Table 4, the influence degree of the blasting construction of the second-phase underground oil storage cavern on the safety of the first-phase cavern is: slight.

[0078] Therefore, in this embodiment, the distance between the second-phase underground oil storage cavern and the first-phase cavern is within the safe range, and construction can continue according to the expected plan.

[0079] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the safety of a multi-stage water-sealed petroleum cavern storage, characterized in that, By detecting the surrounding rock mass quality, seepage flow rate of the underground water-sealed petroleum cavern, and peak vibration velocity of the cavern rock wall, the influence value KV of the surrounding rock mass quality, the influence value KQ of the cavern seepage flow rate, and the influence value KZ of the peak vibration velocity of the cavern rock wall are obtained; The safety influence degree evaluation value SI is obtained by using the following formula: SI = KV + KQ + KZ (1) By comparing the safety influence degree evaluation value SI with the evaluation criteria, the influence degree of the newly built water-sealed petroleum cavern on the surrounding rock stability of the adjacent existing water-sealed petroleum cavern is obtained; The surrounding rock mass quality of the underground water-sealed petroleum cavern is obtained by measuring the change ratio RV of the longitudinal wave velocity of the rock mass; the change ratio RV of the longitudinal wave velocity of the rock mass is obtained by using the following formula: （2） In the formula, is the average value of the longitudinal wave velocity of the rock mass of the adjacent existing water-sealed petroleum cavern before the construction of the new water-sealed petroleum cavern; is the average value of the longitudinal wave velocity of the rock mass of the adjacent existing water-sealed petroleum cavern after the construction of the new water-sealed petroleum cavern; The influence value KQ of the cavern seepage flow rate is obtained according to the change ratio RQ of the water curtain roadway make-up water volume Qm and the cavern seepage flow rate Qd of the adjacent existing water-sealed petroleum cavern during the construction of the newly built water-sealed petroleum cavern; the change ratio RQ is obtained by using the following formula: （3） When )(4) When (5) In the formula, is the change value of the daily average water replenishment volume of the water curtain roadway of the existing water-sealed petroleum cavern during the six months to one year before and after the construction of the newly-built water-sealed petroleum cavern; is the change value of the seepage flow rate of the cavern of the existing water-sealed petroleum cavern during the six months to one year before and after the construction of the newly-built water-sealed petroleum cavern; is the daily average water replenishment volume of the water curtain roadway of the group of water curtain roadways of the existing water-sealed petroleum cavern closest to the newly-built water-sealed petroleum cavern during the six months to one year before the construction of the newly-built water-sealed petroleum cavern; is the daily average water replenishment volume of the water curtain roadway of the group of water curtain roadways of the existing water-sealed petroleum cavern closest to the newly-built water-sealed petroleum cavern during the six months to one year after the construction of the newly-built water-sealed petroleum cavern; is the daily average seepage flow rate of the cavern of the existing water-sealed petroleum cavern closest to the newly-built water-sealed petroleum cavern during the six months to one year before the construction of the newly-built underground water-sealed petroleum cavern; is the daily average seepage flow rate of the cavern of the existing water-sealed petroleum cavern closest to the newly-built water-sealed petroleum cavern during the six months to one year after the construction of the newly-built underground water-sealed petroleum cavern; The influence value KZ of the peak vibration velocity of the cavern rock wall is obtained according to the peak vibration velocity Vmax at the position of the cavern or shaft rock wall closest to the newly built cavern on the rock wall of the adjacent existing water-sealed petroleum cavern during the construction of the newly built water-sealed petroleum cavern; Set multiple detection points on the rock wall of the existing water-sealed petroleum cavern, and take the average value of the peak vibration velocities Vmax of multiple monitoring points , and obtain the influence value KZ of the peak vibration velocity of the cavern rock wall.

2. The evaluation method for the safety of multi-stage water-sealed petroleum caverns according to claim 1, wherein The test borehole for measuring the change ratio RV of the longitudinal wave velocity of the rock mass is the monitoring borehole reserved for the existing water-sealed petroleum cavern; or, The test borehole for measuring the change ratio RV of the longitudinal wave velocity of the rock mass is the borehole at the boundary of the existing water-sealed petroleum cavern close to the newly built cavern.

3. The evaluation method for the safety of multi-stage water-sealed petroleum caverns according to claim 1, wherein Measure the longitudinal wave velocity of the rock mass within the depth range from the vault to the floor slab of the existing water-sealed petroleum cavern, and take the average wave velocity within this depth range as and .

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