Treatment method for underground water funnel in underground water-sealed cave depot

Abstract

The invention relates to the technical field of underground water-sealed cave depots, in particular to a method for processing an underground water funnel in an underground water-sealed cave depot, which comprises the following steps of: when the underground water level of a reservoir area abnormally drops, acquiring real-time monitoring data of the underground water level, checking out all abnormal water level monitoring holes, and drawing a first contour map of the underground water level of the reservoir area; the position, the range and the water depth of the abnormal water level funnel area can be clearly displayed through the first contour map, subsequent technicians can conveniently and accurately process the abnormal water level funnel area, and the difficulty of underground water level funnel phenomenon processing is reduced. Technicians can also draw a contour map at regular intervals, so that the recovery process of the abnormal water level funnel area is controlled, when a new underground water funnel phenomenon occurs, the technicians can quickly recognize and timely respond, and the safety of the underground water-sealed cave depot is remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground water-sealed caverns, and particularly relates to a method for treating a groundwater funnel in an underground water-sealed cavern. BACKGROUND

[0002] An underground water-sealed cavern refers to a kind of underground engineering formed by artificially digging a certain volume of caverns below a stable groundwater level to store petroleum products, and the groundwater flows into the caverns through fissures in surrounding rocks to achieve sealed oil storage. The core technical problem in the field of underground water-sealed cavern engineering is how to ensure water sealing safety, and water sealing is a necessary condition for ensuring the operation principle of the underground water-sealed cavern. As an important index for evaluating water sealing safety, the groundwater level is very important to understand, especially the part where the groundwater level drops to form a funnel, which is the main object for treating water sealing safety.

[0003] Especially in the construction process of the underground water-sealed cavern, the excavation of the underground engineering may expose the original faults and fissures and other water-conducting structures, or cause new fissures due to changes in stress distribution, which may change the original water-conducting structure and easily cause the groundwater funnel phenomenon, seriously endangering the water sealing safety of the underground water-sealed cavern.

[0004] In the prior art, the technical personnel can only qualitatively determine whether the groundwater funnel phenomenon occurs by monitoring the abnormal drop of the water level in the groundwater level monitoring hole, and it is difficult to accurately control the range of the groundwater funnel. When formulating a response plan, the water curtain pressure of the entire region is often increased or large-area grouting is performed to alleviate the harm of the groundwater funnel, resulting in an increase in equipment load and serious resource consumption. In some cases, the groundwater funnel phenomenon may be aggravated due to improper treatment, which endangers the water sealing safety.

[0005] Therefore, it is necessary to provide a method for treating a groundwater funnel in an underground water-sealed cavern to at least alleviate the above problems. SUMMARY

[0006] The main purpose of the present application is to provide a method for treating a groundwater funnel in an underground water-sealed cavern to solve the technical problem that the technical personnel cannot accurately treat the groundwater funnel phenomenon in the construction process of the underground water-sealed cavern, resulting in resource waste and improper treatment.

[0007] To achieve the above purpose, the present application provides a method for treating a groundwater funnel in an underground water-sealed cavern, comprising the following steps: S1, obtaining a first contour map of the current reservoir area groundwater level, and then determining an abnormal water level funnel area according to the first contour map; S2, acquire the property data and occurrence data of the underground water-conducting structure in the abnormal water level funnel area, determine a grouting position, open a grouting hole at the grouting position, and then grout into the grouting hole to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area; S3, acquire a second contour map of the underground water level in the reservoir area after grouting; and determine whether the abnormal water level funnel area meets a first preset condition and whether the underground water level in the abnormal water level funnel area meets a second preset condition according to the first contour map and the second contour map; S4, when both the abnormal water level funnel area meeting the first preset condition and the underground water level in the abnormal water level funnel area meeting the second preset condition are met, the processing process of the underground water funnel is completed; or when either or both of the abnormal water level funnel area meeting the first preset condition and the underground water level in the abnormal water level funnel area meeting the second preset condition are not met, the step S2 is returned to.

[0008] Further, the step S1 specifically comprises the following steps: S01, acquire the long-term monitoring data of the underground water level in the entire reservoir area, and draw a long-term monitoring curve of the change of the underground water level in each underground water level monitoring hole in the reservoir area according to the long-term monitoring data; S02, acquire real-time monitoring data of the underground water level in the i th underground water level monitoring hole, and determine whether the real-time monitoring data is lower than the lower limit of a preset range of the long-term monitoring curve corresponding to the i th underground water level monitoring hole; if yes, the i th underground water level monitoring hole is determined as an abnormal water level monitoring hole; wherein i is a positive integer, and the initial value of i is 1; S03, determine whether the i th underground water level monitoring hole is the last underground water level monitoring hole; if yes, proceed to S04; if no, assign i+1 to i, and return to S02; S04, draw a first contour map of the current underground water level in the reservoir area according to the real-time monitoring data of all the underground water level monitoring holes, and then determine the abnormal water level funnel area according to the first contour map.

[0009] Further, the step S1 further comprises the following steps: acquire the expansion speed of the abnormal water level funnel area, and determine whether the expansion speed is greater than a preset threshold; if yes, proceed to step S2; Alternatively, acquire the change amplitude of the decrease of the underground water level of the abnormal water level monitoring hole in the abnormal water level funnel area, and determine whether the change amplitude exceeds a preset amplitude; if yes, proceed to step S2.

[0010] Further, the step S2 specifically comprises the following steps: Obtaining the property data of the underground water-conducting structure in the abnormal water level funnel area, and determining the position of the in-hole grouting and the arrangement mode of the in-hole grouting holes according to the property data; wherein the grouting holes include in-hole grouting holes, the interval between adjacent in-hole grouting holes is equal to a preset interval, and adjacent rows of in-hole grouting holes are staggered; Obtaining the occurrence data of the underground water-conducting structure in the abnormal water level funnel area, and determining the extension direction of the in-hole grouting holes according to the occurrence data; wherein the in-hole grouting holes extend along the radial direction of the underground chamber, and the in-hole grouting holes intersect with the underground water-conducting structure; According to the position of the in-hole grouting, in-hole grouting holes are arranged in the underground chamber where the abnormal water level funnel area is located, and grouting is performed on the in-hole grouting holes to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area.

[0011] Further, step S2 specifically includes the following steps: Obtaining the property data and occurrence data of the underground water-conducting structure in the abnormal water level funnel area, and determining the position of the out-of-hole grouting in the water curtain tunnel and the arrangement mode of the out-of-hole grouting holes according to the property data and occurrence data; wherein the grouting holes include out-of-hole grouting holes, and adjacent rows of out-of-hole grouting holes are staggered; Obtaining the position of the underground chamber in the abnormal water level funnel area, and determining the extension direction of the out-of-hole grouting holes according to the position of the underground chamber; wherein the out-of-hole grouting holes extend underground, the out-of-hole grouting holes are parallel to each other, and the bottom of the out-of-hole grouting holes is located above the underground chamber; According to the position of the out-of-hole grouting, out-of-hole grouting holes are arranged in the water curtain tunnel where the abnormal water level funnel area is located at equal intervals, and grouting is performed on the out-of-hole grouting holes to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area.

[0012] Further preferably, the process of arranging the out-of-hole grouting holes in the same row specifically includes the following steps: According to the position of the out-of-hole grouting, two pilot holes are arranged in the water curtain tunnel where the abnormal water level funnel area is located; wherein the out-of-hole grouting holes in the same row are divided into pilot holes, first sequence holes, second sequence holes and third sequence holes, and the pilot holes are located at the first end and the last end of the out-of-hole grouting position; The position of the first sequence hole is determined between the pilot holes, the first sequence hole is arranged, and then grouting is performed in the pilot holes and the first sequence holes to obtain the first solidification time; wherein the first sequence holes and the pilot holes are arranged at equal intervals. Determine whether the first solidification time has reached the preset solidification time; if so, determine the opening position of the second sequence hole between the first sequence holes, construct the second sequence hole, and then inject grout into the second sequence hole to obtain the second solidification time; wherein, the second sequence holes are set at equal intervals between each other and between the second sequence hole and the first sequence hole. Determine whether the second solidification time has reached the preset solidification time; if so, determine the opening position of the third sequence hole between the first sequence hole and the second sequence hole, construct the third sequence hole, and then inject grout into the third sequence hole to complete the construction process of the external grouting holes in the same row.

[0013] More preferably, the process of opening two pilot holes specifically includes the following steps: During the opening of the pilot hole, a core sampling operation is performed downward through the pilot hole to verify the property data and occurrence data of the underground water-conducting structure.

[0014] Preferably, the grouting of the pilot hole, first sequence hole, second sequence hole and third sequence hole adopts segmented circulating grouting from bottom to top in the hole; during the grouting process, the water-cement ratio of the grout is set to four levels: 5, 2, 1 and 0.5, and the concentration of the grout in the hole changes from thin to thick from bottom to top. The grouting pressure and segment length increase with the increase of hole depth.

[0015] More preferably, after the grouting hole is filled, the solidification state of the grout in the grouting hole is obtained. After the grout has completely solidified, a water pressure test is performed on the grouting hole to obtain the grouting permeability. It is then determined whether the grouting permeability is less than or equal to a preset permeability. If so, the grouting of the grouting hole is completed. If not, the grouting hole is further filled, and the above process is repeated.

[0016] More preferably, the following steps are included after step S4: S5. According to the grouting location, multiple inspection holes are opened in the underground water-sealed cavern to check the grouting effect; wherein, the number of inspection holes is not less than 5% of the number of grouting holes, the inspection holes are set between the grouting holes, and the depth of the inspection holes is the same as that of the grouting holes. S6. Obtain the water flow rate of the inspection hole and determine whether the water flow rate is less than the preset water flow rate; if yes, close the inspection hole and proceed to S7; if no, inject grout into the inspection hole and / or increase the density of the grouting holes, and return to step S5. S7. Obtain the permeability of the inspection hole and determine whether the permeability is less than or equal to the preset permeability. If yes, close the inspection hole to complete the grouting effect check. If no, inject grout into the inspection hole and / or increase the density of the grouting holes, and return to step S5.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This invention innovatively proposes a method for handling groundwater funnels, enabling technicians to quickly identify and determine the extent of abnormal water level funnels, thereby allowing for precise and effective responses. When an abnormal drop in groundwater level occurs in a reservoir area, a first contour map clearly shows the location, extent, and depth of the abnormal water level funnel, facilitating precise handling by technicians and reducing the difficulty of managing groundwater funnel phenomena, while conserving resources. Technicians can also periodically draw a second contour map to monitor the recovery process of the abnormal water level funnel. When new groundwater funnel phenomena occur, technicians can quickly identify them and respond promptly, significantly improving the safety of groundwater-sealed caverns. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Fig. 1 This is a schematic flowchart of a method for treating groundwater funnels in a groundwater-sealed cavern according to an embodiment of the present invention. Fig. 2 This is a schematic diagram of the first contour map of the groundwater level in the reservoir area according to one embodiment of the present invention; Fig. 3 This is a geological cross-sectional view of the grouting holes inside and outside the tunnel in one embodiment of the present invention.

[0020] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0021] Explanation of icon numbers: 1. Abnormal water level funnel area; 2. Water curtain tunnel; 3. Construction tunnel; 4. Grouting hole outside the tunnel; 5. Underground water guiding structure; 6. Underground cavern; 7. Grouting hole inside the tunnel. Detailed Implementation

[0022] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0025] Furthermore, the use of terms such as "first" and "second" in this invention is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this invention.

[0026] The main causes of the groundwater level funnel phenomenon include the development of the underground water-conducting structure 5, the effectiveness of the water curtain water supply, and the timeliness and effect of grouting.

[0027] Regarding the development of groundwater-conducting structures, the formation of groundwater level funnels is mainly due to the following five aspects: ① Geological structural background: Due to crustal movement and deformation, various faults, folds, and other structural forms have been formed. These structural forms provide channels and spaces for the movement and storage of groundwater. ② Rock physical properties: Such as porosity and permeability have a significant impact on the formation of water-conducting structures. Rocks with high porosity and permeability, such as sandstone and limestone, are more likely to form water-conducting structures because these rocks have well-developed pore and fracture systems, which can provide good channels for the flow of groundwater. ③ Groundwater level changes: The rise and fall of groundwater levels also affect the formation of water-conducting structures. When the groundwater level rises, it will intensify the erosion and expansion of fractures in the rock strata; when the groundwater level falls, it may cause the original water-conducting channels to dry up or shrink. ④ Excavation of caverns: During the excavation of underground engineering projects, existing faults and fractures may be exposed, or new fractures may be generated due to stress redistribution caused by excavation. ⑤ Grouting and sealing: Grouting may cause certain damage to the original rock strata or change their stress state, thereby affecting the formation and development of water-conducting structures.

[0028] Regarding the effectiveness of water curtain water supply, the formation of the groundwater level funnel phenomenon is mainly due to the following three aspects: ① Rock mass characteristics: The permeability and porosity of the rock mass in the reservoir area have a significant impact on the effectiveness of water curtain water supply. For example, in rock masses with better permeability, water flows and diffuses more easily, which is conducive to the formation and maintenance of the water curtain. ② Arrangement of water curtain holes: The number, spacing, and angle of the water curtain holes directly affect the uniformity and coverage of the water curtain supply. A reasonable arrangement can enable water to form a continuous and uniform water curtain around the cavern, improving the effectiveness of the water seal. ③ Water supply pressure and flow rate: Sufficient pressure and flow rate are key factors to ensure that the water curtain can form and remain stable. Insufficient pressure may prevent water from penetrating to all areas of the cavern.

[0029] The underground water-conducting structure 5 is a geological structure in the geological body that can conduct and transport groundwater. It is the channel and space for groundwater to flow underground. The effectiveness of the water curtain water supply can be judged by water curtain single-hole injection-fallback test and effectiveness test. For example, in the single-hole injection-fallback test, if the water can fall back stably in the rock mass as expected after injection, and the fallback speed and degree meet the design standards, it indicates that the water curtain system can effectively act on the rock mass and the water curtain system is effective.

[0030] Please see Figs. 1 to 3 The following embodiments mainly address the abnormal water level funnel zone 1 by grouting to reduce the water conductivity of the underground water-conducting structure 5.

[0031] A method for treating groundwater funnels in underground water-sealed caverns includes the following steps: S1. Obtain the first contour map of the current groundwater level in the reservoir area, and then determine the abnormal water level funnel area based on the first contour map; S2. Obtain the property data and occurrence data of the underground water-conducting structure in the abnormal water level funnel area, determine the grouting location, open a grouting hole at the grouting location, and then inject grout into the grouting hole to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area. S3. Obtain the second contour map of the groundwater level in the reservoir area after grouting; determine whether the abnormal water level funnel area meets the first preset condition and whether the groundwater level in the abnormal water level funnel area meets the second preset condition based on the first contour map and the second contour map. S4. When both of the following conditions are met simultaneously: the abnormal water level funnel area meets the first preset condition and the groundwater level within the abnormal water level funnel area meets the second preset condition, the groundwater funnel treatment process is completed; if any one or both of the following conditions are not met: the abnormal water level funnel area meets the first preset condition and the groundwater level within the abnormal water level funnel area meets the second preset condition, the process returns to step S2.

[0032] This invention innovatively proposes a method for handling groundwater funnels, enabling technicians to quickly identify and determine the extent of abnormal water level funnel zones 1, thereby allowing for precise and effective responses. When an abnormal drop in groundwater level occurs in the reservoir area, a first contour map clearly shows the location, extent, and depth of the abnormal water level funnel zone 1, facilitating precise handling of this area by technicians. This reduces the difficulty of managing groundwater funnel phenomena and saves resources. Technicians can also periodically draw a second contour map to monitor the recovery process of the abnormal water level funnel zone 1. When new groundwater funnel phenomena occur, technicians can quickly identify them and respond promptly, significantly improving the safety of the groundwater-sealed cavern reservoir.

[0033] In this embodiment, the first preset condition is whether the range of the abnormal water level funnel area 1 remains unchanged or shrinks, and the second preset condition is whether the groundwater level in the abnormal water level funnel area 1 stops falling or rises.

[0034] Furthermore, the first and second contour maps are drawn through the following steps: S01. Obtain the historical monitoring data of the groundwater level in the entire reservoir area, and draw the historical monitoring curve of the groundwater level change in each groundwater level monitoring well in the reservoir area based on the historical monitoring data. S02. Obtain real-time monitoring data of the groundwater level in the i-th groundwater level monitoring borehole, and determine whether the real-time monitoring data is lower than the lower limit of the preset range of the historical monitoring curve corresponding to the i-th groundwater level monitoring borehole; if so, determine that the i-th groundwater level monitoring borehole is an abnormal water level monitoring borehole; where i is a positive integer and the initial value of i is 1. S03. Determine whether the i-th groundwater level monitoring well is the last groundwater level monitoring well; if yes, proceed to S04; if no, assign i+1 to i and return to S02. S04. Draw the first contour map of the current groundwater level in the reservoir area based on the real-time monitoring data of all groundwater level monitoring wells, and then determine the abnormal water level funnel area 1 based on the first contour map; in this embodiment, the abnormal water level funnel area 1 is the concentrated area of ​​abnormal water level monitoring wells.

[0035] When an abnormal drop in groundwater level occurs in the reservoir area, real-time monitoring data of the groundwater level is collected, all abnormal water level monitoring wells are identified, and a first contour map of the reservoir area is drawn. This first contour map clearly shows the location, extent, and depth of the abnormal water level funnel area 1, facilitating precise handling of the abnormal water level funnel area 1 by subsequent technicians and reducing the difficulty of dealing with the groundwater level funnel phenomenon. Technicians can also periodically draw contour maps to monitor the recovery process of the abnormal water level funnel area 1. When a new groundwater funnel phenomenon occurs, technicians can quickly identify it and respond promptly, significantly improving the safety of the groundwater-sealed cavern reservoir.

[0036] Further, the expansion rate of the abnormal water level funnel zone 1 is obtained, and it is determined whether the expansion rate is greater than a preset threshold; if so, step S2 is immediately initiated to prevent the abnormal water level funnel zone 1 from becoming too large and difficult to contain.

[0037] Alternatively, obtain the change range of groundwater level drop in the abnormal water level monitoring hole within the abnormal water level funnel zone 1, and determine whether the change range exceeds a preset range; if so, immediately proceed to step S2 to prevent the depth of the abnormal water level funnel zone 1 from increasing further.

[0038] This embodiment uses the expansion rate of the abnormal water level funnel zone 1 and the fluctuation range of the groundwater level as two criteria for determining the timing of grouting, ensuring the timeliness of grouting. The expansion rate of the abnormal water level funnel zone 1 is closely related to hydrogeological conditions. If the expansion rate of the abnormal water level funnel zone 1 is rapid, grouting should be carried out as early as possible to avoid the abnormal water level funnel zone 1 becoming too large and increasing the difficulty of control. When the water level in and around the reservoir drops and the fluctuation range is large, grouting should be carried out as early as possible to prevent the funnel from deepening and expanding further.

[0039] The following embodiments control the water conductivity of the underground water-conducting structure 5 from two perspectives: seepage control measures inside the tunnel and seepage control measures outside the tunnel.

[0040] In one embodiment, step S2 specifically includes the following steps: Obtain the property data of the underground water-conducting structure 5 within the abnormal water level funnel zone 1, and determine the grouting location and the arrangement of the grouting holes 7 within the tunnel based on the property data; wherein, the grouting holes include the grouting holes 7 within the tunnel, the spacing between adjacent grouting holes 7 within the tunnel is equal to the preset spacing, and the grouting holes 7 in adjacent rows of tunnels are arranged alternately; specifically, the preset spacing is 2m, the diameter of the grouting hole 7 within the tunnel is 42mm, the hole depth is 5m, and the hole depth in some special tunnel sections is 6m-10m.

[0041] Obtain the occurrence data of the underground water-conducting structure 5 within the abnormal water level funnel zone 1, and determine the extension direction of the grouting hole 7 in the cave based on the occurrence data; wherein, the grouting hole 7 in the cave extends radially along the underground cavern 6, and the grouting hole 7 in the cave intersects with the underground water-conducting structure 5 at an angle greater than or equal to 60°. According to the grouting location inside the cave, an in-cave grouting hole 7 is opened in the underground cavern 6 where the abnormal water level funnel area 1 is located, and grout is injected into the in-cave grouting hole 7 to reduce the water conductivity of the underground water-conducting structure 5 in the abnormal water level funnel area 1.

[0042] Furthermore, step S2 specifically includes the following steps: Obtain the property data and occurrence data of the underground water-conducting structure 5 within the abnormal water level funnel area 1, and determine the location of external grouting in the water curtain tunnel 2 and the arrangement of external grouting holes 4 based on the property data and occurrence data; wherein, the grouting holes include external grouting holes 4, and the external grouting holes 4 in two adjacent rows are staggered, and the water curtain tunnel 2 is connected to the construction tunnel 3; The location of the underground cavern 6 within the abnormal water level funnel zone 1 is obtained, and the extension direction of the external grouting hole 4 is determined based on the location of the underground cavern 6; wherein, the external grouting hole 4 extends underground, the external grouting holes 4 are parallel to each other, and the bottom of the external grouting hole 4 is located above the underground cavern 6. According to the location of the external grouting, external grouting holes 4 are opened at equal intervals in the water curtain tunnel 2 where the abnormal water level funnel area 1 is located, and grout is injected into the external grouting holes 4 to reduce the water conductivity of the underground water-conducting structure 5 in the abnormal water level funnel area 1.

[0043] In this embodiment, as a further preferred embodiment, the process of opening the external grouting holes 4 located in the same row specifically includes the following steps: According to the location of the external grouting, two pilot holes are opened in the water curtain tunnel 2 where the abnormal water level funnel area 1 is located; among them, the external grouting holes 4 in the same row are divided into pilot holes, first sequence holes, second sequence holes and third sequence holes, and the pilot holes are located at the beginning and end of the external grouting location respectively. The opening position of the first sequence hole is determined between the pilot holes, the first sequence hole is made, and then grout is injected into the pilot holes and the first sequence hole to obtain the first solidification time; wherein, the first sequence holes are equally spaced between each other and between the first sequence hole and the pilot hole. Determine whether the first solidification time has reached the preset solidification time; if so, determine the opening position of the second sequence hole between the first sequence holes, construct the second sequence hole, and then inject grout into the second sequence hole to obtain the second solidification time; wherein, the second sequence holes are set at equal intervals between each other and between the second sequence hole and the first sequence hole. Determine whether the second solidification time has reached the preset solidification time; if so, determine the opening position of the third hole between the first and second sequence holes, construct the third hole, and then inject grout into the third hole to complete the construction process of the external grouting holes 4 in the same row.

[0044] In this embodiment, the sequential construction of the external grouting holes 4 can avoid the grout leakage between adjacent external grouting holes 4 due to their close proximity.

[0045] As a further preferred embodiment, the process of opening two pilot holes specifically includes the following steps: During the drilling of the pilot hole, core sampling is performed downwards through the pilot hole to verify the property and occurrence data of the underground water-conducting structure 5. Specifically, the diameter of the pilot hole is 75 mm, and the diameters of the first, second, and third sequence holes are 65 mm. Verifying the underground water-conducting structure 5 through the pilot hole prevents data updates from being delayed and avoids changes in the underground water-conducting structure 5 that could lead to poor grouting results.

[0046] Preferably, the grouting of the pilot hole, first sequence hole, second sequence hole and third sequence hole adopts segmented circulating grouting from bottom to top in the hole; during the grouting process, the water-cement ratio of the grout is set to four levels: 5, 2, 1 and 0.5. The concentration of the grout in the hole changes from thin to thick from bottom to top. The grouting pressure and segment length increase with the hole depth. The grouting pressure is 1MPa-5MPa.

[0047] More preferably, after the grouting hole is filled, the solidification state of the grout in the grouting hole is obtained. After the grout has completely solidified, a water pressure test is performed on the grouting hole to obtain the grouting permeability. It is then determined whether the grouting permeability is less than or equal to a preset permeability. If so, the grouting of the grouting hole is completed. If not, the grouting hole is further filled, and the above process is repeated.

[0048] More preferably, the following steps are included after step S4: S5. According to the grouting location, multiple inspection holes are opened in the underground water-sealed cavern to check the grouting effect; wherein, the number of inspection holes is not less than 5% of the number of grouting holes, the inspection holes are set between the grouting holes, and the depth of the inspection holes is the same as that of the grouting holes. S6. Obtain the water flow rate of the inspection hole and determine whether the water flow rate is less than the preset water flow rate; if yes, close the inspection hole and proceed to S7; if no, inject grout into the inspection hole and / or increase the density of the grouting holes, and return to step S5. S7. Obtain the permeability of the inspection hole and determine whether the permeability is less than or equal to the preset permeability. If yes, close the inspection hole to complete the grouting effect check. If no, inject grout into the inspection hole and / or increase the density of the grouting holes, and return to step S5.

[0049] The inspection hole is mainly used to check the grouting effect of the grouting hole through a water pressure test. The water pressure test of the inspection hole should be carried out 14 days after the completion of grouting of the grouting holes around the inspection hole. The preset water output is 0.05 L / (min·m), and the preset permeability is 1 Lu.

[0050] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A method for treating groundwater funnels in underground water-sealed caverns, characterized in that, Includes the following steps: S1. Obtain the first contour map of the current groundwater level in the reservoir area, and then determine the abnormal water level funnel area based on the first contour map; S2. Obtain the property data and occurrence data of the underground water-conducting structure in the abnormal water level funnel area, determine the grouting location, open a grouting hole at the grouting location, and then inject grout into the grouting hole to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area. S3. Obtain the second contour map of the groundwater level in the reservoir area after grouting; determine whether the abnormal water level funnel area meets the first preset condition and whether the groundwater level in the abnormal water level funnel area meets the second preset condition based on the first contour map and the second contour map. S4. When both of the following conditions are met simultaneously: the abnormal water level funnel area meets the first preset condition and the groundwater level within the abnormal water level funnel area meets the second preset condition, the groundwater funnel treatment process is completed; if any one or both of the following conditions are not met: the abnormal water level funnel area meets the first preset condition and the groundwater level within the abnormal water level funnel area meets the second preset condition, the process returns to step S2. Specifically, step S1 includes the following steps: S01. Obtain the historical monitoring data of the groundwater level in the entire reservoir area, and draw the historical monitoring curve of the groundwater level change in each groundwater level monitoring well in the reservoir area based on the historical monitoring data. S02. Obtain real-time monitoring data of the groundwater level in the i-th groundwater level monitoring borehole, and determine whether the real-time monitoring data is lower than the lower limit of the preset range of the historical monitoring curve corresponding to the i-th groundwater level monitoring borehole; if so, determine that the i-th groundwater level monitoring borehole is an abnormal water level monitoring borehole; where i is a positive integer and the initial value of i is 1. S03. Determine whether the i-th groundwater level monitoring well is the last groundwater level monitoring well; if yes, proceed to step S04; if no, assign i+1 to i and return to step S02. S04. Draw the first contour map of the current groundwater level in the reservoir area based on the real-time monitoring data of all groundwater level monitoring wells, and then determine the abnormal water level funnel area based on the first contour map.

2. The method for treating groundwater funnels in underground water-sealed caverns according to claim 1, characterized in that, The following steps are included after step S1: Obtain the expansion rate of the abnormal water level funnel area and determine whether the expansion rate is greater than a preset threshold; if so, proceed to step S2. Alternatively, obtain the change range of groundwater level drop at the abnormal water level monitoring well within the abnormal water level funnel area, and determine whether the change range exceeds a preset range; if so, proceed to step S2.

3. The method for treating groundwater funnels in underground water-sealed caverns according to claim 1, characterized in that, Step S2 specifically includes the following steps: Obtain the characteristic data of the underground water-conducting structure within the abnormal water level funnel area, and determine the grouting location and the arrangement of grouting holes in the tunnel based on the characteristic data; wherein, the grouting holes in the tunnel are one type of grouting holes, the spacing between adjacent grouting holes in the tunnel is equal to the preset spacing, and the grouting holes in adjacent rows of tunnels are arranged alternately. Obtain the occurrence data of the underground water-conducting structure within the abnormal water level funnel area, and determine the extension direction of the grouting hole in the cave based on the occurrence data; wherein, the grouting hole in the cave extends radially along the underground cavern, and intersects with the underground water-conducting structure. According to the grouting location inside the cave, grouting holes are opened in the underground cavern where the abnormal water level funnel area is located, and grout is injected into the grouting holes to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area.

4. The method for treating groundwater funnels in underground water-sealed caverns according to claim 1, characterized in that, Step S2 specifically includes the following steps: Obtain the property data and occurrence data of the underground water-conducting structure in the abnormal water level funnel area, and determine the location of external grouting in the water curtain tunnel and the arrangement of external grouting holes based on the property data and occurrence data; wherein, the grouting holes include external grouting holes, and the external grouting holes in adjacent rows are staggered. The location of the underground cavern within the abnormal water level funnel area is obtained, and the extension direction of the external grouting holes is determined based on the location of the underground cavern; wherein, the external grouting holes extend underground, are parallel to each other, and the bottom of the external grouting holes is located above the underground cavern; According to the location of the external grouting, external grouting holes are opened at equal intervals in the water curtain tunnel where the abnormal water level funnel area is located, and grout is injected into the external grouting holes to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area.

5. The method for treating groundwater funnels in underground water-sealed caverns according to claim 4, characterized in that, The specific steps for opening the external grouting holes located in the same row include the following: According to the location of the external grouting, two pilot holes are opened in the water curtain tunnel where the abnormal water level funnel area is located; among them, the external grouting holes in the same row are divided into pilot holes, first sequence holes, second sequence holes and third sequence holes, and the pilot holes are located at the beginning and end of the external grouting location respectively. The opening position of the first sequence hole is determined between the pilot holes, the first sequence hole is made, and then grout is injected into the pilot holes and the first sequence hole to obtain the first solidification time; wherein, the first sequence holes are equally spaced between each other and between the first sequence hole and the pilot hole. Determine whether the first solidification time has reached the preset solidification time; if so, determine the opening position of the second sequence hole between the first sequence holes, construct the second sequence hole, and then inject grout into the second sequence hole to obtain the second solidification time; wherein, the second sequence holes are set at equal intervals between each other and between the second sequence hole and the first sequence hole. Determine whether the second solidification time has reached the preset solidification time; if so, determine the opening position of the third sequence hole between the first sequence hole and the second sequence hole, construct the third sequence hole, and then inject grout into the third sequence hole to complete the construction process of the external grouting holes in the same row.

6. The method for treating groundwater funnels in underground water-sealed caverns according to claim 5, characterized in that, The specific steps involved in opening the two pilot holes are as follows: During the opening of the pilot hole, a core sampling operation is performed downward through the pilot hole to verify the property data and occurrence data of the underground water-conducting structure.

7. The method for treating groundwater funnels in underground water-sealed caverns according to claim 5, characterized in that, The grouting of the pilot hole, first sequence hole, second sequence hole and third sequence hole adopts segmented circulating grouting from bottom to top in the hole; during the grouting process, the water-cement ratio of the grout is set to four levels: 5, 2, 1 and 0.

5. The concentration of the grout in the hole changes from thin to thick from bottom to top. The grouting pressure and segment length increase with the increase of hole depth.

8. The method for treating groundwater funnels in underground water-sealed caverns according to any one of claims 1-7, characterized in that, After grouting is completed in the grouting hole, the solidification state of the grout in the grouting hole is obtained. When the grout has completely solidified, a water pressure test is performed on the grouting hole to obtain the grouting permeability. It is then determined whether the grouting permeability is less than or equal to the preset permeability. If yes, the grouting of the grouting hole is completed. If no, the grouting hole is further grouted, and the above process is repeated.

9. The method for treating groundwater funnels in underground water-sealed caverns according to any one of claims 1-7, characterized in that, The following steps are included after step S4: S5. According to the grouting location, multiple inspection holes are opened in the underground water-sealed cavern to check the grouting effect; wherein, the number of inspection holes is not less than 5% of the number of grouting holes, the inspection holes are set between the grouting holes, and the depth of the inspection holes is the same as that of the grouting holes. S6. Obtain the water flow rate of the inspection hole and determine whether the water flow rate is less than the preset water flow rate; if yes, close the inspection hole and proceed to S7; if no, inject grout into the inspection hole and / or increase the density of the grouting holes, and return to step S5. S7. Obtain the permeability of the inspection hole and determine whether the permeability is less than or equal to the preset permeability. If yes, close the inspection hole to complete the grouting effect check. If no, inject grout into the inspection hole and / or increase the density of the grouting holes, and return to step S5.

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