A method for treating a groundwater funnel in a groundwater-sealed cavern

Abstract

The present application relates to the technical field of underground water-sealed cavern, especially to a method for treating underground water funnel in underground water-sealed cavern, wherein when the underground water level in the reservoir area abnormally decreases, real-time monitoring data of the underground water level is collected, all abnormal water level monitoring holes are investigated and eliminated, and a first contour map of the underground water level in the reservoir area is drawn, so that the position, range and water depth of the abnormal water level funnel area can be clearly shown through the first contour map, which facilitates subsequent technical personnel to accurately treat the abnormal water level funnel area and reduces the difficulty of treating the underground water funnel phenomenon. The technical personnel can also regularly draw contour maps to control the recovery process of the abnormal water level funnel area, and when a new underground water funnel phenomenon occurs, the technical personnel can quickly identify and timely respond, thereby significantly improving the safety of the underground water-sealed cavern.

Description

Technical Field

[0001] This invention relates to the field of underground water-sealed cavern technology, and in particular to a method for treating groundwater funnels in underground water-sealed caverns. Background Technology

[0002] A water-sealed underground cavern refers to an underground engineering project where petroleum products are stored in a cavern of a certain volume, artificially excavated within rock below a stable groundwater level. Groundwater is controlled to flow into the cavern through fissures in the surrounding rock to achieve a sealed oil storage system. The core technical challenge in water-sealed underground cavern engineering is ensuring the safety of the water seal, as the water seal is a necessary condition for the operational principle of the cavern. The groundwater level is a crucial indicator for evaluating water seal safety, and understanding its status is essential, especially for areas where groundwater has dropped to form a "funnel," which is a primary focus for ensuring water seal safety.

[0003] Especially during the construction of underground water-sealed caverns, the excavation of underground engineering may expose the original underground faults and fissures, or the excavation may cause changes in stress distribution, leading to the formation of new fissures. These changes can alter the original water-conducting structure, easily triggering the groundwater funnel phenomenon and seriously endangering the water-sealing safety of the underground water-sealed cavern.

[0004] In existing technologies, technicians can generally only qualitatively determine whether a groundwater funnel phenomenon has occurred by observing the abnormal drop in water level in groundwater monitoring wells. It is difficult to accurately control the extent of the groundwater funnel. When formulating response plans, they often try to alleviate the harm of the groundwater funnel by increasing the water curtain pressure of the entire area or by grouting a large area. This leads to increased equipment load and serious resource consumption. In some cases, inadequate handling may even exacerbate the groundwater funnel phenomenon and endanger the safety of the water seal.

[0005] In view of this, it is necessary to propose a method for treating groundwater funnels in underground water-sealed caverns in order to solve or at least alleviate the above-mentioned problems. Summary of the Invention

[0006] The main objective of this invention is to provide a method for treating groundwater funnels in underground water-sealed caverns, in order to solve the technical problem that technicians have difficulty accurately handling the groundwater funnel phenomenon during the construction of underground water-sealed caverns, resulting in resource waste and inadequate treatment.

[0007] To achieve the above objectives, the present invention provides a method for treating groundwater funnels in underground water-sealed caverns, comprising the following steps:

[0008] 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;

[0009] 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;

[0010] 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;

[0011] 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; 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.

[0012] Further, the step S1 specifically comprises the following steps:

[0013] 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;

[0014] 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;

[0015] 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;

[0016] 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.

[0017] Further, the step S1 further comprises the following steps:

[0018] 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;

[0019] Alternatively, a change amplitude of the groundwater level drop of the abnormal water level monitoring hole in the abnormal water level funnel area is obtained, and it is determined whether the change amplitude exceeds a preset amplitude; if yes, step S2 is entered.

[0020] Further, step S2 specifically comprises the following steps:

[0021] The property data of the underground water-conducting structure in the abnormal water level funnel area is obtained, and the arrangement mode of the in-hole grouting hole is determined according to the property data; wherein the grouting hole comprises an in-hole grouting hole, the interval between adjacent in-hole grouting holes is equal to a preset interval, and adjacent rows of in-hole grouting holes are staggered;

[0022] The occurrence data of the underground water-conducting structure in the abnormal water level funnel area is obtained, and the extension direction of the in-hole grouting hole is determined according to the occurrence data; wherein the in-hole grouting hole extends along the radial direction of the underground chamber, and the in-hole grouting hole intersects with the underground water-conducting structure;

[0023] According to the in-hole grouting position, an in-hole grouting hole is opened in the underground chamber where the abnormal water level funnel area is located, and grouting is performed on the in-hole grouting hole to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area.

[0024] Further, step S2 specifically comprises the following steps:

[0025] The property data and occurrence data of the underground water-conducting structure in the abnormal water level funnel area are obtained, and the arrangement mode of the out-hole grouting hole in the water curtain tunnel is determined according to the property data and occurrence data; wherein the grouting hole comprises an out-hole grouting hole, and adjacent rows of out-hole grouting holes are staggered with each other;

[0026] The position of the underground chamber in the abnormal water level funnel area is obtained, and the extension direction of the out-hole grouting hole is determined according to the position of the underground chamber; wherein the out-hole grouting hole extends underground, the out-hole grouting holes are parallel to each other, and the bottom of the out-hole grouting hole is located above the underground chamber;

[0027] According to the out-hole grouting position, out-hole grouting holes are opened in the water curtain tunnel where the abnormal water level funnel area is located at equal intervals, and grouting is performed on the out-hole grouting holes to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area.

[0028] Further preferably, the opening process of the out-hole grouting holes in the same row specifically comprises the following steps:

[0029] Two pilot holes are arranged in the water curtain roadway where the abnormal water level funnel area is located according to the hole-external grouting position; wherein, the hole-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 respectively arranged at the first end and the second end of the hole-external grouting position;

[0030] The arrangement positions of the first sequence holes are determined between the pilot holes, the first sequence holes are arranged, then grouting is performed in the pilot holes and the first sequence holes to obtain a first solidification time length; wherein, the first sequence holes and the pilot holes are arranged at equal intervals.

[0031] It is judged whether the first solidification time length reaches a preset solidification time length; if yes, the arrangement positions of the second sequence holes are determined between the first sequence holes, the second sequence holes are arranged, then grouting is performed in the second sequence holes to obtain a second solidification time length; wherein, the second sequence holes and the first sequence holes are arranged at equal intervals.

[0032] It is judged whether the second solidification time length reaches the preset solidification time length; if yes, the arrangement positions of the third sequence holes are determined between the first sequence holes and the second sequence holes, the third sequence holes are arranged, then grouting is performed in the third sequence holes to complete the construction process of the hole-external grouting holes in the same row.

[0033] Further preferably, the step of arranging two pilot holes specifically comprises the following steps:

[0034] In the arrangement process of the pilot holes, coring is performed downward through the pilot holes to verify the property data and occurrence data of the underground water-conducting structure.

[0035] Preferably, the grouting of the pilot holes, the first sequence holes, the second sequence holes and the third sequence holes adopts sectional and cyclic grouting from bottom to top in the holes; in the grouting process, the water-cement ratio of the grouting slurry is set as four ratio levels of 5, 2, 1 and 0.5, the concentration of the grouting slurry in the holes is changed from dilute to concentrated step by step from bottom to top, and the grouting pressure and the sectional length increase with the increase of the hole depth.

[0036] Further preferably, after the grouting hole completes grouting, the solidification state of the grouting slurry in the grouting hole is obtained, the water pressure test is performed on the grouting hole after the grouting slurry is completely solidified, the grouting water permeability of the grouting hole is obtained, it is judged whether the grouting water permeability is less than or equal to a preset water 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.

[0037] Further preferably, the step S4 is followed by the following steps:

[0038] S5, according to the grouting position in the underground water sealed cave to set up a plurality of inspection holes to check the grouting effect, wherein the number of the inspection hole is not less than 5% of the number of grouting hole, the inspection hole is arranged between the grouting hole, the depth of the inspection hole is consistent with the grouting hole;

[0039] S6, the water yield of the inspection hole is obtained, whether the water yield is less than the preset water yield is judged, if yes, the inspection hole is closed, and S7 is entered, if not, the grouting is injected into the inspection hole and / or the density of the grouting hole is increased, and step S5 is returned to;

[0040] S7, the water permeability of the inspection hole is obtained, whether the water permeability is less than or equal to the preset water permeability is judged, if yes, the inspection hole is closed, and the inspection of the grouting effect is completed, if not, the grouting is injected into the inspection hole and / or the density of the grouting hole is increased, and step S5 is returned to.

[0041] Compared with the prior art, the present application has the following beneficial effects:

[0042] In the present application, a technical personnel can quickly identify an abnormal water level funnel area, determine the range of the abnormal water level funnel area, so as to make a precise and effective response to the processing method of the underground water funnel. When the underground water level in the reservoir area abnormally decreases, the first contour map can clearly show the position, range and water depth of the abnormal water level funnel area, which facilitates subsequent technical personnel to accurately process the abnormal water level funnel area, reduces the difficulty of processing the underground water funnel phenomenon, and saves resources. The technical personnel can also regularly draw the second contour map, so as to control the recovery process of the abnormal water level funnel area, and when a new underground water funnel phenomenon occurs, the technical personnel can quickly identify and respond in time, which significantly improves the safety of the underground water sealed cave. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained according to the structures shown in these drawings without creative labor for those skilled in the art.

[0044] Fig. 1 It is a flowchart of the processing method of the underground water funnel in the underground water sealed cave in an embodiment of the present application;

[0045] Fig. 2 It is a schematic diagram of the first contour map of the reservoir area underground water level in an embodiment of the present application;

[0046] Fig. 3Geological profile view of the hole grouting hole and the hole grouting hole in an embodiment of the present application.

[0047] The purposes, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings.

[0048] Explanation of reference numerals:

[0049] 1, abnormal water level funnel area; 2, water curtain tunnel; 3, construction tunnel; 4, hole grouting hole; 5, underground water conducting structure; 6, underground cavern; 7, hole grouting hole. DETAILED DESCRIPTION

[0050] It should be understood that the specific embodiments described herein merely exemplify the present application and are not intended to limit the present application.

[0051] 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 some of the embodiments of the present application, but not 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.

[0052] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as described in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0053] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection required by the present application.

[0054] The main formation reasons of the underground water level funnel phenomenon include the development of the underground water conducting structure 5, the effectiveness of the water curtain water supply, the timeliness and effect of grouting, etc.

[0055] The aspects of the development of the underground water-conducting structure 5 and the formation of the groundwater level funnel phenomenon are mainly through the following five aspects: ① Geological structure background: Due to the movement and deformation of the crust, various faults, folds and other structural forms are formed. These structural forms provide channels and spaces for the movement and storage of underground water. ② Rock physical properties: such as porosity, permeability, etc., which have important influence on the formation of water-conducting structure. Rocks with high porosity and permeability, such as sandstone, limestone, etc., are more likely to form water-conducting structure. Because the pore and fracture system inside these rocks is developed, it can provide good channels for the flow of underground water. ③ Groundwater level change: the rise and fall of groundwater level also affects the formation of water-conducting structure. When the groundwater level rises, it will exacerbate the erosion and expansion of the fractures in the rock layer; when the groundwater level falls, it may cause the original water-conducting channels to dry up or shrink. ④ Excavation of caverns: in the process of underground engineering excavation, the original faults and fractures may be exposed, or new fractures may be generated due to stress redistribution caused by excavation. ⑤ Grouting: grouting may cause damage to the original rock mass or change its stress state, thereby affecting the formation and development of water-conducting structure.

[0056] In terms of water curtain water supply effectiveness, the formation of the groundwater level funnel phenomenon is mainly through the following three aspects: ① Rock mass characteristics: the permeability, porosity and other characteristics of the rock mass in the reservoir area have a major impact on the effectiveness of water curtain water supply. For example, rock mass with good permeability, water flows and diffuses more easily in it, which is conducive to the formation and maintenance of water curtain. ② Water curtain hole arrangement: the number, spacing and angle of water curtain hole arrangement are directly related to the uniformity and coverage of water curtain water supply. Reasonable arrangement can make water form a continuous and uniform water curtain around the cavern, improving the effectiveness of water sealing. ③ Water supply pressure and flow rate: sufficient pressure and flow rate are the key factors to ensure that the water curtain can form and remain stable. Insufficient pressure may not be able to penetrate water to all areas of the cavern.

[0057] The underground water-conducting structure 5 is a geological structure in the geological body that can conduct and transport underground water, which is a channel and space for the flow of underground water; the water curtain water supply effectiveness can be judged by water curtain single-hole injection-fall test and effectiveness test, such as single-hole injection-fall test. If the water can fall stably in the rock mass as expected after injection, and the fall speed and degree meet the design standard, it means that the water curtain system water supply can effectively act on the rock mass, and the water curtain system effectiveness is good.

[0058] Please refer to Figs. 1 to 3 The following examples mainly achieve the treatment of the abnormal groundwater level funnel area 1 by grouting to reduce the water conductivity of the underground water-conducting structure 5.

[0059] A method for treating a groundwater funnel in a groundwater-sealed cavern, comprising the following steps:

[0060] S1, acquire a first contour map of a current reservoir area underground water level, and then determine an abnormal water level funnel area according to the first contour map;

[0061] S2, acquire property data and occurrence data of underground water-conducting structures 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 structures in the abnormal water level funnel area;

[0062] S3, acquire a second contour map of the reservoir area underground water level after grouting; 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;

[0063] 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 underground water funnel processing process is completed; 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, return to step S2.

[0064] In the present application, a technical personnel can quickly identify an abnormal water level funnel area 1, determine the range of the abnormal water level funnel area 1, and thus make a precise and effective response to the underground water funnel processing method. When the underground water level in the reservoir area abnormally decreases, the first contour map can clearly show the position, range and water depth of the abnormal water level funnel area 1, which facilitates subsequent technical personnel to accurately process the abnormal water level funnel area 1, reduces the difficulty of processing the underground water funnel phenomenon, and saves resources. Technical personnel can also regularly draw a second contour map to control the recovery process of the abnormal water level funnel area 1, and when a new underground water funnel phenomenon occurs, technical personnel can quickly identify and respond in time, which significantly improves the safety of the underground water sealed cave reservoir.

[0065] In the present embodiment, the first preset condition is whether the range of the abnormal water level funnel area 1 remains unchanged or decreases, and the second preset condition is whether the underground water level in the abnormal water level funnel area 1 stops decreasing or rises.

[0066] Further, the first contour map and the second contour map are drawn by the following steps:

[0067] S01, acquire long-term monitoring data of the underground water level of 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;

[0068] S02, obtaining real-time monitoring data of the underground water level in the ith underground water level monitoring hole, and judging whether the real-time monitoring data is lower than the lower limit of a preset range of the duration monitoring curve corresponding to the ith underground water level monitoring hole; if yes, determining that the ith underground water level monitoring hole is an abnormal water level monitoring hole; wherein i is a positive integer, and the initial value of i is 1;

[0069] S03, judging whether the ith underground water level monitoring hole is the last underground water level monitoring hole; if yes, entering S04; if not, assigning i+1 to i, and returning to S02;

[0070] S04, drawing a first contour map of the current reservoir area underground water level according to the real-time monitoring data of all underground water level monitoring holes, and determining an abnormal water level funnel area 1 according to the first contour map; the abnormal water level funnel area 1 in this embodiment is an abnormal water level monitoring hole concentration area.

[0071] When the underground water level in the reservoir area abnormally decreases, the real-time monitoring data of the underground water level is collected, all abnormal water level monitoring holes are found out, and the first contour map of the reservoir area is drawn. The position, range and water depth of the abnormal water level funnel area 1 can be clearly shown through the first contour map, which facilitates subsequent technical personnel to accurately process the abnormal water level funnel area 1 and reduces the difficulty of processing the underground water funnel phenomenon. Technical personnel can also draw contour maps regularly to control the recovery process of the abnormal water level funnel area 1. When a new underground water funnel phenomenon occurs, technical personnel can quickly identify and respond in time, which significantly improves the safety of the underground water sealing cave reservoir.

[0072] Further, the expansion speed of the abnormal water level funnel area 1 is obtained, and it is judged whether the expansion speed is greater than a preset threshold; if yes, immediately enter step S2 to avoid the abnormal water level funnel area 1 being too large to be contained.

[0073] Alternatively, the change amplitude of the underground water level decrease of the abnormal water level monitoring hole in the abnormal water level funnel area 1 is obtained, and it is judged whether the change amplitude exceeds a preset amplitude; if yes, immediately enter step S2 to prevent the depth of the abnormal water level funnel area 1 from further increasing.

[0074] The expansion speed of the abnormal water level funnel area 1 and the change amplitude of the underground water level are used as two judgment bases for the grouting opportunity in this embodiment, which ensures the timeliness of grouting. The expansion speed of the abnormal water level funnel area 1 is closely related to the hydrogeological conditions. If the expansion speed of the abnormal water level funnel area 1 is fast, grouting should be performed as soon as possible to avoid the abnormal water level funnel area 1 being too large and increasing the control difficulty. When the water level in the reservoir area and the surrounding area decreases and the change amplitude is large, grouting should be performed as soon as possible to prevent the funnel from further deepening and expanding.

[0075] The following embodiments control the water conductivity of the underground water-conducting structure 5 from the perspectives of in-hole seepage control measures and out-of-hole seepage control measures respectively.

[0076] In one embodiment, step S2 specifically comprises the following steps:

[0077] The property data of the underground water-conducting structure 5 in the abnormal water level funnel area 1 is acquired, and the in-hole grouting position and the arrangement mode of the in-hole grouting hole 7 are determined according to the property data; wherein the grouting hole comprises the in-hole grouting hole 7, the interval between adjacent in-hole grouting holes 7 is equal to a preset interval, and adjacent rows of in-hole grouting holes 7 are staggered; specifically, the preset interval is 2 m, the aperture of the in-hole grouting hole 7 is 42 mm, and the depth of the in-hole grouting hole 7 is 5 m, and the depth of some special holes is 6 m-10 m.

[0078] The occurrence data of the underground water-conducting structure 5 in the abnormal water level funnel area 1 is acquired, and the extension direction of the in-hole grouting hole 7 is determined according to the occurrence data; wherein the in-hole grouting hole 7 extends along the radial direction of the underground cavern 6, the in-hole grouting hole 7 intersects with the underground water-conducting structure 5, and the intersection angle is greater than or equal to 60°;

[0079] The in-hole grouting hole 7 is opened in the underground cavern 6 where the abnormal water level funnel area 1 is located according to the in-hole grouting position, and grouting is performed on the in-hole grouting hole 7, so as to reduce the water conductivity of the underground water-conducting structure 5 in the abnormal water level funnel area 1.

[0080] Further, step S2 specifically comprises the following steps:

[0081] The property data and occurrence data of the underground water-conducting structure 5 in the abnormal water level funnel area 1 are acquired, and the out-of-hole grouting position and the arrangement mode of the out-of-hole grouting hole 4 in the water curtain tunnel 2 are determined according to the property data and occurrence data; wherein the grouting hole comprises the out-of-hole grouting hole 4, adjacent rows of out-of-hole grouting holes 4 are staggered with each other, and the water curtain tunnel 2 is communicated with the construction tunnel 3;

[0082] The position of the underground cavern 6 in the abnormal water level funnel area 1 is acquired, and the extension direction of the out-of-hole grouting hole 4 is determined according to the position of the underground cavern 6; wherein the out-of-hole grouting hole 4 extends underground, the out-of-hole grouting holes 4 are parallel to each other, and the bottom of the out-of-hole grouting hole 4 is located above the underground cavern 6;

[0083] The out-of-hole grouting hole 4 is opened in the water curtain tunnel 2 where the abnormal water level funnel area 1 is located according to the out-of-hole grouting position, and grouting is performed on the out-of-hole grouting hole 4, so as to reduce the water conductivity of the underground water-conducting structure 5 in the abnormal water level funnel area 1.

[0084] In this embodiment, as a further preferred, the opening process of the out-of-hole grouting holes 4 in the same row specifically comprises the following steps:

[0085] Two pilot holes are arranged in the water curtain roadway 2 where the abnormal water level funnel area 1 is located according to the hole-external grouting position; wherein the hole-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 respectively located at the first end and the last end of the hole-external grouting position.

[0086] The arrangement positions of the first sequence holes are determined between the pilot holes, the first sequence holes are arranged, and then the pilot holes and the first sequence holes are grouted to obtain a first solidification time length; wherein the first sequence holes and the pilot holes are arranged at equal intervals.

[0087] It is judged whether the first solidification time length reaches a preset solidification time length; if yes, the arrangement positions of the second sequence holes are determined between the first sequence holes, the second sequence holes are arranged, and then the second sequence holes are grouted to obtain a second solidification time length; wherein the second sequence holes and the first sequence holes are arranged at equal intervals.

[0088] It is judged whether the second solidification time length reaches the preset solidification time length; if yes, the arrangement positions of the third sequence holes are determined between the first sequence holes and the second sequence holes, the third sequence holes are arranged, and then the third sequence holes are grouted to complete the construction process of the hole-external grouting holes 4 in the same row.

[0089] The hole-external grouting hole 4 sequence construction can avoid the grouting between the hole-external grouting holes 4 from being too close.

[0090] As a further preferred, the two pilot holes are arranged specifically including the following steps:

[0091] During the arrangement of the pilot holes, coring is performed downward through the pilot holes to verify the property data and occurrence data of the underground water-conducting structure 5. Specifically, the diameter of the pilot holes is 75 mm, and the diameters of the first sequence holes, the second sequence holes and the third sequence holes are 65 mm. The underground water-conducting structure 5 is verified through the pilot holes to avoid the data from not being updated in time and the underground water-conducting structure 5 from changing to cause poor grouting effect.

[0092] Preferably, the pilot holes, the first sequence holes, the second sequence holes and the third sequence holes are grouted by using sectional cyclic grouting from bottom to top in the holes; during the grouting process, the water-cement ratio of the grouting slurry is set as four ratio levels of 5, 2, 1 and 0.5, the concentration of the grouting slurry in the holes is changed from dilute to concentrated step by step from bottom to top, the grouting pressure and the sectional length increase with the increase of the hole depth, and the grouting pressure is 1 MPa-5 MPa.

[0093] Further preferably, after the grouting hole is completed, the solidification state of the grouting slurry in the grouting hole is obtained, and when the grouting slurry is completely solidified, the grouting hole is subjected to a water pressure test to obtain the grouting water permeability of the grouting hole, and it is determined whether the grouting water permeability is less than or equal to a preset water 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.

[0094] Further preferably, after step S4, the following steps are further included:

[0095] S5, a plurality of inspection holes are opened in the underground water-sealed cavern according to the grouting position to check the grouting effect; wherein the number of the inspection holes is not less than 5% of the number of the grouting holes, the inspection holes are arranged between the grouting holes, and the depth of the inspection holes is consistent with that of the grouting holes;

[0096] S6, the water discharge of the inspection hole is obtained, and it is determined whether the water discharge is less than a preset water discharge; if yes, the inspection hole is closed, and S7 is entered; if no, the grouting hole is grouted and / or the density of the grouting hole is increased, and step S5 is returned to;

[0097] S7, the water permeability of the inspection hole is obtained, and it is determined whether the water permeability is less than or equal to a preset water permeability; if yes, the inspection hole is closed, and the checking of the grouting effect is completed; if no, the grouting hole is grouted and / or the density of the grouting hole is increased, and step S5 is returned to.

[0098] The inspection hole mainly checks the grouting effect of the grouting hole through the water pressure test, and the water pressure test of the inspection hole should be performed 14 days after the grouting of the surrounding grouting hole of the inspection hole is completed. The preset water discharge is 0.05 L / (min·m), and the preset water permeability is 1 Lu.

[0099] The above is only the preferred embodiment of the present application, and does not limit the patent scope of the present application, and any equivalent structure or equivalent flow transformation obtained by using the content of the specification and drawings of the present application, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method of treating a groundwater funnel in a groundwater-sealed cavern, characterized by, The method comprises the following steps: S1, obtaining a first contour line map of a current reservoir area underground water level, and determining an abnormal water level funnel area according to the first contour line map; S2, obtaining character data and occurrence data of underground water conducting structures in the abnormal water level funnel area, determining a grouting position, opening a grouting hole at the grouting position, and then grouting into the grouting hole to reduce the water conducting rate of the underground water conducting structures in the abnormal water level funnel area; S3, obtaining a second contour line map of the reservoir area underground water level after grouting; determining 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 line map and the second contour line 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 underground water funnel treatment process is completed; 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, returning to step S2; In step S1, the following steps are included: S01, obtaining long-term monitoring data of the reservoir area underground water level, and drawing 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, obtaining real-time monitoring data of the underground water level in the i-th underground water level monitoring hole, and determining 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, determining whether the i-th underground water level monitoring hole is the last underground water level monitoring hole; if yes, step S04 is entered; if not, i+1 is assigned to i, and step S02 is returned to; S04, drawing a first contour line map of the current reservoir area underground water level according to the real-time monitoring data of all underground water level monitoring holes, and determining an abnormal water level funnel area according to the first contour line map.

2. The method of treating a groundwater funnel in a groundwater-sealed cavern according to claim 1, characterized by, After step S1, the following steps are included: Obtaining the expansion speed of the abnormal water level funnel area, and determining whether the expansion speed is greater than a preset threshold; if yes, step S2 is entered; Or, obtaining the change amplitude of the underground water level drop of the abnormal water level monitoring hole in the abnormal water level funnel area, and determining whether the change amplitude exceeds a preset amplitude; if yes, step S2 is entered.

3. The method of treating a groundwater funnel in a groundwater-sealed cavern according to claim 1, characterized by, In step S2, the following steps are included: Obtaining character data of the underground water conducting structures in the abnormal water level funnel area, and determining the in-hole grouting position and the arrangement mode of the in-hole grouting holes according to the character data; wherein the in-hole grouting hole is one type of the grouting hole, the distance between adjacent in-hole grouting holes is equal to a preset distance, and the adjacent in-hole grouting holes are staggered arranged; Obtaining occurrence data of the underground water conducting structures in the abnormal water level funnel area, and determining the extension direction of the in-hole grouting hole according to the occurrence data; wherein the in-hole grouting hole extends along the radial direction of the underground cavern, and the in-hole grouting hole intersects with the underground water conducting structure; According to the in-hole grouting position, in-hole grouting holes are arranged in the underground cavern where the abnormal water level funnel area is located, and grouting is performed on the in-hole grouting holes, so as to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area.

4. The method of treating a groundwater funnel in a groundwater-sealed cavern of claim 1, wherein The step S2 specifically comprises 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 arrangement mode of the in-hole grouting position and the in-hole grouting hole in the water curtain tunnel according to the property data and the occurrence data; wherein the grouting hole comprises an in-hole grouting hole, and the in-hole grouting holes in adjacent two rows are staggered with each other; Obtain the position of the underground cavern in the abnormal water level funnel area, and determine the extension direction of the in-hole grouting hole according to the position of the underground cavern; wherein the in-hole grouting hole extends downward, the in-hole grouting holes are parallel to each other, and the bottom of the in-hole grouting hole is located above the underground cavern; According to the in-hole grouting position, in-hole grouting holes are arranged in the underground cavern where the abnormal water level funnel area is located, and grouting is performed on the in-hole grouting holes, so as to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area.

5. The method of treating a groundwater funnel in a groundwater-sealed cavern according to claim 4, characterized by, The process of arranging the in-hole grouting holes in the same row specifically comprises the following steps: According to the in-hole grouting position, in-hole grouting holes are arranged in the underground cavern where the abnormal water level funnel area is located, and grouting is performed on the in-hole grouting holes, so as to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area. The process of arranging the in-hole grouting holes in the same row specifically comprises the following steps: According to the in-hole grouting position, in-hole grouting holes are arranged in the underground cavern where the abnormal water level funnel area is located, and grouting is performed on the in-hole grouting holes, so as to reduce the water conductivity of the underground water-conducting structure in the abnormal water level funnel area. The process of arranging the in-hole grouting holes in the same row specifically comprises the following steps:

6. The method of treating a groundwater funnel in a groundwater-sealed cavern according to claim 5, characterized by, During the process of arranging the in-hole grouting holes, core sampling is performed downward through the in-hole grouting holes, so as to verify the property data and occurrence data of the underground water-conducting structure. The grouting of the in-hole grouting holes, the first sequence hole, the second sequence hole and the third sequence hole adopts sectional and cyclic grouting from bottom to top in the hole; during the grouting process, the water-cement ratio of the grouting slurry is set as four ratio levels of 5, 2, 1 and 0.5, the concentration of the grouting slurry in the hole is changed from dilute to concentrated step by step from bottom to top, and the grouting pressure and the sectional length increase with the increase of the hole depth.

7. The method of treating a groundwater funnel in a groundwater-sealed cavern according to claim 5, characterized by, ​ 8. The method of treating a groundwater funnel in a groundwater sealed cavern according to any one of claims 1-7, wherein, After the grouting hole is completed, the solidification state of the grouting slurry in the grouting hole is obtained, and when the grouting slurry is completely solidified, the grouting hole is subjected to a water pressure test to obtain the grouting water permeability of the grouting hole, and it is judged whether the grouting water permeability is less than or equal to a preset water 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 of treating a groundwater funnel in a groundwater sealed storage cavern according to any one of claims 1-7, wherein, After step S4, the following steps are further included: S5, according to the grouting position, a plurality of inspection holes are arranged in the underground water-sealed cavern to check the grouting effect; wherein the number of the inspection holes is not less than 5% of the number of the grouting holes, the inspection holes are arranged between the grouting holes, and the depth of the inspection holes is consistent with that of the grouting holes; S6, the water yield of the inspection hole is obtained, and it is judged whether the water yield is less than a preset water yield; if yes, the inspection hole is closed, and S7 is entered; if no, the grouting into the inspection hole and / or the density of the grouting hole is increased, and step S5 is returned to; S7, the water permeability of the inspection hole is obtained, and it is judged whether the water permeability is less than or equal to a preset water permeability; if yes, the inspection hole is closed, and the checking of the grouting effect is completed; if no, the grouting into the inspection hole and / or the density of the grouting hole is increased, and step S5 is returned to.

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