Grouting method, system and device for underground water-sealed cave depot

Abstract

The invention discloses a grouting method, device and system for an underground water-sealed cave depot. The method comprises the steps that a water stop area of a first step is determined based on hydrological monitoring data, a cave depot first step post-grouting hole is drilled in an upper layer water curtain roadway of the water stop area, cave depot first step post-grouting water stop is conducted firstly, and then a water stop area of a next step is determined according to the water outlet condition of the previous step of the cave depot; and drilling a post-grouting hole of the next step of the cave depot in the position of the side wall of the upper layer of the cave depot, and then performing post-grouting and water injection on the next step of the cave depot until all steps are grouted. Low-pressure grouting from top to bottom is achieved through the grouting holes and step-by-step segmented grouting, the influence of a crack water seepage path and seepage pressure on grouting plugging is fully considered, it can be guaranteed that the overall effect of grouting and water stopping is good, the grouting cost can be reduced, operation is easy and convenient, practicability is high, and the application range is wide; and the influence of surrounding underground water on cave depot seepage control is reduced to the greatest extent.

Description

Technical Field

[0001] The invention relates to the technical field of cavern water stopping, and in particular to a grouting water stopping method and device for underground water-sealed cavern. Background Art

[0002] The standard for groundwater seepage control of underground water-sealed petroleum caverns stipulates that after the waterproof plugging of underground water-sealed petroleum caverns, the water seepage of the cavern during operation should not exceed 200m3 per 1 million cubic meters. 3 / d, it is not allowed to adjust the water inflow during the operation period according to the rock permeability of each cavern. Due to the strict groundwater seepage control indicators, the seepage control is difficult, and it is difficult to achieve the seepage control indicators of the entire cavern. Therefore, each underground water-sealed oil cavern needs to match a large amount of grouting and water-stopping work during the construction period to meet the conditions for project acceptance. Underground water-sealed oil caverns are usually buried hundreds of meters underground. According to calculations, the average hydrostatic pressure in the oil storage cavern is about 1.5MPa. Post-grouting in the cave must use high-pressure grouting of more than 3-4MPa. At present, the underground water-sealed caverns that have been built mainly use pre-grouting and post-grouting water-stopping in the oil storage cavern. The existing grouting and water-stopping methods are all grouting from the inside of the oil storage cavern, and usually require the use of high-pressure grouting to implement grouting. Summary of the invention

[0003] The high-pressure grouting method used in the existing grouting water-stopping method will cause the original surrounding rock fissures to split, increase the grouting volume and water inflow, and the slurry is easy to overflow from the shortest path, that is, bypassing the grouting hole and leaking from the side, causing slurry waste and increasing grouting costs. In addition, the existing grouting water-stopping methods all perform grouting from the inside of the oil storage cavern, with poor grouting effects, and do not consider the influence of the surrounding rock fissure water penetration path and penetration pressure on grouting plugging. In general, the existing grouting water-stopping methods have poor overall effects, complex operations, and high grouting costs. How to ensure the grouting water-stopping effect while improving the economy of underground water-sealed caverns has become an urgent problem to be solved.

[0004] In order to solve the problem that high pressure causes cracks in the surrounding rock to split, resulting in an increase in water inflow, slurry easily overflows from the shortest path, and grouting is performed from the inside of the oil storage cavern, the present invention proposes a method, system and device for grouting underground water-sealed caverns that overcomes or at least partially solves the above problems based on the construction characteristics of underground water-sealed caverns and the current technical status of water-stop grouting and plugging, and establishes a full process and complete technical solution for low-pressure grouting and plugging of underground water-sealed caverns, which is suitable for multiple scenarios such as different engineering geology, different hydrogeology, and different underground engineering layouts. Through the integration of multiple technologies and methods, a low-cost, highly targeted, highly reliable, and widely applicable method is provided for seepage control and grouting plugging of underground water-sealed caverns, which can be quickly applied to the construction of large-scale underground water-sealed cavern projects, providing technical support for the development of underground water-sealed caverns.

[0005] In a first aspect, an embodiment of the present invention provides an underground water-sealed cavern grouting method, comprising:

[0006] According to the hydrological monitoring data of the cavern, the water stop area of ​​the first step of the cavern that needs to be plugged by post-grouting is determined, and the post-grouting hole points of the first step are arranged in the water curtain roadway above the water stop area plugged by post-grouting;

[0007] According to the layout of the cavern project, a first step rear grouting hole is drilled at the first step rear grouting hole point, and the first step is grouting-sealed through the first step rear grouting hole;

[0008] According to the water discharge of the previous step of the cavern, determine the water stop area of ​​the next step of the cavern that needs to be plugged by post-grouting, arrange the post-grouting hole points of the next step at the side wall of the previous step, and drill the post-grouting holes of the next step;

[0009] After the grouting of the previous step of the cavern is completed, the grouting and plugging of the next step is carried out through the grouting hole behind the next step;

[0010] Repeat the steps of determining the area of ​​the next step of the cavern that needs to be post-grouted and sealed to stop water according to the water outflow situation of the previous step of the cavern, until all the steps of the cavern are grouted and sealed.

[0011] In some optional embodiments, determining the water stop area of ​​the first step of the cavern that needs to be post-grouted and plugged according to the hydrological monitoring data of the cavern includes:

[0012] Obtain hydrological monitoring data of the cavern, including water supply and drainage of each unit, water inflow of each unit, water leakage at each location, water supply of water curtain holes, and any one of pressure gauge hole data;

[0013] After the cavern of the cavern is excavated, the water-stop tunnel sections of a specified length in the first step of the cavern where the water inflow exceeds the set water inflow threshold, as well as the water-stop tunnel sections within a specified distance range before and after the water outlet where the single-point water inflow exceeds the set water inflow threshold, are determined based on the hydrological monitoring data; the determined water-stop tunnel sections are used as the water-stop areas that need to be post-grouting sealed in the first step of the cavern.

[0014] In some optional embodiments, determining the area of ​​the next step of the cavern that needs to be post-grouted and sealed according to the water discharge of the previous step of the cavern includes:

[0015] Check the water discharge from the upper step of the cavern;

[0016] After the previous step is excavated, the water stop tunnel section with a specified length in the next step of the cavern where the water inflow exceeds the set water inflow threshold is determined according to the water outflow situation of the previous step of the cavern, as well as the water stop tunnel section within a specified distance range before and after the water outflow point where the single-point water inflow exceeds the set water inflow threshold;

[0017] Determine the water stop hole section of the previous step where grouting has been implemented based on the grouting work of the previous step;

[0018] The determined water stop tunnel section will be used as the water stop area for the next step of the tunnel that needs to be post-grouting and sealed.

[0019] In some optional embodiments, the step of drilling the first step rear grouting hole at the first step rear grouting hole point according to the arrangement of the cavern engineering includes:

[0020] Calculate the inclination angle and drilling depth of the grouting hole after the first step according to the layout of the water curtain tunnel and the cavern;

[0021] Calculate the external insertion angle of the first step rear grouting hole according to the actual grouting contour line influence range and the rear grouting hole drilling depth;

[0022] The first step rear grouting hole is drilled at the first step rear grouting hole point according to the hole inclination angle, drilling depth and external insertion angle of the first step rear grouting hole.

[0023] In some optional embodiments, arranging the position of the rear grouting hole of the next step at the side wall position of the previous step and drilling the rear grouting hole of the next step includes:

[0024] According to the side wall position of the previous step and the structure of the cavern, calculate the hole inclination angle and drilling depth of the grouting hole behind the next step;

[0025] Calculate the external insertion angle of the next step's rear grouting hole according to the actual grouting contour line influence range and the rear grouting hole drilling depth;

[0026] The grouting hole behind the next step is drilled at the grouting hole position behind the next step according to the hole inclination angle, drilling depth and external insertion angle of the grouting hole behind the next step.

[0027] In some optional embodiments, drilling a grouting hole after the first step or drilling a grouting hole after the next step further includes:

[0028] After the rear grouting holes of each step are drilled, the rear grouting holes are cleaned; the cleaning of the rear grouting holes includes washing the holes and removing debris in the holes;

[0029] After the post-grouting hole is cleaned, a water pressure test is carried out to measure the hydrostatic pressure in the hole.

[0030] In some optional embodiments, a grouting stopper is provided in the rear grouting hole of each step, and the segmented grouting and sealing of each step is implemented through the grouting stopper.

[0031] In some optional embodiments, segmented grouting and plugging of each step is implemented by using a grout stopper, including:

[0032] Determine the number of sections for segmented grouting and the grouting length of each section according to the drilling depth of the grouting hole;

[0033] The grouting pressure is determined according to the measured hydrostatic pressure and the grouting pressure does not exceed the preset pressure;

[0034] According to the determined grouting pressure and the preset grouting slurry water-cement ratio parameters, the slurry is controlled to be injected into the rear grouting holes of the current step of the cavern at a preset injection speed and injection volume to seal the surrounding rock cracks in the water-stopping area of ​​the rear grouting of the current step of the oil storage cavern.

[0035] In some optional embodiments, implementing segmented grouting and plugging of each step by using a grout stopper also includes:

[0036] After the grouting of each step is completed, the plan for additional grouting is determined based on the change in the amount of water leakage in the water-stopping area sealed by grouting behind the current step.

[0037] In a second aspect, an embodiment of the present invention provides an underground water-sealed cavern grouting device, comprising:

[0038] The water stop area determination module is used to determine the water stop area of ​​the first step of the cavern that needs to be sealed by post-grouting according to the hydrological monitoring data of the cavern; and to determine the area of ​​the next step of the cavern that needs to be sealed by post-grouting according to the water discharge of the previous step of the cavern;

[0039] The hole position determination module is used to arrange the first step post-grouting hole points in the water curtain tunnel on the upper layer of the water stop area blocked by post-grouting; and to arrange the next step post-grouting hole points at the side wall position of the previous step;

[0040] A parameter determination module is used to determine the drilling parameters of the first step rear grouting hole at the first step rear grouting hole point according to the layout of the cavern project, and to determine the drilling parameters of the next step rear grouting hole according to the layout of the previous step side wall position, so as to drill the rear grouting hole according to the drilling parameters, and the rear grouting hole is used for grouting plugging;

[0041] The control module is used to control the operation of the water-stop area determination module and the hole position determination module, by repeatedly executing the steps of determining the area of ​​the next step of the cavern that needs to be post-grouting and water-stopping according to the water outflow situation of the previous step of the cavern, until all the steps of the cavern are grouting and sealed.

[0042] In a third aspect, an embodiment of the present invention provides an underground water-sealed cavern grouting system, comprising:

[0043] Drilling equipment, grouting equipment and grouting devices for the above-mentioned underground water-sealed caverns;

[0044] Drilling equipment, used for drilling post-grouting holes according to the determined post-grouting hole locations;

[0045] The grouting equipment is used to implement grouting and sealing through the drilled post-grouting holes.

[0046] The beneficial effects of the above technical solution provided by the embodiment of the present invention include at least:

[0047] The present invention provides an underground water-sealed cavern grouting method. The method determines the water-stopping area of ​​the first step based on hydrological monitoring data, and first performs water-stopping by grouting after the first step of the cavern by drilling grouting holes in a water curtain tunnel on the upper layer of the water-stopping area; then determines the water-stopping area of ​​the next step according to the water discharge of the previous step of the cavern, and drills grouting holes behind the next step of the cavern at the position of the side wall of the previous layer of the cavern, and then performs grouting and water injection behind the next step of the cavern, and completes the grouting and plugging of the cavern layer by layer. During the grouting and plugging, the hydrological conditions of the strata surrounding the cavern are fully considered, such as the influence of hydrological data such as the infiltration path and infiltration pressure of surrounding rock fissure water on the grouting and plugging, and the water-stopping area of ​​the strata surrounding the cavern is also considered, and grouting and plugging from top to bottom are carried out in a targeted manner, so as to minimize the influence of surrounding groundwater on the seepage control of the oil storage cavern; the method can ensure that the overall effect of grouting and water-stopping is better, and the grouting cost can be reduced, and the operation is simple and convenient, the practicability is strong, and the application range is wide.

[0048] Optionally, when grouting for water stopping, the grouting pressure, speed and slurry injection volume are controlled, and parameters such as the position, spacing, hole length, hole inclination, length of segmented grouting plugs, and grouting contour line of the grouting holes are adjusted according to actual working conditions, which can optimize a large space; the above method is based on the monitoring and analysis of water seepage data in the cave, and realizes the coordination of grouting holes, grouting plugs and layered and segmented grouting, so as to carry out a top-down low-pressure grouting strategy, so as to avoid the problem that the surrounding rock fissures are easily fractured and split during high-pressure grouting, resulting in an increase in water gushing, and the slurry is easy to overflow from the shortest path. The grouting water stopping method for underground water-sealed caverns of the present invention has the advantages of strong pertinence, good grouting effect, low grouting cost, convenient operation, wide range of application, etc., and can be quickly applied to the construction of large-scale underground water-sealed cavern projects.

[0049] Other features and advantages of the present invention will be described in the following description, and partly become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures particularly pointed out in the written description, claims, and drawings.

[0050] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0052] Figure 1 This is a flow chart of the underground water-sealed cavern grouting method in Embodiment 1 of the present invention;

[0053] Figure 2 It is a structural schematic diagram of the cavern engineering in the first embodiment of the present invention;

[0054] Figure 3 It is a horizontal cross-sectional schematic diagram of the cavern in the first embodiment of the present invention;

[0055] Figure 4 It is a vertical cross-sectional schematic diagram of the cavern in the first embodiment of the present invention;

[0056] Figure 5 A schematic diagram of the structure of a cavern in the first embodiment of the present invention

[0057] Figure 6 This is a schematic diagram of the structure of the underground water-sealed cavern grouting device in the second embodiment of the present invention;

[0058] Figure 7 It is a schematic diagram of the structure of the underground water-sealed cavern grouting system in the third embodiment of the present invention. DETAILED DESCRIPTION

[0059] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0060] During the construction period, a large amount of grouting and water-stopping work is required to meet the conditions for project acceptance. However, the existing grouting and water-stopping methods have poor overall effects, complex operations, and high grouting costs. How to ensure the grouting and water-stopping effect while improving the economy of underground water-sealed caverns has become an urgent problem to be solved.

[0061] In order to solve the problems existing in the prior art that high pressure causes cracks in the surrounding rock to split, increasing the amount of water gushing, the slurry is easy to overflow from the shortest path, and grouting is performed from the inside of the cavern, based on the construction characteristics of underground water-sealed caverns and the technical status of water-stopping grouting and plugging, the embodiments of the present invention provide a grouting method, system, and device for underground water-sealed caverns. A full process and a complete technical solution for low-pressure grouting and plugging of underground water-sealed caverns have been established, which is suitable for multiple scenarios such as different engineering geology, different hydrogeology, and different underground engineering layouts. This method has the advantages of strong pertinence, good grouting effect, low grouting cost, high reliability, convenient operation, and a wide range of applications, providing good technical support for the grouting and water-stopping work of underground water-sealed caverns.

[0062] Embodiment 1

[0063] Embodiment 1 of the present invention provides a method for grouting underground water-sealed caverns, the process of which is as follows: Figure 1 As shown, the following steps are included:

[0064] Step S101: determining the water stop area of ​​the first step of the cavern that needs to be plugged by post-grouting according to the hydrological monitoring data of the cavern, and arranging the post-grouting hole points of the first step in the water curtain tunnel above the water stop area plugged by post-grouting;

[0065] Step S102: drilling a first step rear grouting hole at the first step rear grouting hole point according to the layout of the cavern project, and performing grouting and plugging of the first step through the first step rear grouting hole;

[0066] Step S103: determining the water stop area of ​​the next step of the cavern that needs to be plugged by post-grouting according to the water discharge of the previous step of the cavern, arranging the post-grouting hole points of the next step at the side wall of the previous step and drilling the post-grouting holes of the next step;

[0067] Step S104: after the grouting of the previous step of the cavern is completed, the grouting and plugging of the next step is carried out through the grouting hole behind the next step;

[0068] Step S105: Determine whether there are any steps that have not been grouted. If so, execute step S103; if not, complete the grouting work.

[0069] Preferably, in the above step S101, determining the water stop area of ​​the first step of the cavern that needs to be post-grouted and plugged according to the hydrological monitoring data of the cavern includes:

[0070] Obtain hydrological monitoring data of the cavern, including water supply and drainage of each unit, water inflow of each unit, water leakage at each location, water supply of water curtain holes, and any one of pressure gauge hole data;

[0071] After the cavern of the cavern is excavated, the water-stop tunnel sections of a specified length in the first step of the cavern where the water inflow exceeds the set water inflow threshold, as well as the water-stop tunnel sections within a specified distance range before and after the water outlet where the single-point water inflow exceeds the set water inflow threshold, are determined based on the hydrological monitoring data; the determined water-stop tunnel sections are used as the water-stop areas that need to be post-grouting sealed in the first step of the cavern.

[0072] According to the construction experience of several underground water-sealed caverns that have been constructed, when the water seepage of the cavern is small, the difficulty of grouting and stopping water in the back of the cavern is relatively small. Therefore, the present invention mainly solves the problem of low grouting and blocking effect when the water inflow is large and the groundwater seepage pressure is large. In this embodiment, the grouting work of the underground water-sealed cavern is divided into three steps: upper step, middle step, and lower step. The water inflow threshold and distance range can be set according to the actual situation of the cavern. When the grouting work of the upper step is carried out, the judgment criteria for the grouting and stopping water area after the upper step are: after the cavern of the cavern is excavated, the cave section with a water inflow of more than 10L / min every 10m; after the cavern of the cavern is excavated, the 6m cave sections before and after the water outlet point with a single-point water inflow of more than 10L / min.

[0073] The grouting density range of the upper step of the cavern is 6m before and after the above-mentioned water-stopping area. The purpose of setting the dense grouting range is to grout and seal the surrounding rock cracks within a certain range around the area where the upper step needs to be water-stopped. This treatment will make the grouting and sealing effect better. In actual construction, the grouting density range can be appropriately adjusted according to the construction situation. Figure 2 As shown, Figure 2 The fan-shaped annular area surrounded by the oil storage cavern vault and the low-pressure grouting outline is the grouting density range of the upper step, and the shaded part is the area where the rear grouting holes of the upper step need to be grouted.

[0074] In step S101, the rationality of the points of the rear grouting holes must be ensured when the points are arranged. The rear grouting holes are positioned by arranging the points to ensure the accuracy of the position when drilling. For example, in this embodiment, the distance between the rear grouting holes and the side wall of the water curtain tunnel is no more than 1m, the distance between two adjacent holes is no more than 2m, and the distance between the bottoms of the rear grouting holes is no more than 4m. Different from the method of grouting from the inside of the cavern in the prior art, the present invention arranges the grouting holes of the upper steps in the water curtain tunnel, which solves the limitation problem of grouting from the inside of the oil storage cavern in the built underground water-sealed cavern, fully considers the influence of the fissure water infiltration path and infiltration pressure on the grouting plugging, and minimizes the influence of the surrounding groundwater on the cavern seepage control of the cavern. See Figure 2 As shown, the dots in the water curtain tunnel are the locations of the grouting holes after the upper step.

[0075] Preferably, in the above step S102, drilling the first step rear grouting hole at the first step rear grouting hole point according to the arrangement of the cavern project includes:

[0076] Calculate the inclination angle and drilling depth of the grouting hole after the first step according to the layout of the water curtain tunnel and the cavern;

[0077] Calculate the external insertion angle of the first step rear grouting hole according to the actual grouting contour line influence range and the rear grouting hole drilling depth;

[0078] The first step rear grouting hole is drilled at the first step rear grouting hole point according to the hole inclination angle, drilling depth and external insertion angle of the first step rear grouting hole.

[0079] According to the positional relationship between the water curtain tunnel and the cavern, the hole inclination angle and drilling depth of the rear grouting hole are calculated before drilling. The external insertion angle of each rear grouting hole can be calculated according to the actual grouting contour line influence range and the drilling depth of the rear grouting hole. It is necessary to ensure that the bottom of the rear grouting hole is 6m outside the upper step excavation contour line of the oil storage cavern. The purpose of this is that in this embodiment, the effective grouting distance range within the contour line is 6m, but the cracks within a certain distance range outside the contour line should be blocked, so that the crack blocking and water stopping effect will be better. In the actual construction process, the bottom of the grouting hole and the effective grouting distance range can be adjusted appropriately.

[0080] Preferably, in the above step S103, determining the area of ​​the next step of the cavern that needs to be post-grouted and sealed according to the water discharge of the previous step of the cavern includes:

[0081] Check the water discharge from the upper step of the cavern;

[0082] After the previous step is excavated, the water stop tunnel section with a specified length in the next step of the cavern where the water inflow exceeds the set water inflow threshold is determined according to the water outflow situation of the previous step of the cavern, as well as the water stop tunnel section within a specified distance range before and after the water outflow point where the single-point water inflow exceeds the set water inflow threshold;

[0083] Determine the water stop hole section of the previous step where grouting has been implemented based on the grouting work of the previous step;

[0084] The determined water stop tunnel section will be used as the water stop area for the next step of the tunnel that needs to be post-grouting and sealed.

[0085] According to the hydrological monitoring data in the tunnel and the corresponding grouting experience, the judgment criteria for the grouting water-stopping area behind the step in this embodiment are determined as follows: the tunnel section where grouting has been implemented on the upper step; the tunnel section where the water inflow exceeds 10L / min every 10m after the excavation of the upper step; the tunnel section 6m before and after the water outlet point where the single-point water inflow on the upper step exceeds 10L / min; during the implementation of the construction process, each specific parameter can be adjusted.

[0086] The grouting density range of the steps in the tunnel is 6m before and after the above-mentioned water-stop area. Figure 3 It is a horizontal cross-section diagram of the cavern. Figure 3 In the figure, the parallelogram part enclosed by the shaded areas on both sides is the pre-grouting area of ​​the middle step. The slurry will flow in this pre-grouting area to seal the surrounding rock cracks in the area where water stopping is required. Figure 3 The area surrounded by the rectangle in the middle is the grouting density range of the middle step.

[0087] Correspondingly, the criteria for determining the water-stopping area after grouting at the lower step in this embodiment are: the tunnel section where grouting has been implemented at the middle step; the tunnel section where the water inflow exceeds 10L / min per 10m after the middle step is excavated; the tunnel section 6m before and after the water outlet point where the water inflow at a single point on the middle step exceeds 10L / min;

[0088] Correspondingly, the grouting density range of the lower step of the tunnel is 6m before and after the above-mentioned water-stop area.

[0089] Preferably, in step S103, based on the determined water stop area, the location of the rear grouting hole of the next step is arranged at the side wall position of the previous step and the rear grouting hole of the next step is drilled, including:

[0090] According to the side wall position of the previous step and the structure of the cavern, calculate the hole inclination angle and drilling depth of the grouting hole behind the next step;

[0091] Calculate the external insertion angle of the next step's rear grouting hole according to the actual grouting contour line influence range and the rear grouting hole drilling depth;

[0092] The grouting hole behind the next step is drilled at the grouting hole position behind the next step according to the hole inclination angle, drilling depth and external insertion angle of the grouting hole behind the next step.

[0093] In this embodiment, the inclination angle and drilling depth of the low-pressure grouting holes are calculated before the low-pressure drilling of the middle and lower steps. The external insertion angle of each low-pressure grouting hole can also be calculated according to the actual grouting contour line influence range and the length of the low-pressure grouting hole. It is necessary to ensure that the bottom of the low-pressure grouting hole extends 6m beyond the excavation contour line of the lower and middle steps of the oil storage cavern. Each grouting hole is no more than 0.5m away from the side wall of the upper step of the cavern, the distance between two adjacent holes is no more than 3m, and the distance between the bottom of the rear grouting hole is no more than 4m. During construction, the position of the grouting hole, the distance between two adjacent holes, the drilling depth, the inclination angle, the grouting contour line and other parameters can be adjusted according to the actual working conditions.

[0094] Figure 4 This is a vertical cross-section diagram of the cavern. Figure 4 The multiple straight lines in the shaded part represent the drilling lines of the post-grouting holes, that is, the bottom of the post-grouting holes must be drilled to the end of these drilling lines. The blank part is the cavern of the cavern. The inner shaded area is the effective grouting range of the cavern, and the outer shaded area is the range of slurry diffusion after grouting. The slurry needs to diffuse further after reaching the bottom of the hole. The slurry in the diffusion range can also seal the surrounding rock cracks around the effective grouting range, thereby making the sealing effect better.

[0095] Preferably, drilling the rear grouting hole for the first step or drilling the rear grouting hole for the next step also includes: after the drilling of the rear grouting hole for each step is completed, cleaning the rear grouting hole; the cleaning of the rear grouting hole includes washing the hole and removing debris in the hole; after the cleaning of the rear grouting hole is completed, a water pressure test is performed to measure the hydrostatic pressure in the hole.

[0096] After the drilling is completed, the hole needs to be washed, otherwise it will cause the water seepage cracks in the short distance around the hole wall to be quickly blocked, thus affecting the efficiency of the post-grouting hole. Various parameters in the cleaning process can be configured as needed. For example, in the actual construction process, effective equipment that can perform 1MPa pressure and large flow cleaning on boreholes over 20m needs to be prepared in advance. According to engineering experience, the flushing pressure can be 80% of the grouting pressure and not more than 1MPa. The flushing time can be stopped when the return water is clean, which is not more than 20 minutes.

[0097] Each grouting hole is fully flushed before grouting, and the inside of the hole is kept flat so that the grouting material can enter and fill smoothly. The cleaned post-grouting hole is convenient for the slurry to flow, avoiding the blockage of debris and hollowing, and ensuring the sealing of the oil storage cavern after grouting. After the hole is flushed, a simple water pressure test is carried out to measure the hydrostatic pressure in the hole to facilitate the subsequent determination of the grouting pressure. For formations whose performance is easily deteriorated after contact with water, fissure flushing and simple water pressure test may not be performed.

[0098] Preferably, in the above-mentioned steps S102 and S104, a grouting stopper is provided in the rear grouting hole of each step, and the segmented grouting and sealing of each step is implemented by the grouting stopper.

[0099] In this embodiment, a grout stopper is set in the rear grouting hole 10m away from the upper step contour line of the oil storage cavern. Figure 5 This is a structural diagram of a cavern. The stopper of the grouting hole after the upper step is placed in Figure 5 It is marked that a grouting pipe is provided in the stop plug. When grouting, the slurry flows from the grouting pipe of the stop plug from top to bottom into the grouting hole to realize segmented grouting. The placement position of the stop plugs of the remaining steps can be determined according to the drilling depth of the grouting holes of each step.

[0100] Preferably, the segmented grouting and plugging of each step is implemented by using a grout stopper, including:

[0101] Determine the number of sections for segmented grouting and the grouting length of each section according to the drilling depth of the grouting hole;

[0102] The grouting pressure is determined according to the measured hydrostatic pressure and the grouting pressure does not exceed the preset pressure;

[0103] According to the determined grouting pressure and the preset grouting slurry water-cement ratio parameters, the slurry is controlled to be injected into the rear grouting holes of the current step of the cavern at a preset injection speed and injection volume to seal the surrounding rock cracks in the water-stopping area of ​​the rear grouting of the current step of the oil storage cavern.

[0104] In this embodiment, the post-grouting hole needs to be grouted in sections. The number of sections can be determined as needed, for example, 2-3 sections. The number of sections depends on the drilling depth. The grouting length of each section during section grouting is preferably about 6m, and should not be greater than 10m. In this implementation case, it is divided into 2 sections. The bottom of the stop plug is 10m away from the upper step contour line of the oil storage cavern, and the upper part of the stop plug is not less than 6m away from the bottom plate of the water curtain tunnel. The sectioned backward grouting is adopted, and the slurry is used to seal the cracks from top to bottom. During construction, the length of the sectioned stop plug, the number of sections, and the grouting length of each section can be adjusted according to the actual working conditions.

[0105] In this embodiment, cement-based grouting material is used. Ordinary pure cement grouting cannot be tested indoors, and other cement-based grouting should be selectively tested for performance. The selection principles of grouting materials mainly include pourability, durability and environmental protection. The types, properties and quantities of admixtures and additives added to various groutings should be determined through indoor grouting material tests and on-site grouting tests according to the project conditions and grouting purposes.

[0106] In this embodiment, the grouting pressure does not exceed 1MPa, and the conventional grouting water-cement ratio is preferably between 0.6-1.2. The cement slurry can be grouted with three ratios of 2:1, 1:1, and 0.6:1. In this embodiment, the grouting water-cement ratio is usually set to 2:1 when the injection is started. This is because there is no slurry in the grouting pipe when the grouting starts. If the concentration of the injected slurry is too high, the grouting pipe will be blocked, which will cause the work of the Pearl River to fail to proceed smoothly. Therefore, in the short time of the injection, low-concentration slurry should be used for grouting. How long does it take to grout with a slurry with a water-cement ratio of 2:1? It can be determined according to the grouting effect of the construction at the time. Then, the water-cement ratio of the slurry is continuously adjusted during the grouting, so that the slurry changes from dilute to concentrated step by step to complete the grouting work. When the weak zone or broken zone is injected, the water-cement ratio can start from 1:1, and then the water-cement ratio of the slurry is continuously adjusted during the grouting, so that the slurry changes from dilute to concentrated step by step to complete the grouting work.

[0107] In this embodiment, the amount of cement slurry injected per unit time and the injection speed are controlled during the grouting process. The injection speed can be determined by the pressure-speed curve and is preferably 5-20 L / min. Grouting can be terminated when the grouting pressure is not less than the designed final pressure, the injection rate is less than 0.05 L / min·m, and the grouting time lasts for at least 30 minutes.

[0108] After the grouting is completed, there is no need to set up inspection holes to check the grouting effect. Instead, the plan for additional grouting is determined directly based on the changes in the amount of water leakage on the current step. The grouting process is a process of continuous improvement until the amount of water leakage is less than the grouting requirements.

[0109] Preferably, in this embodiment, when grouting is implemented in the middle and lower steps, full-hole one-time grouting and segmented grouting can be adopted. The full-hole one-time grouting preferably adopts a large-circulation grouting method, and the segmented grouting is carried out according to the requirements of the segmented grouting.

[0110] Preferably, implementing segmented grouting and plugging of each step by means of a grout stopper also includes:

[0111] After the grouting of each step is completed, the plan for additional grouting is determined based on the change in the amount of water leakage in the water-stopping area sealed by grouting behind the current step.

[0112] In the above method of the present embodiment, low-pressure grouting is carried out from top to bottom through the coordination of grouting holes, stop plugs and step-by-step segmented grouting, so as to avoid the problem that the surrounding rock cracks are easily fractured during high-pressure grouting, resulting in an increase in water gushing, and the slurry is easy to overflow from the shortest path. At the same time, a low-pressure grouting hole for the first step of the cavern is drilled in the water curtain tunnel, and the post-grouting of the first step is implemented. A low-pressure grouting hole for the next step of the cavern is drilled at the side wall position of the previous step of the cavern, and the post-grouting of the next step is implemented until all steps have been grouted. This solves the limitation problem that the existing underground water-sealed caverns are all grouted from the inside of the cavern, fully considers the influence of the fissure water infiltration path and the infiltration pressure on the grouting plugging, and adopts a top-down low-pressure grouting strategy to minimize the influence of the surrounding groundwater on the seepage control of the cavern.

[0113] Embodiment 2

[0114] Embodiment 2 of the present invention provides an underground water-sealed cavern grouting device, the structure of which is as follows: Figure 6 As shown, including:

[0115] The water stop area determination module 11 is used to determine the water stop area of ​​the first step of the cavern that needs to be plugged by post-grouting according to the hydrological monitoring data of the cavern; and to determine the water stop area of ​​the next step of the cavern that needs to be plugged by post-grouting according to the water discharge of the previous step of the cavern;

[0116] The hole position determination module 12 is used to arrange the first step post-grouting hole point in the water curtain tunnel on the upper layer of the water stop area blocked by post-grouting; and arrange the next step post-grouting hole point at the side wall position of the previous step;

[0117] The parameter determination module 13 is used to determine the drilling parameters of the first step rear grouting hole at the first step rear grouting hole point according to the layout of the cavern engineering, and to determine the drilling parameters of the next step rear grouting hole according to the layout of the side wall position of the previous step, so as to drill the rear grouting hole according to the drilling parameters, and the rear grouting hole is used for grouting plugging;

[0118] The control module 14 is used to control the operation of the water stop area determination module and the hole position determination module, by repeatedly executing the steps of determining the area of ​​the next step of the cavern that needs to be post-grouted and sealed for water stop according to the water discharge conditions of the previous step of the cavern, until all the steps of the cavern are grouted and sealed.

[0119] The underground water-sealed cavern grouting device in this embodiment can locate subsequent boreholes by arranging points to ensure the accuracy of the position during drilling, and adopts a top-down grouting method to reduce the difficulty of post-grouting water-stopping work in the cave, while ensuring the grouting sealing effect, avoiding the problem of high-pressure post-grouting pushing water in the surrounding rock fissures back into the upper fissures, shortening the construction time, ensuring the fluidity of the mud during grouting, and making the grouting work more convenient while ensuring sealing.

[0120] Regarding the underground water-sealed cavern grouting device in the above-mentioned embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the underground water-sealed cavern grouting method, and will not be elaborated here.

[0121] Embodiment 3

[0122] Embodiment 3 of the present invention provides an underground water-sealed cavern grouting system, the structure of which is as follows: Figure 7 As shown, including:

[0123] Drilling equipment 21, used for drilling post-grouting holes according to the determined post-grouting hole locations;

[0124] The grouting equipment 22 is used to implement grouting and plugging through the drilled post-grouting holes.

[0125] Underground water seal cavern grouting device 23.

[0126] Regarding the underground water-sealed cavern grouting system in the above-mentioned embodiment, the specific work performed by the devices and equipment has been described in detail in the embodiment of the underground water-sealed cavern grouting method, and will not be elaborated here.

[0127] Unless otherwise specifically stated, terms such as processing, computing, calculating, determining, displaying, etc. may refer to the actions and / or processes of one or more processing or computing systems, or similar devices, which operate and convert data represented as physical (e.g., electronic) quantities within registers or memories of a processing system into other data similarly represented as physical quantities within memories, registers, or other such information storage, transmission, or display devices of the processing system. Information and signals may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0128] It should be understood that the specific order or hierarchy of steps in the disclosed process is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of protection of the present disclosure. The attached method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy described.

[0129] In the above detailed description, various features are grouped together in a single embodiment to simplify the disclosure. This method of disclosure should not be interpreted as reflecting an intention that the embodiments of the claimed subject matter require more features than are clearly stated in each claim. On the contrary, as reflected in the appended claims, the invention is in a state of having less than all the features of the disclosed individual embodiments. Therefore, the appended claims are hereby expressly incorporated into the detailed description, with each claim standing on its own as a separate preferred embodiment of the invention.

[0130] Those skilled in the art will also appreciate that the various illustrative logic blocks, modules, circuits, and algorithmic steps described in conjunction with the embodiments herein can all be implemented as electronic hardware, computer software, or a combination thereof. In order to clearly illustrate the interchangeability between hardware and software, various illustrative components, blocks, modules, circuits, and steps are generally described above around their functions. Whether such functions are implemented as hardware or software depends on specific applications and the design constraints imposed on the entire system. A skilled person can implement the described functions in an alternative manner for each specific application, but such implementation decisions should not be interpreted as departing from the scope of protection of the present disclosure.

[0131] The steps of the method or algorithm described in conjunction with the embodiments herein may be directly embodied as hardware, a software module executed by a processor, or a combination thereof. The software module may be located in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a mobile disk, a CD-ROM, or any other form of storage medium well known in the art. An exemplary storage medium is connected to the processor so that the processor can read information from the storage medium and can write information to the storage medium. Of course, the storage medium may also be an integral part of the processor. The processor and the storage medium may be located in an ASIC. The ASIC may be located in a user terminal. Of course, the processor and the storage medium may also be present in a user terminal as discrete components.

[0132] For software implementation, the techniques described in this application can be implemented with modules (e.g., procedures, functions, etc.) that perform the functions described in this application. These software codes can be stored in a memory unit and executed by a processor. The memory unit can be implemented within the processor or outside the processor. In the latter case, it is coupled to the processor in a communication manner via various means, which are well known in the art.

[0133] The above description includes examples of one or more embodiments. Of course, it is impossible to describe all possible combinations of components or methods for the purpose of describing the above embodiments, but it should be recognized by those skilled in the art that the various embodiments may be further combined and arranged. Therefore, the embodiments described herein are intended to cover all such changes, modifications and variations that fall within the scope of protection of the appended claims. In addition, with respect to the term "comprising" used in the specification or claims, the word is covered in a manner similar to the term "including", just as "including," is explained as a transitional word in the claims. In addition, any term "or" used in the specification of the claims is intended to mean "non-exclusive or".

Claims

1. A method for grouting an underground water-sealed cavern, characterized in that: include: According to the hydrological monitoring data of the cavern, the water stop area of ​​the first step of the cavern that needs to be plugged by post-grouting is determined, and the post-grouting hole points of the first step are arranged in the water curtain roadway above the water stop area plugged by post-grouting; According to the arrangement of the cavern project, a first step rear grouting hole is drilled at the first step rear grouting hole point, and grouting and plugging of the first step is performed through the first step rear grouting hole; According to the water discharge of the previous step of the cavern, determine the water stop area of ​​the next step of the cavern that needs to be plugged by post-grouting, arrange the post-grouting hole points of the next step at the side wall of the previous step, and drill the post-grouting holes of the next step; After the grouting of the previous step of the cavern is completed, the grouting and plugging of the next step is carried out through the grouting hole behind the next step; Repeat the steps of determining the area of ​​the next step of the cavern that needs to be post-grouted and sealed to stop water according to the water outflow situation of the previous step of the cavern, until all the steps of the cavern are grouted and sealed.

2. The method according to claim 1, characterized in that The method of determining the water stop area of ​​the first step of the cavern that needs to be plugged by post-grouting according to the hydrological monitoring data of the cavern includes: Obtaining hydrological monitoring data of the cavern, the hydrological monitoring data including the water supply of each unit, the discharge, the water inflow of each unit, the water leakage at each location, the water supply of the water curtain hole, and any one of the pressure gauge hole data; After the cavern of the cavern is excavated, the water-stop tunnel sections of a specified length in the first step of the cavern where the water inflow exceeds the set water inflow threshold, as well as the water-stop tunnel sections within a specified distance range before and after the water outlet where the single-point water inflow exceeds the set water inflow threshold, are determined based on the hydrological monitoring data; the determined water-stop tunnel sections are used as the water-stop areas that need to be post-grouting sealed in the first step of the cavern.

3. The method according to claim 1, characterized in that The method of determining the area of ​​the next step of the cavern that needs to be post-grouted and sealed according to the water discharge of the previous step of the cavern includes: Check the water discharge from the upper step of the cavern; After the previous step is excavated, the water stop tunnel section with a specified length in the next step of the cavern where the water inflow exceeds the set water inflow threshold is determined according to the water outflow situation of the previous step of the cavern, as well as the water stop tunnel section within a specified distance range before and after the water outflow point where the single-point water inflow exceeds the set water inflow threshold; Determine the water stop hole section of the previous step where grouting has been implemented based on the grouting work of the previous step; The determined water stop tunnel section will be used as the water stop area for the next step of the tunnel that needs to be post-grouting and sealed.

4. The method according to claim 1, characterized in that The method of drilling the first step rear grouting hole at the first step rear grouting hole point according to the arrangement of the cavern engineering comprises: Calculate the hole inclination angle and drilling depth of the grouting hole behind the first step according to the arrangement of the water curtain tunnel and the cavern; Calculate the external insertion angle of the first step rear grouting hole according to the actual grouting contour line influence range and the rear grouting hole drilling depth; The first step rear grouting hole is drilled at the first step rear grouting hole point according to the hole inclination angle, drilling depth and external insertion angle of the first step rear grouting hole.

5. The method according to claim 1, characterized in that The method of arranging the grouting hole position of the next step at the side wall position of the previous step and drilling the grouting hole of the next step includes: According to the side wall position of the previous step and the structure of the cavern, calculate the hole inclination angle and drilling depth of the grouting hole behind the next step; Calculate the external insertion angle of the next step's rear grouting hole according to the actual grouting contour line influence range and the rear grouting hole drilling depth; The grouting hole behind the next step is drilled at the position of the grouting hole behind the next step according to the hole inclination angle, drilling depth and external insertion angle of the grouting hole behind the next step.

6. The method according to claim 4 or claim 5, characterized in that: Also includes: After the rear grouting holes of each step are drilled, the rear grouting holes are cleaned; the cleaning of the rear grouting holes includes washing the holes and removing debris in the holes; After the post-grouting hole is cleaned, a water pressure test is carried out to measure the hydrostatic pressure in the hole.

7. The method according to claim 1, characterized in that A grouting stopper is arranged in the rear grouting hole of each step, and the segmented grouting and plugging of each step is implemented through the grouting stopper.

8. The method according to claim 7, characterized in that The segmented grouting and plugging of each step is implemented by the grout stopper, including: Determine the number of sections for segmented grouting and the grouting length of each section according to the drilling depth of the grouting hole; The grouting pressure is determined according to the measured hydrostatic pressure and the grouting pressure does not exceed the preset pressure; According to the determined grouting pressure and the preset grouting slurry water-cement ratio parameters, the slurry is controlled to be injected into the rear grouting holes of the current step of the cavern at a preset injection speed and injection volume to seal the surrounding rock cracks in the water-stopping area of ​​the rear grouting of the current step of the oil storage cavern.

9. The method according to claim 8, characterized in that Also includes: After the grouting of each step is completed, the plan for additional grouting is determined based on the change in the amount of water leakage in the water-stopping area sealed by grouting behind the current step.

10. An underground water-sealed cavern grouting device, characterized in that: include: A water stop area determination module is used to determine the water stop area of ​​the first step of the cavern that needs to be post-grouted and plugged according to the hydrological monitoring data of the cavern; And according to the water discharge of the previous step of the cavern, determine the area of ​​the next step of the cavern that needs to be sealed by post-grouting; A hole position determination module is used to arrange the first step post-grouting hole positions in the water curtain roadway on the upper layer of the water stop area blocked by post-grouting; And arrange the grouting hole points behind the next step at the side wall position of the previous step; A parameter determination module is used to determine the drilling parameters of the first step rear grouting hole at the first step rear grouting hole point according to the layout of the cavern project, and to determine the drilling parameters of the next step rear grouting hole according to the layout of the previous step side wall position, so as to drill the rear grouting hole according to the drilling parameters, and the rear grouting hole is used for grouting plugging; The control module is used to control the operation of the water-stop area determination module and the hole position determination module, by repeatedly executing the steps of determining the area of ​​the next step of the cavern that needs to be post-grouting and water-stopping according to the water outflow situation of the previous step of the cavern, until all the steps of the cavern are grouting and sealed.

11. An underground water-sealed cavern grouting system, characterized in that: include: Drilling equipment, grouting equipment and the underground water-sealed cavern grouting device according to claim 10; Drilling equipment, used for drilling post-grouting holes according to the determined post-grouting hole locations; The grouting equipment is used to implement grouting and sealing through the drilled post-grouting holes.

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