Full weathered granite overburden layering grouting method and device based on adaptive frequency conversion, electronic equipment and non-transient computer readable storage medium

Abstract

The application discloses a full-strong weathered granite covering layer layered grouting method and device based on adaptive frequency conversion, electronic equipment and a non-transient computer readable storage medium, and belongs to the technical field of rock soil grouting. The full-strong weathered granite covering layer layered grouting method based on adaptive frequency conversion comprises the following steps: obtaining a full-strong weathered granite sample, jointly analyzing the full-strong weathered granite sample based on geological exploration and water pressure test, and obtaining the weathering degree of the full-strong weathered granite sample; dividing the full-strong weathered granite sample based on the weathering degree to obtain different grouting units; using grouting materials and water-cement ratios with different particle sizes to perform staged and progressive adaptive frequency conversion grouting on each grouting unit based on an adaptive frequency conversion grouting model; and when the grouting is completed, sealing holes of each grouting unit to obtain the full-strong weathered granite sample after layered grouting. The method improves the efficiency and accuracy of full-strong weathered granite grouting.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rock and soil grouting, and particularly relates to a full-strong weathered granite overburden layer layered grouting method and device based on adaptive frequency conversion, an electronic device, and a non-transitory computer readable storage medium. BACKGROUND

[0002] When grouting in full-strong weathered granite strata, due to the spherical weathering characteristics of granite, differential weathering causes the strata to have both micro-fissure leakage channels with dense lithology and developed weathering fissures, and large-pore leakage channels such as weathered interlayers and fault fractures, which causes problems such as water absorption without grout absorption, difficulty in grouting of cement grout, repeated splitting of grout along weak surfaces, large grout consumption, uncontrollable grout, and large leakage after seepage prevention treatment.

[0003] Conventional grouting technology usually sets the grouting pressure to three fixed levels. This rough pressure control mode has significant defects: when the pressure is too low, the grout is difficult to break through the resistance of the rock-soil medium, resulting in insufficient diffusion radius; and when the pressure is too high, the grout is easy to form dominant flow along the weathering fissures, faults and other leakage channels, which cannot accurately control the direction of pressure injection and is difficult to achieve uniform diffusion. Moreover, this technology does not design for the physical property differences of weathered layers - the same type of grout cannot simultaneously achieve effective penetration of micro-fissures and reliable plugging of large pores, which will directly lead to frequent construction abnormalities such as hole collapse and grout eruption. In addition, due to the lack of dynamic coupling regulation mechanism for grouting pressure and flow, the formed seepage prevention body often has problems such as poor continuity and insufficient density due to the mismatch between grouting parameters and strata characteristics, which seriously affects the grouting reinforcement effect. The existing technology has the problems of low grouting accuracy, uneven grout diffusion distance, and easy grout leakage and eruption in the process of grouting in full-strong weathered granite overburden layer. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a full-strong weathered granite overburden layer layered grouting method and device based on adaptive frequency conversion, which effectively improves the grouting filling efficiency, filling effect and ground deformation control effect, and reduces the grout eruption rate and grouting cost.

[0005] In a first aspect, the present application provides a full-strong weathered granite overburden layer layered grouting method based on adaptive frequency conversion, the method comprising:

[0006] Obtaining a full-strong weathered granite sample, performing joint analysis on the full-strong weathered granite sample based on geological exploration and water pressure test to obtain the weathering degree of the full-strong weathered granite sample;

[0007] Based on the weathering degree, the full strong weathering granite sample is divided to obtain different grouting units, and the grouting unit includes residual soil layer, full weathering layer, strong weathering layer and medium weathering layer;

[0008] Based on the adaptive frequency conversion grouting model, different particle sizes and water-cement ratios of grouting materials are used for phased and progressive adaptive frequency conversion grouting of each grouting unit. The adaptive frequency conversion grouting model includes a data measurement module, a data analysis module and an adaptive frequency conversion grouting module. The data measurement module is used to collect the grouting pressure, grouting quantity and ground uplift deformation data of the full strong weathering granite sample and send them to the data analysis module. The data analysis module is used to calculate the grouting pressure change rate, ground uplift displacement and GIN value based on the grouting pressure, grouting quantity and ground uplift deformation data of the full strong weathering granite sample. Based on the threshold values of the grouting pressure change rate, ground uplift displacement and GIN value, different grouting instructions are obtained and sent to the adaptive frequency conversion grouting module. The adaptive frequency conversion grouting module is used to use different particle sizes of grouting materials for different grouting units, use grouting materials with decreasing water-cement ratios for the same grouting unit according to the grouting sequence of the initial stage, one or more intermediate stages and the final hole stage, adjust the motor frequency of the frequency conversion grouting pump through the frequency converter based on the preset threshold values of the grouting pressure change rate, ground uplift displacement and GIN value, control the grouting flow and pressure, and perform phased and progressive adaptive frequency conversion grouting on each grouting unit.

[0009] When the grouting is completed, the hole of each grouting unit is sealed to obtain the full strong weathering granite sample after layered grouting.

[0010] According to an embodiment of the present application, based on the adaptive frequency conversion grouting model, different particle sizes and water-cement ratios of grouting materials are used for phased and progressive adaptive frequency conversion grouting of each grouting unit, including:

[0011] The data analysis module is used to judge whether the grouting pressure change rate is greater than or equal to the first preset threshold value. When the grouting pressure change rate is greater than or equal to the preset threshold value, the first grouting instruction is obtained, which is to switch to the parameter of the previous grouting stage and maintain the operation with 50% of the grouting pressure and grouting quantity of the stage until the cumulative GIN value reaches 25% of the GIN value target value of the current stage to restore the original stage parameter. When the grouting pressure change rate is less than the first preset threshold value, the second grouting instruction is obtained, which is to maintain the current grouting parameter for continuous operation. The first grouting instruction and the second grouting instruction are sent to the adaptive frequency conversion grouting module. The adaptive frequency conversion grouting module performs phased and progressive adaptive frequency conversion grouting on each grouting unit according to the first grouting instruction and the second grouting instruction.

[0012] According to one embodiment of the present application, the adaptive frequency conversion grouting model is used to adopt different particle sizes and water-cement ratios of grouting materials for phased and progressive adaptive frequency conversion grouting of each grouting unit, further comprising:

[0013] The data analysis module is used to determine whether the stratum uplift displacement is greater than or equal to the second preset threshold value. When the stratum uplift displacement is greater than or equal to the second preset threshold value, a third grouting instruction is obtained, and the third grouting instruction is to immediately stop the grouting operation and resume the grouting after the grout initial setting. When the stratum uplift displacement is less than the second preset threshold value, a second grouting instruction is obtained, and the second grouting instruction is to maintain the current grouting parameters for continuous operation. The second grouting instruction and the third grouting instruction are sent to the adaptive frequency conversion grouting module, and the adaptive frequency conversion grouting module performs phased and progressive adaptive frequency conversion grouting on each grouting unit according to the second grouting instruction and the third grouting instruction.

[0014] According to one embodiment of the present application, the adaptive frequency conversion grouting model is used to adopt different particle sizes and water-cement ratios of grouting materials for phased and progressive adaptive frequency conversion grouting of each grouting unit, further comprising:

[0015] The data analysis module is used to determine whether the GIN value reaches the third preset threshold value. When the GIN value reaches the third preset threshold value, it is determined whether the grouting unit is in the final hole stage. If the grouting unit is in the final hole stage, a fourth grouting instruction is obtained, and the fourth grouting instruction is to terminate the grouting operation. If the grouting unit is not in the final hole stage, a fifth grouting instruction is obtained, and the fifth grouting instruction is to enter the next grouting stage. The fourth grouting instruction and the fifth grouting instruction are sent to the adaptive frequency conversion grouting module, and the adaptive frequency conversion grouting module performs phased and progressive adaptive frequency conversion grouting on each grouting unit according to the fourth grouting instruction and the fifth grouting instruction.

[0016] According to one embodiment of the present application, different third preset threshold values are used in different grouting stages. The third preset threshold values of each grouting stage in the fully weathered layer are determined through field grouting tests. The third preset threshold values of each grouting stage in the residual soil layer, the strongly weathered layer and the moderately weathered layer are corrected based on the preset threshold value of the GIN value of the fully weathered layer and the SPT-N value obtained from the standard penetration test.

[0017] According to one embodiment of the present application, when the grouting is completed, each grouting unit is sealed to obtain a fully weathered and strongly weathered granite sample after layered grouting, comprising:

[0018] When the grouting is completed, the data analysis module sends a sealing instruction to the frequency conversion grouting pump. The sealing instruction is to inject cement-bentonite paste grout with a water-cement ratio of 0.5:1 and a bentonite content of 30% for in-hole grout replacement. The replacement process lasts for 30 minutes. Based on the sealing instruction, each grouting unit is sealed to obtain a fully weathered and strongly weathered granite sample after layered grouting.

[0019] According to one embodiment of the present application, the full weathered granite sample is divided based on the weathering degree, and different grouting units are obtained, including:

[0020] The standard penetration test is performed on the full weathered granite sample, and the standard penetration test blows are obtained; the weathering degree of different parts of the full weathered granite sample is obtained based on the standard penetration test blows, the weathering degree of the part with the standard penetration test blows less than 30 is low weathering degree, the weathering degree of the part with the standard penetration test blows greater than or equal to 30 and less than 50 is full weathering degree, the weathering degree of the part with the standard penetration test blows greater than or equal to 50 and less than 200 is strong weathering degree, and the weathering degree of the part with the standard penetration test blows greater than or equal to 200 is medium weathering degree; the full weathered granite sample is divided based on the weathering degree, the part with the low weathering degree is set as a residual soil layer grouting unit, the part with the full weathering degree is set as a full weathering layer grouting unit, the part with the strong weathering degree is set as a strong weathering layer grouting unit, and the part with the medium weathering degree is set as a medium weathering layer grouting unit.

[0021] In a second aspect, the present application provides a full weathered granite covering layer layered grouting device based on adaptive frequency conversion, the device comprising:

[0022] The acquisition module is configured to acquire a full weathered granite sample, and perform joint analysis on the full weathered granite sample based on geological exploration and water pressure test to obtain the weathering degree of the full weathered granite sample.

[0023] The first processing module is configured to divide the full weathered granite sample based on the weathering degree to obtain different grouting units, and the grouting units include a residual soil layer, a full weathering layer, a strong weathering layer, and a medium weathering layer.

[0024] The second processing module is configured to perform phased and progressive adaptive frequency conversion grouting on each grouting unit by using grouting materials with different particle sizes and water-cement ratios based on the adaptive frequency conversion grouting model.

[0025] The hole sealing module is configured to seal the holes of each grouting unit when the grouting is completed to obtain the full weathered granite sample after layered grouting.

[0026] In a third aspect, the present application provides an electronic device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the full weathered granite covering layer layered grouting method based on adaptive frequency conversion of the first aspect when executing the computer program.

[0027] In a fourth aspect, the application provides a non-transitory computer-readable storage medium having stored thereon a computer program, which, when executed by a processor, implements the adaptive frequency conversion-based full-strong weathered granite overburden layer grouting method according to the first aspect.

[0028] Additional aspects and advantages of the application will be made apparent by the following description and the appended claims.

[0029] The adaptive frequency conversion-based full-strong weathered granite overburden layer grouting method provided by the application has the following beneficial effects relative to the prior art:

[0030] (1) The application obtains full-strong weathered granite samples and performs joint analysis, combines permeability data and weathering degree, and divides different grouting units according to the weathering degree, optimizes different particle size gradation slurries for different horizons for grouting, uses an adaptive frequency conversion grouting model, flexibly adjusts and controls grouting parameters according to the characteristics of each weathering layer, effectively improves grouting filling efficiency, filling effect, and surface deformation control effect, and reduces grouting cost and grouting rate.

[0031] (2) The application determines whether the GIN value reaches a third preset threshold value through the data analysis module, and generates fourth and fifth grouting instructions according to the determination result, thereby realizing frequency conversion control of the grouting process. When the GIN value reaches the third preset threshold value and the grouting unit is in the final hole stage, an instruction to terminate the grouting operation is generated; if it is not in the final hole stage, it enters the next grouting stage, improves the automation and flexibility of the grouting operation, reduces resource waste, improves the permeability, stability, and mechanical properties of full-strong weathered granite, adjusts the grouting pump power on demand through frequency conversion technology, realizes high-precision control of grouting pressure, reduces energy consumption and comprehensive engineering cost, and reduces site occupancy rate.

[0032] (3) The application acquires grouting pressure, grouting volume, and formation heave deformation data of the full-strong weathered granite sample in real time through the data measurement module, and sends them to the data analysis module. The data analysis module calculates the grouting pressure change rate, formation heave displacement, and GIN value based on the acquired data, generates different grouting instructions, and transmits them to the adaptive frequency conversion grouting module. The adaptive frequency conversion grouting module adjusts the motor frequency of the frequency conversion grouting pump through the frequency converter according to the grouting instructions, controls the grouting flow and pressure, and uses grouting materials with different particle sizes and water-cement ratios for phased and progressive grouting of each grouting unit, realizes the "sensing-analysis-execution" closed-loop logic, can monitor the grouting pressure, flow, and GIN value in real time, dynamically adjusts the frequency converter parameters, effectively reduces the grouting cost and grouting rate, and improves the grouting accuracy and reliability. BRIEF DESCRIPTION OF DRAWINGS

[0033] The above and / or additional aspects and advantages of the present application will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings in which:

[0034] Figure 1 is one of the flow schematic diagrams of the full weathered granite covering layer layering grouting method based on adaptive frequency conversion provided by the embodiments of the present application;

[0035] Figure 2 is a structural schematic diagram of the full weathered granite sample layering provided by the embodiments of the present application;

[0036] Figure 3 is the second flow schematic diagram of the full weathered granite covering layer layering grouting method based on adaptive frequency conversion provided by the embodiments of the present application;

[0037] Figure 4 is a structural schematic diagram of the full weathered granite covering layer layering grouting device based on adaptive frequency conversion provided by the embodiments of the present application;

[0038] Figure 5 is a structural schematic diagram of the electronic device provided by the embodiments of the present application. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described clearly below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0040] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually a category, not limited to the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0041] The full weathered granite covering layer layering grouting method based on adaptive frequency conversion, the full weathered granite covering layer layering grouting device based on adaptive frequency conversion, the electronic device and the readable storage medium provided by the embodiments of the present application will be described in detail below in conjunction with the drawings and specific embodiments and their application scenarios.

[0042] Among them, the layered grouting method for fully weathered granite overburden based on adaptive frequency conversion can be applied to the terminal, and can be executed by the hardware or software in the terminal.

[0043] The terminal includes, but is not limited to, portable communication devices such as mobile phones or tablets with touch-sensitive surfaces (e.g., touchscreen displays and / or touchpads). It should also be understood that, in some embodiments, the terminal may not be a portable communication device, but rather a desktop computer with touch-sensitive surfaces (e.g., touchscreen displays and / or touchpads). However, it should be understood that the terminal may include one or more other physical user interface devices such as a physical keyboard, mouse, and joystick.

[0044] The layered grouting method for fully weathered granite overburden based on adaptive frequency conversion provided in this application embodiment can be executed by an electronic device or a functional module or entity within an electronic device capable of implementing the layered grouting method for fully weathered granite overburden based on adaptive frequency conversion. The electronic devices mentioned in this application embodiment include, but are not limited to, mobile phones, tablets, computers, cameras, and wearable devices. The following description uses an electronic device as the execution subject to illustrate the layered grouting method for fully weathered granite overburden based on adaptive frequency conversion provided in this application embodiment.

[0045] Figure 1 This is one of the flowcharts illustrating the layered grouting method for fully weathered granite overburden based on adaptive frequency conversion provided in this application embodiment, such as... Figure 1 As shown, the layered grouting method for fully weathered granite overburden based on adaptive frequency conversion includes the following steps:

[0046] Step 110: Obtain fully weathered granite samples. Based on geological exploration and water pressure tests, conduct joint analysis on the fully weathered granite samples to obtain permeability data and weathering degree of the fully weathered granite samples.

[0047] Step 120: Divide the fully weathered granite samples according to their weathering degree to obtain different grouting units. The grouting units include residual soil layer, fully weathered layer, strongly weathered layer and moderately weathered layer.

[0048] In some embodiments, the fully weathered granite samples are divided based on their degree of weathering to obtain different grouting units, including:

[0049] Standard penetration tests were performed on fully weathered granite samples to obtain the standard penetration test blow counts.

[0050] The weathering degree of different parts of the fully weathered granite sample was obtained based on the standard penetration test (SPT) blow count. The weathering degree of the part with a SPT blow count of less than 30 was low weathering, the weathering degree of the part with a SPT blow count of 30 or more but less than 50 was full weathering, the weathering degree of the part with a SPT blow count of 50 or more but less than 200 was strong weathering, and the weathering degree of the part with a SPT blow count of 200 or more was moderate weathering.

[0051] Based on the degree of weathering, the fully weathered granite samples were divided into three groups: the low-weathered portion was designated as the residual soil grouting unit, the fully weathered portion as the fully weathered layer grouting unit, the strongly weathered portion as the strongly weathered layer grouting unit, and the moderately weathered portion as the moderately weathered layer grouting unit.

[0052] Figure 2 This is a schematic diagram of the layered structure of a fully weathered granite sample provided in an embodiment of this application, as shown below. Figure 2 As shown, different particle sizes of grouting materials are used for different grouting units. For example, the residual soil layer grouting unit injects early-strength micro-fine cement-based grout with a particle size ≤0.5mm; the fully weathered layer grouting unit injects early-strength cement-bentonite composite grout containing 2-3mm graded aggregate with a bentonite content of 10%; the strongly weathered layer grouting unit injects early-strength cement-bentonite composite grout containing 3-5mm graded coarse aggregate with a bentonite content of 20%; and the moderately weathered layer grouting unit injects early-strength cement-bentonite composite grout containing 5-8mm graded extra-coarse aggregate and water glass activator with a water glass content of 3%-5% and a bentonite content of 30%.

[0053] It should be noted that bentonite can be a locally sourced material for modifying weathered layers. After screening to remove coarse particles with a diameter >2mm, it can be directly mixed into the slurry, reducing the amount of purchased materials to be transported and temporarily stockpiled, thereby reducing project costs and site occupation.

[0054] In this embodiment, the degree of weathering of different parts of the fully weathered granite sample is determined by the standard penetration test. Based on the degree of weathering, grouting units at different levels are divided. Different particle size gradations of grout can be selected for grouting of different grouting units, which improves the targeting and effectiveness of grouting operations, better meets the needs of complex strata reinforcement, reduces the risk of hole collapse, and reduces resource waste.

[0055] Step 130: Based on the adaptive frequency conversion grouting model, grouting materials with different particle sizes and water-cement ratios are used to perform staged progressive adaptive frequency conversion grouting on each grouting unit.

[0056] In some embodiments, the adaptive variable frequency grouting model comprises a data measurement module, a data analysis module and an adaptive variable frequency grouting module. The data measurement module is used to collect the grouting pressure, grouting volume and stratum uplift deformation data of the fully weathered granite sample and send them to the data analysis module; the data analysis module is used to calculate the grouting pressure change rate, stratum uplift displacement and GIN value according to the grouting pressure, grouting volume and stratum uplift deformation data of the fully weathered granite sample, obtain different grouting instructions based on the threshold values of the grouting pressure change rate, stratum uplift displacement and GIN value, and send them to the adaptive variable frequency grouting module; the adaptive variable frequency grouting module is used to adjust the motor frequency of the variable frequency grouting pump through the frequency converter according to the grouting instructions, control the grouting flow and pressure, and perform phased and progressive adaptive variable frequency grouting on each grouting unit using grouting materials with different particle sizes and water-cement ratios.

[0057] In some embodiments, the adaptive variable frequency grouting model uses grouting materials with different particle sizes and water-cement ratios to perform layered adaptive variable frequency grouting on each grouting unit, comprising:

[0058] The data analysis module is used to determine whether the grouting pressure change rate is greater than or equal to the first preset threshold value. When the grouting pressure change rate is greater than or equal to the preset threshold value, the first grouting instruction is obtained, which is to switch to the last grouting stage parameter and maintain the operation with 50% of the grouting pressure and grouting volume of the stage until the cumulative GIN value reaches 25% of the target value of the current stage GIN value to restore the original stage parameter. When the grouting pressure change rate is less than the first preset threshold value, the second grouting instruction is obtained, which is to maintain the current grouting parameter for continuous operation. The first grouting instruction and the second grouting instruction are sent to the adaptive variable frequency grouting module, and the adaptive variable frequency grouting module performs phased and progressive adaptive variable frequency grouting on each grouting unit according to the first grouting instruction and the second grouting instruction.

[0059] The first preset threshold value is determined by field grouting test according to the engineering grade, geological conditions of grouting site, etc.

[0060] Each grouting unit comprises an initial grouting stage, a first-stage grouting stage, a second-stage grouting stage and a final hole stage.

[0061] The data measurement module comprises a pressure sensor, a flowmeter and a stratum uplift measuring instrument. The pressure sensor is responsible for real-time recording of grouting pressure, the flowmeter is responsible for real-time recording of grouting flow, and the stratum uplift measuring instrument is responsible for real-time recording of stratum uplift deformation.

[0062] For example, the data analysis module connects the data measurement module and the adaptive frequency conversion grouting module through wireless transmission. The data measurement module collects the grouting pressure data in real time and sends it to the data analysis module. The data analysis module calculates the grouting pressure change rate K based on the grouting pressure data in real time. When K≥±0.1 MPa / 5 minutes (K is a negative number, and the absolute value is taken), the first grouting instruction is sent to the adaptive frequency conversion grouting module: switch to the last grouting stage parameter (if in the initial stage, keep the initial stage unchanged), and maintain the operation at 50% of the grouting pressure and the grouting amount of the stage until the cumulative GIN (Grouting Intensity Number, grouting intensity value) value reaches 25% of the target value of the current stage GIN value, and then the original stage parameter is restored. When K<±0.1 MPa / 5 minutes (K is a negative number, and the absolute value is taken), the second grouting instruction is sent: keep the current grouting parameter and continue the operation. The calculation formulas of the GIN value and the grouting pressure change rate are as follows:

[0063]

[0064] wherein, is the final grouting pressure, is the final grouting amount per meter of the grouting section, K is the grouting pressure change rate, is the grouting pressure difference, is the used time.

[0065] In this embodiment, the data analysis module determines whether the grouting pressure change rate is greater than a first preset threshold value, and generates the first and second grouting instructions according to the determination result. When the formation grouting pressure change rate is greater than or equal to the preset threshold value, the instruction to switch to the last grouting stage is generated, and the grouting pressure and the grouting amount of 50% of the stage are maintained until the GIN value reaches 25% of the target value of the current stage GIN value, and then the original stage parameter is restored. When the grouting pressure change rate is less than the first preset threshold value, the instruction to keep the current grouting parameter and continue the operation is generated. By monitoring the real-time change of the grouting pressure in real time, the automation and flexibility of the grouting operation are improved, the grouting filling efficiency, the filling effect, and the surface deformation control effect are effectively improved, and the grouting cost and the grouting rate are reduced.

[0066] In some embodiments, the adaptive frequency conversion grouting model uses grouting materials with different particle sizes and water-cement ratios for phased and progressive adaptive frequency conversion grouting of each grouting unit, and further includes:

[0067] The data analysis module determines whether the stratum uplift displacement is greater than or equal to a second preset threshold value. When the stratum uplift displacement is greater than or equal to the second preset threshold value, a third grouting instruction is obtained, and the third grouting instruction is to immediately stop the grouting operation and resume the grouting after the grout initial setting. When the stratum uplift displacement is less than the second preset threshold value, a second grouting instruction is obtained, and the second grouting instruction is to maintain the current grouting parameters for continuous operation. The second grouting instruction and the third grouting instruction are sent to the adaptive variable frequency grouting module. The adaptive variable frequency grouting module performs phased and progressive adaptive variable frequency grouting on each grouting unit according to the second grouting instruction and the third grouting instruction.

[0068] The second preset threshold value is determined by field grouting test according to engineering grade, geological conditions of grouting site, etc.

[0069] For example, the data measurement module collects stratum uplift deformation monitoring data in real time and sends the data to the data analysis module. The data analysis module analyzes the uplift displacement in real time based on the stratum uplift deformation monitoring data. When the uplift displacement is greater than or equal to 5 mm, the adaptive variable frequency grouting module is sent a third grouting instruction to immediately stop the grouting operation and resume the grouting after the grout initial setting. If the displacement is less than 5 mm, a second grouting instruction is sent to maintain the current grouting parameters for continuous operation.

[0070] In this embodiment, the data analysis module determines whether the stratum uplift displacement is greater than or equal to a second preset threshold value, and generates second and third grouting instructions according to the determination result. When the stratum uplift displacement is greater than or equal to the second preset threshold value, an instruction to stop the grouting operation and resume the grouting after the grout initial setting is generated. When the uplift displacement is less than the second preset threshold value, the current grouting parameters are maintained for continuous operation. By monitoring the stratum uplift in real time, the potential risks caused by the stratum uplift are reduced. The matching of the grout permeability, filling density and stratum strength requirement is achieved.

[0071] In some embodiments, the adaptive variable frequency grouting model uses grouting materials with different particle sizes and water-cement ratios to perform phased and progressive adaptive variable frequency grouting on each grouting unit. It also includes:

[0072] The data analysis module determines whether the GIN value reaches a third preset threshold value. When the GIN value reaches the third preset threshold value, it is determined whether the grouting unit is in the final hole stage. If the grouting unit is in the final hole stage, a fourth grouting instruction is obtained, and the fourth grouting instruction is to terminate the grouting operation. If the grouting unit is not in the final hole stage, a fifth grouting instruction is obtained, and the fifth grouting instruction is to enter the next grouting stage. The fourth grouting instruction and the fifth grouting instruction are sent to the adaptive variable frequency grouting module. The adaptive variable frequency grouting module performs phased and progressive adaptive variable frequency grouting on each grouting unit according to the fourth grouting instruction and the fifth grouting instruction.

[0073] For example, the data measurement module collects the grouting pressure and grouting quantity data in real time and sends them to the data analysis module. The data analysis module calculates the GIN value in real time based on the grouting pressure and grouting quantity data, judges whether the GIN value reaches the third preset threshold value, when the GIN value reaches the third preset threshold value, judges whether the grouting unit is in the final hole stage, if the grouting unit is in the final hole stage, obtains the fourth grouting instruction, the fourth grouting instruction is to terminate the grouting operation, if the grouting unit is not in the final hole stage, obtains the fifth grouting instruction, the fifth grouting instruction is to enter the next grouting stage.

[0074] It should be noted that different third preset threshold values are used in different grouting stages, and the third preset threshold values can be obtained through field grouting test.

[0075] In some embodiments, for the full weathered layer, the third preset threshold values of the initial stage, the first stage, the second stage and the final hole stage are determined through field grouting test according to engineering grade, geological conditions of grouting position and the like. The calculation formula of the GIN value of the full weathered layer is as follows:

[0076] GIN full weathered layer = GIN initial stage + GIN first stage + GIN second stage + GIN final hole stage

[0077] The GIN values of the residual soil layer, the strong weathered layer and the medium weathered layer are corrected based on the GIN value of the full weathered layer, and the calculation formula is as follows:

[0078] GIN residual soil layer = k 1GIN full weathered layer

[0079] GIN strong weathered layer = k 2GIN full weathered layer

[0080] GIN medium weathered layer = k 3GIN full weathered layer

[0081] Wherein, k 1, k 2, k 3 are correction coefficients of the GIN values of the residual soil layer, the strong weathered layer and the medium weathered layer based on the GIN value of the full weathered layer. k 1, k 2, k 3 are obtained by the following steps:

[0082] (1) The SPT-N values of the residual soil layer, the full weathered layer, the strong weathered layer and the medium weathered layer after drilling are obtained by standard penetration test, and are respectively N 1, N 0, N 2, N 3;

[0083] (2) The correction coefficient is calculated based on the full weathered layer value N0:

[0084]

[0085] wherein i is 1, 2, or 3.

[0086] Exemplarily, N 0 is 40, N 1, N 2, N 3 are 30, 125, and 200 respectively, and the expression is substituted k i The expression is calculated to obtain k 1, k 2, k 3 are 0.86, 1.38, and 1.56 respectively:

[0087] GIN residual soil layer = 0.86GIN full weathered layer = 0.86(GIN initial stage + GIN first stage + GIN second stage + GIN final hole stage)

[0088] GIN strong weathered layer = 1.38GIN full weathered layer = 1.38(GIN initial stage + GIN first stage + GIN second stage + GIN final hole stage)

[0089] GIN medium weathered layer = 1.56GIN full weathered layer = 1.56(GIN initial stage + GIN first stage + GIN second stage + GIN final hole stage)

[0090] Therefore, the preset threshold values of each grouting stage of the residual soil layer, the strong weathered layer, and the medium weathered layer are obtained by correcting the GIN value of the full weathered layer and the SPT-N value obtained by the standard penetration test.

[0091] The adaptive variable frequency grouting module realizes high-precision constant speed control of the variable frequency grouting pump through the SAJ frequency converter, timely adjusts the grouting pressure and grouting amount parameters, and the grouting pressure control precision error is ≤±2%.

[0092] In this embodiment, whether the GIN value reaches the third preset threshold value is judged by the data analysis module, and the fourth and fifth grouting instructions are generated according to the judgment result, realizing variable frequency control of the grouting process. When the GIN value reaches the third preset threshold value and the grouting unit is in the final hole stage, the instruction to terminate the grouting operation is generated; if it is not in the final hole stage, it enters the next grouting stage, improves the automation and flexibility of the grouting operation, reduces resource waste, improves the permeability, stability, and mechanical properties of the full strong weathered granite, adjusts the grouting pump power on demand through the variable frequency technology, realizes high-precision control of the grouting pressure, reduces energy consumption and comprehensive engineering cost, and reduces the site occupancy rate.

[0093] Figure 3 is a flowchart of the second embodiment of the method for full weathered granite overburden layer grouting provided by the application, as shown in the figure, for different grouting units, four water-cement ratios of 3:1, 2:1, 1:1 and 0.5:1 are adopted, and the grouting stage is divided into initial stage, first stage, second stage and final hole stage according to the water-cement ratio. Figure 3

[0094] In the process of "residual soil layer reinforcement", early strength micro-fine cement-based slurry with a particle size of ≤0.5 mm is injected, and through a staged progressive control strategy, it is gradually advanced in the order of "initial→first→second→final hole", and the specific process is as follows:

[0095] Initial stage:

[0096] Slurry: early strength micro-fine cement-based slurry with a particle size of ≤0.5 mm, water-cement ratio of 3:1 dilute slurry, to ensure fluidity and fill loose pores.

[0097] Parameters: pressure 0.1-0.2 MPa, flow rate 40 L / min.

[0098] Switching:

[0099] 1. When K≥±0.1 MPa / 5 minutes (K is negative, take the absolute value), keep the initial stage unchanged, and maintain the operation with 50% of the grouting pressure and grouting amount of the stage until the cumulative GIN value reaches 25% of the target value of the current stage GIN value, and then enter the next stage;

[0100] 2. When the lifting displacement is ≥5 mm, immediately stop the grouting operation and resume the grouting after the slurry is initially set;

[0101] 3. When the measured GIN value reaches 480 bar·L / m, the first grouting stage can be entered.

[0102] First stage:

[0103] Slurry: unchanged particle size, water-cement ratio adjusted to 2:1, increased viscosity to block hidden pores.

[0104] Parameters: pressure increased to 0.2-0.3 MPa, flow rate 20-25 L / min.

[0105] Switching:

[0106] 1. When K≥±0.1 MPa / 5 minutes (K is negative, take the absolute value), switch to the previous grouting stage, and maintain the operation with 50% of the grouting pressure and grouting amount of the stage until the cumulative GIN value reaches 25% of the target value of the current stage GIN value, and then enter the next stage;

[0107] ​2. When the lifting displacement is ≥5 mm, immediately stop the grouting operation and resume grouting after the slurry is initially cured.

[0108] 3. When the leakage of slurry occurs, inject the quick-setting agent and adjust the pressure back to 0.1 MPa.

[0109] 4. When the measured GIN value reaches 540 bar·L / m, enter the secondary grouting stage.

[0110] Secondary stage:

[0111] Slurry: The particle size remains unchanged, the water-cement ratio is 1:1, and both permeability and consolidation strength are considered.

[0112] Parameters: Pressure 0.3-0.4 MPa, flow rate 25 L / min.

[0113] Risk control: Allowable controlled leakage ≤0.3 L / min.

[0114] Switching:

[0115] 1. When K≥±0.1 MPa / 5 minutes (K is negative, take the absolute value), switch to the previous grouting stage, and maintain the operation with 50% of the grouting pressure and grouting volume of that stage until the GIN value reaches 25% of the target value of the current stage, then enter the next stage.

[0116] 2. When the lifting displacement is ≥5 mm, immediately stop the grouting operation and resume grouting after the slurry is initially cured.

[0117] 3. When the measured GIN value reaches 700 bar·L / m, enter the final hole grouting stage.

[0118] Final hole stage:

[0119] Slurry: The particle size remains unchanged, the water-cement ratio is 0.5:1, and the residual pore is filled with high-concentration slurry.

[0120] Parameters: Constant pressure 0.4 MPa, flow rate 5 L / min.

[0121] Switching:

[0122] 1. When K≥±0.1 MPa / 5 minutes (K is negative, take the absolute value), switch to the previous grouting stage, and maintain the operation with 50% of the grouting pressure and grouting volume of that stage until the cumulative GIN value reaches 25% of the target value of the current stage, then enter the next stage.

[0123] 2. When the lifting displacement is ≥5 mm, immediately stop the grouting operation and resume grouting after the slurry is initially cured.

[0124] 3. When the measured GIN value reaches 400 bar·L / m, end the grouting operation.

[0125] In the process of "full weathering layer reinforcement", early strength cement-bentonite composite slurry containing 2-3 mm graded aggregate is injected, and through gradual segmented control strategy, it is pushed forward in the order of "initial→first→second→final hole", and the specific process is as follows:

[0126] Initial stage:

[0127] Slurry: aggregate particle size 2-3 mm, early strength cement-bentonite, water-cement ratio 3:1 dilute slurry, bentonite content 10%, to ensure fluidity and fill loose pores.

[0128] Parameters: pressure 0.2-0.3 MPa, flow rate 40 L / min.

[0129] Switch:

[0130] 1. When K≥±0.1 MPa / 5 min (K is negative, take the absolute value), keep the initial stage unchanged, and maintain the operation with 50% of the injection pressure and injection amount of the stage, until the cumulative GIN value reaches 25% of the target value of the current stage GIN value, then enter the next stage;

[0131] 2. When the lifting displacement is ≥5 mm, immediately stop the grouting operation and resume grouting after the slurry is initially set;

[0132] 3. When the measured GIN value reaches 670 bar·L / m, the first grouting stage can be entered.

[0133] First stage:

[0134] Slurry: unchanged particle size, water-cement ratio adjusted to 2:1, increased viscosity to block hidden pores.

[0135] Parameters: pressure increased to 0.3-0.4 MPa, flow rate 20-25 L / min.

[0136] Switch:

[0137] 1. When K≥±0.1 MPa / 5 min (K is negative, take the absolute value), switch to the previous grouting stage, and maintain the operation with 50% of the injection pressure and injection amount of the stage, until the cumulative GIN value reaches 25% of the target value of the current stage GIN value, then enter the next stage;

[0138] 2. When the lifting displacement is ≥5 mm, immediately stop the grouting operation and resume grouting after the slurry is initially set;

[0139] 3. When leakage and slurry appear around, inject quick-setting agent, and the pressure is adjusted back to 0.2 MPa.

[0140] 4. When the measured GIN value reaches 760 bar·L / m, the second grouting stage can be entered.

[0141] Secondary stage:

[0142] Slurry: particle size unchanged, water-cement ratio 1:1 thick slurry, considering both permeability and consolidation strength.

[0143] Parameters: pressure 0.4-0.6 MPa, flow rate 25 L / min.

[0144] Risk control: allow ≤0.4 L / min controllable leakage.

[0145] Switch:

[0146] 1. When K≥±0.1 MPa / 5 min (K is negative, take the absolute value), switch to the previous grouting stage, and maintain the operation at 50% of the grouting pressure and grouting volume of that stage until the cumulative GIN value reaches 25% of the target value of the current stage, and then enter the next stage.

[0147] 2. When the lifting displacement is ≥5 mm, immediately stop the grouting operation and resume grouting after the slurry has initially set.

[0148] 3. When the measured GIN value reaches 980 bar·L / m, enter the final hole grouting stage.

[0149] Final hole stage:

[0150] Slurry: particle size unchanged, water-cement ratio 0.5:1 high-concentration slurry, filling residual pores.

[0151] Parameters: constant pressure 0.6 MPa, flow rate 5 L / min.

[0152] Termination:

[0153] 1. When K≥±0.1 MPa / 5 min (K is negative, take the absolute value), switch to the previous grouting stage, and maintain the operation at 50% of the grouting pressure and grouting volume of that stage until the cumulative GIN value reaches 25% of the target value of the current stage, and then enter the next stage.

[0154] 2. When the lifting displacement is ≥5 mm, immediately stop the grouting operation and resume grouting after the slurry has initially set.

[0155] 3. When the measured GIN value reaches 560 bar·L / m, end the grouting operation.

[0156] In the process of "strongly weathered layer reinforcement", early strength cement-bentonite composite slurry containing 3-5 mm coarse aggregate is injected, and through a gradual staged control strategy, it is gradually advanced in the order of "initial→ primary→ secondary→ final hole", and the specific process is as follows:

[0157] Initial stage:

[0158] Slurry: aggregate particle size 3-5 mm, early strength cement bentonite, water-cement ratio 3:1 thin slurry, bentonite content 20%, ensure fluidity, fill loose pores.

[0159] Parameters: pressure 0.3-0.4 MPa, flow rate 40 L / min.

[0160] Switch:

[0161] 1. When K≥±0.1 MPa / 5 min (K is negative, take the absolute value), keep the initial stage unchanged, and maintain the operation with 50% of the grouting pressure and grouting amount of the stage, until the cumulative GIN value reaches 25% of the target value of the current stage GIN value, then enter the next stage.

[0162] 2. When the lifting displacement is≥5 mm, immediately stop the grouting operation and resume grouting after the slurry initial setting;

[0163] 3. When the measured GIN value reaches 940 bar·L / m, the next grouting stage can be entered.

[0164] Primary stage:

[0165] Slurry: particle size unchanged, water-cement ratio adjusted to 2:1, increased viscosity to block hidden pores.

[0166] Parameters: pressure increased to 0.4-0.6 MPa, flow rate 20-25 L / min.

[0167] Switch:

[0168] 1. When K≥±0.1 MPa / 5 min (K is negative, take the absolute value), switch to the previous grouting stage, and maintain the operation with 50% of the grouting pressure and grouting amount of the stage, until the cumulative GIN value reaches 25% of the target value of the current stage GIN value, then enter the next stage.

[0169] 2. When the lifting displacement is≥5 mm, immediately stop the grouting operation and resume grouting after the slurry initial setting;

[0170] 3. When there is slurry leakage or slurry pouring around, inject quick-setting agent, and the pressure is adjusted back to 0.3 MPa.

[0171] 4. When the measured GIN value reaches 1060 bar·L / m, the secondary grouting stage can be entered.

[0172] Secondary stage:

[0173] Slurry: particle size unchanged, water-cement ratio 1:1 thick slurry, considering both permeability and consolidation strength.

[0174] Parameters: pressure 0.6-0.8 MPa, flow rate 25 L / min.

[0175] Risk control: Allowable leakage ≤ 0.5 L / min.

[0176] Switch:

[0177] 1. When K ≥ ± 0.1 MPa / 5 min (K is negative, take the absolute value), switch to the previous grouting stage, and maintain the operation at 50% of the grouting pressure and grouting volume of the stage until the cumulative GIN value reaches 25% of the target value of the current stage, and then enter the next stage.

[0178] 2. When the lifting displacement is ≥ 5 mm, immediately stop the grouting operation and resume grouting after the slurry initial setting.

[0179] 3. When the pressure fluctuation is > ± 0.1 MPa / 5 min (negative, take the absolute value) or the surface lifting is > 1.5 mm, pause grouting and return to the first stage. When the measured GIN value reaches 1370 bar·L / m, enter the final hole grouting stage

[0180] Final hole stage:

[0181] Slurry: unchanged particle size, water-cement ratio 0.5:1 high concentration slurry, filling residual pores.

[0182] Parameters: constant pressure 0.8 MPa, flow rate 5 L / min.

[0183] Switch:

[0184] 1. When K ≥ ± 0.1 MPa / 5 min (K is negative, take the absolute value), switch to the previous grouting stage, and maintain the operation at 50% of the grouting pressure and grouting volume of the stage until the cumulative GIN value reaches 25% of the target value of the current stage, and then enter the next stage.

[0185] 2. When the lifting displacement is ≥ 5 mm, immediately stop the grouting operation and resume grouting after the slurry initial setting.

[0186] 3. When the measured GIN value reaches 780 bar·L / m, end the grouting operation.

[0187] In the process of "medium weathered layer reinforcement", 0.2-0.8 MPa medium-high pressure grouting technology is used to inject early strength cement-bentonite composite slurry containing 5-8 mm special coarse aggregate and sodium silicate activator. Through gradual staged control strategy, it is gradually promoted according to the order of "initial → first → second → final hole", and the specific process is as follows:

[0188] Initial stage:

[0189] Slurry: aggregate particle size 5-8 mm, water glass early strength cement bentonite, water glass content 3%-5%, bentonite content 30%, water-cement ratio 3:1 thin slurry, ensure liquidity, fill loose pores.

[0190] Parameters: pressure 0.4-0.5 MPa, flow rate 40 L / min.

[0191] Switch: 1. When K≥±0.1 MPa / 5 min (K is negative, take the absolute value), keep the initial stage unchanged, and maintain the operation with 50% of the grouting pressure and grouting amount of the stage until the cumulative GIN value reaches 25% of the target value of the current stage GIN value, and then enters the next stage.

[0192] 2. When the lifting displacement is≥5 mm, immediately stop the grouting operation and resume grouting after the slurry is initially set.

[0193] 3. When the measured GIN value reaches 1070 bar·L / m, the next grouting stage can be entered.

[0194] Primary stage:

[0195] Slurry: particle size unchanged, water-cement ratio adjusted to 2:1, increased viscosity to block hidden pores.

[0196] Parameters: pressure rises to 0.5-0.7 MPa, flow rate 20-25 L / min.

[0197] 1. When K≥±0.1 MPa / 5 min (K is negative, take the absolute value), switch to the previous grouting stage, and maintain the operation with 50% of the grouting pressure and grouting amount of the stage until the cumulative GIN value reaches 25% of the target value of the current stage GIN value, and then enters the next stage.

[0198] 2. When the lifting displacement is≥5 mm, immediately stop the grouting operation and resume grouting after the slurry is initially set.

[0199] 3. When there is leakage and slurry, inject a quick-setting agent, and the pressure is adjusted back to 0.3 MPa.

[0200] 4. When the measured GIN value reaches 1210 bar·L / m, the secondary grouting stage can be entered.

[0201] Secondary stage:

[0202] Slurry: water-cement ratio 1:1 thick slurry, considering both permeability and consolidation strength.

[0203] Parameters: pressure 0.7-0.9 MPa, flow rate 25 L / min.

[0204] Risk control: allow≤0.6 L / min controllable leakage.

[0205] Switching:

[0206] 1. When K≥±0.1 MPa / 5 minutes (K is negative, take the absolute value), switch to the previous grouting stage, and maintain the operation with 50% of the grouting pressure and grouting volume of the stage until the cumulative GIN value reaches 25% of the target value of the current stage, and then enter the next stage;

[0207] 2. When the lifting displacement is≥5 mm, immediately stop the grouting operation and resume grouting after the grouting material is initially set;

[0208] 3. When the pressure fluctuation is >±0.1 MPa / 5 minutes (K is negative, take the absolute value) or the surface lifting is >1.5 mm, pause the grouting and return to the previous stage. When the measured GIN value reaches 1570 bar·L / m, enter the final hole grouting stage.

[0209] Final hole stage:

[0210] Grouting material: high-concentration grouting material with a water-cement ratio of 0.5:1, filling residual pores.

[0211] Parameters: constant pressure 0.9 MPa, flow rate 5 L / min.

[0212] 1. When K≥±0.1 MPa / 5 minutes (K is negative, take the absolute value), switch to the previous grouting stage, and maintain the operation with 50% of the grouting pressure and grouting volume of the stage until the cumulative GIN value reaches 25% of the target value of the current stage, and then enter the next stage;

[0213] 2. When the lifting displacement is≥5 mm, immediately stop the grouting operation and resume grouting after the grouting material is initially set;

[0214] 3. When the measured GIN value reaches 900 bar·L / m, end the grouting operation.

[0215] In this embodiment, the data measurement module collects the grouting pressure, grouting volume, and ground lifting deformation data of the fully weathered granite sample in real time and sends them to the data analysis module. The data analysis module calculates the grouting pressure change rate, ground lifting displacement, and GIN value based on the collected data, generates different grouting instructions, and transmits them to the adaptive variable frequency grouting module. The adaptive variable frequency grouting module adjusts the motor frequency of the variable frequency grouting pump through the frequency converter according to the grouting instructions, controls the grouting flow rate and pressure, and uses different particle sizes of grouting materials and water-cement ratios to perform phased and progressive grouting on each grouting unit. This realizes the "sensing-analysis-execution" closed-loop logic, can monitor the grouting pressure, flow rate, and GIN value in real time, dynamically adjust the frequency converter parameters, effectively reduces the grouting cost and the grouting rate, and improves the grouting accuracy and reliability.

[0216] Step 140, when the grouting is finished, the hole of each grouting unit is sealed to obtain the fully weathered granite sample after layered grouting.

[0217] In some embodiments, when the grouting is finished, the hole of each grouting unit is sealed to obtain the fully weathered granite sample after layered grouting, comprising:

[0218] When the grouting is finished, the hole sealing instruction is sent to the variable frequency grouting pump through the data analysis module, the hole sealing instruction is to replace the slurry in the hole with cement-bentonite paste slurry with water-cement ratio of 0.5:1 and bentonite content of 30%, and the replacement process lasts for 30 minutes; based on the hole sealing instruction, the hole of each grouting unit is sealed to obtain the fully weathered granite sample after layered grouting.

[0219] For example, when the curtain hole grouting is finished and the single hole acceptance is qualified, the hole is sealed in time, and the "replacement and pressure grouting hole sealing method" is used for hole sealing, that is, the grouting pipe is lowered to the bottom of the hole, and the 0.5:1 thick cement slurry is injected into the bottom of the hole by the variable frequency grouting pump to replace the water or dilute slurry in the hole outside. After the 0.5:1 thick slurry is returned to the hole, the grouting pipe is pulled out, and the pure pressure grouting hole sealing is carried out by closing the hole, the sealing pressure is the maximum grouting pressure used for the grouting hole, when the injection rate is not more than 1L / min, the hole sealing continues for 30 minutes and ends.

[0220] During the grouting process, sometimes some special situations such as slurry overflow and slurry leakage may occur, and a plugging material such as water glass accelerator can be used to plug the slurry overflow point, and the frequency converter is adjusted to appropriately reduce the grouting pressure. The accelerator uses water glass, which is an alkaline accelerator with strong bonding force, high strength and good heat resistance. According to the on-site demand, it is mixed with water in a certain proportion and can play a role in 5-12 minutes after mixing. After hardening, it has good strength and toughness, and has no pollution to underground water.

[0221] In this embodiment, after the grouting is finished, the hole sealing instruction is sent to the variable frequency grouting pump through the data analysis module, and the slurry in the hole is replaced by cement-bentonite paste slurry with water-cement ratio of 0.5:1 and bentonite content of 30%, and the replacement process lasts for 30 minutes, which effectively improves the compactness of the fully weathered granite sample after grouting, improves the durability and stability of the grouting effect, enhances the compressive strength and engineering stability of the fully weathered granite, and reduces unnecessary resource waste.

[0222] According to the full weathered granite overburden layer grouting method based on adaptive frequency conversion provided by the embodiment of the application, by obtaining full weathered granite samples and performing joint analysis, different grouting units are divided in combination with permeability data and weathering degree, different particle size graded slurries are selected for grouting at different horizons, the adaptive frequency conversion grouting model is adopted, grouting parameters are flexibly regulated according to the characteristics of each weathering layer, and the grouting filling efficiency, filling effect and surface deformation control effect are effectively improved, and the grouting cost and grouting rate are reduced.

[0223] The main geological structure of the upper reservoir of a certain pumped storage power station is early Yanshan biotite granite, followed by late Yanshan acidic vein rock and Quaternary overburden. The groundwater type of the upper reservoir is mainly fissure and pore water in bedrock, the stratum presents medium to strong permeability, the grouting depth is 0-20m, and the weathering degree is divided into residual soil layer, full weathering layer, strong weathering layer and medium weathering layer. The data measurement module is responsible for real-time acquisition of grouting pressure and grouting amount data, the data analysis module analyzes the current grouting pressure and cumulative grouting amount, and compares them with the target value of the GIN value, and sends the grouting instruction to the adaptive frequency conversion grouting module according to the comparison result. The adaptive frequency conversion grouting module adjusts the frequency of the grouting pump motor through the frequency converter according to the different stages of each layer, controls the grouting flow and pressure, and realizes dynamic matching of parameters. Table 1 is the adaptive frequency conversion grouting technical parameter based on the GIN value provided by the embodiment of the application, and Table 2 is the constant pressure grouting process parameter for comparison provided by the embodiment of the application.

[0224] Table 1 Adaptive frequency conversion grouting technical parameter based on GIN value

[0225]

[0226] Table 2 Constant pressure grouting process parameter for comparison

[0227]

[0228] The construction process of the above constant pressure grouting process for comparison is as follows:

[0229] The initial water-cement ratio is 5:1, the grouting pressure is 0.2MPa, and the grouting flow is 40L / min, and the grouting is carried out in the grouting hole, until the grouting hole cannot be injected into the second stage of the water-cement ratio 3:1, the grouting pressure 0.4MPa and the grouting flow 20-25L / min, and then the grouting is continued, until the final water-cement ratio is 0.5:1, the grouting pressure is 0.8MPa, and the grouting flow is 5L / min, and then the hole is sealed after the grouting hole cannot be injected.

[0230] Through the comparison of the effects before and after grouting by permeability data and the like, it can be seen from Tables 1 and 2 that, by using the self-adaptive variable frequency layered grouting method based on the GIN value for grouting, the permeability coefficients of 95% of the impervious bodies are reduced to ≤3×10-5 cm / s, meeting the requirements of the Design Specification for Pumped Storage Power Stations (NB / T 10072-2018), the average effective diffusion radius is 11.2 m, the stratum heave deformation is <1.0 mm, and the grouting rate is <5%, and no hole collapse occurs during the grouting process, and the construction efficiency is improved by more than 40%. By using the constant pressure grouting method for grouting, only 50% of the impervious bodies meet the specification requirements, the average effective diffusion radius is 8.61 m, the stratum heave deformation is >5.0 mm, and the grouting rate is >30%, and hole collapse occurs during the grouting process at the position of -15 to -20 m.

[0231] The self-adaptive variable frequency based full strong weathered granite overburden layered grouting method provided in the embodiments of the present application can be executed by a self-adaptive variable frequency based full strong weathered granite overburden layered grouting device. In the embodiments of the present application, the self-adaptive variable frequency based full strong weathered granite overburden layered grouting device is taken as an example to execute the self-adaptive variable frequency based full strong weathered granite overburden layered grouting method.

[0232] The embodiments of the present application also provide a self-adaptive variable frequency based full strong weathered granite overburden layered grouting device, as shown in the figure, which includes an acquisition module 410, a first processing module 420, a second processing module 430 and a hole sealing module 440. Figure 4

[0233] The acquisition module 410 is configured to acquire a full strong weathered granite sample, and perform joint analysis on the full strong weathered granite sample based on geological exploration and water pressure test to obtain permeability data and weathering degree of the full strong weathered granite sample.

[0234] The first processing module 420 is configured to divide the full strong weathered granite sample based on the weathering degree to obtain different grouting units, and the grouting units include residual soil layer, full weathering layer, strong weathering layer and medium weathering layer.

[0235] The second processing module 430 is configured to use grouting materials with different particle sizes and water-cement ratios to perform staged and progressive self-adaptive variable frequency grouting on each grouting unit based on a self-adaptive variable frequency grouting model.

[0236] The hole sealing module 440 is configured to seal the holes of each grouting unit when the grouting is completed to obtain the full strong weathered granite sample after layered grouting.

[0237] ​According to the full weathered granite overburden layer layered grouting method based on adaptive frequency conversion provided in the embodiment of the application, by obtaining full weathered granite samples and performing joint analysis, combining the permeability data and weathering degree, different grouting units are divided, different particle size graded slurries are selected for grouting according to different layers, the adaptive frequency conversion grouting model is adopted, the grouting parameters are flexibly adjusted according to the characteristics of each layer, the grouting filling efficiency, filling effect and surface deformation control effect are effectively improved, and the grouting cost and grouting rate are reduced.

[0238] The full weathered granite overburden layer layered grouting device based on adaptive frequency conversion provided in the embodiment of the application can realize the full weathered granite overburden layer layered grouting method based on adaptive frequency conversion Figures 1 to 3 The full weathered granite overburden layer layered grouting device based on adaptive frequency conversion provided in the embodiment of the application can realize the full weathered granite overburden layer layered grouting method based on adaptive frequency conversion

[0239] In some embodiments, as Figure 5 shown, the embodiment of the application further provides an electronic device 500, which includes a processor 501, a memory 502, and a computer program stored in the memory 502 and executable on the processor 501. When the processor 501 executes the program, each process of the above-mentioned full weathered granite overburden layer layered grouting method based on adaptive frequency conversion is realized, and the same technical effects can be achieved. To avoid repetition, details are not repeated here.

[0240] It should be noted that the electronic device in the embodiment of the application includes the mobile electronic device and the non-mobile electronic device described above.

[0241] The embodiment of the application further provides a non-transitory computer readable storage medium, which stores a computer program. When the processor executes the computer program, each process of the above-mentioned full weathered granite overburden layer layered grouting method based on adaptive frequency conversion is realized, and the same technical effects can be achieved. To avoid repetition, details are not repeated here.

[0242] The processor is the processor in the electronic device in the above-mentioned embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a magnetic disk or an optical disk, etc.

[0243] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a", "comprising", or "includes a", does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Additionally, it should be noted that the scope of the methods and apparatus of the present embodiments are not limited by the order of the steps or the sequence for performing the steps, as some steps can occur in different orders and / or concurrently with each other. Furthermore, the features of certain examples described can be combined with features of other examples.

[0244] From the above description of the embodiments, it is clear that the above-described method of the embodiments can be realized by means of software and the necessary universal hardware platform, of course, it can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a computer software product in essence or in the form of a computer software product that contributes to the prior art, which is stored in a storage medium (such as ROM / RAM, magnetic disc, optical disc), and includes a plurality of instructions for making a terminal (which can be a mobile phone, computer, server, or network equipment, etc.) execute the self-adaptive frequency conversion based full-strength weathered granite overburden layer layering grouting method of the various embodiments of the present application.

[0245] In the description of the present application, "first feature" and "second feature" can include one or more of the features.

[0246] In the description of the present application, "a plurality of" means two or more.

[0247] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are only illustrative and not restrictive, and those of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims, which all belong to the protection of the present application.

[0248] In the description of the application, reference has been made to descriptive terms such as "one embodiment", "some embodiments", "an embodiment", "example", "specific example" or "some examples" etc. It is emphasized that each of these terms refers to a specific feature, structure, material or characteristic described in connection with a particular embodiment or example. The descriptive terms are not necessarily referring to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0249] While embodiments of the application have been shown and described, it is to be understood that the application is not limited to the details of the embodiments described, since the scope of the application is defined with respect to the appended claims.

Claims

1. A method for full weathered granite overburden layering grouting based on adaptive frequency conversion, characterized in that the method The method comprises the steps of: obtaining a fully weathered granite sample, and performing joint analysis on the fully weathered granite sample based on geological exploration and water pressure test to obtain a weathering degree of the fully weathered granite sample; dividing the fully weathered granite sample based on the weathering degree to obtain different grouting units, wherein the grouting units include residual soil layer, fully weathered layer, strongly weathered layer and moderately weathered layer; performing phased and progressive adaptive variable-frequency grouting on each grouting unit by using grouting materials with different particle sizes and water-cement ratios based on the adaptive variable-frequency grouting model; wherein the adaptive variable-frequency grouting model comprises a data measurement module, a data analysis module and an adaptive variable-frequency grouting module; the data measurement module is used to collect grouting pressure, grouting quantity and stratum heave deformation data of the fully weathered granite sample and send them to the data analysis module; the data analysis module is used to calculate grouting pressure change rate, stratum heave displacement amount and GIN value according to the grouting pressure, grouting quantity and stratum heave deformation data of the fully weathered granite sample, obtain different grouting instructions based on preset threshold values of the grouting pressure change rate, stratum heave displacement amount and GIN value, and send the grouting instructions to the adaptive variable-frequency grouting module; the adaptive variable-frequency grouting module is used to perform phased and progressive adaptive variable-frequency grouting on each grouting unit according to the grouting instructions, use grouting materials with different particle sizes for different grouting units, use grouting materials with water-cement ratios from large to small for the same grouting unit according to the grouting sequence of initial stage, one or more intermediate stages and final hole stage, adjust motor frequency of the variable-frequency grouting pump through the frequency converter based on preset threshold values of the grouting pressure change rate, stratum heave displacement amount and GIN value, control grouting flow and pressure, and perform phased and progressive adaptive variable-frequency grouting on each grouting unit; when grouting is completed, hole sealing is performed on each grouting unit to obtain the fully weathered granite sample after layered grouting; performing phased and progressive adaptive variable-frequency grouting on each grouting unit by using grouting materials with different particle sizes and water-cement ratios based on the adaptive variable-frequency grouting model, comprising: judging whether the grouting pressure change rate is greater than or equal to a first preset threshold value through the data analysis module, obtaining a first grouting instruction when the grouting pressure change rate is greater than or equal to the preset threshold value, wherein the first grouting instruction is to switch to the parameter of the previous grouting stage, and the initial stage remains unchanged when the initial stage is in the initial stage, and the grouting is maintained at 50% of the grouting pressure and the grouting quantity of the stage until the cumulative GIN value reaches 25% of the GIN value target value of the current stage to restore the original stage parameter; obtaining a second grouting instruction when the grouting pressure change rate is less than the first preset threshold value, wherein the second grouting instruction is to maintain the current grouting parameter for continuous operation; sending the first grouting instruction and the second grouting instruction to the adaptive variable-frequency grouting module, and performing phased and progressive adaptive variable-frequency grouting on each grouting unit according to the first grouting instruction and the second grouting instruction.

2. The method for full weathered granite overburden layering grouting based on adaptive frequency conversion according to claim 1, characterized in that, performing phased and progressive adaptive variable-frequency grouting on each grouting unit by using grouting materials with different particle sizes and water-cement ratios based on the adaptive variable-frequency grouting model, further comprising: determining, by the data analysis module, whether the stratum uplift displacement is greater than or equal to a second preset threshold value, when the stratum uplift displacement is greater than or equal to the second preset threshold value, obtaining a third grouting instruction, the third grouting instruction being to immediately stop the grouting operation and to resume the grouting after the grout is initially set; when the stratum uplift displacement is less than the second preset threshold value, obtaining a second grouting instruction, the second grouting instruction being to maintain the current grouting parameters for continuous operation; sending the second grouting instruction and the third grouting instruction to the adaptive variable frequency grouting module, and the adaptive variable frequency grouting module performing phased and progressive adaptive variable frequency grouting on each grouting unit according to the second grouting instruction and the third grouting instruction.

3. The method for full weathered granite overburden layering grouting based on adaptive frequency conversion according to claim 1, characterized in that, Based on the adaptive variable frequency grouting model, different particle sizes and water-cement ratios of grouting materials are used to perform phased and progressive adaptive variable frequency grouting on each grouting unit, which further includes: determining, by the data analysis module, whether the GIN value reaches a third preset threshold value, when the GIN value reaches the third preset threshold value, determining whether the grouting unit is in the final hole stage at this time, if the grouting unit is in the final hole stage, obtaining a fourth grouting instruction, the fourth grouting instruction being to terminate the grouting operation, if the grouting unit is not in the final hole stage, obtaining a fifth grouting instruction, the fifth grouting instruction being to enter the next grouting stage; sending the fourth grouting instruction and the fifth grouting instruction to the adaptive variable frequency grouting module, and the adaptive variable frequency grouting module performing phased and progressive adaptive variable frequency grouting on each grouting unit according to the fourth grouting instruction and the fifth grouting instruction.

4. The method for full weathered granite overburden layering grouting based on adaptive frequency conversion according to claim 3, characterized in that, Different third preset threshold values are used in different grouting stages, wherein the third preset threshold values of each grouting stage in the fully weathered layer are determined through field grouting tests, and the third preset threshold values of each grouting stage in the residual soil layer, the strongly weathered layer and the moderately weathered layer are corrected based on the preset threshold value of the GIN value in the fully weathered layer and the SPT-N value obtained from the standard penetration test.

5. The method for full weathered granite overburden layering grouting based on adaptive frequency conversion according to claim 1, characterized in that, When the grouting is completed, each grouting unit is sealed to obtain a fully weathered and strongly weathered granite sample after layered grouting, which includes: When the grouting is completed, a sealing instruction is sent to the variable frequency grouting pump by the data analysis module, the sealing instruction being to inject cement-bentonite paste grout with a water-cement ratio of 0.5:1 and a bentonite content of 30% for in-hole grout replacement, and the replacement process lasts for 30 minutes; Based on the sealing instruction, each grouting unit is sealed to obtain a fully weathered and strongly weathered granite sample after layered grouting.

6. The method for full weathered granite overburden layering grouting based on adaptive frequency conversion according to claim 1, characterized in that, Based on the degree of weathering, the fully weathered and strongly weathered granite sample is divided into different grouting units, which includes: Performing a standard penetration test on the fully weathered and strongly weathered granite sample to obtain a standard penetration test blow count; Based on the standard penetration test blow count, the weathering degree of different parts of the fully weathered and strongly weathered granite sample is obtained, the weathering degree of the part with a standard penetration test blow count less than 30 is low, the weathering degree of the part with a standard penetration test blow count greater than or equal to 30 and less than 50 is full, the weathering degree of the part with a standard penetration test blow count greater than or equal to 50 and less than 200 is strong, and the weathering degree of the part with a standard penetration test blow count greater than or equal to 200 is moderate; Based on the weathering degree, the full weathered granite sample is divided, the part with low weathering degree is set as the residual soil layer grouting unit, the part with full weathering degree is set as the full weathering layer grouting unit, the part with strong weathering degree is set as the strong weathering layer grouting unit, and the part with medium weathering degree is set as the medium weathering layer grouting unit.

7. A device for the adaptive frequency variation based full weathered granite overburden layer grouting, for the implementation of the adaptive frequency variation based full weathered granite overburden layer grouting method according to any one of claims 1 to 6, characterized in that, The device comprises: An acquisition module is configured to acquire a full weathered granite sample, and perform joint analysis on the full weathered granite sample based on geological exploration and water pressure test to obtain a weathering degree of the full weathered granite sample; A first processing module is configured to divide the full weathered granite sample based on the weathering degree to obtain different grouting units, wherein the grouting units include a residual soil layer, a full weathering layer, a strong weathering layer and a medium weathering layer; A second processing module is configured to perform staged and progressive adaptive frequency conversion grouting on each grouting unit by using grouting materials with different particle sizes and water-cement ratios based on an adaptive frequency conversion grouting model; A hole sealing module is configured to seal each grouting unit when the grouting is completed to obtain a full weathered granite sample after layered grouting.

8. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor executes the program to implement the layered grouting method for full weathered granite cover layer based on adaptive frequency conversion according to any one of claims 1 to 6. 9.A non-transitory computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the layered grouting method for full weathered granite cover layer based on adaptive frequency conversion according to any one of claims 1 to 6.

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