A rock testing method and system based on multi-field coupling effect

Abstract

This application provides a rock testing system based on multi-field coupling effects, aiming to efficiently acquire abundant rock property data. The system includes a rock sample pretreatment module, a laser scanning module, multiple rock sample pressurization modules, a series seepage module, a temperature control module, and a central control module. The rock sample pretreatment module splits and segments the rock cores, forming multiple rock core samples of equal length with fractures. The laser scanning module performs three-dimensional scanning of the fracture surface. The rock sample pressurization module applies pressure, the series seepage module realizes the series seepage of multiple samples, and the temperature control module regulates the temperature of the seepage liquid. The central control module is responsible for controlling the other modules and collecting data. This system can simultaneously test multiple rock core samples under different conditions, greatly improving testing efficiency and data acquisition speed. This not only provides abundant experimental data for rock property research but also provides rapid and sufficient data support for related geological engineering projects.

Description

Technical Field

[0001] This application relates to the field of rock mechanics, and in particular to a rock testing method and system based on multi-field coupling effects. Background Technology

[0002] Rocks in underground environments are typically subjected to multiple physical and chemical fields simultaneously, including stress, temperature, seepage, and pH. These physical and chemical fields are coupled with each other, jointly influencing the mechanical properties and deformation and failure characteristics of rocks. Rock testing methods based on multi-field coupling effects aim to simulate the complex state of rocks in actual underground environments, study the mechanical properties and failure mechanisms of rocks under multi-field coupling, and provide more reliable parameters for underground engineering design and safety assessment.

[0003] Existing multi-field coupled rock testing methods mainly include stress-seepage coupling tests, stress-temperature coupling tests, stress-chemical coupling tests, and triaxial stress-temperature-seepage coupling tests. The main advantage of these methods is that they can simulate the combined effects of multiple physical fields, the test results are closer to the mechanical behavior of rocks in actual engineering, and they can reveal complex mechanical phenomena that are difficult to detect in single-physical-field tests.

[0004] However, existing methods also have some limitations. They are usually tested on the same rock sample under different test conditions, and rock tests themselves are time-consuming. This makes the entire test process take much longer and inefficient. Summary of the Invention

[0005] This application provides a rock testing system based on multi-field coupling effects, including:

[0006] The rock sample pretreatment module is used to split the collected rock cores to form core fractures for seepage and to divide the rock cores into multiple core samples of equal length.

[0007] A laser scanning module is used to perform three-dimensional scanning of the surface of rock core fractures to obtain three-dimensional images;

[0008] Multiple rock sample pressurization modules are used to apply pressure to rock core samples;

[0009] A series seepage module is used to perform seepage on multiple core samples in series.

[0010] Temperature control module, used to regulate the temperature of the seepage liquid during seepage;

[0011] The central control module is used to control other modules and acquire corresponding data;

[0012] The rock sample pretreatment module, the laser scanning module, the rock sample pressurization module, the series seepage module, and the temperature control module are all communicatively connected to the central control module. The temperature control module is connected to the series seepage module with adjustable temperature. The series seepage module connects each rock core sample in a unidirectional manner.

[0013] The rock sample pretreatment module includes a splitting module and a segmentation module, which are communicatively connected to the central control module.

[0014] By adopting the above technical solution, the rock test system based on multi-field coupling effect can divide the collected rock core into multiple rock core samples for simultaneous testing under different conditions, so as to obtain rich test data under different conditions for studying rock properties. It can also reduce the time required for testing and quickly provide sufficient data support for related geological engineering.

[0015] Optionally, the series seepage module includes a main seepage inlet, multiple series seepage outlets, multiple unidirectional flow pipes, multiple detection modules, multiple bypass seepage pipes, multiple series seepage inlets, multiple water pressure modules, and multiple liquid storage modules. Each unidirectional flow pipe is unidirectionally connected between the corresponding series seepage outlet and the corresponding series seepage inlet. Each detection module is measurably connected to the main seepage inlet, each series seepage outlet, and each series seepage inlet. Each bypass seepage pipe is correspondingly connected to each series seepage inlet. The main seepage inlet, each bypass seepage pipe, and each liquid storage module are conductively connected to the corresponding water pressure module.

[0016] By adopting the above technical solution, the rock test system based on multi-field coupling effect can conduct series seepage tests on rock core samples obtained by segmenting the same rock core. The system's flexibility is increased by setting up bypass seepage pipes and water pressure modules, which can adjust the pressure conditions of different rock sample sections, simulate various complex underground seepage pressure environments, realize synchronous simulation and testing of different seepage conditions, and obtain corresponding rock core change data, thereby reducing the total time consumption of rock tests and accelerating the speed of rock tests.

[0017] Optionally, the rock testing system based on multi-field coupling effects further includes a rock testing strategy, which includes the following steps:

[0018] A1, the laser scanning module is used to scan the surface of the core fractures of each core sample to obtain the initial three-dimensional data of the fracture surface of each core sample.

[0019] A2, each core sample is fixed to the corresponding core sample pressure module;

[0020] A3, set the corresponding test conditions for each core sample;

[0021] A4. Based on the confining pressure and axial pressure values ​​in the sample test conditions of each core sample, the confining pressure and axial pressure are applied to the core sample through the sample pressurization module.

[0022] A5, according to the preset basic seepage pressure value, the preset basic seepage fluid is applied to each core sample in series through the water pressure module corresponding to the total seepage inlet;

[0023] A6, at the series seepage outlets corresponding to each core sample, the corresponding outflow detection data and outflow sampling are obtained through the corresponding detection module;

[0024] A7. Determine the corresponding seepage pressure adjustment value based on the seepage pressure value in the outflow detection data of each core sample and the seepage pressure value in the corresponding sample test conditions of the subsequent core samples.

[0025] A8, adjust the water pressure module corresponding to each subsequent core sample according to the seepage pressure adjustment value;

[0026] A9, the water pressure module applies the corresponding bypass seepage liquid to the corresponding bypass seepage pipe.

[0027] By adopting the above technical solution, the rock test system based on multi-field coupling effect can control the test conditions of each rock core sample, including confining pressure, axial pressure, seepage pressure, seepage fluid pH value, and seepage fluid temperature, so that the test can more closely resemble complex geological environments. The real-time monitoring and data acquisition mechanism allows staff to dynamically adjust experimental parameters. In particular, through the bypass seepage design, independent seepage pressure adjustment can be carried out for different rock sample sections, further improving the flexibility of the test. It can not only obtain rich experimental data, but also simulate and study various complex underground fluid conditions, providing strong data acquisition support for a deeper understanding of rock seepage characteristics and multi-field coupling effects.

[0028] Optionally, the rock testing strategy further includes the following steps for preprocessing to generate core samples:

[0029] B1, The pre-selected rock core is split by the splitting module of the rock sample pretreatment module to form corresponding rock core fractures;

[0030] B2, The rock core is segmented by the segmentation module of the rock sample preprocessing module and multiple rock core samples of equal length are formed in sequence;

[0031] B3, fix each core sample in sequence to the corresponding core sample pressure module.

[0032] By adopting the above technical solution, the rock test system based on multi-field coupling effect can obtain multiple rock core samples of equal length by splitting and dividing the rock core. This can ensure the consistency of each rock core sample in terms of cost and characteristics. Rock core samples of equal length can avoid excessive errors in rock tests caused by different lengths. By fixing each rock core sample in sequence, the continuity of rock core fractures can be simulated during seepage to ensure the validity of test data.

[0033] Optionally, the rock testing strategy further includes the following steps:

[0034] C1, the temperature of the basic seepage fluid in each of the liquid storage modules and the bypass seepage fluid corresponding to each core sample are maintained by the temperature control module according to the preset basic temperature.

[0035] C2, determine the corresponding seepage temperature value from the outflow detection data of each core sample, and determine the corresponding seepage temperature value from the sample test conditions of subsequent core samples.

[0036] C3, based on the leaching temperature value and the seepage temperature value, adjusts the temperature of the bypass seepage fluid in the bypass seepage pipe corresponding to the subsequent core sample through the temperature control module.

[0037] By adopting the above technical solution, the rock test system based on multi-field coupling effect can improve the comprehensiveness of rock tests through adjustable temperature control, simulate different geological temperature environments, and make rock tests closer to actual underground conditions. Furthermore, by monitoring the temperature of the seepage fluid in real time and dynamically adjusting the seepage fluid temperature of subsequent rock samples, the system can study the influence of temperature gradient on rock permeability, providing sufficient experimental data for geological engineering. Moreover, temperature control can enhance the functionality and applicability of the test system, providing experimental support for in-depth research on rock-fluid interactions under complex geological conditions.

[0038] Optionally, the rock testing strategy further includes the following steps:

[0039] D1, prepare the corresponding base permeate solution according to the preset base pH value;

[0040] D2, determine the corresponding seepage pH value from the outflow detection data of each core sample, and determine the corresponding seepage pH value from the sample test conditions of subsequent core samples.

[0041] D3, adjust the pH value of the bypass seepage fluid in the storage module corresponding to the core sample according to the seepage pH value and the seepage pH value.

[0042] By adopting the above technical solution, the rock test system based on multi-field coupling effect can control and dynamically adjust the pH value of the seepage fluid to simulate chemical conditions under various geological environments, making the rock test closer to the actual underground conditions. It can study the influence of pH changes on rock permeability and chemical reactions, and provide a data acquisition path for observing the influence of pH changes on the physical and chemical properties of rocks.

[0043] Optionally, the rock testing strategy further includes the following steps for setting the sample testing conditions for each core sample:

[0044] E1, when the segmentation module segments the rock core, the corresponding sample number is set sequentially for each generated rock core sample;

[0045] E2, assign all preset confining pressure test parameters to the corresponding sample numbers;

[0046] E3, assign all preset axial compression test parameters to the corresponding sample numbers;

[0047] E4 assigns all preset osmotic pressure test parameters to the corresponding sample numbers in ascending order;

[0048] E5 assigns all preset temperature test parameters to the corresponding sample numbers in ascending order;

[0049] E6 assigns all preset pH test parameters to the corresponding sample numbers in descending order;

[0050] E7 generates the corresponding core sample test conditions based on the combination of confining pressure test parameters, axial pressure test parameters, temperature test parameters, and pH test parameters assigned to each sample number.

[0051] By adopting the above technical solution, the rock test system based on multi-field coupling effect can comprehensively cover various combinations of geological conditions and environmental factors by orderly allocating different types of test parameters, especially the gradient allocation of parameters such as seepage pressure, temperature, and pH value. This allows researchers to systematically observe the influence of these factors on rock properties, not only simulating complex underground environments but also revealing the changing laws of rock mechanics and seepage characteristics under multi-field coupling effect. This provides a structured experimental basis for subsequent data analysis and model building, and is conducive to discovering the interaction and potential correlation between different parameters, providing strong experimental support for in-depth research on rock properties under complex geological conditions.

[0052] This application also provides a rock testing method based on multi-field coupling effect, including the following steps:

[0053] The pre-selected rock cores are split to form corresponding rock core fractures;

[0054] The rock core was segmented and multiple rock core samples of equal length were formed in sequence;

[0055] The surface of the fractures in each core sample was scanned to obtain the initial three-dimensional data of the fracture surface corresponding to each core sample;

[0056] Each core sample was fixed in sequence.

[0057] Set corresponding test conditions for each core sample;

[0058] Confining pressure and axial pressure are applied to the core samples based on the confining pressure and axial pressure values ​​in the sample test conditions.

[0059] Based on the preset baseline seepage pressure value, the preset baseline seepage fluid is applied to each core sample in a series manner;

[0060] Obtain effluent detection data and effluent sampling for each core sample;

[0061] The corresponding seepage pressure adjustment value is determined based on the seepage pressure value in the outflow detection data of each core sample and the seepage pressure value in the corresponding sample test conditions of the subsequent core samples.

[0062] The corresponding bypass fluid is applied to subsequent core samples according to the pressure regulation value.

[0063] By adopting the above technical solution, the rock test method based on multi-field coupling effect can control the test conditions of each rock core sample, making the test closer to complex geological environments. The real-time monitoring and data acquisition mechanism allows staff to dynamically adjust the experimental parameters. In particular, through the design of bypass seepage, independent seepage pressure adjustment can be carried out for different rock sample sections, further improving the flexibility of the test. It can not only obtain rich experimental data, but also simulate and study various complex underground fluid conditions, providing strong data acquisition support for a deeper understanding of rock seepage characteristics and multi-field coupling effect.

[0064] In summary, this application includes at least one of the following beneficial technical effects:

[0065] 1. The collected rock cores can be divided into multiple core samples for simultaneous testing under different conditions to obtain rich test data under different conditions for studying rock properties. It can also reduce the time required for testing and quickly provide sufficient data support for related geological engineering.

[0066] 2. Series seepage tests can be conducted on core samples obtained by dividing the same core. The system's flexibility is increased by setting up bypass seepage pipes and water pressure modules. The pressure conditions of different rock sample sections can be adjusted to simulate various complex underground seepage pressure environments, so as to realize the synchronous simulation and testing of different seepage conditions and obtain the corresponding core change data. This reduces the total time consumption of rock tests and speeds up the rock test process.

[0067] 3. By controlling the experimental conditions of each core sample, including confining pressure, axial pressure, seepage pressure, seepage fluid pH, and seepage fluid temperature, the experiment can more closely simulate complex geological environments. Real-time monitoring and data acquisition mechanisms allow staff to dynamically adjust experimental parameters. In particular, the bypass seepage design allows for independent seepage pressure regulation for different rock sample sections, further improving the flexibility of the experiment. This not only enables the acquisition of abundant experimental data but also allows for the simulation and study of various complex underground fluid conditions, providing strong data support for a deeper understanding of rock seepage characteristics and multi-field coupling effects. Attached Figure Description

[0068] Figure 1 This is a schematic diagram of the principle of a rock testing system based on multi-field coupling effect according to the present invention.

[0069] Figure 2 This is a schematic diagram of the process of a rock testing method based on multi-field coupling effect according to the present invention. Detailed Implementation

[0070] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0071] The embodiments of this application will now be described in further detail with reference to the accompanying drawings.

[0072] refer to Figure 1 This invention provides a rock testing system based on multi-field coupling effect, used to simultaneously test multiple rock samples under different working conditions. The rock testing system based on multi-field coupling effect includes:

[0073] The rock sample pretreatment module 10 is used to split the collected rock cores to form core fractures for seepage and to divide the rock cores to form multiple core samples of equal length.

[0074] Laser scanning module 20 is used to perform three-dimensional scanning of the surface of rock core fractures to obtain three-dimensional images;

[0075] Multiple rock sample pressurization modules 30 are used to apply pressure to rock core samples;

[0076] The series seepage module 40 is used to perform seepage on multiple core samples in series.

[0077] Temperature control module 50 is used to regulate the temperature of the seepage liquid during seepage.

[0078] The central control module 60 is used to control other modules and acquire corresponding data;

[0079] The rock sample pretreatment module 10, the laser scanning module 20, the rock sample pressurization module 30, the series seepage module 40, and the temperature control module 50 are respectively connected to the central control module 60. The temperature control module 50 is connected to the series seepage module 40 with adjustable temperature. The series seepage module 40 connects each rock core sample in a unidirectional manner.

[0080] The rock sample pretreatment module includes a splitting module 11 and a segmentation module 12, which are respectively communicatively connected to the central control module 60.

[0081] The rock sample pretreatment module 10 is mainly used to preprocess the collected rock cores so that they can generate rock fissures for seepage pressure testing, and to divide them into multiple equal-length segments for simultaneous testing under different test conditions.

[0082] The laser scanning module 20 is mainly used to scan the three-dimensional surface structure of rock fissures. It can scan and obtain the three-dimensional structure data of the fissure surface of the rock core sample before and after the test and compare them to analyze the impact of the test on the fissure surface structure.

[0083] The rock sample pressurization module 30 is mainly used to apply different values ​​of confining pressure and axial pressure to each rock core sample after core segmentation, so as to achieve different test conditions simultaneously.

[0084] The series seepage module 40 is mainly used to connect the rock samples in series and apply seepage to each rock sample. That is, the seepage fluid applied by the series seepage module 40 seeps into the first rock sample, and then the seepage fluid seeping out of the first rock sample seeps into the second rock sample, and the seepage fluid seeping out of the second rock sample seeps into the third rock sample, and so on, until the seepage fluid finally seeps out of the last rock sample.

[0085] The temperature control module 50 is mainly used to regulate the temperature of the series permeation module 40 so as to maintain the temperature of the permeate flowing into each rock sample at the set test temperature conditions.

[0086] The central control module 60 is mainly used to control various related modules or modules so that they can work in a controlled manner.

[0087] Through the above technical solutions, the rock testing system based on multi-field coupling effect can divide the collected rock core into multiple rock core samples for simultaneous testing under different conditions, so as to obtain rich test data under different conditions for studying rock properties. It can also reduce the time required for testing and quickly provide sufficient data support for related geological engineering.

[0088] Furthermore, the series seepage module 40 includes a main seepage inlet 41, multiple series seepage outlets 42, multiple unidirectional flow pipes 43, multiple detection modules 44, multiple bypass seepage pipes 45, multiple series seepage inlets 46, multiple water pressure modules 47, and multiple liquid storage modules 48. Each unidirectional flow pipe 43 is unidirectionally connected between the corresponding series seepage outlet 42 and the series seepage inlet 46. Each detection module 44 is measurably connected to the main seepage inlet 41, each series seepage outlet 42, and each series seepage inlet 46. Each bypass seepage pipe 45 is correspondingly connected to each series seepage inlet 46. The main seepage inlet 41, each bypass seepage pipe 45, and each liquid storage module 48 are conductively connected to the corresponding water pressure module 47.

[0089] The main seepage inlet 41 is mainly used to apply the corresponding basic seepage to the first rock sample. The seepage applied through the main seepage inlet 41 will seep out from the corresponding series seepage outlet 42 through the core fracture of the first core sample and reach the series seepage inlet 46 corresponding to the second core sample through the unidirectional flow pipe 43 and enter the core fracture of the second core sample, and so on until it seeps out from the core fracture of the last core sample and from the series seepage outlet 42 corresponding to the last core sample.

[0090] Each of the series seepage outlets 42 is mainly used to provide an outlet for the seepage fluid of each core sample. The seepage fluid can be collected and detected by each of the detection modules 44 at the series seepage outlets 42. The seepage fluid of the corresponding core sample can be sampled and detected through the series seepage outlets 42, for example, to measure the ion concentration of the corresponding core sample.

[0091] Each of the unidirectional flow pipes 43 is mainly used to guide the seepage fluid between two adjacent core samples, so that the seepage fluid from the previous core sample can be used for the next core sample. The unidirectional flow characteristic can prevent the seepage fluid from flowing back. The corresponding unidirectional flow function can be achieved by setting a corresponding one-way valve in the pipe.

[0092] By connecting the series seepage outlet 42 corresponding to the previous core sample and the series seepage inlet 46 corresponding to the next core sample through the unidirectional flow guide pipe 43, the seepage fluid from the previous core sample can enter the next core sample.

[0093] Each of the aforementioned detection modules 44 is mainly used to detect parameters of the seepage fluid at various locations, such as the temperature, pressure, pH value, and ion concentration of the seepage fluid, so as to make corresponding adjustments.

[0094] Each of the bypass seepage pipes 45 is mainly used to apply another bypass seepage to the core sample from the bypass, and to adjust this bypass seepage according to the data obtained by the detection module 44, so that the basic seepage in the unidirectional flow pipe 43 and the bypass seepage in the bypass seepage pipe 45 can be combined and reach the seepage test conditions corresponding to the core sample.

[0095] Each of the series infiltration inlets 46 is mainly used to connect the unidirectional flow pipe 43 and the bypass flow pipe 45, and to combine the seepage fluid in the unidirectional flow pipe 43 and the bypass flow pipe 45 into the fracture of the corresponding rock core sample; and the detection module 44 detects the corresponding data at the series infiltration inlets 46, and can dynamically adjust the seepage fluid entering the rock core sample according to the detected data.

[0096] Each of the water pressure modules 47 is mainly used to adjust the pressure of the seepage fluid in the main seepage inlet 41 and each of the bypass seepage pipes 45.

[0097] Each of the aforementioned liquid storage modules 48 is mainly used to store the seepage fluid of the basic seepage and the bypass seepage corresponding to each core sample. By storing the seepage fluid of the basic seepage and the bypass seepage separately through each of the aforementioned liquid storage modules 48, the influence of seepage fluids that do not need to be adjusted on rock fractures can be tested simultaneously.

[0098] Through the above technical solutions, the rock testing system based on multi-field coupling effect can conduct series seepage tests on rock core samples obtained by segmenting the same rock core. The system's flexibility is increased by setting up bypass seepage pipes and water pressure modules, which can adjust the pressure conditions of different rock sample sections, simulate various complex underground seepage pressure environments, realize synchronous simulation and testing of different seepage conditions, and obtain corresponding rock core change data, thereby reducing the total time consumption of rock testing and accelerating the speed of rock testing.

[0099] Furthermore, the rock testing system based on multi-field coupling effect also includes a rock testing strategy, which includes the following steps:

[0100] A1, the laser scanning module 20 scans the surface of the core fractures of each core sample to obtain the initial three-dimensional data of the fracture surface of each core sample;

[0101] The initial three-dimensional data of the fracture surface is generated by laser three-dimensional scanning. It is obtained by scanning the surface of the core fracture of the rock core sample before the rock test. It can be used to compare with the surface after the rock test to analyze the influence of the test conditions on the fracture surface.

[0102] A2, each core sample is fixed to the corresponding core sample pressure module 30;

[0103] Each core sample is fixed to the corresponding rock sample pressure module 30 to selectively apply the same or different pressures for rock testing.

[0104] A3, set the corresponding test conditions for each core sample;

[0105] The sample test conditions are the various test parameters corresponding to the rock tests to be conducted on each core sample, such as the confining pressure, axial pressure, permeate pressure, permeate temperature, and permeate pH value. These parameters represent the stress field, seepage field, and chemical field, among other related environmental fields. Different test conditions are generated by combining these parameters to simulate various environments for testing the core samples. This allows us to obtain the changes in the core samples under different coupled environmental conditions, providing sufficient reference data on rock properties for related geological engineering projects.

[0106] A4. Based on the confining pressure and axial pressure values ​​in the sample test conditions of each core sample, the confining pressure and axial pressure are applied to the core sample through the rock sample pressurization module 30.

[0107] The confining pressure value is the pressure value of the confining pressure applied by the rock sample pressurization module 30 to the corresponding rock core sample;

[0108] The axial pressure value is the pressure value of the axial pressure applied by the rock sample pressurization module 30 to the corresponding rock core sample;

[0109] By setting different confining pressure and axial pressure values, the state of rock core samples under different underground pressures can be simulated. The confining pressure and axial pressure values ​​can be set manually to test the changes of rock core samples under different pressure conditions, or they can be set according to the actual conditions at the rock core sample collection point for simulation.

[0110] A5, according to the preset basic seepage pressure value, the preset basic seepage fluid is applied to each core sample in series through the water pressure module 47 corresponding to the total seepage inlet 41;

[0111] The base pressure value is a preset seepage pressure value used to apply the corresponding pressure to the first core sample. The base pressure value can be determined based on the minimum seepage pressure value in the test conditions of all core samples, or it can be set according to the test requirements.

[0112] The basic seepage fluid is a pre-prepared liquid used for seepage into the first core sample. The basic seepage fluid can be prepared according to requirements, such as distilled water, carbonic acid solution, dilute sulfuric acid solution, hydrochloric acid, etc., and can be prepared according to the experimental requirements and the composition of the core sample.

[0113] The temperature of the base seepage fluid can also be set according to the requirements of the test conditions. The temperature of the base seepage fluid can be adjusted through the temperature control module 50 to meet the corresponding test conditions.

[0114] A6, at the series seepage outlets 42 corresponding to each core sample, the corresponding detection module 44 obtains the corresponding outflow detection data and outflow sampling;

[0115] The outflow detection data is the detection data of the seepage fluid from each core sample, which may include data such as temperature, osmotic pressure, and pH. The corresponding data can be obtained by setting up corresponding sensors for data analysis and control adjustment.

[0116] Outflow sampling is the liquid sampling of the seepage fluid from each core sample, which can be used for further component analysis, such as the analysis of the concentration of various ions in the seepage fluid.

[0117] A7. Determine the corresponding seepage pressure adjustment value based on the seepage pressure value in the outflow detection data of each core sample and the seepage pressure value in the corresponding sample test conditions of the subsequent core samples.

[0118] The seepage pressure value is the pressure of the seepage fluid seeping from the core sample;

[0119] The seepage pressure adjustment value is a pressure value determined based on the seepage pressure and effusion pressure values ​​in the sample test conditions corresponding to the subsequent core samples.

[0120] The subsequent core sample is the next core sample in the series seepage, that is, the core sample that will seep into after the seepage fluid of the current core sample has seeped out.

[0121] Since the permeate in the core sample still has a certain pressure value, it can provide a certain pressure value for the seepage pressure conditions of the subsequent core sample. Based on the seepage pressure value required for the test conditions of the subsequent core sample, the required pressure value is calculated to reach the test conditions. Then, the corresponding seepage pressure value is applied by adjusting the bypass seepage pipe 45.

[0122] A8, adjust the water pressure module 47 corresponding to each subsequent core sample according to the seepage pressure adjustment value;

[0123] The pressure value of the corresponding water pressure module 47 is adjusted according to the seepage pressure adjustment value so that it can provide the corresponding pressure value so that the seepage acting on the subsequent core sample reaches the seepage pressure value of the test condition.

[0124] A9, the water pressure module 47 applies the corresponding bypass seepage liquid to the corresponding bypass seepage pipe 45;

[0125] The bypass seepage fluid is the seepage fluid applied from the bypass seepage pipe 45 to the corresponding core sample. By combining the seepage fluid from the previous core sample and the bypass seepage fluid, seepage can be formed on the current core sample.

[0126] On the one hand, the seepage fluid from the previous core sample can provide some seepage pressure, which can simulate the continuous process of seepage fluid infiltration in the core. On the other hand, the pressure of the seepage fluid in the bypass seepage pipe 45 can also be adjusted by the corresponding water pressure module 47 to apply seepage pressure under different working conditions to different core samples, thereby simulating different environmental conditions.

[0127] Through the above steps, the rock testing system based on multi-field coupling effects can control the test conditions of each rock core sample, including confining pressure, axial pressure, seepage pressure, seepage fluid pH value, and seepage fluid temperature, making the test more closely resemble complex geological environments. The real-time monitoring and data acquisition mechanism allows staff to dynamically adjust experimental parameters. In particular, the bypass seepage design allows for independent seepage pressure adjustment for different rock sample sections, further improving the flexibility of the test. It can not only obtain rich experimental data but also simulate and study various complex underground fluid conditions, providing strong data acquisition support for a deeper understanding of rock seepage characteristics and multi-field coupling effects.

[0128] Furthermore, the rock testing strategy also includes the following steps for preprocessing to generate core samples:

[0129] B1, the pre-selected rock core is split by the splitting module 11 of the rock sample pretreatment module 10 to form corresponding rock core fractures;

[0130] The splitting operation of the splitting module 11 divides the rock core into two halves, and by combining the two halves, a rock core fracture can be formed at the junction.

[0131] B2, the rock core is segmented by the segmentation module 12 of the rock sample preprocessing module 10 and multiple rock core samples of equal length are formed in sequence;

[0132] The core sample is a rock core that has been split and then divided into equal-length blocks by the segmentation module 12.

[0133] B3, sequentially fix each core sample to the corresponding core sample pressure module 30.

[0134] By fixing the core samples sequentially, the process of seepage fluid penetrating into the core fractures of an intact core can be well simulated when a seepage field is applied to each core sample.

[0135] Through the above steps, the rock test system based on multi-field coupling effect can obtain multiple rock core samples of equal length by splitting and dividing the rock core. This ensures the consistency of cost and characteristics among the rock core samples. The equal-length rock core samples can avoid excessive errors in rock tests caused by inconsistent lengths. By fixing each rock core sample in sequence, the continuity of rock core fractures can be simulated during seepage, thus ensuring the validity of the test data.

[0136] Furthermore, the rock testing strategy also includes the following steps:

[0137] C1, the temperature of the basic seepage fluid in each of the liquid storage modules 48 and the bypass seepage fluid corresponding to each core sample are maintained by the temperature control module 50 according to the preset basic temperature.

[0138] The base temperature is a pre-selected temperature value used to determine the temperature of the seepage fluid applied to the first core sample, i.e., the temperature value of the base seepage fluid, as well as the initial temperature value of the bypass seepage fluid for each core sample.

[0139] The base temperature can be determined based on the temperature value of the first core sample under test conditions. On the one hand, the seepage fluid can enable the first core sample to reach the temperature that meets the test conditions. On the other hand, it can also enable the bypass seepage fluid corresponding to other core samples to have a certain initial temperature, so that the subsequent samples can be quickly heated to the temperature value of the corresponding test conditions.

[0140] C2, determine the corresponding seepage temperature value from the outflow detection data of each core sample, and determine the corresponding seepage temperature value from the sample test conditions of subsequent core samples.

[0141] The infiltration temperature value is the temperature value of the osmotic fluid infiltrating from the core sample;

[0142] The seepage temperature value is the temperature of the seepage fluid that needs to be reached in the sample test conditions corresponding to the subsequent core samples.

[0143] C3, based on the leaching temperature value and the seepage temperature value, adjusts the temperature of the bypass seepage fluid in the bypass seepage pipe 45 corresponding to the subsequent core sample through the temperature control module 50.

[0144] The seepage fluid that typically seeps out of the core sample still carries a certain temperature. By determining the seepage temperature of the seepage fluid and the temperature that the subsequent core sample needs to reach, the temperature of the bypass seepage fluid can be dynamically adjusted so that the temperature of the seepage fluid entering the subsequent core sample meets the requirements of the test conditions.

[0145] Through the above steps, the rock testing system based on multi-field coupling effect can improve the comprehensiveness of rock testing through adjustable temperature control, simulate different geological temperature environments, and make rock testing closer to actual underground conditions. Furthermore, by monitoring the temperature of the seepage fluid in real time and dynamically adjusting the seepage fluid temperature of subsequent rock samples, the system can study the influence of temperature gradient on rock permeability, providing sufficient experimental data for geological engineering. Moreover, temperature control can enhance the functionality and applicability of the testing system, providing experimental support for in-depth research on rock-fluid interactions under complex geological conditions.

[0146] Furthermore, the rock testing strategy further includes the following steps:

[0147] D1, prepare the corresponding base permeate solution according to the preset base pH value;

[0148] The base pH value is a preset initial pH value used to determine the pH value of the base permeate. It can be set according to the test requirements or the composition of the base permeate. For example, when distilled water is used as the base permeate, its base pH value can naturally be set to 7. When dilute acid solution is used as the base permeate, the corresponding base pH value can be set according to the test conditions.

[0149] D2, determine the corresponding seepage pH value from the outflow detection data of each core sample, and determine the corresponding seepage pH value from the sample test conditions of subsequent core samples.

[0150] The leaching pH value is the pH value of the osmotic fluid leached from the core sample;

[0151] The seepage pH value is the pH value of the seepage fluid that needs to be achieved in the test conditions of the subsequent core samples.

[0152] D3, adjust the pH value of the bypass seepage fluid in the storage module 48 corresponding to the core sample according to the seepage pH value and the seepage pH value;

[0153] The pH values ​​of effluent and seepage can provide data for adjusting the pH value of the bypass seepage fluid. The pH value of the bypass seepage fluid can be changed by dynamically adjusting the pH value in the storage module 48, and further ensure that the pH value of the seepage fluid entering the subsequent core sample meets the requirements of the test conditions. For example, distilled water or a corresponding acid can be dynamically added to the storage module 48 of the bypass seepage fluid according to the effluent pH value and seepage pH value to achieve pH adjustment.

[0154] Through the above steps, the rock test system based on multi-field coupling effect can simulate chemical conditions under various geological environments by controlling and dynamically adjusting the pH value of the seepage fluid, making the rock test closer to the actual underground conditions. It can study the influence of pH changes on rock permeability and chemical reactions, and provide a data acquisition path for observing the influence of pH changes on the physical and chemical properties of rocks.

[0155] Furthermore, the rock testing strategy further includes the following steps for setting the sample testing conditions for each core sample:

[0156] E1, when the core is segmented by the segmentation module 12, the corresponding sample number is set sequentially for each generated core sample;

[0157] The sample number is the number corresponding to each core sample. For example, when a core is divided from top to bottom, each core sample is sorted and numbered from smallest to largest.

[0158] E2, assign all preset confining pressure test parameters to the corresponding sample numbers;

[0159] The confining pressure test parameters are the pre-set confining pressure values ​​that need to be tested. For example, the tests need to be conducted under confining pressures of 2 MPa, 3 MPa, and 4 MPa respectively. However, since each of the rock sample pressurization modules 30 applies pressure independently, different confining pressure values ​​can be assigned arbitrarily without considering the assignment order.

[0160] E3, assign all preset axial compression test parameters to the corresponding sample numbers;

[0161] The axial compression test parameters are the pre-set axial compression values ​​that need to be tested, the same as the confining pressure values ​​mentioned above, and there is no need to consider the allocation order.

[0162] E4 assigns all preset osmotic pressure test parameters to the corresponding sample numbers in ascending order;

[0163] The permeability test parameters are the pre-set permeability pressure values ​​that need to be tested. Since the permeability pressure values ​​will be transmitted to subsequent core samples through the permeate, it is necessary to assign the corresponding permeability test parameters to each core sample in ascending order of their values.

[0164] E5 assigns all preset temperature test parameters to the corresponding sample numbers in ascending order;

[0165] The temperature test parameters are the pre-set temperature values ​​of the seepage fluid to be tested. Since the temperature of the seepage fluid will also be transmitted to subsequent core samples through the seepage fluid, it is necessary to assign corresponding temperature test parameters to each core sample in ascending order of temperature.

[0166] E6 assigns all preset pH test parameters to the corresponding sample numbers in descending order;

[0167] The pH test parameters are the pre-set pH values ​​of the seepage fluid to be tested. Since the pH value of the seepage fluid will also be transmitted to subsequent core samples through the seepage fluid, it is necessary to assign corresponding pH test parameters to each core sample from high to low.

[0168] E7 generates the corresponding core sample test conditions based on the combination of confining pressure test parameters, axial pressure test parameters, temperature test parameters, and pH test parameters assigned to each sample number.

[0169] The corresponding sample test conditions are generated based on the combination of test parameters assigned to each sample number.

[0170] Through the above steps, the rock testing system based on multi-field coupling effects can comprehensively cover various combinations of geological conditions and environmental factors by orderly allocating different types of test parameters. In particular, the gradient allocation of parameters such as osmotic pressure, temperature, and pH value allows researchers to systematically observe the influence of these factors on rock properties. It can not only simulate complex underground environments but also reveal the changing laws of rock mechanics and seepage characteristics under multi-field coupling effects. This provides a structured experimental basis for subsequent data analysis and model building, and is conducive to discovering the interaction and potential correlation between different parameters. It provides strong experimental support for in-depth research on rock properties under complex geological conditions.

[0171] refer to Figure 2 This application also provides a rock testing method based on multi-field coupling effect, including the following steps:

[0172] F1, splitting the pre-selected rock core to form the corresponding rock core fracture;

[0173] F2, the core is segmented and multiple core samples of equal length are formed in sequence;

[0174] F3, scan the surface of the core fractures of each core sample to obtain the initial three-dimensional data of the fracture surface of each core sample;

[0175] F4, fix each core sample in sequence;

[0176] F5 sets the corresponding test conditions for each core sample;

[0177] F6, apply confining pressure and axial pressure to the core samples based on the confining pressure and axial pressure values ​​in the sample test conditions of each core sample;

[0178] F7, based on the preset base seepage pressure value, applies seepage fluid to each core sample in a series manner;

[0179] F8, to obtain the outflow detection data and outflow sampling corresponding to each core sample;

[0180] F9. The corresponding seepage pressure adjustment value is determined based on the seepage pressure value in the outflow detection data of each core sample and the seepage pressure value in the corresponding sample test conditions of the subsequent core samples.

[0181] F10, based on the seepage pressure adjustment value, applies the corresponding bypass seepage fluid to subsequent core samples.

[0182] Through the above steps, the rock testing method based on multi-field coupling effect can control the test conditions of each rock core sample, making the test more closely resemble complex geological environments. The real-time monitoring and data acquisition mechanism allows staff to dynamically adjust experimental parameters. In particular, the bypass seepage design allows for independent seepage pressure adjustment for different rock sample sections, further improving the flexibility of the test. It can not only obtain rich experimental data, but also simulate and study various complex underground fluid conditions, providing strong data acquisition support for a deeper understanding of rock seepage characteristics and multi-field coupling effects.

[0183] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Any feature disclosed in this specification (including the abstract and drawings) may be replaced by other equivalent or similar features unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is only one example of a series of equivalent or similar features.

Claims

1. A rock testing system based on multi-field coupling effect, characterized in that, The rock sample pretreatment module is used for splitting the collected core to form a core fracture for seepage and segmenting the core to form a plurality of equal-length core samples; The laser scanning module is used for three-dimensional scanning of the surface of the core fracture to obtain a three-dimensional image; A plurality of rock sample pressurization modules are used for applying pressure to the core samples; The series seepage module is used for seepage of the plurality of core samples in a series manner; The temperature control module is used for regulating the temperature of the seepage liquid during seepage; The central control module is used for controlling other modules and obtaining corresponding data; The rock sample pretreatment module, the laser scanning module, the rock sample pressurization module, the series seepage module, and the temperature control module are respectively communicatively connected to the central control module, the temperature control module is adjustably connected to the series seepage module, and the series seepage module unidirectionally conducts each core sample in series; The rock sample pretreatment module includes a splitting module and a segmentation module, and the splitting module and the segmentation module are respectively communicatively connected to the central control module; The series seepage module includes a total seepage inlet, a plurality of series seepage outlets, a plurality of unidirectional flow conduits, a plurality of detection modules, a plurality of bypass seepage conduits, a plurality of series seepage inlets, a plurality of water pressure modules, and a plurality of liquid storage modules, each unidirectional flow conduit is unidirectionally connected between the corresponding series seepage outlet and the series seepage inlet, each detection module is respectively measurably connected to the total seepage inlet, each series seepage outlet, and each series seepage inlet, each bypass seepage conduit is respectively connected to each series seepage inlet, and the total seepage inlet, each bypass seepage conduit, and each liquid storage module are respectively conductively connected to the corresponding water pressure module; The rock test strategy includes the following steps: A1, scanning the surface of the core fracture of each core sample by the laser scanning module to obtain initial three-dimensional data of the fracture surface of each core sample; A2, respectively fixing each core sample in the corresponding rock sample pressurization module; A3, respectively setting the sample test conditions of each core sample; A4, applying confining pressure and axial pressure to the core sample by the rock sample pressurization module according to the confining pressure and axial pressure in the sample test conditions of each core sample; A5, applying seepage to each core sample in a series manner by the water pressure module corresponding to the total seepage inlet according to the preset basic seepage pressure value and the preset basic seepage liquid; A6, obtaining outflow detection data and outflow sampling of each core sample at the corresponding series seepage outlet by the corresponding detection module; A7, determining the seepage pressure adjustment value according to the seepage pressure value in the outflow detection data of each core sample and the seepage pressure value in the sample test conditions of the subsequent core sample; A8, adjusting the water pressure module corresponding to each subsequent core sample according to the seepage pressure adjustment value; A9, applying corresponding seepage to the corresponding bypass seepage conduit by the water pressure module with the corresponding bypass seepage liquid. ​ 2. The multi-field coupling effect based rock testing system of claim 1, wherein, The rock test strategy further comprises the following steps for preprocessing the generated core samples: B1, splitting the preselected core to form a corresponding core fracture through the splitting module of the rock sample preprocessing module; B2, segmenting the core to sequentially form a plurality of equal-length core samples through the segmentation module of the rock sample preprocessing module; B3, sequentially fixing each core sample in the corresponding rock sample pressurization module.

3. The multi-field coupling effect based rock testing system of claim 2, wherein, The rock test strategy further comprises the following steps: C1, maintaining the temperature of the base seepage fluid in each of the liquid storage modules and the corresponding bypass seepage fluid of each core sample through the temperature control module according to a preset base temperature; C2, determining the corresponding exudation temperature value in the outflow detection data of each core sample, and determining the corresponding seepage temperature value in the subsequent sample test conditions of the core sample; C3, adjusting the temperature of the bypass seepage fluid in the bypass seepage pipeline of the subsequent core sample through the temperature control module according to the exudation temperature value and the seepage temperature value.

4. The multi-field coupling effect based rock testing system of claim 3, wherein, The rock test strategy further comprises the following steps: D1, adjusting the corresponding base seepage fluid according to a preset base pH value; D2, determining the corresponding exudation pH value in the outflow detection data of each core sample, and determining the corresponding seepage pH value in the subsequent sample test conditions of the core sample; D3, adjusting the pH value of the bypass seepage fluid in the liquid storage module of the core sample according to the exudation pH value and the seepage pH value.

5. The multi-field coupling effect based rock testing system of claim 4, wherein, The rock test strategy further comprises the following steps for setting the sample test conditions of each core sample: E1, sequentially setting the corresponding sample number for each generated core sample when the core is segmented by the segmentation module; E2, assigning all preset confining pressure test parameters to the corresponding sample number; E3, assigning all preset axial pressure test parameters to the corresponding sample number; E4, sequentially assigning all preset seepage test parameters from small to large to the corresponding sample number; E5, sequentially assigning all preset temperature test parameters from small to large to the corresponding sample number; E6, sequentially assigning all preset pH test parameters from large to small to the corresponding sample number; E7, generating the sample test conditions of the corresponding core sample according to the combination of the confining pressure test parameters, the axial pressure test parameters, the temperature test parameters and the pH test parameters assigned to each sample number.

6. The multi-field coupling effect based rock testing system of claim 5, wherein, Further comprising the following steps: splitting the preselected core to form a corresponding core fracture; segmenting the core to sequentially form a plurality of equal-length core samples; scanning the surface of the core fracture of each core sample to obtain the corresponding initial three-dimensional data of the fracture surface of each core sample; sequentially fixing each core sample; setting the corresponding sample test conditions for each core sample; applying confining pressure and axial pressure to the core sample according to the confining pressure value and the axial pressure value in the sample test conditions of each core sample; applying seepage to each core sample in a series manner with a preset base seepage fluid according to a preset base seepage pressure value; obtaining the outflow detection data and outflow sampling corresponding to each core sample; The seepage pressure adjustment value corresponding to each core sample is determined according to the seepage pressure value in the outflow detection data of the core sample and the seepage pressure value in the sample test working condition corresponding to the core sample; The corresponding bypass seepage liquid is adjusted according to the seepage pressure adjustment value to apply the corresponding seepage to the subsequent core sample.

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