Rock test method and system based on multi-field coupling effect

Abstract

The invention provides a rock test system based on a multi-field coupling effect, and aims to efficiently obtain rich rock characteristic data. The system comprises a rock sample pretreatment module, a laser scanning module, a plurality of rock sample pressurization modules, a series seepage module, a temperature control module and a central control module. The rock sample pretreatment module is used for splitting and segmenting the rock core to form a plurality of equal-length rock core samples with fractures; and the laser scanning module performs three-dimensional scanning on the surface of the crack. The rock sample pressurizing module applies pressure, the series seepage module realizes series seepage of a plurality of samples, and the temperature control module adjusts the temperature of seepage liquid. The central control module is responsible for controlling other modules and collecting data. The system can simultaneously test a plurality of rock core samples under different conditions, so that the test efficiency and the data acquisition speed are greatly improved. Therefore, rich experimental data is provided for rock characteristic research, and sufficient data support can be quickly provided for related geological engineering projects.

Description

Technical Field

[0001] The present 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 Art

[0002] Rocks are usually affected by multiple physical and chemical fields in underground environments, including stress, temperature, seepage, and pH. These physical and chemical fields are mutually coupled, jointly affecting the mechanical properties and deformation and failure characteristics of rocks. The rock test method based on multi-field coupling effect aims 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] The existing multi-field coupled rock test methods mainly include stress-seepage coupling test, stress-temperature coupling test, stress-chemical coupling test and triaxial stress-temperature-seepage coupling test. The main advantages of these methods are 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 can reveal complex mechanical phenomena that are difficult to discover in single physical field tests.

[0004] However, the existing methods also have some limitations. The existing methods usually test the same rock sample under different test conditions, and the rock test itself has the defect of being time-consuming, which makes the entire test process time-consuming and inefficient. Summary of the invention

[0005] The present application provides a rock test system based on multi-field coupling effect, comprising:

[0006] A rock sample pre-processing module, used for splitting the collected rock core to form rock core fractures for seepage and for dividing the rock core to form a plurality of rock core samples of equal length;

[0007] A laser scanning module is used to perform three-dimensional scanning on the surface of the core fracture to obtain a three-dimensional image;

[0008] Multiple rock sample pressurization modules for applying pressure to core samples;

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

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

[0011] Central control module, used to control other modules and obtain corresponding data;

[0012] The rock sample pretreatment module, the laser scanning module, the rock sample pressurizing module, the series seepage module, and the temperature control module are respectively connected to the central control module by communication, the temperature control module is connected to the series seepage module in an adjustable manner, and the series seepage module connects the core samples in series in a unidirectional manner;

[0013] Wherein, the rock sample preprocessing 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.

[0014] By adopting the above technical solution, 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, and can also reduce the time required for the test, and can quickly provide sufficient data guarantee for related geological engineering.

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

[0016] By adopting the above technical scheme, the rock test system based on multi-field coupling effect can perform serial seepage tests on core samples obtained by segmenting the same core, and the flexibility of the system 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 synchronous simulation and testing of different seepage conditions, and obtain corresponding core change data, thereby reducing the total time consumption of rock tests and speeding up the speed of rock tests.

[0017] Optionally, the rock test system based on multi-field coupling effect further includes a rock test strategy, and the rock test strategy includes the following steps:

[0018] 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 corresponding to each core sample;

[0019] A2, respectively fixing each core sample to the corresponding rock sample pressurizing module;

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

[0021] A4, applying confining pressure and axial pressure to the core samples through the rock sample pressurization module according to the confining pressure value and axial pressure value in the sample test condition of each core sample;

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

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

[0024] A7, determining a corresponding 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 condition corresponding to the subsequent core sample;

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

[0026] A9, applying corresponding seepage with corresponding bypass seepage fluid to the corresponding bypass seepage pipeline through the hydraulic module.

[0027] By adopting the above technical scheme, the rock test system based on multi-field coupling effect can control the test conditions of each core sample, including confining pressure, axial pressure, seepage fluid pressure, seepage fluid pH value and seepage fluid temperature, so that the test can be closer to the complex geological environment. The real-time monitoring and data acquisition mechanism allows the staff to dynamically adjust the experimental parameters. In particular, through the design of bypass seepage, the seepage pressure can be independently adjusted for different rock sample sections, which further improves 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 in-depth understanding of rock seepage characteristics and multi-field coupling effects.

[0028] Optionally, the rock test strategy further includes the following steps for pre-processing the generated core samples:

[0029] B1, performing a splitting operation on a preselected rock core by the splitting module of the rock sample preprocessing module to form corresponding rock core fractures;

[0030] B2, performing a segmentation operation on the rock core by the segmentation module of the rock sample preprocessing module and sequentially forming a plurality of rock core samples of equal length;

[0031] B3, sequentially fixing each core sample to the corresponding rock sample pressurizing module.

[0032] By adopting the above technical scheme, the rock testing system based on multi-field coupling effect can obtain multiple core samples of equal length by splitting and dividing the core, which can ensure the consistency of cost and characteristics of each core sample. The core samples divided with equal length can avoid excessive errors in rock testing due to different lengths. By fixing each core sample in sequence, the continuity of the core cracks can be simulated during the seepage process to ensure the validity of the test data.

[0033] Optionally, the rock test strategy further comprises the following steps:

[0034] C1, maintaining the temperature of the basic seepage fluid in each of the liquid storage modules and the bypass seepage fluid corresponding to each core sample through the temperature control module according to a preset basic temperature;

[0035] C2, determining the corresponding seepage temperature value in the outflow detection data of each core sample, and determining the corresponding seepage temperature value in the sample test conditions corresponding to the subsequent core samples;

[0036] C3, adjusting the temperature of the bypass seepage fluid in the bypass seepage pipeline corresponding to the subsequent core sample through the temperature control module according to the seepage temperature value and the seepage temperature value.

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

[0038] Optionally, the rock test strategy further comprises the following steps:

[0039] D1, preparing the corresponding basic seepage fluid according to the preset basic pH value;

[0040] D2, determining the corresponding seepage pH value in the outflow detection data of each core sample, and determining the corresponding seepage pH value in the sample test conditions corresponding to the subsequent core samples;

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

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

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

[0044] E1, when the segmentation module segments the core, a corresponding sample number is sequentially set for each generated 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, assign all preset osmotic pressure test parameters to corresponding sample numbers in order from small to large;

[0048] E5, assign all preset temperature test parameters to the corresponding sample numbers in order from small to large;

[0049] E6, assign all preset pH test parameters to the corresponding sample numbers in order from large to small;

[0050] E7, generating the sample test conditions of the corresponding core samples according to the combination of the 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 scheme, the rock test system based on multi-field coupling effect can orderly allocate different types of test parameters, so that the rock test can comprehensively cover the combination of various geological conditions and environmental factors, especially the gradient allocation of osmotic pressure, temperature and pH parameters, allowing 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 effects, providing a structured experimental basis for subsequent data analysis and model building, and facilitating the discovery of interactions and potential correlations between different parameters, providing strong experimental support for in-depth research on rock properties under complex geological conditions.

[0052] The present application also provides a rock test method based on multi-field coupling effect, comprising the following steps:

[0053] Performing a splitting operation on a preselected core to form corresponding core fractures;

[0054] Performing a split operation on the core and sequentially forming a plurality of core samples of equal length;

[0055] Scanning the surface of the core fracture of each core sample to obtain initial three-dimensional data of the fracture surface corresponding to each core sample;

[0056] Fix each core sample in sequence;

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

[0058] Applying confining pressure and axial pressure to the core samples according to the confining pressure value and axial pressure value in the sample test conditions of each core sample;

[0059] Applying seepage to each core sample in a series manner with a preset basic seepage fluid according to a preset basic seepage pressure value;

[0060] Obtain outflow detection data and outflow sampling corresponding to each core sample;

[0061] Determine the corresponding 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 condition corresponding to the subsequent core sample;

[0062] According to the osmotic pressure adjustment value, corresponding bypass seepage fluid is used to apply corresponding seepage to subsequent core samples.

[0063] By adopting the above technical scheme, the rock test method based on multi-field coupling effect can control the test conditions of each core sample, so that the test can be closer to the complex geological environment, and the real-time monitoring and data acquisition mechanism allows the staff to dynamically adjust the experimental parameters. In particular, through the design of bypass seepage, the seepage pressure can be independently regulated for different rock sample sections, which further improves 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 in-depth understanding of rock seepage characteristics and multi-field coupling effects.

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

[0065] 1. The collected core 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 the test and quickly provide sufficient data guarantee for related geological engineering.

[0066] 2. The core samples obtained by splitting the same core can be subjected to serial seepage tests. The flexibility of the system 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 achieve synchronous simulation and testing of different seepage conditions and obtain corresponding core change data, thereby reducing the total time consumption of rock tests and speeding up the speed of rock tests.

[0067] 3. By controlling the test conditions of each core sample, including confining pressure, axial pressure, seepage pressure, seepage fluid pH value and seepage fluid temperature, the test can be closer to the complex geological environment. The real-time monitoring and data acquisition mechanism allows the staff to dynamically adjust the experimental parameters. In particular, through the design of bypass seepage, the seepage pressure can be independently adjusted for different rock sample sections, which further improves 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 in-depth understanding of rock seepage characteristics and multi-field coupling effects. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0069] Figure 2 It is a process schematic diagram of a rock testing method based on multi-field coupling effect of the present invention. DETAILED DESCRIPTION

[0070] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0071] The embodiments of the present application are further described in detail below in conjunction with the drawings in the specification.

[0072] refer to Figure 1 The present invention provides a rock test system based on multi-field coupling effect, which is used to perform synchronous tests on multiple rock samples under different working conditions at the same time. The rock test system based on multi-field coupling effect includes:

[0073] A rock sample preprocessing module 10 is used to split the collected rock core to form rock core cracks for seepage and to divide the rock core to form a plurality of rock core samples of equal length;

[0074] The laser scanning module 20 is used to perform three-dimensional scanning on the surface of the core fracture to obtain a three-dimensional image;

[0075] A plurality of rock sample pressurizing modules 30, used to apply pressure to the core samples;

[0076] A series seepage module 40 is used to perform seepage on a plurality of core samples in a series manner;

[0077] The temperature control module 50 is used to control the temperature of the seepage liquid during the seepage;

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

[0079] The rock sample pretreatment module 10, the laser scanning module 20, the rock sample pressurizing module 30, the serial seepage module 40, and the temperature control module 50 are respectively connected to the central control module 60 by communication, the temperature control module 50 is connected to the serial seepage module 40 in an adjustable temperature manner, and the serial seepage module 40 connects the core samples in series in a unidirectional manner;

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

[0081] The rock sample pretreatment module 10 is mainly used to pretreatment the collected rock core so as to generate rock fractures for seepage pressure, and to divide the rock core into a plurality of equal-length segments for synchronous testing under different test conditions.

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

[0083] The rock sample pressurizing module 30 is mainly used to apply different values ​​of confining pressure and axial pressure to each core sample after the core is divided, so as to realize different test conditions synchronously.

[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 liquid applied by the series seepage module 40 seeps into the first rock sample, and then the seepage liquid seeping out of the first rock sample will seep into the second rock sample, and the seepage liquid seeping out of the second rock sample will seep into the third rock sample, and so on, and finally the seepage liquid seeps out from the last rock sample.

[0085] The temperature control module 50 is mainly used to control the temperature of the series permeation module 40 to maintain the temperature of the seepage fluid that seeps into each rock sample to the set test temperature condition.

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

[0087] Through the above technical scheme, 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, and can also reduce the time required for the test, and can quickly provide sufficient data guarantee for related geological engineering.

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

[0089] The total seepage inlet 41 is mainly used to apply the corresponding basic seepage to the first rock sample. The seepage applied through the total 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 one-way flow guide 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 seeps out from the series seepage outlet 42 corresponding to the last core sample.

[0090] Each of the serial seepage outlets 42 is mainly used to provide a seepage outlet for the seepage fluid of each core sample, and the seepage fluid can be collected and detected at the serial seepage outlet 42 through each of the detection modules 44, and the seepage fluid seeping from the corresponding core sample can be sampled and detected through the serial seepage outlet 42, for example, the ion concentration corresponding to the core can be measured.

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

[0092] By connecting the serial seepage port 42 corresponding to the previous core sample and the serial seepage port 46 corresponding to the next core sample through the one-way flow guide pipe 43, the seepage fluid from the previous core sample can enter the next core sample.

[0093] Each of the detection modules 44 is mainly used to detect parameters of the seepage fluid at each location, for example, data such as the temperature, pressure, pH value, ion concentration, etc. 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 adjust the bypass seepage according to the data obtained by the detection module 44, so that the basic seepage in the one-way guide pipe 43 and the bypass seepage in the bypass seepage pipe 45 can be combined and reach the seepage test condition corresponding to the core sample.

[0095] Each of the serial seepage ports 46 is mainly used to connect the one-way flow guide pipe 43 and the bypass seepage pipe 45, and to combine the seepage fluid in the one-way flow guide pipe 43 and the bypass seepage pipe 45 to infiltrate into the cracks of the corresponding core sample; and the detection module 44 detects corresponding data at the serial seepage ports 46, and the seepage fluid infiltrating the core sample can be dynamically adjusted according to the detected data.

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

[0097] Each of the 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 separately storing the leachate of the basic seepage and the bypass seepage in each of the liquid storage modules 48, the influence of the seepage fluid on rock fractures without adjustment can be tested simultaneously.

[0098] Through the above technical scheme, the rock test system based on multi-field coupling effect can perform serial seepage tests on core samples obtained by segmenting the same core, and the flexibility of the system 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 to achieve synchronous simulation and testing of different seepage conditions, and obtain corresponding core change data, thereby reducing the total time consumption of rock tests and speeding up the speed of rock tests.

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

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

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

[0102] A2, respectively fixing each core sample to the corresponding rock sample pressurizing module 30;

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

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

[0105] The sample test conditions are various test parameters of the rock test corresponding to each core sample, such as the pressure value of the confining pressure, the pressure value of the axial pressure, the pressure value of the seepage fluid, the temperature of the seepage fluid, and the pH value of the seepage fluid, that is, the stress field, seepage field, chemical field and other related environmental fields. Different test conditions are generated by combining different conditions and parameters. Multiple environments can be simulated to test the core samples to obtain the changes of the core samples under the coupling of different environmental conditions, so as to provide sufficient rock property reference data for related geological engineering.

[0106] A4, applying confining pressure and axial pressure to the core samples through the rock sample pressurizing module 30 according to the confining pressure value and axial pressure value in the sample test conditions of each core sample;

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

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

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

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

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

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

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

[0114] A6, obtaining corresponding outflow detection data and outflow sampling through the corresponding detection module 44 at the serial seepage outlet 42 corresponding to each core sample;

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

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

[0117] A7, determining a corresponding 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 condition corresponding to the subsequent core sample;

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

[0119] The seepage pressure adjustment value is a pressure value determined according to the seepage pressure value and the seepage pressure value in the sample test condition corresponding to the subsequent core sample;

[0120] The subsequent core sample is the next core sample of the current core sample in the series seepage, that is, the core sample that will be infiltrated after the seepage fluid of the current core sample seeps out;

[0121] Since the seepage fluid of the core sample still has a certain pressure value, it can provide a certain pressure value for the seepage pressure condition of the subsequent core sample. Then, according to the seepage pressure value required to be reached under the test condition corresponding to the subsequent core sample, it is calculated how much pressure value is required to reach the test condition, and then the corresponding seepage pressure value is adjusted and applied through the corresponding bypass seepage pipe 45.

[0122] A8, adjusting 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 a corresponding pressure value, so that the seepage acting on the subsequent core sample reaches the seepage pressure value of the test condition.

[0124] A9, applying corresponding seepage with corresponding bypass seepage fluid to the corresponding bypass seepage pipe 45 through the hydraulic module 47;

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

[0126] On the one hand, the seepage fluid seeping out of the previous core sample can provide partial seepage pressure, which can simulate the continuous process of the seepage fluid penetrating 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 test system based on multi-field coupling effect can control the test conditions of each core sample, including confining pressure, axial pressure, seepage fluid pressure, seepage fluid pH value and seepage fluid temperature, so that the test can be closer to the complex geological environment. The real-time monitoring and data acquisition mechanism allows the staff to dynamically adjust the experimental parameters. In particular, through the design of bypass seepage, the seepage pressure can be independently adjusted for different rock sample sections, which further improves 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 in-depth understanding of rock seepage characteristics and multi-field coupling effects.

[0128] Furthermore, the rock test strategy also includes the following steps for pre-processing and generating core samples:

[0129] B1, performing a splitting operation on a preselected rock core by the splitting module 11 of the rock sample preprocessing module 10 to form corresponding rock core fractures;

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

[0131] B2, performing a splitting operation on the rock core by the splitting module 12 of the rock sample preprocessing module 10 and sequentially forming a plurality of rock core samples of equal length;

[0132] The core samples are blocks of equal length formed by splitting the split core through the splitting module 12 .

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

[0134] The core samples are fixed in sequence, and when the seepage field is applied to each core sample, the process of seepage fluid penetrating in the core fractures of the complete core can be better simulated.

[0135] Through the above steps, the rock test system based on the multi-field coupling effect can obtain multiple core samples of equal length by splitting and dividing the core, which can ensure the consistency of the cost and characteristics of each core sample. The core samples divided with equal length can avoid excessive errors in rock tests caused by different lengths. By fixing the core samples in sequence, the continuity of the core cracks can be simulated during the seepage process to ensure the validity of the test data.

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

[0137] C1, maintaining 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 through the temperature control module 50 according to a preset basic temperature;

[0138] The basic temperature is a pre-set temperature value, which is used to determine the temperature of the seepage fluid applied to the first core sample, that is, the temperature value of the basic seepage fluid, and the initial temperature value of the bypass seepage fluid corresponding to each core sample;

[0139] The basic temperature can be determined based on the temperature value of the first core sample in the test condition. On the one hand, the seepage fluid can be used to enable the first core sample to reach a temperature that meets the test condition. On the other hand, the bypass seepage fluid corresponding to other core samples can also have a certain initial temperature, which is convenient for subsequent rapid heating to the temperature value in the corresponding test condition.

[0140] C2, determining the corresponding seepage temperature value in the outflow detection data of each core sample, and determining the corresponding seepage temperature value in the sample test conditions corresponding to the subsequent core samples;

[0141] The seepage temperature value is the temperature value of the osmotic fluid seeping from the core sample;

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

[0143] C3, adjusting 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 according to the seepage temperature value and the seepage temperature value.

[0144] Usually, the seepage fluid seeping out of the core sample will still have a certain temperature. By determining the seepage temperature value of the seepage fluid and the temperature value that the subsequent core samples need 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 samples meets the requirements of the test conditions.

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

[0146] Furthermore, the rock test strategy further comprises the following steps:

[0147] D1, preparing the corresponding basic seepage fluid according to the preset basic pH value;

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

[0149] D2, determining the corresponding seepage pH value in the outflow detection data of each core sample, and determining the corresponding seepage pH value in the sample test conditions corresponding to the subsequent core samples;

[0150] The seepage pH is the pH of the osmotic fluid seeping from the core sample;

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

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

[0153] The seepage pH value and the seepage pH value can provide a data basis for adjusting the pH value of the bypass seepage fluid. The pH value of the bypass seepage fluid can be changed by adjusting the pH value in the liquid storage module 48 in a dynamic manner, and the pH value of the seepage fluid entering the subsequent core sample can be further made to meet the requirements of the test conditions; for example, distilled water or corresponding acid can be dynamically added to the liquid storage module 48 of the bypass seepage fluid according to the seepage pH value and the seepage pH value to achieve pH value adjustment.

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

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

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

[0157] The sample number is the number corresponding to each core sample. For example, when a core is split from top to bottom, each core sample generated is numbered in ascending order.

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

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

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

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

[0162] E4, assign all preset osmotic pressure test parameters to corresponding sample numbers in order from small to large;

[0163] The seepage pressure test parameters are pre-set seepage pressure values ​​that need to be tested. Since the seepage pressure values ​​will be transmitted to subsequent core samples through the seepage fluid, it is necessary to assign corresponding seepage pressure test parameters to each core sample in order from small to large.

[0164] E5, assign all preset temperature test parameters to the corresponding sample numbers in order from small to large;

[0165] The temperature test parameter is a pre-set temperature value of the seepage fluid that needs to be tested. Since the temperature of the seepage fluid will also be transmitted to the subsequent core samples through the seepage fluid, it is necessary to assign corresponding temperature test parameters to each core sample in order from small to large.

[0166] E6, assign all preset pH test parameters to the corresponding sample numbers in order from large to small;

[0167] The pH test parameter is the pre-set pH value of the seepage fluid that needs to be tested. Since the pH value of the seepage fluid will also be transmitted to the subsequent core samples through the seepage fluid, it is necessary to assign corresponding pH test parameters to each core sample from large to small.

[0168] E7, generating the sample test conditions of the corresponding core samples according to the combination of the 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 according to the test parameter combinations assigned to each sample number.

[0170] Through the above steps, the rock test system based on multi-field coupling effect can orderly allocate different types of test parameters so that the rock test can comprehensively cover the combination of various geological conditions and environmental factors, especially the gradient distribution of osmotic pressure, temperature and pH parameters, allowing 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, providing a structured experimental basis for subsequent data analysis and model building, which is conducive to discovering the interactions and potential correlations between different parameters, and provides strong experimental support for in-depth research on rock properties under complex geological conditions.

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

[0172] F1, performing a splitting operation on the pre-selected core to form corresponding core fractures;

[0173] F2, splitting the core and sequentially forming multiple core samples of equal length;

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

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

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

[0177] F6, applying confining pressure and axial pressure to the core samples according to the confining pressure value and axial pressure value in the sample test conditions of each core sample;

[0178] F7, applying seepage to each core sample in a series manner with a preset basic seepage fluid according to a preset basic seepage pressure value;

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

[0180] F9, determining a corresponding 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 condition corresponding to the subsequent core sample;

[0181] F10, applying corresponding seepage to subsequent core samples with corresponding bypass seepage fluid according to the seepage pressure adjustment value.

[0182] Through the above steps, the rock test method based on multi-field coupling effect can control the test conditions of each core sample so that the test can be closer to the complex geological environment. The real-time monitoring and data acquisition mechanism allows the staff to dynamically adjust the experimental parameters. In particular, through the design of bypass seepage, independent seepage pressure regulation can be performed for different rock sample sections, which further improves 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 in-depth understanding of rock seepage characteristics and multi-field coupling effects.

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

Claims

1. A rock test system based on multi-field coupling effect, characterized in that: include: A rock sample pre-processing module, used for splitting the collected rock core to form rock core fractures for seepage and for dividing the rock core to form a plurality of rock core samples of equal length; A laser scanning module is used to perform three-dimensional scanning on the surface of the core fracture to obtain a three-dimensional image; Multiple rock sample pressurization modules for applying pressure to core samples; A series seepage module is used to perform seepage on multiple core samples in a series manner; A temperature control module, used to control the temperature of the seepage liquid during seepage; Central control module, used to control other modules and obtain corresponding data; The rock sample pretreatment module, the laser scanning module, the rock sample pressurizing module, the series seepage module, and the temperature control module are respectively connected to the central control module by communication, the temperature control module is connected to the series seepage module in an adjustable manner, and the series seepage module connects the core samples in series in a unidirectional manner; Wherein, the rock sample preprocessing 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.

2. The rock test system based on multi-field coupling effect according to claim 1 is characterized in that: The series seepage module includes a total seepage inlet, multiple series seepage outlets, multiple unidirectional flow guide pipes, multiple detection modules, multiple bypass seepage pipes, multiple series seepage outlets, multiple water pressure modules and multiple liquid storage modules. Each of the unidirectional flow guide pipes is unidirectionally connected between the corresponding series seepage outlets and the series seepage outlets. Each of the detection modules is measurably connected to the total seepage inlet, each of the series seepage outlets and each of the series seepage outlets. Each of the bypass seepage pipes is correspondingly connected to each of the series seepage outlets. The total seepage inlet, each of the bypass seepage pipes and each of the liquid storage modules are conductively connected to the corresponding water pressure module.

3. The rock test system based on multi-field coupling effect according to claim 2 is characterized in that: Further comprising a rock testing strategy, the rock testing strategy comprising 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 corresponding to each core sample; A2, respectively fixing each core sample to the corresponding rock sample pressurizing module; A3, set the corresponding sample test conditions for each core sample; A4, applying confining pressure and axial pressure to the core samples through the rock sample pressurization module according to the confining pressure value and axial pressure value in the sample test condition of each core sample; A5, applying seepage to each core sample in series with a preset basic seepage fluid through the water pressure module corresponding to the total seepage inlet according to a preset basic seepage pressure value; A6, obtaining corresponding outflow detection data and outflow sampling through the corresponding detection module at the series seepage outlet corresponding to each core sample; A7, determining a corresponding 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 condition corresponding to the subsequent core sample; A8, adjusting the water pressure module corresponding to each subsequent core sample according to the osmotic pressure adjustment value; A9, applying corresponding seepage with corresponding bypass seepage fluid to the corresponding bypass seepage pipeline through the hydraulic module.

4. The rock test system based on multi-field coupling effect according to claim 3 is characterized in that: The rock test strategy further includes the following steps for pre-processing the generated core samples: B1, performing a splitting operation on a preselected rock core by the splitting module of the rock sample preprocessing module to form corresponding rock core fractures; B2, performing a segmentation operation on the rock core by the segmentation module of the rock sample preprocessing module and sequentially forming a plurality of rock core samples of equal length; B3, sequentially fixing each core sample to the corresponding rock sample pressurizing module.

5. The rock test system based on multi-field coupling effect according to claim 4 is characterized in that: The rock testing strategy further comprises the following steps: C1, maintaining the temperature of the basic seepage fluid in each of the liquid storage modules and the bypass seepage fluid corresponding to each core sample through the temperature control module according to a preset basic temperature; C2, determining the corresponding seepage temperature value in the outflow detection data of each core sample, and determining the corresponding seepage temperature value in the sample test conditions corresponding to the subsequent core samples; C3, adjusting the temperature of the bypass seepage fluid in the bypass seepage pipeline corresponding to the subsequent core sample through the temperature control module according to the seepage temperature value and the seepage temperature value.

6. The rock test system based on multi-field coupling effect according to claim 5 is characterized in that: The rock testing strategy further comprises the following steps: D1, preparing the corresponding basic seepage fluid according to the preset basic pH value; D2, determining the corresponding seepage pH value in the outflow detection data of each core sample, and determining the corresponding seepage pH value in the sample test conditions corresponding to the subsequent core samples; D3, adjusting the pH value of the bypass seepage fluid in the fluid storage module corresponding to the core sample according to the seepage pH value and the seepage pH value.

7. The rock test system based on multi-field coupling effect according to claim 6 is characterized in that: The rock test strategy further includes the following steps for setting the sample test conditions for each core sample: E1, when the segmentation module segments the core, a corresponding sample number is sequentially set for each generated core sample; E2, assign all preset confining pressure test parameters to the corresponding sample numbers; E3, assign all preset axial compression test parameters to the corresponding sample numbers; E4, assign all preset osmotic pressure test parameters to corresponding sample numbers in order from small to large; E5, assign all preset temperature test parameters to the corresponding sample numbers in order from small to large; E6, assign all preset pH test parameters to the corresponding sample numbers in order from large to small; E7, generating the sample test conditions of the corresponding core samples according to the combination of the confining pressure test parameters, axial pressure test parameters, temperature test parameters and pH test parameters assigned to each sample number.

8. A rock test method based on multi-field coupling effect, characterized in that: The following steps are involved: Performing a splitting operation on a preselected core to form corresponding core fractures; Performing a split operation on the core and sequentially forming a plurality of core samples of equal length; Scanning the surface of the core fracture of each core sample to obtain initial three-dimensional data of the fracture surface corresponding to each core sample; Fix each core sample in sequence; Set corresponding sample test conditions for each core sample; Applying confining pressure and axial pressure to the core samples according to the confining pressure value and 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 basic seepage fluid according to a preset basic seepage pressure value; Obtain outflow detection data and outflow sampling corresponding to each core sample; Determine the corresponding 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 condition corresponding to the subsequent core sample; According to the osmotic pressure adjustment value, corresponding bypass seepage fluid is used to apply corresponding seepage to subsequent core samples.

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