Granite weathered soil atmospheric disintegration experiment system and experiment method
By using humidification and drying devices in the atmospheric disintegration experimental system for weathered granite soil to simulate variable climatic conditions, the problems of low experimental measurement accuracy and large error in existing technologies have been solved, and accurate simulation and high-precision measurement of soil sample disintegration characteristics have been achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- GUANGZHOU URBAN PLANNING & DESIGN SURVEY RES INST
- Filing Date
- 2023-05-30
- Publication Date
- 2026-05-12
AI Technical Summary
Existing experimental apparatus and methods for the disintegration of weathered granite soil cannot accurately simulate variable climatic conditions, resulting in low experimental measurement accuracy and large errors. Furthermore, the hydrostatic pressure in the immersion disintegration experiment does not reflect the actual disintegration characteristics of the soil sample.
An atmospheric disintegration experimental system for weathered granite soil was designed, which includes a humidification device and a drying device. Water is sprayed through nozzles to simulate different rainfall intensities, and heating lamps and ventilation fans are used to simulate a dry environment. Pressure detectors and data acquisition devices are used to record pressure data during the soil sample disintegration process, thereby reducing the disturbance of hydrostatic pressure on the soil sample.
It enables accurate simulation of soil sample disintegration process under variable climatic conditions, improves experimental measurement accuracy, reduces experimental errors, and ensures that the soil sample disintegration characteristics are consistent with the actual situation.
Smart Images
Figure CN116519585B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of geotechnical engineering analysis and testing technology, and in particular to an experimental system and method for atmospheric disintegration of weathered granite soil. Background Technology
[0002] With the acceleration of urbanization and the increasing workload of engineering construction, weathered granite soil, a common geotechnical engineering carrier, is subject to intensified human disturbance. In South my country, where weathered granite soil is widely distributed and rainfall is frequent, it is prone to geological disasters such as ground subsidence and landslides, causing major engineering accidents and seriously affecting engineering construction and threatening people's lives and property. These issues are closely related to the disintegration properties of weathered granite soil; therefore, studying the disintegration properties of weathered granite soil has significant theoretical and practical implications for engineering construction.
[0003] The disintegration of weathered granite soil refers to the phenomenon of its disintegration upon contact with external water. Stress concentration and loss of structural strength generated during water absorption are key causes of this disintegration. In reality, influenced by regionally variable climates, weathered granite soil is subjected to repeated wetting and drying processes over a long period, leading to damage to its internal microstructure and a continuous deterioration of its mechanical properties, ultimately resulting in disintegration. Therefore, the complex wetting and drying environment brought about by variable climates is a significant factor affecting the disintegration of weathered granite soil.
[0004] Currently, existing experimental apparatus and methods for the disintegration of weathered granite soil have certain limitations. Most existing disintegration experiments on weathered granite soil focus on immersing soil samples in water to simulate the rapid saturation and disintegration process caused by sudden heavy rain. However, in most immersion disintegration experiments, hydrostatic pressure generates additional stress within the soil sample, leading to disintegration characteristics that differ from actual conditions. Furthermore, existing experimental studies on the impact of climate change on the disintegration characteristics of weathered granite soil are mostly limited to setting up simple periodic wet-dry alternation processes. These experimental apparatuses cannot simulate dry environments such as natural air drying and high-temperature sunlight, nor can they reflect humidifying environments with varying rainfall intensities. This is inconsistent with the diverse and changing climatic conditions of reality, resulting in low measurement accuracy and large experimental errors in existing weathered granite soil disintegration experiments. Summary of the Invention
[0005] In view of the above problems, the purpose of this invention is to provide an atmospheric disintegration test system and method for weathered granite soil, so as to solve the problems that the soil sample disintegration characteristics simulated by the existing water immersion disintegration test device are different from the actual situation, and cannot simulate the real variable climate environment conditions, resulting in low experimental measurement accuracy and large experimental errors.
[0006] To achieve the above objectives, the present invention adopts the following technical solution:
[0007] One aspect of the present invention is to provide an experimental system for the atmospheric disintegration of weathered granite soil, comprising:
[0008] The test chamber is equipped with a soil sample holder for placing the soil sample to be tested, and an open container with its opening facing upwards is placed below the soil sample holder.
[0009] A humidification device is installed above the soil sample holder, and the humidification device is equipped with a nozzle for spraying water onto the soil sample to be tested;
[0010] A drying device is installed on the side wall of the experimental chamber, and the drying device is used to dry the soil sample to be tested;
[0011] A pressure detector is located on the underside of the open container;
[0012] A data acquisition device is connected to the pressure detector, and the data acquisition device is used to acquire the pressure data detected by the pressure detector.
[0013] Preferably, a water-proof baffle is provided on the lower side of the open container, and the pressure detector is located on the lower side of the water-proof baffle.
[0014] Preferably, the side wall of the experimental chamber is provided with a movable baffle, and the movable baffle is slidably used to open or close the experimental chamber.
[0015] Preferably, the drying device includes a heating lamp and a ventilation fan, the heating lamp being installed above the side wall of the experimental chamber, and the ventilation fan being installed on the side wall of the experimental chamber.
[0016] Preferably, the humidification device includes:
[0017] A water storage tank is located outside the experimental chamber;
[0018] A water pump is installed inside the water storage tank;
[0019] A water pipe, one end of which is connected to the water pump, and the other end of which is connected to the nozzle;
[0020] A flow meter is installed on the water pipe;
[0021] A control valve is installed on the water pipe.
[0022] Preferably, the top of the experimental chamber is provided with a cover, and the cover is provided with a water injection hole. The water injection hole is located above the soil sample holder, and the nozzle enters the interior of the experimental chamber through the water injection hole.
[0023] Another aspect of the present invention is to provide an experimental method for the atmospheric disintegration experimental system of granite weathered soil as described above, comprising the following steps:
[0024] Step S1: Place the soil sample to be tested on the soil sample holder;
[0025] Step S2: Calculate the corresponding water flow rate based on the set rainfall intensity, and humidify the soil sample to be tested through the nozzle;
[0026] Step S3: After the humidification process reaches the first set time, turn off the nozzle and record the pressure data detected by the pressure detector through the data acquisition device.
[0027] Step S4: Dry the soil sample to be tested using a drying device for a second set time, and record the pressure data detected by the pressure detector using a data acquisition device;
[0028] Step S5: Remove and clean the open container, and place the open container inside the experimental chamber.
[0029] Step S6: Repeat steps S2 to S5 until the set number of repetitions is reached;
[0030] Step S7: Process the data recorded by the data acquisition device during the cycle to obtain the real-time disintegration rate and disintegration speed of the soil sample during the experiment.
[0031] Preferably, in step S7, the real-time disintegration rate of the soil sample to be tested in the nth cycle is calculated using the following formula:
[0032]
[0033] In the formula, A nt Let m be the real-time disintegration rate of the soil sample in the nth cycle, M be the real-time reading of the pressure detector, and m be the real-time disintegration rate of the soil sample in the nth cycle. b m is the total mass of the open container and the watertight baffle. w denoted as , where is the total mass of water in the open container, and m0 is the initial dry mass of the soil sample to be tested.
[0034] Preferably, in step S7, the disintegration rate of the soil sample to be tested in the nth cycle is calculated using the following formula:
[0035]
[0036]
[0037]
[0038] In the formula, V5 represents the soil sample disintegration rate at which the soil sample disintegration rate reaches 5% in the nth cycle; V 10 V represents the soil sample disintegration rate at which the soil sample disintegration rate reaches 10% in the nth cycle; 15A5 represents the soil sample disintegration rate when the soil sample disintegration rate reaches 15% in the nth cycle; A5 represents the soil sample disintegration rate of 5% in the nth cycle; A 10 This indicates that the soil sample disintegration rate is 10% in the nth cycle; A 15 t5 indicates that the soil sample disintegration rate is 15% in the nth cycle; t5 indicates the duration of the wetting process when the soil sample disintegration rate reaches 5% in the nth cycle; t 10 t represents the duration of the wetting process when the soil sample disintegration rate reaches 10% in the nth cycle; 15 This indicates the duration of the wetting process when the soil sample disintegration rate reaches 15% in the nth cycle.
[0039] Preferably, in step S7, the total disintegration rate of the soil sample after n cycles is calculated using the following formula:
[0040]
[0041] In the formula, M i This represents the pressure detector reading at the end of the i-th cycle of humidification, m. b The total mass of the open container and the watertight baffle is expressed in m. w A represents the total mass of water in an open container. n The total disintegration rate of the soil sample after n cycles is represented by m0, where m0 is the initial dry mass of the soil sample and i represents the index of the cycle number.
[0042] Compared with existing technologies, the atmospheric disintegration experimental system and method for weathered granite soil of this invention have the following advantages:
[0043] The atmospheric disintegration experimental system for weathered granite soil of this invention includes a humidification device and a drying device within the experimental chamber. The humidification device humidifies the soil sample to simulate different rainfall intensities, while the drying device dries the sample to simulate different drying environments. This allows for the simulation of soil disintegration processes under various scenarios, better reflecting real-world, variable climate conditions. Furthermore, by placing the soil sample on a support and positioning the humidification device above it, the system avoids the additional stress caused by hydrostatic pressure within the soil sample during water immersion disintegration experiments, which could lead to discrepancies between the simulated and actual disintegration characteristics. This ensures the simulation scenarios closely match reality, effectively reducing disturbance to the soil sample and thus improving the measurement accuracy and minimizing experimental errors. Attached Figure Description
[0044] Figure 1 This is an overall schematic diagram of the atmospheric disintegration experimental system for granite weathered soil described in an embodiment of the present invention;
[0045] Figure 2 This is a schematic diagram of the internal cross-section of the experimental chamber in an embodiment of the present invention;
[0046] Figure 3 This is a three-dimensional schematic diagram of the interior of the experimental chamber in an embodiment of the present invention;
[0047] Figure 4 This is a three-dimensional schematic diagram of the soil sample holder in an embodiment of the present invention;
[0048] In the diagram, 1 – experimental chamber; 11 – chamber lid; 12 – water injection hole; 13 – insertion hole; 14 – ventilation hole; 15 – wire hole; 16 – movable baffle; 21 – pressure sensor; 22 – control instrument; 3 – humidification device; 31 – nozzle; 32 – water pipe; 33 – flow meter; 34 – control valve; 35 – water pump; 36 – water storage tank; 4 – drying device; 41 – heating lamp; 42 – ventilation fan; 5 – soil sample holder; 51 – support net; 52 – connecting arm; 53 – connecting plate; 6 – open container; 7 – water-proof baffle; 8 – soil sample to be tested. Detailed Implementation
[0049] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0050] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0051] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.
[0052] like Figure 1 - Figure 4As shown in the figure, an atmospheric disintegration experimental system for weathered granite soil according to an embodiment of the present invention includes an experimental chamber 1, a humidification device 3, a drying device 4, and a data acquisition device. The experimental chamber 1 is equipped with a soil sample holder 5 for placing a soil sample 8 to be tested. The soil sample holder 5 is fixed to the side wall of the experimental chamber 1 by screws. Below the soil sample holder 5, an open container 6 with its opening facing upwards is provided to receive dripping water and disintegrating material falling from the soil sample 8 on the soil sample holder 5. The humidification device 3 is located above the soil sample holder 5 and is equipped with a spray nozzle for spraying water onto the soil sample 8. The head 31 sprays water onto the soil sample 8 on the soil sample holder 5 to simulate different rainfall intensities. The drying device 4 is installed on the side wall of the experimental chamber 1 to dry the soil sample 8 and simulate different drying environments. The pressure detector is set on the lower side of the open container 6 to detect the pressure data of the open container 6 and the water and disintegrating material inside it. The data acquisition device is connected to the pressure detector to collect the pressure data detected by the pressure detector. By processing the pressure data, the real-time disintegration rate and disintegration speed of the soil sample 8 can be obtained.
[0053] This invention uses a humidification device 3 to humidify the soil sample 8 under test, simulating environments with different rainfall intensities, and a drying device 4 to dry the soil sample 8 under test, simulating different drying environments. This allows for the simulation of the soil sample disintegration process under various scenarios, better reflecting real-world, variable climate conditions. Furthermore, the soil sample 8 is placed on a soil sample support 5, with the humidification device 3 positioned above it. Water dripping from the soil sample 8 falls into an open container 6, preventing the hydrostatic pressure from creating additional stress within the soil sample during the immersion disintegration experiment, which could cause the soil sample's disintegration characteristics to differ from reality. This ensures the simulated scenario matches actual conditions, effectively reducing disturbance to the soil sample during the experiment, thereby improving the measurement accuracy of the disintegration experiment and reducing experimental errors. Moreover, this invention has a simple structure, accurate data acquisition, and is easy to operate.
[0054] The pressure detector is preferably a pressure sensor 21. The detection data from the pressure sensor 21 is transmitted to the data acquisition device via a control instrument 22. The side wall of the experimental chamber 1 is provided with a wire hole 15 for the data transmission line to pass through. The control instrument 22 is connected to the data acquisition device via a USB interface. By using the pressure sensor 21 to measure the change in soil sample mass, the ratio of the soil sample's lost dry mass to its initial dry mass over a certain period is used as the soil sample's disintegration rate, thus improving the accuracy of soil sample disintegration rate measurement.
[0055] In this embodiment, a water-proof baffle 7 is provided on the lower side of the open container 6, and the pressure detector is located on the lower side of the water-proof baffle 7. The pressure detector detects the total pressure of the water-proof baffle 7 and the open container 6. The water-proof baffle 7 isolates the water in the open container 6, preventing the water in the open container 6 from seeping out and affecting the detection results of the pressure detector, thus ensuring the accuracy of the detection results of the pressure detector.
[0056] The experimental chamber 1 is preferably made of transparent acrylic sheet, which facilitates the installation of a camera on the outside of the experimental chamber 1 to record the soil sample disintegration process. The soil sample holder 5 includes a support net 51 and connecting arms 52 fixed on both sides of the support net 51. The ends of the connecting arms 52 are provided with connecting plates 53, which are fixed to the side wall of the experimental chamber 1 by screws. The support net 51 is circular, preferably made of metal grid. The fixed height of the soil sample holder 5 is slightly higher than the upper edge of the open container 6. The size of the water-proof baffle 7 below the open container 6 is slightly smaller than the size of the experimental chamber 1 to ensure the reliability of the experimental data.
[0057] In this embodiment, a movable baffle 16 is slidably provided on the side wall of the experimental chamber 1. Sliding the movable baffle 16 opens or closes the experimental chamber 1. Opening the experimental chamber 1 allows the open container 6 to be removed, facilitating cleaning of the open container 6. By sliding the movable baffle 16 on the side wall, the open container 6 can be removed and placed in during the experiment, which helps to reduce human disturbance to the soil sample and shorten the experimental time.
[0058] In this embodiment, the drying device 4 includes a heating lamp 41 and a ventilation fan 42. The heating lamp 41 is installed above the side wall of the experimental chamber 1, and its heating temperature can be adjusted via a temperature control switch, with a range of 20°C to 70°C. The ventilation fan 42 is installed on the side wall of the experimental chamber 1, and its wind speed can be adjusted via a knob, with a range of 0 m / s to 8.5 m / s. The side wall of the experimental chamber 1 is provided with an insertion hole 13 and a ventilation hole 14. The heating lamp 41 is installed on the side wall of the experimental chamber 1 through the insertion hole 13, and the ventilation fan 42 is installed on the side wall of the experimental chamber 1 through the ventilation hole 14. By controlling the heating lamp 41 and the ventilation fan 42, different drying environments such as high-temperature sunlight and natural air drying can be simulated. The temperature control switch and the ventilation fan 42 knob can be used to adjust the temperature and wind speed of the drying environment, facilitating the study of changes in the disintegration properties of granite weathered soil under multiple scenarios.
[0059] In this embodiment, the humidification device 3 includes a water storage tank 36, a water pump 35, a water pipe 32, a flow meter 33, and a control valve 34. The water storage tank 36 is located outside the experimental chamber 1 and is used to store water. The water pump 35 is installed inside the water storage tank 36 and is used to transport the water from the water storage tank 36 to the nozzle 31. One end of the water pipe 32 is connected to the water pump 35, and the other end of the water pipe 32 is connected to the nozzle 31. The flow meter 33 is installed on the water pipe 32, and the control valve 34 is installed on the water pipe 32. The water in the water storage tank 36 is sprayed out through the nozzle 31 by the water pump 35. The flow rate of the spray from the nozzle 31 is precisely controlled by the flow meter 33 and the control valve 34, allowing for more accurate simulation of rainfall intensity conditions under different scenarios such as humid and rainy conditions and sudden downpours. The control valve 34 is preferably a solenoid valve for convenient control.
[0060] In this embodiment, the top of the experimental chamber 1 is provided with a cover 11, and the cover 11 is provided with a water injection hole 12. The water injection hole 12 is located above the soil sample holder 5, and the nozzle 31 enters the interior of the experimental chamber 1 through the water injection hole 12. The water injection hole 12 is located directly above the soil sample holder 5, so that the nozzle 31 is positioned directly above the soil sample holder 5, allowing the nozzle 31 to spray water evenly onto the soil sample 8 to be tested on the soil sample holder 5. The radius of the water injection hole 12 is slightly larger than the radius of the nozzle 31, and the radius of the soil sample 8 to be tested is smaller than the radius of the nozzle 31, so that the water sprayed by the nozzle 31 can cover the soil sample 8 to be tested. The diameter of the water injection hole 12 is 12 cm, and the diameter of the nozzle 31 is 10 cm.
[0061] In this embodiment, the experimental chamber 1 has a rectangular structure with a length of 80cm, a width of 50cm, and a height of 40cm. The water-proof baffle 7 has a length of 76cm and a width of 46cm. The movable baffle 16 has a length of 80cm and a height of 15cm. The open container 6 has a length of 70cm, a width of 40cm, and a height of 10cm. The experimental chamber 1, the water-proof baffle 7, the movable baffle 16, and the open container 6 are all made of transparent acrylic sheet with a thickness of 0.5cm.
[0062] The experimental method of the granite weathered soil atmospheric disintegration test system of the present invention involves conducting disintegration tests on granite weathered soil samples using the aforementioned granite weathered soil atmospheric disintegration test system. The experimental method includes the following steps:
[0063] Step S1: Place the soil sample 8 to be tested on the soil sample holder 5. The soil sample 8 is a weathered granite soil sample. The soil sample 8 is cylindrical with a diameter of 61.8 mm and a height of 40 mm.
[0064] Step S2: Calculate the corresponding water flow rate according to the set rainfall intensity, and humidify the soil sample 8 to be tested through the nozzle 31. The degree of humidification is set by adjusting the flow rate of the nozzle 31 through the flow meter 33 and the solenoid valve. Turn on the water pump 35 to transport the water in the water storage tank 36 to the nozzle 31.
[0065] Step S3: After the humidification process reaches the first set time, the nozzle 31 is turned off, and the pressure data detected by the pressure detector is recorded through the data acquisition device.
[0066] Step S4: The soil sample 8 to be tested is dried for a second set time using the drying device 4, and the pressure data detected by the pressure detector is recorded using the data acquisition device.
[0067] Step S5: Take out and clean the open container 6, put the open container 6 into the experimental chamber 1, open the experimental chamber 1 by sliding the movable baffle 16, take out the open container 6, drain the contents, clean the open container 6, put the open container 6 back into the experimental chamber 1, and then slide the movable baffle 16 in the opposite direction to close the experimental chamber 1.
[0068] Step S6: Repeat steps S2 to S5 until the set number of cycles is reached. In each cycle, the experimental conditions for steps S2, S3, and S4 are not entirely the same. The wetting time, drying time, rainfall intensity, drying temperature, drying wind speed, and total number of cycles in each cycle are determined by the scenario simulated by the experimental conditions, or until the granite weathered soil sample completely disintegrates. For example, the experimental conditions for the first cycle are shown in Table 1 below:
[0069] Table 1
[0070]
[0071] In Table 1, the drying temperature of 25℃ and the drying wind speed of 0m / s only represent that the heating lamp 41 or the ventilation fan 42 is turned off, and are not actual values.
[0072] Step S7: Process the data recorded by the data acquisition device during the cycle to obtain the real-time disintegration rate and disintegration speed of the soil sample during the experiment.
[0073] This invention humidifies the soil sample by calculating the water flow rate based on a set rainfall intensity, accurately simulating humidification environments under different rainfall intensities. By setting the drying temperature and wind speed of the drying device, it simulates different drying environments, achieving simulation of the soil sample disintegration process under various scenarios. This aligns with real-world, variable climate conditions, improving the accuracy of disintegration experiments and reducing experimental errors. This invention can conveniently and quickly achieve accurate simulation of different humidification and drying environments, such as hot and rainy weather, high-temperature torrential rain, and low-temperature drizzle, effectively improving the accuracy and reliability of disintegration experimental data.
[0074] Before step S1, there is also an experimental preparation step, which involves putting enough water into the water tank 36, assembling the granite weathered soil atmospheric disintegration experimental system and connecting it to the power supply; then, preparing granite weathered soil samples according to the experimental requirements.
[0075] Step S4 includes: selecting the drying mode and drying parameters according to the experimental conditions and simulated scenario. The drying modes include natural air drying, high-temperature air drying, and high-temperature drying. The three drying modes are achieved by heating lamp 41 or ventilation fan 42. The drying parameters include drying temperature and / or drying wind speed. Then, heating lamp 41 and / or ventilation fan 42 are turned on to dry the soil sample 8 according to the drying mode. The power of heating lamp 41 is adjusted to the set drying temperature by the temperature control switch, and the power of ventilation fan 42 is adjusted to the set wind speed by the knob. After the drying process reaches the experimental set time, heating lamp 41 or ventilation fan 42 is turned off.
[0076] Optionally, in step S7, the real-time disintegration rate of the soil sample to be tested in the nth cycle is calculated using the following formula:
[0077]
[0078] In the formula, A nt Let m be the real-time disintegration rate of the soil sample in the nth cycle, M be the real-time reading of the pressure detector, and m be the real-time disintegration rate of the soil sample in the nth cycle. b m is the total mass of the open container and the watertight baffle. w denoted as , where is the total mass of water in the open container, and m0 is the initial dry mass of the soil sample to be tested.
[0079] Optionally, in step S7, the disintegration rate of the soil sample to be tested in the nth cycle is calculated using the following formula:
[0080]
[0081]
[0082]
[0083] In the formula, V5 represents the soil sample disintegration rate at which the soil sample disintegration rate reaches 5% in the nth cycle; V 10 V represents the soil sample disintegration rate at which the soil sample disintegration rate reaches 10% in the nth cycle; 15 A5 represents the soil sample disintegration rate when the soil sample disintegration rate reaches 15% in the nth cycle; A5 represents the soil sample disintegration rate of 5% in the nth cycle; A 10 This indicates that the soil sample disintegration rate is 10% in the nth cycle; A 15t5 indicates that the soil sample disintegration rate is 15% in the nth cycle; t5 indicates the duration of the wetting process when the soil sample disintegration rate reaches 5% in the nth cycle; t 10 t represents the duration of the wetting process when the soil sample disintegration rate reaches 10% in the nth cycle; 15 This indicates the duration of the wetting process when the soil sample disintegration rate reaches 15% in the nth cycle.
[0084] Optionally, in step S7, the total disintegration rate of the soil sample after n cycles is calculated using the following formula:
[0085]
[0086] In the formula, M i This represents the pressure detector reading at the end of the i-th cycle of humidification, m. b The total mass of the open container and the watertight baffle is expressed in m. w A represents the total mass of water in an open container. n The total disintegration rate of the soil sample after n cycles is represented by m0, where m0 is the initial dry mass of the soil sample and i represents the index of the cycle number.
[0087] It should be noted that other specific embodiments of the atmospheric disintegration test method for granite weathered soil of the present invention are largely the same as the specific embodiments of the atmospheric disintegration test system for granite weathered soil described above, and will not be repeated here.
[0088] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.
Claims
1. An experimental method for an atmospheric disintegration test system of granite weathered soil, characterized in that, Includes the following steps: Step S1: Place the soil sample to be tested on the soil sample holder; Step S2: Calculate the corresponding water flow rate based on the set rainfall intensity, and humidify the soil sample to be tested through the nozzle; Step S3: After the humidification process reaches the first set time, turn off the nozzle and record the pressure data detected by the pressure detector through the data acquisition device. Step S4: Dry the soil sample to be tested using a drying device for a second set time, and record the pressure data detected by the pressure detector using a data acquisition device; Step S5: Remove and clean the open container, and place the open container inside the experimental chamber. Step S6: Repeat steps S2 to S5 until the set number of repetitions is reached; Step S7: Process the data recorded by the data acquisition device during the cycle to obtain the real-time disintegration rate and disintegration speed of the soil sample during the experiment. In step S7, the real-time disintegration rate of the soil sample to be tested in the nth cycle is calculated using the following formula: In the formula, A nt Let m be the real-time disintegration rate of the soil sample in the nth cycle, M be the real-time reading of the pressure detector, and m be the real-time disintegration rate of the soil sample in the nth cycle. b m is the total mass of the open container and the watertight baffle. w m0 represents the total mass of water in the open container, and m0 represents the initial dry mass of the soil sample to be tested. In step S7, the disintegration rate of the soil sample to be tested in the nth cycle is calculated using the following formula: In the formula, V5 represents the soil sample disintegration rate at which the soil sample disintegration rate reaches 5% in the nth cycle; V 10 V represents the soil sample disintegration rate at which the soil sample disintegration rate reaches 10% in the nth cycle; 15 A5 represents the soil sample disintegration rate at which the soil sample disintegration rate reaches 15% in the nth cycle; A5 represents the soil sample disintegration rate at 5% in the nth cycle; A 10 This indicates that the soil sample disintegration rate is 10% in the nth cycle; A 15 t5 indicates that the soil sample disintegration rate is 15% in the nth cycle; t5 indicates the duration of the wetting process when the soil sample disintegration rate reaches 5% in the nth cycle; t 10 This indicates the duration of the wetting process when the soil sample disintegration rate reaches 10% in the nth cycle; t 15 This indicates the duration of the wetting process when the soil sample disintegration rate reaches 15% in the nth cycle; The atmospheric disintegration experimental system for weathered granite soil includes: The test chamber is equipped with a soil sample holder for placing the soil sample to be tested, and an open container with its opening facing upwards is placed below the soil sample holder. A humidification device is installed above the soil sample holder, and the humidification device is equipped with a nozzle for spraying water onto the soil sample to be tested; A drying device is installed on the side wall of the experimental chamber, and the drying device is used to dry the soil sample to be tested; A pressure detector is located on the underside of the open container; A data acquisition device is connected to the pressure detector, and the data acquisition device is used to acquire the pressure data detected by the pressure detector.
2. The experimental method of the granite weathering soil atmospheric disintegration experimental system according to claim 1, characterized in that, In step S7, the total disintegration rate of the soil sample after n cycles is calculated using the following formula: In the formula, M i This represents the pressure detector reading at the end of the i-th cycle of humidification, m. b The total mass of the open container and the watertight baffle is expressed in m. w A represents the total mass of water in an open container. n This represents the total disintegration rate of the soil sample after n cycles, where m0 is the initial dry mass of the soil sample.
3. The experimental method of the granite weathering soil atmospheric disintegration experimental system according to claim 1, characterized in that, A water-proof baffle is provided on the lower side of the open container, and the pressure detector is located on the lower side of the water-proof baffle.
4. The experimental method of the granite weathering soil atmospheric disintegration experimental system according to claim 1, characterized in that, The side wall of the experimental chamber is provided with a movable baffle, which can be slid to open or close the experimental chamber.
5. The experimental method of the granite weathering soil atmospheric disintegration experimental system according to claim 1, characterized in that, The drying device includes a heating lamp and a ventilation fan. The heating lamp is installed above the side wall of the experimental chamber, and the ventilation fan is installed on the side wall of the experimental chamber.
6. The experimental method of the granite weathering soil atmospheric disintegration experimental system according to claim 1, characterized in that, The humidification device includes: A water storage tank is located outside the experimental chamber; A water pump is installed inside the water storage tank; A water pipe, one end of which is connected to the water pump, and the other end of which is connected to the nozzle; A flow meter is installed on the water pipe; A control valve is installed on the water pipe.
7. The experimental method of the granite weathering soil atmospheric disintegration experimental system according to claim 1, characterized in that, The experimental chamber is equipped with a lid on top, and a water injection hole is provided on the lid. The water injection hole is located above the soil sample holder, and the nozzle enters the interior of the experimental chamber through the water injection hole.