An embankment fill optimum moisture content control system

Abstract

The application discloses a kind of roadbed fill optimum moisture content control systems, comprising: experimental module, for determining optimum moisture content;Bin, for storing soil material;Moisture content determination module is connected with bin, for measuring the moisture content of soil material in bin;Conveying channel is connected with bin, for transporting soil material in bin and changing the moisture content of soil material;Weighing module is connected with conveying channel, for weighing the weight of soil material in conveying channel;Control module is connected with experimental module, bin, moisture content determination module, conveying channel and weighing module respectively, for controlling the transportation path and moisture content change of soil material according to the moisture content, optimum moisture content and weight of soil material.The system determines the optimum moisture content of soil material by experiment, and can automatically adjust the moisture content of soil material according to the optimum moisture content, improves the accuracy of moisture content control, speeds up the processing efficiency, and shortens the corresponding construction time.

Description

Technical Field

[0001] This invention belongs to the field of roadbed filling construction in road engineering, and particularly relates to an optimal moisture content control system for roadbed fill. Background Technology

[0002] The compaction degree of the embankment subgrade is a key measured item, determining the construction quality and successful acceptance of the subgrade. For the subgrade of highways, the compaction degree requirement is even stricter, needing to be greater than 96%. The selection of subgrade fill soil follows the principles of proximity and balanced fill and excavation. However, soil properties vary depending on the region and excavation depth, and its natural moisture content often does not reach the optimum moisture content. Soil with excessive moisture content can be treated by sun-drying or adding lime, while soil with insufficient moisture content can be treated by on-site watering. However, these methods are difficult to accurately control the moisture content of the subgrade fill soil, are time-consuming and affect the construction schedule, and the treated fill soil is unlikely to reach the optimum moisture content, thus affecting the compaction degree of the embankment subgrade. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention proposes an optimal moisture content control system for roadbed fill, which can improve the accuracy of moisture content control, accelerate processing efficiency, and shorten the corresponding construction time.

[0004] To achieve the above objectives, the present invention provides an optimal moisture content control system for roadbed fill, comprising:

[0005] The experimental module is used to determine the optimum moisture content;

[0006] A silo is used to store soil.

[0007] A moisture content measuring module, connected to the silo, is used to measure the moisture content of the soil in the silo;

[0008] A conveying channel, connected to the silo, is used to transport soil from the silo and change the moisture content of the soil.

[0009] A weighing module, connected to the conveying channel, is used to weigh the soil material in the conveying channel.

[0010] The control module is connected to the experimental module, silo, moisture content measurement module, conveying channel and weighing module respectively, and is used to control the transportation path and moisture content change of the soil according to the moisture content, optimum moisture content and weight of the soil.

[0011] Preferably, the silo includes an inlet silo and an outlet silo;

[0012] The soil inlet bin is used to store soil transported by soil filling trucks;

[0013] The soil unloading silo is used to store soil transported through the conveyor channel.

[0014] Preferably, the silo further includes a mixing unit for mixing the soil material in the silo evenly.

[0015] Preferably, the moisture content determination module includes a moisture content measuring instrument and a time-varying moisture content calibrator;

[0016] The moisture content measuring instrument is used to measure the moisture content of the soil in the soil silo;

[0017] The time-varying moisture content calibrator is used to measure the change in moisture content of soil in the unloading bin.

[0018] Preferably, the moisture content measuring instrument includes a first gripping unit, a drying unit, a first weighing unit, and a first calculation unit;

[0019] The first gripping unit is used to grip the soil material in the soil hopper;

[0020] The drying unit is used to dry the soil material that has been grabbed.

[0021] The first weighing unit is used to weigh the soil material before and after drying;

[0022] The first calculation unit is used to calculate the moisture content of the soil in the soil silo based on the weight of the soil before and after drying.

[0023] Preferably, the time-varying moisture content calibrator includes a second gripping unit, a timing unit, a second weighing unit, and a second calculation unit;

[0024] The second gripping unit is used to grip the soil in the soil unloading bin;

[0025] The timing unit is used to record the air-drying time;

[0026] The second weighing unit weighs the soil before and after air drying;

[0027] The second calculation unit is used to calculate the change in moisture content of the soil in the unloading silo over time based on the weight of the soil before and after air drying.

[0028] Preferably, the conveying channel includes a drying conveying channel and a humidifying conveying channel;

[0029] The drying conveyor channel is used to dry the soil material while it is being transported.

[0030] The humidification conveying channel is used to humidify the soil material during transportation.

[0031] Preferably, the weighing module includes a drying channel weighing unit and a humidification channel weighing unit;

[0032] The weighing unit in the drying channel is used to weigh the soil material in the drying conveyor channel.

[0033] The humidification channel weighing unit is used to weigh the soil material in the humidification conveying channel.

[0034] Preferably, the control module includes a channel control unit and a moisture content control unit;

[0035] The channel control unit is used to control the conveying channel for transporting soil according to the optimal moisture content;

[0036] The moisture content control unit is used to control the degree of drying and humidification.

[0037] Preferably, the moisture content control unit includes a correction subunit, which is used to adjust the degree of drying and humidification according to the change in the moisture content of the soil over time.

[0038] Compared with the prior art, the present invention has the following advantages and technical effects:

[0039] The optimal moisture content control system for roadbed fill described in this invention determines the optimal moisture content of the soil material through experiments and can automatically adjust the moisture content of the soil material according to the optimal moisture content, thereby improving the accuracy of moisture content control, accelerating processing efficiency, and shortening the corresponding construction time. Attached Figure Description

[0040] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings:

[0041] Figure 1 This is a structural diagram of the optimal moisture content control system for roadbed fill according to an embodiment of the present invention;

[0042] The components include: 1. Moisture content measuring instrument; 2. Soil inlet silo; 3. Drying conveyor channel; 4. Humidification conveyor channel; 5. Soil unloading silo; 6. Soil filling transport vehicle; 7. Central control system; 8. Time-varying moisture content calibrator; and 9. Weighing instrument. Detailed Implementation

[0043] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0044] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0045] Example 1

[0046] like Figure 1 As shown, this invention proposes an optimal moisture content control system for roadbed fill, comprising:

[0047] The experimental module is used to determine the optimum moisture content;

[0048] A silo is used to store soil.

[0049] The moisture content measuring module is connected to the silo and is used to measure the moisture content of the soil in the silo.

[0050] The conveyor channel, connected to the silo, is used to transport soil from the silo and change the moisture content of the soil.

[0051] The weighing module is connected to the conveying channel and is used to weigh the soil material in the conveying channel.

[0052] The control module is connected to the experimental module, silo, moisture content measurement module, conveying channel and weighing module respectively, and is used to control the transportation path and moisture content change of the soil according to the moisture content, optimum moisture content and weight of the soil.

[0053] The design was further optimized, and the silos include an inlet silo and an outlet silo.

[0054] The soil silo is used to store soil transported by soil filling trucks;

[0055] The soil unloading bin is used to store soil that has been transported through the conveyor channel.

[0056] In a further optimized design, the silo also includes a mixing unit, which is used to mix the soil material in the silo evenly.

[0057] The scheme has been further optimized, and the moisture content determination module includes a moisture content measuring instrument and a time-varying moisture content calibrator;

[0058] Moisture content measuring instruments are used to measure the moisture content of soil in the soil silo;

[0059] The moisture content time-varying calibrator is used to measure the change in moisture content of soil in the unloading bin.

[0060] The scheme was further optimized, and the moisture content measuring instrument includes a first gripping unit, a drying unit, a first weighing unit, and a first calculation unit;

[0061] The first grabbing unit is used to grab soil from the soil hopper;

[0062] The drying unit is used to dry the soil material being grabbed;

[0063] The first weighing unit is used to weigh the soil before and after drying;

[0064] The first calculation unit is used to calculate the moisture content of the soil in the soil silo based on the weight of the soil before and after drying.

[0065] The scheme was further optimized, and the time-varying moisture content calibrator includes a second grasping unit, a timing unit, a second weighing unit, and a second calculation unit;

[0066] The second grabbing unit is used to grab soil from the soil unloading bin;

[0067] The timing unit is used to record the drying time;

[0068] The second weighing unit weighs the soil before and after air drying;

[0069] The second calculation unit is used to calculate the change in moisture content of the soil in the unloaded soil bin over time based on the weight of the soil before and after air drying.

[0070] The scheme has been further optimized, with the conveying channels including a drying conveying channel and a humidification conveying channel;

[0071] The drying conveyor channel is used to dry the soil material while it is being transported.

[0072] The humidification conveyor channel is used to humidify the soil material during transportation.

[0073] The scheme has been further optimized, and the weighing module includes a weighing unit for the drying channel and a weighing unit for the humidification channel;

[0074] The weighing unit in the drying channel is used to weigh the soil material in the drying conveyor channel;

[0075] The humidification channel weighing unit is used to weigh the soil material in the humidification conveying channel.

[0076] The scheme was further optimized, and the control module includes a channel control unit and a moisture content control unit;

[0077] The channel control unit is used to control the conveyor channel for transporting soil according to the optimal moisture content;

[0078] The moisture content control unit is used to control the degree of drying and humidification.

[0079] Further optimization of the scheme includes a moisture content control unit that includes a correction subunit. The correction subunit is used to adjust the degree of drying and humidification based on the change in soil moisture content over time.

[0080] Example 2

[0081] The specific operation of the optimal moisture content control system for roadbed fill is as follows:

[0082] 1. A compaction test was conducted on the soil retrieved from the sampling site in the laboratory to obtain the optimal moisture content ω0 at which the soil can reach its maximum dry density.

[0083] 2. Figure 1 The system equipment shown is towed to the roadbed filling site, and the optimal moisture content ω0 of the test is input into the main control system 7 as the target moisture content of the soil.

[0084] 3. After the soil transport vehicle 6 transports the soil from the land acquisition site to the roadbed filling site, it unloads the soil into the soil inlet bin 2. The volume of the soil inlet bin 2 is sufficient to meet the carrying capacity of one dump truck.

[0085] 4. Since the excavation depth varies at different land acquisition sites, the moisture content of the soil in different parts of each truck may vary. Therefore, the soil inlet hopper 2 has a mixing function. After the soil transport truck 6 unloads the soil into the soil inlet hopper 2, the soil inlet hopper 2 first activates the mixing function to mix the soil evenly.

[0086] 5. For the soil after it has been mixed evenly, the moisture content measuring instrument 1 can automatically grab a small amount of soil from the soil inlet hopper 2 and quickly measure the soil moisture content ω1.

[0087] 6. The working principle of the moisture content measuring instrument 1 is mainly to integrate drying and weighing functions, and it can automatically obtain the moisture content ω1 of the soil to be tested. Its principle is to work with the central control system 7. After the soil is put in, the initial mass m1 of the soil is weighed and sent to the central control system 7. Then, the moisture content measuring instrument 1 starts the drying function. After the weighing measurement value no longer changes, the drying is automatically stopped, and the mass m2 of the soil at this time is measured and sent to the central control system 7. Then, the moisture content ω1 of the soil to be tested is calculated by the central control system 7.

[0088]

[0089] 7. The weighing function of the moisture content measuring instrument 1 has high sensitivity, capable of measuring minute weight changes. Therefore, it can be used to measure the moisture content of soil samples with relatively small masses, thereby reducing drying time and improving system operating efficiency. Furthermore, due to the small mass of soil sampled, high measurement accuracy is required. To prevent errors from significantly affecting the moisture content measurement, the moisture content measuring instrument 1 has a physical crushing function, which can be used in conjunction with a low-temperature, high-speed airflow method for drying. This avoids the decomposition of organic matter in the soil caused by high-temperature drying, which could lead to significant errors in the moisture content measurement.

[0090] 8. After measuring ω1, the main control system 7 compares ω0 with ω1. If ω1 > ω0, it means that the moisture content of the on-site construction soil is greater than the optimum moisture content, and the moisture content of the backfill soil at the construction site needs to be reduced; if ω1 < ω0, it means that the moisture content of the on-site construction soil is less than the optimum moisture content, and the moisture content of the backfill soil at the construction site needs to be increased.

[0091] 9. When ω1>ω0, the door at the junction of the drying conveyor channel 3 and the soil inlet hopper 2 is opened, while the door at the junction of the humidifying conveyor channel 4 and the soil inlet hopper 2 is closed, so that the soil in the soil inlet hopper 2 enters the drying conveyor channel 3 for drying, thereby reducing the moisture content of the soil.

[0092] 10. The drying conveyor channel 3 has a certain conveying length and maintains a certain drying temperature. However, the conveying speed is controlled and adjusted by the central control system 7 to indirectly control the drying time of the soil, thereby controlling the change in moisture content after drying. Before starting large-scale drying, the conveying speed needs to be calibrated.

[0093] 11. The calibration method for the conveying speed of the drying conveyor channel 3 is as follows: A weighing instrument 9 is located at the end of the drying conveyor channel 3, at the point where it enters the unloading hopper 5. The weighing instrument 9 can weigh the mass of the soil within the L1-length conveyor channel. Since the cross-section of the drying conveyor channel 3 is fixed, the amount of soil entering the drying conveyor channel 3 per unit conveying length from the inlet hopper 2 is a constant. At the beginning of calibration, the drying device switch is not turned on. After the calibrated soil sample passes through the drying conveyor channel 3, the conveyor belt of the drying conveyor channel 3 is turned off. The calibrated mass of the soil sample on the L1-length conveyor channel is determined to be b0, and the data is transmitted to the central control system 7. At this time, the soil moisture content is ω1.

[0094] Then turn on the drying device. When the temperature reaches the drying temperature, restart the conveyor belt of drying conveyor channel 3, and set the conveying speed of drying conveyor channel 3 to v1 on the main control system 7. Given that the total length of the conveyor belt of drying conveyor channel 3 is L0, then when time... At this time, the weighing instrument 9 weighs the soil again to obtain the mass b1, and transmits the data to the central control system 7. Then, the moisture content ω of the dried soil at this time is... b，1 This can be calculated by the central control system 7:

[0095]

[0096] When a set of data (v) is measured x ,ω b，x Afterwards, the central control system 7 can use a high-order polynomial to fit the function of the conveyor belt speed of the drying transmission channel 3 with respect to the moisture content of the dried soil (it is necessary to ensure that the minimum moisture content of the measured data is less than the optimum moisture content, and the maximum moisture content is greater than the optimum moisture content):

[0097] ω b=f(v)

[0098] Based on the input ω0 value, the main control system 7 can then determine the value based on ω. b =f(v) determines the speed v of the conveyor belt in drying conveyor channel 3.

[0099] 12. When ω1 < ω0, the door at the junction of the humidifying conveyor channel 4 and the soil inlet hopper 2 is open, while the door at the junction of the drying conveyor channel 3 and the soil inlet hopper 2 is closed, allowing soil from the soil inlet hopper 2 to enter the humidifying conveyor channel 4. The conveyor belt speed in the humidifying conveyor channel 4 is constant, v. s .

[0100] 13. The humidification conveying channel 4 is equipped with a spraying device. The central control system 7 can control the amount of water sprayed per unit time by the spraying device in the humidification conveying channel 4 to control the change in soil moisture content after humidification.

[0101] First, the water spray device in the humidification conveyor channel 4 is turned off. After a certain amount of soil is conveyed, the mass of the soil on the L2-length conveyor belt is measured by the weighing instrument 9 as c0 and transmitted to the central control system 7. At this time, the water content of the soil is ω1. Then, the central control system 7 can calculate the mass of soil conveyed per unit time, c1, as follows:

[0102]

[0103] Furthermore, the central control system 7 can calculate the water spray volume per unit time of the water spray device in the humidification conveying channel 4 as follows:

[0104]

[0105] 14. Regarding the target moisture content ω0 that has been input into the main control system 7, considering that there is still a certain construction time between the soil being unloaded from the unloading hopper 5 and the start of compaction, the natural air drying caused by the soil contacting the air will affect the soil moisture content. Therefore, it is necessary to correct the soil moisture content.

[0106] 15. The time-varying moisture content calibrator 8 can automatically grab a certain amount of soil from the unloading hopper 5. The top surface of the time-varying moisture content calibrator 8 is open, allowing the soil to naturally contact the air. Its function is to determine the change of soil moisture content over time under natural air-drying conditions in the construction site environment. The working principle of the time-varying moisture content calibrator 8 is to use a high-sensitivity weighing function, in conjunction with a timer, to measure the mass of soil at different times and send it to the central control system 7, thereby obtaining the law of change of soil moisture content over time.

[0107] 16. The specific implementation method of the time-varying moisture content calibrator 8 is as follows: After grabbing a certain amount of soil, the mass a0 of the soil at the initial time t0 is immediately measured and transmitted to the central control system 7. Then, the central control system 7 can calculate the dry weight of the soil grabbed by the time-varying moisture content calibrator 8 as follows:

[0108]

[0109] Subsequently, a time-varying moisture content calibrator 8 was used to measure the soil mass change in real time for a given t. i The mass of soil measured at time a i Then the change in moisture content at this time is:

[0110]

[0111] The continuous measurement time of the moisture content time-varying calibrator 8 should be greater than the total time of the roadbed filling, leveling, and compaction processes at the construction site. This should be achieved after continuously measuring a set of (t) j a j After the data is transmitted to the central control system 7, the central control system 7 can use a high-order polynomial to fit the function of the change in water content Δω of the soil at the construction site in contact with air as a function of time t:

[0112] Δω=f(t)

[0113] Input the total time t from the soil unloading bin 5 to the time before compaction in the main control system 7. a Then the main control system 7 can determine the target moisture content ω of the soil used for on-site construction based on Δω=f(t). a for:

[0114] ω a =ω0+Δω

[0115] 17. The main control system 7 sets ω0 = ω a According to steps 8 to 13, the conveyor belt speed v of the drying conveyor channel 3 or the water spraying volume Q per unit time of the spraying device of the humidifying conveyor channel 4 can be determined, thereby controlling the operation of the entire system so that the moisture content of the roadbed fill reaches the laboratory optimum moisture content ω0 before compaction, thus ensuring the compaction degree of the roadbed fill.

[0116] 18. The soil unloading hopper 5 has a mixing function, which can mix the soil that has passed through the drying conveyor channel 3 or the humidifying conveyor channel 4 evenly before unloading. Finally, the soil that has reached the target moisture content is unloaded from the soil unloading hopper 5 to the construction location of the embankment.

[0117] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An embankment fill optimum moisture content control system, characterized by, The system comprises: an experiment module for determining the optimum moisture content; a bin for storing soil; a moisture content determination module connected to the bin for measuring the moisture content of the soil in the bin; the moisture content determination module comprises a moisture content determination instrument and a moisture content time-varying calibration instrument; the moisture content determination instrument is used to measure the moisture content of the soil in the soil inlet bin; the moisture content time-varying calibration instrument is used to measure the moisture content change of the soil in the soil outlet bin; the moisture content determination instrument comprises a first grabbing unit, a drying unit, a first weighing unit and a first calculation unit; the first grabbing unit is used to grab the soil in the soil inlet bin; the drying unit is used to dry the grabbed soil; the first weighing unit is used to weigh the soil before and after drying; the first calculation unit is used to calculate the moisture content of the soil in the soil inlet bin according to the weight of the soil before and after drying; the moisture content time-varying calibration instrument comprises a second grabbing unit, a timing unit, a second weighing unit and a second calculation unit; the second grabbing unit is used to grab the soil in the soil outlet bin; the timing unit is used to record the air-drying time; the second weighing unit weighs the soil before and after air-drying; the second calculation unit is used to calculate the moisture content change of the soil in the soil outlet bin according to the weight of the soil before and after air-drying; a conveying channel connected to the bin for transporting the soil in the bin and changing the moisture content of the soil; the conveying channel comprises a drying conveying channel and a humidifying conveying channel; the drying conveying channel is used to dry the soil while transporting; the humidifying conveying channel is used to humidify the soil while transporting; a weighing module connected to the conveying channel for weighing the weight of the soil in the conveying channel; a control module connected to the experiment module, the bin, the moisture content determination module, the conveying channel and the weighing module respectively for controlling the transportation path and the moisture content change of the soil according to the moisture content, the optimum moisture content and the weight of the soil.

2. The optimum moisture content control system for roadbed filling soil according to claim 1, wherein: the bin comprises a soil inlet bin and a soil outlet bin; the soil inlet bin is used to store the soil transported by the filling soil transportation vehicle; the soil outlet bin is used to store the soil transported by the conveying channel.

3. The optimum moisture content control system for roadbed filling soil according to claim 2, wherein: the bin further comprises a stirring unit for stirring the soil in the bin uniformly.

4. The optimum moisture content control system for roadbed filling soil according to claim 1, wherein: the weighing module comprises a drying channel weighing unit and a humidifying channel weighing unit; the drying channel weighing unit is used to weigh the weight of the soil in the drying conveying channel; the humidifying channel weighing unit is used to weigh the weight of the soil in the humidifying conveying channel.

5. The optimum moisture content control system for roadbed filling soil according to claim 1, wherein: the control module comprises a channel control unit and a moisture content control unit; the channel control unit is used to control the conveying channel for transporting the soil according to the optimum moisture content; the moisture content control unit is used to control the drying and humidifying degree.

6. The embankment fill optimum moisture content control system of claim 5, wherein, The moisture content control unit includes a correction subunit for adjusting the drying and humidifying degree in accordance with the amount of change in moisture content of the earth material over time.

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