Intelligent control alternate pressurization vacuum preloading dredger fill consolidation test device and method

Abstract

The invention relates to the technical field of civil engineering intelligent construction test equipment, and particularly discloses an intelligent control alternative pressurization vacuum preloading dredger fill consolidation test device, which comprises a data acquisition model box and a vacuumizing-pressurization type control system, the data acquisition model box comprises a box body, a box cover, a pore water pressure gauge, a pore gas pressure gauge, a vacuum degree measurer, a drainage plate, geotechnical cloth and a sand cushion layer, and the vacuumizing-pressurizing type control system comprises a computer, an air compressor, an electric three-way valve, a steam-water separator, a vacuum pump and a data acquisition instrument. The air compressor, the vacuum pump and the electric three-way valve are connected to a computer through signal lines. The invention further provides an intelligent control alternate pressurization vacuum preloading dredger fill consolidation test method. According to the invention, the consolidation time of the dredger fill foundation can be shortened, the project progress can be accelerated, various different vacuum preloading tests can be carried out on different soil samples, the operation is convenient, the manufacturing is easy, the measurement is fine, and the practicability is strong.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering intelligent construction test equipment, and specifically provides an intelligent control alternating pressurization vacuum preloading dredger fill consolidation test device and method. Background Art

[0002] With the rapid development of my country's economy and the increasing population in coastal areas, my country's coastal areas are implementing planned land reclamation, island construction and road construction projects. The land reclamation projects mainly use blown fill soil, which has a complex composition and mainly presents the characteristics of "three highs and two lows", namely high water content, high porosity, high compressibility and low strength, and low bearing capacity.

[0003] At present, vacuum preloading is mainly used for the treatment and reinforcement of dredger fill, which has achieved good results. However, due to the high clay content of dredger fill, it is easy to form a clogging layer around the drainage board, affecting the drainage effect. In order to improve the vacuum preloading method, after consulting, scholars have carried out indoor test research on alternating vacuum preloading method and boosting vacuum preloading method, and the reinforcement effect is better than the traditional vacuum preloading method, but there has been no test research on the reinforcement of soft soil foundation by alternating boosting vacuum preloading method, nor has such test equipment or corresponding literature been found.

[0004] Therefore, in order to reduce the consolidation time of the fill foundation and improve engineering efficiency, how to design an intelligent controlled alternating pressurization vacuum preloading consolidation test device and method suitable for fill foundation is a problem that needs to be solved urgently. Summary of the invention

[0005] In order to solve the above problems, the present invention provides an intelligent controlled alternating pressurization vacuum preloading consolidation test device and method suitable for dredged fill, which is particularly suitable for studying the reinforcement mechanism of dredged fill foundation, and will be beneficial to shortening the consolidation time of dredged fill foundation, speeding up the project progress and saving the test cost.

[0006] The present invention provides an intelligent control alternating pressurization vacuum preloading dredger fill consolidation test device, comprising a data acquisition model box and a vacuum-boosting control system;

[0007] The data acquisition model box includes a box body and a box cover. The box body is filled with blown fill soil. A drainage board and a plurality of measuring devices are buried in the blown fill soil. An isolation cushion layer is also provided in the box body above the drainage board and the measuring devices. The drainage board includes a drainage board 1 and a drainage board 2 vertically arranged with the isolation cushion layer. The plurality of measuring devices are located between the drainage board 1 and the drainage board 2.

[0008] The vacuum-boosting control system includes a computer, an air compressor, an electric three-way valve connected to the air compressor through a connecting pipe 1, a steam-water separator connected to the electric three-way valve through a connecting pipe 2, and a vacuum pump connected to the steam-water separator through a connecting pipe 3;

[0009] The electric three-way valve includes an electric three-way valve one and an electric three-way valve two. The connecting pipe one includes a shunt pipe one connected to the electric three-way valve one and a shunt pipe two connected to the electric three-way valve two. The connecting pipe two includes a shunt pipe three connected to the electric three-way valve one and a shunt pipe four connected to the electric three-way valve two. The drainage board one is connected to the electric three-way valve one through the connecting pipe five, and the drainage board two is connected to the electric three-way valve two through the connecting pipe six.

[0010] The air compressor, the vacuum pump, and the electric three-way valve are all connected to the computer through signal lines. A plurality of measuring devices are connected to a data acquisition instrument through signal lines passing through the isolation cushion layer, and the data acquisition instrument is connected to the computer.

[0011] Further, the isolation cushion layer includes two layers of geotextiles and a sand cushion layer located between the two layers of geotextiles. A plurality of holes are provided on the two layers of geotextiles for the signal lines of the measuring devices, the connecting pipe five, and the connecting pipe six to pass through. The two layers of geotextiles are respectively an upper geotextile and a lower geotextile, and a sealing film is provided on the upper geotextile.

[0012] Further, the connecting pipe one further includes a main pipe one and a valve one located on the main pipe one. The shunt pipe one and the shunt pipe two are branched from one end of the main pipe one away from the air compressor. The connecting pipe two includes a main pipe two and a valve two located on the main pipe two. The shunt pipe three and the shunt pipe four are branched from one end of the main pipe two away from the steam-water separator. A valve three close to the steam-water separator and a valve four close to the vacuum pump are respectively provided on the connecting pipe three.

[0013] Further, the plurality of measuring devices include three groups of total measuring device groups arranged uniformly in the transverse direction between the drainage board one and the drainage board two. Each group of total measuring device groups respectively includes three groups of sub-measuring device groups arranged uniformly in the vertical direction. Each group of sub-measuring device groups respectively includes a pore water pressure gauge, a pore air pressure gauge, and a vacuum degree measuring device buried in the dredger fill.

[0014] Further, let the transverse distance between the drainage board one and the drainage board two be L. The three groups of total measuring device groups are respectively located at 1 / 4L, 1 / 2L, and 3 / 4L. Let the height of the drainage board one and the drainage board two be H. The uppermost sub-measuring device group in the three groups of total measuring device groups is located at 1 / 4H, the middle sub-measuring device group is located at 1 / 2H, and the lowermost sub-measuring device group is located at 3 / 4H.

[0015] Further, both the box body and the box cover are made of acrylic material. A rubber cushion layer is provided on the circumference of the box cover, and the box cover and the box body form a piston structure. The thickness of the box cover is 5 - 10 cm, and scales are provided on the outer wall of the box body. An air discharge pipeline is provided on the box cover, and a valve five is connected to the air discharge pipeline. The connecting pipe five, the connecting pipe six, and the signal lines of the measuring devices all pass through the box cover.

[0016] Furthermore, the steam-water separator is made of acrylic material and is marked with scales; an electronic vacuum gauge is provided on the top of the steam-water separator and an electronic balance is provided on the bottom, and the electronic balance is connected to a computer; the air compressor and the vacuum pump are both graded and adjusted by a computer, the gear of the air compressor is 0-200kPa, and the gear of the vacuum pump is 0-100kPa.

[0017] Furthermore, when the alternating boost vacuum preloading method test is conducted, valve 1, valve 2, valve 3, valve 4 and valve 5 are all in an open state, and the electric three-way valve 1 and the electric three-way valve 2 are in different connection states. During the test, the electric three-way valve 1 and the electric three-way valve 2 are switched in a timely manner according to demand;

[0018] When the alternating vacuum preloading method is performed, the valve 1 connected to the air compressor is in a closed state, and the electric three-way valve 1 and the electric three-way valve 2 are in different connection states;

[0019] When the booster vacuum preloading method is used, valves 1, 2, 3, 4 and 5 are all in the open state, and the electric three-way valve 1 and the electric three-way valve 2 are in different connection states. During the test, the electric three-way valve 1 and the electric three-way valve 2 do not need to be switched;

[0020] When the conventional vacuum preloading method and the graded vacuum preloading method are performed, the valve 1 connected to the air compressor is in a closed state. During the test, the electric three-way valve 1 and the electric three-way valve 2 do not need to be switched. The connection state of the electric three-way valve 1 and the electric three-way valve 2 is determined based on whether the single-plate vacuum preloading or the double-plate vacuum preloading is performed.

[0021] An intelligent control alternating pressurization vacuum preloading dredger fill consolidation test method, using the above test device to conduct the test, includes the following steps:

[0022] S1. Check the air tightness of the box and piping system: before the test, close valve 1 connected to the air compressor and turn on the vacuum pump; close valve 4 connected to the vacuum pump and turn off the vacuum pump simultaneously, collect data from the electronic vacuum meter on the vapor-liquid separator, and if the negative pressure environment can be maintained unchanged, it is considered to be airtight;

[0023] S2. Loading the dredger fill and burying the measuring device: measuring the moisture content of the obtained dredger fill, loading the obtained dredger fill into the box, and burying the drain board 1, drain board 2, pore water pressure gauge, pore air pressure gauge and vacuum sensor into the dredger fill, measuring the initial moisture content of the dredger fill, turning on the data acquisition instrument and computer, checking whether the pore water pressure gauge, pore air pressure gauge 10 and vacuum sensor can work normally, and setting up the DIC high-speed photography device to prepare for the test;

[0024] S3. Test setting: Turn on the electronic balance, electric three-way valve 1, electric three-way valve 2, air compressor, vacuum pump, and set the test plan through the computer;

[0025] S4. Test process: Conduct the test according to the test plan set in the computer;

[0026] S5: End of the test: Stop the test according to the set conditions, turn off the instrument, open valve 5 above the box cover, take out the dredged fill soil sample in the box and measure the moisture content, export the test data in the computer and analyze it.

[0027] Furthermore, the computer controls the electric three-way valve 1, the electric three-way valve 2, the air compressor and the vacuum pump in two ways: the computer controls according to the set conversion time period, and the computer controls according to the collected data to determine whether the control value is reached;

[0028] The test scheme in step S3 includes two modes. One mode is to set the alternating pressurization cycle mode of drain board 1 and drain board 2 through a time period, and the time period of the periodic adjustment mode is 1h-7d; the other mode is to perform feedback adjustment based on the data collected during the test. The feedback adjustment mode requires determining the appropriate feedback adjustment threshold through experiments.

[0029] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0030] 1. The present invention provides an intelligent control alternating pressurization vacuum preloading blown fill soil consolidation test device which is easy to operate, easy to make, has fine measurement and strong practicality. A variety of different vacuum preloading tests can be carried out on different soil samples, especially for indoor exploratory tests of alternating pressurization vacuum preloading. During the vacuum preloading consolidation process of the soil sample, the pore water pressure, pore gas pressure, vacuum degree and other parameters can be measured and recorded in real time, so as to quantitatively analyze the consolidation process. The vacuum pump, air compressor and two electric three-way valves can be controlled according to the collected data such as pore water pressure, pore gas pressure and vacuum degree.

[0031] 2. The present invention can test conventional vacuum preloading method, graded vacuum preloading method, alternating vacuum preloading method, boosted vacuum preloading method and alternating boosted vacuum preloading method, and can cooperate with the DIC high-speed measurement system to measure soil displacement, for further research on the vacuum preloading method.

[0032] 3. The present invention can set the test content before the test begins, automatically record the test data during the test, and automatically adjust the air compressor, vacuum pump and electric three-way valve according to the set cycle, thereby reducing manpower costs during the test and reducing errors caused by manual operation.

[0033] 4. The present invention can determine the adjustment conditions of the air compressor, vacuum pump and electric three-way valve based on the preliminary test data, and set the automatic adjustment conditions based on the data collected during the test to achieve intelligent control. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a schematic diagram of the overall structure of a test device provided according to an embodiment of the present invention;

[0035] Figure 2 It is a schematic diagram of the structure of the drain board 1, the drain board 2 and the measuring device in the test device provided according to an embodiment of the present invention;

[0036] Figure 3 is a schematic structural diagram of a total measuring device group in a test device provided in an embodiment of the present invention;

[0037] Figure 4 is a schematic diagram of the structure of a group of sub-measurement devices in a test device provided in an embodiment of the present invention;

[0038] Figure 5 It is a test flow chart provided according to an embodiment of the present invention.

[0039] The accompanying drawings include: air compressor 1, valve 1, main pipeline 2, box cover 4, geotextile 5, sand cushion 6, box body 7, drain board 8, pore water pressure gauge 9, pore air pressure gauge 10, vacuum measuring device 11, data acquisition instrument 12, electric three-way valve 1 13, electric three-way valve 2 14, electronic pressure gauge 15, steam-water separator 16, electronic balance 17, computer 18, vacuum pump 19, valve 2 20, valve 3 21, valve 4 22, valve 5 23, drain board 1 24, drain board 2 25, diverter pipeline 1 26, diverter pipeline 2 27, diverter pipeline 3 28, diverter pipeline 4 29, connecting pipeline 5 30, connecting pipeline 6 31, venting pipeline 32, main pipeline 1 33, connecting pipeline 3 34. DETAILED DESCRIPTION

[0040] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the following Figure 1-5 It should be understood that the specific embodiments described herein are only used to explain the present invention and do not constitute a limitation of the present invention.

[0041] An intelligent control alternating pressurization vacuum preloading dredger fill consolidation test device includes a data acquisition model box and a vacuum-boosting control system. Figure 1As shown, the data acquisition model box includes a box body 7 and a box cover 4. The box body 7 is filled with blown fill soil. A scale is provided on the outer wall of the box body 7 to facilitate observation of soil settlement. A drain board 8 and a plurality of measuring devices are buried in the blown fill soil. The box body 7 is also provided with an isolation cushion layer located above the drain board 8 and the measuring devices. The drain board 8 includes a drain board 1 24 and a drain board 25 vertically arranged with the isolation cushion layer. A plurality of measuring devices are located between the drain board 1 24 and the drain board 25. The specifications of the drain board 1 24 and the drain board 25 are half of the normal drainage board body. The drain board 1 24 and the drain board 25 are in contact with the box wall of the box body 7.

[0042] The box body 7 and the box cover 4 are both made of acrylic material, which allows direct observation of the internal situation of the box body 7. It is also convenient to use the DIC high-speed measurement system in conjunction with the test device to analyze the displacement of the soil during the test when conducting an axisymmetric test. The box cover 4 is provided with a rubber cushion layer in the circumference and reinforced with AB glue, glass glue, etc. The box cover 4 and the box body 7 form a piston structure. While ensuring the internal seal during the test, the box cover 4 can move with the settlement of the soil. The thickness of the box cover 4 is 5-10 cm to avoid air leakage caused by the tilt of the box cover. A handle is provided on the box cover 4 for easy installation.

[0043] The isolation cushion layer includes two layers of geotextile 5 and a sand cushion layer 6 located between the two layers of geotextile 5. The thickness of the sand cushion layer 6 is 5 cm. The size of the geotextile 5 is consistent with the internal size of the box 7. The two layers of geotextile 5 are an upper geotextile 5 and a lower geotextile 5. The lower geotextile is used to separate the sand cushion layer 6 from the blown fill soil. A sealing film is provided on the upper geotextile 5 to ensure the internal pressure of the soil.

[0044] like Figure 1-Figure 4 As shown, the multiple measuring instruments include three groups of total measuring instrument groups uniformly arranged between the drain board 1 24 and the drain board 25 in the horizontal direction, and each group of total measuring instrument groups includes three groups of sub-measuring instrument groups uniformly arranged in the vertical direction. Figure 3 As shown, the sub-meter group is as follows Figure 4 As shown, each group of sub-metering devices includes a pore water pressure gauge 9, a pore air pressure gauge 10 and a vacuum degree measuring device 11 which are buried in the dredger fill.

[0045] Assume that the lateral distance between the drain board 1 24 and the drain board 2 25 is L, the three total measuring instrument groups are located at 1 / 4L, 1 / 2L, and 3 / 4L respectively, and the height of the drain board 1 24 and the drain board 2 25 is H. The uppermost sub-measuring instrument group of the three total measuring instrument groups is located at 1 / 4H, the middle sub-measuring instrument group is located at 1 / 2H, and the lowermost sub-measuring instrument group is located at 3 / 4H. Figure 2 The entire height of drain board 1 24 and drain board 2 25 is not shown, and the uppermost parts of drain board 1 24 and drain board 2 25 are not shown.

[0046] The vacuum-boosting control system includes a computer 18, an air compressor 1, an electric three-way valve connected to the air compressor 1 through a connecting pipe 1, a steam-water separator 16 connected to the electric three-way valve through a connecting pipe 2, and a vacuum pump 19 connected to the steam-water separator 16 through a connecting pipe 3 34. The electric three-way valve includes an electric three-way valve 13 and an electric three-way valve 2 14. The connecting pipe 1 includes a shunt pipe 1 26 connected to the electric three-way valve 1 13 and a shunt pipe 2 27 connected to the electric three-way valve 2 14. The connecting pipe 2 includes a shunt pipe 3 28 connected to the electric three-way valve 1 13 and a shunt pipe 4 29 connected to the electric three-way valve 2 14. The drain plate 1 24 is connected to the electric three-way valve 1 13 through a connecting pipe 5 30. The drain plate 2 25 is connected to the electric three-way valve 2 14 through a connecting pipe 6 31, so as to facilitate negative pressure drainage and positive pressure inflation.

[0047] The connecting pipeline one also includes a main pipeline one 33 and a valve one 2 located on the main pipeline one 33, and the branch pipeline one 26 and the branch pipeline two 27 are formed by branching from the end of the main pipeline one 33 away from the air compressor 1; the connecting pipeline two includes a main pipeline two 3 and a valve two 20 located on the main pipeline two 3, and the branch pipeline three 28 and the branch pipeline four 29 are formed by branching from the end of the main pipeline two 3 away from the steam-water separator 16; the connecting pipeline three 34 is respectively provided with a valve three 21 close to the steam-water separator 16 and a valve four 22 close to the vacuum pump 19, the box cover 4 is provided with a venting pipeline 32 and the venting pipeline 32 is connected to the valve five 23, and the connecting pipeline five 30, the connecting pipeline six 31, and the signal line of the measuring device all pass through the box cover 4.

[0048] The air compressor 1, the vacuum pump 19, and the electric three-way valve are all connected to the computer 18 through signal lines. Multiple measuring instruments pass through the isolation cushion layer through signal lines and are connected to the data acquisition instrument 12. The data acquisition instrument 12 is connected to the computer 18. The two layers of geotextiles 5 are provided with multiple holes for the signal lines of the measuring instruments, the connecting pipes 5 30, and the connecting pipes 6 31 to pass through. The two layers of geotextiles 5 are provided with multiple holes for the signal lines of the measuring instruments, the connecting pipes 5 30, and the connecting pipes 6 31 to pass through. The data acquisition instrument 12 can collect data such as pore water pressure, pore gas pressure, and vacuum degree and input them into the computer 18. According to the collected data, the electric three-way valve, the air compressor 1, and the vacuum pump 19 can be adjusted respectively. The electric three-way valve is converted through the software control in the computer 18. The two channels are drainage board 8-vacuum pump 19 and drainage board 8-air compressor 1.

[0049] The steam-water separator 16 is made of acrylic material and is marked with scales, so the amount of water in the steam-water separator 16 can be directly measured. An electronic vacuum gauge is provided on the top of the steam-water separator 16 and a precision electronic balance 17 is provided on the bottom. The electronic balance 17 is connected to a computer 18, so the collected data can be directly input and stored in the computer 18, and the electric three-way valve, air compressor 1 and vacuum pump 19 are adjusted and the test is stopped based on the collected data. The air compressor 1 and the vacuum pump 19 are both graded and adjusted by the computer 18, and the gear of the air compressor 1 is 0-200kPa, and the gear of the vacuum pump 19 is 0-100kPa.

[0050] When conducting the alternating boost vacuum preloading method test, valve one 2, valve two 20, valve three 21, valve four 22 and valve five 23 are all in the open state, and the electric three-way valve one 13 and the electric three-way valve two 14 are in different connection states. During the test, the electric three-way valve one 13 and the electric three-way valve two 14 are switched in time according to demand.

[0051] When the alternating vacuum preloading method is performed, the valve 1 2 connected to the air compressor 1 is in a closed state, and the electric three-way valve 1 13 and the electric three-way valve 2 14 are in different connection states.

[0052] When the boost vacuum preloading method is performed, valve one 2, valve two 20, valve three 21, valve four 22 and valve five 23 are all in the open state, and the electric three-way valve one 13 and the electric three-way valve two 14 are in different connection states. During the test, the electric three-way valve one 13 and the electric three-way valve two 14 do not need to be switched.

[0053] When the conventional vacuum preloading method and the graded vacuum preloading method are performed, the valve 1 2 connected to the air compressor 1 is in a closed state. During the test, the electric three-way valve 1 13 and the electric three-way valve 2 14 do not need to be switched. The connection state of the electric three-way valve 1 13 and the electric three-way valve 2 14 is determined according to whether single-plate vacuum preloading or double-plate vacuum preloading is performed.

[0054] An intelligent control alternating pressurization vacuum preloading dredger fill consolidation test method is used to conduct the test using the above test device, such as Figure 5 As shown, the following steps are included:

[0055] S1. Check the air tightness of the box 7 and the pipeline system: before preparing for the test, close the valve 2 connected to the air compressor 1, turn on the vacuum pump 19, and make the pipeline reach a negative pressure environment; close the valve 22 connected to the vacuum pump 19 and turn off the vacuum pump 19 simultaneously, collect data from the electronic vacuum meter on the vapor-liquid separator, and make sure that it can maintain the negative pressure environment unchanged, which is considered to be good air tightness;

[0056] S2. Loading the dredger fill and burying the measuring device: measuring the moisture content of the obtained dredger fill, loading the obtained dredger fill into the box 7, and burying the drain board 1 24, the drain board 25, the pore water pressure gauge 9, the pore air pressure gauge 10 and the vacuum sensor in the dredger fill, measuring the initial moisture content of the dredger fill, turning on the data acquisition instrument 12 and the computer 18, checking whether the pore water pressure gauge 9, the pore air pressure gauge 10 and the vacuum sensor can work normally, and setting up the DIC high-speed photography device to prepare for the test;

[0057] S3, test setting: turn on the electronic balance 17, the electric three-way valve 1 13, the electric three-way valve 2 14, the air compressor 1, and the vacuum pump 19, and set the test plan through the computer 18. The computer 18 controls the electric three-way valve 1 13, the electric three-way valve 2 14, the air compressor 1 and the vacuum pump 19 in two ways: the computer 18 controls according to the set conversion time period, and the computer 18 controls according to the collected data to determine whether the control value is reached;

[0058] The test scheme in step S3 includes two modes. One mode is to set the alternating pressurization cycle mode of drain board 1 24 and drain board 2 25 through a time period. The time period of the periodic adjustment mode is 1h-7d. The other mode is to perform feedback adjustment based on the data collected during the test. The feedback adjustment mode requires determining the appropriate feedback adjustment threshold through experiments. For example, it can be judged based on the changes in the drainage rate, pore water pressure, pore gas pressure, vacuum degree and other data collected during the test.

[0059] S4. Test process: The test is conducted according to the test plan set in the computer 18. For example, the test plan can be set such that the daily water discharge is less than 0.1 kg.

[0060] S5: End of test: Stop the test according to the set conditions, turn off the instrument, open the valve 5 23 above the box cover 4, take out the dredged fill soil sample in the box 7 and measure the moisture content, export the test data in the computer 18 and analyze the test data in combination with the soil displacement observed by the DIC high-speed measurement system.

[0061] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. An intelligent control alternating pressurization vacuum preloading dredger fill consolidation test device, characterized in that: It includes a data acquisition model box and a vacuum-boosting control system; The data acquisition model box includes a box body and a box cover, the box body is filled with blown fill soil, a drainage board and a plurality of measuring devices are buried in the blown fill soil, an isolation cushion layer is also provided in the box body above the drainage board and the measuring devices, the drainage board includes a drainage board 1 and a drainage board 2 vertically arranged with the isolation cushion layer, and the plurality of measuring devices are located between the drainage board 1 and the drainage board 2; The vacuum-boosting control system comprises a computer, an air compressor, an electric three-way valve connected to the air compressor via a connecting pipe 1, a steam-water separator connected to the electric three-way valve via a connecting pipe 2, and a vacuum pump connected to the steam-water separator via a connecting pipe 3; The electric three-way valve includes an electric three-way valve 1 and an electric three-way valve 2, the connecting pipe 1 includes a shunt pipe 1 connected to the electric three-way valve 1 and a shunt pipe 2 connected to the electric three-way valve 2, the connecting pipe 2 includes a shunt pipe 3 connected to the electric three-way valve 1 and a shunt pipe 4 connected to the electric three-way valve 2; the drain plate 1 is connected to the electric three-way valve 1 through the connecting pipe 5, and the drain plate 2 is connected to the electric three-way valve 2 through the connecting pipe 6; The air compressor, vacuum pump, and electric three-way valve are all connected to the computer via signal lines; multiple measuring instruments pass through the isolation cushion layer via signal lines and are connected to a data acquisition instrument, which is connected to the computer.

2. The intelligent control alternating pressurization vacuum preloading dredger fill consolidation test device according to claim 1 is characterized in that: The isolation cushion layer includes two layers of geotextiles and a sand cushion layer located between the two layers of geotextiles. The two layers of geotextiles are provided with a plurality of holes for the signal line of the measuring device, the connecting pipe five and the connecting pipe six to pass through. The two layers of geotextiles are respectively an upper geotextile and a lower geotextile, and a sealing film is provided on the upper geotextile.

3. The intelligent control alternating pressurization vacuum preloading dredger fill consolidation test device according to claim 2 is characterized in that: The connecting pipeline 1 also includes a main pipeline 1 and a valve 1 located on the main pipeline 1, and the diversion pipeline 1 and the diversion pipeline 2 are formed by diverting the flow from the end of the main pipeline 1 away from the air compressor; the connecting pipeline 2 includes the main pipeline 2 and the valve 2 located on the main pipeline 2, and the diversion pipeline 3 and the diversion pipeline 4 are formed by diverting the flow from the end of the main pipeline 2 away from the steam-water separator; the connecting pipeline 3 is respectively provided with a valve 3 close to the steam-water separator and a valve 4 close to the vacuum pump.

4. The intelligent control alternating pressurization vacuum preloading dredger fill consolidation test device according to claim 3 is characterized in that: The multiple measuring instruments include three groups of total measuring instrument groups uniformly arranged in the horizontal direction between the first drain board and the second drain board, each group of total measuring instrument groups includes three groups of sub-measuring instrument groups uniformly arranged in the vertical direction, and each group of sub-measuring instrument groups includes a pore water pressure gauge, a pore air pressure gauge and a vacuum measuring instrument buried in the dredger.

5. The intelligent control alternating pressurization vacuum preloading dredger fill consolidation test device according to claim 4 is characterized in that: Assuming the lateral distance between drain board one and drain board two is L, the three total measuring instrument groups are located at 1 / 4L, 1 / 2L, and 3 / 4L respectively; Assuming the height of drain board one and drain board two is H, the uppermost sub-measuring instrument group among the three total measuring instrument groups is located at 1 / 4H, the middle sub-measuring instrument group is located at 1 / 2H, and the lowermost sub-measuring instrument group is located at 3 / 4H.

6. The intelligent control alternating pressurization vacuum preloading dredger fill consolidation test device according to claim 5 is characterized in that: The box body and the box cover are both made of acrylic material, a rubber cushion layer is provided around the box cover, and the box cover and the box body form a piston structure; the thickness of the box cover is 5-10 cm, and a scale is provided on the outer wall of the box body; a venting pipeline is provided on the box cover, and a valve five is connected to the venting pipeline; connecting pipeline five, connecting pipeline six, and the signal line of the measuring device all pass through the box cover.

7. The intelligent control alternating pressurization vacuum preloading dredger fill consolidation test device according to claim 6 is characterized in that: The steam-water separator is made of acrylic material and is marked with scales; an electronic vacuum gauge is provided on the top of the steam-water separator and an electronic balance is provided on the bottom, and the electronic balance is connected to a computer; the air compressor and the vacuum pump are both graded and adjusted by a computer, the gear position of the air compressor is 0-200kPa, and the gear position of the vacuum pump is 0-100kPa.

8. The intelligent control alternating pressurization vacuum preloading dredger fill consolidation test device according to claim 7 is characterized in that: When conducting the alternating boost vacuum preloading method test, valves 1, 2, 3, 4 and 5 are all in the open state, and the electric three-way valve 1 and the electric three-way valve 2 are in different connection states. During the test, the electric three-way valve 1 and the electric three-way valve 2 are switched in time according to the needs; When the alternating vacuum preloading method is performed, the valve 1 connected to the air compressor is in a closed state, and the electric three-way valve 1 and the electric three-way valve 2 are in different connection states; When the booster vacuum preloading method is used, valves 1, 2, 3, 4 and 5 are all in the open state, and the electric three-way valve 1 and the electric three-way valve 2 are in different connection states. During the test, the electric three-way valve 1 and the electric three-way valve 2 do not need to be switched; When the conventional vacuum preloading method and the graded vacuum preloading method are performed, the valve 1 connected to the air compressor is in a closed state. During the test, the electric three-way valve 1 and the electric three-way valve 2 do not need to be switched. The connection state of the electric three-way valve 1 and the electric three-way valve 2 is determined based on whether the single-plate vacuum preloading or the double-plate vacuum preloading is performed.

9. An intelligent control alternating pressurization vacuum preloading dredger fill consolidation test method, using the test device described in claim 8 for testing, characterized in that: The steps include: S1. Check the air tightness of the box and piping system: before the test, close valve 1 connected to the air compressor and turn on the vacuum pump; close valve 4 connected to the vacuum pump and turn off the vacuum pump simultaneously, collect data from the electronic vacuum meter on the vapor-liquid separator, and if the negative pressure environment can be maintained unchanged, it is considered to be airtight; S2. Loading the dredger fill and burying the measuring device: measuring the moisture content of the obtained dredger fill, loading the obtained dredger fill into the box, and burying the drain board 1, drain board 2, pore water pressure gauge, pore air pressure gauge and vacuum sensor into the dredger fill, measuring the initial moisture content of the dredger fill, turning on the data acquisition instrument and computer, checking whether the pore water pressure gauge, pore air pressure gauge 10 and vacuum sensor can work normally, and setting up the DIC high-speed photography device to prepare for the test; S3. Test setting: Turn on the electronic balance, electric three-way valve 1, electric three-way valve 2, air compressor, vacuum pump, and set the test plan through the computer; S4. Test process: Conduct the test according to the test plan set in the computer; S5: End of the test: Stop the test according to the set conditions, turn off the instrument, open valve 5 above the box cover, take out the dredged fill soil sample in the box and measure the moisture content, export the test data in the computer and analyze it.

10. The intelligent control alternating pressurization vacuum preloading dredger fill consolidation test method according to claim 9 is characterized in that: The computer controls the electric three-way valve 1, the electric three-way valve 2, the air compressor and the vacuum pump in two ways: the computer controls according to the set conversion time cycle, and the computer controls according to the collected data to determine whether the control value is reached; The test scheme in step S3 includes two modes. One mode is to set the alternating pressurization cycle mode of drain board 1 and drain board 2 through a time period, and the time period of the periodic adjustment mode is 1h-7d; the other mode is to perform feedback adjustment based on the data collected during the test. The feedback adjustment mode requires determining the appropriate feedback adjustment threshold through experiments.

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