CN210347500U

CN210347500U - CT scanning consolidation apparatus

Info

Publication number: CN210347500U
Application number: CN201920868029.XU
Authority: CN
Inventors: 陈世壮; 梁晖; 王如宾
Original assignee: Hohai University HHU
Current assignee: Hohai University HHU
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2020-04-17
Anticipated expiration: 2029-06-11

Abstract

The utility model discloses a CT scanning consolidation apparatus, which comprises an upper device and a lower device; the upper device comprises a pneumatic pressurizing device, a guide rail and a piston, and the piston slides in the cylinder along the guide rail; the lower device comprises a pressure chamber with a pressurizing top cover and used for containing the sample, a displacement sensor, a drainage channel and a CT scanning device, wherein the displacement sensor is positioned at the bottom of the pressure chamber and used for measuring the sedimentation displacement of the sample. When the device is used, the device pressurizes the cylinder, when the piston is pushed by air pressure to contact the pressurizing top cover, the display data on the displacement sensor is observed, if the display data changes, the pressurization is stopped, and the sample settlement displacement data displayed by the displacement sensor is recorded; then setting various pressure values for pressurization and recording data; CT scanning equipment is adopted to obtain CT scanning pictures and data in the experiment. The stability and the accuracy are ensured by adopting a pneumatic pressurization mode; and simultaneously realizes the conversion of high-pressure and low-pressure consolidation compression tests.

Description

CT scanning consolidation apparatus

Technical Field

The utility model relates to a consolidation apparatus among experimental and the check out test set especially relates to a CT scanning consolidation apparatus.

Background

The consolidation test is a basic test item in engineering geological exploration geotechnical tests, and indexes of compression coefficient, compression index, rebound coefficient, consolidation coefficient, early consolidation stress and the like of soil can be measured through the consolidation test. Commonly used consolidators are lever and pound scale. The lever type instrument is low in price and simple to operate, so that the lever type instrument is widely applied at present. However, the single lever type consolidometer applies pressure to the sample step by step through a fixed weight, and the manual operation is complicated. And the manual weight application has certain impact force, certain disturbance to the sample, error in reading, low efficiency and easy interference from external factors.

SUMMERY OF THE UTILITY MODEL

Utility model purpose: not enough to prior art, the utility model provides a CT scanning consolidation apparatus, this test device can carry out consolidation test simply conveniently, and it is slow to have solved present ordinary lever, the artifical reading of platform scale formula consolidation apparatus, and the error is big, and pressurization pressure is unstable, the inefficiency scheduling problem.

The technical scheme is as follows: the utility model discloses a CT scanning consolidation apparatus, which comprises an upper device and a lower device; the upper device comprises a pneumatic pressurizing device, a guide rail and a piston, and the piston slides along the guide rail in the pneumatic pressurizing device; the lower device comprises a pressure chamber with a pressurizing top cover and used for containing the sample, a displacement sensor, a drainage channel and a CT scanning device, wherein the displacement sensor is positioned at the bottom of the pressure chamber and used for measuring the sedimentation displacement of the sample.

Still include permeable stone and lower permeable stone, go up permeable stone upper surface and be equipped with the drain board, lower permeable stone lower surface is equipped with down the drain board.

Has the advantages that: compared with the prior art, the utility model has the advantages of it is following:

(1) compared with the common lever type or platform scale type consolidometer, the pneumatic pressurization mode is adopted to ensure the stability and accuracy in the pressurization process; and the pressurization range is enlarged, the conversion of high-pressure consolidation and low-pressure consolidation compression tests can be realized simultaneously, and the method is suitable for various projects. The device has light structure and simple loading and unloading.

(2) Automatically acquiring sedimentation displacement data through a displacement sensor, and considering that the consolidation is stable when the hourly change of a sample is less than or equal to 0.005 mm; and a countdown device is arranged, so that the problems of slow manual reading, large error, unstable pressurizing pressure, low efficiency and the like are solved.

(3) The device is provided with a guide rail, so that the piston slowly slides under the action of air pressure to apply pressure to the pressurizing top cover and is arranged on the pressurizing support frame, the stability of an instrument in the pressurizing process is ensured, and the test error is reduced.

(4) The surfaces of the upper permeable stone and the lower permeable stone are provided with drainage plates which are communicated through an axial drainage channel, so that the automatic drainage function is realized; and set up pore pressure appearance at the outlet, record pore pressure, solved the artifical problem of forgetting the drainage, realized consolidation test under the different drainage conditions.

(5) The utility model discloses a CT scanning equipment observes sample inner structure's change in real time, obtains clear CT scanning picture and CT data, and then can carry out quantitative description to the structural damage evolution of sample.

(6) The utility model has light structure and simple loading and unloading; the soil stabilizer can be used for not only saturated soil but also various unsaturated soils; the soil modifier can be used for undisturbed soil and remolded soil.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

As shown in fig. 1, the utility model discloses full-automatic CT scans consolidation apparatus, including atmospheric pressure pressurized equipment 1, pressurization support frame 2, guide rail 3, piston 4, soil sample 5, pressurization top cap 6, go up drain board 7, cylindric pressure chamber 8, permeable stone 9, CT scanning equipment 10, drainage channel 11, spill base 12, pore pressure appearance 13, lower drain board 14 and displacement sensor 15.

Wherein permeable stone 9 is two, be permeable stone and lower permeable stone respectively, the last surface mounting who goes up permeable stone has last drain board 7, the lower surface mounting who passes through the stone down has lower drain board 14, this lower drain board 14 is located cylindric pressure chamber 8, and the hole that is equipped with vertical direction on the lower drain board 14 is in order to be linked together with drainage channel 11, the automatic drainage function of consolidation apparatus has been realized, and set up hole pressure appearance 13 in drain outlet department, measure pore pressure, the manual work has been solved and has forgotten the drainage, consolidation test under the different drainage conditions has been realized.

In the air pressure pressurizing device 1, pressurization is automatically set through a corresponding measurement control system, the pressure and the pressurizing interval time are accurately controlled, and step-by-step loading is completed.

After the sample is ready for installation, the air pump is first turned on and then the device is checked for leaks. The air pump is used for pressurizing the air pressure pressurizing equipment 1 under the condition of no air leakage, when the piston 4 is pushed by air pressure to contact the pressurizing top cover 6, whether the display data on the displacement sensor has micro motion or not is observed, if the display data have micro motion, the pressurization is stopped, and if the display data do not have micro motion, the testing device is installed again for repeated testing. And reading and recording the displacement sensor 15, namely automatically acquiring sedimentation displacement data through the displacement sensor 15, and then respectively setting the pressure of 12.5kPa, 25kPa, 50kPa, 100kPa, 200kPa, 400kPa, 800kPa, 1600kPa and 3200kPa for pressurization and recording the data. When the change of the sample settling displacement deformation per hour is ≦ 0.005mm, the consolidation is considered to be stable. And finally, drawing e-lgp and e-p curves and analyzing the compression consolidation characteristics of the sample.

The full-automatic consolidation apparatus is provided with a countdown device for outputting a countdown signal, and comprises a control device coupled with the countdown device to receive the countdown signal and output a control signal, an indicating device coupled with the control device to receive the control signal and corresponding to the control signal to realize indication, and a wireless transmission device coupled with the control device to receive a wireless transmission signal, wherein the wireless transmission device is coupled with a vibration device to receive the wireless transmission signal and corresponding to the wireless transmission signal to realize remote vibration. By using the countdown device, the starting use time of the full-automatic consolidation apparatus is timed, and indication and remote vibration prompt are carried out.

In the test process, the change of the internal structure of the sample is observed in real time by adopting a CT scanning device, clear CT scanning pictures and CT data are obtained, and further the structural damage evolution of the sample can be quantitatively described.

The device carries out full-automatic processing to pressurization, displacement settlement, drainage process to carry out CT scanning to the sample and handle, realized can be to the real-time observation of sample inner structure change in the testing process.

The utility model discloses a concrete application steps as follows:

1. firstly, a sample is prepared by using a cutting ring, the mass of the sample is measured, the density of the sample is calculated according to the volume, and the initial water content is measured by using the test residual soil.

2. The concave base 12 of the instrument is horizontally arranged on a rigid foundation, the lower drainage plate 14 and the pore pressure instrument 13 are installed, the permeable stone 9, the filter paper and the retaining ring are placed, then the soil sample 5 is placed in the cylindrical pressure chamber 8, and the filter paper, the permeable stone 9, the upper drainage plate 7 and the pressurizing top cover 6 are sequentially placed.

3. Placing the consolidation container under the pressurizing support frame 2, aligning the consolidation container with the upper piston 4, and pressurizing the sample by adopting a pneumatic pressurizing mode; the piston 4 is slid along the guide rail 3 by the air pressure to press the pressurizing top cover 6.

4. The pressurization is automatically set through a corresponding measurement control system, the pressure and the pressurization interval time are accurately controlled, and the step-by-step loading is completed. And settlement displacement data is automatically collected by the displacement sensor 15, and when the hourly change in deformation of the sample is not more than 0.005mm, the consolidation is considered to be stable.

5. In the test process, the change of the internal structure of the sample is observed in real time by adopting the CT scanning equipment 10, clear CT scanning pictures and CT data are obtained, and further, the structure damage evolution of the sample can be quantitatively described.

Claims

1. A CT scan consolidometer, comprising: comprises an upper device and a lower device; the upper device comprises a pneumatic pressurizing device (1), a guide rail (3) and a piston (4), wherein the piston (4) slides along the guide rail (3) in the pneumatic pressurizing device (1); the lower device comprises a pressure chamber (8) which is provided with a pressurizing top cover (6) and contains the sample, a displacement sensor (15), a drainage channel (11) and a CT scanning device (10), wherein the displacement sensor (15) is positioned at the bottom of the pressure chamber (8) and is used for measuring the sedimentation displacement of the sample.

2. The CT scan consolidator of claim 1, wherein: still include permeable stone and lower permeable stone, it is equipped with drain bar (7) on the permeable stone upper surface to go up, permeable stone lower surface is equipped with down drain bar (14) down, be equipped with the hole on the lower drain bar in order to communicate with drainage channel.

3. The CT scan consolidator of claim 1, wherein: and a pore pressure instrument (13) is arranged on the drainage channel (11).

4. The CT scan consolidator of claim 1, wherein: a countdown device is also included.

5. The CT scan consolidator of claim 1, wherein: the upper device is fixed above the lower device through a support frame.

6. The CT scan consolidator of claim 1, wherein: the device also comprises a base, wherein the base is positioned below the lower device.

7. The CT scan consolidator of any one of claims 1 to 6, wherein: the pressure chamber is cylindrical.