CN109211521B - Novel sediment wave induced pore pressure response device and testing method - Google Patents
Novel sediment wave induced pore pressure response device and testing method Download PDFInfo
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- CN109211521B CN109211521B CN201811206882.1A CN201811206882A CN109211521B CN 109211521 B CN109211521 B CN 109211521B CN 201811206882 A CN201811206882 A CN 201811206882A CN 109211521 B CN109211521 B CN 109211521B
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- 239000011148 porous material Substances 0.000 title claims abstract description 66
- 239000013049 sediment Substances 0.000 title claims abstract description 56
- 230000004044 response Effects 0.000 title claims abstract description 34
- 238000012360 testing method Methods 0.000 title claims description 24
- 239000012530 fluid Substances 0.000 claims abstract description 59
- 239000007788 liquid Substances 0.000 claims abstract description 53
- 239000000758 substrate Substances 0.000 claims abstract description 44
- 239000000523 sample Substances 0.000 claims abstract description 35
- 230000007246 mechanism Effects 0.000 claims abstract description 34
- 230000008859 change Effects 0.000 claims abstract description 22
- 238000012544 monitoring process Methods 0.000 claims abstract description 20
- 230000009471 action Effects 0.000 claims abstract description 11
- 238000010998 test method Methods 0.000 claims description 9
- 238000002360 preparation method Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 40
- 230000033001 locomotion Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 2
- 238000004088 simulation Methods 0.000 description 15
- 238000000034 method Methods 0.000 description 11
- 230000008569 process Effects 0.000 description 6
- 238000011065 in-situ storage Methods 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 238000011160 research Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012805 post-processing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 239000005341 toughened glass Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M10/00—Hydrodynamic testing; Arrangements in or on ship-testing tanks or water tunnels
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Abstract
The pore pressure response device is provided with a pore pressure monitoring mechanism, the pore pressure monitoring mechanism comprises a pore pressure probe rod and a plurality of pore pressure probes, and the pore pressure response device comprises a fluid barrel, a substrate barrel, a push plate and a driving mechanism; the bottom barrel is arranged in the fluid barrel, the upper edge of the bottom barrel is lower than the upper edge of the fluid barrel, sediment is filled in the bottom barrel, and the hole pressure probe rod is vertically embedded in the sediment; the liquid barrel is filled with liquid medium, the push plate moves up and down in the space between the liquid barrel and the substrate barrel under the action of the driving mechanism, so that the liquid level on the sediment forms fluctuation change, and meanwhile, corresponding sediment internal pore pressure data are obtained through the pore pressure probe when the liquid level changes. The invention can greatly reduce the volume of the existing water tank, simplify the structure of the water tank system, facilitate operation and control and save cost; the liquid level fluctuation is generated by the push plate movement so as to simulate the wave effect.
Description
Technical Field
The invention relates to a sediment simulation system, belongs to the field of ocean engineering geology and ocean disaster geology, and particularly relates to a novel sediment wave induced pore pressure response device and a testing method.
Background
The wave action can produce cyclic load to the seabed sediment, and when the wave action is stronger, the accumulation of the pore pressure in the seabed sediment can be increased or even liquefied, and the sediment liquefaction can greatly reduce the bearing capacity of soil bodies, destabilize offshore engineering facilities, endanger personnel safety and cause property loss, and serious even cause geological or ocean disasters.
Aiming at the problems of pore pressure response and liquefaction under the action of waves, the existing research schemes comprise in-situ monitoring, water tank test and numerical simulation. The conditions of manpower and material resources required by in-situ monitoring are huge, the cost of one-time monitoring is often more than millions, and the in-situ monitoring is greatly influenced by natural factors such as weather and the like in the implementation process. Numerical simulation is a means based on in-situ monitoring and water tank test, and can analyze the mechanism and influencing factors of geological phenomenon in detail and in depth, but is limited by the prior art means, the numerical simulation cannot simulate more complex actual conditions, and only the simple and ideal working condition of the water tank test can be simulated. Thus, the current water tank test is still an important and effective research means for the wave-induced pore pressure response problem.
However, the conventional water tanks tend to be huge in volume, often tens or even hundreds of meters long, and for the sediment most concerned in the wave-induced pore pressure response problem, only a small part of the water tank is usually occupied by a section of the water tank, and most of the water tanks have the volume and structural functions only for wave generation and wave elimination. For tests where sediment portions are of major concern, the large volume of the sink adds substantially to the cost and difficulty of operation of the test.
The applicant has improved and innovated the existing flume system in the previously disclosed "sediment pore pressure response simulation device under wave action (grant publication number CN 207662733U)", and "sediment pore pressure response simulation method under wave action (application publication number CN108332901 a)", but the relative volume is still large.
In order to improve the test efficiency of the wave-induced pore-forming water pressing tank and reduce the use difficulty, a small-sized wave-induced pore-forming pressure analog water tank with small volume, high efficiency and simple operation is needed.
Disclosure of Invention
The invention provides a novel sediment wave pore-creating pressure response device and a testing method, which are used for solving the problems of larger volume, low testing efficiency and high use difficulty of the existing wave pore-creating pressure water tank.
The invention is realized by the following technical scheme:
the novel sediment wave pore-creating pressure response device is provided with a pore-creating pressure monitoring mechanism, the pore-creating pressure monitoring mechanism comprises a pore-creating probe rod and a plurality of pore-creating probes, the pore-creating probes are installed on the pore-creating probe rod at intervals, and the pore-creating pressure response device comprises a fluid barrel, a substrate barrel, a push plate and a driving mechanism; the bottom barrel is arranged in the fluid barrel, the upper edge of the bottom barrel is lower than the upper edge of the fluid barrel, sediment is filled in the bottom barrel, and the hole pressure probe rod is vertically embedded in the sediment; the fluid barrel is filled with a liquid medium, the push plate moves up and down in the space between the fluid barrel and the substrate barrel under the action of the driving mechanism, so that the liquid level on the sediment forms fluctuation change, and meanwhile, corresponding sediment internal pore pressure data during liquid level change is obtained through the pore pressure probe.
In order to further achieve the purpose of the invention, the following technical scheme can be adopted:
the bottom barrel is fixedly connected with the fluid barrel, and the fluid barrel and the bottom barrel are round barrels and have vertical symmetry axes which are overlapped.
The push plate is a circular cylinder with an opening at the bottom, and the inner diameter of the circular cylinder of the push plate is larger than the outer diameter of the circular cylinder of the substrate barrel.
In the initial state that the push plate falls, the lower edge of the push plate is flush with the upper edge of the substrate barrel; the liquid level of the liquid medium filled in the fluid barrel and the substrate barrel is flush with the upper edge of the substrate barrel.
The driving mechanism is an electric, pneumatic or hydraulic device.
The driving mechanism is electrically connected with the control system, the control system is a computer system provided with wave load simulation software, and the computer system controls the driving mechanism to work according to the required push plate moving stroke.
The pore pressure monitoring mechanism is in signal connection with the control system and is used for receiving and processing the pore pressure data in the sediment obtained by the pore pressure probe.
The invention also provides a novel sediment wave induced pore pressure response test method, which comprises the pore pressure response device, wherein the pore pressure response test method comprises a preparation step, a model determination step and a test step;
preparing a sediment sample, paving the sediment sample into a substrate barrel, burying a pore pressure monitoring mechanism, and then injecting liquid medium into the fluid barrel and the substrate barrel;
the model determining step is used for establishing a push plate and liquid level height model according to the corresponding relation between the stroke of the push plate moving up and down and the liquid level change in the fluid barrel;
the test works, the initial position of the push plate is determined, the pore pressure monitoring mechanism is opened, the push plate is driven by the driving mechanism to act, so that the liquid level of the liquid medium on the sediment forms fluctuation change, and corresponding pore pressure data in the sediment are obtained through the pore pressure probe when the liquid level changes.
When the fluid barrel, the substrate barrel and the pushing plate are all round barrels and have vertical symmetry axes which are overlapped, and the liquid level of liquid media filled in the fluid barrel and the substrate barrel is flush with the upper edge of the substrate barrel in the initial state of the falling of the pushing plate, the pushing plate and the liquid level height model are as follows:
wherein r is 2 Is the outer diameter of the base barrel, r 3 Is the inner diameter of the fluid barrel, r 5 、r 6 Respectively the inner diameter and the outer diameter of the push plate, S Ring(s) Is the sectional area of the push plate, h Board board Is the amplitude height of the push plate, S Board board Is the cross-sectional area of the barrel interior of the fluid barrel, h Upper part Is the liquid medium level difference.
In the initial state of the falling push plate, the minimum liquid level height of the liquid medium in the fluid barrel is h min The maximum liquid level height in the fluid barrel after the push plate moves downwards is h max The maximum wave height which can be simulated by the pore pressure response test method is H=h max -h min The method comprises the steps of carrying out a first treatment on the surface of the When the simulated wave height is H Simulation When the period is T, the amplitude height h of the push plate Board board The method comprises the following steps:
wherein h is T Is the amplitude at which the level in the fluid bowl completes at time T.
Compared with the prior art, the invention has the advantages that:
on the basis of guaranteeing a sediment internal pore pressure measurement simulation test, the invention can greatly reduce the volume of the water tank, simplify the structure of a water tank system, save cost, and facilitate operation and control, and the liquid level fluctuation is generated by the movement of the push plate so as to simulate the wave effect. Specifically:
1. the accuracy of the sediment internal pore pressure response measurement test is improved, meanwhile, the complex wave simulation process is simplified into a change of a certain volume of water or water pressure, the change of the seabed surface wave pressure is realized, and the volume and the cost of a traditional water tank are greatly reduced.
2. The method can be used for researching the conditions of pore pressure change, liquefaction and sediment re-suspension in the sediment of the seabed under different wave working conditions, simplifying the hydrodynamic simulation part and simultaneously ensuring the authenticity and reliability of sediment simulation to the greatest extent.
3. The invention can simulate the internal pore pressure response of the sediment under the conditions of different liquid level fluctuation heights, amplitude periods and the like, is convenient for observation, measurement and operation, effectively improves the simulation test efficiency and reduces the operation cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
FIG. 1 is a schematic view of a pore pressure response device according to the first embodiment;
FIG. 2 is a schematic view of the fluid and substrate barrels of FIG. 1;
FIG. 3 is a schematic view of the construction of the push plate shown in FIG. 1;
FIG. 4 is a schematic illustration of the test procedure of the first embodiment, wherein the push plate is shown in FIG. 4a in a displaced state, the push plate is shown in FIG. 4b in an initial position, and the push plate is shown in FIG. 4c at a maximum fluid level;
FIG. 5 is a schematic structural view of a pore pressure response device according to the second embodiment;
FIG. 6 is a schematic structural view of a pore pressure response device according to the third embodiment;
FIG. 7 is a flow chart of a pore pressure response test method according to the present invention.
Reference numeral, 1-pore pressure monitoring mechanism, 2-fluid barrel, 3-push plate, 31-push plate wall, 4-substrate barrel, 5-driving mechanism, 6-control system, 7-sediment, 8-liquid medium, 9-scale and 10-push plate linkage mechanism.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention.
Embodiment one:
as shown in fig. 1 to 4, the novel sediment 7 wave induced pore pressure response device disclosed in this embodiment includes a pore pressure monitoring mechanism 1, a fluid barrel 2, a push plate 3, a substrate barrel 4, a driving mechanism 5, and a control system 6. The wave generating and wave absorbing parts of the water tank system can be greatly reduced, and the fluctuation of the liquid level of the liquid medium on the sediment 7 is changed by the up-and-down movement of the push plate 3.
The side wall of the fluid barrel 2 is provided with scales 9, the fluid barrel 2, the push plate 3 and the substrate barrel 4 are all cylinders with the same vertical symmetry axis and are made of high-strength toughened glass, and the substrate barrel 4 is arranged on the inner side of the fluid barrel 2 and is fixed together through the contacted bottom.
The substrate cartridge 4 is used to fill and hold a sample of sediment 7. The fluid tank 2 is filled with a liquid medium 8, typically water, and when a large sea wave pressure is to be simulated, a dense water mixture may be used. The upper part of the push plate 3 is connected with a driving mechanism 5, and the lower part of the push plate is opened and can move up and down between the fluid barrel 2 and the substrate barrel 4.
The pore pressure monitoring mechanism 1 comprises a pore pressure probe rod and a pore pressure probe, the pore pressure probe is connected with the control system 6 through a data line or Bluetooth and wireless transmitting module, and the control system 6 is a computer system which can acquire, process and property deposit 7 internal pore pressure data in real time.
The driving mechanism 5 adopts an electric push rod, the lower end of the electric push rod is connected with the upper end of the substrate barrel 4, the stability of the push rod in up-and-down motion and wider amplitude frequency are ensured, the driving mechanism 5 is connected with the control system 6, and the working mode of the electric push rod is controlled by setting parameters simulating waves on a computer.
As shown in fig. 3, the push plate 3 is provided with a push plate linkage 10 for fixing the position of the push plate 3 and transmitting a pulling force or pushing force.
The pushing plate wall 31 moves downwards or upwards at a uniform speed, so that the water level between the substrate barrel 4 and the fluid barrel 2 fluctuates, the change of the water level depth on the sediment 7 is realized, the wave action can be simulated, and the detection of the pore pressure data in the sediment 7 is implemented through the pore pressure probe.
As shown in fig. 7, the pore pressure response measurement method disclosed in this embodiment includes a preparation step, a model determination step, a test step, and a post-processing step.
And the preparation step is used for preparing a sediment 7 sample, paving the sediment 7 sample into a substrate barrel, installing equipment such as a pore pressure monitoring mechanism and the like, connecting power supply and data acquisition lines, and injecting water into the fluid barrel and the substrate barrel.
The equipment connection focuses on the arrangement of the pore pressure probe, the signal transmission of the pore pressure probe and the computer system, and the connection of the driving device and the computer system computer and the push plate 3;
collecting a sediment 7 sample according to the requirement of a simulation test, uniformly paving the sediment 7 sample in the substrate barrel 4 and solidifying for a period of time;
a model determining step, namely, establishing a model of the push plate 3 and the liquid level according to the change of the liquid level height of the liquid medium 8 in the fluid barrel 2 caused by the up-and-down movement of the push plate 3;
because the fluctuation of the water level in the fluid barrel 2 is related to the volume of the push rod extending into the water body, when the sectional area of the push rod is invariable or regular variable, the volume of the push rod extending into the water body is in direct proportion to the height of the push rod, therefore, a model of the height of the push plate 3 and the height of the liquid level change is established based on the initial height of the push plate 3, the time-varying data of the wave height at a certain point position is extracted, and the time-varying data of the water level change caused by waves is converted into the time-varying data which are input into a computer.
After the model of the height of the push plate 3 and the height of the liquid level change is established, the automatic control of the up-and-down movement of the push plate 3 is realized by setting parameters such as wave height, wavelength, period and the like of waves and controlling the action of the driving mechanism 5 on the computer system.
As shown in fig. 4, taking the fluid barrel 2, the push plate 3 and the substrate barrel 4 as cylinders with the same vertical symmetry axis as an example, the process of establishing the push plate 3 and the liquid level height model is described.
The inner diameter of the substrate barrel 4 is r1, the outer diameter is r2, and the height is h1; the inner diameter of the fluid barrel 2 is r3, the outer diameter is r4, and the height is h2; the inner diameter of the push plate 3 is r5, the outer diameter is r6, and the height is h3.
The push plate 3 shown in fig. 4a is positioned in a moving process state and is positioned anywhere between the upper end of the substrate barrel 4 and the barrel bottom of the fluid barrel 2.
The push plate 3 shown in FIG. 4b is in an initial state, the upper limit position of the movement of the push plate 3 is a position parallel to the upper edge of the substrate barrel 4, and the fluid barrel 2 has the minimum water level h min I.e. the position is the initial height of the push plate 3.
FIG. 4c shows the push plate 3 in the maximum height state, the lower limit position of the push plate 3 is the inner bottom surface of the fluid barrel 2, and the fluid barrel 2 has the maximum water level h max 。
Therefore, the maximum wave height h=h that the present pore pressure response device can simulate max -h min 。
The annular area surrounded by the substrate barrel 4 and the fluid barrel 2 is as follows:
wherein S is In-stream Is the area surrounded by the inner diameter of the fluid barrel 2, S Outside the bottom Is the area surrounded by the outer diameter of the substrate barrel 4, r 3 Is the inner diameter of the fluid barrel 2, r 2 Is the outer diameter of the substrate barrel 4.
The barrel section area of the push plate 3 is as follows:
wherein r is 6 Is the outer diameter of the push plate 3, r 5 Is the inner diameter of the push plate 3.
When the push plate 3 moves unidirectionally in the H height range on the fluid barrel 2 by H Board board When the distance is measured, the change of the water level is as follows:
when the simulated wave height is H Simulation When the period is T, the water level of the fluid barrel 2 is required to be within the T time, and the process is completed in h T Amplitude change, at this time:
then there are:
parameters such as the moving distance and the period of the push plate 3 are converted according to the simulated working condition requirement, so that the simulated wave height is H Simulation In this case, the push plate 3 is moved up and down with a certain amplitude.
The testing step, the position of the initial push plate 3 is required to be determined, a pore pressure probe acquisition device is opened, wave action is simulated, and the time for starting and ending the test and the pore pressure change data condition are recorded;
and a post-treatment step, wherein after the test is finished, the operation of equipment is stopped, sediment 7 in the substrate barrel, the fluid barrel and water in the substrate barrel are cleaned, and the acquired pore pressure change data are tidied and utilized.
Example two
As shown in fig. 5, the push plate 3 in this embodiment has a cylindrical shape, and simultaneously, the substrate barrel 4 is moved to the inner wall side of the fluid barrel 2 to be close to each other, so as to ensure that the push plate 3 has a larger moving space. And the sediment 7 in the substrate barrel 4 is added with the simulative condition of wave impact by utilizing the backflow blocking of the substrate barrel 4 to the water body at the position close to the wall of the fluid barrel 2. The test procedure for the other equipment and pore pressure response is the same as in embodiment one.
Because the section of the push plate 3 is round or rectangular, and is similar to a round cylinder, the section of the cylindrical push plate 3 is invariable, so that the volume of the push plate 3 extending into the water body and the height of the push plate 3 are in linear proportional relation, and the required water body liquid level height can be simulated.
When the push plate 3 is in the H height range on the fluid barrel 2, the push plate moves unidirectionally by H Board board When the distance is kept, the generated water volume changes to be:
V＝S board board ×h Board board ＝(S In-stream -S Board board )×h Upper part
Thereby obtaining the liquid level h Upper part The method comprises the following steps:
wherein S is In-stream Is the area surrounded by the inner diameter of the fluid barrel 2, S Board board Is the cross-sectional area of the push plate 3.
Example III
As shown in fig. 5, the push plate 3 in this embodiment is conical, the top of the conical cone is downward, that is, after the push plate 3 moves downward to enter the water body, the change adjustment of the volume of the water body and the height of the liquid level is continuously increased, that is, the sectional area of the conical cone extending into the water surface is continuously increased, and the push plate and the height model of the liquid level can be obtained; the push plate 3 moves upward, in contrast. By utilizing the characteristics, the intensity of simulated waves can be enhanced, and dynamic measurement data of the pore pressure response inside the sediment 7 can be obtained. Other aspects are the same as the embodiments.
The technical content that is not described in detail in the invention is known in the prior art.
Claims (2)
1. The novel sediment wave pore-creating pressure response test method comprises a pore-creating pressure response device, wherein the pore-creating pressure response device is provided with a pore-creating pressure monitoring mechanism, the pore-creating pressure monitoring mechanism comprises a pore-creating pressure probe rod and a plurality of pore-creating pressure probes, the pore-creating pressure probes are arranged on the pore-creating pressure probe rod at intervals,
the pore pressure response device comprises a fluid barrel, a substrate barrel, a push plate and a driving mechanism; the bottom barrel is arranged in the fluid barrel, the upper edge of the bottom barrel is lower than the upper edge of the fluid barrel, sediment is filled in the bottom barrel, and the hole pressure probe rod is vertically embedded in the sediment; the fluid barrel is filled with a liquid medium, the push plate moves up and down in the space between the fluid barrel and the substrate barrel under the action of the driving mechanism, so that the liquid level on the sediment forms fluctuation change, and meanwhile, corresponding sediment internal pore pressure data during liquid level change is obtained through the pore pressure probe;
the pore pressure response test method comprises a preparation step, a model determination step and a test step;
preparing a sediment sample, paving the sediment sample into a substrate barrel, burying a pore pressure monitoring mechanism, and then injecting liquid medium into the fluid barrel and the substrate barrel;
the model determining step is used for establishing a push plate and liquid level height model according to the corresponding relation between the stroke of the push plate moving up and down and the liquid level change in the fluid barrel;
and in the test step, the initial position of the push plate is determined, the pore pressure monitoring mechanism is opened, the push plate is driven by the driving mechanism to act so that the liquid level of the liquid medium on the sediment forms fluctuation change, and corresponding pore pressure data in the sediment are obtained through the pore pressure probe when the liquid level changes.
2. The novel sediment wave pore-creating pressure response test method according to claim 1, wherein when the fluid barrel, the substrate barrel and the pushing plate are all round barrels and have vertical symmetry axes which are overlapped, and the pushing plate falls in an initial state, liquid levels of liquid media filled in the fluid barrel and the substrate barrel are all flush with the upper edge of the substrate barrel, the push plate and the liquid level height model are as follows:
wherein S is In-stream Is the area surrounded by the inner diameter of the fluid barrel S Board board Is the sectional area of the push plate, h Board board The amplitude height of the push plate is h Upper part Is the liquid medium level difference.
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| CN201811206882.1A CN109211521B (en) | 2018-10-17 | 2018-10-17 | Novel sediment wave induced pore pressure response device and testing method |
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