CN114563242A - Method for preparing in-situ deepwater sediment through indoor simulation - Google Patents
Method for preparing in-situ deepwater sediment through indoor simulation Download PDFInfo
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- CN114563242A CN114563242A CN202210186808.8A CN202210186808A CN114563242A CN 114563242 A CN114563242 A CN 114563242A CN 202210186808 A CN202210186808 A CN 202210186808A CN 114563242 A CN114563242 A CN 114563242A
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- 239000013049 sediment Substances 0.000 title claims abstract description 81
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000004088 simulation Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 103
- 239000002689 soil Substances 0.000 claims abstract description 74
- 239000002002 slurry Substances 0.000 claims abstract description 61
- 238000002360 preparation method Methods 0.000 claims abstract description 51
- 238000003860 storage Methods 0.000 claims abstract description 17
- 239000000126 substance Substances 0.000 claims abstract description 17
- 238000007596 consolidation process Methods 0.000 claims abstract description 16
- 238000005086 pumping Methods 0.000 claims abstract description 16
- 238000005516 engineering process Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 11
- 230000000996 additive effect Effects 0.000 claims abstract description 11
- 238000002156 mixing Methods 0.000 claims abstract description 11
- 239000012153 distilled water Substances 0.000 claims abstract description 10
- 150000003839 salts Chemical class 0.000 claims abstract description 10
- 239000002985 plastic film Substances 0.000 claims abstract description 9
- 229920006255 plastic film Polymers 0.000 claims abstract description 9
- 239000002734 clay mineral Substances 0.000 claims abstract description 8
- 230000007613 environmental effect Effects 0.000 claims abstract description 8
- 238000011049 filling Methods 0.000 claims abstract description 7
- 238000003756 stirring Methods 0.000 claims abstract description 5
- 239000004033 plastic Substances 0.000 claims description 10
- 239000004744 fabric Substances 0.000 claims description 9
- 230000000704 physical effect Effects 0.000 claims description 8
- 239000004746 geotextile Substances 0.000 claims description 7
- 239000007788 liquid Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 5
- 230000015572 biosynthetic process Effects 0.000 claims description 4
- 238000011068 loading method Methods 0.000 claims description 4
- 238000005189 flocculation Methods 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 2
- 238000005070 sampling Methods 0.000 description 6
- 238000012360 testing method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007619 statistical method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
- G01N2001/386—Other diluting or mixing processes
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- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for preparing an in-situ deepwater sediment by indoor simulation, which comprises the following steps: stirring and mixing the main clay mineral components and the content proportion of the deepwater sediments with distilled water to prepare a slurry sample, and blending the salt, the pH value and the additive content of the slurry sample according to the water chemical environment of the deepwater sediments; filling the prepared slurry sample into a soil sample preparation box and sealing the soil sample preparation box by using a plastic film; controlling the environmental temperature of the soil sample preparation box and the covering pressure of the sample; connecting a water storage tank and a vacuum pump, and adopting a vacuum prepressing technology to drain and solidify the slurry sample; simulated deep water sediments in different consolidation states are obtained by controlling the pumping speed and the time.
Description
Technical Field
The invention relates to the technical field of marine geotechnical tests, in particular to a method for preparing a simulated deep-water sediment with in-situ physical properties of the deep-water sediment.
Background
The sampling technology of the undisturbed deep water sediments is high in requirement and expensive; in addition, the sampling quantity of the same station is limited, so that a large amount of undisturbed soil is difficult to obtain to carry out tests on the engineering mechanical properties of a large amount of sediments, statistical analysis is difficult to be carried out on the rules of the engineering mechanical properties of the sediments under the condition of insufficient samples, and great uncertainty is brought to the design and evaluation of the engineering projects related to deep water in the later period. Therefore, the current situation that the research on the physical properties and the engineering mechanical properties of the sediment depends on-site in-situ sampling at present needs to be changed, and a method for simulating and preparing the deepwater sediment is proposed as a powerful supplement to the deepwater in-situ sampling technology.
The natural soil usually has structural property, the method for preparing the natural structural soil indoors usually adopts cement as an additive, however, the cement hydration effect is strong, the hydration time is long, the prepared structural soil has high bonding strength, and the prepared structural soil is difficult to meet the typical characteristics of deep water sediments and is unstable. In addition, the existing method for artificially preparing the simulated soil rarely considers the water chemical environment of the natural soil, so that the properties of the prepared simulated soil are greatly different from those of the natural soil. For deep water sediments, the water chemical environment, the water pressure and the temperature environment of the deep water sediments are greatly different from those of land sources and shallow seas, and the important factors are considered in the simulation preparation method.
Disclosure of Invention
The invention provides a method for preparing in-situ deep water sediments through indoor simulation, which solves or partially solves the technical problems of poor simulation degree and unstable prepared soil samples in the existing technology for preparing soil samples through manual simulation, and meanwhile, the method provides powerful supplement for on-site in-situ deep water sampling, and solves the problems of high technical requirements and high cost of the current deep water in-situ sampling to a certain extent.
In order to solve the technical problem, the invention provides a method for preparing in-situ deepwater sediments through indoor simulation. The method comprises the following steps:
(1) stirring and mixing a dry soil sample and distilled water to prepare a slurry sample, wherein the dry soil sample contains main clay mineral components of deep water sediments and corresponding mass ratio; (2) blending the salt, the pH value and the additive content of the slurry sample according to the water chemical environment of the deepwater sediments; (3) filling the prepared slurry sample into a soil sample preparation box and sealing the soil sample preparation box by using a plastic film; (4) controlling the environmental temperature of the soil sample preparation box and the covering pressure of the sample; (5) connecting a water storage tank and a vacuum pump, and adopting a vacuum prepressing technology to drain and solidify the slurry sample; (6) simulated deep water sediments in different consolidation states are obtained by controlling the pumping speed and the time.
Further, in the step (1), the dry soil sample and distilled water are fully mixed and stirred according to 2 times of liquid limit to prepare a slurry sample.
Further, the step (2) comprises: according to the water chemical environment of the deepwater sediment, the salt content and the pH value of the slurry sample are respectively proportioned and titrated, and an additive is further used to enhance the cementation between sediment particles in the sediment flocculation process, so that the simulated slurry sample of the deepwater sediment is prepared.
Further, in the step (3), the slurry is sealed by adopting a plastic film. The mud sample is put into soil sample preparation case and plastic seal includes: and (3) laying plastic cloth in the soil sample preparation box, laying a water collecting pipe, a reverse filtering layer and geotextile at the bottom, pouring the slurry sample into the geotextile, placing a foam plate at the top, and sealing the plastic cloth, so that the soil sample and the filtering facilities are sealed in the plastic cloth.
Further, the step (4) comprises: water bath circulation is adopted around the soil sample preparation box, the temperature of the soil sample in the sealing bag is controlled to be the temperature of the deepwater environment, and meanwhile, the top of the soil sample preparation box is provided with an air bag for loading, so that the deepwater water pressure environment is simulated.
Further, the step (5) comprises: the bottom of the soil sample preparation box is connected with a water storage tank, the water storage tank is connected with a vacuum pump, air in a sealed bag of the soil sample preparation box is sucked, the vacuum degree in the bag is improved, the pressure is lower than the atmospheric pressure, the slurry sample starts to drain under the action of the atmospheric pressure, water enters the water storage tank through a connecting pipe at the bottom, the vacuum degree in the bag is gradually improved along with the continuous suction of the vacuum pump, the slurry is gradually drained and solidified under the action of the atmospheric pressure to form a certain cementing structure, and the slurry sample is gradually solidified to form a deepwater deposit by adopting a vacuum prepressing technology.
Further, the step (6) comprises: the pumping speed of the vacuum pump is controlled to control the speed of slurry sample drainage, so that the consolidation speed and the cementation formation of the soil sample can be controlled; further, by controlling the pumping time, the amount of the discharged water of the slurry sample can be controlled, the forming state and the consolidation state of the sediment are controlled, and finally the simulated deepwater sediment with the in-situ physical property in different depth ranges in the deepwater environment is obtained.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages: according to the main clay mineral components and contents of the deepwater sediments, the dry soil sample and distilled water are proportioned according to the liquid limit of 2 and fully stirred and mixed to prepare a slurry sample, and the salt content, the pH value and the additive content of the slurry sample are blended according to the water chemical environment in which the deepwater sediments are located; filling the prepared slurry sample into a soil sample preparation box and sealing the soil sample preparation box by using a plastic film; controlling the environmental temperature of the soil sample preparation box and the covering pressure of the sample; connecting a water storage tank and a vacuum pump, and adopting a vacuum prepressing technology to drain and solidify the slurry sample; simulated deep water sediments in different consolidation states are obtained by controlling the pumping speed and the time. The operation method is simple and effective, can meet the water chemical conditions, temperature and water pressure environment of the in-situ deepwater sediments, and can prepare the stable and repeatable simulated deepwater sediments with in-situ physical properties.
Drawings
FIG. 1 is a schematic flow diagram of a method for simulating the preparation of in-situ deep water sediments indoors according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the layout of a soil sample preparation box, the film sealing after the soil sample is loaded, and the environmental temperature and hydraulic pressure environment control of a sample for the indoor simulation preparation method of in-situ deep-water sediments in FIG. 1;
FIG. 3 is a schematic diagram of the connection of the soil sample preparation tank, the water storage tank and the vacuum pump for the method for preparing in-situ deep water sediments through indoor simulation in FIG. 1.
Detailed Description
Referring to fig. 1, a method for indoor simulation preparation of an in-situ deep water deposit according to an embodiment of the present invention includes the following steps:
step 1: the dry soil sample is mixed with distilled water according to the main clay mineral component and content proportion of the deep water sediment to prepare a slurry sample.
Step 2: and (3) blending the salt, the pH value and the additive content of the slurry sample according to the water chemical environment of the deepwater sediments.
And step 3: and filling the prepared slurry sample into a soil sample preparation box and sealing the soil sample preparation box by using a plastic film.
And 4, step 4: and controlling the environmental temperature of the soil sample preparation box and the covering pressure of the sample.
And 5: connecting a water storage tank and a vacuum pump, and adopting a vacuum prepressing technology to drain and solidify the slurry sample.
Step 6: simulated deep water sediment in different consolidation states is obtained by controlling the pumping speed and the time.
According to the specific embodiment of the application, according to the main clay mineral components and contents of deep-water sediments, a dry soil sample and distilled water are proportioned according to a liquid limit of 2 and are fully stirred and mixed to prepare a slurry sample, and the salt content, the pH value and the additive content of the slurry sample are blended according to the water chemical environment in which the deep-water sediments are located; filling the prepared slurry sample into a soil sample preparation box and sealing the soil sample preparation box by using a plastic film; controlling the environmental temperature of the soil sample preparation box and the covering pressure of the sample; connecting a water storage tank and a vacuum pump, and adopting a vacuum prepressing technology to drain and solidify the slurry sample; simulated deep water sediments in different consolidation states are obtained by controlling the pumping speed and the time. The operation method is simple and effective, can meet the water chemical conditions, temperature and water pressure environment of the in-situ deepwater sediments, and can prepare the stable and repeatable simulated deepwater sediments with in-situ physical properties.
Referring to fig. 2 and 3, under the water chemical environment satisfying the formation of deep water sediments, the temperature and water pressure environment of deep water is realized by water bath and air bag loading (see fig. 2). The deposit prepared by the vacuum preloading technique is good in uniformity and reusable (see fig. 3). Therefore, the method can prepare the simulated deepwater sediments which are stable and repeatable to prepare while completely meeting the water chemical conditions, temperature and water pressure environment of the in-situ deepwater sediments.
Specifically, the dry soil sample comprises main clay mineral components of deep water sediments and corresponding mass ratio.
Specifically, the dry soil sample and distilled water are fully mixed and stirred according to 2 times of liquid limit to prepare a slurry sample.
Specifically, step 2 comprises: according to the water chemical environment of the deepwater sediment, the salt content and the pH value of the slurry sample are respectively proportioned and titrated, and an additive is further used to enhance the cementation between sediment particles in the sediment flocculation process, so that the simulated slurry sample of the deepwater sediment is prepared.
Referring to fig. 2, in step 3, the prepared slurry sample is filled into a soil sample preparation box, and the slurry is sealed by a plastic film.
Specifically, step 3 includes: and (3) laying plastic cloth in the soil sample preparation box, laying a water collecting pipe, a reverse filtering layer and geotextile at the bottom, pouring the slurry sample into the geotextile, placing a foam plate at the top, and sealing the plastic cloth, so that the soil sample and the filtering facilities are sealed in the plastic cloth.
Specifically, step 4 includes: water bath circulation is adopted around the soil sample preparation box, the temperature of the soil sample in the sealing bag is controlled to be the temperature of the deepwater environment, and meanwhile, the top of the soil sample preparation box is provided with an air bag for loading, so that the deepwater water pressure environment is simulated.
Referring to fig. 3, step 5 includes: the bottom of the soil sample preparation box is connected with a water storage tank, the water storage tank is connected with a vacuum pump, air in a sealed bag of the soil sample preparation box is sucked, the vacuum degree in the bag is improved, the pressure is lower than the atmospheric pressure, the slurry sample starts to drain under the action of the atmospheric pressure, water enters the water storage tank through a connecting pipe at the bottom, the vacuum degree in the bag is gradually improved along with the continuous suction of the vacuum pump, the slurry is gradually drained and solidified under the action of the atmospheric pressure to form a certain cementing structure, and the slurry sample is gradually solidified to form a deepwater deposit by adopting a vacuum pre-pressing technology.
Specifically, step 6 comprises: the pumping speed of the vacuum pump is controlled to control the speed of slurry sample drainage, so that the consolidation speed and the cementation formation of the soil sample can be controlled; further, by controlling the pumping time, the amount of the discharged water of the slurry sample can be controlled, the forming state and the consolidation state of the sediment are controlled, and finally the simulated deepwater sediment with the in-situ physical property in different depth ranges in the deepwater environment is obtained.
In order to more clearly describe the examples of the present invention, the following description is made in terms of the method of using the examples of the present invention.
According to the main clay mineral components and contents of deep water sediments, mixing a dry soil sample and distilled water according to a liquid limit ratio of 2, and fully stirring and mixing to prepare a slurry sample;
blending the salt, the pH value and the additive content of the slurry sample according to the water chemical environment of the deepwater sediments;
filling the prepared slurry sample into a soil sample preparation box and sealing the soil sample preparation box by using a plastic film, laying a sand layer and a gravel layer at the bottom of the soil sample box to be used as an inverted filter, and burying a water collecting pipe in the sand layer to uniformly drain the whole slurry sample; and meanwhile, the geotextile is laid under the slurry sample, so that the uniform suction in the test is ensured, the inverted filter layer at the bottom of the soil sample box is not influenced, and the time of repeated tests is saved.
The environmental temperature of the soil sample preparation box and the overlaying pressure of the sample are controlled, water bath circulation is used to enable the temperature environment for forming the sediment to be stable and controllable, and an air bag is adopted to uniformly load the sediment and ensure the uniform drainage and consolidation of the sample;
connecting a water storage tank and a vacuum pump, adopting a vacuum preloading technology to drain and solidify the slurry sample, and using the vacuum preloading technology to synchronously solidify a large-area sample and form a uniform and stable sediment cementation structure;
the simulated deep water sediments in different consolidation states are obtained by controlling the pumping speed and the pumping time, the consolidation states of the sediments in different deposition depths are different, and the sediments in various consolidation states can be simulated and prepared in the same sample preparation equipment by controlling the pumping process and the pumping time.
The method is simple and effective to operate, can meet the water chemical conditions, temperature and water pressure environment of the in-situ deepwater sediments, and can prepare the stable and repeatable simulated deepwater sediments with in-situ physical properties.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (8)
1. A method for preparing in-situ deepwater sediments through indoor simulation is characterized by comprising the following steps:
(1) stirring and mixing the dry soil sample and distilled water to prepare a slurry sample; the dry soil sample contains clay mineral components of deepwater sediments and corresponding mass ratio;
(2) blending the salt, the pH value and the additive content of the slurry sample according to the water chemical environment of the deepwater sediments;
(3) filling the prepared slurry sample into a soil sample preparation box;
(4) controlling the environmental temperature of the soil sample preparation box and the covering pressure of the sample;
(5) connecting a water storage tank and a vacuum pump, and adopting a vacuum prepressing technology to drain and solidify the slurry sample;
(6) simulated deep water sediments in different consolidation states are obtained by controlling the pumping speed and the time.
2. The method for indoor simulation preparation of in-situ deep water sediments as claimed in claim 2, wherein: and (2) fully mixing and stirring the dry soil sample and distilled water according to 2 times of liquid limit in the step (1) to prepare a slurry sample.
3. The method for indoor simulation of preparation of in-situ deep water sediments as claimed in claim 1, wherein the step (2) specifically comprises:
according to the water chemical environment of the deepwater sediment, the salt content and the pH value of the slurry sample are respectively proportioned and titrated, and an additive is further used to enhance the cementation between sediment particles in the sediment flocculation process, so that the simulated slurry sample of the deepwater sediment is prepared.
4. The method for indoor simulation of preparation of in-situ deepwater sediment of claim 1, wherein the step (3) comprises sealing the slurry with a plastic film.
5. The method for indoor simulation of preparation of in-situ deepwater sediments as claimed in claim 4, wherein: and (3) paving plastic cloth in the soil sample preparation box, paving a water collecting pipe, an inverted filter layer and the geotextile at the bottom, pouring the slurry sample into the geotextile, placing a foam plate at the top, and sealing the plastic cloth, so that the soil sample and the filtering facilities thereof are sealed in the plastic cloth.
6. The method for indoor simulation of preparation of in-situ deep water sediments as claimed in claim 1, wherein the step (4) comprises:
water bath circulation is adopted around the soil sample preparation box, the temperature of the soil sample in the sealing bag is controlled to be the temperature of the deepwater environment, and meanwhile, the top of the soil sample preparation box is provided with an air bag for loading, so that the deepwater water pressure environment is simulated.
7. The method for indoor simulation of preparation of in-situ deep water sediments as claimed in claim 1, wherein the step (5) comprises:
the bottom of a soil sample preparation box is connected with a water storage tank, the water storage tank is connected with a vacuum pump, the vacuum pump is started to suck air in a sealed bag of the soil sample preparation box, the vacuum degree in the bag is improved, the pressure is lower than the atmospheric pressure, the slurry sample starts to drain under the action of the atmospheric pressure, water enters the water storage tank through a connecting pipe at the bottom, the vacuum degree in the bag is gradually improved along with the continuous suction of the vacuum pump, the slurry is gradually drained and solidified under the action of the atmospheric pressure to form a certain cementing structure, and the slurry sample is gradually solidified to form deep water sediments by adopting a vacuum pre-pressing technology.
8. The method for indoor simulation of preparation of in-situ deep water sediments as claimed in claim 1, wherein the step (6) comprises:
the pumping speed of the vacuum pump is controlled to control the speed of slurry sample drainage, so that the consolidation speed and the cementation formation of the soil sample can be controlled; further, by controlling the pumping time, the amount of the discharged water of the slurry sample can be controlled, the forming state and the consolidation state of the sediment are controlled, and finally the simulated deepwater sediment with the in-situ physical property in different depth ranges in the deepwater environment is obtained.
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Cited By (1)
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