CN114235663A - Liquefied soil filling performance test method and device - Google Patents
Liquefied soil filling performance test method and device Download PDFInfo
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- CN114235663A CN114235663A CN202111558717.4A CN202111558717A CN114235663A CN 114235663 A CN114235663 A CN 114235663A CN 202111558717 A CN202111558717 A CN 202111558717A CN 114235663 A CN114235663 A CN 114235663A
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- 239000002689 soil Substances 0.000 title claims abstract description 70
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000011056 performance test Methods 0.000 title claims description 14
- 238000004088 simulation Methods 0.000 claims abstract description 64
- 239000000463 material Substances 0.000 claims abstract description 51
- 238000012360 testing method Methods 0.000 claims abstract description 32
- 239000000945 filler Substances 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 5
- 230000003044 adaptive effect Effects 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000000126 substance Substances 0.000 claims description 2
- 238000010276 construction Methods 0.000 abstract description 7
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000012780 transparent material Substances 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
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Chemical & Material Sciences (AREA)
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- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
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- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a method and a device suitable for testing filling performance of liquefied soil, comprising a simulation box, a pressure gauge, a material conveying pump, a safety valve and a material feeding system; the pressure value of the safety valve is set according to factors such as site working conditions, liquefied soil strength and the like, and the filling height of the liquefied soil can be read. The liquefied soil filling performance testing device can efficiently, conveniently, quickly and accurately test and evaluate the filling performance of liquefied soil, ensures the construction quality of a liquefied soil filling layer, and has a simple structure and reliable performance.
Description
Technical Field
The invention belongs to the technical field of liquefied soil filling performance testing, relates to a liquefied soil filling performance testing method and device, and particularly relates to a liquefied soil filling performance testing method and an evaluation index testing device.
Background
In the backfill construction process of various foundation trenches, the problems of narrow backfill space, large depth, unstable tamping quality of backfill soil, non-compact backfill soil, easy subsidence after backfill and the like are often encountered. In order to ensure the engineering quality, plain concrete is usually adopted for backfilling, but the backfilling cost of the plain concrete is high, the difficulty of later maintenance is high, and the wide-range popularization and application are limited. In recent years, liquefied soil with low cost and good performance index becomes an important application material for backfill construction.
The liquefied soil is a material which is formed by uniformly stirring soil, a cementing material and water (an additive can be added if necessary) according to a certain proportion, has good fluidity, is constructed by adopting a pouring mode and the like, and has certain strength and durability after being hardened. In recent years, the liquefied soil is widely applied to various projects such as backfill of foundation pits, pipe culverts, cavities, goafs, roadways and the like, and due to the excellent working performance of the liquefied soil, such as high fluidity, the liquefied soil is well attracted by project builders.
However, no evaluation index and method for the filling performance of the liquefied soil under different working conditions are established. How to effectively evaluate the filling performance of the liquefied soil under different working conditions is very important for determining parameters such as filling distance in the subsequent construction process. Therefore, the method and the device for testing the filling performance under different working conditions are designed, a scientific detection standard is formed, effective basis is rapidly and accurately provided for the liquefied soil with different strengths and the filling distance under different working conditions, the blank of the prior art is filled, and the application and development of the liquefied soil technology can be effectively promoted.
Disclosure of Invention
The invention aims to provide a test device and a test method which can simulate the filling condition of liquefied soil under different working conditions, ensure the construction quality of a liquefied soil filling layer and quickly and accurately test the filling performance of the liquefied soil.
In order to realize the purpose of the invention, the following technical scheme is adopted for realizing the purpose:
a test device for liquefied soil filling performance tests comprises a simulation box, a pressure gauge, a delivery pump, a safety valve and a feeding system. The simulation box, the pressure gauge, the material conveying pump and the material supply system are sequentially connected, a branch is arranged between the material conveying pump and the pressure gauge, the branch is connected with the safety valve, and the tail end of the branch is connected with the material supply system. The simulation box is a transparent rigid shell, a detachable upper cover made of the same material is arranged above the simulation box, and an exhaust hole is reserved in the upper cover; the simulation box is characterized in that a feed inlet is formed in the lower portion of the simulation box, filler for simulating working conditions is filled in the simulation box, the feed inlet in the bottom of the simulation box is connected with a delivery pump through a main pipeline, the delivery pump is connected with a feeding system through the main pipeline, the delivery pump is connected with a safety valve through a branch pipeline, and the safety valve is connected with the feeding system through a branch pipeline; and a pressure gauge is arranged on a main pipeline connected with the feed inlet at the bottom of the simulation box.
The liquefied soil filling performance test device has the following beneficial effects:
firstly, the simulation box of the device adopts transparent materials, can directly observe the filling process of the liquefied soil in the test block, objectively, comprehensively and clearly reflects the filling performance of the liquefied soil under different working conditions, and is effective supplement for testing and evaluating the working performance of the liquefied soil.
And the lower end of the simulation box is connected with the feed inlet, the upper end of the simulation box is provided with a detachable fastening upper cover, and the simulation box is simple to install, disassemble and clean.
And thirdly, the feed inlet is arranged below the transparent rigid simulation box, so that the influence of gravity on the filling performance is eliminated, and the data reality degree is high.
And fourthly, the safety valve can be opened when the set pressure is reached, the system pressure is constant after the safety valve is opened, the filling height is unchanged, and the filling height is read after the pressure is maintained for t seconds, so that errors caused by manually closing the material delivery pump are avoided.
Fifth, diameter of pipe of connecting deviceD≥1.5d 1The diameter phi of the simulation box is more than or equal to 1.5d 2，d 1＜d 2And the liquefied soil particles are not influenced by the pipeline boundary and the simulation box boundary, so that the test data has high truth.
And sixthly, after the test is finished, the filler simulating the working condition can be poured out and cleaned for reuse. The test needs less liquefied soil, avoids manpower and material resources required by the field actual measurement test, and has good economical efficiency.
In addition, in order to achieve the purpose of the invention, the invention also provides a liquefied soil filling performance test method, which comprises the following steps:
(1) fixing the simulation box;
(2) a feed inlet at the bottom of the simulation box is connected with a pressure gauge, a material conveying pump and a material feeding system sequentially through a main pipeline;
(3) a branch pipeline is arranged between the pressure gauge of the main pipeline and the material conveying pump and is connected with a safety valve, and the tail end of the branch pipeline is connected with a feeding system;
(4) checking the tightness of the device and the integrity of the equipment;
(5) uniformly filling filler for simulating the working condition in the simulation box according to the test working condition and fastening an upper cover;
(6) checking the exhaust holes to ensure the smoothness of the upper exhaust holes;
(7) setting the pressure value of the safety valve to be P according to the field working condition, and starting the material conveying pump; when the pressure value is less than P, the liquefied soil enters the simulation box through the material conveying pump, when the pressure value is more than or equal to P, the safety valve is opened, the pressure of the device is maintained at P, and after t seconds of pressure maintaining, the filling height H of the liquefied soil is recorded; h can be used for evaluating the filling performance of the liquefied soil under the test working condition;
(8) after the recording is finished, closing the material conveying pump;
(9) and disassembling the upper cover of the simulation box, pouring the filler and the liquefied soil for simulating the working condition, and cleaning the simulation box.
The liquefied soil filling performance test method has the following beneficial effects: the method has high test sensitivity. In the test, parameters such as water consumption, curing agent amount, cementing materials and the like which obviously affect the performance of the liquefied soil are changed, so that the purposes of changing the performance of the liquefied soil and comparing the filling performance of different liquefied soils and different working conditions are achieved. The test result of the device shows that the filling performance of the liquefied soil is obviously influenced by the small change of the raw material composition, and the test method has good sensitivity.
The liquefied soil filling performance testing device is reasonable in design, simple in structure and reliable in performance, the testing method can efficiently, conveniently, rapidly and accurately evaluate the filling performance of the liquefied soil, the construction quality of the liquefied soil filling layer is guaranteed, and the liquefied soil filling performance testing device has good practical application value.
Drawings
FIG. 1 is a schematic view showing the structure of a liquefied soil filling performance test apparatus according to the present invention.
FIG. 2 is a flow chart showing a method for testing the filling performance of liquefied soil according to the present invention.
In the figure: 1-vent hole, 2-upper cover, 3-shell, 4-filler simulating working condition, 5-feed inlet, 6-pressure gauge, 7-feed delivery pump, 8-safety valve, 9-feeding system, 10-main pipeline and 11-branch pipeline.
Detailed Description
In order to make the technical solution and advantages of the present invention clearer, an embodiment of the present invention is described below with reference to the accompanying drawings, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification.
A liquefied soil filling performance test device is shown in figure 1 and structurally comprises a simulation box 3, a pressure gauge 6, a material conveying pump 7, a safety valve 8, a feeding system 9 and the like. The simulation box 3 is fixedly provided with an upper cover 2, and the upper cover 2 is provided with an exhaust hole 1; the simulation box 3 is filled with filler 4 for simulating working conditions, a feed inlet 5 at the bottom of the simulation box 3 is connected with a material conveying pump 7 through a main pipeline 10, and the material conveying pump 7 is connected with a feeding system 9 through the main pipeline 10. A branch pipeline 11 is arranged between the pressure gauge 6 and the delivery pump 7 on the main pipeline 10, the delivery pump 7 is connected with a safety valve 8 through the branch pipeline 11, and the safety valve 8 is connected with a feeding system 9 through the branch pipeline 11; and a pressure gauge 6 is arranged on a main pipeline 10 connected with a feeding hole 5 at the bottom of the simulation box 3.
In the specific implementation, the upper part of the simulation box 3 is provided with an exhaust hole 1 and an upper cover 2, and the lower part is provided with a feed inlet 5. Simulation case 3, manometer 6, defeated material pump 7, feeding system 9 loop through main line 10 and connect, set up branch pipe line 11 between defeated material pump 7 and the manometer 6 and connect relief valve 8, branch road end connection feeding system 9.
During the concrete implementation, the casing of simulation case 3 comprises transparent rigidity organic plastic, and the simulation case is the cylinder, and diameter phi =30cm, and the box height L =200cm, upper portion set up with the detachable upper cover 2 of material. Of course, in this example, the simulation box 3 may be formed of other transparent rigid materials, such as a rectangular parallelepiped, and is not limited herein. An air vent 1 is reserved in the upper cover, and the air vent 1 is arranged to be a cylinder with the diameter of 5cm and the height of 20 cm. Of course, in this example, the vent holes 1 may be provided in other shapes, and the number of the vent holes 1 may be plural, which is not limited herein. Scales are arranged outside the shell of the simulation box 3, the scale range is 0-200 cm, and the precision is 1 cm. Of course, in this example, a 5m measuring tape may be prepared for reading the filling level, which is not limited herein.
During specific implementation, the diameters of the main pipeline, the branch pipeline and the feed inlet of the delivery pump discharge port and the simulation box feed inlet are equalD≥1.5d 1，d 1The maximum diameter of the particles contained in the liquefied soil; the diameter phi of the simulation box is more than or equal to 1.5d 2，d 2The maximum diameter of particles contained in the filler for simulating the working condition; wherein the content of the first and second substances,d 1＜d 2。
the size of a feed inlet at the lower part of the shell of the simulation box is in adaptive connection with one end of a feed delivery pump. One end of the delivery pump is in adaptive connection with the feed inlet of the simulation box, the connection mode can be flange and external thread short connection, and other connection modes can also be adopted, and the connection mode is not limited uniquely;
the other end of the delivery pump and the tail end of the branch are respectively connected with a feeding system 9. The feeding system 9 may be a finished product temporary storage bin, a material conveying vehicle, etc., and is not limited herein.
In this example, the safety valve setting value is specifically set according to factors such as test conditions, liquefied soil strength and the like, and is not limited herein.
A liquefied soil filling performance test method is disclosed, as shown in figure 2, firstly fixing a simulation box shell, wherein the height of the simulation box is L; connect gradually simulation case, manometer, conveying pump and feeding system. A pipeline is arranged between the material conveying pump and the pressure gauge and is connected with a safety valve, and the tail end of the pipeline is connected with a material supply system; the integrity and sealing of the entire device was then checked. Filling filler for simulating the working condition in the simulation box uniformly according to the test working condition, fastening the upper cover, and checking the exhaust hole to ensure the exhaust hole to be smooth; setting the pressure value of a safety valve as P, and starting a material conveying pump; and recording the filling height H of the liquefied soil. After the recording is finished, closing the material conveying pump; and (4) disassembling the upper cover of the simulation box, pouring the filler and the liquefied soil, and cleaning the simulation box and the filler.
The method comprises the following specific steps:
(1) fixing the simulation box shell 3;
(2) a feed port 5 of the simulation box 3 is connected with a pressure gauge 6, a material conveying pump 7 and a material feeding system 9 sequentially through a main pipeline 10;
(3) a branch pipeline 11 is arranged between the pressure gauge 6 and the material conveying pump 7 on the main pipeline 10 and is connected with a safety valve 8, and the tail end of the branch pipeline is connected with a feeding system 9;
(4) checking the tightness of the device and the integrity of the equipment;
(5) uniformly filling filler 4 for simulating the working condition in the simulation box 3 according to the test working condition and fastening the upper cover 2;
(6) checking the exhaust holes 1 to ensure the smoothness of the upper exhaust holes 1;
(7) and setting the pressure value of the safety valve to be P according to the field working condition, and starting the material delivery pump 7. When the pressure value is less than P, the liquefied soil enters the simulation box 3 through the material conveying pump 7, when the pressure value is more than or equal to P, the safety valve 8 is opened, the pressure of the device is maintained at P, and after t seconds of pressure maintaining, the filling height H of the liquefied soil is recorded; h can be used for evaluating the filling performance of the liquefied soil under the test working condition;
(8) after the recording is finished, the material conveying pump 7 is closed;
(9) and the upper cover 2 of the simulation box is disassembled, the filler 4 and the liquefied soil for simulating the working condition are poured out, and the simulation box 3 is cleaned completely.
The method can effectively evaluate the filling performance of the liquefied soil, and provides an effective basis for determining parameters such as filling distance in the subsequent construction process.
It should be noted that the structures, the proportions, the sizes, and the like, which are illustrated in the accompanying drawings are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used for limiting the present invention, so that the present invention has no technical essence, and any structural modifications and changes in proportion relation thereto do not affect the efficacy and the achievable purpose of the present invention. Are intended to fall within the scope of the present disclosure. Meanwhile, the numerical values of the dimensions and the terms such as up, down, left and right, etc. cited in the present invention are for clarity of description only, and do not limit the scope of the present invention, and the relative relationship between the numerical values and the terms is not substantially changed or adjusted within the technical scope of the present invention.
Although the present invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention.
Claims (5)
1. The liquefied soil filling performance test device is characterized in that: the simulation box comprises a simulation box (3), wherein an upper cover (2) is fixedly arranged on the simulation box (3), and an exhaust hole (1) is formed in the upper cover (2); the simulation box (3) is filled with filler (4) for simulating working conditions, a feed inlet (5) at the bottom of the simulation box (3) is connected with a material delivery pump (7) through a main pipeline (10), the material delivery pump (7) is connected with a material supply system (9) through the main pipeline (10), the material delivery pump (7) is connected with a safety valve (8) through a branch pipeline (11), and the safety valve (8) is connected with the material supply system (9) through the branch pipeline (11); and a pressure gauge (6) is arranged on a main pipeline (10) connected with the feed inlet (5) at the bottom of the simulation box (3).
2. The liquefied soil filling performance test apparatus according to claim 1, wherein: the feeding system (9) is a finished product material temporary storage bin or a material conveying vehicle.
3. The liquefied soil filling performance test apparatus according to claim 1, wherein: diameter of main pipeline and branch pipeline of material conveying pump discharge port and simulation box feed port adaptive connectionD≥1.5d 1，d 1Is the maximum diameter of the particles contained in the liquefied soil.
4. The liquefied soil filling performance test apparatus according to claim 3, wherein: the diameter phi of the simulation box (3) is more than or equal to 1.5d 2，d 2The maximum diameter of particles contained in the filler for simulating the working condition; wherein the content of the first and second substances,d 1＜d 2。
5. a liquefied soil filling performance test method according to the apparatus of claim 1, comprising the steps of:
(1) fixing the simulation box (3);
(2) a feed inlet (5) at the bottom of the simulation box (3) is connected with a pressure gauge (6), a material conveying pump (7) and a material supply system (9) sequentially through a main pipeline (10);
(3) a branch pipeline (11) is arranged between a pressure gauge (6) of the main pipeline (10) and the material conveying pump (7) and is connected with a safety valve (8), and the tail end of the branch pipeline is connected with a feeding system (9);
(4) checking the tightness of the device and the integrity of the equipment;
(5) uniformly filling filler (4) for simulating the working condition in the simulation box (3) according to the test working condition and fastening the upper cover (2);
(6) checking the exhaust holes (1) to ensure the smoothness of the upper exhaust holes (1);
(7) setting the pressure value of a safety valve (8) to be P according to the field working condition, and starting a material conveying pump (7); when the pressure value is less than P, the liquefied soil enters the simulation box (3) through the material conveying pump (7), when the pressure value is more than or equal to P, the safety valve (8) is opened, the pressure of the device is maintained at P, and after t seconds of pressure maintaining, the filling height H of the liquefied soil is recorded; h, the filling performance of the liquefied soil under the test working condition is evaluated;
(8) after the recording is finished, closing the material conveying pump (7);
(9) and disassembling the upper cover (2) of the simulation box, pouring out the filler (4) and the liquefied soil for simulating the working condition, and cleaning the simulation box (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202111558717.4A CN114235663A (en) | 2021-12-20 | 2021-12-20 | Liquefied soil filling performance test method and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111558717.4A CN114235663A (en) | 2021-12-20 | 2021-12-20 | Liquefied soil filling performance test method and device |
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| CN114235663A true CN114235663A (en) | 2022-03-25 |
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| CN202111558717.4A Pending CN114235663A (en) | 2021-12-20 | 2021-12-20 | Liquefied soil filling performance test method and device |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11256681A (en) * | 1998-03-06 | 1999-09-21 | Penta Ocean Constr Co Ltd | Execution method of concrete structure |
| JP2006078391A (en) * | 2004-09-10 | 2006-03-23 | Sumikon Serutekku Kk | Soil-packed column test system |
| CN101893538A (en) * | 2010-07-16 | 2010-11-24 | 中南大学 | Self-compacting concrete filling performance testing device |
| JP2015108260A (en) * | 2013-12-05 | 2015-06-11 | 日本工業検査株式会社 | Filling detection system for fresh concrete used in construction work |
| KR20170030865A (en) * | 2015-09-10 | 2017-03-20 | 현대중공업 주식회사 | Test Apparatus for Evaluating the Filling Ability of Graut |
-
2021
- 2021-12-20 CN CN202111558717.4A patent/CN114235663A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11256681A (en) * | 1998-03-06 | 1999-09-21 | Penta Ocean Constr Co Ltd | Execution method of concrete structure |
| JP2006078391A (en) * | 2004-09-10 | 2006-03-23 | Sumikon Serutekku Kk | Soil-packed column test system |
| CN101893538A (en) * | 2010-07-16 | 2010-11-24 | 中南大学 | Self-compacting concrete filling performance testing device |
| JP2015108260A (en) * | 2013-12-05 | 2015-06-11 | 日本工業検査株式会社 | Filling detection system for fresh concrete used in construction work |
| KR20170030865A (en) * | 2015-09-10 | 2017-03-20 | 현대중공업 주식회사 | Test Apparatus for Evaluating the Filling Ability of Graut |
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