CN109030315B - Low-stress initial one-dimensional compression-penetration test system and working method thereof - Google Patents
Low-stress initial one-dimensional compression-penetration test system and working method thereof Download PDFInfo
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- 239000002689 soil Substances 0.000 claims abstract description 52
- 238000007596 consolidation process Methods 0.000 claims abstract description 37
- 230000005540 biological transmission Effects 0.000 claims abstract description 26
- 238000012546 transfer Methods 0.000 claims abstract description 24
- 239000011148 porous material Substances 0.000 claims abstract description 17
- 230000035699 permeability Effects 0.000 claims abstract description 10
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- 238000005520 cutting process Methods 0.000 claims description 28
- 239000004575 stone Substances 0.000 claims description 24
- 238000006073 displacement reaction Methods 0.000 claims description 9
- 230000000977 initiatory effect Effects 0.000 claims description 8
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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
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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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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- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
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- Fluid Mechanics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a low-stress initial one-dimensional compression-permeation test system which comprises a test bed, wherein a consolidation container is arranged at the upper part of the test bed, a pressure transfer bolt is arranged at the upper part of the consolidation container, the pressure transfer bolt is connected with a force transmission lever through a pressure transfer frame, a low-stress loading assembly and a high-stress loading assembly are arranged on the force transmission lever, and a water head test assembly is arranged at the lower part of the consolidation container; the invention also relates to a working method of the low-stress initial one-dimensional compression-penetration test system. The invention not only has simple and reasonable structural design, but also realizes the compression properties of the low-stress and high-stress soil samples, and can measure the permeability coefficient and the pore water pressure of the soil samples with different stress levels.
Description
Technical Field
The invention relates to a low-stress initial one-dimensional compression-penetration test system and a working method thereof.
Background
In order to maintain the smoothness of the channel and the flood discharge capacity of the river channel, the dredging and dredging engineering of the channel and the river channel is inevitably carried out on a large scale every year in China, so that a large amount of dredged mud is generated. The dredged mud with high water content has large fluidity, the framework is in a flow state, the strength is low, the deformation resistance is poor, and because the natural deposited soil and the dredged mud with high water content have essential difference of fluidity and strength, when a one-dimensional compression test is carried out on the soil sample with high water content, two problems often exist in a conventional test instrument: firstly, the sample cap of the conventional consolidation container is made of metal (about 300g of copper), so that a soil sample with high initial water content overflows a sample preparation cutting ring; secondly, a metal hook (with the mass of about 319 g) of a conventional pressure loading system is applied as a first-stage load, and the soil sample area is 30cm2The load applied to the soil sample was about 12.5kPa, and the initial water content was highFor the soil sample, the soil sample is easy to overflow the sample preparation cutting ring under the pressure.
At present, the large-scale dredged mud treatment mode is to use land nearby, build cofferdams, discharge the waste dredged mud into a storage yard for storage to form a dredged mud storage yard, the permeability coefficient of the dredged mud is a very key technical parameter in the storage yard treatment design, the traditional permeameter cannot carry out a permeability test on the fluid dredged mud, and the traditional consolidation container used in a one-dimensional compression test cannot carry out a permeability test on a soil body after different load actions because the bottom of the traditional consolidation container does not carry out sealing treatment on a drainage channel.
Through the search of the prior art documents, the improvement of automatic pressurization, data acquisition and the like is carried out on a one-dimensional compression test device in recent years, but the test difficulty of the fluid soil cannot be overcome.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a low-stress starting one-dimensional compression-permeation test system and a working method thereof, which are reasonable in structural design, efficient and convenient.
In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides an originated one-dimensional compression-infiltration test system of low stress, includes the test bench, the upper portion of test bench is provided with concreties the container, the upper portion of concreties the container is provided with the biography pressure bolt, pass the pressure bolt and be connected with biography power lever through passing pressure frame, be provided with low stress loading subassembly and high stress loading subassembly on the power lever, the lower part of concreties the container is provided with the flood peak test subassembly.
Furthermore, the consolidation container comprises a base plate, a first permeable stone, a cutting ring, a second permeable stone and a sample cap which are sequentially arranged from bottom to top, a soil sample is contained in the cutting ring, the first permeable stone is arranged in a central groove of the base plate, a first fixed lantern ring is sleeved on the outer side wall of the cutting ring, the first fixed lantern ring is arranged on the outer annular surface of the base plate, a first O-shaped rubber ring is arranged between the first fixed lantern ring and the base plate, a second fixed lantern ring is sleeved on the outer side wall of the second permeable stone, the second fixed lantern ring is arranged on the first fixed lantern ring, a second O-shaped rubber ring is arranged between the second fixed lantern ring and the first fixed lantern ring, a third O-shaped rubber ring is sleeved on the outer side wall of the upper portion of the cutting ring, and the third O-shaped rubber ring is arranged between the cutting ring and the first fixed lantern ring.
Furthermore, a plurality of locking screw rods penetrate through the base plate and the second fixing sleeve ring, the locking screw rods are arranged at intervals in the circumferential direction, one end of each locking screw rod is in threaded connection with the base plate, and the other end of each locking screw rod penetrates through the second fixing sleeve ring and then is locked by a locking nut.
Further, flood peak test component contains flood peak pipe, first water pipe and second water pipe, the flood peak pipe vertically sets up in the one side of consolidation container, first water pipe transversely sets up in the both sides of consolidation container with the second water pipe, the upper end of flood peak pipe is provided with flood peak scale panel, the lower extreme of flood peak pipe inserts the one end of first water pipe through the first flow road junction of three-way valve, second flow road junction, the third flow road junction of three-way valve is connected with pore water pressure gauge, the other end of first water pipe is connected with first permeable stone after passing the chassis, the one end of second water pipe is connected with first permeable stone, the other end of second water pipe is provided with the two-way valve.
Furthermore, the top of passing the pressure bolt is provided with the displacement percentage table, pass the bottom of pressure bolt and press on the top recess of sample cap, pass the pressure frame and contain interconnect's upper portion crossbeam, pass power pull rod and lower part crossbeam, pass the middle part of pressure bolt and be connected with the upper portion crossbeam through the screw thread, the lower part crossbeam is connected with passing the power lever through first hinge.
Further, the low stress loading subassembly contains the low stress weight platform sling, the low stress weight platform sling sets up under biography power pull rod, the high stress loading subassembly contains the high stress weight platform sling, the high stress weight platform sling sets up at one side end of biography power lever.
A method of operating a low stress initiation one-dimensional compression-infiltration testing system, comprising any of the above-described low stress initiation one-dimensional compression-infiltration testing systems, comprising the steps of: the soil sample is subjected to low stress loading through the low stress loading assembly, the force transmission lever and the consolidation container, the soil sample is subjected to high stress loading through the high stress loading assembly, the force transmission lever and the consolidation container, and the permeability coefficient and the pore water pressure of the soil sample with different stress levels can be measured by using the water head testing assembly.
Compared with the prior art, the invention has the following beneficial effects: the invention not only has simple and reasonable structural design, but also realizes the compression properties of the low-stress and medium-high stress soil samples, and can simultaneously measure the permeability coefficients and the pore water pressure of the soil samples with different stress levels.
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Drawings
FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.
FIG. 2 is a schematic front view of a consolidation vessel in accordance with an embodiment of the present invention.
FIG. 3 is a schematic top view of a consolidation vessel according to an embodiment of the present invention.
Fig. 4 is a schematic side view of a pressure transmission frame according to an embodiment of the invention.
In the figure: 1-a test bed, 2-a consolidation container, 201-a chassis, 202-a first permeable stone, 203-a cutting ring, 204-a second permeable stone, 205-a sample cap, 206-a first fixed lantern ring, 207-a first O-shaped rubber ring, 208-a second fixed lantern ring, 209-a second O-shaped rubber ring, 210-a third O-shaped rubber ring, 211-a locking screw, 212-a locking nut, 3-a pressure transfer bolt, 4-a pressure transfer frame, 401-an upper cross beam, 402-a pressure transfer pull rod, 403-a lower cross beam, 5-a lever force transfer, 6-a low stress loading component, 601-a low stress weight hanging disc, 7-a high stress loading component, 701-a high stress weight hanging disc, 8-a water head testing component and 801-a water head pipe, 802-a first water pipe, 803-a second water pipe, 804-a water head graduated scale panel, 805-a three-way valve, 806-a pore water pressure gauge, 807-a two-way valve, 9-a displacement dial indicator, 10-a first hinge, 11-a leveling component, 1101-an adjusting box, 1102-an adjusting hand wheel, 1103-an adjusting screw rod, 1104-an adjusting sleeve, 1105-a balancing screw rod, 1106-a balance weight, 1107-a hook, 12-a second hinge, 13-a leveling instrument, 14-a third hinge, a-a soil sample and b-a stress fulcrum.
Detailed Description
In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.
As shown in fig. 1 to 4, the low-stress initial one-dimensional compression-permeation test system comprises a test bed 1, wherein a consolidation container 2 is arranged at the upper part of the test bed 1, a pressure transfer bolt 3 is arranged at the upper part of the consolidation container 2, the pressure transfer bolt 3 is connected with a force transfer lever 5 through a pressure transfer frame 4, a low-stress loading assembly 6 and a high-stress loading assembly 7 are arranged on the force transfer lever 5, and a water head test assembly 8 is arranged at the lower part of the consolidation container 2.
In the embodiment of the invention, the consolidation container 2 comprises a bottom plate 201, a first permeable stone 202, a cutting ring 203, a second permeable stone 204 and a sample cap 205 which are arranged from bottom to top in sequence, soil samples are contained in the cutting ring 203, the first permeable stone 202 is arranged in a central groove of the chassis 201, the outer side wall of the cutting ring 203 is sleeved with a first fixing ring 206, the first fixing ring 206 is arranged on the outer annular surface of the chassis 201, a first O-shaped rubber ring 207 is arranged between the first fixed lantern ring 206 and the chassis 201, the outer side wall of the second permeable stone 204 is sleeved with a second fixed lantern ring 208, the second fixed lantern ring 208 is arranged on the first fixed lantern ring 206, a second O-shaped rubber ring 209 is arranged between the second fixed lantern ring 208 and the first fixed lantern ring 206, a third O-shaped rubber ring 210 is sleeved on the outer side wall of the upper part of the cutting ring 203, and the third O-shaped rubber ring 210 is arranged between the cutting ring 203 and the first fixing lantern ring 206; the sample cap 205 is made of existing lightweight plexiglass.
In the embodiment of the present invention, a plurality of locking screws 211 penetrate between the chassis 201 and the second fixing collar 208, the plurality of locking screws 211 are circumferentially arranged at intervals, one end of each locking screw 211 is in threaded connection with the chassis 201, and the other end of each locking screw 211 penetrates through the second fixing collar 208 and is locked by a locking nut 212; preferably, the number of the locking screws 211 is three, and the invention realizes that the third O-shaped rubber ring 210 has a sealing effect on the space between the cutting ring 203 and the first fixed lantern ring 206, realizes that the first O-shaped rubber ring 207 has a sealing effect on the space between the chassis 201 and the first fixed lantern ring 206, and realizes that the second O-shaped rubber ring 209 has a sealing effect on the space between the second fixed lantern ring 208 and the third fixed lantern ring by the restraining pressure of the three locking screws 211 and the locking nuts 212, so that the water at the bottom of the consolidation container 2 can only reach the top of the consolidation container 2 through the soil sample inside the cutting ring 203.
In the embodiment of the invention, when the initial state of the soil sample is a plastic soil body, the knife edge of the cutting ring 203 is adopted to vertically and downwards slowly insert the soil body, in the process of pressing down, in order to avoid the cracking of the soil sample, more soil bodies on the outer wall of the cutting ring 203 are required to be gradually removed, finally, the redundant soil bodies on the upper part and the lower part of the cutting ring 203 are planed, and filter paper saturated by degassed water is attached to the upper surface and the lower surface of the soil sample; placing a first permeable stone 202 which is saturated by degassed water into a central groove of a chassis 201, and placing a first O-shaped rubber ring 207 on the outer ring surface of the chassis 201; hooping a third O-shaped rubber ring 210 on the upper part of the cut cutting ring 203, and then sleeving a first fixed lantern ring 206 on the outer part of the cutting ring 203; the second fixed lantern ring 208 is connected with the chassis 201 through three locking screws 211 and locked by the locking nuts 212, so that the first O-shaped rubber ring 207, the second O-shaped rubber ring 209 and the third O-shaped rubber ring 210 between every two rubber rings are pressed to play a sealing role; a second permeable stone 204 and a sample cap 205 are sequentially placed on the top of the soil sample; a first groove for placing a first O-shaped rubber ring 207 is formed in the outer annular surface of the base plate 201, a second groove for placing a second O-shaped rubber ring 209 is formed in the lower surface of the second fixing lantern ring 208, and a third groove for placing a third O-shaped rubber ring 210 is formed in the inner side surface of the first fixing lantern ring 206; the upper part of the first fixing collar 206 and the lower part of the second fixing collar 208 are provided with concave-convex parts for connection.
In the embodiment of the invention, when the initial state of the soil sample is a fluid plastic state soil body, firstly, a first permeable stone 202 which is saturated by degassed water is placed at a central groove of a chassis 201, and a first O-shaped rubber ring 207 is placed on the outer ring surface of the chassis 201; hooping the upper part of the cutting ring 203 with a third O-shaped rubber ring 210, and then sleeving a first fixed lantern ring 206 on the outer part of the cutting ring 203; uniformly stirring the fluidized remolded soil sample, slowly pouring the mixture into a cutting ring 203, lifting and inserting the slurry by using an iron wire in the pouring process to remove air bubbles in the slurry, and scraping the upper surface of the soil sample after the slurry is fully poured; the second fixed lantern ring 208 is connected with the chassis 201 through three locking screws 211 and locked by the locking nuts 212, so that the first O-shaped rubber ring 207, the second O-shaped rubber ring 209 and the third O-shaped rubber ring 210 between every two parts are pressed to play a sealing role; and standing for 24 hours to ensure that the hyperstatic pore water pressure in the fluidized remolded soil sample is dissipated.
In the embodiment of the present invention, the water head testing component 8 includes a water head pipe 801, a first water pipe 802 and a second water pipe, the water head pipe 801 is longitudinally arranged on one side of the consolidation container, the first water pipe 802 and the second water pipe are transversely arranged on both sides of the consolidation container, a water head scale panel 804 is arranged at the upper end of the water head pipe 801, the lower end of the water head pipe 801 is connected to one end of the first water pipe 802 through a first flow passage and a second flow passage of a three-way valve 805, a third flow passage of the three-way valve 805 is connected to a pore water pressure gauge 806, the other end of the first water pipe 802 passes through the chassis 201 and then is connected to the first water permeable stone 202, one end of the second water pipe is connected to the first water permeable stone 202, and the other end of the second water pipe is provided with a two-way valve 807; the waterhead graduated scale panel 804 can be lifted and lowered according to the waterhead height requirement through the connection of pulleys nailed on the wall.
In the embodiment of the invention, a displacement dial indicator 9 is arranged at the top of the pressure transfer bolt 3, the bottom of the pressure transfer bolt 3 is pressed on a groove at the top of the sample cap 205, the pressure transfer frame 4 comprises an upper cross beam 401, a force transfer pull rod 402 and a lower cross beam 403 which are connected with each other, the middle part of the pressure transfer bolt 3 is connected with the upper cross beam 401 through a thread, and the lower cross beam 403 is connected with a force transfer lever 5 through a first hinge 10; measuring the height change of the soil sample through the reading of the displacement dial indicator 9; the first hinge 10 adopts a rhombic cutter pin, and the pressure transfer bolt 3 can be adjusted to be in the upper and lower positions relative to the cross beam 401; the consolidation container 2 is arranged between two force transmission pull rods 402, and the upper cross beam 401, the two force transmission pull rods 402 and the lower cross beam 403 form a square pressure transmission frame 4; and the displacement dial indicator 9 is connected with the test bed 1 through a vertical frame.
In the embodiment of the present invention, the low stress loading component 6 includes a low stress weight hanging scaffold 601, the low stress weight hanging scaffold 601 and the force transmission pull rod 402 are located on the same vertical plane, the high stress loading component 7 includes a high stress weight hanging scaffold 701, and the high stress weight hanging scaffold 701 is arranged at the end of one side of the force transmission lever 5; the weight load on the low-stress weight hanging scaffold 601 is transferred to the sample cap 205 in a 1:1 transfer manner; the load of the sample cap 205 acting on the soil sample is 0.5-12.5 kPa; the weight load on the high-stress weight hanging scaffold 701 is transmitted to the sample cap 205 in a 12:1 transmission mode, and the load of the sample cap 205 acting on the soil sample is 25-1600 kPa.
In the embodiment of the present invention, a leveling component 11 is disposed at the other end of the force transmission lever 5, the leveling component 11 includes an adjusting box 1101 disposed at the lower portion of the test bed 1, a bevel gear pair is disposed inside the adjusting box 1101, a first bevel gear constituting the bevel gear pair is connected to a transversely disposed adjusting handwheel 1102, a second bevel gear constituting the bevel gear pair is connected to a longitudinally disposed adjusting screw 1103, an adjusting rod 1104 is connected to an external thread of the adjusting screw, the adjusting rod 1104 is connected to a stressed fulcrum of the force transmission lever 5 via a second hinge 12, the adjusting rod 1104 is connected to a balance screw 1105 via a third hinge 14, and a balance weight 1106 is connected to a left end thread of the balance screw 1105; the right end of the balance screw 1105 is connected with the center of the lower beam 403 of the pressure transmission frame 4 through a hook 1107, and the second hinge 12 adopts a diamond-shaped knife edge pin; the third hinge 14 adopts a rotating pin; the adjustment hand wheel 1102 is rotated, the first bevel gear adjusts the second bevel gear to rotate, so as to drive the adjustment bolt to rotate, the force transmission lever 5 and the second hinge 12 limit the rotation of the adjustment rod 1104, so as to adjust the relative distance between the adjustment bolt and the adjustment rod 1104, and simultaneously adjust the position of the counter weight 1106, so as to rotate the force transmission lever 5 around the second hinge 12, so as to adjust the balance of the force transmission lever 5 under the condition of no load; of course, the leveling assembly 11 may be directly employed with existing leveling assemblies in single lever consolidators.
In the embodiment of the invention, a leveling instrument 13 is arranged at one end of the force transmission lever 5, and the leveling instrument 13 assists in adjusting the balance of the force transmission lever 5 in the no-load condition.
In an embodiment of the present invention, a working method of a low stress initiation one-dimensional compression-permeation test system, including any one of the above low stress initiation one-dimensional compression-permeation test systems, includes the following steps: the soil sample is subjected to low stress loading through the low stress loading assembly 6, the force transmission lever 5 and the consolidation container, the soil sample is subjected to high stress loading through the high stress loading assembly 7, the force transmission lever 5 and the consolidation container, and the permeability coefficient and the pore water pressure of the soil sample with different stress levels can be measured by using the water head testing assembly 8.
In the embodiment of the invention, a second permeable stone 204 and a sample cap 205 are sequentially placed on the top of a soil sample, a displacement dial indicator 9 is fixed on the top of the sample cap 205, the leveling component 11 is adjusted to enable air bubbles of the level gauge 13 to be in the middle position, and the leveling component 11 is utilized to adjust the balance of the force transmission lever 5 under the condition of no load;
and (3) a low-stress system loading process: when the required load is less than 12.5kPa and more than 0.5kPa, weights are placed on the low-stress weight hanging scaffold 601, and the weight of the weights transmits the load to the sample cap 205 in a 1:1 transmission manner; at the moment, the soil sample bears the vertical consolidation pressure of 0.5-12.5 kPa of the sample cap 205, and deformation data in the soil sample consolidation process are read through a displacement dial indicator 9;
and (3) a high-stress system loading process: when the required load is larger than 12.5kPa, weights are placed on the high-stress weight hanging scaffold 701, the weight transmits the load to the sample cap in a 12:1 transmission mode, at the moment, the soil sample bears the vertical consolidation pressure of 25-1600 kPa of the sample cap 205, and deformation data in the soil sample consolidation process are read through the displacement dial indicator 9.
In the embodiment of the present invention, the pore pressure test process measures the pore water pressure: opening the two-way valve 807, then communicating the three-way valve 805 with the water head pipe 801, and at the moment, separating the three-way valve 805 from the pore water pressure gauge 806 for insulation, and when the two-way valve 807 discharges water and forms continuous water flow, indicating that residual air at the bottom of the sample is exhausted; then, the three-way valve 805 is communicated with the pore water pressure gauge 806, at the moment, the three-way valve 805 is isolated from the water head pipe 801, the two-way valve 807 is closed, and the pore water pressure value is read in the loading process.
In the examples of the present invention, the permeation test procedure measures the permeation coefficient: when the compression deformation of the soil body is stable under each level of load and the pore water pressure is reduced to zero, the three-way valve 805 is communicated with the water head pipe 801, the three-way valve 805 and the pore water pressure gauge 806 are isolated, the two-way valve 807 is closed, the water head pressure of the water head pipe 801 cannot be larger than the vertical load applied to the top of the soil sample, the initial water head height is selected according to the permeability of the soil sample, the requirement of the initial water head height is met through the lifting water head graduated scale panel 804, and then the change of the water head height along with the time is read, so that the permeability coefficient in the current soil body state is obtained.
Terms used in any technical scheme disclosed in the invention for indicating position relation or shape include approximate, similar or close state or shape except for other meanings.
Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.
The above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (3)
1. A low stress initiation one-dimensional compression-infiltration testing system, comprising: the test bed comprises a test bed, wherein a consolidation container is arranged on the upper portion of the test bed, a pressure transfer bolt is arranged on the upper portion of the consolidation container and is connected with a force transfer lever through a pressure transfer frame, a low-stress loading assembly and a high-stress loading assembly are arranged on the force transfer lever, a water head testing assembly is arranged on the lower portion of the consolidation container, the consolidation container comprises a chassis, a first permeable stone, a cutting ring, a second permeable stone and a sample cap which are sequentially arranged from bottom to top, a soil sample is contained in the cutting ring, the first permeable stone is arranged in a central groove of the chassis, a first fixing lantern ring is sleeved on the outer side wall of the cutting ring and is arranged on the outer annular surface of the chassis, a first O-shaped rubber ring is arranged between the first fixing lantern ring and the chassis, a second fixing lantern ring is sleeved on the outer side wall of the second permeable stone, and is arranged on the first fixing lantern ring, be provided with second O style of calligraphy rubber circle between the fixed lantern ring of second and the first fixed lantern ring, the upper portion lateral wall cover of cutting ring is equipped with third O style of calligraphy rubber circle, third O style of calligraphy rubber circle sets up between cutting ring and the first fixed lantern ring, wear to be equipped with a plurality of locking screw between the fixed lantern ring of chassis and second, a plurality of locking screw hoop interval sets up, locking screw's one end and chassis threaded connection, locking screw's the other end utilizes lock nut to lock after passing the fixed lantern ring of second, head test component contains water head pipe, first water pipe and second water pipe, water head pipe vertically sets up in one side of consolidation container, first water pipe and second water pipe transversely set up in the both sides of consolidation container, the upper end of water head pipe is provided with the scale panel, the lower extreme of water head pipe is through the first runner mouth of three-way valve, The one end of first water pipe is inserted to the second flow way mouth, the third flow way mouth of three-way valve is connected with the pore water pressure gauge, the other end of first water pipe is connected with first permeable stone after passing the chassis, the one end of second water pipe is connected with first permeable stone, the other end of second water pipe is provided with the two-way valve, pass the top of pressure bolt and be provided with the displacement percentage table, pass the bottom pressure of pressure bolt on the top recess of sample cap, pass the pressure frame and contain interconnect's upper portion crossbeam, biography power pull rod and lower part crossbeam, pass the middle part of pressure bolt and be connected with the upper portion crossbeam through the screw thread, the lower part crossbeam is connected with biography power lever through first hinge.
2. The low stress initiation one-dimensional compression-infiltration testing system of claim 1, wherein: the low stress loading subassembly contains the low stress weight platform sling, the low stress weight platform sling sets up under biography power pull rod, the high stress loading subassembly contains the high stress weight platform sling, the high stress weight platform sling sets up at one side end of biography power lever.
3. A method of operating a low stress initiation one-dimensional compression-infiltration testing system, using a low stress initiation one-dimensional compression-infiltration testing system according to any of claims 1-2, comprising the steps of: the soil sample is subjected to low stress loading through the low stress loading assembly, the force transmission lever and the consolidation container, the soil sample is subjected to high stress loading through the high stress loading assembly, the force transmission lever and the consolidation container, and the water head testing assembly is used for measuring the permeability coefficient and the pore water pressure of the soil sample at different stress levels.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109682741B (en) * | 2019-02-12 | 2024-02-20 | 郑州大学 | Consolidation penetration test device and operation method thereof |
| CN110608955B (en) * | 2019-10-22 | 2024-06-11 | 中国工程物理研究院化工材料研究所 | Tandem compression loading device for cylindrical samples |
| CN112903383A (en) * | 2021-01-15 | 2021-06-04 | 中国矿业大学(北京) | Preparation device and method of loose particle sample for SHPB (split harmonic vibration suppression) experiment |
| CN115979880B (en) * | 2022-11-25 | 2023-06-20 | 中国矿业大学 | Device and method for testing near-surface soil water retention curve under low-stress environment |
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