CN110954673B - Static sounding indoor simulation test method - Google Patents
Static sounding indoor simulation test method Download PDFInfo
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- CN110954673B CN110954673B CN201911213171.1A CN201911213171A CN110954673B CN 110954673 B CN110954673 B CN 110954673B CN 201911213171 A CN201911213171 A CN 201911213171A CN 110954673 B CN110954673 B CN 110954673B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0244—Tests performed "in situ" or after "in situ" use
- G01N2203/0246—Special simulation of "in situ" conditions, scale models or dummies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0298—Manufacturing or preparing specimens
Abstract
The invention discloses a static sounding indoor simulation test method, which belongs to the technical field of static sounding and comprises the following steps: placing a flexible water-stop membrane in a shell, wherein a water cavity is formed between the flexible water-stop membrane and the shell; operating a baffle plate positioned in the water cavity, so that the baffle plate moves along the radial direction of the shell to form a cylindrical cavity, and placing a sample into the flexible water-resisting film; injecting water into the flexible water-stop film, and injecting water into the water cavity and pressurizing at the same time, so that the water pressure in the water cavity is kept to be greater than that in the flexible water-stop film; continuously injecting water into the water cavity and pressurizing, pressurizing the water to a set pressure value, and operating the baffle plate to be far away from the sample along the radial direction of the shell; operating a tray at the lower end of the flexible water-stop film to move vertically upwards so as to solidify the sample in the flexible water-stop film; and operating a penetration assembly arranged above the shell to enable a probe of the penetration assembly to penetrate into the sample along the vertical direction.
Description
Technical Field
The invention relates to the technical field of static sounding, in particular to an indoor simulation test method for static sounding.
Background
The static sounding technology is a field test means which is reliable and common in geotechnical engineering, and the basic principle is that a sounding rod provided with a sounding head is pressed into a test soil layer through mechanical pressure, and the penetration resistance of the soil is measured through a measuring system, so that certain basic physical and mechanical properties of the soil, such as the deformation modulus of the soil, the allowable bearing capacity of the soil and the like, can be determined. Regression analysis is carried out on penetration resistance obtained by static sounding and related indexes in a load test and a soil test, and an empirical formula suitable for a certain area or a certain soil property can be obtained.
In the static sounding technology, test data need to realize engineering geological exploration purposes of acquiring a soil layer profile, providing shallow foundation bearing capacity, selecting a pile end bearing layer, predicting single pile bearing capacity and the like according to qualitative relation and statistical correlation between penetration resistance and engineering geological characteristics of soil.
In order to achieve a better data analysis effect, an indoor simulation test device is often used for a static sounding penetration test. In the test process, different measurement data are obtained by controlling soil layer parameters such as different pore ratios and different consolidation pressures. However, the existing indoor simulation test device cannot simulate the real stress state of soil under the stratum, namely the consolidation characteristic of the soil under the initial anisotropy condition, so that the accuracy of the test result is reduced.
Disclosure of Invention
The invention aims to provide a static sounding indoor simulation test method to solve the technical problem that the consolidation characteristic of soil under the initial anisotropic condition cannot be simulated in the prior art.
As the conception, the technical scheme adopted by the invention is as follows:
a static sounding indoor simulation test method comprises the following steps:
s1: placing a flexible water-stop membrane in a shell, wherein a water cavity is formed between the flexible water-stop membrane and the shell;
s2: operating a baffle plate positioned in the water cavity, so that the baffle plate moves along the radial direction of the shell to form a cylindrical cavity, and placing a sample into the flexible water-resisting film;
s3: injecting water into the flexible water-stop film, injecting water into the water cavity and pressurizing at the same time, and keeping the water pressure in the water cavity to be greater than the water pressure in the flexible water-stop film;
s4: continuously injecting water into the water cavity and pressurizing, pressurizing the water to a set pressure value, and operating the baffle plate to be far away from the sample along the radial direction of the shell; operating a tray at the lower end of the flexible water-stop film to move vertically upwards so as to solidify the sample in the flexible water-stop film;
s5: and operating a penetration assembly arranged above the shell to enable a probe of the penetration assembly to penetrate into the sample along the vertical direction.
The shell is of a split structure and comprises a cylinder body, an upper end cover arranged at the top end of the cylinder body and a lower end cover arranged at the bottom end of the cylinder body, and the flexible waterproof membrane is cylindrical;
in S1, the upper end edge of the flexible waterproof film is fixedly connected to the cylinder, the lower end edge of the flexible waterproof film is fixedly connected to the tray, the tray is located in the cylinder, and a water cavity is formed between the flexible waterproof film and the shell.
The cylinder body is provided with a first power mechanism, and the output end of the first power mechanism is fixedly connected with the baffle; in S2, the baffle is driven by the first power mechanism to move along the radial direction of the cylinder.
The number of the baffle plates is three, the baffle plates are arc-shaped, and the three baffle plates can move synchronously along the radial direction of the cylinder body to form a cylindrical cavity in a surrounding mode.
In S2, after placing the test sample in the flexible water-stop membrane, fixedly connecting the upper end cap to the cylinder, so that the probe of the sounding assembly passes through the upper end cap and is located in the flexible water-stop membrane.
The tray is provided with a first water inlet hole communicated with the inner cavity of the flexible water-stop film, the lower end cover is provided with a second water inlet hole, and the first water inlet hole is communicated with the second water inlet hole through a pipeline; and in S3, injecting water into the flexible water-stop film through the second water inlet hole and the first water inlet hole, and detecting the water pressure value in the flexible water-stop film.
Wherein, a water inlet and a water outlet which are communicated with the water cavity are arranged on the cylinder body; in S3, the water outlet is closed, water is injected into the water cavity through the water inlet, and a water pressure value in the water cavity is detected, so that the water pressure in the water cavity is greater than the water pressure in the flexible water-stop membrane.
The lower end cover is provided with a second power mechanism, and the output end of the second power mechanism is fixedly connected with the tray; in S4, the tray is driven to move vertically upward by the second power mechanism.
The tray is provided with a first drainage hole communicated with the inner cavity of the flexible waterproof membrane, the lower end cover is provided with a second drainage hole, and the first drainage hole is communicated with the second drainage hole through a pipeline; the upper end cover is provided with an upper drainage hole communicated with the inner cavity of the flexible waterproof membrane; in S4, the tray is moved in a vertical direction to consolidate the test pieces, and water in the test pieces flows out from the upper drain hole and the first drain hole.
Wherein, after S5, the method further comprises:
operating the tray to move downwards along a vertical direction;
draining water from the water chamber;
the probe operating the feeler assembly is moved upward in a vertical direction.
The invention has the beneficial effects that:
the invention provides a static sounding indoor simulation test method, which comprises the steps of arranging a flexible water-stop film in a shell, moving a baffle plate positioned between the shell and the flexible water-stop film along the radial direction of the shell to form a cylindrical cavity, containing a sample in the flexible water-stop film, forming the sample into a cylinder, and forming a water cavity between the flexible water-stop film and the shell; operating a tray at the lower end of the flexible water-stop film to move vertically upwards so as to solidify the sample in the flexible water-stop film; by controlling the pressure of water in the water cavity and the vertical force applied by the tray, the stress state of soil under a real stratum under various working conditions can be simulated, including but not limited to the consolidation characteristic of the soil under the initial anisotropic condition and the compression characteristic of the soil under the isotropic consolidation condition, and meanwhile, the prepared sample is kept uniform and saturated, so that the measurement result is more consistent. And (3) performing a static force penetration test and an indoor conventional mechanical test under different consolidation conditions, thereby providing technical support for interpretation of field test data.
Drawings
FIG. 1 is a schematic diagram of a static sounding room simulation test device provided by an embodiment of the invention in a sample forming state;
FIG. 2 is a schematic diagram of a simulation test device in a static sounding chamber in a sample consolidation state according to an embodiment of the present invention.
In the figure:
11. a barrel; 111. a water inlet; 112. a water outlet; 12. an upper end cover; 121. an upper drainage hole; 13. a lower end cover; 131. a second water inlet hole; 132. a second drain hole;
21. a flexible water-barrier film; 22. a water chamber;
31. a baffle plate; 32. a first power mechanism;
41. a tray; 411. a first water inlet hole; 412. a first drain hole; 42. a second power mechanism;
51. a probe; 52. a probe rod; 53. a drive mechanism; 54. a support frame;
6. and (4) supporting the base.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Referring to fig. 1 and 2, an embodiment of the present invention provides a static sounding indoor simulation test apparatus, which can be used for forming a sample, simulating a stress state of soil under a real stratum under various working conditions, applying a consolidation force to the sample, and performing static sounding on the sample, and is described in detail below.
Static sounding indoor simulation testing arrangement includes the shell, sets up flexible water-stop film 21 and tray 41 in the shell, and the upper end and the shell fixed connection of flexible water-stop film 21 can hold the sample in the flexible water-stop film 21, form water cavity 22 between flexible water-stop film 21 and the shell, the lower extreme and the tray 41 fixed connection of flexible water-stop film 21. In this embodiment, the housing is a cylinder. Because the sample of cylinder atress is more even, has less stress, consequently chooses the shell of cylinder to the sample of shaping cylinder.
The shell is the components of a whole that can function independently structure, including barrel 11, upper end cap 12 and lower end cap 13, and the both ends of barrel 11 all have the opening, and upper end cap 12 sets up in the top of barrel 11, can shutoff barrel 11's upper end opening, and lower end cap 13 sets up in the bottom of barrel 11, can shutoff barrel 11's lower extreme opening. Sealing rings are arranged between the upper end cover 12 and the cylinder body 11 and between the lower end cover 13 and the cylinder body 11.
The flexible water-stop film 21 is cylindrical, and the upper end of the flexible water-stop film 21 is fixedly connected with the cylinder 11. Specifically, a boss is annularly arranged on the inner wall of the cylinder 11, and the upper end edge of the flexible water-stop film 21 is fixedly connected with the boss. Be provided with first flange on the boss, the upper end edge of flexible water stop membrane 21 presss from both sides and locates between boss and the first flange for the upper end edge of flexible water stop membrane 21 is fixed. The tray 41 is provided with a second flange, and the lower end edge of the flexible water-stop film 21 is clamped between the tray 41 and the second flange, so that the lower end edge of the flexible water-stop film 21 is fixed. Sealing rings are arranged between the boss and the first flange and between the tray 41 and the second flange.
At least two baffles 31 are arranged between the flexible water-stop film 21 and the shell, and the baffles 31 can move along the radial direction of the shell to enclose a cylindrical cavity. That is, the baffle 31 is disposed within the water chamber 22. When the test device is used, all the baffles 31 are synchronously moved, the edges of the adjacent baffles 31 are contacted to form a cylindrical cavity, the flexible water-stop film 21 is positioned in the cylindrical cavity, and due to the matching of the tray 41 and the baffles 31, after a sample is placed in the flexible water-stop film 21, the sample can be formed into a cylinder.
In the embodiment, three baffles 31 are provided, the baffles 31 are circular arc-shaped, and the three baffles 31 can synchronously move along the radial direction of the shell to enclose a cylindrical cavity. The included angle between the adjacent baffles 31 is 120 degrees, each baffle 31 is 1/3 circular arcs, and three baffles 31 form a complete circle. Of course, the number of the baffles 31 can be determined according to actual needs, and can be two, four or other numbers.
The static sounding indoor simulation test device further comprises a first power mechanism 32, the first power mechanism 32 is fixedly connected with the shell, and the output end of the first power mechanism 32 is fixedly connected with the baffle 31. The first power mechanism 32 can be a cylinder, an oil cylinder or a matching structure of a motor and a screw rod, as long as the baffle 31 can be driven to move linearly.
In this embodiment, the first power mechanism 32 is an oil cylinder, an output end of the oil cylinder penetrates through the cylinder 11 and is connected with the baffle 31, and a sealing ring is arranged between the output end of the oil cylinder and the cylinder 11. Baffle 31 mainly adopts frame-type structure, and the stainless steel of certain thickness all adopts around baffle 31, and the junction of baffle 31 and the piston of hydro-cylinder also adopts the stainless steel strengthening rib.
The purpose achieved by the combination mode of the oil cylinder and the baffle plate 31 is as follows: the diameter of the sample is kept from being changed greatly in the sample preparation process.
In this embodiment, two sets of first power mechanisms 32 are disposed corresponding to each baffle 31, and the two sets of first power mechanisms 32 are arranged at intervals along the axial direction of the barrel 11, so that the baffles 31 operate stably and are stressed in a balanced manner.
All the first power mechanisms 32 can be connected in series through oil pipes and connected with a manual hydraulic oil source to ensure synchronism. When the hydraulic oil source is pressurized, the pistons of all the oil cylinders move towards the sample direction, and meanwhile, the baffle plate 31 is pushed to move towards the center until the maximum stroke of the pistons is reached. Three baffles 31 are arranged to be closely coupled when the piston is at its maximum stroke, and depending on the size of the baffles 31, a cylinder of the same diameter as the desired sample can be formed. This limits lateral deformation during sample preparation. When the hydraulic oil source is removed, the baffle 31 is pushed to move outwards once the internal pressure is outwards due to the lack of inwards pressure.
The tray 41 can be moved upward in the vertical direction to consolidate the sample in the flexible water-stop film 21. Tray 41 plays the supporting role to the bottom of sample for the sample receives vertical ascending pressure owing to tray 41's removal simultaneously, and then makes the sample solidify. During the movement of the tray 41, the sample is deformed to some extent.
In order to prevent the shutter 31 from interfering with the movement of the tray 41, the shutter 31 may be controlled by the first power mechanism 32 to be spaced apart from the sample in the radial direction of the housing until the movement space of the tray 41 is avoided before the tray 41 moves.
The indoor simulation test device for the static sounding further comprises a second power mechanism 42, the second power mechanism 42 is fixedly connected with the shell, and an output end of the second power mechanism 42 is connected with the bottom end of the tray 41 to drive the tray 41 to move in the vertical direction. The second power mechanism 42 may be a cylinder, an oil cylinder, or a matching structure of a motor and a lead screw, as long as the tray 41 can be driven to move linearly. In this embodiment, the second power mechanism 42 is an oil cylinder, an output end of the oil cylinder penetrates through the lower end cover 13 to be connected with the tray 41, and a sealing ring is arranged between the output end of the oil cylinder and the lower end cover 13.
Because the flexible water stop film 21 is a flexible member and has certain elasticity, the flexible water stop film 21 does not apply external force to the sample. To prevent the sample from deforming under its own weight when the baffle 31 is away from the sample, water is injected into the water chamber 22 and pressurized to a set value to provide support around the sample before the baffle 31 is away from the sample.
When the radial force of the water in the water chamber 22 on the sample is equal to the axial force of the tray 41 on the sample, the sample is in an isotropic condition. By changing the acting force of the water in the water cavity 22 or the acting force of the tray 41, the sample can be in the condition of anisotropy, and further the stress state of the soil under the real stratum under various working conditions can be simulated.
The cylinder 11 of the housing is provided with a water inlet 111 and a water outlet 112 which are communicated with the water cavity 22. Water is injected into the water chamber 22 through the water inlet 111, and the water outlet 112 is in a closed state. When the test is completed, the water outlet 112 is opened and drainage can be performed.
Set up the first inlet opening 411 with the inner chamber intercommunication of flexible water-stop film 21 on the tray 41, seted up second inlet opening 131 on the lower end cover 13, communicate through the pipeline between first inlet opening 411 and the second inlet opening 131. The sample needs to be saturated before it is consolidated. Through the water injection of second inlet opening 131, water passes through the pipeline, the sample in the flexible water proof membrane 21 of first inlet opening 411 entering for gas in the sample dissolves in aquatic, and then realizes the saturation to the sample.
The tray 41 is provided with a first drainage hole 412 communicated with the inner cavity of the flexible water-stop film 21, the lower end cover 13 is provided with a second drainage hole 132, and the first drainage hole 412 is communicated with the second drainage hole 132 through a pipeline. When the sample is solidified, the sample is squeezed, and water in the sample is discharged and flows out through the first drain hole 412, the pipeline and the second drain hole 132.
An upper drainage hole 121 communicated with the inner cavity of the flexible water-stop film 21 is formed in the upper end cover 12, so that water at the upper end of the sample can flow out through the upper drainage hole 121 in the upper end cover 12.
In order to avoid the loss of the sample, the first water inlet 411, the first water outlet 412 and the upper water outlet 121 are all disposed on the permeable stone.
The indoor simulation test device for the static sounding further comprises a sounding assembly, the sounding assembly is arranged above the shell, and a probe 51 of the sounding assembly can penetrate into a sample along the vertical direction. After the sample is consolidated, the hydrostatic parameters can be measured by vertically penetrating the probe 51 of the feeler assembly into the sample.
The sounding assembly comprises a probe rod 52, a probe 51 is arranged at one end of the probe rod 52, a driving mechanism 53 is arranged at the other end of the probe rod 52, a supporting frame 54 is arranged on the upper end cover 12, and the driving mechanism 53 is connected with the supporting frame 54. The driving mechanism 53 may be a cylinder, an oil cylinder, or a matching structure of a motor and a lead screw, as long as the probe rod 52 can be driven to move linearly. In this embodiment, the driving mechanism 53 is a cylinder, and an output end of the cylinder is connected to the probe 52.
The upper end cover 12 is provided with a penetration hole for penetrating the sounding component, the probe rod 52 penetrates the penetration hole, and the probe rod 52 and the upper end cover 12 are sealed by a sealing ring.
Of course, in order to provide support for the shell, the static sounding indoor simulation test device further comprises a support seat 6, and the support seat 6 is annular and is connected with the lower end cover 13 to play a role in uniform support. The second power mechanism 42 is located in the middle of the support base 6 to fully utilize the space. In order to facilitate acquisition of measurement data, the static sounding indoor simulation test device further comprises a data acquisition instrument electrically connected with the sounding assembly, which is not described herein again, and reference can be made to the prior art.
The embodiment of the invention also provides a static sounding indoor simulation test method, which comprises the following steps:
s1: placing a flexible water-stop film 21 in the shell, and forming a water cavity 22 between the flexible water-stop film 21 and the shell;
s1 is a preparation stage of the apparatus, including:
a second power mechanism 42 is arranged on the lower end cover 13, the lower end edge of the flexible water-stop film 21 is connected with the tray 41, and the tray 41 is connected with the second power mechanism 42;
installing a first power mechanism 32 and a baffle 31 on the cylinder 11, and connecting the cylinder 11 with the lower end cover 13 to enable the tray 41 and the flexible water-stop film 21 to be positioned in the cylinder 11;
the upper end edge of the flexible water-stop film 21 is fixedly connected with the cylinder 11, and a water cavity 22 is formed between the flexible water-stop film 21 and the shell.
S2: operating the baffle 31 in the water cavity 22, so that the baffle 31 moves along the radial direction of the shell to form a cylindrical cavity, and placing the sample into the flexible water-stop film 21;
s2, i.e., a sample forming stage, comprising:
the baffle 31 is driven by the first power mechanism 32 to move along the radial direction of the barrel 11, so that the three baffles 31 move synchronously to enclose a cylindrical cavity, and at this time, the tray 41 is located at the bottom end of the baffle 31 to form the bottom of the cylindrical cavity.
The sample is placed in the flexible water-stop membrane 21 and is slurry or loose sand, and due to the looseness of the sample and the small rigidity of the flexible water-stop membrane 21, if the sample is not limited, the filled sample can be laterally extruded and collapsed, so that the preparation quality of the sample is influenced, and if the sample is serious, the further development of the test is prevented. The baffle 31 can therefore limit lateral deformation of the sample during filling.
After the sample is filled, the upper end cap 12 is connected to the cylinder 11 to seal the sample, and the probe 51 of the sounding assembly is positioned in the flexible water-stop film 21 through the upper end cap 12.
S3: injecting water into the flexible water-stop film 21, injecting water into the water cavity 22 and pressurizing at the same time, and keeping the water pressure in the water cavity 22 to be greater than the water pressure in the flexible water-stop film 21;
s3, sample saturation stage, comprising:
injecting water into the flexible water-stop film 21 through the second water inlet hole 131 and the first water inlet hole 411, and detecting the water pressure value in the flexible water-stop film 21;
the water outlet 112 on the cylinder 11 is closed, water is injected into the water cavity 22 through the water inlet 111 on the cylinder 11, and the water pressure value in the water cavity 22 is detected, so that the water pressure in the water cavity 22 is slightly higher than the water pressure in the flexible water-stop film 21, and the gas in the sample is dissolved in the water.
S4: continuing to inject water into the water cavity 22 and pressurizing the water to a set pressure value, and operating the baffle 31 to be far away from the sample along the radial direction of the shell;
s4, consolidation sample stage, comprising:
pressurizing the water in the water chamber 22 to the set pressure value takes advantage of the isotropic nature of the water to apply additional force through the tray 41 at the bottom to achieve the set stress state where the baffle 31 can be moved away from the sample due to the force of the water without the sample collapsing.
The tray 41 is driven by the second power mechanism 42 to move vertically and upwards so as to solidify the sample in the flexible water-stop film 21, water in the sample flows out from the upper water discharge hole 121 of the upper end cover 12 and the first water discharge hole 412 on the tray 41, and at this time, the flexible water-stop film 21 produces water to deform to a certain degree.
S5: the feeler assembly, which is disposed above the housing, is operated so that the probe 51 of the feeler assembly penetrates the sample in a vertical direction.
The penetration test stage is performed at S5, and the penetration speed can be implemented according to a set value, which is not described herein again.
After the test is completed, the tray 41 at the lower end of the flexible water-stop film 21 is operated to move vertically downward while draining the water in the water chamber 22, and the probe 51 of the sounding assembly is operated to move vertically upward.
Arranging a flexible water-stop film 21 in a shell, moving a baffle plate 31 positioned between the shell and the flexible water-stop film 21 along the radial direction of the shell to form a cylindrical cavity, placing a sample in the flexible water-stop film 21, forming the sample into a cylinder, and forming a water cavity 22 between the flexible water-stop film 21 and the shell; the tray 41 at the lower end of the flexible water-stop film 21 is operated to move vertically upwards so as to solidify the sample in the flexible water-stop film 21; by controlling the pressure of the water in the water cavity 22 and the vertical force applied by the tray 41, the stress state of the soil under the real stratum under various working conditions can be simulated, including but not limited to the consolidation characteristic of the soil under the initial anisotropic condition and the compression characteristic of the soil under the isotropic consolidation condition, and meanwhile, the prepared sample is kept uniform and saturated, so that the measurement result is more consistent and closer to the real data. And (3) performing a static force penetration test and an indoor conventional mechanical test under different consolidation conditions, thereby providing technical support for interpretation of field test data.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the invention, which changes and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A static sounding indoor simulation test method is characterized by comprising the following steps:
s1: placing a flexible water-stop membrane (21) in a housing, a water cavity (22) being formed between the flexible water-stop membrane (21) and the housing;
s2: operating a baffle (31) positioned in the water cavity (22) so that the baffle (31) moves along the radial direction of the shell to form a cylindrical cavity, and placing a sample into the flexible water-stop film (21);
s3: injecting water into the flexible water-stop film (21), and simultaneously injecting water into the water cavity (22) and pressurizing, so as to keep the water pressure in the water cavity (22) larger than the water pressure in the flexible water-stop film (21);
s4: continuing to inject water into the water cavity (22) and pressurizing, pressurizing the water to a set pressure value, and operating the baffle (31) to be far away from the sample along the radial direction of the shell; operating a tray (41) at the lower end of the flexible water-stop film (21) to move vertically upwards to solidify the sample in the flexible water-stop film (21);
s5: and operating a penetration assembly arranged above the shell to enable a probe (51) of the penetration assembly to penetrate into the sample along the vertical direction.
2. A static sounding indoor simulation test method according to claim 1, wherein the casing is of a split structure and comprises a cylinder (11), an upper end cover (12) arranged at the top end of the cylinder (11) and a lower end cover (13) arranged at the bottom end of the cylinder (11), and the flexible water-stop membrane (21) is cylindrical;
in S1, the upper end edge of the flexible water-stop film (21) is fixedly connected with the cylinder body (11), the lower end edge of the flexible water-stop film (21) is fixedly connected with the tray (41), the tray (41) is located in the cylinder body (11), and a water cavity (22) is formed between the flexible water-stop film (21) and the shell.
3. A static sounding indoor simulation test method according to claim 2, wherein a first power mechanism (32) is arranged on the cylinder (11), and an output end of the first power mechanism (32) is fixedly connected with the baffle (31);
in S2, the baffle (31) is driven by the first power mechanism (32) to move along the radial direction of the cylinder (11).
4. A static sounding indoor simulation test method according to claim 3, wherein the number of the baffles (31) is three, the baffles (31) are arc-shaped, and the three baffles (31) can synchronously move along the radial direction of the cylinder (11) to form a cylindrical cavity.
5. A static sounding chamber internal simulation test method according to claim 2, characterized in that, in S2, after placing a test sample into the flexible water-stop membrane (21), the upper end cap (12) is fixedly connected with the cylinder (11) so that the probe (51) of the sounding assembly passes through the upper end cap (12) and is located in the flexible water-stop membrane (21).
6. A static sounding indoor simulation test method according to claim 2, wherein the tray (41) is provided with a first water inlet hole (411) communicated with an inner cavity of the flexible water-stop membrane (21), the lower end cover (13) is provided with a second water inlet hole (131), and the first water inlet hole (411) is communicated with the second water inlet hole (131) through a pipeline;
in S3, water is injected into the flexible water-stop membrane (21) through the second water inlet hole (131) and the first water inlet hole (411), and a water pressure value in the flexible water-stop membrane (21) is detected.
7. A static sounding indoor simulation test method according to claim 6, wherein the barrel (11) is provided with a water inlet (111) and a water outlet (112) which are communicated with the water cavity (22);
in S3, the water outlet (112) is closed, water is injected into the water cavity (22) through the water inlet (111), and the water pressure value in the water cavity (22) is detected, so that the water pressure in the water cavity (22) is greater than the water pressure in the flexible water-stop membrane (21).
8. A static sounding indoor simulation test method according to claim 6, characterized in that a second power mechanism (42) is arranged on the lower end cover (13), and the output end of the second power mechanism (42) is fixedly connected with the tray (41);
in S4, the tray (41) is driven to move vertically upward by the second power mechanism (42).
9. A static sounding indoor simulation test method according to claim 8, wherein the tray (41) is provided with a first drain hole (412) communicated with the inner cavity of the flexible water-stop film (21), the lower end cover (13) is provided with a second drain hole (132), and the first drain hole (412) is communicated with the second drain hole (132) through a pipeline;
an upper drainage hole (121) communicated with the inner cavity of the flexible water-stop film (21) is formed in the upper end cover (12);
in S4, the tray (41) is moved in a vertical direction to consolidate the sample, and water in the sample flows out from the upper drain hole (121) and the first drain hole (412).
10. A static sounding chamber simulation test method according to any one of claims 1 to 9, further comprising, after S5:
operating the tray (41) to move downward in a vertical direction;
-draining the water in the water chamber (22);
the probe (51) operating the feeler assembly is moved upwards in a vertical direction.
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| CN112942292A (en) * | 2021-02-03 | 2021-06-11 | 中国海洋大学 | Small-volume calibration tank for seabed soil static sounding test |
| CN115639079B (en) * | 2022-11-04 | 2023-10-20 | 湖北顶华工程勘察设计有限公司 | Static cone penetration test system and method for restoring soil body site state indoors |
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| CN105527175A (en) * | 2016-01-22 | 2016-04-27 | 湘潭大学 | Soil engineering triaxial shear test equipment based on MTS electro-hydraulic servo tester |
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