Slurry balance shield slurry permeation film forming test device

Abstract

The utility model relates to a mud-water balance shield mud permeation film forming test device which comprises a soil sample cabin, a water filtering layer is arranged on the bottom layer of the soil sample cabin, a mud-water layer is arranged on the top layer of the soil sample cabin, and the soil sample cabin is divided into a plurality of soil sample containing cavities between the water filtering layer and the mud-water layer; the plurality of soil sample accommodating boxes are respectively placed in the soil sample accommodating cavities, each soil sample accommodating box comprises a soil sample accommodating shell which is encircled to form a peripheral supporting structure, pistons are arranged at the left end and the right end of each soil sample accommodating shell, and each soil sample accommodating shell is provided with a plurality of through holes; a plurality of soil sample accommodating mesh bags; the pressurizing devices are used for driving the piston to move towards the middle part of the soil sample accommodating shell, so that the mechanical properties and particle pores of the soil sample to be subjected to the mud film experiment are changed; and the air compressor is connected to the pressurizing hole so as to apply certain pressure to the muddy water layer.

Description

Technical Field

[0001] The utility model relates to the field of film-forming test devices, in particular to a mud-water balance shield mud penetration film-forming test device. Background Art

[0002] Slurry shield construction is the main construction method for tunnels such as urban subways and river crossings. Slurry shield construction refers to the injection of slurry into the sealed compartment of the shield excavation face. The slurry forms an impermeable mud film on the working surface of the shield, which is balanced by the slurry pressurization and external pressure. Ensuring the stability of the excavation face is an important part of slurry shield construction, and its stability is mainly determined by the quality of the mud film formed by the slurry. The quality of the mud film can be reflected by the film thickness, penetration depth, and water filtration. Since many factors such as the underground pressure, geological conditions, and penetration time of the stratum where the slurry shield method is constructed will affect the quality of the mud film formed by the slurry, it is necessary to simulate the penetration process of the slurry in the stratum to obtain the quality parameters of the mud film generated in the excavation environment, and then guide the slurry shield construction process through the quality parameters of the mud film.

[0003] The existing mud permeation film formation test device generally applies driving pressure to the mud under different mud formula conditions to make it penetrate into the soil sample, and then observes the mud water film formation, such as the Chinese application number CN201310205268.4, entitled "Simulation Test Device for Mud Water Shield Mud Film Formation Process". The existing technology does not realize the permeation film formation test of the particle size, particle gap, etc. of the gravel in the stratum.

[0004] The purpose of the present invention is to design a mud-water balance shield mud penetration film forming test device in view of the above-mentioned problems existing in the prior art. Utility Model Content

[0005] In view of the problems existing in the above-mentioned prior art, the utility model provides a mud-water balance shield mud permeability film-forming test device, which can effectively solve at least one problem existing in the above-mentioned prior art.

[0006] The technical solution of the utility model is:

[0007] A mud-water balance shield slurry penetration film forming test device, comprising:

[0008] A soil sample cabin, wherein the bottom layer of the soil sample cabin is provided with a water filter layer, the top layer of the soil sample cabin is provided with a muddy water layer, the soil sample cabin is separated into a plurality of soil sample containing cavities between the water filter layer and the muddy water layer, the top of the soil sample cabin is provided with a pressurizing hole, and the bottom of the soil sample cabin is provided with a water outlet hole;

[0009] A plurality of soil sample containing boxes are respectively placed in the soil sample containing cavity, the soil sample containing box comprises a soil sample containing shell surrounding a surrounding supporting structure, the soil sample containing shell is provided with pistons at both ends thereof, and the soil sample containing shell is provided with a plurality of through holes;

[0010] A plurality of soil sample holding net bags, wherein the soil sample holding net bags are filled with soil samples to be subjected to mud film experiment and then placed in the soil sample holding box;

[0011] A plurality of pressurizing devices are respectively arranged on the left and right sides of the soil sample containing cavity, and the pressurizing devices are used to drive the piston to move toward the middle of the soil sample containing shell, so as to change the mechanical properties and particle pores of the soil sample to be subjected to the mud film test;

[0012] An air compressor is connected to the pressurized hole to apply a certain pressure to the mud and water layer.

[0013] Furthermore, the soil sample holding box is provided with a pore water pressure sensor.

[0014] Furthermore, each of the soil sample containing cavities is provided with a receiving frame on four sides of its bottom, and a door body that can be opened and closed is provided on one side of each of the soil sample containing cavities. The soil sample containing box is placed on the receiving frame, and the door body can seal the corresponding soil sample containing cavity after closing.

[0015] Furthermore, the soil sample containing shell includes a water permeable part and a sealing part, the water permeable part is arranged in the middle part of the soil sample containing shell, the sealing part is arranged at the left and right ends of the soil sample containing shell, the piston is arranged in the sealing part in an interference fit, and the through hole is arranged in the water permeable part.

[0016] Furthermore, both ends of the piston are arranged to have a concave-shaped cross-section, the shell of the pressurizing device is fixedly arranged on the outside of the soil sample chamber, the output shaft of the pressurizing device can extend into the inside of the soil sample chamber, and the output shaft of the pressurizing device is arranged to have a shape matching the cross-section of the piston, and during the process of the soil sample holding box being installed into the soil sample holding cavity, the concave-shaped structure is used to avoid the output shaft.

[0017] Furthermore, the soil sample to be subjected to the mud film experiment is one or more of fine sand, medium sand and coarse sand, the particle size of the fine sand is 0.2-0.4 mm, the particle size of the medium sand is 0.6-0.7 mm, and the particle size of the coarse sand is 2-3 mm.

[0018] Furthermore, the soil sample containing mesh bag has a pore size less than 0.2 mm.

[0019] Furthermore, a control system is included for controlling the pressurization amount of the pressurizing device.

[0020] Therefore, the utility model provides the following effects and / or advantages:

[0021] The mud permeability film-forming test device provided in the present application can select the corresponding soil sample for the mud film test according to the stratigraphic data of the stratum to be tested, and extrude the soil sample for the mud film test through a pressurizing device so that it has a certain stress and forms corresponding particle pores at the same time, thereby matching the geological conditions of the stratum to be tested, and forming the soil sample to be tested for simulating the formation of the mud film.

[0022] The present application realizes shaping of the soil sample to be subjected to the mud film experiment through the cooperation of a soil sample containing box and a soil sample containing mesh bag, so that the soil sample has a certain shape and can be squeezed by a pressurizing device to form a dense or loose structure, thereby controlling the pores of the soil sample to be subjected to the mud film experiment.

[0023] The present application selects fine sand, medium sand and coarse sand as soil samples for mud film experiments and limits the corresponding particle sizes, so as to control the porosity of the soil samples for mud film experiments, and make the formed mud film not only cover the surface of the soil samples, but also penetrate under the soil samples, forming a mud film that can be used in the construction process of mud water shield, which has a better guiding role.

[0024] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by practicing the utility model. The purpose and other advantages of the utility model are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0025] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment of the utility model.

[0027] Figure 2 This is a schematic diagram of the explosion of the soil sample holding box and the soil sample holding net bag structure. DETAILED DESCRIPTION

[0028] In order to facilitate understanding by those skilled in the art, the structure of the present invention is further described in detail with reference to the accompanying drawings:

[0029] refer to Figure 1-2 , a mud-water balance shield mud penetration film forming test device, comprising:

[0030] A soil sample cabin 1, wherein a water filter layer 101 is disposed at the bottom of the soil sample cabin 1, a muddy water layer 102 is disposed at the top of the soil sample cabin 1, a plurality of soil sample accommodating cavities 103 are separated between the water filter layer 101 and the muddy water layer 102, a pressurizing hole (not shown) is disposed at the top of the soil sample cabin 1, and a water outlet hole 104 is disposed at the bottom of the soil sample cabin 1;

[0031] In this embodiment, the soil sample chamber 1 is used to place soil samples between the soil sample holding cavity 103, thereby forming a geological formation similar to that of the slurry shield construction site. The slurry layer 102 is used to add slurry, which can be a slurry formed by mixing slurry particles of a certain particle size with water, and the slurry particles can be bentonite. The water outlet 104 can be used as the water outlet of the soil sample holding cavity 103, and the water permeability coefficient of the soil sample holding cavity 103 can also be measured through the water outlet speed of the water outlet 104, thereby realizing various parameters in the permeable film forming test process.

[0032] A plurality of soil sample containing boxes 2 are respectively placed in the soil sample containing cavity 103, wherein the soil sample containing box 2 comprises a soil sample containing shell 201 surrounding a surrounding supporting structure, wherein the soil sample containing shell 201 is provided with pistons 202 at its left and right ends, and the soil sample containing shell 201 is provided with a plurality of through holes 203;

[0033] In this embodiment, the soil sample containing shell 201 is a cylindrical structure that surrounds the front, rear, left and right sides. By providing a plurality of through holes 203 in the soil sample containing shell 201, water or mud particles can smoothly pass through or reach each soil sample containing cavity 103. In addition, the soil sample containing shell 201 is provided with pistons 202 at its left and right ends, so that a sealing structure can be formed at the left and right ends of the soil sample containing shell 201 to prevent muddy water from leaking from the left and right ends of the soil sample containing shell 201, and the density of the soil sample in the soil sample containing shell 201 can be controlled by squeezing the piston 202.

[0034] A plurality of soil sample containing mesh bags 3, wherein the soil sample containing mesh bags 3 are filled with soil samples to be subjected to mud film experiment and then placed in the soil sample containing box 2;

[0035] In this embodiment, the soil sample holding net bag 3 is a soft and water-permeable net bag, so that the net bag can be formed into various shapes to adapt to the space changes inside the soil sample holding shell 201, and does not hinder mud and water from penetrating into the inside. The soil sample to be subjected to the mud film test is filled in the soil sample holding net bag 3, and the soil sample to be subjected to the mud film test fills the soil sample holding shell 201 without applying pressure, forming an initial state, so that when pressure is subsequently applied to the soil sample holding shell 201 through the piston 202, the soil sample to be subjected to the mud film test inside is always in a filled state.

[0036] A plurality of pressurizing devices 4 are respectively arranged on the left and right sides of the soil sample containing cavity 103, and the pressurizing devices 4 are used to drive the piston 202 to move toward the middle of the soil sample containing shell 201, so as to change the mechanical properties and particle pores of the soil sample to be subjected to the mud film experiment;

[0037] In this embodiment, the arrangement of the pressure device 4, and its cooperation with the piston 202 and the soil sample holding shell 201 are one of the core points of this application. By extending and retracting the pressure device 4, the position of the piston 202 can be controlled, so as to apply a certain pressure to the soil sample to be subjected to the mud film experiment. When the soil sample to be subjected to the mud film experiment is squeezed by the pressure, the structure of the soil sample to be subjected to the mud film experiment becomes denser, and the gap inside it is reduced. At the same time, the soil sample to be subjected to the mud film experiment has a certain stress, which can simulate the actual situation of different strata. For example, for coastal areas, the stratum structure is relatively loose and the gap between geological particles is large. Then, the pressure device 4 can be used to apply a small pressure to the soil sample to be subjected to the mud film experiment inside the soil sample holding box 2, so that the structure of the soil sample to be subjected to the mud film experiment is loose and the pores are large; for mountainous areas below, the stratum structure is relatively dense and the gap between geological particles is small. Then, the pressure device 4 can be used to apply a large pressure to the soil sample to be subjected to the mud film experiment inside the soil sample holding box 2, so that the structure of the soil sample to be subjected to the mud film experiment is dense and the pores are small.

[0038] An air compressor (not shown) is connected to the pressurizing hole to apply a certain pressure to the mud-water layer 102;

[0039] In the present embodiment, since it is necessary to apply a certain pressure to the mud and water during the construction of the mud shield so as to balance the soil and water pressures in front of the construction, the present embodiment increases the air pressure in the mud and water layer 102 by using an air compressor, so that the mud and water can penetrate into the soil sample for the mud film test below under a certain pressure, and form a dense and impermeable mud film on the upper surface of the top soil sample for the mud film test. The mud film is pressurized by the pressure of water and air above the mud film, so as to simulate the balance of soil and water pressures in front of the construction during the construction process, and thus various parameters of the mud film quality, such as the thickness of the mud film, the seepage rate, the mud penetration distance, etc., are obtained during the simulation process. The mud shield construction is guided by the parameters, so that appropriate pressure and appropriate mud are selected during the construction of the mud shield.

[0040] Furthermore, the soil sample holding box 2 is provided with a pore water pressure sensor 204 .

[0041] Furthermore, each of the soil sample containing cavities 103 is provided with a receiving frame 1031 on four sides of its bottom, and a door body 1032 that can be opened and closed is provided on one side of each of the soil sample containing cavities 103. The soil sample containing box is placed on the receiving frame 1031, and the door body 1032 can seal the corresponding soil sample containing cavity 103 after closing.

[0042] In this embodiment, the soil sample receiving chamber 103 can be opened and closed by the door 1032, so that the soil sample receiving box 2 can be easily loaded into the soil sample receiving chamber 103. At the same time, the door 1032 has a sealing function, so that the soil sample receiving chamber 103 can be sealed to prevent water or muddy water from seeping out. The receiving frame 1031 can expose more of the bottom surface of the soil sample receiving box 2, so that the muddy water or water above can flow down smoothly.

[0043] Furthermore, the soil sample containing shell 201 includes a water permeable part and a sealing part, the water permeable part is arranged in the middle part of the soil sample containing shell 201, the sealing part is arranged at the left and right ends of the soil sample containing shell, the piston 202 is arranged in the sealing part in an interference fit, and the through hole 203 is arranged in the water permeable part.

[0044] Furthermore, both ends of the piston 202 are arranged to have a concave-shaped cross-section, the shell of the pressurizing device 4 is fixedly arranged on the outside of the soil sample chamber 1, the output shaft of the pressurizing device 4 can extend into the inside of the soil sample chamber 1, and the output shaft of the pressurizing device 4 is arranged to have a shape matching the cross-section of the piston 202. During the process of the soil sample holding box 2 being loaded into the soil sample holding cavity 103, the concave-shaped structure is used to avoid the output shaft.

[0045] In this embodiment, the pressure device 4 can be one of a gas cylinder, an electric cylinder, etc., which is not limited here. The outer shell of the pressure device 4 is fixed, so that the piston 202 can be driven when the pressure device 4 extends the output shaft. The end of the output shaft is set to a structure with a large outer end and a small inner end that matches the concave structure, so that it can extend into the concave structure along the front or rear of the concave structure and be clamped in the concave structure, so that the piston 202 can move with the output shaft of the pressure device 4.

[0046] Furthermore, the soil sample to be subjected to the mud film experiment is one or more of fine sand, medium sand and coarse sand, the particle size of the fine sand is 0.2-0.4 mm, the particle size of the medium sand is 0.6-0.7 mm, and the particle size of the coarse sand is 2-5 mm.

[0047] In this embodiment, the selected fine sand, medium sand, coarse sand and their corresponding particle sizes have a key influence on the soil sample for the mud film test. When the particle size of the soil sample for the mud film test is too small, it is difficult for the mud particles to penetrate into the soil sample for the mud film test, and only a mud skin is formed on the surface of the soil sample for the mud film test. The mud skin is unstable and easily destroyed. When the particle size of the soil sample for the mud film test is too large, the mud particles are easy to slip along the gaps between the particles of the soil sample for the mud film test to form a permeable layer, but no mud film is formed on the surface of the mud film test soil sample. When the fine sand, medium sand, coarse sand and the corresponding particle size range are within the range provided above, the particles can quickly change their particle pores under the action of external pressure, and can simulate the underground soil structure. At the same time, it can form a mud skin on its upper surface while allowing a part of the mud particles to penetrate below the surface to form a mud film, and the quality temperature of the formed mud film has a good impermeability, so that it can be used for parameter guidance in the mud shield construction process.

[0048] Furthermore, the soil sample containing mesh bag has a pore size less than 0.2 mm.

[0049] Furthermore, a control system is included for controlling the pressurization amount of the pressurizing device.

[0050] It should be noted that in the claims, any reference signs placed between brackets shall not be constructed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claims. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The utility model can be implemented with the aid of hardware comprising several different components and with the aid of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same hardware item. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0051] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0052] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms should not be understood as necessarily being directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

Claims

1. A mud-water balance shield slurry permeation film forming test device, characterized in that: include: A soil sample cabin, wherein the bottom layer of the soil sample cabin is provided with a water filter layer, the top layer of the soil sample cabin is provided with a muddy water layer, the soil sample cabin is separated into a plurality of soil sample containing cavities between the water filter layer and the muddy water layer, the top of the soil sample cabin is provided with a pressurizing hole, and the bottom of the soil sample cabin is provided with a water outlet hole; A plurality of soil sample containing boxes are respectively placed in the soil sample containing cavity, the soil sample containing box comprises a soil sample containing shell surrounding a surrounding supporting structure, the soil sample containing shell is provided with pistons at both ends thereof, and the soil sample containing shell is provided with a plurality of through holes; A plurality of soil sample holding net bags, wherein the soil sample holding net bags are filled with soil samples to be subjected to mud film experiment and then placed in the soil sample holding box; A plurality of pressurizing devices are respectively arranged on the left and right sides of the soil sample containing cavity, and the pressurizing devices are used to drive the piston to move toward the middle of the soil sample containing shell, so as to change the mechanical properties and particle pores of the soil sample to be subjected to the mud film test; An air compressor is connected to the pressurized hole to apply a certain pressure to the mud and water layer.

2. A mud-water balance shield slurry penetration film forming test device according to claim 1, characterized in that: The soil sample containing box is provided with a pore water pressure sensor.

3. The mud water balance shield slurry penetration film forming test device according to claim 1, characterized in that: Each of the soil sample containing cavities is provided with a receiving frame on the four sides of its bottom, and a door body that can be opened and closed is provided on one side of each of the soil sample containing cavities. The soil sample containing box is placed on the receiving frame, and the door body can seal the corresponding soil sample containing cavity after closing.

4. A mud-water balance shield slurry penetration film forming test device according to claim 3, characterized in that: The soil sample containing shell comprises a water permeable part and a sealing part, wherein the water permeable part is arranged in the middle part of the soil sample containing shell, the sealing part is arranged at the left and right ends of the soil sample containing shell, the piston is arranged in the sealing part in an interference fit, and the through hole is arranged in the water permeable part.

5. A mud-water balance shield slurry penetration film forming test device according to claim 4, characterized in that: Both ends of the piston are arranged to have a concave-shaped cross section. The shell of the pressurizing device is fixedly arranged on the outside of the soil sample chamber. The output shaft of the pressurizing device can extend into the inside of the soil sample chamber. The output shaft of the pressurizing device is arranged to have a shape matching the cross section of the piston. During the process of installing the soil sample containing box into the soil sample containing cavity, the concave-shaped structure is used to avoid the output shaft.

6. The mud-water balance shield slurry penetration film forming test device according to claim 1, characterized in that: The soil sample to be subjected to the mud film experiment is one or more of fine sand, medium sand and coarse sand. The particle size of the fine sand is 0.2-0.4 mm, the particle size of the medium sand is 0.6-0.7 mm, and the particle size of the coarse sand is 2-3 mm.

7. A mud-water balance shield slurry penetration film forming test device according to claim 6, characterized in that: The soil sample holding mesh bag has a pore size of less than 0.2 mm.

8. The mud-water balance shield slurry penetration film forming test device according to claim 1, characterized in that: A control system is included for controlling the pressurization amount of the pressurizing device.

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