Permeation test device for improved saline soil

Abstract

The utility model relates to the technical field of improved saline soil penetration test, in particular to an improved saline soil penetration test device which comprises a penetration cylinder and a limiting ring arranged at the bottom of the inner circumferential surface of the penetration cylinder, the penetration cylinder comprises a plurality of cylinder bodies, and a blocking part is arranged between every two adjacent cylinder bodies; the blocking part comprises an annular accommodating chamber and an elastic inner wall, the elastic inner wall is an inner ring wall of the annular accommodating chamber, and the elastic inner wall is flush with the inner peripheral wall of the permeation cylinder; each blocking part is correspondingly provided with a pressurizing part, fluid is contained in a containing cavity in the pressurizing part and the annular containing chamber, and the containing cavity is communicated with the annular containing chamber; a piston is arranged in the containing cavity, the piston is pushed to move forwards, fluid in the containing cavity can enter the annular containing chamber, and at least part of the elastic inner wall protrudes out of the inner circumferential wall of the permeation cylinder. According to the utility model, the side wall leakage in the penetration test process can be effectively prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of improvement saline soil permeation test, concretely to a kind of improvement saline soil's permeation test device. BACKGROUND

[0002] Permeability is an important engineering property of soil, which determines the strength properties and deformation, consolidation properties of soil. There are various ways to improve saline soil, and the improved saline soil obtained by different improvement methods has different soil properties. For example, the soil of saline soil improved by mixing coarse-grained soil is relatively loose, while the soil of improved saline soil obtained by cement improvement is relatively hard. Different permeation test methods need to be used for improved saline soil with different soil properties. Common permeation test methods include constant head test and variable head test. Among them, the constant head test is suitable for improved saline soil with relatively loose soil, while the variable head test is suitable for improved saline soil with relatively hard soil. In both test methods, the improved saline soil to be tested is loaded into the inside of the permeation cylinder, then water is injected into the top of the improved saline soil, and the relevant parameters are adjusted to carry out the permeation test.

[0003] The problem existing in the test process is that water is easy to leak from the gap between the improved saline soil and the inner wall of the permeation cylinder (or called side wall leakage). The main reasons for this leakage include: 1. There may be small cracks, pores or loose connections in the side wall of the test device, which may cause side wall leakage during the permeation test; 2. Improper sealing between the sample and the test device, such as aging of the sealing material, damage of the sealing pad or improper installation, etc., which may cause side wall leakage; such side wall leakage will cause inaccurate experimental results. UTILITY MODEL CONTENTS

[0004] The utility model aims to provide a kind of improved saline soil's permeation test device to solve the problems raised in the above background.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme: a kind of improved saline soil's permeation test device, including permeation cylinder and the limiting ring being set in the bottom of the inner circumferential surface of permeation cylinder, the permeation cylinder includes several cylinder bodies, and the blocking component is arranged between the two adjacent cylinder bodies;

[0006] The blocking component includes an annular receiving chamber and an elastic inner wall, the elastic inner wall is the inner ring wall of the annular receiving chamber, and the elastic inner wall is flush with the inner circumferential wall of the permeation cylinder;

[0007] Each blocking component is correspondingly provided with one booster component, the receiving cavity inside the booster component and the annular receiving chamber both contain fluid, and the receiving cavity is communicated with the annular receiving chamber;

[0008] The accommodating cavity is internally provided with a piston, fluid in the accommodating cavity can enter the annular accommodating chamber by pushing the piston forward, and the elastic inner wall is at least partially protruded from the inner circumferential wall of the permeation cylinder.

[0009] Preferably, the blocking component further comprises an annular outer wall and two sealing walls, the two sealing walls are integrally arranged at the upper and lower ends of the elastic inner wall respectively, the annular outer wall is arranged between the two sealing walls, and the elastic inner wall, the annular outer wall and the two sealing walls cooperatively form the annular accommodating chamber.

[0010] Preferably, the blocking component further comprises a fixing ring, the fixing ring is fixedly connected with the cylinder body, and the annular outer wall is fixedly connected with the fixing ring through a fastener.

[0011] Preferably, the fastener is a bolt.

[0012] Preferably, the elastic inner wall and the sealing wall are both made of rubber.

[0013] Preferably, the pressure increasing component further comprises an accommodating pipe, a communicating pipe, a nut and a screw rod.

[0014] The nut is coaxially fixedly connected with the accommodating pipe, and a gap is reserved between the nut and the accommodating pipe.

[0015] The accommodating pipe, the piston and the communicating pipe jointly form an accommodating cavity.

[0016] The communicating pipe is communicated between the accommodating cavity and the annular accommodating chamber.

[0017] The screw rod is threadedly connected with the nut, and one end of the screw rod is rotationally connected with the piston.

[0018] Preferably, the other end of the screw rod is fixedly connected with a handle.

[0019] Compared with the prior art, the utility model has the beneficial effects that:

[0020] In normal state, the elastic inner wall is flush with the inner circumferential wall of the permeation cylinder, so that the elastic inner wall does not block the installation of the metal hole plate for supporting the improved saline soil, the metal hole plate can be smoothly placed on the limiting ring, and after the improved saline soil is filled, the piston is directly pushed forward to extrude the fluid originally in the accommodating cavity into the annular accommodating chamber, the fluid pressure in the annular accommodating chamber is increased, and under the action of the pressure, the elastic inner wall is gradually protruded from the inner wall surface of the cylinder body due to the elasticity of the elastic inner wall, so that the inner circumferential surface of the elastic inner wall can extrude the improved saline soil, the sealing connection between the elastic inner wall and the improved saline soil is realized, and thus the leakage of the side wall can be prevented. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is the whole structure schematic view of the utility model;

[0022] Figure 2 It is the sectional view three-dimensional structure schematic view of the utility model;

[0023] Figure 3 It is the whole structure schematic view of the utility model Figure 2 It is the enlarged structure schematic view of A place in the utility model;

[0024] Figure 4 It is the whole structure schematic view of the utility model Figure 2 It is the enlarged structure schematic view of B place in the utility model.

[0025] In the drawing: 1, permeation cylinder;11, cylinder body;12, limit ring;2, blocking component;21, annular accommodating chamber;22, elastic inner wall;23, sealing wall;24, annular outer wall;25, bolt;26, fixing ring;3, booster component;31, accommodating pipe;32, accommodating cavity;33, communication pipe;34, piston;35, nut;36, screw rod;37, handle. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the utility model.

[0027] Please refer to Figures 1-4 The utility model provides a technical scheme:

[0028] A kind of improved saline soil's permeation test device, including permeation cylinder 1 and the limit ring 12 of being arranged at the bottom of the inner circumferential surface of permeation cylinder 1, wherein the permeation cylinder 1 is used to contain improved saline soil, and the specific containing mode is prior art, which is not described here, wherein the limit ring 12 is used to support metal hole plate, so as to support the improved saline soil loaded in the inside of permeation cylinder 1 using the metal hole plate, prevent improved saline soil from leaking out from the bottom of permeation cylinder 1, above described is also prior art, which is not described here.

[0029] Different from the prior art, the infiltration cylinder 1 in the embodiment comprises a plurality of cylinder bodies 11, and a blocking component 2 is arranged between two adjacent cylinder bodies 11; the blocking component 2 can block the water between the improved saline soil and the inner wall surface of the cylinder body 11, prevent the water from leaking along the gap between the improved saline soil and the inner wall surface of the cylinder body 11, and improve the accuracy of experimental results; the blocking component 2 needs to be used in cooperation with a pressurizing component 3, and the specific structure and working principle of the blocking component 2 and the pressurizing component 3 will be described below.

[0030] The blocking component 2 comprises an annular accommodating chamber 21 and an elastic inner wall 22, the elastic inner wall 22 is an inner annular wall of the annular accommodating chamber 21, and the elastic inner wall 22 is flush with the inner circumferential wall of the infiltration cylinder 1; each blocking component 2 is correspondingly provided with one pressurizing component 3, the pressurizing component 3 can increase the pressure inside the annular accommodating chamber 21, so that the elastic inner wall 22 can protrude from the inner wall of the cylinder body 11; the accommodating cavity 32 inside the pressurizing component 3 and the annular accommodating chamber 21 both contain fluid, the fluid here can be water, air or hydraulic oil, and the accommodating cavity 32 is in communication with the annular accommodating chamber 21; the accommodating cavity 32 is internally provided with a piston 34, the fluid in the accommodating cavity 32 can enter the annular accommodating chamber 21 by pushing the piston 34 forward, so that the elastic inner wall 22 at least partially protrudes from the inner circumferential wall of the infiltration cylinder 1; specifically, under normal circumstances, the elastic inner wall 22 is flush with the inner circumferential wall of the infiltration cylinder 1, so the elastic inner wall 22 does not block the installation of the metal hole plate for supporting the improved saline soil, and the metal hole plate can be smoothly placed on the limiting ring 12, and after the improved saline soil is filled, the elastic inner wall 22 is used to extrude the improved saline soil to cut off the path of water penetration between the improved saline soil and the inner wall surface of the cylinder body 11, and the specific method is as follows: directly push the piston 34 forward (i.e., push the piston 34 towards the axis of the cylinder body 11), extrude the fluid originally inside the accommodating cavity 32 into the inside of the annular accommodating chamber 21, increase the fluid pressure inside the annular accommodating chamber 21, and under the action of the pressure, since the elastic inner wall 22 has a certain elasticity, the elastic inner wall 22 will gradually protrude from the inner wall surface of the cylinder body 11, so that the inner circumferential surface of the elastic inner wall 22 can extrude the improved saline soil, realize the sealed connection between the elastic inner wall 22 and the improved saline soil, and thus prevent the side wall from leaking.

[0031] Further, the blocking component 2 further comprises an annular outer wall 24 and two sealing walls 23, the elastic inner wall 22 and the sealing wall 23 are both made of rubber, the material of the annular outer wall 24 can be kept the same as the barrel 11, the two sealing walls 23 are integrally formed at the upper and lower ends of the elastic inner wall 22 respectively, the annular outer wall 24 is arranged between the two sealing walls 23, the elastic inner wall 22, the annular outer wall 24 and the two sealing walls 23 cooperatively form the annular accommodating chamber 21, and the annular outer wall 24 is fixedly arranged between the two adjacent barrels 11; the blocking component 2 further comprises a fixing ring 26, the fixing ring 26 is fixedly connected with the barrel 11, the material of the fixing ring 26 is the same as the barrel 11, the fixing ring 26 and the barrel 11 can be integrally formed, and the annular outer wall 24 is fixedly connected with the fixing ring 26 through a fastener, the fastener in the embodiment is a bolt 25, the annular outer wall 24 and the two adjacent fixing rings 26 are fixedly connected together through the bolt, so that the annular outer wall 24 and the fixing ring 26 extrude the sealing wall 23, that is, the annular outer wall 24 and the fixing ring 26 are fixedly and sealingly connected.

[0032] The pressurizing component 3 further comprises an accommodating pipe 31, a communication pipe 33, a nut 35 and a screw rod 36; the nut 35 is coaxially fixedly connected with the accommodating pipe 31, and a gap is left between the nut 35 and the accommodating pipe 31, the gap is used for making the space between the nut 35 and the piston 34 communicate with the external environment; the accommodating pipe 31, the piston 34 and the communication pipe 33 jointly form an accommodating cavity 32; the communication pipe 33 is communicated between the accommodating cavity 32 and the annular accommodating chamber 21, and in the embodiment, the communication pipe 33 is fixedly connected with the annular outer wall 24; the screw rod 36 is threadedly connected with the nut 35, and one end of the screw rod 36 is rotatably connected with the piston 34, and in some embodiments, the one end of the screw rod 36 can be rotatably connected with the piston 34 through a bearing coaxially arranged with the screw rod 36; the other end of the screw rod 36 is fixedly connected with a handle 37.

[0033] In the above scheme, the position of the piston 34 is adjusted through the cooperation of the screw rod 36 and the nut 35, which can facilitate the operation of the staff.

[0034] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A device for testing the permeability of a saline soil, comprising a permeameter and a limiting ring arranged at the bottom of the inner circumferential surface of the permeameter, characterized in that, The permeation cylinder comprises a plurality of cylinder bodies, and a blocking component is arranged between two adjacent cylinder bodies; The blocking component comprises an annular accommodating chamber and an elastic inner wall, the elastic inner wall is an inner annular wall of the annular accommodating chamber, and the elastic inner wall is flush with the inner circumferential wall of the permeation cylinder; Each blocking component is correspondingly provided with a pressurizing component, the accommodating cavity in the pressurizing component and the annular accommodating chamber accommodate fluid, and the accommodating cavity and the annular accommodating chamber are in communication; The accommodating cavity is internally provided with a piston, the fluid in the accommodating cavity can enter the annular accommodating chamber by pushing the piston to move forward, and the elastic inner wall is at least partially protruded from the inner circumferential wall of the permeation cylinder.

2. The improved osmotic test device for saline soil according to claim 1, wherein The blocking component further comprises an annular outer wall and two sealing walls, the two sealing walls are integrally formed at the upper and lower ends of the elastic inner wall respectively, the annular outer wall is arranged between the two sealing walls, and the elastic inner wall, the annular outer wall and the two sealing walls cooperatively form the annular accommodating chamber, and the annular outer wall is fixedly arranged between the two adjacent cylinder bodies.

3. The device for testing the permeability of saline soil according to claim 2, wherein The blocking component further comprises a fixing ring, the fixing ring is fixedly connected with the cylinder body, and the annular outer wall is fixedly connected with the fixing ring through a fastener.

4. The device for testing the permeability of saline soil according to claim 3, wherein The fastener is a bolt.

5. The device for testing the permeability of saline soil according to claim 3, wherein The elastic inner wall and the sealing wall are both made of rubber.

6. The device for testing the permeability of saline soil according to claim 1, wherein The pressurizing component further comprises an accommodating tube, a communication tube, a nut and a screw rod; The nut is coaxially fixedly connected with the accommodating tube, and a gap is left between the nut and the accommodating tube; The accommodating tube, the piston and the communication tube jointly form the accommodating cavity; The communication tube is in communication between the accommodating cavity and the annular accommodating chamber; The screw rod is threadedly connected with the nut, and one end of the screw rod is rotationally connected with the piston.

7. The device for testing the permeability of saline soil according to claim 6, wherein The other end of the screw rod is fixedly connected with a handle.

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