CN201429594Y - High Pressure Osmotic Consolidation Apparatus - Google Patents

Abstract

The utility model discloses a high-pressure osmotic consolidation instrument, which comprises a cylindrical pressure chamber, a top cover and a base respectively installed at the upper and lower ends of the pressure chamber, and a piston interspersed on the top cover. The upper part has a water outlet and the lower end is filled with permeable stones through concave platform one. The water outlet and concave platform one are connected through axial drainage channels. The upper end of the base is filled with permeable stones through concave platform two and the lower end is opened with concave platform three. A water inlet is opened on the base between the second concave platform and the third concave platform, and the water inlet communicates with the second concave platform. The utility model has the advantages of compact structure, convenient use and operation, multiple functions and good test effect, and can collect the lateral stress and pore water pressure of the soil sample during the test.

Description

High Pressure Osmotic Consolidation Apparatus

technical field

The utility model belongs to the technical field of soil test research, in particular to a high-pressure osmotic consolidation instrument capable of carrying out a penetration test and a consolidation test at the same time.

Background technique

Carry out soil sample consolidation test and penetration test in the prior art mainly contain following several instruments:

1. LoadTrac II constant rate consolidation test system, produced by GEOCOMP of the United States, can automatically complete the entire constant rate consolidation test, and its maximum pressure range is 3.5MPa; although the instrument is easy to operate and has high precision, it can only complete ordinary Consolidation tests under constant rate loading.

2. Rowe-type consolidation test system, produced by GEOCOMP Company of the United States, can automatically complete the consolidation test with constant rate and step-by-step loading. Its maximum pressure range is 3.5Mpa, and it can only complete ordinary consolidation tests.

3. Fully automatic penetration test system, produced by GEOCOMP Company of the United States, can automatically complete ordinary penetration tests.

4. Triple high-pressure consolidation instrument, made in China, is used for soil compression test, to measure the relationship between soil deformation and pressure, or the relationship between void ratio and pressure, and the relationship between deformation and time, and calculate the unit settlement of soil, compression coefficient and Index, rebound index, compressive modulus, consolidation coefficient, etc., the pressure range is 12.5KPa-4000KPa, but only ordinary consolidation tests can be completed.

To sum up, the above-mentioned instruments can only perform simple consolidation tests or penetration tests, and the consolidation pressure is low, making it difficult to carry out relevant tests on deeply buried soil layers.

Utility model content

The technical problem to be solved by the utility model is to provide a high-pressure osmotic consolidation instrument, which is compact in structure, easy to use and operate, multi-function, good test effect, and can collect soil samples during the test process. lateral stress and pore water pressure.

In order to solve the above technical problems, the technical solution adopted by the utility model is: a high-pressure osmotic consolidation instrument, which is characterized in that it includes a vertical cylindrical pressure chamber, a top cover installed at the upper and lower ends of the pressure chamber and The base and the piston that are interspersed on the top cover and can move up and down in the inner cavity of the pressure chamber, the top cover is provided with a bracket for installing a dial indicator or a dial indicator, and the upper part of the piston has a diameter The water outlet in the direction and the lower end passes through the disc-shaped central concave platform-filled with permeable stones, the water outlet and the concave platform-are connected through an axial drainage channel, and the upper end of the base passes through the disc-shaped central concave platform The second is filled with water-permeable stones and the lower end is opened with a recessed platform 3 for connecting with the piston of the press. On the base, there is a water inlet in the radial direction between the said concave platform 2 and the said concave platform 3. The water inlet communicates with the two recesses.

The lower section of the side wall of the pressure chamber is axially distributed with a plurality of pore water manometer interfaces, and each of the pore water manometer interfaces communicates with the inner cavity of the pressure chamber.

The lower section of the side wall of the pressure chamber is provided with a lateral stress gauge interface, and the lateral stress gauge interface communicates with the inner cavity of the pressure chamber.

Two brackets are symmetrically arranged on the top cover.

The pressure chamber and the base are connected by a flange, and a sealing ring is arranged between the pressure chamber and the base.

There is a threaded connection between the top cover and the pressure chamber.

Compared with the prior art, the utility model has the following advantages: 1. Compact structure, easy to use and operate; Carry out the penetration test under the joint pressure, or conduct the deformation test under the action of the seepage force, so that each test data has a good correlation, and because the same soil sample is used to conduct different tests at the same time, the sampling workload and errors caused by sampling can be reduced; 3. Since the piston sealing technology adopts the engine piston sealing technology, the test proves that the axial pressure and sealing pressure that this device can withstand can reach 16Mpa, so it has the characteristics of high consolidation pressure compared with the existing device; 4. The lateral stress of the soil sample and the pore water pressure at different positions during the test can be collected through the lateral stress gauge and each pore water pressure gauge, and the friction force between the soil sample and the side wall of the pressure chamber can be measured.

The technical solutions of the present utility model will be further described in detail through the drawings and embodiments below.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Explanation of reference signs:

1-water outlet; 2-bracket; 3-top cover;

4-piston; 5-pressure chamber; 6-pore water pressure gauge interface;

7-water inlet; 8-base; 9-permeable stone;

10-sealing ring; 11-lateral stress gauge interface.

Detailed ways

As shown in Figure 1, the utility model includes a vertically arranged cylindrical pressure chamber 5, a top cover 3 and a base 8 fixedly installed on the upper and lower ends of the pressure chamber 5, and a top cover 3 that can be installed on the pressure chamber 5. The inner cavity of the piston 4 moves up and down, wherein the top cover 3 is provided with a support 2 for installing displacement measuring devices such as a dial gauge or a dial gauge, so that when the utility model is installed on the workbench, the dial gauge Or the measuring rod of the dial indicator is vertically arranged, and the contact of the measuring rod is all supported on the lower surface of the I-beam between the left and right supporting frames of the workbench, so that the installation and reading are convenient. The upper part of the piston 4 has a water outlet 1 in the radial direction, the lower end of the piston 4 is filled with a permeable stone 9 through a disc-shaped central concave platform, and the water outlet 1 and the concave platform are connected through an axial drainage channel, The upper end of the base 8 is filled with permeable stone 9 through the disc-shaped central concave platform 2, and the lower end of the base 8 has a concave platform 3 for connecting with the press, and is located on the base 8 and located between the concave platform 2 and the There is a water inlet 7 in the radial direction between the third concave platform, and the water inlet 7 communicates with the second concave platform.

In order to measure the lateral stress of the soil sample and the pore water pressure at different positions during the test, and to make the friction between the soil sample and the side wall of the pressure chamber 5 measurable, a lateral Stress gauge interface 11, and a plurality of pore water pressure gauge interfaces 6 are axially and evenly distributed on the lower section of the side wall of pressure chamber 5, and the lateral stress gauge interface 11 and each pore water pressure gauge interface 6 are connected with the inner surface of pressure chamber 5. The cavities communicate. In this embodiment, the number of pore water pressure gauge interfaces 6 is three.

In the present embodiment, two brackets 2 are symmetrically arranged on the top cover 3, corresponding to it, and displacement measuring devices such as a dial indicator or a dial indicator are respectively installed on the two brackets 2, so that the The two displacement readings are read by the left and right displacement measuring devices to correct each other and reduce the reading error.

In this embodiment, the pressure chamber 5 and the base 8 are connected by a flange, and a sealing ring 10 is provided between the pressure chamber 5 and the base 8, and the sealing ring 10 makes the connection achieve good sealing. There is a threaded connection between the top cover 3 and the pressure chamber 5 .

Taking cohesive soil as an example, the process of using the utility model to carry out the penetration consolidation test is:

1. Open the flange between the pressure chamber 5 and the base 8, put the soil sample into the inner cavity of the pressure chamber 5, then close the flange connecting the pressure chamber 5 and the base 8 with bolts, and install the device On the workbench, make the piston of the press at the bottom of the workbench extend into the concave platform 3 at the lower end of the base 8, so that the piston 4 is fixedly connected with the I-beam on the workbench, wherein the workbench includes a base, is installed on The press on the base, the two support frames symmetrically arranged on the base and located on the left and right sides of the press, and the I-beam horizontally arranged between the two support frames;

2. Install dial gauges on the two brackets 2, and make the contacts of the two dial gauges stand on the lower surface of the I-beam respectively. Install a water inlet pipe with a water pressure control device on the water inlet 7. An outlet pipe with a flowmeter is installed on the water outlet 1, a lateral stress gauge is installed on the lateral stress gauge interface 11, and a pore water pressure gauge is installed on each pore water pressure gauge interface 6;

3. Pressurized by the press, the pressure chamber 5 moves upward relative to the piston 4, so that the lower end surface of the piston 4 is close to the soil sample;

4. Pressurize the water in the pressure chamber through the water inlet pipe installed on the water inlet 7 to exhaust the soil sample;

5. Apply a certain axial pressure through the press, and read the axial deformation displacement of the soil sample through the dial indicator. When the deformation of the soil sample is stable, conduct the penetration test through the water pressure control device and the flow meter;

6. Change the axial pressure of the press, and conduct the consolidation test and penetration test again;

7. During the test in steps 5 and 6, the lateral stress of the soil sample and the pore water pressure at different positions are collected through the lateral stress gauge and each pore water pressure gauge.

The utility model can also be used to separately carry out a consolidation test, a penetration test or a deformation test of a sample under the action of penetration force.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any simple modifications, changes and equivalent structural transformations made to the above embodiments according to the technical essence of the present utility model still belong to Within the scope of protection of the technical solution of the utility model.

Claims (7)

1. high-pressure permeability consolidometer, it is characterized in that: the tubular pressure chamber (5) that comprises vertical setting, be installed in respectively described pressure chamber (5) up and down the top cover at two ends (3) and base (8) and interting be arranged on that described top cover (3) is gone up and can be in the pressure chamber piston (4) that moves up and down of the inner chamber of (5), described top cover (3) is provided with the support (2) that is used to install clock gauge or dial gauge, water delivering orifice (1) and lower end that the top of described piston (4) has radial direction are filled with permeable stone (9) by discoid center concave station one, described water delivering orifice (1) and described concave station one are connected by axial drainage channel, the upper end of described base (8) is filled with permeable stone (9) and lower end by discoid center concave station two and has and be used for the concave station three that is connected with rampiston, go up and have the water inlet (7) of radial direction at base (8) between described concave station two and described concave station three, described water inlet (7) and described concave station two communicate.

2. according to the described high-pressure permeability consolidometer of claim 1, it is characterized in that: the sidewall hypomere axial distribution of described pressure chamber (5) has a plurality of pore pressure gauge interfaces (6), and described each pore pressure gauge interface (6) all communicates with the inner chamber of pressure chamber (5).

3. according to claim 1 or 2 described high-pressure permeability consolidometers, it is characterized in that: the sidewall hypomere of described pressure chamber (5) is provided with lateral stress meter interface (11), and described lateral stress meter interface (11) communicates with the inner chamber of pressure chamber (5).

4. according to claim 1 or 2 described high-pressure permeability consolidometers, it is characterized in that: be symmetrically set with two supports (2) on the described top cover (3).

5. according to the described high-pressure permeability consolidometer of claim 3, it is characterized in that: be symmetrically set with two supports (2) on the described top cover (3).

6. according to the described high-pressure permeability consolidometer of claim 5, it is characterized in that: described pressure chamber (5) are connected by flange with base (8), and are provided with O-ring seal (10) between pressure chamber (5) and base (8).

7. according to the described high-pressure permeability consolidometer of claim 6, it is characterized in that: between described top cover (3) and pressure chamber (5) for being threaded.

Images