CN101865800A - Tester for testing foundation soil bearing capacity and deformation characteristic indoors and method thereof - Google Patents

Abstract

The invention discloses a tester for testing foundation soil bearing capacity and deformation characteristic indoors and a method thereof, and relates to a soil engineering test technology. The tester comprises foundation soil (00), a counter force device (10), a testing system (20) and a specimen box (30), wherein the counter force device (10) and the specimen box (30) are connected up and down to form a test platform, the foundation soil (00) is filled in the specimen box (30), and the testing system (20) is arranged under the counter force device (10) and in the foundation soil (00). The invention can test and research the bearing capacity and deformation characteristic of the foundation soil with different density, can test and research the sedimentation and soil pressure of soil at different depths, discloses the transfer rule of load in the soil body, and is suitable for the tests on the bearing capacity and the deformation characteristic related to foundation soil such as viscous soil, sand, gravelly soil, sludge and the like.

Description

The test unit of indoor test bearing capacity of foundation slab and deformation characteristic and method thereof

Technical field

The present invention relates to a kind of geotechnological measuring technology, relate in particular to the test unit and the method thereof of a kind of indoor test bearing capacity of foundation slab and deformation characteristic.

Background technology

Load test is a kind of home position testing method of testing bearing capacity of foundation slab and settling amount, usually implement at the scene, but can only test the bearing capacity and the deflection of ground, can't disclose the transfer law of load in the soil body, also can't obtain the sedimentation value at soil body different depth place.

Summary of the invention

Purpose of the present invention just is to study bearing capacity and the deformation characteristic of different ground soil materials under different packings, and the test unit and the method thereof of a kind of indoor test bearing capacity of foundation slab and deformation characteristic is provided.

The object of the present invention is achieved like this:

1, the test unit of a kind of indoor test bearing capacity of foundation slab and deformation characteristic (abbreviation device)

This device comprises foundation soil, counterforce device, test macro and sample box;

Counterforce device and sample box connect and compose test platform up and down, are filled with foundation soil in sample box, test macro be arranged at below the counterforce device and foundation soil in.

2, the test method of a kind of indoor test bearing capacity of foundation slab and deformation characteristic (abbreviation method)

This method comprises the following steps:

1. in sample box, load the foundation soil material, and buried micro pressure box and sedimentation mark underground;

2. installed load plate, lifting jack and clock gauge are adjusted force-transmitting pole;

3. soil pressure cell is connected to the static resistance strainmeter, zeroing;

4. according to " load test standard " precompressed, loading and test.

3, principle of work of the present invention

1. counterforce device provides counter-force to lifting jack, and wherein force-transmitting pole can be adjusted the distance between lifting jack and the crossbeam;

2. load by lifting jack, be drilled with aperture on the load plate, the sedimentation mark passes aperture and is embedded in the foundation soil, and sedimentation is put on clock gauge survey sedimentation target sedimentation deformation is installed, and buries soil pressure cell underground below each sedimentation is marked, and surveys soil pressure by the static resistance strainmeter;

3. sample box is used for preparing sample, and tests.

The present invention has following advantage and good effect:

1. can test bearing capacity and deformation characteristic with the foundation soil of studying different packings.

2. can test and study the sedimentation and the soil pressure at soil body different depth place, disclose the transfer law of load at inside soil body.

3. be applicable to the relevant bearing capacity of foundation soils such as cohesive soil, sand, gravelly soil and mud and the test of deformation characteristic.

Description of drawings

Fig. 1 is the structural representation of this device.

Wherein:

The 00-foundation soil;

The 10-counterforce device,

The 11-column, 12-crossbeam, 13-force-transmitting pole;

The 20-test macro,

The 21-load plate, the 22-lifting jack, 23-sedimentation mark,

The 24-clock gauge, the 25-soil pressure cell, the 26-lead,

27-static resistance strainmeter, the 28--oil pressure gauge;

The 30-sample box.

Embodiment

Describe in detail below in conjunction with drawings and Examples:

One, device

1, overall

As Fig. 1, this device comprises foundation soil 00, counterforce device 10, test macro 20 and sample box 30;

Counterforce device 10 and sample box 30 connect and compose test platform up and down, are filled with foundation soil 00 in sample box 30, and test macro 20 is arranged at below the counterforce device 10 and in the foundation soil 00.

2, functional block

0) foundation soil 00

Foundation soil 00 is a subjects, comprises cohesive soil, sand, gravelly soil and mud.

1) counterforce device 10

Counterforce device 10 is made up of column 11, crossbeam 12 and force-transmitting pole 13;

About two columns 11 be fixed on the sample box 30, be connected with crossbeam 12 on the top of two columns 11, be connected with force-transmitting pole 13 in the lower end, middle part of crossbeam 12.

The function of counterforce device 10 is to provide counter-force to test macro 20.

2) test macro 20

Test macro 20 is made up of load plate 21, lifting jack 22, sedimentation mark 23, clock gauge 24, soil pressure cell 25, lead 26, static electronics strainmeter 27 and oil pressure gauge 28;

Force-transmitting pole 13, lifting jack 22, load plate 21 connect up and down successively;

Be embedded in sedimentation mark 23 its upper ends in the foundation soil 00 and pass load plate 21 backs and is connected with clock gauge 24,23 lower end 3-5 centimeters placement soil pressure cells 25 are marked in sedimentation, and soil pressure cell 25 passes through lead 26 and is connected with static electronics strainmeter 27.

(1) load plate 21

Load plate 21 is the sheet metals that thickness is 10mm, and three apertures that the aperture is 4mm of middle brill are so that sedimentation mark 23 passes.

The effect of load plate 21 is that Load Transfer with lifting jack 22 is in foundation soil 00.

(2) lifting jack 22

Lifting jack 22 is small-sized hydraulic jack.

The effect of lifting jack 22 is the sizes that load and pass through oil pressure gauge 28 control loaded to load plate 21.

(3) the sedimentation mark 23

Sedimentation mark 23 is welded by the length * iron plate of wide * thick=2cm * 2cm * 2mm and the long Metallic rod of diameter 2mm, and the upper end is added with nut.

Sedimentation is marked 23 upper ends and is set up clock gauge 24 and measure in the foundation soils 00 certain any sedimentation deformation.

(4) clock gauge 24

The effect of clock gauge 24 is settling amounts of measuring sedimentation mark 23.

(5) soil pressure cell 25

Soil pressure cell 25 is miniature soil pressure cell.

The effect of soil pressure cell 25 is to measure in the foundation soil certain any soil pressure.

(6) lead 26

Lead 26 is the ordinary copper lead.

The effect of lead 26 is to connect soil pressure cell 25 and static electronics strainmeter 27;

(7) static electronics strainmeter 27

Static electronics strainmeter 27 has the listing product.

The effect of static electronics strainmeter 27 is to measure the suffered pressure of soil pressure cell 25.

(8) oil pressure gauge 28

Oil pressure gauge 28 has the listing product.

Oil pressure gauge 28 is connected on the lifting jack 22, the size that control lifting jack 22 loads.

3) sample box 30

Sample box 30 is canisters, making, splendid attire soil sample;

Be designed to square, its length * wide * height=1000mm * 1000mm * 1000mm;

Employing thickness is that the steel plate of 10mm is welded.

Claims (5)

1. the test unit of indoor test bearing capacity of foundation slab and deformation characteristic is characterized in that:

Comprise foundation soil (00), counterforce device (10), test macro (20) and sample box (30);

Counterforce device (10) and sample box (30) connect and compose test platform up and down, are filled with foundation soil (00) in sample box (30), test macro (20) be arranged at below the counterforce device (10) and foundation soil (00) in.

2. by the described test unit of claim 1, it is characterized in that:

Described foundation soil (00) is a subjects, comprises cohesive soil, sand, gravelly soil and mud.

3. by the described test unit of claim 1, it is characterized in that:

Described counterforce device (10) is made up of column (11), crossbeam (12) and force-transmitting pole (13);

About two columns (11) be fixed on the sample box (30), be connected with crossbeam (12) on the top of two columns (11), be connected with force-transmitting pole (13) in the lower end, middle part of crossbeam (12).

4. by the described test unit of claim 1, it is characterized in that:

Described test macro (20) is made up of load plate (21), lifting jack (22), sedimentation mark (23), clock gauge (24), soil pressure cell (25), lead (26), static electronics strainmeter (27) and oil pressure gauge (28);

Force-transmitting pole (13), lifting jack (22), load plate (21) connect up and down successively;

Being embedded in its upper end of sedimentation mark (23) in the foundation soil (00) passes load plate (21) back and is connected with clock gauge (24), sedimentation mark (23) lower end 3-5 centimeters is placed soil pressure cell (25), and soil pressure cell (25) is connected with static electronics strainmeter (27) by lead (26).

5. based on the test method of the described test unit of claim 1, it is characterized in that comprising the following steps:

1. in sample box, load the foundation soil material, and buried micro pressure box and sedimentation mark underground;

2. installed load plate, lifting jack and clock gauge are adjusted force-transmitting pole;

3. connect the line to the static resistance strainmeter, zeroing;

4. according to " load test standard " precompressed, loading and test.

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