CN101673483B - Testing device of visual display foundation vertical stress variation law under the action of concentrated force - Google Patents
Testing device of visual display foundation vertical stress variation law under the action of concentrated force Download PDFInfo
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- CN101673483B CN101673483B CN2009101965754A CN200910196575A CN101673483B CN 101673483 B CN101673483 B CN 101673483B CN 2009101965754 A CN2009101965754 A CN 2009101965754A CN 200910196575 A CN200910196575 A CN 200910196575A CN 101673483 B CN101673483 B CN 101673483B
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention relates to a testing device of visual display foundation vertical stress variation law under the action of concentrated force, comprising U-shaped communicating tubes, a bracket and a vent valve, wherein, n U-shaped communicating tubes are arranged and installed on the bracket in parallel at equal distance, and n is the natural number except zero; a drain valve is arranged on the communicating tube between adjacent U-shaped communicating tubes; the lower part of each U-shaped communicating tube is respectively provided with a bulged opening connected with one end of a transparent rubber hose, the other end of the transparent rubber hose is connected with a flat rubber water sac, and the end part of the flat rubber water sac is provided with the vent valve. The invention has simple structure and easy fabrication; the flat rubber water sacs embedded in different positions of foundation earth in a model box receives different pressures to ensure that the liquid level of the U-shaped communicating tube changes, thus visually displaying the foundation vertical stress variation law under the action of concentrated force.
Description
Technical field
The present invention is a kind of display device of foundation stress, relates in particular in the display set directly perceived ground vertical stress Changing Pattern under the power effect, belongs to the soil mechanics teaching field.
Background technology
The space problem elementary solution---Boussinesq separates
On the elastomeric surface of the semi-infinite space, effect one vertical concentrated force, as shown in Figure 1.
1885, J.V.Boussinesq solved the extra-stress state issues in the ground under the concentrated force effect with theory of elasticity.In 6 components of stress that Boussinesq separates, to ground settlement calculation meaning maximum is vertical stress σ
z, its regularity of distribution also is crucial part naturally.
In the formula
R---calculation level M is to the distance of true origin, m
Z---calculation level M is apart from the vertical depth of ground surface, m
The vertical concentrated force of P---foundation surface, N
Because vertically the stress state in the ground is the rotational symmetry space problem under the concentrated force effect, therefore can on any vertical plane that is cut out by the P active line, carry out σ
zThe discussion of distribution characteristics.
1. the σ on concentrated force P active line
zDistribute
On the P active line, r=0, by formula (2) and formula (1) as can be known,
When z=0, σ
z→ ∞.This result occurring is because the concentrated force active area is regarded as due to zero.It say on the one hand this separate inapplicable concentrated force application point place and near, therefore when selecting Stress calculation point, should be too near the concentrated force application point; Also illustrate on the other hand at the close stress σ of P active line place
zVery big.As z → ∞, σ
z=0.The z=0 point is a singular point, should avoid this some during display device cloth measuring point.
As seen, along σ on the P active line
zDistribution be to increase with the degree of depth to successively decrease, as shown in Figure 2.
2. the σ on the vertical curve of r＞0
zDistribute
As seen from formula (1), during z=0, σ
z=0; Along with the increase of z, σ
zIncrease gradually from zero, the increase along with z diminishes gradually again to the certain depth, as shown in Figure 2.
3. the σ on the surface level of z=constant
zDistribute
σ
zValue is maximum on the concentrated force active line, and reduces gradually along with the increase of r.Along with depth z increases, the σ on the concentrated force active line
zReduce, and the distribution of surface level upper stress is tending towards evenly, as shown in Figure 2.
In the prior art, also do not have can display set directly perceived in the test unit of ground vertical stress Changing Pattern under the power effect.
Summary of the invention
The objective of the invention is to the defective that exists at prior art, the test unit of ground vertical stress Changing Pattern under the power effect is provided in a kind of display set directly perceived,, make the soil mechanics teaching tool that iconicity and vividness be arranged in conjunction with foundation stress model test in the testing laboratory.
For achieving the above object, design of the present invention is:
Ground vertical stress Changing Pattern is well known under the concentrated force effect, but only limits to abstract calculating mapping law of character graphics displaying.
With a series of U-shaped communicating pipe constituent apparatus chief component, be placed on the support among the present invention, between each communicating pipe water control valve be set, every all has place's tang communicating pipe, for connecting the transparent rubber pipe, the other end of rubber tube connects the flat rubber water pocket, and the water pocket end is provided with vent valve.
According to the foregoing invention design, the present invention adopts following technical proposals:
The test unit of ground vertical stress Changing Pattern under the power effect in a kind of display set directly perceived, it comprises U-shaped communicating pipe, support and vent valve, individual described U-shaped communicating pipe of n, equidistant being arranged in parallel was placed on the described support, n is the natural number except that zero, each adjacent U-shaped communicating pipe between communicating pipe is provided with draining valve, the bottom of described each U-shaped communicating pipe respectively has a tang to connect an end of a transparent rubber pipe, the other end of described transparent rubber pipe connects a flat rubber water pocket, and the end of described flat rubber water pocket is provided with described vent valve.
The present invention has following conspicuous outstanding substantive distinguishing features and remarkable advantage compared with prior art:
Simple structure of the present invention is made easily, is embedded in the different pressures that the flat rubber water pocket of foundation soil different parts in the model casing is subjected to the liquid level of each U-shaped communicating pipe is changed, thereby represent ground vertical stress Changing Pattern under the concentrated force effect visually.
Description of drawings
Accompanying drawing 1 is separated ground extra-stress component graph of a relation for Boussinesq
Accompanying drawing 2 is separated vertical stress regularity of distribution figure for Boussinesq
Accompanying drawing 3 is a test unit structural representation of the present invention
Accompanying drawing 4 is a vertical stress vertical distribution synoptic diagram under the point of force application in this test unit display set directly perceived
Accompanying drawing 5 intuitively shows the vertical stress vertical distribution synoptic diagram apart from concentrated force effect r place for this test unit
Accompanying drawing 6 is located half the horizontal distribution synoptic diagram of vertical stress of symmetry for this test unit intuitively shows apart from ground z (more shallow)
Accompanying drawing 7 is located half the horizontal distribution synoptic diagram of vertical stress of symmetry for this test unit intuitively shows apart from ground z (darker)
Embodiment
In conjunction with the accompanying drawings, the present invention is described in further detail by a preferred embodiment: referring to accompanying drawing 3, the test unit of ground vertical stress Changing Pattern under the power effect in the display set directly perceived, comprise U-shaped communicating pipe 1, support 5, vent valve 6, it is characterized in that n described U-shaped communicating pipe (1) equidistant being arranged in parallel is placed on the described support 5, n is the natural number except that zero, each adjacent communicating pipe of 1 of U-shaped communicating pipe is provided with draining valve 2, the bottom of described each U-shaped communicating pipe 1 respectively has a tang to connect an end of a transparent rubber pipe 3, the other end of described transparent rubber pipe 3 connects a flat rubber water pocket 4, and the end of described flat rubber water pocket 4 is provided with described vent valve 6.U-shaped communicating pipe high 1 is decided by the used model casing size of test, distribution distance, foundation stress size with rubber tube 3 length; The number n of U-shaped communicating pipe (1) is decided by what of test institute measuring point.
The test operation step is as follows:
1. before the test, open all water control valves 2, water filling in U-shaped communicating pipe (1) arbitrary U-shaped pipe, make that water enters U-shaped communicating pipe 1, transparent rubber pipe 3, flat rubber water pocket 4, the vent valve 6 of flat rubber water pocket 4 is opened, and the gas in the remover makes water be full of whole device, close all vent valves 6, wait for that the liquid level of U-shaped communicating pipe 1 arrives balance.
2. load foundation soil in model casing, flat rubber water pocket 4 is arranged in the foundation soil, separate the vertical stress analysis on change according to Boussinesq, during r=0, flat rubber water pocket 4 was arranged by concentrated force in proper order from top to bottom by U-shaped communicating pipe 1; R＞0 o'clock, force r arranges flat rubber water pocket 4 from top to bottom in the place in distance set; In like manner, the σ on the surface level that is determined at the z=constant
zDuring distribution, flat rubber water pocket 4 is that a certain constant place is horizontally disposed at z.
3. arrange flat rubber water pocket 4, layering installs foundation soil, waits for the liquid level balance under the foundation soil gravity stress in U-shaped communicating pipe 1, behind the level balance, closes all water control valves 2.
4. carry out the test of ground stress model, after the loading, will see the level change of each U-shaped pipe in U-shaped communicating pipe 1, the height of liquid level links curve will intuitively represent the situation of change of burying the position vertical stress underground.Fig. 4, Fig. 5, Fig. 6 and Fig. 7 illustrate vertical stress vertical distribution and the horizontal distribution rule under each test condition.
Claims (1)
1. the test unit of ground vertical stress Changing Pattern under the power effect in the display set directly perceived, comprise U-shaped communicating pipe (1), support (5), vent valve (6), it is characterized in that n described U-shaped communicating pipe (1) equidistant being arranged in parallel is placed on the described support (5), n is the natural number except that zero, be provided with draining valve (2) communicating pipe between each adjacent U-shaped communicating pipe (1), the bottom of described each U-shaped communicating pipe (1) respectively has a tang to connect an end of a transparent rubber pipe (3), the other end of described transparent rubber pipe (3) connects a flat rubber water pocket (4), and the end of described flat rubber water pocket (4) is provided with described vent valve (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101965754A CN101673483B (en) | 2009-09-27 | 2009-09-27 | Testing device of visual display foundation vertical stress variation law under the action of concentrated force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101965754A CN101673483B (en) | 2009-09-27 | 2009-09-27 | Testing device of visual display foundation vertical stress variation law under the action of concentrated force |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101673483A CN101673483A (en) | 2010-03-17 |
| CN101673483B true CN101673483B (en) | 2011-10-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009101965754A Expired - Fee Related CN101673483B (en) | 2009-09-27 | 2009-09-27 | Testing device of visual display foundation vertical stress variation law under the action of concentrated force |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102866032B (en) * | 2012-09-27 | 2016-01-27 | 安徽理工大学 | similar material simulation test system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2206952Y (en) * | 1994-12-20 | 1995-09-06 | 田耕和 | Indoor static load tester |
| CN2854260Y (en) * | 2005-09-29 | 2007-01-03 | 宝山钢铁股份有限公司 | Water-sealed multiple gas flow direction regulator |
-
2009
- 2009-09-27 CN CN2009101965754A patent/CN101673483B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2206952Y (en) * | 1994-12-20 | 1995-09-06 | 田耕和 | Indoor static load tester |
| CN2854260Y (en) * | 2005-09-29 | 2007-01-03 | 宝山钢铁股份有限公司 | Water-sealed multiple gas flow direction regulator |
Non-Patent Citations (2)
| Title |
|---|
| JP特开平9-41369A 1997.02.10 |
| 张孟喜等.条形荷载下H-V加筋砂土地基模型试验研究.《土木工程学报》.2008,第41卷(第2期),94-99. * |
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| CN101673483A (en) | 2010-03-17 |
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