CN108362456A - A kind of small-sized high frequency soil dynamic load experimental provision - Google Patents
A kind of small-sized high frequency soil dynamic load experimental provision Download PDFInfo
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- CN108362456A CN108362456A CN201810335672.6A CN201810335672A CN108362456A CN 108362456 A CN108362456 A CN 108362456A CN 201810335672 A CN201810335672 A CN 201810335672A CN 108362456 A CN108362456 A CN 108362456A
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- soil
- pressure
- high frequency
- dynamic load
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
Abstract
The invention discloses a kind of small-sized high frequency soil dynamic load experimental provisions comprising：Electromagnetic vibration generator system includes the vibrating controller and vibration table surface of interconnection；Model casing, is fixed on the upper surface of the vibration table surface, and the inside of the model casing is placed with soil sample；Loading unit, pressure are attached to the upper surface of the soil sample；Determination unit, for measuring the experiment parameter after the soil sample loads；Acquisition process unit, including the number of interconnection adopt instrument and computer, and the number adopts instrument for acquiring the experiment parameter, and the computer is for analyzing the experiment parameter.The present invention realizes the high shake frequency load of high frequency dynamic load, and is accurately controlled to low dynamic stress width, obtains higher measurement accuracy, and the present invention also has many advantages, such as to measure reliably, small, simple in structure, easy to make, cost is relatively low.
Description
Technical field
The present invention relates to dynamic load experimental provision technical field more particularly to a kind of small-sized high frequency soil dynamic load experiment dresses
It sets.
Background technology
Traffic loading, mechanical oscillation can generate dynamic load in the soil body of its foundation, its main feature is that cycle-index
More (reaching a thousands of times in service life), stress amplitude are small (generally below 5kPa), and the soil body can under such dynamic loading
Phenomena such as generating pore water pressure rising, soft of soil.
Currently, the experimental provision of laboratory experiment is hydraulic pressure or the native dynamic triaxial apparatus of gear driving mostly, it is characterized in that frequency
Low (generally below 20Hz), low dynamic stress width control is difficult (being generally greater than 5kPa), the high (hydraulic pressure system of operating cost loaded for a long time
The oil sources temperature rise of system) etc., this is very unfavorable for simulating above-mentioned dynamic loading.
Invention content
The technical issues of in the presence of the present invention mainly solution prior art, answers to provide a kind of high and low move of frequency
The small-sized high frequency soil dynamic load experimental provision that the control of power width is simple and operating cost is low.
The above-mentioned technical problem of the present invention is mainly to be addressed by following technical proposals：
Small-sized high frequency soil dynamic load experimental provision provided by the invention comprising：
Electromagnetic vibration generator system includes the vibrating controller and vibration table surface of interconnection；
Model casing, is fixed on the upper surface of the vibration table surface, and the inside of the model casing is placed with soil sample；
Loading unit, pressure are attached to the upper surface of the soil sample；
Determination unit, for measuring the experiment parameter after the soil sample loads；
Acquisition process unit, including the number of interconnection adopt instrument and computer, and the number adopts instrument for acquiring the experiment
Parameter, the computer is for analyzing the experiment parameter.
Further, the loading unit includes pressure cap and counterweight, and the pressure cap pressure is attached to the upper table of the soil sample
Face, and a gap is equipped between the excircle of the pressure cap and the inner wall of the model casing, the counterweight is fixed on described hold
The upper surface of gland.
Further, the counterweight includes multiple counterweight ontologies being overlapped mutually, adjacent two counterweight ontologies it
Between, be fixedly connected by silica gel between the counterweight ontology and the pressure cap.
Further, wire guide is additionally provided on the pressure cap, the wire guide is located at the edge of the pressure cap.
Further, the gap between the excircle of the pressure cap and the inner wall of the model casing is less than 0.5mm.
Further, it is offered into discharge outlet on the lower sides of the model casing.
Further, the determination unit includes acceleration measuring means, hydraulic pressure mensuration mechanism, soil pressure measuring means and position
Shift measurement mechanism,
The acceleration measuring means includes acceleration transducer and magnet base, and the acceleration transducer is fixed on described
On magnet base, the magnet base is installed in the upper surface of the counterweight；
The hydraulic pressure mensuration mechanism includes hydraulic pressure sensor, and the hydraulic pressure sensor is arranged inside the soil sample；
The soil pressure measuring means includes soil pressure case, and the soil pressure case is arranged inside the soil sample；
The displacement measurement mechanism includes laser displacement sensor and bearing, and the bearing is fixed on the bottom of the model casing
Portion, the laser displacement sensor are mounted on the top of the bearing, and the position of the laser displacement sensor and the weight
The position of code is corresponding；
The acceleration transducer, hydraulic pressure sensor, soil pressure case and laser displacement sensor adopt instrument with the number
It is connected.
The beneficial effects of the present invention are：Vibration table surface is driven to generate high-frequency vibration by vibrating controller, and through adding
High frequency dynamic load is applied to soil sample by carrier unit, and then, determination unit measures the experiment parameter after soil sample load, acquisition process list
Member can evaluate influence of the high frequency dynamic load to soil sample mechanical property according to test parameters, and the present invention realizes high frequency live load
The high shake frequency load carried, and low dynamic stress width is accurately controlled, higher measurement accuracy is obtained, and the present invention also has
Measure it is reliable, it is small, simple in structure, easy to make, cost is relatively low the advantages that.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the structural schematic diagram of the small-sized high frequency soil dynamic load experimental provision of the present invention；
Fig. 2 is the experimental result picture of the small-sized high frequency soil dynamic load experimental provision of the present invention；
Fig. 3 is the gross pressure state diagram of the small-sized high frequency soil dynamic load experimental provision of the present invention；
Fig. 4 is the water pressure condition figure of the small-sized high frequency soil dynamic load experimental provision of the present invention.
Specific implementation mode
The preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
As shown in fig.1, the small-sized high frequency soil dynamic load experimental provision of the present invention comprising：
Electromagnetic vibration generator system 1 includes the vibrating controller 11 and vibration table surface 12 of interconnection；In the reality of the present invention
It applies in example, the size of vibration table surface 12 is 0.5m X 0.5m, and maximum vibration frequency is 500Hz, vertical direction peak acceleration
For 2g, load 100kgf, can long time continuous working (24 hours or more), can realize the height of high frequency (100Hz) dynamic load
Shake frequency (more than a thousands of times) loads.
Model casing 2, is fixed on the upper surface of vibration table surface 12, and the inside of model casing 2 is placed with soil sample 3；
Loading unit 4, pressure are attached to the upper surface of soil sample 3；
Determination unit 5, for measuring the experiment parameter after soil sample 3 loads；Test parameters in the present embodiment is hydraulic pressure, soil
Pressure, acceleration and displacement etc..
Acquisition process unit 6, including the number of interconnection adopt instrument 61 and computer 62, number adopt instrument 61 for acquire experiment join
Number, computer 62 is for analyzing experiment parameter.
The present invention drives vibration table surface 12 to generate high-frequency vibration by vibrating controller 11, and will be high through loading unit 4
Frequency dynamic load is applied to soil sample 3, and then, determination unit 5 measures the experiment parameter after soil sample 3 loads, 6 basis of acquisition process unit
Test parameters can evaluate influence of the high frequency dynamic load to 3 mechanical property of soil sample, and the present invention realizes high frequency dynamic load
High shake frequency load, and low dynamic stress width is accurately controlled, higher measurement accuracy is obtained, and the present invention also has measurement
Reliably, the advantages that small, simple in structure, easy to make, cost is relatively low.
Specifically, loading unit 4 includes pressure cap 41 and counterweight 42, and pressure cap 41 presses the upper surface for being attached to soil sample 3, and holds
A gap is equipped between the excircle and the inner wall of model casing 2 of gland 41, counterweight 42 is fixed on the upper surface of pressure cap 41.At this
In the embodiment of invention, the gap between the excircle and the inner wall of model casing 2 of pressure cap 41 is less than 0.5mm, also, model casing
It is offered on 2 lower sides into discharge outlet 21.In the present invention, for drainage test, between 2 side wall of pressure cap 41 and model casing
Gap on can also apply lubriation material, in this way after 3 stress deformation of soil sample, pressure cap 41 can unhinderedly relative model case 2
Sliding downwards, to improve the accuracy of 5 measured data of determination unit.For disdrainage test, pressure cap 41 and model casing 2
Silica gel sealing can be used between side wall.
Specifically, counterweight 42 includes multiple counterweight ontologies 421 being overlapped mutually, between adjacent two counterweight ontologies 421,
It is fixedly connected by silica gel between counterweight ontology 421 and pressure cap 41.In the present invention, load level can pass through increase and decrease
The quantity of counterweight ontology 421 is adjusted, and makes it that can realize that the dynamic load width tune of 0.2-5kPa increases, and to low dynamic stress width
Accurately control (± 50Pa).
In the present invention, it can be connected with acquisition process unit 6 across pressure cap 41 for the conducting wire of determination unit 5, pressure-bearing
Wire guide is additionally provided on lid 41, wire guide is located at the edge of pressure cap 41, can reduce influence of the conducting wire to soil sample 3 in this way.
Specifically, determination unit 5 includes acceleration measuring means 51, hydraulic pressure mensuration mechanism 52,53 and of soil pressure measuring means
Displacement measurement mechanism 54,
Acceleration measuring means 51 includes acceleration transducer 511 and magnet base 512, and acceleration transducer 511 is fixed on
On magnet base 512, magnet base 512 is installed in the upper surface of counterweight 42；Wherein, the measurement range of acceleration transducer 511 is 0-
50g, acceleration transducer 511 are mainly used for measuring the acceleration of counterweight 42.
Hydraulic pressure mensuration mechanism 52 includes hydraulic pressure sensor, and hydraulic pressure sensor is arranged inside soil sample 3；The hydraulic pressure of the present embodiment
The diameter of sensor is less than 7mm；Measurement accuracy is ± 4Pa.
Soil pressure measuring means 53 includes hydraulic pressure sensor, and soil pressure case is arranged inside soil sample 3；The soil pressure of the present embodiment
The diameter of sensor is less than 20mm；Measurement accuracy is ± 5Pa.
Displacement measurement mechanism 54 includes laser displacement sensor 541 and bearing 542, and bearing 542 is fixed on the bottom of model casing 2
Portion, laser displacement sensor 541 are mounted on the top of bearing 542, and the position of the position of laser displacement sensor 541 and counterweight 42
It sets corresponding.Measurement accuracy ± the 0.025mm of laser displacement sensor.
The present invention acceleration transducer 511, hydraulic pressure sensor, soil pressure case and laser displacement sensor 541 with
Number adopts instrument 61 and is connected.
Working principle of the present invention is as follows：
1), before vibration starts, the soil sample 3 made in model casing 2 has generated under the action of pressure cap 41 and counterweight 42
Small deformation, the deformation belong to the deformation under dead weight.
2), the loading method of dynamic load is：Electromagnetic vibration generator system 1 is vibrated by the weight of loading unit 4, and weight is vibrated and is produced
Raw inertia force (high frequency dynamic load) is applied to soil sample 3.The size of dynamic load can be assessed by acceleration transducer 511, in turn
By adjusting the table top vertical vibration acceleration of electromagnetic vibration generator system 1, to control dynamic load in desired extent.
3), measurement method is：Hydraulic pressure sensor, hydraulic pressure sensor and laser displacement sensor measure hydraulic pressure, soil pressure respectively
With the size of displacement (sedimentation).
4), the appraisal procedure of dynamic load effect is：Draining test in, hydraulic pressure, soil pressure average value all keep substantially not
Become, and displacement increases；Influence of the high frequency dynamic load to soil sample mechanical property can be assessed with incremental displacement value.Do not draining experiment
In, hydraulic pressure, soil pressure average value all change, and the average value of displacement is constant；The incrementss of hydraulic pressure, soil pressure average value can be used
Assess influence of the high frequency dynamic load to soil sample mechanical property.
Refering to shown in Fig. 2-4, the disdrainage test result of certain rock-soil material under the irregular wave loading environment of the present invention
In, when vibration number is 60,000 times, the measurement of total stress is less than ± 5Pa, and the measurement error of pore water pressure is less than ± 4Pa.Specifically
Ground, total stress of the invention (σ) can be used following calculation formula and calculated：
Wherein, G is the weight of counterweight and pressure cap；S is the area of pressure cap；A is acceleration.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
The change or replacement expected without creative work, should be covered by the protection scope of the present invention.Therefore, of the invention
Protection domain should be determined by the scope of protection defined in the claims.
Claims (7)
1. a kind of small-sized high frequency soil dynamic load experimental provision, which is characterized in that including：
Electromagnetic vibration generator system includes the vibrating controller and vibration table surface of interconnection；
Model casing, is fixed on the upper surface of the vibration table surface, and the inside of the model casing is placed with soil sample；
Loading unit, pressure are attached to the upper surface of the soil sample；
Determination unit, for measuring the experiment parameter after the soil sample loads；
Acquisition process unit, including the number of interconnection adopt instrument and computer, and the number adopts instrument and is used to acquire the experiment parameter,
The computer is for analyzing the experiment parameter.
2. small-sized high frequency soil dynamic load experimental provision as described in claim 1, which is characterized in that the loading unit includes holding
Gland and counterweight, the pressure cap pressure are attached to the upper surface of the soil sample, and the excircle of the pressure cap and the model casing
Inner wall between be equipped with a gap, the counterweight is fixed on the upper surface of the pressure cap.
3. small-sized high frequency soil dynamic load experimental provision as claimed in claim 2, which is characterized in that the counterweight includes multiple phases
The counterweight ontology being mutually superimposed, between adjacent two counterweight ontologies, logical between the counterweight ontology and the pressure cap
Silica gel is crossed to be fixedly connected.
4. small-sized high frequency soil dynamic load experimental provision as claimed in claim 3, which is characterized in that be additionally provided on the pressure cap
Wire guide, the wire guide are located at the edge of the pressure cap.
5. small-sized high frequency soil dynamic load experimental provision as claimed in claim 4, which is characterized in that the excircle of the pressure cap
Gap between the inner wall of the model casing is less than 0.5mm.
6. small-sized high frequency soil dynamic load experimental provision as claimed in claim 5, which is characterized in that the lower side of the model casing
It is offered on wall into discharge outlet.
7. small-sized high frequency soil dynamic load experimental provision as claimed in claim 6, which is characterized in that the determination unit includes adding
Velocity determination mechanism, hydraulic pressure mensuration mechanism, soil pressure measuring means and displacement measurement mechanism,
The acceleration measuring means includes acceleration transducer and magnet base, and the acceleration transducer is fixed on the magnetic force
On seat, the magnet base is installed in the upper surface of the counterweight；
The hydraulic pressure mensuration mechanism includes hydraulic pressure sensor, and the hydraulic pressure sensor is arranged inside the soil sample；
The soil pressure measuring means includes soil pressure case, and the soil pressure case is arranged inside the soil sample；
The displacement measurement mechanism includes laser displacement sensor and bearing, and the bearing is fixed on the bottom of the model casing,
The laser displacement sensor is mounted on the top of the bearing, and the position of the laser displacement sensor and the counterweight
Position is corresponding；
The acceleration transducer, hydraulic pressure sensor, soil pressure case and laser displacement sensor adopt instrument with the number and are connected
It connects.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810335672.6A CN108362456A (en) | 2018-04-16 | 2018-04-16 | A kind of small-sized high frequency soil dynamic load experimental provision |
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| CN201810335672.6A CN108362456A (en) | 2018-04-16 | 2018-04-16 | A kind of small-sized high frequency soil dynamic load experimental provision |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060565A (en) * | 2018-08-14 | 2018-12-21 | 上海交通大学 | A kind of small-sized high frequency and low stress width soil dynamic triaxial apparatus |
| CN110108792A (en) * | 2019-04-23 | 2019-08-09 | 国家电网有限公司 | A kind of quick detection device of soil-stone material frequency-response characteristic and method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109060565A (en) * | 2018-08-14 | 2018-12-21 | 上海交通大学 | A kind of small-sized high frequency and low stress width soil dynamic triaxial apparatus |
| CN110108792A (en) * | 2019-04-23 | 2019-08-09 | 国家电网有限公司 | A kind of quick detection device of soil-stone material frequency-response characteristic and method |
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