CN107907160A - A kind of method for measuring traditional building inside soil body ess-strain - Google Patents
A kind of method for measuring traditional building inside soil body ess-strain Download PDFInfo
- Publication number
- CN107907160A CN107907160A CN201711105857.XA CN201711105857A CN107907160A CN 107907160 A CN107907160 A CN 107907160A CN 201711105857 A CN201711105857 A CN 201711105857A CN 107907160 A CN107907160 A CN 107907160A
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- Prior art keywords
- rubber bar
- soil body
- foil gauge
- strain
- rubber
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/16—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge
- G01B7/18—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring the deformation in a solid, e.g. by resistance strain gauge using change in resistance
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
The present invention relates to a kind of method for measuring building inside soil body ess-strain, including rubber bar is chosen, rubber bar is cut along longitudinal direction；Foil gauge is placed on to the middle part of polishing wiping rubber bar；With hot melt adhesive closure foil gauge；By the other half rubber bar alignment be pressed on the rubber bar of closure layer, it is to be pasted firmly after, foil gauge connection lead be laterally pierced by from adhesive rubber rod；Foil gauge rubber bar will be enclosed with individually to be embedded in the soil body；During long-term stress strain monitoring, foil gauge rubber bar will be enclosed with and fill in PCV pipes, filling loosened soil buries rubber stopper in pvc pipe；The lead connection number collector of foil gauge connection carries out data acquisition.The present invention is easy to operate, and using convenient, low cost, scene is had a wide range of applications in measurement inside soil body ess-strain.
Description
Technical field
The present invention relates to earthen ruins protection test research and protection field of reinforcement, belong to earthen ruins inside soil body stress measurement
Important method, mainly for ruins body due to dehydration drying shrinkage, consolidation settlement, vapor transport, salinity crystallization, rainfall snowfall oozes
Water expansion, ambient temperature and humidity change and cause the measuring method of soil body deformation.This method can also be applied to the phases such as geotechnical engineering
Pass field.
Background technology
The Xinjiang in NORTHWEST CHINA area, Gansu, many ancient times earthen ruins of the domestic remnants in Ningxia and Shaanxi, northern length of wriggling
City, pass city, beacon flint on the vastness gobi of northwest, the friendship river in Xinjiang, Gao Chang, Lou Lan, Niya Ruins, be up and down it is thousands of every year,
In length and breadth in ten thousand, spread all over China.These earthen ruins are with a long history, and some has been cited as world cultural heritage, have very high science to grind
Study carefully and archaeological significance.For the existing many effective methods of deformation research outside earthen ruins, but for ruins inside soil body
Stress variation never has feasible measuring method.However, environmental change can influence inside soil body stress variation, these stress become
Change also by multifactor impacts such as ruins scale, form, soil mass properties.Ruins inside soil body stress variation is to cause soil body macroscopic view disease
The preliminary form of expression become, therefore, research measure distress mechanism and preventive protection of the stress variation to ruins of inside soil body
Research is respectively provided with highly important meaning.At present, the method and apparatus that can not use for reference can also accurately characterize soil body shape
The microscopic feature of change.
Resistance strain measurement method is a kind of most commonly used method in Analysis of Experimental Stress.This method is to use strain sensitive
Element measures the surface strain of component, the stress state of component surface is obtained further according to strain-stress relation, so as to component
Carry out stress analysis.Foil gauge applies surface in hard materials such as reinforcing bar, rocks using very ripe, and in inside soil body
Embedding strain sensor（Foil gauge）Face many difficulties.Foil gauge is embedded in the soil body and is contacted with the soil body, water pair in the soil body
The influence of foil gauge is big, and fragile, and that temperature-compensating etc. is carried out during long-term stress strain monitoring in the soil body is equal for foil gauge
It is the problem for needing to solve.Therefore, study a kind of strong applicability, measurement is convenient, and can accurate characterization inside soil body stress should
It is particularly significant for earthen ruins protection to become measuring method and equipment.
The content of the invention
In order to measure traditional building inside soil body ess-strain, characterization is tested not especially in traditional handicraft building wall
With the deformation of state.The purpose of the present invention has been directed to a kind of method for measuring traditional building inside soil body ess-strain, leads to
The measurement of inside soil body ess-strain can be realized by crossing this measuring method.
The purpose of the present invention is be achieved through the following technical solutions：
A kind of method for measuring traditional building inside soil body ess-strain, its step include：
A. the rubber bar that low-elasticity-modulus amount is E=0.007~0.008GPa, its length diameter 7mm, length 60mm, by its edge are chosen
Longitudinal direction segmentation is divided into two partly；
B. rubber bar wherein half surface polishing is wiped, foil gauge is transversely pasted onto to the middle part of rubber bar burnishing surface；
C. then, the rapid closure of one side hot melt adhesive of foil gauge will be pasted, melten gel parcel foil gauge, then by the other half rubber
Rod alignment is pressed on the rubber bar of closure layer, it is to be pasted firmly after, edge is cut it is neat, the lead being connected with foil gauge from
The rubber bar of bonding is laterally pierced by；
D. foil gauge rubber bar will be enclosed with individually to be embedded in the soil body, or be embedded in X, the form of tri- directional combinations of Y, Z
In the soil body；
When long-term stress strain monitoring is e. carried out in the soil body, temperature-compensating plate is added, foil gauge rubber bar plug will be enclosed with
Into pvc pipe, filling loosened soil buries rubber bar in pvc pipe；
F. the soil body is more loose or when rubber bar contacts poor with the soil body, can add fixed plug in rubber bar two ends；
G. the lead connection number collector that foil gauge is connected carries out data acquisition, for more slow soil deformation, foil gauge
Sample frequency is 1/300Hz, and the deformation produced for vibration and instantaneous external force to the soil body, foil gauge sample frequency is more than
1000Hz。
Advantage of the present invention and the beneficial effect produced are：
（1）The rubber bar elasticity modulus that the present invention uses is small, and plastic-less deformation, can pass to deformation when the soil body deforms upon
Foil gauge, drives foil gauge to stretch, so as to measure the deformation of the soil body.
（2）Rubber bar has certain waterproof, anticorrosion, the effect of anti-external impacts, can adapt to Various Complex soil body bar
Inside soil body stress-strain measurement under part.
（3）Present invention could apply to soil body dehydration drying shrinkage, consolidation settlement, vapor transport, capillary water rising, salinity knot
The measurement for the small strain that the factors such as crystalline substance, rainfall snowfall, humiture change produce for a long time.
（4）Present invention could apply to vibrate and the lower instantaneous stress strain measurement of external force effect, under impact force action
Stress-strain measurement can still be played.
（5）The measuring instrument is easy to operate, using convenient, low cost, has in measurement inside soil body ess-strain extensive
Application scenarios.
Brief description of the drawings
Fig. 1 is schematic cross-sectional view of the present invention.
Fig. 2 is inside soil body temperature-compensating plate schematic diagram of the present invention.
Embodiment
The present invention is further described again below in conjunction with the accompanying drawings：
A kind of method for measuring traditional building inside soil body ess-strain, its step include：
（1）Choose the rubber bar 1 that low-elasticity-modulus amount is E=0.007~0.008GPa, its length diameter 7mm, length 60mm, by its edge
Longitudinal direction segmentation is divided into two partly；
（2）The wherein half surface polishing of rubber bar 1 is wiped, foil gauge 3 is pasted onto in 1 burnishing surface of rubber bar along longitudinal direction
Portion；
（3）Then, the rapid closure of one side hot melt adhesive of foil gauge 3 will be pasted, melten gel parcel foil gauge 3, then by the other half rubber
The alignment of glue stick 1 is pressed on the rubber bar 1 of closure layer, it is to be pasted firmly after, edge is cut neat, is connected with foil gauge 3
Lead is laterally pierced by from 1 bonding place of rubber bar；
（4）Foil gauge rubber bar will be enclosed with individually to be embedded in the soil body 2, or it is embedding with X, the form of tri- directional combinations of Y, Z
In the soil body 2；
（5）When long-term stress strain monitoring is carried out in the soil body 1, temperature-compensating plate is added, foil gauge rubber bar will be enclosed with
Pvc pipe 4 is filled in, filling loosened soil buries rubber bar 1 in pvc pipe；
（6）The soil body 2 is more loose, or when rubber bar 1 contacts poor with the soil body 2, can add fixation in 1 two ends of rubber bar
Plug；
（7）The lead connection number collector that foil gauge 3 connects carries out data acquisition, for more slow soil deformation, strain
3 sample frequency of piece is 1/300Hz, and the deformation produced for vibration and instantaneous external force to the soil body, 3 sample frequency of foil gauge is more than
1000Hz。
The present invention buries rubber bar 1 in the soil body 2, and foil gauge 3 is pasted among rubber bar 1, and experiment finds that the soil body becomes
Shape can drive rubber bar deformation more actually to pass to foil gauge 3, drive foil gauge to stretch, so as to meet soil body microstrain
Deformation data gathers.
The practical distortion of the soil body can be expressed by the following formula：
σ=E1ε1
σ=E2ε2
In formula：E1- represent rubber bar elasticity modulus, E1=0.011-0.012GPa
ε1- represent rubber bar deformation quantity
E2- represent soil body natural resiliency modulus, E2=0.004~0.018GPa.
ε2The deformation quantity of-expression soil body oneself state
According to above formula calculate the soil body be affected by temperature, severe earthquake action, the deformation for ramming the soil body under effect of vibration, rubber bar 1 with X,
Tri- directions of Y, Z draw X respectively, and tri- direction inside soil body ess-strain values of Y, Z are specific as follows：
Influenced by temperature change, daytime, soil temperature raised 0.1 DEG C, and time about 5-15min, the rubber bar 1 measured produces micro-
Should be altered an agreement 1-3 μ ε, E1=0.011-0.012GPa, its σ=E1 1=11~36Pa of ε, under elastic condition, between internal each particle
In equilibrium state, internal force balance suffered by each particle, i.e. E1ε1=E2ε2, wherein E2=0.004~0.018GPa, then ε2= E1ε1/
E2=0.5~2.75 μ ε, the i.e. deformation of the soil body are 0.5~2.75 μ ε, and rubber bar 1 is in soil body X, tri- direction inside soil bodies of Y, Z
Strain almost identical.
By shock effect, ram the external force function influences such as vibration.For soil deformation caused by severe earthquake action, cycle
It is often shorter, according to measured data from paving soil gradually compacting during, its cycle generally between 0.004~0.011s, because
This, for ramming vibration, geological process and instantaneous external force should be greater than the deformation sample frequency that the soil body produces to be equal to 1000Hz,
The deformation data collection of soil body microstrain can just be fully met.The soil body measures 0~400 μ of rubber bar microstrain before destruction
ε, E1=0.011-0.012GPa, its σ=E1ε1=0~4.8KPa, wherein E2=0.004~0.018GPa, it is interior under elastic condition
Equilibrium state, internal force balance suffered by each particle, i.e. E are between each particle in portion1ε1=E2ε2, ε2= E1ε1/ E2=0~267 μ ε；
Transient vibration impact force microstrain measurement range 0-1500 μ ε, σ=E1ε1=0~18Kpa, ε2= E1ε1/ E2=0~1000 μ ε.
Temperature-compensating corrects, it is necessary to which set temperature compensation is logical when continuous measurement and temperature have more apparent change for a long time
Road, foil gauge 3 use 1/4 bridge or the half-bridge mode of connection, and compensation passage foil gauge need to be placed in protection sleeve pipe, and fills loosened soil pressure
It is real.
When temperature change is more violent, the clear and definite situation of the direction of motion, Impact direction, its inside soil body stress is every
The opposite sex, it is more prominent often to show as a direction.Therefore, the survey that can be laid soil body difference unwrapping wire according to being actually needed and strain
Examination.
This method is applicable not only to the demand of research and the protection of ancient times earth construction site, is also applied for other geotechnical engineerings
Etc. association area.
Claims (1)
1. a kind of method for measuring traditional building inside soil body ess-strain, its step include：
A. the rubber bar that low-elasticity-modulus amount is E=0.007~0.008GPa is chosen（1）, its length diameter 7mm, length 60mm, by it
It is divided into two partly along longitudinal direction segmentation；
B. by rubber bar（1）Wherein half surface polishing wipes, by foil gauge（3）Rubber bar is pasted onto along longitudinal direction（1）It is smooth
The middle part in face；
C. then, foil gauge will be pasted（3）The rapid closure of one side hot melt adhesive, melten gel parcel foil gauge（3）, then will be another
The alignment of half rubber bar is pressed on the rubber bar of closure layer Face to face, it is to be pasted firmly after, edge is cut it is neat, with strain
Piece（3）The lead of connection is laterally pierced by from adhesive rubber rod；
D will be enclosed with foil gauge rubber bar and individually be embedded in the soil body（2）In, or buried with X, the form of tri- directional combinations of Y, Z
Put in the soil body（2）In；
When long-term stress strain monitoring is e. carried out in the soil body, temperature-compensating plate is added, foil gauge rubber bar plug will be enclosed with
Managed into PCV（4）, the interior filling loosened soil burial rubber bar of pvc pipe；
F. the soil body（2）More loose or rubber bar（1）With the soil body（2）When contacting poor, it can be added in rubber bar two ends solid
Fixed plug；
G. foil gauge（3）The lead connection number collector of connection carries out data acquisition, should for more slow soil deformation
Become piece（3）Sample frequency is 1/300Hz, the deformation produced for vibration and instantaneous external force to the soil body, foil gauge（3）Sampling frequency
Rate is more than 1000Hz.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711105857.XA CN107907160A (en) | 2017-11-10 | 2017-11-10 | A kind of method for measuring traditional building inside soil body ess-strain |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711105857.XA CN107907160A (en) | 2017-11-10 | 2017-11-10 | A kind of method for measuring traditional building inside soil body ess-strain |
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| Publication Number | Publication Date |
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| CN107907160A true CN107907160A (en) | 2018-04-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109839313A (en) * | 2019-03-08 | 2019-06-04 | 敦煌研究院 | A kind of full size rammed earth test wall root sapping process stress characterizing method |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204085568U (en) * | 2014-09-12 | 2015-01-07 | 甘肃岩之韵工程勘察设计有限公司 | A kind of slope soil of monitoring automatically ess-strain device |
| CN104748664A (en) * | 2015-03-13 | 2015-07-01 | 南华大学 | Rock-soil mass interior displacement measuring system |
| CN105115634A (en) * | 2015-08-17 | 2015-12-02 | 青岛理工大学 | Cylindrical annular strain soil pressure sensor and measuring method |
-
2017
- 2017-11-10 CN CN201711105857.XA patent/CN107907160A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN204085568U (en) * | 2014-09-12 | 2015-01-07 | 甘肃岩之韵工程勘察设计有限公司 | A kind of slope soil of monitoring automatically ess-strain device |
| CN104748664A (en) * | 2015-03-13 | 2015-07-01 | 南华大学 | Rock-soil mass interior displacement measuring system |
| CN105115634A (en) * | 2015-08-17 | 2015-12-02 | 青岛理工大学 | Cylindrical annular strain soil pressure sensor and measuring method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109839313A (en) * | 2019-03-08 | 2019-06-04 | 敦煌研究院 | A kind of full size rammed earth test wall root sapping process stress characterizing method |
| CN109839313B (en) * | 2019-03-08 | 2023-12-26 | 敦煌研究院 | Full-scale ramming soil test wall root undercut process stress characterization method |
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