CN107796279A - The method of flexible loading plate load test test foundation soil deformation modulus - Google Patents

The method of flexible loading plate load test test foundation soil deformation modulus Download PDF

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Publication number
CN107796279A
CN107796279A CN201711096362.5A CN201711096362A CN107796279A CN 107796279 A CN107796279 A CN 107796279A CN 201711096362 A CN201711096362 A CN 201711096362A CN 107796279 A CN107796279 A CN 107796279A
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China
Prior art keywords
loading plate
mrow
air bag
foundation soil
test
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CN201711096362.5A
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Inventor
许年春
黄伟
吴同情
赵宝云
况龙川
吴越
李东升
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Chongqing University of Science and Technology
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Chongqing University of Science and Technology
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Priority to CN201711096362.5A priority Critical patent/CN107796279A/en
Publication of CN107796279A publication Critical patent/CN107796279A/en
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/02—Measuring arrangements characterised by the use of mechanical techniques for measuring length, width or thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
    • G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
    • 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
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a kind of method of the higher flexible loading plate load test test foundation soil deformation modulus of measuring accuracy, prepare loading plate, before test, one air bag in rectangular-shape with pump gas hole is installed in loading plate bottom, form flexible loading plate, loading plate is provided with the first displacement measuring device for being used for measuring loading plate sedimentation value, and a second displacement measurement apparatus for being used to measure balloon thickness changing value is installed in air bag；Apply a vertical pressure P during test on loading plate, simultaneously by pump gas hole to pump gas in air bag, produce air pressure p, vertical pressure P is set to meet P=A × p with air pressure p in air bag, air bag bottom surface is set to be bonded with foundation soil surface, A represents capsule floor space, the sedimentation value s that the first displacement measuring device is measured in formula1The balloon thickness changing value s measured with second displacement measurement apparatus2It is added as the sedimentation value s at the center of flexible loading plate bottom, foundation soil deformation modulus E is calculated in conjunction with other specification0。

Description

The method of flexible loading plate load test test foundation soil deformation modulus
Technical field
It is specifically a kind of to be replaced using flexible loading plate the present invention relates to a kind of foundation soil deformation modulus method of testing Rigid bearing plate, carry out load test, test out the new method of foundation soil deformation modulus.
Background technology
Foundation soil deformation modulus E0The sedimentation and deformation on basis is decide, can be sent out between building superstructure, basis and ground Raw interaction, basic sedimentation and deformation can also have an impact to the stress on basis and superstructure, therefore E0To basic and upper The design of portion's structure is all particularly significant.Foundation soil deformation modulus E0Obtained by plate, at present, plate Loading plate used is rigid bearing plate, and rigid bearing plate has very big bending rigidity relative to foundation soil, in vertical load Effect lower plate bottom remains plane, plate bottom actual stress complex distribution, is calculating E0When assume plate bottom stress be uniformly distributed, and Introduce a uniform settlement coefficient, the E thus calculated0In the presence of certain deviation.Accurately to test out foundation soil deformation modulus E0 Rigid bearing plate need to be replaced using flexible loading plate, carries out load test.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of higher flexibility carrying of measuring accuracy is onboard The method of lotus experimental test foundation soil deformation modulus,
The object of the present invention is achieved like this：
A kind of method of flexible loading plate load test test foundation soil deformation modulus,
Loading plate includes plate body and is arranged on the bearing for being used to transmit vertical pressure of plate body upper end, before test, in length An air bag in rectangular-shape with pump gas hole is installed in square plate body bottom, forms flexible loading plate, the air bag Upper surface, the shape of lower surface is identical with the shape of plate body and corresponds to installation, is provided with plate body upper end and is sunk for measuring loading plate First displacement measuring device of depreciation, a second for being used to measure balloon thickness changing value is installed inside air bag center Measuring system；
Apply a vertical pressure P during test on loading plate, while air pressure is produced to pump gas in air bag by pump gas hole P, vertical pressure P is met P=A × p with air pressure p in air bag, air bag bottom surface is bonded with foundation soil surface, A represents capsule in formula Floor space, the sedimentation value s that the first displacement measuring device is measured1Become with the balloon thickness that second displacement measurement apparatus is measured Change value s2It is added as the sedimentation value s at the center of flexible loading plate bottom, with reference to air pressure p, substitutes into formula：
Calculate foundation soil deformation modulus E0, b is loading plate width in formula, and μ is foundation soil Poisson's ratio, and ω is for sedimentation Number；ω acts on lower vertical vibration formula according to Bu Xinnaisike concentrated forces and integrates to obtain, and the vertical displacement of capsule bottom center is accumulated Point, it can obtain ω calculation formula：
L is loading plate length in formula.
Preferentially, the material of the air bag utricule is carbon cloth, and flexible waterproof coating is applied in utricule.
Preferentially, the height in space is 3-5cm in the air bag.
Preferentially, the second displacement measurement apparatus uses inductive displacement transducer, measurement accuracy 0.01mm.
Preferentially, first displacement measuring device uses dial gauge, and the dial gauge measurement end is adjacent with bearing, and with The upper surface of loading plate, the other end of the dial gauge are fixed on the liptinite of loading plate side setting.
By adopting the above-described technical solution, the present invention has the advantages that：
Because intracapsular air pressure is equal everywhere, what flexible loading plate applied to foundation soil surface is a uniform vertical stress, Calculating foundation soil deformation modulus E0When, sedimentation coefficient ω is obtained (and such without capture rigid bearing plate by strictly integrating Take uniform settlement coefficient), it is any it is assumed that the E calculated due to not making0Accuracy can be protected.Meanwhile held with rigidity Support plate is compared, and flexible loading plate load test does not increase how many cost, can receive completely in terms of testing efficiency.
Brief description of the drawings
Fig. 1 is the scheme of installation of each part in test process of the present invention；
Fig. 2 is the force schematic diagram of vertical pressure.
Reference
In accompanying drawing, 1 is loading plate, and 2 be plate body, and 3 be air bag, and 4 be bearing, and 5 be pump gas hole, and 6 be second displacement sensor, 7 be the first displacement transducer.
Embodiment
A kind of method of flexible loading plate load test test foundation soil deformation modulus,
Referring to Fig. 1, loading plate includes plate body (steel plate) and is arranged on the branch for being used to transmit vertical pressure of plate body upper end Seat, before test, an air bag in rectangular-shape with pump gas hole is installed in rectangular plate body bottom, forms flexible carrying Plate, the height in space is 3-5cm in the air bag.The material of the air bag utricule is carbon cloth, and flexible water is applied in utricule Coating.The upper surface of the air bag, the shape of lower surface are identical with the shape of plate body and correspond to installation, are provided with and use in plate body upper end In the first displacement measuring device of measurement loading plate sedimentation value, it may be preferable that first displacement measuring device uses dial gauge, institute State that dial gauge measurement end is adjacent with bearing, and carrying is fixed on the upper surface of loading plate, the other end of the dial gauge On the liptinite that plate side is set.One second displacement for being used to measure balloon thickness changing value is installed inside air bag center Measurement apparatus；The second displacement measurement apparatus uses inductive displacement transducer, measurement accuracy 0.01mm, stability is high, It is cheap.
Apply a vertical pressure P on loading plate referring to Fig. 2, during test, while by pump gas hole to pump gas in air bag, Air pressure p is produced, vertical pressure P is met P=A × p with air pressure p in air bag, air bag bottom surface is bonded with foundation soil surface, in formula A represents capsule floor space, and as shown in Figure 2, so control can ensure that flexible loading plate bottom all closely connects with foundation soil surface Touch.(note：When p is less than normal, show to assume responsibility for excessive pressure at the bearing of air bag corner, should by inflator toward pump gas in air bag come Increase air pressure, when p is bigger than normal, show that capsule bottom is not fully pressed against on foundation soil, air pressure should be reduced by button deflation.) will The sedimentation value s that first displacement measuring device is measured1The balloon thickness changing value s measured with second displacement measurement apparatus2It is added As the sedimentation value s at the center of flexible loading plate bottom, with reference to air pressure p, formula is substituted into：
Calculate foundation soil deformation modulus E0, b is loading plate width in formula, and μ is foundation soil Poisson's ratio, and ω is for sedimentation Number；ω acts on lower vertical vibration formula according to Bu Xinnaisike concentrated forces and integrates to obtain, and the vertical displacement of capsule bottom center is accumulated Point, it can obtain ω calculation formula：
L is loading plate length in formula.
This method realizes that step is as follows：
The first step：Flexible loading plate is placed in foundation soil surface；
Second step：By force application apparatus (jack) apply vertical pressure P, while by pump gas hole into air bag pump gas, Air pressure p is set in vertical pressure P and air bag to meet P=A × p, A represents capsule floor space in formula, makes air bag bottom surface and foundation soil surface It is bonded, capsule floor space does not change in test process, can use Application No.：201610122281.7 scheme make；
3rd step：Read respectively under different air pressure p, the loading plate upper surface sedimentation value that the first displacement measuring device tests out s1The balloon thickness changing value s tested out with second displacement measurement apparatus2, calculate s=s1+s2；
4th step：The length l of flexible loading plate 1, width b are substituted into formula (2) and calculate ω, with reference to known Poisson's ratio μ, P, s are substituted into formula (1) and calculate foundation soil deformation modulus E0。
Concrete example：In certain foundation soil load test, using flexible loading plate length l=0.43m, width b= 0.25m, l/b=1.72, formula (2) integration can obtain ω=1.440, foundation soil Poisson's ratio μ=0.30, and air pressure p takes air pressure increment 7.5kPa, s take the average value 0.384mm of settlement increment, substitute into formula (1) and calculate E0=6.41MPa.Using the square rigidity of 0.4m Loading plate carries out load test on identical foundation soil surface, and ω takes rigid bearing plate plate uniform settlement coefficient, for square plate ω =0.886, plate bottom average pressure increment 7.5kPa, average settlement increment 0.336mm, calculate E0=7.21MPa.It can be seen that rigidity The E that loading plate tests out0The E tested out than rigid bearing plate0Bigger than normal 12.5%, again show that rigidity is held using finite element modelling The E that support plate tests out0Actual value (i.e. finite element modelling input value) bigger than normal more than 10%, therefore can obtain using flexible loading plate E0Exact value.
Finally illustrate, preferred embodiment above is merely illustrative of the technical solution of the present invention and unrestricted, although logical Cross above preferred embodiment the present invention is described in detail, it is to be understood by those skilled in the art that can be Various changes are made to it in form and in details, without departing from claims of the present invention limited range.

Claims (5)

  1. A kind of 1. method of flexible loading plate load test test foundation soil deformation modulus, it is characterised in that：
    Loading plate includes plate body and is arranged on the bearing for being used to transmit vertical pressure of plate body upper end, before test, in rectangle Plate body bottom install one have pump gas hole the air bag in rectangular-shape, form flexible loading plate, the upper table of the air bag Face, the shape of lower surface is identical with the shape of plate body and corresponds to installation, is provided with plate body upper end and is used to measure loading plate sedimentation value The first displacement measuring device, inside air bag center install one be used for measure balloon thickness changing value second displacement survey Measure device；
    Apply a vertical pressure P during test on loading plate, while is produced by air pressure p, is made for pump gas in air bag by pump gas hole Vertical pressure P meets P=A × p with air pressure p in air bag, air bag bottom surface is bonded with foundation soil surface, and A represents capsule bottom surface in formula Product, the sedimentation value s that the first displacement measuring device is measured1The balloon thickness changing value measured with second displacement measurement apparatus s2It is added as the sedimentation value s at the center of flexible loading plate bottom, with reference to air pressure p, substitutes into formula：
    <mrow> <msub> <mi>E</mi> <mn>0</mn> </msub> <mo>=</mo> <mfrac> <mrow> <mi>p</mi> <mi>b</mi> <mrow> <mo>(</mo> <mn>1</mn> <mo>-</mo> <msup> <mi>&amp;mu;</mi> <mn>2</mn> </msup> <mo>)</mo> </mrow> </mrow> <mi>s</mi> </mfrac> <mi>&amp;omega;</mi> </mrow>
    Calculate foundation soil deformation modulus E0, b is loading plate width in formula, and μ is foundation soil Poisson's ratio, and ω is sedimentation coefficient；ω roots Lower vertical vibration formula is acted on according to Bu Xinnaisike concentrated forces to integrate to obtain, and the vertical displacement of capsule bottom center is integrated, can be obtained To ω calculation formula：
    <mrow> <mi>&amp;omega;</mi> <mo>=</mo> <mfrac> <mn>2</mn> <mi>&amp;pi;</mi> </mfrac> <mrow> <mo>(</mo> <msubsup> <mo>&amp;Integral;</mo> <mn>0</mn> <mrow> <mi>arctan</mi> <mi>l</mi> <mo>/</mo> <mi>b</mi> </mrow> </msubsup> <mfrac> <mn>1</mn> <mrow> <mi>cos</mi> <mi>&amp;theta;</mi> </mrow> </mfrac> <mi>d</mi> <mi>&amp;theta;</mi> <mo>+</mo> <mfrac> <mi>l</mi> <mi>b</mi> </mfrac> <msubsup> <mo>&amp;Integral;</mo> <mn>0</mn> <mrow> <mi>arctan</mi> <mi>b</mi> <mo>/</mo> <mi>l</mi> </mrow> </msubsup> <mfrac> <mn>1</mn> <mrow> <mi>cos</mi> <mi>&amp;theta;</mi> </mrow> </mfrac> <mi>d</mi> <mi>&amp;theta;</mi> <mo>)</mo> </mrow> </mrow>
    L is loading plate length in formula.
  2. 2. a kind of method of flexible loading plate load test test foundation soil deformation modulus according to claim 1, it is special Sign is：The material of the air bag utricule is carbon cloth, and flexible waterproof coating is applied in utricule.
  3. 3. a kind of method of flexible loading plate load test test foundation soil deformation modulus according to claim 1, it is special Sign is：The height in space is 3-5cm in the air bag.
  4. 4. a kind of method of flexible loading plate load test test foundation soil deformation modulus according to claim 3, it is special Sign is：The second displacement measurement apparatus uses inductive displacement transducer, measurement accuracy 0.01mm.
  5. 5. a kind of method of flexible loading plate load test test foundation soil deformation modulus according to claim 1, it is special Sign is：First displacement measuring device uses dial gauge, and the dial gauge measurement end is adjacent with bearing, and with loading plate Upper surface, the other end of the dial gauge are fixed on the liptinite of loading plate side setting.
CN201711096362.5A 2017-11-09 2017-11-09 The method of flexible loading plate load test test foundation soil deformation modulus Withdrawn CN107796279A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110241869A (en) * 2019-07-15 2019-09-17 重庆科技学院 A kind of foundation bearing capacity plate dynamic loading experiment device and method
CN112525053A (en) * 2020-12-02 2021-03-19 中国人民解放军63926部队 Collapse escape air bag ring bearing deformation testing device and method
CN112681179A (en) * 2020-12-17 2021-04-20 东南大学 Pavement structure stress detection and maintenance early warning method based on intelligent particle structure
CN113587898A (en) * 2021-07-22 2021-11-02 中冶集团武汉勘察研究院有限公司 Method for determining settlement correction coefficient of soft soil area

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1055405A (en) * 1991-05-09 1991-10-16 冶金工业部建筑研究总院 The dynamic measuring method of foundation deformation modulus and bearing capacity
CN103334418A (en) * 2013-07-12 2013-10-02 杨光华 Novel method for determining foundation bearing force
CN105714754A (en) * 2016-03-04 2016-06-29 重庆科技学院 Method for manufacturing airbag for plate loading test of foundation

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1055405A (en) * 1991-05-09 1991-10-16 冶金工业部建筑研究总院 The dynamic measuring method of foundation deformation modulus and bearing capacity
CN103334418A (en) * 2013-07-12 2013-10-02 杨光华 Novel method for determining foundation bearing force
CN105714754A (en) * 2016-03-04 2016-06-29 重庆科技学院 Method for manufacturing airbag for plate loading test of foundation

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
许年春等: "土变形模量的柔性承载板测试研究", 《岩土力学》 *

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110241869A (en) * 2019-07-15 2019-09-17 重庆科技学院 A kind of foundation bearing capacity plate dynamic loading experiment device and method
CN110241869B (en) * 2019-07-15 2023-12-01 重庆科技学院 Device and method for testing dynamic load of foundation bearing capacity flat plate
CN112525053A (en) * 2020-12-02 2021-03-19 中国人民解放军63926部队 Collapse escape air bag ring bearing deformation testing device and method
CN112681179A (en) * 2020-12-17 2021-04-20 东南大学 Pavement structure stress detection and maintenance early warning method based on intelligent particle structure
CN112681179B (en) * 2020-12-17 2022-04-15 东南大学 Pavement structure stress detection and maintenance early warning method based on intelligent particle structure
CN113587898A (en) * 2021-07-22 2021-11-02 中冶集团武汉勘察研究院有限公司 Method for determining settlement correction coefficient of soft soil area
CN113587898B (en) * 2021-07-22 2023-02-28 中冶集团武汉勘察研究院有限公司 Method for determining settlement correction coefficient of soft soil area

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