CN104749048A - Method for detecting shearing strength of interlayer bonding surface of rock filled concrete of constructional engineering - Google Patents
Method for detecting shearing strength of interlayer bonding surface of rock filled concrete of constructional engineering Download PDFInfo
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- CN104749048A CN104749048A CN201510099922.7A CN201510099922A CN104749048A CN 104749048 A CN104749048 A CN 104749048A CN 201510099922 A CN201510099922 A CN 201510099922A CN 104749048 A CN104749048 A CN 104749048A
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Abstract
The invention provides a method for detecting the shearing strength of an interlayer bonding surface of rock filled concrete of constructional engineering. After a test piece is manufactured through excavation in a rock filled concrete dam or foundation of the constructional engineering, vertical loading and horizontal loading are applied to the test piece gradually and respectively, the linear regression coefficient is determined according to the computational formulas of normal stress and shearing strength on a shearing surface, and the shearing strength of the interlayer bonding surface of the rock filled concrete dam can be calculated. According to the method, the test piece is excavated on a structural member entity, the test piece is subjected to shearing strength test by a jack, force applied to the test piece is pure shearing force, the concrete failure surface is consistent to the direction of the anti-shearing force, the influence factors in a testing process are reduced, the testing precision is improved and the testing process is simple and easy.
Description
Technical field
The invention belongs to field of engineering building, relate to the detection method of a kind of rock-mounded concrete dam Coating combination face shearing strength.
Background technology
In the engineerings such as water conservancy and hydropower dam body, complicated structures and foundation, rock-fill concrete is more and more extensive as the use of filling material.Rock-fill concrete utilizes that the height of self-compacting concrete flows, resistant to separation performance is good and from the feature of flowing, random filling self-compacting concrete in the block stone that particle diameter is larger and the rock-fill concrete body that formed.It has the features such as the volume stability that cement consumption is few, aquation temperature rise is little, integrated cost is low, speed of application is fast, good.Wherein, the performance impact of shearing strength at intersection ability to rock-fill concrete is very significant, is one of major control index of construction quality.Therefore, for ensureing dam shearing strength, meeting associated specifications, needing to detect rock-mounded concrete dam Coating combination face shearing strength.
The method of testing that concrete for hydraulic structure shearing resistance intensity is commonly used is SL352-2006, " concrete for hydraulic structure testing regulations " suggestion measures the shearing strength of concrete and concrete and other materials faying face with concrete shear test instrument, but the method can only in shop experiment, and general for small-size test piece.And rock-fill concrete coarse aggregate minimum grain size used is not less than 300mm, the test specimen length needed for shear test is all not less than 900mm, and the sample dimensions of required test is comparatively large, and existing Experimental Method in Laboratory is difficult to the shearing strength detecting rock-fill concrete.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides a kind of test accurately, the detection method of the rock-mounded concrete dam Coating combination face shearing strength of outdoor convenient test.
In order to realize foregoing invention object, technical scheme of the present invention is as follows:
The detection method of a kind of construction work rock-fill concrete Coating combination face shearing strength, it is characterized in that: after the rock-mounded concrete dam of construction work or base make test specimen by excavation, test specimen applies vertical load and horizontal load respectively step by step, again according to the computing formula of the normal stress on shear surface and shear stress, determine linear regression coeffficient, calculate the shearing strength in the Coating combination face of this rock-mounded concrete dam or base, detecting step is as follows:
(1) test specimen makes: on tested rock-mounded concrete dam or rock-fill concrete base, make the test specimen being no less than 5;
(2) clock gauge is installed: in the horizontal direction and vertical direction of each detection test specimen, be all symmetrically installed with 4 clock gauges, detect horizontal distortion and the vertical deformation of test specimen respectively;
(3) lifting jack is installed: respectively lifting jack is installed detecting on the surface level of test specimen and vertical plane, for the load of the load and vertical direction that apply horizontal direction;
(4) apply vertical load: apply vertical load step by step, observe the clock gauge on vertical plane, when the difference of double vertical deformation is no more than 1%mm, stops applying vertical load, read vertical load P;
(5) horizontal load is applied: apply horizontal load step by step, clock gauge numerical value on reading horizontal face, when the horizontal distortion that added horizontal load causes exceed previous stage load cause more than 1.5 times of distortion time, off-loading applies, until cut off, reading horizontal load Q;
(6) all the other test specimens repeat above-mentioned steps (2) successively to (5), until complete the detection of whole test specimen;
(7) calculate: the computing formula of the normal stress on vertical plane is σ=P/A: the computing formula of the shear stress on shear surface is: τ=Q/A, draws the computing formula of the Coating combination face shearing strength of rock-mounded concrete dam or base:
τ＝aσ+b
In formula: σ-normal stress MPa; P-vertical load N; τ-shear stress MPa; Q-maximum shear load N; A-shear surface area, mm
2; A, b are regression equation regression coefficient.
Test specimen described in above step (1) is not less than 1000mm, the wide 1000mm that is not less than for long, and height is not less than the rock-fill concrete test specimen of 1000mm; Described test specimen comprises rock-mounded concrete dam Coating combination position.
The loading of the vertical load described in above step (4) is using the time as control, and once, reading immediately after loading, can apply next stage load in every 3-10 minute loading.
The applying of the horizontal load described in above step (5) is using the time as control, and once, reading immediately after loading, read once again, can apply next stage load after 3-5 minute in every 3-10 minute loading.
The initial value of the vertical load of above-described different detection test specimen is different.
The detection method of above-described construction work rock-fill concrete Coating combination face shearing strength, is applied to the detection of the rock-fill concrete Coating combination face shearing strength of water conservancy and hydropower dam body, complicated structures or ground foundation engineering.
Relative to prior art, advantage of the present invention and good effect as follows:
1, the present invention excavates and makes test specimen on rock-fill concrete dam body, jack pair test specimen is adopted to carry out shearing strength test, because the power applied test specimen is pure shear, concrete destruction face is consistent with shearing resistance direction, reduce the influence factor in test process, improve measuring accuracy, and test process is simple.
2, the present invention is control with time at load applying, and process of the test is accurately effective, avoids the destruction to test specimen in test process, improves measuring accuracy further.
3, the device conveniently moving that the present invention is used, not by geographical restriction, can be widely used in the detection of the rock-mounded concrete dam Coating combination face shearing strength of the industries such as dam, railway, building.
Accompanying drawing explanation
Fig. 1 is schematic diagram of the present invention.
Accompanying drawing identifies:
1-test specimen, 2-lifting jack, 3-clock gauge.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Embodiment 1:
The detection method of a kind of construction work rock-fill concrete Coating combination face shearing strength, tested rock-mounded concrete dam or rock-fill concrete base make 5 test specimens, test specimen is long is 1000mm, wide is 1000mm, height is the rock-fill concrete test specimen of 1000mm, and described test specimen comprises rock-mounded concrete dam Coating combination position.The horizontal direction and vertical direction of each detection test specimen are all symmetrically installed with 4 clock gauges, detect horizontal distortion and the vertical deformation of test specimen respectively.Respectively lifting jack is installed detecting on the surface level of test specimen and vertical plane, for the load of the load and vertical direction that apply horizontal direction.Apply vertical load step by step, loading is using the time as control, and once, reading immediately after loading, can apply next stage load in loading in every 3 minutes.Observe the clock gauge on vertical plane, when the difference of double vertical deformation is no more than 1%mm, stops applying vertical load, read vertical load P.Apply horizontal load step by step, the applying of horizontal load is using the time as control, and once, reading immediately after loading, read once again, can apply next stage load after 3 minutes in loading in every 3 minutes.Clock gauge numerical value on reading horizontal face, when the horizontal distortion that added horizontal load causes exceed previous stage load cause more than 1.5 times of distortion time, off-loading applies, until cut off, reading horizontal load Q.
All the other test specimens repeat above-mentioned steps successively, until complete the detection of whole test specimen; The initial value of the vertical load of different detection test specimens is different.
The computing formula of the normal stress on vertical plane is σ=P/A: the computing formula of the shear stress on shear surface is: τ=Q/A, draws the computing formula of the Coating combination face shearing strength of rock-mounded concrete dam or base:
τ＝aσ+b
In formula: σ-normal stress MPa; P-vertical load N; τ-shear stress MPa; Q-maximum shear load N; A-shear surface area, mm
2; A, b are regression equation regression coefficient.
The detection method of above-described construction work rock-fill concrete Coating combination face shearing strength, is applied to the detection of the rock-fill concrete Coating combination face shearing strength of water conservancy and hydropower dam body, complicated structures or ground foundation engineering.
Embodiment 2:
The detection method of a kind of construction work rock-fill concrete Coating combination face shearing strength, tested rock-mounded concrete dam or rock-fill concrete base make 6 test specimens, test specimen is long is 1200mm, wide is 1200mm, height is the rock-fill concrete test specimen of 1200mm, and described test specimen comprises rock-mounded concrete dam Coating combination position.The horizontal direction and vertical direction of each detection test specimen are all symmetrically installed with 4 clock gauges, detect horizontal distortion and the vertical deformation of test specimen respectively.Respectively lifting jack is installed detecting on the surface level of test specimen and vertical plane, for the load of the load and vertical direction that apply horizontal direction.Apply vertical load step by step, loading is using the time as control, and once, reading immediately after loading, can apply next stage load in loading in every 5 minutes.Observe the clock gauge on vertical plane, when the difference of double vertical deformation is no more than 1%mm, stops applying vertical load, read vertical load P.Apply horizontal load step by step, the applying of horizontal load is using the time as control, and once, reading immediately after loading, read once again, can apply next stage load after 5 minutes in loading in every 5 minutes.Clock gauge numerical value on reading horizontal face, when the horizontal distortion that added horizontal load causes exceed previous stage load cause more than 1.5 times of distortion time, off-loading applies, until cut off, reading horizontal load Q.
All the other test specimens repeat above-mentioned steps successively, until complete the detection of whole test specimen; The initial value of the vertical load of different detection test specimens is different.
The computing formula of the normal stress on vertical plane is σ=P/A: the computing formula of the shear stress on shear surface is: τ=Q/A, draws the computing formula of the Coating combination face shearing strength of rock-mounded concrete dam or base:
τ＝aσ+b
In formula: σ-normal stress MPa; P-vertical load N; τ-shear stress MPa; Q-maximum shear load N; A-shear surface area, mm
2; A, b are regression equation regression coefficient.
Embodiment 3:
The detection method of a kind of construction work rock-fill concrete Coating combination face shearing strength, tested rock-mounded concrete dam or rock-fill concrete base make 8 test specimens, test specimen is long is 1300mm, wide is 1300mm, height is the rock-fill concrete test specimen of 1300mm, and described test specimen comprises rock-mounded concrete dam Coating combination position.The horizontal direction and vertical direction of each detection test specimen are all symmetrically installed with 4 clock gauges, detect horizontal distortion and the vertical deformation of test specimen respectively.Respectively lifting jack is installed detecting on the surface level of test specimen and vertical plane, for the load of the load and vertical direction that apply horizontal direction.Apply vertical load step by step, loading is using the time as control, and once, reading immediately after loading, can apply next stage load in loading in every 10 minutes.Observe the clock gauge on vertical plane, when the difference of double vertical deformation is no more than 1%mm, stops applying vertical load, read vertical load P.Apply horizontal load step by step, the applying of horizontal load is using the time as control, and once, reading immediately after loading, read once again, can apply next stage load after 5 minutes in loading in every 10 minutes.Clock gauge numerical value on reading horizontal face, when the horizontal distortion that added horizontal load causes exceed previous stage load cause more than 1.5 times of distortion time, off-loading applies, until cut off, reading horizontal load Q.
All the other test specimens repeat above-mentioned steps successively, until complete the detection of whole test specimen; The initial value of the vertical load of different detection test specimens is different.
The computing formula of the normal stress on vertical plane is σ=P/A: the computing formula of the shear stress on shear surface is: τ=Q/A, draws the computing formula of the Coating combination face shearing strength of rock-mounded concrete dam or base:
τ＝aσ+b
In formula: σ-normal stress MPa; P-vertical load N; τ-shear stress MPa; Q-maximum shear load N; A-shear surface area, mm
2; A, b are regression equation regression coefficient.
Claims (6)
1. the detection method of a construction work rock-fill concrete Coating combination face shearing strength, it is characterized in that: after the rock-mounded concrete dam of construction work or base make test specimen by excavation, test specimen applies vertical load and horizontal load respectively step by step, again according to the computing formula of the normal stress on shear surface and shear stress, determine linear regression coeffficient, calculate the shearing strength in the Coating combination face of this rock-mounded concrete dam or base, detecting step is as follows:
(1) test specimen makes: on tested rock-mounded concrete dam or rock-fill concrete base, make the test specimen being no less than 5;
(2) clock gauge is installed: in the horizontal direction and vertical direction of each detection test specimen, be all symmetrically installed with 4 clock gauges, detect horizontal distortion and the vertical deformation of test specimen respectively;
(3) lifting jack is installed: respectively lifting jack is installed detecting on the surface level of test specimen and vertical plane, for the load of the load and vertical direction that apply horizontal direction;
(4) apply vertical load: apply vertical load step by step, observe the clock gauge on vertical plane, when the difference of double vertical deformation is no more than 1%mm, stops applying vertical load, read vertical load P;
(5) horizontal load is applied: apply horizontal load step by step, clock gauge numerical value on reading horizontal face, when the horizontal distortion that added horizontal load causes exceed previous stage load cause more than 1.5 times of distortion time, off-loading applies, until cut off, reading horizontal load Q;
(6) all the other test specimens repeat above-mentioned steps (2) successively to (5), until complete the detection of whole test specimen;
(7) calculate: the computing formula of the normal stress on vertical plane is σ=P/A: the computing formula of the shear stress on shear surface is: τ=Q/A, draws the computing formula of the Coating combination face shearing strength of rock-mounded concrete dam or base:
τ＝aσ+b
In formula: σ-normal stress MPa; P-vertical load N; τ-shear stress MPa; Q-maximum shear load N; A-shear surface area, mm
2; A, b are regression equation regression coefficient.
2. the detection method of construction work rock-fill concrete Coating combination face according to claim 1 shearing strength, it is characterized in that: the test specimen described in step (1) is not less than 1000mm for long, widely be not less than 1000mm, height is not less than the rock-fill concrete test specimen of 1000mm; Described test specimen comprises rock-mounded concrete dam Coating combination position.
3. the detection method of rock-mounded concrete dam Coating combination face according to claim 1 shearing strength, it is characterized in that: the loading of the vertical load described in step (4) is using the time as control, once, reading immediately after loading, can apply next stage load in every 3-10 minute loading.
4. the detection method of construction work rock-fill concrete Coating combination face according to claim 1 shearing strength, it is characterized in that: the applying of the horizontal load described in step (5) is using the time as control, every 3-10 minute loading once, reading immediately after loading, read again once after 3-5 minute, next stage load can be applied.
5. the detection method of construction work rock-fill concrete Coating combination face according to claim 1 shearing strength, is characterized in that: the initial value of the vertical load of different detection test specimens is different.
6. the detection method of construction work rock-fill concrete Coating combination face according to claim 1 shearing strength, is applied to the detection of the rock-fill concrete Coating combination face shearing strength of water conservancy and hydropower dam body, complicated structures or ground foundation engineering.
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| CN104849152A (en) * | 2015-05-29 | 2015-08-19 | 长安大学 | Method for evaluating construction quality of stone-planting cement concrete bridge deck pavement structure |
| CN111896546A (en) * | 2020-07-02 | 2020-11-06 | 上海市建筑科学研究院有限公司 | New and old concrete joint surface quality detection method based on drilling and core drilling sampling |
| CN112945758A (en) * | 2021-04-12 | 2021-06-11 | 重庆市市政设计研究院有限公司 | Detection method for shear index of compacted filling |
| CN113447398A (en) * | 2021-06-18 | 2021-09-28 | 沈阳理工大学 | Testing device and testing method for steel fiber concrete fluidity representation |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849152A (en) * | 2015-05-29 | 2015-08-19 | 长安大学 | Method for evaluating construction quality of stone-planting cement concrete bridge deck pavement structure |
| CN104849152B (en) * | 2015-05-29 | 2017-12-19 | 长安大学 | A plant stone Bridge Surface Paving by Cement structure construction quality evaluating method |
| CN111896546A (en) * | 2020-07-02 | 2020-11-06 | 上海市建筑科学研究院有限公司 | New and old concrete joint surface quality detection method based on drilling and core drilling sampling |
| CN112945758A (en) * | 2021-04-12 | 2021-06-11 | 重庆市市政设计研究院有限公司 | Detection method for shear index of compacted filling |
| CN112945758B (en) * | 2021-04-12 | 2024-01-12 | 重庆市市政设计研究院有限公司 | Detection method for compaction filling shear index |
| CN113447398A (en) * | 2021-06-18 | 2021-09-28 | 沈阳理工大学 | Testing device and testing method for steel fiber concrete fluidity representation |
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