CN101281068B - Nondestructive detecting method of prestress anchoring load - Google Patents
Nondestructive detecting method of prestress anchoring load Download PDFInfo
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- CN101281068B CN101281068B CN2008100697015A CN200810069701A CN101281068B CN 101281068 B CN101281068 B CN 101281068B CN 2008100697015 A CN2008100697015 A CN 2008100697015A CN 200810069701 A CN200810069701 A CN 200810069701A CN 101281068 B CN101281068 B CN 101281068B
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- 238000004873 anchoring Methods 0.000 title claims description 22
- 238000000034 method Methods 0.000 title claims description 15
- 238000001228 spectrum Methods 0.000 claims abstract description 46
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 10
- 238000011088 calibration curve Methods 0.000 claims description 9
- 238000002604 ultrasonography Methods 0.000 claims description 9
- 238000013461 design Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 238000010276 construction Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000007774 longterm Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 239000003550 marker Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
A nondestructive detection method of prestress anchor load comprises increasing load in step, measuring and processing the ultrasonic signal at the measuring point of stretching table seat under the load, making the rating curve according to the value of each load and the comprehensive spectrum parameter ratio of the ultrasonic signal under the load, that is E<S>(K)-p curve, calculating the load loaded by the anchor line according to the comprehensive spectrum parameter ratio of the ultrasonic signal measured by the stretching table seat measuring point and E<S>(K)-p curve; the effective technical effects of the present invention are low cost, non-damage, quick and simple operation, wide application, comprehensive and long monitoring.
Description
Technical field
The present invention relates to a kind of detection technique of rock soil mass anchoring load, relate in particular to a kind of lossless detection method of prestress anchoring load.
Background technology
Be extensive use of prestress anchorage system at present in Geotechnical Engineering, as high slope reinforcing, landslide control engineering etc., particularly this class engineering is more and more many in development of the West Regions.In order to monitor the safety of anchoring engineering, must carry out long-term monitoring to the variation of prestress anchorage system load, its objective is that variation prediction by monitoring anchoring system load is by the stability of anchoring rock soil mass.At present, the prior art monitoring method mainly is that the method that employing is buried pressure transducer underground at the anchor cable anchor pier is monitored the variation of prestress anchorage system load.There is following defective in this method:
1, because costing an arm and a leg of sensor generally can only be buried sensor underground on indivedual anchor points in anchoring engineering, exists with the defective of point for face;
If 2 in observation process sensor go wrong and can't monitor, and can't recover;
3, because sensor uses for a long time in the open air, the burying technology during therefore to sensor performance, stability and construction is had relatively high expectations, and will directly have influence on construction costs.
Summary of the invention
For overcoming fanning out from point to area, can't recover and the more high defective of cost of existing prestress anchorage system loads change monitoring technology existence, the present invention proposes a kind of lossless detection method of prestress anchoring load.The comprehensive wave spectrum parameter of the ultrasonic signal that the lossless detection method of prestress anchoring load of the present invention detects according to the stretching bed seat measuring point is E when
S(k)-the P curve obtains the load that this anchor cable bears, have with low cost, not damaged, operation simple fast, can carry out characteristics such as comprehensive long term monitoring, not only can be used for high slope prestress anchoraging engineering, and can be used for bridge, industry is monitored with the prestress anchoring load in the engineerings such as covil construction, has important engineering practical value and application prospects.
The lossless detection method of prestress anchoring load of the present invention adopts classification to increase load and the ultrasonic signal of stretching bed seat measuring point under this load is measured and handled, according to the numerical value of every grade of load and under this load the comprehensive wave spectrum parameter of ultrasonic signal than formulating calibration curve, i.e. E
S(k)-and the P curve, the comprehensive wave spectrum parameter of the ultrasonic signal that detects according to the stretching bed seat measuring point is E when
S(k)-the P curve obtains the load that this anchor cable bears.
The classification of the lossless detection method of prestress anchoring load of the present invention increases the 10-80KN that is spaced apart of load, and the initial load that classification increases load is 0, and the termination load is that the 1-1.5 of anchor cable design load doubly determines.
The lossless detection method stretching bed seat measuring point of prestress anchoring load of the present invention is arranged on two relative sides of stretching bed seat of prestress anchorage cable, each side is arranged two above measuring points respectively, the measuring point of per two locus symmetries constitutes-right, each to the axis between measuring point near the pedestal center and not with stretching bed seat on the anchor cable hole intersect.
The lossless detection method of prestress anchoring load of the present invention calculates the comprehensive wave spectrum parameter ratio of ultrasonic signal under original state and the load at different levels according to following formula:
In the formula:
E
S(k) be the comprehensive wave spectrum parameter ratio of ultrasonic signal under the k level load;
J is≤-2 negative integer; J is a positive integer;
K is a positive integer.
The lossless detection method of prestress anchoring load of the present invention according to the numerical value of every grade of load and under this load the comprehensive wave spectrum parameter of ultrasonic signal than formulating calibration curve, i.e. E
S(k)-and the P curve, the step of formulating calibration curve comprises:
1) detect each the ultrasonic signal do not add the load state under to the measuring point correspondence, and with this as the initial ultrasound ripple signal under the zero loading status;
2) classification increases load and the ultrasonic signal of stretching bed seat measuring point under this load is measured;
3), calculate the comprehensive wave spectrum parameter ratio of the ultrasonic signal of pairing this measuring point under the loads at different levels according to the method that adopts above-mentioned formula;
4) with the load be horizontal ordinate, the comprehensive wave spectrum parameter of ultrasonic signal obtains calibration curve with loads at different levels and the comprehensive wave spectrum parameter of pairing ultrasonic signal than inserting successively, i.e. E than being ordinate
S(k)-the P curve.
The lossless detection method of prestress anchoring load of the present invention is according to the comprehensive wave spectrum parameter of the ultrasonic signal of stretching bed seat measuring point monitoring E when
S(k)-the P opisometer calculates the load that this anchor cable bears, comprising:
1) random time after anchor cable locking detects the ultrasonic signal of each stretching bed seat measuring point;
2) calculate the comprehensive wave spectrum parameter ratio of this stretching bed seat measuring point ultrasonic signal according to following formula,
In the formula:
E
S(t) each comprehensive wave spectrum parameter ratio that the ultrasonic signal between the measuring point is obtained that records in the t time for basis;
J is≤-2 negative integer; J is a positive integer;
T is a constant;
3) the comprehensive wave spectrum parameter according to this stretching bed seat measuring point ultrasonic signal compares E
SThe E of value (t) and this stretching bed seat measuring point
S(k)-and the P curve, obtain this E
S(t) the pairing load P of value.
Useful technique effect of the present invention is: with low cost, to, wide application fast simple along soil body not damaged, operation, can carry out comprehensive long term monitoring.
Description of drawings:
Accompanying drawing 1, the measuring point synoptic diagram;
Accompanying drawing 2, certain engineering measuring point actual measurement E
S(k)-the P curve map;
Accompanying drawing 3, the contrast of certain engineering measuring point load measured result;
Among the figure: measuring point 1, anchor cable hole 2, stretching bed seat 3.
Embodiment
Referring to accompanying drawing 1, before testing, arrange respectively measuring point 1, and on each measuring point 1, carry out permanent marker in concrete stretching bed seat 3 both sides; Concrete measuring point 1 logarithm can be selected according to actual requirement of engineering; The measuring point 1 of per two locus symmetries constitutes a pair of, each to the axis of 1 of measuring point should near the pedestal center and not with stretching bed seat 3 on anchor cable hole 2 intersect.
Before carrying out anchorage cable stretching, gather earlier the elastic wave propagation signal between each measuring point 1, i.e. ultrasonic signal, this detection is carried out not adding the load state, and with this as the initial ultrasound ripple signal under the zero loading status;
Classification increases load and the ultrasonic signal of the measuring point on the stretching bed seat 3 under this load 1 is measured, classification increase the interval of load can be in the 10-80KN scope reasonable selection, the initial load that classification increases load is 0, and the termination load is that the 1-1.5 of anchor cable design load doubly determines.
Ultrasonic signal under ultrasonic signal under the original state and the loading status at different levels is handled, and the existing method in concrete place is as follows:
Calculate the comprehensive wave spectrum parameter ratio of ultrasonic signal under original state and the load at different levels according to following formula:
In the formula:
E
S(k) be the comprehensive wave spectrum parameter ratio of ultrasonic signal under the k level load;
For ultrasonic signal under the k level load in the stage loading stretching process the 2nd
jThe frequency domain peak swing of the Wavelet Component under the yardstick;
J is≤-2 negative integer; J is a positive integer;
K is a positive integer.
According to the numerical value of every grade of load and under this load the comprehensive wave spectrum parameter of ultrasonic signal than formulating calibration curve, with the load is horizontal ordinate, the comprehensive wave spectrum parameter of ultrasonic signal is than being ordinate, loads at different levels and the comprehensive wave spectrum parameter of pairing ultrasonic signal are obtained calibration curve than inserting successively, i.e. E
S(k)-and the P curve, referring to accompanying drawing 2, the E for drawing out shown in the figure according to certain engineering measuring point actual measurement
S(k)-the P curve map.
In later stage monitoring, the comprehensive wave spectrum parameter of the ultrasonic signal that monitors according to 1 random time of the measuring point on the stretching bed seat 3 is E when
S(k)-and the P opisometer calculates the load that this anchor cable bears, and its concrete steps are as follows:
1) random time after anchor cable locking detects the ultrasonic signal of the measuring point 1 on each stretching bed seat 3;
2) calculate the comprehensive wave spectrum parameter ratio of measuring point 1 ultrasonic signal on this stretching bed seat 3 according to following formula,
In the formula:
E
S(t) each comprehensive wave spectrum parameter ratio that the ultrasonic signal between the measuring point 1 is obtained that records in the t time for basis;
J is≤-2 negative integer; J is a positive integer;
T is a constant;
3) the comprehensive wave spectrum parameter according to measuring point 1 ultrasonic signal on this stretching bed seat 3 compares E
SThe E of the value (t) and the measuring point 1 of this stretching bed seat 3 that pre-establishes
S(k)-and the P curve, interpolation is obtained this E
S(t) the pairing load P of value.
Referring to accompanying drawing 3, the comparison diagram of certain engineering measuring point load measured result.
Claims (5)
1. the lossless detection method of a prestress anchoring load, it is characterized in that: the employing classification increases load and the ultrasonic signal of the measuring point (1) on the stretching bed seat (3) under this load is measured and handled, according to the numerical value of every grade of load and under this load the comprehensive wave spectrum parameter of ultrasonic signal than formulating calibration curve, i.e. E
S(k)-and the P curve, the comprehensive wave spectrum parameter of the ultrasonic signal that detects according to stretching bed seat (3) measuring point (1) is E when
S(k)-the P curve obtains the load that this anchor cable bears;
Calculate the comprehensive wave spectrum parameter ratio of ultrasonic signal under original state and the load at different levels according to following formula:
In the formula:
E
S(k) be the comprehensive wave spectrum parameter ratio of ultrasonic signal under the k level load;
J is≤-2 negative integer; J is a positive integer;
K is a positive integer.
2. according to the lossless detection method of the described prestress anchoring load of claim 1, it is characterized in that: classification increases the 10-80KN that is spaced apart of load, and the initial load that classification increases load is 0, and the 1-1.5 that the termination load is pressed the anchor cable design load doubly determines.
3. according to the lossless detection method of the described prestress anchoring load of claim 1, it is characterized in that: stretching bed seat (3) measuring point (1) is arranged on two relative sides of stretching bed seat (3) of prestress anchorage cable, each side is arranged two above measuring points (1) respectively, it is a pair of that the measuring point of per two locus symmetries (1) constitutes, each to the axis between measuring point (1) near the pedestal center and not with stretching bed seat (3) on anchor cable hole (2) intersect.
4. according to the lossless detection method of the described prestress anchoring load of claim 1, it is characterized in that: according to the numerical value of every grade of load and under this load the comprehensive wave spectrum parameter of ultrasonic signal than formulating calibration curve, i.e. E
S(k)-and the P curve, comprising:
1) detect each ultrasonic signal corresponding do not add the load state under to measuring point (1), and with this as the initial ultrasound ripple signal under the zero loading status;
2) classification increases load and the ultrasonic signal of stretching bed seat (3) measuring point (1) under this load is measured;
3) method of the comprehensive wave spectrum parameter ratio of calculating according to claim 1 is calculated the comprehensive wave spectrum parameter ratio of the ultrasonic signal of pairing this measuring point (1) under the loads at different levels;
4) with the load be horizontal ordinate, the comprehensive wave spectrum parameter of ultrasonic signal obtains calibration curve with loads at different levels and the comprehensive wave spectrum parameter of pairing ultrasonic signal than inserting successively, i.e. E than being ordinate
S(k)-the P curve.
5. according to the lossless detection method of the described prestress anchoring load of claim 1, it is characterized in that: according to the comprehensive wave spectrum parameter of the ultrasonic signal of stretching bed seat (3) measuring point (1) monitoring E when
S(k)-the P opisometer calculates the load that this anchor cable bears, comprising:
1) random time after anchor cable locking detects the ultrasonic signal of each stretching bed seat (3) measuring point (1);
2) calculate the comprehensive wave spectrum parameter ratio of this stretching bed seat (3) measuring point (1) ultrasonic signal according to following formula,
In the formula:
E
S(t) each comprehensive wave spectrum parameter ratio that the ultrasonic signal between the measuring point (1) is obtained that records in the t time for basis;
J is≤-2 negative integer; J is a positive integer;
T is a constant;
3) the comprehensive wave spectrum parameter according to this stretching bed seat (3) measuring point (1) ultrasonic signal compares E
SThe E of value (t) and this stretching bed seat (3) measuring point (1)
S(k)-and the P curve, obtain this E
S(t) the pairing load P of value.
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101593227B (en) * | 2009-06-30 | 2011-04-20 | 重庆交通大学 | Slope back analysis method based on anchoring load monitoring data |
| CN101672751B (en) * | 2009-09-28 | 2011-08-17 | 四川升拓检测技术有限责任公司 | Nondestructive test method for testing tension of prestress anchorage system |
| CN102865952B (en) * | 2012-09-13 | 2014-11-12 | 许锡宾 | Nondestructive testing method for working stress of concrete |
| CN106645397B (en) * | 2016-09-28 | 2019-05-21 | 中交第二公路勘察设计研究院有限公司 | A kind of compaction degree test method of shield machine air pushing tunnel duct piece |
| CN106979743B (en) * | 2017-04-19 | 2018-08-10 | 中国地质大学（武汉） | A kind of landslide depth big displacement adaptive monitoring system and method |
| CN110907076B (en) * | 2019-10-21 | 2020-11-17 | 武汉大学 | Method for detecting uniform hoop restraining force of circular steel tube concrete column in real time by ultrasonic waves |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5919005A (en) * | 1997-07-02 | 1999-07-06 | Integrated Stabilzation Technologies Inc. | Ground anchor device for penetrating an underground rock formation |
| CN2863895Y (en) * | 2006-01-13 | 2007-01-31 | 重庆交通学院 | Prestress anchorage load monitoring device |
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2008
- 2008-05-20 CN CN2008100697015A patent/CN101281068B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5919005A (en) * | 1997-07-02 | 1999-07-06 | Integrated Stabilzation Technologies Inc. | Ground anchor device for penetrating an underground rock formation |
| CN2863895Y (en) * | 2006-01-13 | 2007-01-31 | 重庆交通学院 | Prestress anchorage load monitoring device |
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| Title |
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| 孙永联等.声波波谱技术在采矿工程中的应用研究.岩石力学工程学报12 2.1993,12(2),115-125. * |
| 赵明阶等.小波变换理论及其在岩石声学特性研究中的应用.岩土工程学报20 6.1998,20(6),47-51. * |
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