CN100447337C - Application technology of falling weight deflectometer and ground penetrating radar in pavement construction - Google Patents
Application technology of falling weight deflectometer and ground penetrating radar in pavement construction Download PDFInfo
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- CN100447337C CN100447337C CNB2005100176762A CN200510017676A CN100447337C CN 100447337 C CN100447337 C CN 100447337C CN B2005100176762 A CNB2005100176762 A CN B2005100176762A CN 200510017676 A CN200510017676 A CN 200510017676A CN 100447337 C CN100447337 C CN 100447337C
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Abstract
The present invention discloses an application technique of falling weight deflectometers and ground penetrating radars in the process of road construction. Through the application technique of falling weight deflectometers, the present invention can conduct layer detecting evaluation to road quality and evaluation to punching effects of roadbeds; through the application technique of ground penetrating radars, the present invention can conduct continuous detecting evaluation to the thickness, the punching degree and the water content of road surface structure layers. Through the application technique of falling weight deflectometers and ground penetrating radars, thickness results detected by a ground penetrating radar are input into an inverse computation software for road surface structural mechanics characteristics, and the software is based on data detected by a falling weight deflectometer. Thus, the inverse computation precision of the road surface structural mechanics characteristics is improved. The invention can rapidly conduct real-time detecting evaluation to roads in the process of construction without breakage along multi-direction, discover hidden troubles of construction quality in time, and control the construction quality. Therefore, the present invention has great application value and obvious social and economic benefit for avoiding early breakage, prolonging the service life of roads, reducing maintenance funds, etc. and conforms to current urgent requirements of road construction and management in China.
Description
The field
The invention belongs to subgrade and pavement nondestructive testing evaluation, relate in particular to the application in the road construction process of Falling Weight Deflectometer and ground penetrating radar.
Background
In recent years, the highway construction of China is in flourish period, and particularly high-grade highway construction is in the ascendant.How in time to find workmanship hidden danger, control construction quality, thus avoid the road surface to destroy, improve road application life too early, reduce the maintenance fund and become and be badly in need of the key issue that solves in highway in China construction and the management.
Because China's expressway construction starts late, subgrade and pavement detects estimates slower development, and the advanced detection means and the shortage of evaluation make the phenomenon ubiquity that the road surface is destroyed too early, and many road networks fail to give full play to its service ability.Tracing it to its cause, is that checkout equipment is relatively backward on the one hand, does not adopt the detection evaluation method of science that construction quality is carried out strictness control in the road construction process.Detect the also main Beckman beam that adopts the invention fifties such as the existing pavement deflection of China, road structure layer thickness, water content and degree of compaction detect the main disruptive methods such as boring and coring or on-the-spot excavation that rely on.The artificial means that these are traditional, not only efficient is low, representative poor, and highway is had certain destructiveness.On the other hand, though the import of existing at present many units some external advanced checkout equipments owing to lack supportingly accordingly, cause these equipment not give full play to due effect as yet.The development of this situation and current highway construction is far from suitable.
Falling Weight Deflectometer is since the seventies comes out, because it can be fast, can't harm, collect exactly the information of pavement deflection basin, the bulk strength that reflects the road surface, for the evaluation of road surface supporting capacity and the prediction in application life provide necessary base, particularly the impulsive load that applies of Falling Weight Deflectometer has been simulated actual traffic load preferably, therefore Falling Weight Deflectometer is very fast is received by engineering circle, and becomes the research focus.The strategic highway research program of the U.S. (SHRP) has been carried out system to Falling Weight Deflectometer and careful research has been pushed the application of Falling Weight Deflectometer to climax.
Ground penetrating radar is as the important achievement in the time domain transient electromagnetic field theoretical developments process, combine the achievement in research of multi-door subjects such as Transient Electromagnetic field theory, time domain measurement, nanosecond pulse source, ultra-wideband antenna and signal processing, have advantages such as not damaged, high efficiency, low cost and high-resolution imaging, become one of important tool of underground shallow layer exploration.It utilizes the penetration capacity of electromagnetic wave to the face of land, from the face of land to underground emission high-frequency impulse electromagnetic wave, reflection and refraction take place in electromagnetic wave on the interface that characteristics of underground media changes, by receiving reflection echo signal, according to parameters such as its time delay, shape and spectral characteristics, separate and translate target depth, dielectric structure and character, continuously, fast, do not have damaged the detection and demonstrate wide application prospect and huge social and economic benefit aspect the Pavement Performance index, progressively become the focus that people pay close attention to.At present, ground penetrating radar detects has become the important component part of subgrade and pavement nondestructive testing, and the developing direction of having represented road structure layer thickness, degree of compaction, water content and bitumen content etc. to detect.
Use for Falling Weight Deflectometer and ground penetrating radar, all carried out years of researches work both at home and abroad, and obtained achievement than horn of plenty.But generally speaking, the research of utility theory and the exploitation of software kit lag behind the development of high-tech checkout equipment all the time, and wherein subgrade and pavement material behavior inversion problem hampers the development of nondestructive testings such as Falling Weight Deflectometer, ground penetrating radar always.At present, the achievement in research that Falling Weight Deflectometer and ground penetrating radar are used only is confined to the evaluation and the system management of science that the functional performance of building up highway is carried out, i.e. the maintenance evaluation aspect of road, and Falling Weight Deflectometer is used mutually with ground penetrating radar and disconnected.How Falling Weight Deflectometer and ground penetrating radar are applied to the control of road construction procedure quality, and Falling Weight Deflectometer are used to combine with ground penetrating radar relevant achievement is not also arranged.
Summary of the invention
The present invention is based on the achievement in research of subgrade and pavement characteristic of material mechanics and dielectric property inversion theory, research Falling Weight Deflectometer and the application of ground penetrating radar in the road construction process, thus in time find workmanship hidden danger, control construction quality.
Solution of the present invention is:
The application in the road construction process of a kind of Falling Weight Deflectometer and ground penetrating radar, described application comprise following three aspects:
(1) application of Falling Weight Deflectometer in the road construction process comprises that the road quality layering detects evaluation and roadbed punching press actual effect is really estimated;
A, subgrade and pavement layering detect to be estimated
Concrete implementation step is: when blocking the way route roadbed, subbase, basic unit successively construct to surface layer, at first adopt Falling Weight Deflectometer to begin successively each deck of road to be carried out deflection test from roadbed, utilize mechanical characteristic back analysis software that the flexure data are analyzed then, mechanical characteristics such as rigidity to the road structure layer are made evaluation, in time find hidden danger of quality, control construction quality;
B, roadbed shock compaction effect assessment
Concrete implementation step is: at first adopt Falling Weight Deflectometer to detect the flexure of roadbed under the different compacting countings, utilize the modulus at mechanical characteristic back analysis software inverse different roadbed degree of depth place then, thereby roadbed shock compaction effect is estimated;
(2) application of ground penetrating radar in the road construction process comprises that the road structure layer thickness detects evaluation and road surface structare layer degree of compaction, water content detect evaluation;
A, road structure layer thickness continuous detecting are estimated
Concrete implementation step is: in the road construction process, utilize ground penetrating radar that each deck is carried out follow-on test, utilize dielectric property and thickness analysis that Coherent Noise in GPR Record is analyzed then, obtain the thickness of each deck, and the design load of itself and each Laminate construction thickness compared, in time find hidden danger of quality;
B, road surface structare layer degree of compaction, water content continuous detecting are estimated
Concrete implementation step is: in the road construction process, adopt ground penetrating radar that each deck is carried out follow-on test, utilize dielectric property and degree of compaction, analysis of moisture content that Coherent Noise in GPR Record is analyzed then, obtain the degree of compaction and the water content of each deck, find out the highway section of compacting deficiency, in time find hidden danger of quality, control construction quality;
(3) Falling Weight Deflectometer and ground penetrating radar are used is integrated in application in the road construction process, the continuous detecting analysis result input of ground penetrating radar road pavement Laminate construction thickness is detected in the structural mechanics characteristic of pavement inverse software of data, to improve the inverse precision of existing software road pavement structural mechanics characteristic based on Falling Weight Deflectometer.
The present invention's application in the road construction process by Falling Weight Deflectometer and ground penetrating radar, can be fast, do not have damaged, multi-faceted to detecting in real time and estimate building highway, in time find workmanship hidden danger, control construction quality, this has major application and is worth and the significant social economic benefit for being avoided the road surface to destroy, improve road network service quality and aspects such as application life, minimizing maintenance fund too early.The present invention not only has great impetus for the development and the application of highway nondestructive testings such as Falling Weight Deflectometer and ground penetrating radar, and meets pressing for of China's expressway construction and management.
The specific embodiment
Embodiment: the application in the road construction process of Falling Weight Deflectometer of the present invention and ground penetrating radar comprises following content:
(1) application of Falling Weight Deflectometer in the road construction process comprises that the road quality layering detects evaluation and roadbed punching press actual effect is really estimated;
A, subgrade and pavement layering detect to be estimated
Described subgrade and pavement layering detects and estimates is to use the present invention in time to find road quality hidden danger by each deck is successively detected with assay in the road construction process, thereby Control Engineering quality effectively prevents that fundamentally the road surface from destroying too early.
Concrete implementation step is: when blocking the way route roadbed, subbase, basic unit successively construct to surface layer, adopt Falling Weight Deflectometer to begin successively each deck to be carried out deflection test from roadbed, utilize mechanical characteristic back analysis software that the flexure data are analyzed then, mechanical characteristics such as rigidity to the road structure layer are made evaluation, in time find hidden danger of quality, control construction quality.
B, roadbed shock compaction effect assessment
In order to accelerate the construction of the highway progress, the natural settling time that reduces roadbed need solve the deep compaction problem of roadbed, and shock compaction is based on the compacting that this problem grows up, yet its consolidation effect but is difficult to traditional evaluation that detects.Utilize the present invention, detect the flexure of roadbed under the different compacting countings, utilize the modulus at mechanical characteristic back analysis software inverse different roadbed degree of depth place then, thereby roadbed shock compaction effect is estimated by adopting Falling Weight Deflectometer.
Provide the express highway roadbed shock compaction of Guangzhou Hui He below and detect evaluation example:
Respectively before the soil matrix shock compaction, compacting 5 times, 10 times, 15 times, 20 times carries out flexure with Falling Weight Deflectometer and detects, detection statistics the results are shown in Table 1.
Falling Weight Deflectometer test flexure average under the different punching press passes of table 1
| D1 | D2 | D3 | D4 | D5 | D6 | D7 | D8 | D9 | |
| 0 time | 2406.1 | 1533.0 | 859.9 | 445.2 | 256.1 | 133.5 | 92.2 | 65.6 | 49.5 |
| 5 times | 2144.4 | 1269.8 | 725.8 | 397.1 | 234.4 | 122.5 | 78.7 | 55.2 | 43.1 |
| 10 times | 2053.0 | 1184.0 | 656.8 | 366.4 | 229.7 | 122.9 | 81.0 | 58.6 | 43.4 |
| 15 times | 1987.4 | 1075.1 | 618.2 | 353.9 | 226.7 | 122.7 | 79.1 | 55.5 | 44.9 |
| 20 times | 1830.8 | 1034.6 | 595.6 | 352.1 | 228.4 | 121.7 | 78.9 | 59.3 | 43.1 |
Soil matrix is divided into 4 layers, uses each layer of software inverse modulus then, inverse the results are shown in Table 2.
Each layer of soil matrix modulus average under the different punching press passes of table 2
| 0 time | 5 times | 10 times | 15 times | 20 times | |
| First floor 30cm | 22.4 | 37.9 | 42.3 | 52.7 | 56.9 |
| Second layer 60cm | 44.9 | 55.2 | 66.0 | 69.7 | 67.6 |
| The 3rd layer of 90cm | 90.0 | 94.3 | 85.5 | 97.5 | 95.9 |
| The 4th layer unlimited dark | 140.9 | 167.6 | 168.8 | 175.9 | 172.1 |
By result in the analytical table, can tentatively obtain as drawing a conclusion:
This shock compaction has good deep consolidation effect.The soil matrix degree of depth is effect highly significant in 1 meter apart from the face of land.To this example, punching press has reached effect preferably 15 times, continues the punching press DeGrain.
(2) application of ground penetrating radar in the road construction process comprises that the road structure layer thickness detects evaluation and road surface structare layer degree of compaction, water content detect evaluation:
A, road structure layer thickness continuous detecting are estimated
Concrete implementation step is: in the road construction process, utilize ground penetrating radar that each deck is carried out follow-on test, utilize dielectric property and thickness analysis that Coherent Noise in GPR Record is analyzed then, obtain the thickness of each deck, and the design load of itself and each Laminate construction thickness compared, in time find hidden danger of quality.
B, road surface structare layer degree of compaction, water content continuous detecting are estimated
Concrete implementation step is: in the road construction process, adopt ground penetrating radar that each deck is carried out follow-on test, utilize dielectric property and degree of compaction, analysis of moisture content that Coherent Noise in GPR Record is analyzed then, obtain the degree of compaction and the water content of each deck, find out the highway section of compacting deficiency, in time find hidden danger of quality, control construction quality.
(3) Falling Weight Deflectometer and ground penetrating radar are used is integrated in application in the road construction process, the continuous detecting analysis result input of ground penetrating radar road pavement Laminate construction thickness is detected in the structural mechanics characteristic of pavement inverse software of data, to improve the inverse precision of existing software road pavement structural mechanics characteristic based on Falling Weight Deflectometer.
Claims (1)
1, a kind of Falling Weight Deflectometer and the ground penetrating radar application in the road construction process is characterized in that: the application in the road construction process of described Falling Weight Deflectometer and ground penetrating radar comprises aspect following three:
(1) application of Falling Weight Deflectometer in the road construction process comprises that the road quality layering detects evaluation and roadbed punching press actual effect is really estimated;
A, subgrade and pavement layering detect to be estimated
Concrete implementation step is: when blocking the way route roadbed, subbase, basic unit successively construct to surface layer, at first adopt Falling Weight Deflectometer to begin successively each deck of road to be carried out deflection test from roadbed, utilize mechanical characteristic back analysis software that the flexure data are analyzed then, rigidity mechanical characteristic to the road structure layer is made evaluation, in time find hidden danger of quality, control construction quality;
B, roadbed shock compaction effect assessment
Concrete implementation step is: at first adopt Falling Weight Deflectometer to detect the flexure of roadbed under the different compacting countings, utilize the modulus at mechanical characteristic back analysis software inverse different roadbed degree of depth place then, thereby roadbed shock compaction effect is estimated;
(2) application of ground penetrating radar in the road construction process comprises that the road structure layer thickness detects evaluation and road surface structare layer degree of compaction, water content detect evaluation:
A, road structure layer thickness continuous detecting are estimated
Concrete implementation step is: in the road construction process, utilize ground penetrating radar that each deck is carried out follow-on test, utilize dielectric property and thickness analysis that Coherent Noise in GPR Record is analyzed then, obtain the thickness of each deck, and the design load of itself and each Laminate construction thickness compared, in time find hidden danger of quality;
B, road surface structare layer degree of compaction, water content continuous detecting are estimated
Concrete implementation step is: in the road construction process, adopt ground penetrating radar that each deck is carried out follow-on test, utilize dielectric property and degree of compaction, analysis of moisture content that Coherent Noise in GPR Record is analyzed then, obtain the degree of compaction and the water content of each deck, find out the highway section of compacting deficiency, in time find hidden danger of quality, control construction quality;
(3) Falling Weight Deflectometer and ground penetrating radar are used is integrated in application in the road construction process, the continuous detecting analysis result input of ground penetrating radar road pavement Laminate construction thickness is detected in the structural mechanics characteristic of pavement inverse software of data, to improve the inverse precision of existing software road pavement structural mechanics characteristic based on Falling Weight Deflectometer.
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| CN101256181B (en) * | 2008-03-20 | 2011-11-23 | 山东省交通科学研究所 | Method for detecting pavement disease breakage |
| CN101684631B (en) * | 2008-09-28 | 2012-07-04 | 铁道部第三勘测设计院岩土工程总公司 | Safety state fast non-destructive detection method of operation roadbed |
| DE102010052713A1 (en) * | 2010-11-26 | 2012-05-31 | Bomag Gmbh | A traveling soil compacting device and method for detecting a layer E modulus of a topmost layer of said bottom layer structure |
| CN102345269B (en) * | 2011-07-14 | 2013-04-03 | 广州大学 | Rubber asphalt compacting technology based on pavement quality indicator |
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| CN108572248A (en) * | 2018-04-16 | 2018-09-25 | 长沙理工大学 | A method of based on non-destructive testing technology evaluation path technology status |
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Address after: 450002 No. 97, Wenhua Road, Henan, Zhengzhou Patentee after: Zhengzhou University Patentee after: Zhengzhou Anyuan Engineering Technology Co., Ltd. Address before: 450002 No. 97, Wenhua Road, Henan, Zhengzhou Patentee before: Zhengzhou University Patentee before: Zhengzhou Dynatest Technology Ltd. |