CN111424633A - Method for rapidly detecting roadbed diseases - Google Patents
Method for rapidly detecting roadbed diseases Download PDFInfo
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- CN111424633A CN111424633A CN202010248962.4A CN202010248962A CN111424633A CN 111424633 A CN111424633 A CN 111424633A CN 202010248962 A CN202010248962 A CN 202010248962A CN 111424633 A CN111424633 A CN 111424633A
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- road
- roadbed
- grouting
- radar
- rapidly detecting
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D1/00—Investigation of foundation soil in situ
- E02D1/08—Investigation of foundation soil in situ after finishing the foundation structure
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
- E01C23/01—Devices or auxiliary means for setting-out or checking the configuration of new surfacing, e.g. templates, screed or reference line supports; Applications of apparatus for measuring, indicating, or recording the surface configuration of existing surfacing, e.g. profilographs
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/003—Injection of material
Abstract
The invention discloses a method for quickly detecting roadbed diseases. The method arranges a plurality of displacement monitoring points in the region with most obvious road settlement, and adopts geological radars loaded with different main frequency shielding antennas to detect one by one on a measuring line in the direction parallel to the road; comparing and analyzing the detection results of the same measuring line and different main frequency radars, circling an electromagnetic abnormal area which has strong amplitude and a certain extension scale or approximate hyperbolic shape in the horizontal and longitudinal directions of a same phase axis, and marking the electromagnetic abnormality on a measuring line plane layout diagram; and evaluating the void and cavity development conditions of the roadbed and the underlying soil body according to the radar analysis result, determining the range and grouting depth of geological grouting according to the void and cavity development conditions, and continuously monitoring the settlement condition of the road observation point after grouting is finished. The method can simultaneously reflect the electromagnetic information in the depth range of more than ten centimeters to several meters below the road surface, has high electromagnetic anomaly interpretation precision, can provide guidance for subsequent road grouting construction, and can be used for evaluating the grouting effect.
Description
Technical Field
The invention relates to the field of highway subgrade disease detection, in particular to a high-frequency and low-frequency combined antenna geological radar method for highway subgrade disease detection.
Background
Pavement settlement is easy to occur when open caisson and shield construction is carried out near a road, and if settlement displacement monitoring is not carried out in time, blind construction is carried out, pavement collapse is easy to cause in the driving process of a vehicle, and life and property loss is caused. Therefore, the potential void areas of the road subgrade and the underlying soil body are found out, and the measures of reinforcing the rock-soil body by adopting consolidation grouting in due time according to the void situation are very necessary for engineering safety construction. The detection of the void of the underground rock-soil body on the road surface usually adopts a physical detection method, a high-density electrical method and a seismic reflection wave method as common physical detection means in the field of engineering investigation, and both require that an electrode or a detector is arranged in the soil body, so the detection of the underground rock-soil body on the road surface is not convenient. The geological radar method is another common pavement electromagnetic detection technology, underground rock and soil body difference is detected by adopting a dragging antenna or point-by-point measurement mode, the detection depth and resolution are related to the main frequency of the adopted antenna, the low-frequency antenna has larger detection depth but lower resolution, and the high-frequency antenna is opposite, so the contradiction between the detection depth and the resolution cannot be solved by adopting a single-antenna radar detection mode.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for quickly detecting roadbed diseases of roads in open caisson construction process, wherein radar detection results with different main frequencies are compared and analyzed, the electromagnetic anomaly interpretation precision can be improved, the detection results provide guidance for subsequent road grouting construction, and meanwhile, real-time monitoring data are combined for grouting effect evaluation.
The purpose of the invention is realized by the following technical scheme:
a method for quickly detecting roadbed diseases comprises the following steps:
s1, arranging a plurality of displacement monitoring points in an area with the most obvious road settlement, arranging a plurality of geological radar measuring lines in the road settlement area and the peripheral area thereof in the direction parallel to the road, and marking the edges of the road one by red paint at regular intervals from the end points of the measuring lines, wherein the distance is generally 10 m;
s2, detecting geological radars loaded with two main-frequency shielding antennas one by one on a designed measuring line, and marking a mark on an acquired radar profile map when the antennas move to a red paint mark to obtain two main-frequency geological radar profile results; the two dominant frequencies are typically 100MHz and 500 MHz.
S3, comparing and analyzing the data processing results of the two main frequency geological radars, circling an electromagnetic abnormal area which has strong amplitude and a certain extension scale or approximate hyperbolic shape in the horizontal and longitudinal directions of a same phase axis, counting the electromagnetic abnormality of the geological radar according to the subentry content, and marking the electromagnetic abnormality on a survey line plane layout chart; the subentry content is the content such as a measuring line number, an abnormal mileage interval, an abnormal depth range, abnormal description and the like.
S4, evaluating the void and cavity development conditions of the roadbed and the underlying soil body according to the radar analysis result, determining the range and depth of geological grouting according to the void and cavity development conditions, and continuously monitoring the settlement condition of the road observation point after grouting;
s5, if the grouting is finished in the step S4, the monitoring result shows that the settlement is stable, the grouting effect is good, and if the settlement is still unstable, the steps S2 to S4 are repeated until the monitoring result shows that the settlement is stable.
Further, the geological radar in step S1 is MA L a geological radar.
Further, the step S3 where the homophase axes have a certain extension in the transverse and longitudinal directions means that the difference between the transverse and inward distances of the homophase axes is greater than 1m and the longitudinal time difference is greater than 20 ns.
Further, the evaluation of the void and cavity development conditions of the roadbed and the underlying soil body in step S4 means that the radar abnormal features corresponding to the void are reflected in a reflected wave with a strong amplitude, the event is in a strip shape, the radar abnormal features corresponding to the cavity are reflected in a reflected wave with a strong amplitude, and the event is in a hyperbolic shape.
Further, the sedimentation stabilization in step S5 means that the daily observed sedimentation displacement is less than 3 mm.
The invention has the beneficial effects that:
the invention adopts two different dominant frequency radar antennas for combined detection, can simultaneously reflect electromagnetic information in a depth range of more than ten centimeters to several meters below a road surface, simultaneously considers the detection depth and the resolution, can improve the electromagnetic anomaly interpretation precision by comparing and analyzing radar detection results of different dominant frequencies, provides guidance for subsequent road grouting construction by the detection results, and can be used for grouting effect evaluation by combining real-time monitoring data.
Drawings
FIG. 1 is a geological radar survey line layout and a master electromagnetic anomaly zone layout of an embodiment of the present invention;
FIG. 2 is a geological mine detection profile of a 100MHz antenna in accordance with an embodiment of the present invention.
Detailed Description
The invention will be further explained with reference to the drawings.
The invention relates to a method for quickly detecting roadbed diseases, which comprises the following steps:
s1, arranging a plurality of displacement monitoring points in the region with the most obvious road settlement, arranging a plurality of geological radar measuring lines in the road settlement region and the peripheral region thereof in the direction parallel to the road, and marking the edges of the road one by one with red paint every 10m from the end points of the measuring lines as shown in figure 1.
S2, connecting a 100MHz shielding antenna, an MA L A radar host and a notebook, opening radar acquisition software, and setting radar acquisition parameters, wherein a distance measurement mode is adopted in the embodiment, the sampling frequency is 1200MHz, the time window is 200ns, the track interval is 0.05m, one person drags the antenna to slowly move during detection, a mark is marked on an acquired radar profile when the antenna moves to a red paint mark, after the detection of 9 measuring lines is finished, the 500MHz shielding antenna is connected to the radar host, except that the time window is set to be 30ns, the rest parameters are the same as those during the detection of the 100MHz antenna, the detection of the 9 measuring lines is repeated, and finally two main-frequency geologic radar profile achievements are obtained;
s3, comparing and analyzing the data processing results of the 100MHz and 500MHz radars, and enclosing a strip-shaped electromagnetic abnormal area with strong reflected wave amplitude, greater than 1m of in-phase axis transverse and inward travel difference and greater than 20ns of longitudinal time difference. The region with the strong amplitude of the reflected wave and the strip-shaped in-phase axis was estimated as void, and the region with the strong amplitude of the reflected wave and the hyperbolic-shaped in-phase axis was estimated as void, as shown in fig. 2. And counting the electromagnetic anomaly of the geological radar according to four contents of a survey line number, an abnormal mileage interval, an abnormal depth range, an abnormal description and the like, and marking the electromagnetic anomaly on a survey line plane layout chart by using a red small line segment. As shown in fig. 1.
And S4, determining the range of geological grouting to be within 34-53 m of mileage and the grouting depth to be 2m according to the geological radar electromagnetic anomaly statistical result in the step S3 and the electromagnetic anomaly plane distribution characteristics shown in the figure 1, and continuously monitoring the settlement condition of the road observation point after grouting is finished.
And S5, if the road surface subsidence is still unstable in the working well construction process, repeating the detection work of the high-low frequency antenna combined geological radar from the step S2 to the step S4 until the road surface subsidence is stable.
The above embodiments are described in connection with the accompanying drawings, but not to be construed as limiting the scope of the invention, and it should be noted that, for those skilled in the art, the technical solutions obtained by equivalent replacement or equivalent change can be obtained without departing from the spirit of the present invention, and all of them are within the scope of the present invention.
Claims (9)
1. A method for rapidly detecting roadbed diseases is characterized by comprising the following steps: it comprises the following steps:
s1, arranging a plurality of displacement monitoring points in an area with the most obvious road settlement, arranging a plurality of geological radar measuring lines in the road settlement area and the peripheral area thereof in the direction parallel to the road, and marking the edges of the road with red paint one by one at certain intervals from the end points of the measuring lines;
s2, detecting geological radars loaded with two different main-frequency shielding antennas one by one on a designed measuring line, and marking a mark on an acquired radar profile map when the antennas move to a red paint marking position to obtain two main-frequency geological radar profile results;
s3, comparing and analyzing the processing results of the geological radar data under the two main frequencies, enclosing an electromagnetic abnormal area which has strong amplitude and a certain extension scale or approximate hyperbolic shape in the horizontal and longitudinal directions of a same phase axis, counting the electromagnetic abnormality of the geological radar according to the subentry content, and marking the electromagnetic abnormality on a survey line plane layout chart;
s4, evaluating the void and cavity development conditions of the roadbed and the underlying soil body according to the radar analysis result, determining the range and depth of geological grouting according to the void and cavity development conditions, and continuously monitoring the settlement condition of the road observation point after grouting;
s5, if the monitoring result shows that the settlement is stable after grouting is finished, the grouting effect is good; if the sedimentation is still unstable, the steps S2 to S4 are repeatedly performed until the monitoring result shows that the sedimentation is stable.
2. The method for rapidly detecting the roadbed diseases according to claim 1, characterized in that: in step S1, 10m is set for each fixed distance.
3. The method for rapidly detecting roadbed diseases according to claim 1, wherein the geological radar in step S1 is MA L A geological radar.
4. The method for rapidly detecting the roadbed diseases according to claim 1, characterized in that: in step S2, the two different main frequencies are 100MHz and 500MHz, respectively.
5. The method for rapidly detecting the roadbed diseases according to claim 1, characterized in that: in step S3, the homophase axes have a certain extension scale in the transverse and longitudinal directions so as to satisfy that the difference between the transverse and inward distances of the homophase axes is greater than 1m and the longitudinal time difference is greater than 20 ns.
6. The method for rapidly detecting the roadbed diseases according to claim 1, characterized in that: in step S3, the sub-items include a line number, an abnormal mileage interval, an abnormal depth range, and an abnormal description.
7. The method for rapidly detecting the roadbed diseases according to claim 1, characterized in that: in the step S4, the evaluation of the void development of the roadbed and the underlying soil body shows that the radar abnormal features corresponding to the void are reflected as strong reflected wave amplitude, and the event is in a strip shape.
8. The method for rapidly detecting the roadbed diseases according to claim 1, characterized in that: in the step S4, the evaluation of the cavity growth conditions of the roadbed and the underlying soil body shows that the radar abnormal characteristics corresponding to the cavities are reflected as strong reflected wave amplitude, and the event of the event is hyperbolic.
9. The method for rapidly detecting the roadbed diseases according to claim 1, characterized in that: the sedimentation is stabilized in step S5 to a daily observed sedimentation displacement of less than 3 mm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010248962.4A CN111424633A (en) | 2020-04-01 | 2020-04-01 | Method for rapidly detecting roadbed diseases |
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| CN202010248962.4A CN111424633A (en) | 2020-04-01 | 2020-04-01 | Method for rapidly detecting roadbed diseases |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485834A (en) * | 2020-11-23 | 2021-03-12 | 云南航天工程物探检测股份有限公司 | Three-dimensional detection and imaging method for multi-lane roadbed |
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| CN108457673A (en) * | 2018-02-05 | 2018-08-28 | 北京交通大学 | Geologic radar detection guard method in newly built tunnels neighboring tunneling existing tunnel hole |
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2020
- 2020-04-01 CN CN202010248962.4A patent/CN111424633A/en active Pending
Patent Citations (4)
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| CN105064188A (en) * | 2015-07-30 | 2015-11-18 | 江苏省交通规划设计院股份有限公司 | Ground penetrating radar complete equipment-based pavement structure internal quality evaluation method |
| CN108457673A (en) * | 2018-02-05 | 2018-08-28 | 北京交通大学 | Geologic radar detection guard method in newly built tunnels neighboring tunneling existing tunnel hole |
| CN109440610A (en) * | 2018-12-18 | 2019-03-08 | 江苏中路工程技术研究院有限公司 | A kind of pavement crack width, depth determination method and quick maintenance method based on Ground Penetrating Radar |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112485834A (en) * | 2020-11-23 | 2021-03-12 | 云南航天工程物探检测股份有限公司 | Three-dimensional detection and imaging method for multi-lane roadbed |
| CN112485834B (en) * | 2020-11-23 | 2022-07-15 | 云南航天工程物探检测股份有限公司 | Three-dimensional detection and imaging method for multi-lane roadbed |
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