CN109188426B - Method for detecting grouting quality of shield segment wall by using geological radar - Google Patents
Method for detecting grouting quality of shield segment wall by using geological radar Download PDFInfo
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- CN109188426B CN109188426B CN201810932194.7A CN201810932194A CN109188426B CN 109188426 B CN109188426 B CN 109188426B CN 201810932194 A CN201810932194 A CN 201810932194A CN 109188426 B CN109188426 B CN 109188426B
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- Prior art keywords
- cushion block
- shield segment
- geological radar
- wall
- grouting
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/88—Radar or analogous systems specially adapted for specific applications
- G01S13/885—Radar or analogous systems specially adapted for specific applications for ground probing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/30—Assessment of water resources
Abstract
The invention discloses a method for detecting grouting quality after shield segment wall by using geological radar, which comprises the steps of firstly placing a nonmagnetic cushion block on the inner wall of a shield segment, then placing the geological radar on the cushion block for detection, wherein the arc shape of the surface of the cushion block, which is in contact with the shield segment, is consistent, and the thickness of the cushion block is 15-30 cm.
Description
Technical Field
The invention relates to the technical field of shield tunnel construction, in particular to a method for detecting grouting quality of a shield segment wall by using geological radar.
Background
When a shield tunnel is constructed, a certain gap exists between a segment and a stratum, in order to prevent the stratum from deforming and improve the impermeability, the early stability of the segment lining is ensured, grouting is needed to be carried out to the gap according to a certain grouting pressure and grouting quantity, the current grouting quantity is determined by taking the gap of the shield tail as a basis and combining factors such as the stratum, a line and a tunneling mode and considering proper filling coefficients, the grouting pressure is determined by considering whether the stratum is split and the earth covering pressure, the dependence on experimental values is large, the diffusion condition of slurry behind the segment wall and the condition of a soil body are not clear, and the characteristics of the slurry, such as flowability, bleeding, permeability and the like, and the characteristics of the stratum where the tunnel is located and the like are not necessarily uniform, so that various defects can be formed, and the situation of grouting behind the shield wall is mastered, and the method has important significance for ensuring the safety of the tunnel structure.
The geological radar is also called ground penetrating radar, is a nondestructive geophysical detection method for determining the distribution condition of an underground medium by adopting high-frequency electromagnetic waves, is widely applied to detection of grouting quality after shield segment walls at present, and provides important basis for settlement control, secondary grouting and compensation grouting of a shield tunnel in subsequent construction by detecting the distribution form of grouting bodies in the radial direction and the length direction of a tunnel and gaps (namely the thickness and defects of the grouting bodies) between the grouting bodies and the tunnel segments, so that filling conditions and construction quality of the grouting bodies between the segments and soil bodies are rapidly mastered. However, when geological radar is used for detecting the grouting quality behind the shield segment wall, various electromagnetic interferences are often received on site, the situation that the grouting quality behind the wall cannot be accurately identified is detected, and through research, the problem that the radar secondary reflected wave signal of the shield segment overlaps with the reflected wave signal of the grouting layer behind the wall is the main problem that cannot be identified, so that the technical difficulty that the grouting quality behind the shield segment wall is urgently broken through when geological radar is used for detecting the grouting quality behind the shield segment wall is solved.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the method can solve the problem that the radar secondary reflected wave signal of the shield segment and the reflected wave signal of the grouting layer behind the wall overlap and cannot be effectively detected.
The technical scheme adopted by the invention is as follows: the method comprises the steps of firstly placing a nonmagnetic cushion block on the inner wall of a shield segment, then placing the geological radar on the cushion block for detection, enabling the arc shapes of the surfaces of the cushion block and the shield segment, which are in contact with each other, to be consistent, and enabling the thickness of the cushion block to be 15-30 cm.
Preferably, the thickness of the cushion block is 25cm.
Preferably, the antenna frequency of the geological radar is 200 MHz-900 MHz.
According to the method for detecting the grouting quality behind the shield segment wall by using the geological radar, the nonmagnetic cushion block is placed on the shield segment inner wall, and the cushion block is added to be equivalent to adding a medium interface between the cushion block and the shield segment, so that the distance between the receiving and transmitting antenna of the geological radar is changed, the primary radiation field intensity of electromagnetic waves is improved, the secondary reflection field intensity is suppressed, the receiving antenna receives the reflection signals in the strongest distribution range of the primary field reflection waves of the electromagnetic waves, the resolution of the reflection waves of the grouting layer is obviously improved, and the grouting quality behind the shield segment wall is accurately detected.
Drawings
FIG. 1 is a schematic diagram of the structure of the method of the present invention when in use.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings and examples.
As shown in fig. 1, according to the method for detecting grouting quality after shield segment wall by using geological radar, firstly, a nonmagnetic cushion block 2 is placed on the inner wall of a shield segment 3, then geological radar 1 is placed on the cushion block 2 for detection, the arc shapes of the surfaces of the cushion block 2 and the shield segment 3, which are in contact with each other, are consistent, namely, the cushion block 2 is tightly attached to the inner wall of the shield segment 3, the thickness of the cushion block 2 is 15-30 cm, the length and the width of the cushion block 2 are such that the receiving and transmitting antennas of the geological radar 1 are all positioned on the surface of the cushion block 2 and do not exceed the surface, and the cushion block 2 is prevented from being placed at the joint of the two shield segments 3 or on bolts of the shield segment 3.
In the implementation of the invention, the thickness of the cushion block 2 is preferably 25cm; the antenna frequency of the geological radar 1 is 200 MHz-900 MHz.
The added cushion block 2 is equivalent to adding a medium interface between the cushion block and the shield segment 3, so that the distance between the receiving and transmitting antenna of the geological radar 1 is changed, the primary radiation field intensity of electromagnetic waves is improved, the secondary reflection field intensity is suppressed, the receiving antenna receives the reflection signals in the strongest distribution range of the primary field reflection waves of the electromagnetic waves, the resolution of the reflection waves of the grouting layer is obviously improved, and the post-grouting quality of the shield segment wall is accurately detected.
The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by this patent.
Claims (1)
1. A method for detecting grouting quality behind shield segment walls by using geological radar is characterized by comprising the following steps: firstly, a nonmagnetic cushion block is placed on the inner wall of a shield segment, then a geological radar is placed on the cushion block for detection, the arc shape of the surface, which is in contact with the shield segment, of the cushion block is consistent, the thickness of the cushion block is 25cm, the length and the width of the cushion block enable receiving and transmitting antennas of the geological radar to be positioned on the surface of the cushion block and not exceed the surface, and the antenna frequency of the geological radar is 200 MHz-900 MHz;
the added cushion block is equivalent to adding a medium interface between the cushion block and the shield segment, so that the distance between the receiving and transmitting antenna of the geological radar is changed, the primary radiation field intensity of electromagnetic waves is improved, the secondary reflection field intensity is suppressed, the receiving antenna receives the reflection signals in the strongest distribution range of the primary field reflection waves of the electromagnetic waves, the resolution of the reflection waves of the grouting layer can be obviously improved, and the grouting quality after the shield segment wall is accurately detected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810932194.7A CN109188426B (en) | 2018-08-16 | 2018-08-16 | Method for detecting grouting quality of shield segment wall by using geological radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810932194.7A CN109188426B (en) | 2018-08-16 | 2018-08-16 | Method for detecting grouting quality of shield segment wall by using geological radar |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109188426A CN109188426A (en) | 2019-01-11 |
| CN109188426B true CN109188426B (en) | 2023-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810932194.7A Active CN109188426B (en) | 2018-08-16 | 2018-08-16 | Method for detecting grouting quality of shield segment wall by using geological radar |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111828043B (en) * | 2020-06-29 | 2022-06-28 | 上海隧道工程有限公司 | Method for monitoring diffusion range of synchronous grouting slurry of shield tail of large-diameter shield |
| CN112302683B (en) * | 2020-10-26 | 2021-04-30 | 昆山市建设工程质量检测中心 | Model manufacturing method for simulating shield segment wall post-grouting defect |
| CN114019134B (en) * | 2021-08-23 | 2023-05-05 | 长安大学 | Combined type shield tunnel wall back grouting simulation device and test method |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9400829D0 (en) * | 1994-01-18 | 1994-03-16 | Percival David T | Extruded tunnel lining shield |
| CN2676194Y (en) * | 2003-12-29 | 2005-02-02 | 同济大学 | Testing device for geological radar detection of shield tunnel backfilled grout |
| CN102418531B (en) * | 2011-12-14 | 2013-12-11 | 中铁十二局集团有限公司 | Tunneling construction method for directly removing overpass group piles by using shield machine |
| CN103352704B (en) * | 2013-07-29 | 2015-07-15 | 北京住总集团有限责任公司 | Construction method for enabling tunnel shield to pass through vertical shaft structure |
| CN105863656B (en) * | 2016-04-07 | 2018-08-24 | 国家电网公司 | A kind of shield driving method |
| CN107448203A (en) * | 2016-06-01 | 2017-12-08 | 江西省交通科学研究院 | A kind of shield tunnel geological disaster detection means and its detection method |
| CN107575250B (en) * | 2017-09-30 | 2018-10-23 | 康泰卓越（北京）建筑科技有限公司 | Operation phase duct pieces of shield tunnel seam blowby area method for blocking and radical cure method for maintaining |
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