CN102012508A - Method for advanced prediction of U-shaped geology by ground penetrating radar - Google Patents
Method for advanced prediction of U-shaped geology by ground penetrating radar Download PDFInfo
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- CN102012508A CN102012508A CN 201010297919 CN201010297919A CN102012508A CN 102012508 A CN102012508 A CN 102012508A CN 201010297919 CN201010297919 CN 201010297919 CN 201010297919 A CN201010297919 A CN 201010297919A CN 102012508 A CN102012508 A CN 102012508A
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Abstract
The invention relates to a method for the advanced prediction of U-shaped geology by a ground penetrating radar. By the method, various occurrence structural planes and unfavorable geologic bodies in the front of construction working faces are predicated completely to improve the accuracy and comprehensiveness of the prediction and fulfill the aim of comprehensive, accurate and effective prediction. The technical scheme to solve the problem comprises the following steps of: arranging U-shaped radar measuring lines on the tunnel construction working faces, and measuring along the measuring lines by using the ground penetrating radar; processing the measured data, and performing time-depth conversion to form a radar image; and cutting the radar image, finding the position of each radar reflected wave event in the image, and analyzing comprehensively by combining geological data and early prediction outcomes to determine geologic structures in the front of the working faces. The method can be used for the advanced prediction of the geological condition of tube or tunnel construction working faces.
Description
Technical field
The present invention relates to a kind of ground penetrating radar U type geological advanced prediction method.Be applicable to the advanced prediction of tunnel or tunnel construction face geological state.
Background technology
In the tunnel or during the tunnel construction face, used the structural plane of ground penetrating radar method forecast front of tunnel heading or plastid poorly widely, be commonly called as the geology advanced prediction.When advanced prediction is implemented in tunnel (road) hole in the past, generally arrange " one " word or " ten " word, " well " font recording geometry at face.According to the radar detection principle, the recording geometry that is arranged in the construction face can only be surveyed and be close to parallel with face or be the structural plane of the little angle of cut and plastid poorly, and can't forecast and be close to hang down hand over face or be the structural plane of the big angle of cut and plastid poorly, cause thus and fail to report structural plane or plastid poorly, have a strong impact on the accuracy of the forecast and the value of forecasting.
Summary of the invention
The technical problem to be solved in the present invention is: a kind of ground penetrating radar U type geological advanced prediction method is provided, can to the construction the various occurrence structural planes of front of tunnel heading and poorly plastid carry out omnibearing forecast, to improve accuracy of the forecast, comprehensive, reach purpose comprehensive, accurate and effective forecast.
The technical solution adopted in the present invention is: ground penetrating radar U type geological advanced prediction method is characterized in that comprising step:
1) arranges one or two U type radar surveys line;
2) begin test from the right wall starting point of tunnel, Yan Youbi, face be to left wall test, and test again after step pitch 20cm, radar antenna are close to the hole wall and keep steady marks at two corner locations, and test to left wall terminal point finishes;
3) carry out frequency spectrum, filtering and gain recovery analyzing and processing with backup data files, dark conversion forms radar image when selecting the relative dielectric constant of this suitable stratum media to carry out;
4) excise the image border with image processing software, 1: 1 ratio in length and breadth is set, and image is cut into three of left, center, right by the turning markings, and in CAD figure, set up radar image by survey line position and same ratio;
5) analysis-by-synthesis radar image and stratum, geological condition are discerned the position of each radar return lineups;
6) forecast that in conjunction with geologic information and early stage achievement carries out analysis-by-synthesis and geologic interpretation, determine that front of tunnel heading and face are close to the tectonic structure of parallel or the little angle of cut and sidewall and face and are close to the hang down friendship or the tectonic structure of the angle of cut greatly;
7) sidewall survey is found be close to hang down with face handed over or the tectonic structure of the big angle of cut, puts off front of tunnel heading according to its trend, thereby determines the various tectonic structures that move towards of front of tunnel heading.
The invention has the beneficial effects as follows: will the construct radar survey line of face of this method extends back along the two side, form " U " type electronic skyscreen, survey respectively in the left and right sidewall to be close to hang down with left and right sides wall survey line and hand over or the structural plane and the plastid poorly of the angle of cut greatly with face; Survey the structural plane of front of tunnel heading or the little angle of cut intimate parallel and plastid poorly with the face survey line with face, " U " type recording geometry of Zu Chenging has covered construction face and left and right sides sidewall thus, can to the construction the various occurrence structural planes of front of tunnel heading and poorly plastid carry out omnibearing forecast, greatly improve accuracy of the forecast, comprehensive, reached purpose comprehensive, accurate and effective forecast.
Description of drawings
Fig. 1 is the system layout of the embodiment of the invention.
Fig. 2 is the radar image of ground penetrating radar U type geology advanced prediction of the present invention.
Embodiment
The present invention increases the radar survey line by the left and right sidewall at the construction face and forms " U " type electronic skyscreen, with left and right wall survey line is respectively to survey in the left and right sidewall to be close to hang down with face to hand over or the structural plane of the big angle of cut and plastid poorly, and extend to the place ahead of face according to its trend, survey the structural plane of front of tunnel heading or the little angle of cut intimate parallel and plastid poorly with the face side line with face, thus to the structural plane of the various occurrence of front of tunnel heading and poorly plastid carry out omnibearing forecast.The following (see figure 1) of concrete steps:
1, generally speaking, only arrange a U type radar survey line (low line 4) for increasing work efficiency, when the front of tunnel heading geologic condition is complicated, can arrange high line 5, low 4 two U types of line radar survey line;
2, begin test from right wall 1 starting point of tunnel, to left wall 3 tests, test again after step pitch 20cm, radar antenna are close to the hole wall and keep steady marks in two turning A, B position along right wall 1, face 2, and test to left wall terminal point finishes;
3, carry out the analyzing and processing of frequency spectrum, filtering and gain recovery etc. with backup data files, dark conversion forms radar image when selecting the relative dielectric constant of this suitable stratum media to carry out;
4, excise the image border with image processing software, 1: 1 ratio in length and breadth is set, and image is cut into three of left, center, right by the turning markings, and in CAD figure, set up radar image (as shown in Figure 2) by survey line position and same ratio;
5, analysis-by-synthesis radar image and stratum, geological condition are discerned the position of each radar return lineups { being the line of the extreme value that each road reflection wave phase place is identical on the radar record (being commonly called as crest or trough) };
6, forecast that in conjunction with geologic information and early stage achievement carries out analysis-by-synthesis and geologic interpretation, determine that front of tunnel heading and face are close to the tectonic structure of parallel or the little angle of cut and sidewall and face and are close to the hang down friendship or the tectonic structure of the angle of cut greatly;
7, sidewall survey is found be close to hang down with face handed over or the tectonic structure of the big angle of cut, put off front of tunnel heading according to its trend and (see the extended line of structural plane 6 among Fig. 2, go ahead and extend to the place ahead of face), thus realize moving towards architectonic comprehensive forecast to front of tunnel heading is various.
This method can effectively be forecast the structural planes of the different trends of construction front of tunnel heading and plastid poorly, only effectively stop face forecast existence to the failing to report of big angle of cut structural plane, greatly improve accuracy of the forecast, the comprehensive and value of forecasting.
Claims (1)
1. ground penetrating radar U type geological advanced prediction method is characterized in that comprising step:
1) arranges one or two U type radar surveys line;
2) begin test from the right wall starting point of tunnel, Yan Youbi, face be to left wall test, and test again after step pitch 20cm, radar antenna are close to the hole wall and keep steady marks at two corner locations, and test to left wall terminal point finishes;
3) carry out frequency spectrum, filtering and gain recovery analyzing and processing with backup data files, dark conversion forms radar image when selecting the relative dielectric constant of this suitable stratum media to carry out;
4) excise the image border with image processing software, 1: 1 ratio in length and breadth is set, and image is cut into three of left, center, right by the turning markings, and in CAD figure, set up radar image by survey line position and same ratio;
5) analysis-by-synthesis radar image and stratum, geological condition are discerned the position of each radar return lineups;
6) forecast that in conjunction with geologic information and early stage achievement carries out analysis-by-synthesis and geologic interpretation, determine that front of tunnel heading and face are close to the tectonic structure of parallel or the little angle of cut and sidewall and face and are close to the hang down friendship or the tectonic structure of the angle of cut greatly;
7) sidewall survey is found be close to hang down with face handed over or the tectonic structure of the big angle of cut, puts off front of tunnel heading according to its trend, thereby determines the various tectonic structures that move towards of front of tunnel heading.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201010297919 CN102012508A (en) | 2010-09-28 | 2010-09-28 | Method for advanced prediction of U-shaped geology by ground penetrating radar |
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| CN 201010297919 CN102012508A (en) | 2010-09-28 | 2010-09-28 | Method for advanced prediction of U-shaped geology by ground penetrating radar |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616390A (en) * | 2013-07-03 | 2014-03-05 | 江西理工大学 | Non-destructive detection method for cemented filling body roof fracture state |
| CN106291542A (en) * | 2015-07-08 | 2017-01-04 | 云南航天工程物探检测股份有限公司 | A kind of tunnel three-D imaging method |
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2010
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| US6549012B2 (en) * | 2001-06-07 | 2003-04-15 | Larry G. Stolarczyk | Radio system for characterizing and outlining underground industrial developments and facilities |
| CN1904644A (en) * | 2006-08-08 | 2007-01-31 | 武汉长盛工程检测技术开发有限公司 | Network tunnel real time continuous leading preinforming method and device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103616390A (en) * | 2013-07-03 | 2014-03-05 | 江西理工大学 | Non-destructive detection method for cemented filling body roof fracture state |
| CN103616390B (en) * | 2013-07-03 | 2016-05-04 | 江西理工大学 | A kind of cemented fill top board crack state lossless detection method |
| CN106291542A (en) * | 2015-07-08 | 2017-01-04 | 云南航天工程物探检测股份有限公司 | A kind of tunnel three-D imaging method |
| CN106291542B (en) * | 2015-07-08 | 2018-08-17 | 云南航天工程物探检测股份有限公司 | A kind of tunnel three-D imaging method |
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Application publication date: 20110413 |