CN105239609B - Underground continuous wall leakage detection method - Google Patents
Underground continuous wall leakage detection method Download PDFInfo
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- CN105239609B CN105239609B CN201510669561.5A CN201510669561A CN105239609B CN 105239609 B CN105239609 B CN 105239609B CN 201510669561 A CN201510669561 A CN 201510669561A CN 105239609 B CN105239609 B CN 105239609B
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- diaphram wall
- resistivity
- resistivity profile
- leakage detection
- pit dewatering
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- 238000001514 detection method Methods 0.000 title claims abstract description 41
- 238000012360 testing method Methods 0.000 claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000001556 precipitation Methods 0.000 claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000002347 injection Methods 0.000 claims description 4
- 239000007924 injection Substances 0.000 claims description 4
- 238000004826 seaming Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 230000035945 sensitivity Effects 0.000 abstract description 2
- 230000005856 abnormality Effects 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 abstract 1
- 238000009412 basement excavation Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 230000000875 corresponding effect Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 238000005266 casting Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 235000008429 bread Nutrition 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005008 domestic process Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Abstract
The invention relates to the field of geotechnical engineering detection and test, in particular to an underground continuous wall leakage detection method. The method is characterized in that the inner side and the outer side of an underground continuous wall are each provided with multiple test holes; resistivity detection is conducted on two adjacent test holes in the same side in sequence before and after foundation pit dewatering, and the resistivity profiles between the two adjacent test holes are worked out according to the detection result; the resistivity profiles of the same position before and after foundation pit dewatering are compared, if it is found that low-resistance abnormality exists in the resistivity profile after foundation pit dewatering compared with the resistivity profile before foundation pit dewatering, it is judged that leakage occurs to the position, corresponding to the low-resistance abnormal resistivity profile, of the underground continuous wall. The underground continuous wall leakage detection method has the beneficial effects that the amount of collected data is large, the detection resolution ratio is high, sensitivity to the resistivity difference is high, and a good effect is achieved on the aspect of ground wall leakage detection; and leakage detection can be conducted on a certain segment of the underground continuous wall at a time, and meanwhile, no influence on the structural body of the underground continuous wall is generated.
Description
Technical field
The present invention relates to rock and soil engineering detection and field tests, and in particular to diaphram wall leakage detection method.
Background technology
As developing rapidly for urban underground space construction, foundation ditch project are more and more, not only foundation ditch area is gradually increased,
Excavation of foundation pit depth is also increasingly deeper, and diaphram wall has been obtained extensively as a kind of good deep footing groove enclosing structure of combination property
General application.It is limited to the factors such as construction technology, joint form, the ground environment impact of diaphram wall so that body of wall presence is oozed
The probability increase of leakage hidden danger, seriously threatens the construction safety of foundation ditch.In recent years, as national all kinds of Large Foundation Pits build item
Purpose constantly starts, and during excavation of foundation pit, because of diaphram wall seepage, caused all kinds of accidents are of common occurrence for various places.
Therefore foundation pit enclosure structure how was found out before excavation of foundation pit with the presence or absence of hidden leakage defect, and necessity is taken before excavation, is had
The reinforcement measure in advance of effect, it is to avoid because of the various risks of ground wall seepage generation during excavation, it has also become be badly in need of solving for one in industry
A difficult problem.
At present the domestic method for diaphram wall leak detection mainly has boring and coring, sound wave transmission method etc..Drilling
Core sample method needs to drill on diaphram wall body and extract concrete core sample, judges that underground connects by observing its appearance features
Continuous wall is with the presence or absence of defects such as seepages.Acoustic wave transmission rule was needed before ground wall concrete casting, in its internal possible generation
The pre-buried related test tube in structural weak position of seepage, after concrete casting, at two（Or it is multiple）Sound detecting pipe is respectively implanted sound
Energy emitter and receptor, judge ground wall with the presence or absence of the defect for causing seepage according to the acoustic velocity and amplitude that measure.Two kinds
Method can not integrally detect to diaphram wall, and wherein boring and coring belongs to and damages detection method, to wall body structure sheet
Body has destruction, it is impossible to which large area is carried out；Sound wave transmission method needs pre-buried test tube, can increase construction cost, and affects work of constructing
Phase.
The content of the invention
The purpose of the present invention is according to above-mentioned the deficiencies in the prior art, there is provided diaphram wall leakage detection method, is led to
Cross and compare that base pit dewatering is forward and backward, resistivity between the hole of the instrument connection of diaphram wall both sides judges that diaphram wall whether there is
The position and scope of seepage and breakthrough.
The object of the invention is realized being completed by technical scheme below：
A kind of diaphram wall leakage detection method, the seepage of the diaphram wall being arranged on for detection in foundation ditch, its
It is characterised by：Some instrument connections are opened up respectively in the inside and outside both sides of the diaphram wall；In forward and backward point of the base pit dewatering
Two not adjacent to homonymy successively instrument connections carry out Resistivity testing, and according to testing result two neighboring instrument connection is calculated
Between resistivity profile；The resistivity profile at the forward and backward same position of the comparison base pit dewatering, if foundation ditch drop
There is low-resistance exception compared to the resistivity profile before precipitation in resistivity profile after water, then position corresponding to the resistivity profile
There is seepage in the diaphram wall put.
Solion hand-hole is opened up on the outside of the foundation ditch, it is continuous that the solion hand-hole is located at the underground
The outside of the instrument connection on the outside of wall, injects low-resistance solion, the low-resistance ion in the solion hand-hole
The injection process of solution with the foundation ditch Precipitation Process；The electricity at the forward and backward same position of the comparison base pit dewatering
Resistance rate section, if there is low-resistance exception compared to the resistivity profile before precipitation in the resistivity profile after the base pit dewatering,
There is seepage in the diaphram wall of position corresponding to the resistivity profile.
The resistivity profile at the forward and backward same position of the comparison base pit dewatering, judges that the diaphram wall is
No position and the scope that there is seepage and breakthrough.
Line described in homonymy between instrument connection covers the section to be detected of the diaphram wall；Adjacent two of homonymy
Line between instrument connection covers the seaming position of the diaphram wall.
The instrument connection is arranged in parallel in the both sides of the diaphram wall.
It is an advantage of the invention that：Gathered data amount is big, detection resolution is high, to advantages such as resistivity contrasts sensitivities, on ground
Wall leak detection aspect achieves preferable effect；Disposably leak detection can be carried out to certain section of diaphram wall, while right
The structure of diaphram wall itself does not produce any impact.
Description of the drawings
Fig. 1 is the first arrangement schematic diagram of the present invention；
Fig. 2 is second arrangement schematic diagram of the present invention；
Fig. 3 is the construction process figure of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing feature of present invention and other correlated characteristics are described in further detail by embodiment, so as to
In the understanding of technical staff of the same trade：
As Figure 1-3, labelling 1-4, A1-A4, B1-B4, Y1-Y2 are respectively in figure：Diaphram wall 1, cable 2, inspection
Survey instrument 3, seam 4, instrument connection A1-A4, instrument connection B1-B4, solion hand-hole Y1-Y2.
Embodiment one：As shown in figure 1, diaphram wall 1 is arranged in foundation ditch（Foundation ditch is not shown）, it is right that the present embodiment is used for
Position and scope on the body of wall of diaphram wall with the presence or absence of seepage and breakthrough is detected.
The leakage detection method of diaphram wall 1 is comprised the following steps in the present embodiment：
1）Arrangement hole position：As shown in figure 1, in the inside and outside both sides of foundation ditch, apart from the both sides certain limit of diaphram wall 1
Inside open up instrument connection A1-A4, instrument connection B1-B4.Instrument connection A1-A4, B1-B4 of the inside and outside both sides of foundation ditch should connect respectively away from underground
Continuous wall 1-2m, if the distance between instrument connection and diaphram wall are too remote, cannot the seepage region of wall over the ground carry out effectively
Detection.The line of instrument connection A1-A4 and the line of instrument connection B1-B4 with the keeping parallelism of diaphram wall 1, and underground is continuous
The position of the inside and outside both sides each two instrument connection of wall 1 relative to diaphram wall 1 in symmetrical laying, instrument connection A1-B1 in such as Fig. 1,
A2-B2、A3-B3、A4-B4；So, resistivity imaging two dimensional cross-section result map between continuous measured hole hole can be formed, i.e.,
The resistivity profile of A1-B1 sections can be spliced with the resistivity profile of A2-B2 sections, form instrument connection A1-A2（B1-B2）Scope
Interior resistivity profile, is easy to subsequently compare the resistivity contrasts of the inside and outside both sides of diaphram wall 1, so as to complete that underground is connected
The positioning of breakthrough and form are recognized in the detection zone of continuous wall 1.Instrument connection opens up position while to ensure respectively located underground
Line between the instrument connection of the inside and outside both sides of diaphragm wall 1 to cover detection in need diaphram wall section.
2）First time data acquisition：It is adjacent to the homonymy of the inside and outside both sides of diaphram wall 1 by cable and detecting instrument 3
Carry out across hole resistivity CT detection for the first time between two instrument connections respectively successively, that is, detect the resistivity value between instrument connection,
And using this test result as normal resistance rate background value in stratum between instrument connection.As shown in figure 1, detection object includes：A1-
A2、A2-A3、A3-A4、B1-B2、B2-B3、B3-B4。
3）Base pit dewatering.
4）Second data acquisition：After base pit dewatering is basically completed, again to the inside and outside both sides of diaphram wall 1
Carry out second across hole resistivity CT detection between the two neighboring instrument connection of homonymy respectively successively, that is, detect the electricity between instrument connection
Values of resistivity.As shown in figure 1, detection object includes：A1-A2、A2-A3、A3-A4、B1-B2、B2-B3、B3-B4.
5）Data processing and judgement：The resistivity data of instrument connection twice to collecting carries out Inversion Calculation, obtains two
Resistivity profile between the hole of individual instrument connection.Relatively base pit dewatering is forward and backward, the resistivity profile at same position, if a certain resistance
The same position of rate section after drainage of foundation pit compared to drainage of foundation pit before there is low-resistance exception, then judge the resistivity profile
In corresponding diaphram wall 1 there is seepage in a certain position of a certain section.And why can produce low-resistance and be because extremely,
If seepage occurs in diaphram wall, due to the intervention of subsoil water, blowby area is relative to the structural integrity region of diaphram wall 1
Resistivity value is relatively low, especially after base pit dewatering relative to precipitation before low-resistance more project extremely.Contrast base pit dewatering is forward and backward
Resistivity profile also can determine whether the scope of breakthrough.
Embodiment two：The present embodiment is compared to the difference of embodiment one：As shown in Fig. 2 opening on the outside of foundation ditch
Solion hand-hole Y1, Y2 are provided with, outside the instrument connection A1-A3 in the solion hand-hole Y1-Y2 outsides of diaphragm wall 1 located underground
Side.As shown in figure 3, after the completion of first time detection work, into solion hand-hole Y1, Y2 suitable concentration is injected separately into
Low-resistance solion, while with the Precipitation Process in foundation ditch, the both sides for making diaphram wall 1 maintain certain differential water pressures, base
Subsoil water on the outside of hole can flow into foundation ditch, if diaphram wall 1 has seepage, then solion injection on the outside of foundation ditch
The low-resistance solion injected in hole Y1, Y2 can flow to foundation ditch inner side by the breakthrough of diaphram wall 1.So in " data
Processing and when judging " resistivity profile that detects for second can more for the first time detect the relative normal resistance of section in the region
There is low-resistance exception in rate background value, and the situation abnormal compared to the low-resistance of embodiment one is more notable, more accurate so as to realize
Breakthrough position and scope judgement.
As shown in Fig. 2 the line between the adjacent instrument connection of homonymy covers the seam 4 of diaphram wall 1, such as seam 4
In instrument connection A1-A2（B1-B2）、A2-A3（B2-B3）Between, it is to avoid it is exactly in survey as the seam 4 of the suitable happening part of seepage
On the vertical line direction of prospect hole and diaphram wall so that the resistivity profile figure between instrument connection can intuitively, significantly show
Change in resistance at seam 4, so as to improve accuracy of detection, it is to avoid survey by mistake, leak hunting.
Above-described embodiment is in the specific implementation：Detecting instrument 3 can select in hole electrical instrument to gather between two instrument connections
Voltage, current data, need to be laid respectively in the drilling of side relative two during data acquisition by certain intervals, quantity
The multicore cable of electrode composition, multicore cable is connected to the instrument host on ground, and the electrode in an instrument connection is transmitting
Electrode, the electrode in another corresponding instrument connection is receiving electrode.Electrode spacing in multicore cable is according to detection hole depth
Degree selects 0.2m, 0.5m or 1.0m, and in the case where number of poles is certain, the size of electrode spacing is directly proportional to detection depth, visits
The depth of survey is bigger, then electrode spacing is bigger.
Pitch of holes between instrument connection A1-A4, B1-B4 according to field condition and need to need to detect the scope of diaphram wall 1
Determine, generally equivalent to test the 1/3-1/2 of hole depth, but less than 10m, because if the pitch of holes of instrument connection is too big, then
The propagation of electrical signals that emission electrode from an instrument connection sends away from too far away, and be located at the receiving electrode in another instrument connection will
Useful signal cannot be received, last result of detection is affected.
The depth of instrument connection A1-A4, B1-B4 should determine according to the depth of diaphram wall to be checked 1, due to being located at two respectively
Emission electrode and receiving electrode in instrument connection carries out at an angle the transmitting and reception of electric current, will be formed between instrument connection
The mutually electric current ray pair of oblique, therefore the upper and lower certain distance between the hole that last inverting is obtained in resistivity profile
The detection blind area of a triangle, i.e. false data inside can be formed, for the data profile bread depth containing maximum probe for obtaining detection
All effective informations in degree, therefore test hole depth need to be more than the depth of diaphram wall to be checked 1 in engineering, typically require more than
Ground to be checked wall 5m or so.Meanwhile, the depth of solion hand-hole Y1, Y2 should be shallower than the depth of instrument connection, if because ion
Solution injection hole Y1, Y2 are too deep, are unfavorable for the Horizontal Movement of solion so as to which effect cannot be realized, and increase unnecessary
Engineering cost.
Claims (5)
1. a kind of diaphram wall leakage detection method, the seepage of the diaphram wall being arranged on for detection in foundation ditch, it is special
Levy and be：Some instrument connections are opened up respectively in the inside and outside both sides of the diaphram wall；In the forward and backward difference of the base pit dewatering
Two adjacent to homonymy successively instrument connections carry out Resistivity testing, according to testing result be calculated two neighboring instrument connection it
Between resistivity profile；The resistivity profile at the forward and backward same position of the comparison base pit dewatering, if the base pit dewatering
There is low-resistance exception compared to the resistivity profile before precipitation in resistivity profile afterwards, then position corresponding to the resistivity profile
The diaphram wall there is seepage.
2. a kind of diaphram wall leakage detection method according to claim 1, it is characterised in that：In the outer of the foundation ditch
Side opens up solion hand-hole, and the solion hand-hole is located at the outer of the instrument connection on the outside of the diaphram wall
Side, injects low-resistance solion in the solion hand-hole, and the injection process of the low-resistance solion is with described
The Precipitation Process of foundation ditch；The resistivity profile at the forward and backward same position of the comparison base pit dewatering, if the base pit dewatering
There is low-resistance exception compared to the resistivity profile before precipitation in resistivity profile afterwards, then position corresponding to the resistivity profile
The diaphram wall there is seepage.
3. a kind of diaphram wall leakage detection method according to claim 1, it is characterised in that：The comparison foundation ditch drop
The resistivity profile at the forward and backward same position of water, judges the diaphram wall with the presence or absence of seepage and breakthrough
Position and scope.
4. a kind of diaphram wall leakage detection method according to claim 1, it is characterised in that：Instrument connection described in homonymy
Between line cover the section to be detected of the diaphram wall；Line between two adjacent instrument connections of homonymy covers institute
State the seaming position of diaphram wall.
5. a kind of diaphram wall leakage detection method according to claim 1, it is characterised in that：The instrument connection is parallel
It is arranged in the both sides of the diaphram wall.
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106013198B (en) * | 2016-05-31 | 2018-05-08 | 中铁第四勘察设计院集团有限公司 | Foundation pit enclosure structure gap pre-processes construction method |
| CN106838630B (en) * | 2016-12-26 | 2021-11-26 | 上海勘察设计研究院(集团)有限公司 | Method for detecting leakage of large-scale drainage pipe culvert |
| CN108760745A (en) * | 2018-04-12 | 2018-11-06 | 上海建工集团股份有限公司 | Diaphram wall seam leakage inspector and method |
| CN108844684A (en) * | 2018-04-17 | 2018-11-20 | 中国矿业大学 | A method of monitoring diaphram wall seam crossing leakage scenarios |
| CN109610525A (en) * | 2018-12-04 | 2019-04-12 | 中国十七冶集团有限公司 | A kind of method of quick judgement water-stop curtain construction quality |
| CN111535373A (en) * | 2020-05-12 | 2020-08-14 | 中建六局水利水电建设集团有限公司 | Deep foundation pit water-proof curtain leakage detection method |
| CN112924945B (en) * | 2021-03-10 | 2023-09-22 | 大连理工大学 | Underground continuous wall model test system based on cross-hole radar imaging |
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Address after: 200032 18, building 681, Xiao Mu Qiao Road, Xuhui District, Shanghai. Patentee after: Shanghai Survey, Design and Research Institute (Group) Co.,Ltd. Country or region after: China Address before: 200032 18, building 681, Xiao Mu Qiao Road, Xuhui District, Shanghai. Patentee before: SHANGHAI GEOTECHNICAL INVESTIGATIONS & DESIGN INSTITUTE Co.,Ltd. Country or region before: China |