CN106320393A - Leak detection method for underground diaphragm wall in soft soil area - Google Patents
Leak detection method for underground diaphragm wall in soft soil area Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
The invention discloses a leak point detection method for an underground diaphragm wall in a soft soil area. The defects that construction is complex, measurement is difficult, and the accuracy degree of the measurement result is low are overcome, and meanwhile the specific positions of leak points are measured accurately. The hidden leak points of the underground diaphragm wall in the soft soil area can be accurately detected, and the method is simple and practicable, convenient to operate and short in construction period. In addition, by means of the method, the reinforcement effect can be achieved on soft soil, the water content of the soft soil can be remarkably reduced within a short time, the undrained shear strength of the soft soil is improved, the sensitivity of the soft soil is reduced, and the reinforcement effect of the soft soil is irreversible. A detection device for achieving the detection method comprises an observation well, a precipitation well, aluminum electrodes and a powering-on device. The observation well is located on the outer side of a foundation pit and used for observing changes of the underground water level on the outer side of the foundation pit. The precipitation well is located on the inner side of the foundation pit and used for observing the underground water level on the inner side of the foundation pit. The aluminum electrodes are electrodes needed for an electroosmosis method. The powering-on device is located on the ground and provides a positive power source and a negative power source for the aluminum electrodes.
Description
Technical field
The present invention relates to a kind of diaphram wall leakage detection method, it is adaptable to the seepage of diaphram wall in foundation pit enclosure
Detection, belongs to technical field of building construction.
Background technology
During construction of diaphragm wall, in order to prevent diaphram wall seepage from causing the accident, often detect before construction
The leakage scenarios of diaphram wall, ensures deep pit monitor.In foundation pit enclosure designs, diaphram wall has waterproof effect
Really, but still having the pit failure of more than 70% is that water damage is caused directly or indirectly, the most then cause foundation ditch to scrap, go along with sb. to guard him knot
Structure collapses, heavy then jeopardize safety of surrounding environment, cause people life property loss.Therefore, the water proof for diaphram wall is imitated
The detection of fruit seems most important, and some at present conventional detection methods generally have two classes, the first kind be hydrogeology infer with
Geophysical exploration method, such as temperature inside and outside change in resistance detection, foundation ditch inside and outside hydrogeology deduction, resistivity method, foundation ditch
Degree change-detection etc..
1) hydrogeology is inferred
Before foundation ditch does not excavates, generally acknowledge that preferable detection method is foundation ditch in curtain to carry out bailing test come really both at home and abroad
Determine hidden leakage defect position.But this method cannot complete the detection of single seam, can only burst district, and the mark of leak source cannot be confirmed
The information such as height, quantity, it is impossible to instruct next step plugging operation.
2) geophysical exploration method
(1) resistivity
Before the internal precipitation of foundation ditch, the soil layer resistivity at detection measuring point；After the internal precipitation of foundation ditch, at detection measuring point
Soil layer resistivity；If undergoing mutation before and after soil layer resistivity, then it is the position of latent breakthrough at this measuring point.
(2) temperature field
By the change of percolating water Yu ambient temperature, determine whether seepage.
(3) electrode
Bury electrodes of A underground in the curtain foundation ditch central vertical not yet excavated, a current electrode B be set in foundation ditch periphery,
It is driven underground.Be connected to electronic compensation instrument, by positive and negative (or negative and positive) transitional phenomenon occurs on Vl (x)/I curve, positive and negative between
Zero point correspond to existence position and the degree of depth of hidden leakage defect.
(4) artificial heat and underground water temperature
Outside foundation ditch, boring applies thermal source, makes temperature in borehole rising of holing outside foundation ditch, if water stopping curtain seepage, then heat
Source can flow to inside foundation ditch, such that it is able to monitoring is out.
Method to water stopping curtain seepage detection above, has measurement relatively difficult, constructs more complicated, and for measuring
The accuracy of result holds bad shortcoming.
Equations of The Second Kind is by the bailing test in diaphram wall, detects the overall water proof effect of diaphram wall, this
Method needs to set water level observation hole outside diaphram wall, judges underground by observing pump process middle water level situation of change
The water proof effect of diaphragm wall and the general location of breakthrough.But this method needs to set a large amount of water level observation hole specially, executes
The work duration is longer, costly, additionally the water level span outside hole is bigger, it is impossible to accomplish continuous arrangement, it is easy to miss one
A little latent breakthroughs, and the exact position of breakthrough cannot be obtained.
Summary of the invention
In order to solve that the detection construction of diaphram wall breakthrough is complicated, measure difficulty, measurement result accuracy is relatively low etc. no
Foot, a kind of soft clay area diaphram wall breakthrough detection method that the present invention provides, effectively solve construction complexity, measure
The deficiencies such as difficulty, measurement result accuracy are relatively low, accurate can measure the particular location of breakthrough simultaneously.This method is not
But can realize that soft clay area diaphram wall is lain concealed breakthrough accurately to detect, and simple, easy to operate, the duration
Short.It addition, the method can reach the effect reinforced to weak soil, weak soil energy water content within a short period of time significantly reduces, and improves
The undrained shear strength of weak soil also reduces weak soil sensitivity, and reinforcement of soft soil effect is irreversible.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of soft clay area diaphram wall breakthrough detection method, it is achieved the detection device of this detection method includes observation
Well, dewatering well, aluminum electrode and power device, described inspection well is positioned at the outside of foundation ditch, is used for observing subsoil water outside foundation ditch
The change of position；Described dewatering well is dewatering well inside foundation ditch, can be used to the level of ground water observed inside foundation ditch；Described aluminum electricity
The extremely electrode needed for electro-osmosis method；Described power device rest on the ground, for aluminum electrode provide positive and negative electrode power supply, described time
Receiving method comprises the steps:
1) to carrying out bailing test inside foundation ditch, the SEA LEVEL VARIATION of inspection well outside observation foundation ditch, if the water level of inspection well
Do not have greatly changed, then there is not breakthrough in diaphram wall；If the water level of observation has greatly changed, then underground is even
There is breakthrough in continuous wall.
2) using aluminum electrode to carry out electric osmose, aluminum electrode uses has radiosiotope aluminum, discharges during electric osmose
Aluminium ion there is radioactivity, on the ground by radioactive measurement is drawn aluminum ions transition process, seepage can be drawn
The horizontal level of point, stops electric osmose.
3) effective method is then taked to measure the upright position of breakthrough, because during electric osmose, aluminium ion meeting
Concentrate on breakthrough position in a large number, cause aluminium ion concentration near breakthrough to increase, can be by detection aluminium ion concentration size
Determine the upright position of breakthrough, aluminium ion concentration measuring instrument or chemical method can be used to measure aluminium ion concentration.
4) vertical direction is divided into several equidistant minizones, at pre-test aluminium ion concentration or the cation of electric osmose
Concentration, compare during electric osmose, aluminium ion concentration measuring instrument, cation concentration measuring instrument or change can be used
The method learned is measured.
5) measure terminate after, switch on power beginning electric osmose, the aluminum ions concentration of monitoring real-time during electric osmose or
The concentration of person's cation, by with electric osmose before aluminium ion concentration or cation concentration compare, draw the vertical position of breakthrough
Put.
6) horizontal level that combination is measured and upright position draw the concrete breakthrough position of diaphram wall.
Further, the distance of described inspection well should determine according to the practical situation of engineering, and described dewatering well can directly use
The original dewatering well of foundation ditch, the aluminum in described aluminum electrode should have radioactivity, described power device include power device positive pole with
Power device negative pole, the power supply reserves of power device are sufficiently large, and described Soft Soil Layer is electro-osmosis method suitable soil layer, described aluminium ion
Should have radioactivity.
Described step 1) in, start subsoil water inside and outside foundation ditch and be in poised state, foundation ditch inside dewatering well is drawn water,
Cause subsoil water disequilibrium inside and outside foundation ditch, thus the water level of foundation ditch outward appearance well logging changes；
Described step 2) in, aluminum electrode has radioactivity, penetrates the aluminium ion put and have radioactivity equally during electric osmose,
During electric osmose, use detection of radioactive the instrument aluminum ions transition process of detection of radioactive on the ground, draw aluminum from
The final horizontal level assembled of son, i.e. breakthrough horizontal level.
Described step 4) in, the detection to breakthrough upright position uses split-run, if being divided into detection bottom on ground
Dry equal detection is interval, uses each interval aluminium ion of method detection or the content of cation of instrument or chemistry,
Thus the upright position of breakthrough can be drawn.This detection method determines according to aluminum ions character, is obtained by test,
During electric osmose, if there is breakthrough in water-stop curtain, then aluminium ion can be collected near breakthrough in a large number, causes breakthrough attached
Nearly aluminium ion concentration or cation concentration uprise.
The technology of the present invention is contemplated that: dewatering well, to foundation ditch inside precipitation, is become by observation foundation ditch external observation Well Water Level
Changing and judge whether foundation ditch exists seepage, if there is seepage, then detecting the particular location of breakthrough.By electric osmosis principle, to aluminum electricity
Pole carries out electric osmose, and the aluminum in aluminum electrode should have radioactivity, during electric osmose, uses detection of radioactive instrument at ground detection aluminum
The migration path of ion, thus the horizontal level of available breakthrough.Can draw from the situation of test, ooze if water-stop curtain exists
Leakage, aluminium ion can be concentrated on the position of seepage in a large number, thus can be come by the aluminium ion concentration before and after electric osmose or cation concentration
Determine the upright position of breakthrough.In order to determine that the upright position of breakthrough uses the principle of segmentation, according to water determined above
Mean place, inside ground-connecting-wall, from ground to detection bottom vertical height in, be classified as several equidistant communities
Between, measure aluminium ion concentration or cation concentration in each interval respectively, its result is contrasted before electric osmose, draws breakthrough
Upright position.Horizontal level is combined with upright position, the particular location of available breakthrough.
Diaphram wall can not only be detected and lie concealed the position of breakthrough, and there is simple to operate, easy construction, cost
Low, speed is fast, safety is high, accuracy advantages of higher.
Beneficial effects of the present invention is mainly manifested in: (1) accuracy is high.It is determined by horizontal level to come really with upright position
Determine the particular location of breakthrough, and the determination of upright position, accuracy can be changed by the size of demarcation interval.(2) become
This is low, and economic and social benefit is good.The material that this method uses is common, and consumption is few, causes damage far below ground-connecting-wall seepage, and
And reducing consumption, social economy's property is profitable.(3) simple, easy to operate.Need not operating personnel is proposed high request,
Common workman can complete through simple training.(4) reduce water content, reinforce the passive area soil body.Base is made during electric osmose
The internal subsoil water in hole flows out to outside, makes weak soil water content within a short period of time significantly reduce, and the not draining that improve weak soil resists
Cut intensity and reduce weak soil sensitivity, and reinforcement of soft soil effect is irreversible.
Accompanying drawing explanation
Fig. 1 is foundation ditch site plan of the present invention；
Fig. 2 is electro-osmosis method of the present invention detection breakthrough plan-position principle schematic；
Fig. 3 is that electro-osmosis method of the present invention detects breakthrough profile position schematic diagram；
Fig. 4 is that electro-osmosis method of the present invention detects breakthrough section design sketch；
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.
With reference to Fig. 1～Fig. 4, a kind of soft clay area diaphram wall leakage detection method, described ground-connecting-wall 1 is for examine
The ground-connecting-wall surveyed, described inspection well 2, through Soft Soil Layer 4, is used for observing the change of level of ground water outside foundation ditch, between inspection well 2
Determining according to Practical Project away from the degree of depth, inspection well 2 can act also as dewatering well outside foundation ditch, and described dewatering well 3 is through Soft Soil Layer
4, for dewatering well inside foundation ditch, can be used to the level of ground water observed inside foundation ditch, described aluminum electrode 5 is divided into anelectrode and negative electricity
Pole, is inserted in Soft Soil Layer 4, and the internal aluminum electrode of foundation ditch connects anelectrode, connects negative electrode, described power device 6 outside foundation ditch
Including positive pole and negative pole, positive and negative electrode power supply, power device positive pole 7 is provided to be connected with aluminum electrode in foundation ditch for aluminum electrode 5, energising
Device negative pole 8 aluminum electrode outer with foundation ditch is connected, and described power device positive pole 7 is connected with aluminum electrode anode, and described power device is born
Pole 7 is connected with aluminum Electrode Negative, and in described hole, ground 9 is the natural ground elevation inside foundation ditch, and outside described hole, ground 10 is base
Natural ground elevation outside hole, described breakthrough 11 exists and on diaphram wall, for the latent seepage of diaphram wall
Point, described aluminium ion 12 by during electric osmose the penetrated releasing of aluminum electrode 5 there is radioactive aluminium ion, described detection method bag
Include following steps:
1) to carrying out bailing test inside foundation ditch, the SEA LEVEL VARIATION of inspection well outside observation foundation ditch, if the water level of inspection well
Do not have greatly changed, then there is not breakthrough in diaphram wall；If the water level of observation has greatly changed, then underground is even
There is breakthrough in continuous wall.
2) using aluminum electrode to carry out electric osmose, aluminum electrode uses has radiosiotope aluminum, discharges during electric osmose
Aluminium ion there is radioactivity, on the ground by radioactive measurement is drawn aluminum ions transition process, seepage can be drawn
The horizontal level of point, stops electric osmose.
3) effective method is then taked to measure the upright position of breakthrough, because during electric osmose, aluminium ion meeting
Concentrate on breakthrough position in a large number, cause amount of positive ions near breakthrough to increase, can by test aluminium ion concentration size with
How many amount of positive ions determines the upright position (this method is analyzed as a example by detection aluminium ion concentration) of breakthrough.
4) vertical direction is divided into several equidistant minizones, at pre-test aluminium ion concentration or the cation of electric osmose
Concentration, compare during electric osmose, aluminium ion concentration measuring instrument, cation concentration measuring instrument or change can be used
The method learned is measured.
5) measure terminate after, switch on power beginning electric osmose, the aluminum ions concentration of monitoring real-time during electric osmose or
The concentration of person's cation, by with electric osmose before aluminium ion concentration or cation concentration compare, draw the vertical position of breakthrough
Put.
6) horizontal level that combination is measured and upright position draw the concrete breakthrough position of diaphram wall.
Further, the distance of described inspection well should determine according to the practical situation of engineering, and described dewatering well can directly use
The original dewatering well of foundation ditch, the aluminum in described aluminum electrode should have radioactivity, described power device include power device positive pole with
Power device negative pole, the power supply reserves of power device are sufficiently large, and described Soft Soil Layer is electro-osmosis method suitable soil layer, described aluminium ion
Should have radioactivity.
Described step 1) in, start subsoil water inside and outside foundation ditch and be in poised state, foundation ditch inside dewatering well is drawn water,
Cause subsoil water disequilibrium inside and outside foundation ditch, thus the water level of foundation ditch outward appearance well logging changes；
Described step 2) in, aluminum electrode has radioactivity, penetrates the aluminium ion put and have radioactivity equally during electric osmose,
During electric osmose, use detection of radioactive the instrument aluminum ions transition process of detection of radioactive on the ground, draw aluminum from
The final horizontal level assembled of son, i.e. breakthrough horizontal level.
Described step 4) in, the detection to breakthrough upright position uses split-run, if being divided into detection bottom on ground
Dry equal detection is interval, uses each interval aluminium ion of method detection or the content of cation of instrument or chemistry,
Thus the upright position of breakthrough can be drawn.This detection method determines according to aluminum ions character, is obtained by test,
During electric osmose, if there is breakthrough in water-stop curtain, then aluminium ion can be collected near breakthrough in a large number, causes breakthrough attached
Nearly aluminium ion concentration or cation concentration uprise.
The cutting depth of certain foundation ditch is 15.95m, and using diaphram wall is that building enclosure is held concurrently water-stop curtain, and underground is continuous
The wall degree of depth is 24.5m, and thickness is 800mm, and strength grade of concrete is C30, foundation ditch girth 400m.It it is Important building around foundation ditch
Thing and road, building all has reinforced concrete foundation and pile foundation, the soil layer ground based on weak soil, in this engineering 8. layer circle gravel
Lower water tool pressure-bearing character, this water-bearing layer water yield relative abundance, phreatic table about the 2m on head height top to be less than, level of ground water
Buried depth is shallow, and deep layer artesian aquifer infiltration coefficient is big, how to consider that precipitation is extremely important on surrounding enviroment impact.Due to this
Foundation depth is relatively deep, and underground condition is more complicated, if ground-connecting-wall exists seepage, immeasurable loss will occur.Therefore excavation of foundation pit
Before diaphram wall leak detection is seemed extremely important.
The embodiment of breakthrough detection method lain concealed by the soft clay area diaphram wall of the present embodiment:
1) device each several part size is determined.Near the internal diaphram wall 1 of foundation ditch, at intervals squeeze into precipitation
Well 3, this example spacing takes 5m, and dewatering well 3 uses tube well dewatering.Near the outside diaphram wall 1 of foundation ditch, separated by a distance beat
Entering inspection well 2, this example spacing takes 5m.The length of aluminum electrode 5 is consistent with the degree of depth of diaphram wall 1, if diaphram wall 1 is deep
Degree is relatively deep, and layering can be used to measure.Vertical direction minizone divides spacing and selects 500mm, and the interval number of this example is 49.
2) detect whether to there is breakthrough.To carrying out bailing test inside foundation ditch, the water level of inspection well 2 outside observation foundation ditch
Change, if the water level of inspection well 2 does not has greatly changed, then there is not breakthrough 11 in diaphram wall 1；If inspection well 2
Water level has greatly changed, then diaphram wall 1 exists breakthrough 11.
3) detection breakthrough horizontal level.Respectively two aluminum electrodes 5 are inserted the inside and outside both sides of foundation ditch, by the aluminum in foundation ditch
Electrode 5 is connected with power device positive pole 7, and the aluminum electrode 5 outside foundation ditch is connected with power device negative pole 8, and aluminum electrode 5 uses to have and puts
Injectivity isotope aluminum.Opening power device 6 and carry out electric osmose, during electric osmose, the aluminium ion 12 of release has radioactivity,
By radioactive measurement being drawn the transition process of aluminium ion 12 on ground, the horizontal level of breakthrough 11 can be drawn, stopping
Electric osmose.
4) breakthrough upright position measuring principle.During electric osmose, aluminium ion 12 can concentrate on breakthrough position in a large number
Put, cause aluminium ion 12 increasing number near breakthrough, breakthrough 11 can be determined by test aluminium ion 12 concentration
Upright position.
5) breakthrough upright position is measured.Vertical direction is divided into several equidistant minizones, and this example with 500mm is
One is interval, is divided into 49, and the method first passing through sampling measures original aluminum ion 12 concentration in each interval, then starts electricity
Oozing, during electric osmose, the sample under Real-time Collection each interval, different depth, measures the concentration of aluminium ion 12, by measure
The result book of final entry, measuring instrument can use the method for aluminium ion concentration measuring instrument or chemistry to measure.
6) breakthrough upright position determines.Aluminium ion 12 concentration that each period, each depth survey are gone out and front period
Aluminium ion 12 concentration of same position compares, and can draw the change of different depth aluminium ion 12 concentration during electric osmose and become
Gesture, from electric osmose start to finish, if it is relatively big to there is a certain position aluminium ion 12 concentration change, then illustrates that this position is breakthrough 11
Upright position.
7) breakthrough position determines.Specifically oozing of diaphram wall 1 is drawn in conjunction with the horizontal level measured and upright position
Leak source 11 position.
Claims (2)
1. a soft clay area diaphram wall breakthrough detection method, it is achieved the detection device of this detection method includes observation
Well, dewatering well, aluminum electrode and power device, described inspection well is positioned at the outside of foundation ditch, is used for observing subsoil water outside foundation ditch
The change of position；Described dewatering well is dewatering well inside foundation ditch, can be used to the level of ground water observed inside foundation ditch；Described aluminum electricity
The extremely electrode needed for electro-osmosis method；Described power device rest on the ground, for aluminum electrode provide positive and negative electrode power supply, described time
Receiving method comprises the steps:
1) to carrying out bailing test inside foundation ditch, the SEA LEVEL VARIATION of inspection well outside observation foundation ditch, if the water level of inspection well is not sent out
Raw bigger change, then there is not breakthrough in diaphram wall；If the water level of observation has greatly changed, then diaphram wall
There is breakthrough, enter the 2nd) step；
2) using aluminum electrode to carry out electric osmose, aluminum electrode uses has radiosiotope aluminum, the aluminum of release during electric osmose
Ion has radioactivity, on the ground by radioactive measurement is drawn aluminum ions transition process, can draw breakthrough
Horizontal level, stops electric osmose；
3) effective method is then taked to measure the upright position of breakthrough: during electric osmose, aluminium ion can be concentrated in a large number
In breakthrough position, cause aluminium ion concentration near breakthrough to increase, determine seepage by detection aluminium ion concentration size
The upright position of point；
4) vertical direction is divided into several equidistant minizones, dense at the pre-test aluminium ion concentration of electric osmose or cation
Degree, compares during electric osmose, can use aluminium ion concentration measuring instrument, cation concentration measuring instrument or chemistry
Method is measured；
5), after measuring and terminating, switch on power beginning electric osmose, the aluminum ions concentration of monitoring real-time during electric osmose or just
The concentration of ion, by with electric osmose before aluminium ion concentration or cation concentration compare, draw the upright position of breakthrough；
6) horizontal level that combination is measured and upright position draw the concrete breakthrough position of diaphram wall.
2. the method for claim 1, it is characterised in that step 3) in, determined by detection aluminium ion concentration size
The upright position of breakthrough, concrete employing aluminium ion concentration measuring instrument or chemical method measure aluminium ion concentration.
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| CN107816639A (en) * | 2017-11-17 | 2018-03-20 | 段清明 | Underground water seepage detection system and detection method based on electrochemistry |
| CN108562518A (en) * | 2018-02-12 | 2018-09-21 | 浙江大学 | A kind of device and method for studying heavy metal ion traveling locus in the Polluted Soil that electric osmose is handled |
| CN108844684A (en) * | 2018-04-17 | 2018-11-20 | 中国矿业大学 | A method of monitoring diaphram wall seam crossing leakage scenarios |
| CN110629810A (en) * | 2019-10-11 | 2019-12-31 | 南京林业大学 | Model test device and test method for determining influence of arrangement of water-proof baffle on foundation pit electroosmosis effect |
| 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 |
| CN113176044A (en) * | 2021-04-15 | 2021-07-27 | 中铁四局集团有限公司 | Underground diaphragm wall leakage detection method based on tracer |
| CN113203527A (en) * | 2021-05-22 | 2021-08-03 | 崇金玲 | Method for detecting leakage point position of underground concrete continuous wall |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107816639A (en) * | 2017-11-17 | 2018-03-20 | 段清明 | Underground water seepage detection system and detection method based on electrochemistry |
| CN108562518A (en) * | 2018-02-12 | 2018-09-21 | 浙江大学 | A kind of device and method for studying heavy metal ion traveling locus in the Polluted Soil that electric osmose is handled |
| CN108562518B (en) * | 2018-02-12 | 2023-06-30 | 浙江大学 | Device and method for researching migration track of heavy metal ions in electroosmosis treated polluted soil |
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| CN110629810A (en) * | 2019-10-11 | 2019-12-31 | 南京林业大学 | Model test device and test method for determining influence of arrangement of water-proof baffle on foundation pit electroosmosis effect |
| CN110629810B (en) * | 2019-10-11 | 2023-08-22 | 南京林业大学 | Model test device and test method for determining influence of water-proof baffle plate setting on foundation pit electroosmosis effect |
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| CN113176044A (en) * | 2021-04-15 | 2021-07-27 | 中铁四局集团有限公司 | Underground diaphragm wall leakage detection method based on tracer |
| CN113176044B (en) * | 2021-04-15 | 2023-05-30 | 中铁四局集团有限公司 | Underground diaphragm wall leakage detection method based on tracer |
| CN113203527A (en) * | 2021-05-22 | 2021-08-03 | 崇金玲 | Method for detecting leakage point position of underground concrete continuous wall |
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