CN102392461A - Method for detecting hidden leakage point on waterproof curtain of foundation pit - Google Patents
Method for detecting hidden leakage point on waterproof curtain of foundation pit Download PDFInfo
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- CN102392461A CN102392461A CN201110267962XA CN201110267962A CN102392461A CN 102392461 A CN102392461 A CN 102392461A CN 201110267962X A CN201110267962X A CN 201110267962XA CN 201110267962 A CN201110267962 A CN 201110267962A CN 102392461 A CN102392461 A CN 102392461A
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Abstract
The invention discloses a method for detecting a hidden leakage point on a waterproof curtain of a foundation pit. The method comprises the following steps of: forming a detection point at a position which is a fixed distance away from the waterproof curtain outside the foundation pit along a direction parallel to the waterproof curtain; detecting the soil layer electric resistivity at the detection point before internal precipitation of the foundation pit; detecting the soil layer electric resistivity at the detection point after internal precipitation of the foundation pit; and if the soil layer electric resistivity changes suddenly before and after, determining that the detection point is the position of the hidden leakage point. The detection method is simple and convenient, and leakage points can be detected accurately.
Description
Technical field
The invention belongs to underground engineering field, relate to the detection of breakthrough, especially the detection method of the latent breakthrough of foundation ditch water-stop curtain.
Background technology
The waterproof structure of base pit engineering is divided into two types, adopts non-individual bodies such as diaphragm wall or interlock stake to go along with sb. to guard him form, and fender body itself has the water proof function concurrently, also can be described as water-stop curtain; And for other such as the going along with sb. to guard him of discontinuous body such as perfusion campshed etc., need be in the fender body outside, the water-stop curtain of constructing specially (agitation pile, high-pressure rotary jet grouting pile etc.), water-stop curtain comprises above-mentioned two types of situation in this manual.Though; Nearly all base pit engineering all is provided with waterproof structure; Still having the base pit engineering accident more than 70% is that water damage directly or indirectly causes, and causes then gently that foundation ditch is scrapped, space enclosing structure is collapsed, heavy then jeopardize surrounding enviroment safely, cause the people life property loss.Therefore; Detection for the water proof effect of base pit engineering seems most important; Some detection methods commonly used at present have two types usually; The first kind is uniaxial compressive strength detections, GCO probe GCO of method such as the curtain induration of indirectly reflection curtain construction quality etc., but all can not accurately estimate curtain integral body water proof effect.Second type is through the pumping test in the fender body; Detect the whole water proof effect of curtain; This method need set the water level peep hole outside bracing of foundation pit, judge the water proof effect of water-stop curtain and the general location of latent leak source through observing pump process middle water level situation of change.But this method need set a large amount of water level peep holes specially; Construction period is long, expense is higher, and the water level span outside the hole is bigger in addition, can not accomplish continuous arrangement; Be easy to miss some latent breakthroughs, spent big price but do not obtain good effect.And this method can well solve the defective of above-mentioned two class methods.
Electrical prospecting is that the difference with electrical properties between rock, the ore is the basis; In the space or temporal characteristic distributions and Changing Pattern, find out that subsurface geological structure and the underground electrical heterogeneous body of searching (karst, weathered layer, sliding mass etc.) one type is reconnoitred geophysical method through observation and the research electric field relevant or electromagnetic field with these differences.In hydrogeology, engineering geology, environmental geology work, electrical prospecting also is a kind of requisite means of reconnoitring.Resistivity method is one of conducting electrical method exploitation method; It is based upon in the earth's crust between all kinds of rocks (ore deposit) stone on the basis of conductivity difference; Through observing and studying the natural electric field relevant or the regularity of distribution of artificial electric field, can reach the purpose of finding out geological structure or solving some geological problem with this species diversity.And resistivity sounding is a kind of of resistivity method, and it provides the data of geoelectric cross section with change in depth, to confirm each layer depth, thickness and electrical quantity (apparent resistivity etc.), can obtain apparent resistivity isopleth section (cloud) figure through resistivity sounding.
Summary of the invention
The object of the present invention is to provide a kind of foundation ditch water-stop curtain to lie concealed the breakthrough detection method,, confirm the breakthrough position of water-stop curtain based on resistivity sounding.
For reaching above purpose, the solution that the present invention adopted is:
A kind of foundation ditch water-stop curtain is lain concealed the breakthrough detection method, and it comprises:
Outside at foundation ditch, along the water-stop curtain parallel direction, lay measuring point apart from water-stop curtain fixed length distance;
Before the inner precipitation of foundation ditch, survey the soil layer resistivity at measuring point place;
Behind the inner precipitation of foundation ditch, survey the soil layer resistivity at measuring point place;
If undergo mutation before and after the soil layer resistivity, then this measuring point place is the position of latent breakthrough.
Further, said fixed length distance apart from water-stop curtain is 0.8-1.2m.
The measuring point of said laying, spacing is at 20-200cm between its adjacent measuring point.
The soil layer resistivity at said detection measuring point place is to adopt the resistivity sounding exploration.
Owing to adopted such scheme, the present invention to have following characteristics: detection method of the present invention, simple and convenient, can detect breakthrough accurately.
Description of drawings
Fig. 1 wherein, (a) is cross-sectional drawing for the inside and outside water level distribution map in hole, (b) is the sectional drawing along 1-1 line in (a).
Fig. 2 is the sketch map that the resistivity sounding measuring point is laid.
Fig. 3 is a resistivity distribution comparison diagram before and after the precipitation.
The specific embodiment
Below in conjunction with the accompanying drawing illustrated embodiment the present invention is further described.
Water electric conductivity is higher, is generally less than 100 Ω m, for soil layer, short texture; Degree of porosity is big, and resistivity and underground water are closely related, so their resistivity is all lower; Be generally n * 10 Ω m, under the identical situation of soil nature, the saturation ratio of dry ground, wet soil or soil layer is different; Resistivity is very different, and this is because resistivity of water is less, moisture what with the resistivity of appreciable impact soil layer.
The present invention is based on the resistivity sounding principle, consider that water content has appreciable impact to the resistivity of soil layer, when in the foundation ditch hole during precipitation; If there are breakthrough in fender body or water-stop curtain,, cheat outer water seepage in the hole because there is head difference; Cheat near the drawdown of outer breakthrough, soil moisture in layer reduces, and resistivity increases; Through the resistivity isopleth profile that obtains before and after the contrast precipitation, the tangible position of isopleth changes in distribution is exactly latent breakthrough position.
As shown in Figure 1, soil body resistivity measurement is carried out in water-stop curtain 1 outside, owing to be that water-stop curtain 1 outside exists breakthrough 2 outside the hole, so the groundwater table decreasing of 1. locating among the figure, just, soil body water content reduces, resistivity will obviously increase.Because the soil body is made up of soil particle and intergranular hole, under the normal water-free situation; This soil body resistivity is apparently higher than resistivity of water, and the reduction of soil body resistivity (or rising) mainly is controlled by the size of fill liquid resistivity in the hole, when the hole water-filling; Measured is the comprehensive resistivity of the two, and because the low-resistance characteristic of water causes soil body resistivity obviously to reduce; After water level reduces outside the hole; Pore water oozes out, and promptly water content reduces, thus in the scope that reduces of water level soil body resistivity around soil layer raise relatively
Therefore, the present invention along water-stop curtain 1 parallel direction, apart from laying measuring point about water-stop curtain 1m, forms a measuring point laying face 4 parallel with water-stop curtain 1 outside the hole.Lay each measuring point on the face 4 for measuring point, the selection of the spacing between the measuring point is difficult for excessive, and is promptly more little good more, but considers Work-Load Factor, and general range of choice is crossed affects resolution ratio at 20cm-200cm.
In the hole, carry out the resistivity sounding exploration before the precipitation, survey the soil layer resistivity at each measuring point place on the outer soil layer resistivity in the hole measuring point laying just face 4, obtain resistivity isopleth profile, (ρ among the figure shown in dotted line among Fig. 3
1-ρ
4Be meant the resistivity at each measuring point place).When precipitation in the hole put 3 places carry out precipitation after water level when making it (being generally the following 1-2m of excavation face); Carry out the resistivity sounding exploration once more and survey the soil layer resistivity that measuring point is laid each measuring point place on the face 4; Obtain the resistivity isogram, shown in solid line among Fig. 3.Two isopleth profiles that obtain before and after the contrast precipitation, the position of resistivity distribution sudden change is exactly the position of latent breakthrough.Because the resistivity sounding prospecting has been known technology, so do not give unnecessary details at this.
The above-mentioned description to embodiment is can understand and use the present invention for ease of the those of ordinary skill of this technical field.The personnel of skilled obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not breaking away from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.
Claims (4)
1. a foundation ditch water-stop curtain is lain concealed the breakthrough detection method, and it is characterized in that: it comprises:
Outside at foundation ditch, along the water-stop curtain parallel direction, lay measuring point apart from water-stop curtain fixed length distance;
Before the inner precipitation of foundation ditch, survey the soil layer resistivity at measuring point place;
Behind the inner precipitation of foundation ditch, survey the soil layer resistivity at measuring point place;
If undergo mutation before and after the soil layer resistivity, then this measuring point place is the position of latent breakthrough.
2. foundation ditch water-stop curtain as claimed in claim 1 is lain concealed the breakthrough detection method, it is characterized in that: said fixed length distance apart from water-stop curtain is 0.8-1.2m.
3. foundation ditch water-stop curtain as claimed in claim 1 is lain concealed the breakthrough detection method, it is characterized in that: the measuring point of said laying, spacing is at 20-200cm between its adjacent measuring point.
4. foundation ditch water-stop curtain as claimed in claim 1 is lain concealed the breakthrough detection method, it is characterized in that: the soil layer resistivity at said detection measuring point place is to adopt the resistivity sounding exploration.
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| CN201110267962XA CN102392461A (en) | 2011-09-09 | 2011-09-09 | Method for detecting hidden leakage point on waterproof curtain of foundation pit |
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| CN201110267962XA CN102392461A (en) | 2011-09-09 | 2011-09-09 | Method for detecting hidden leakage point on waterproof curtain of foundation pit |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103835321A (en) * | 2014-03-14 | 2014-06-04 | 洛阳理工学院 | Simple device for horizontal displacement monitoring |
| CN105239609A (en) * | 2015-10-16 | 2016-01-13 | 上海岩土工程勘察设计研究院有限公司 | Underground continuous wall leakage detection method |
| CN105297753A (en) * | 2015-10-16 | 2016-02-03 | 上海交通大学 | Determining method of hydrogeololgy parameters under the action of waterproof curtains |
| CN105604066A (en) * | 2015-12-25 | 2016-05-25 | 天津市勘察院 | Application of resistivity profiling method to detection of building foundation pit support structure water leakage |
| CN110006595A (en) * | 2019-03-20 | 2019-07-12 | 中铁四局集团有限公司 | A kind of Retaining Structure of Extra-deep Excavation plane leakage detection method |
| CN110763400A (en) * | 2019-09-16 | 2020-02-07 | 光大环保(盐城)固废处置有限公司 | Method and system for detecting defects of vertical impervious curtain |
| 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 |
| CN113027521A (en) * | 2021-02-03 | 2021-06-25 | 淮北矿业股份有限公司 | Method for evaluating whole-area dredging effect after closure of curtain |
| CN115288215A (en) * | 2022-08-23 | 2022-11-04 | 北京地矿工程建设有限责任公司 | Method for predicting water leakage of leakage point of waterproof curtain |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11283146A (en) * | 1998-03-30 | 1999-10-15 | Nohmi Bosai Ltd | Water leakage and water stagnation alarm system utilizing sprinkler facility |
| JP2003121294A (en) * | 2001-10-16 | 2003-04-23 | Osaka Gas Co Ltd | Gas leaking position detection method and device |
| CN201034749Y (en) * | 2007-04-09 | 2008-03-12 | 中国水利水电科学研究院 | Geothermometry system for detecting dam leakage circulation path |
| CN101339087A (en) * | 2008-08-26 | 2009-01-07 | 江苏华东建设基础工程有限公司 | Rapid detector system for water stopping curtain seepage channel and detection method |
| CN101639540A (en) * | 2009-06-25 | 2010-02-03 | 江苏华东地质建设集团有限公司 | Method for detecting seepage passage hidden trouble of waterproof curtain |
-
2011
- 2011-09-09 CN CN201110267962XA patent/CN102392461A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11283146A (en) * | 1998-03-30 | 1999-10-15 | Nohmi Bosai Ltd | Water leakage and water stagnation alarm system utilizing sprinkler facility |
| JP2003121294A (en) * | 2001-10-16 | 2003-04-23 | Osaka Gas Co Ltd | Gas leaking position detection method and device |
| CN201034749Y (en) * | 2007-04-09 | 2008-03-12 | 中国水利水电科学研究院 | Geothermometry system for detecting dam leakage circulation path |
| CN101339087A (en) * | 2008-08-26 | 2009-01-07 | 江苏华东建设基础工程有限公司 | Rapid detector system for water stopping curtain seepage channel and detection method |
| CN101639540A (en) * | 2009-06-25 | 2010-02-03 | 江苏华东地质建设集团有限公司 | Method for detecting seepage passage hidden trouble of waterproof curtain |
Non-Patent Citations (1)
| Title |
|---|
| 韩贵雷等: "中关铁矿深孔注浆幕墙井间电阻率测试技术和效果评价", 《地质调查与研究》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103835321A (en) * | 2014-03-14 | 2014-06-04 | 洛阳理工学院 | Simple device for horizontal displacement monitoring |
| CN103835321B (en) * | 2014-03-14 | 2015-09-02 | 洛阳理工学院 | A kind of easy device for horizontal displacement monitoring |
| CN105239609A (en) * | 2015-10-16 | 2016-01-13 | 上海岩土工程勘察设计研究院有限公司 | Underground continuous wall leakage detection method |
| CN105297753A (en) * | 2015-10-16 | 2016-02-03 | 上海交通大学 | Determining method of hydrogeololgy parameters under the action of waterproof curtains |
| CN105239609B (en) * | 2015-10-16 | 2017-05-03 | 上海岩土工程勘察设计研究院有限公司 | Underground continuous wall leakage detection method |
| CN105604066A (en) * | 2015-12-25 | 2016-05-25 | 天津市勘察院 | Application of resistivity profiling method to detection of building foundation pit support structure water leakage |
| CN110006595A (en) * | 2019-03-20 | 2019-07-12 | 中铁四局集团有限公司 | A kind of Retaining Structure of Extra-deep Excavation plane leakage detection method |
| CN110763400A (en) * | 2019-09-16 | 2020-02-07 | 光大环保(盐城)固废处置有限公司 | Method and system for detecting defects of vertical impervious curtain |
| CN110763400B (en) * | 2019-09-16 | 2021-08-27 | 光大环保(盐城)固废处置有限公司 | Method and system for detecting defects of vertical impervious curtain |
| 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 |
| CN113027521A (en) * | 2021-02-03 | 2021-06-25 | 淮北矿业股份有限公司 | Method for evaluating whole-area dredging effect after closure of curtain |
| CN113027521B (en) * | 2021-02-03 | 2023-12-22 | 淮北矿业股份有限公司 | Method for evaluating full-area thinning effect after curtain interception |
| CN115288215A (en) * | 2022-08-23 | 2022-11-04 | 北京地矿工程建设有限责任公司 | Method for predicting water leakage of leakage point of waterproof curtain |
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Application publication date: 20120328 |