CN102691286B - Method and device for monitoring seepage of underground diaphragm wall of foundation ditch of building - Google Patents
Method and device for monitoring seepage of underground diaphragm wall of foundation ditch of building Download PDFInfo
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- CN102691286B CN102691286B CN201210202846.4A CN201210202846A CN102691286B CN 102691286 B CN102691286 B CN 102691286B CN 201210202846 A CN201210202846 A CN 201210202846A CN 102691286 B CN102691286 B CN 102691286B
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Abstract
The invention relates to a method and device for monitoring the seepage of an underground diaphragm wall of a foundation ditch of a building. The method comprises the following steps of: (1) constructing a borehole at the center of the foundation ditch, arranging a power supply electrode A at the bottom of the borehole, and arranging another power supply electrode B at a place 7-10 times of the length of the foundation ditch away from the center of the foundation ditch; (2) arranging detection points on the ground surface along the underground diaphragm wall in a manner of surrounding the foundation ditch, and arranging a measuring electrode M and a measuring electrode N at each detection point along the direction vertical to the underground diaphragm wall; (3) marking out planar positions with abnormal delta VMN; (4) marking out vertical elevations with the abnormal delta VMN; and (5) obtaining positions corresponding to the planar positions with the abnormal delta VMN obtained in the step (3) and the vertical elevations with the abnormal delta VMN obtained in the step (4), thereby obtaining positions in seepage. The invention further relates to a device for monitoring the seepage of the underground diaphragm wall of the foundation ditch of the building. By using the method and device for monitoring the underground diaphragm wall of the foundation ditch of the building, the damage to an underground diaphragm wall body can be avoided, and the operation is very simple and convenient.
Description
Technical field
The present invention relates to a kind of method and device of monitoring building foundation pit diaphragm wall seepage.
Background technology
Highrise building, subway, bridge, tunnel etc., usually adopt deep foundation, excavate very dark foundation ditch.In order to ensure foundation ditch normal construction, prevent the harm such as the building of periphery are subject to the uneven sedimentation of influence of foundation excavation, displacement is even collapsed, often along the design of foundation ditch surrounding, construction soldier pile and diaphragm wall, with the lateral pressure of supporting from periphery, cut off the hydraulic connection of foundation ditch and periphery.Diaphragm wall is a kind of concealed work, and the pouring of its concrete bodies is often because subsurface picture is complicated or uncertain problem occurs and there is hidden danger of quality, and mainly the deficient closely knit intensity that causes in concrete local reduces or occurs seepage.First monitor, find out the quality problems of concealed work before excavation of foundation pit, for guaranteeing that the safety excavating rear foundation ditch itself and periphery building is most important.
In building foundation field, the method that building foundation pit construction of diaphragm wall quality surveyed by existing prison (inspection) has two kinds: one is drilled drawing-core method, and another kind is sound wave transmission method.Drilled drawing-core method needs hole on diaphragm wall body and extract concrete core, carries out mechanical test determine its intensity to concrete core.Acoustic wave transmission rule needs pre-buried sound detecting pipe before concrete casting, after concrete casting, inserts acoustic energy transmitter and receiver respectively, judge concrete compactness according to the acoustic velocity recorded and amplitude at two (or multiple) sound detecting pipes.These two kinds of methods all have certain destruction to diaphragm wall body, and all can only sample testing by a certain percentage, can not loose core or pipe laying everywhere.
Summary of the invention
Technical problem to be solved by this invention is, provides a kind of method and device of the monitoring building foundation pit diaphragm wall seepage avoiding that diaphragm wall body is damaged.
The technical scheme that the present invention solves the employing of its technical problem is:
The method of the monitoring building foundation pit diaphragm wall seepage of the present invention, comprises the following steps:
(1) after construction of diaphragm wall, before excavation of foundation pit, construct at foundation ditch center one and hole, severity control preferred 0.4-0.6m of above 0.3-0.7m(at the bottom of foundation ditch of boring), an electrodes of A is laid at foot of hole, lay another current electrode B in the place of 7 ~ 10 times of foundation ditch length in distance foundation ditch center, water pump is transferred to the position of 0.4-0.6m above electrodes of A in boring, and water pump is connected with the mains;
(2) test point is arranged along diaphragm wall around foundation ditch on ground, distance between test point is 0.3-0.7m (preferred 0.4-0.6m), measurement electrode M and measurement electrode N is laid along the direction of vertical diaphragm wall at each test point, distance (be called and measure pole span) between measurement electrode M and measurement electrode N is 2 ~ 5m, by wire, the output of Electrical Measuring Instrument transmitter is connected on electrodes of A and current electrode B, by wire, measurement electrode M and measurement electrode N is connected to the input of Electrical Measuring Instrument receiver;
(3) first pumping for water pump is started, then Electrical Measuring Instrument transmitter is started, Electrical Measuring Instrument transmitter is powered respectively to ground around drill hole wall and foundation ditch by electrodes of A, current electrode B, restarts Electrical Measuring Instrument receiver, obtains the potential difference of measurement electrode M and measurement electrode N
; Such measurement is continued until all test point completes, according to the potential difference that Electrical Measuring Instrument receiver records along each test point around foundation ditch
, mark
unusual plan-position;
(4) regulate the power of water pump to observe the situation of boring water level in borehole reduction, water level often reduces the preferred 1-3m of 0.5-4.0 m(simultaneously), repeat step (3) described measuring process, according to the potential difference that Electrical Measuring Instrument receiver records
, mark
unusual vertical distribution;
(5) step (3) gained
unusual plan-position and step (4) gained
the unusual position corresponding to vertical distribution, is leak location.
The device of the monitoring building foundation pit diaphragm wall seepage of the present invention, comprise water pump and Electrical Measuring Instrument, described Electrical Measuring Instrument comprises Electrical Measuring Instrument transmitter, Electrical Measuring Instrument receiver, electrodes of A, current electrode B, measurement electrode M and measurement electrode N, the output of described Electrical Measuring Instrument transmitter is connected with electrodes of A, current electrode B respectively, and the input of described Electrical Measuring Instrument receiver is connected with measurement electrode M, measurement electrode N respectively.
The dike piping leaking equipment that the preferred Jishan High Tech Co., Ltd., Hunan Prov. of described Electrical Measuring Instrument produces.
The method of the monitoring building foundation pit diaphragm wall seepage of the present invention, according to Ohm's law in electricity,
,
, wherein
the electric-field intensity between measurement electrode M and measurement electrode N,
the distance between measurement electrode M and measurement electrode N,
the resistivity of ground between measurement electrode M and measurement electrode N,
be the current density flowing through ground between measurement electrode M and measurement electrode N, if diaphragm wall exists seepage, inherently cause near seepage
with
change, thus to cause
change.According to
the position changed and change size, i.e. the degree of the position that deducibility seepage occurs and seepage, thus the remedial measure proposing water seepage prevention.
The method of the monitoring building foundation pit diaphragm wall seepage of the present invention, not only can infer the plan-position at seepage place, the vertical distribution that seepage occurs can also be inferred, after water pump starts to draw water, along with groundwater table declines, a cone of depression can be formed around boring.When water level not yet drops to leak location, the shape that cone of depression is substantially symmetrical; When water level decreasing is to during near diaphragm wall leakage, have seepage side cone of depression and leakproof side cone of depression asymmetric, the potential difference of electrical measurement acquisition is also different.
Compare with sound wave transmission method with existing drilled drawing-core method, the detection method that the present invention adopts electrical measurement to combine with pumping test, do not need to hole on diaphragm wall, also do not need pre-buried sound detecting pipe, do not destroy the continuity of body of wall itself; Meanwhile, drilled drawing-core can be saved and carry out the steps such as mechanical test again, or save pre-buried sound detecting pipe and carry out the steps such as acoustic wave transmission again.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device of the monitoring building foundation pit diaphragm wall seepage of the embodiment of the present invention;
When Fig. 2 is pumping for water pump, water level not yet drops to the cone of depression schematic shapes of leak location;
When Fig. 3 is pumping for water pump, water level decreasing is to the cone of depression schematic shapes of leak location.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
With reference to accompanying drawing, the method for the monitoring building foundation pit diaphragm wall seepage of the present embodiment, comprises the following steps:
(1) after construction of diaphragm wall, before excavation of foundation pit, construct at foundation ditch center one and hole 1, severity control above 0.5m at the bottom of foundation ditch of boring 1, an electrodes of A 3-1 is laid in the bottom of boring 1, lay another current electrode B3-2 in the place of the 8 times of foundation ditch length in distance foundation ditch center, water pump 2 is transferred to the position of the above 0.5m of electrodes of A 3-1 bottom boring 1, and water pump 2 is connected with the mains;
(2) test point is arranged along diaphragm wall around foundation ditch on ground, distance between test point is 0.5m, measurement electrode M and measurement electrode N is laid along the direction of vertical diaphragm wall at each test point, distance between measurement electrode M and measurement electrode N is 3m, by wire, the output of Electrical Measuring Instrument transmitter 4 is connected on electrodes of A 3-1 and current electrode B3-2, by wire, measurement electrode M and measurement electrode N is connected to the input of Electrical Measuring Instrument receiver 5;
(3) first start water pump 2 to draw water, then Electrical Measuring Instrument transmitter 4 is started, Electrical Measuring Instrument transmitter 4 is powered respectively to ground around drill hole wall and foundation ditch by electrodes of A 3-1, current electrode B3-2, restarts Electrical Measuring Instrument receiver 5, obtains the potential difference between measurement electrode M and measurement electrode N
; Such measurement is continued until all test point completes, according to the potential difference that Electrical Measuring Instrument receiver 5 records along each test point around foundation ditch
, mark
unusual plan-position;
(4) regulate the power of water pump to observe the situation of boring water level in borehole reduction, water level often reduces by 2 m simultaneously, repeats step (3) described measuring process, according to the potential difference that Electrical Measuring Instrument receiver 5 records
, mark
unusual vertical distribution;
(5) step (3) gained
unusual plan-position and step (4) gained
the unusual position corresponding to vertical distribution, is leak location 10.
The device of the monitoring building foundation pit diaphragm wall seepage of the present embodiment, comprise water pump 2 and Electrical Measuring Instrument, described Electrical Measuring Instrument comprises Electrical Measuring Instrument transmitter 4, Electrical Measuring Instrument receiver 5, electrodes of A 3-1, current electrode B3-2, measurement electrode M and measurement electrode N, the output of described Electrical Measuring Instrument transmitter 4 is connected with electrodes of A 3-1, current electrode B3-2 respectively, and the input of described Electrical Measuring Instrument receiver 5 is connected with measurement electrode M, measurement electrode N respectively.
The levee piping and seepage detector that described Electrical Measuring Instrument selects Jishan High Tech Co., Ltd., Hunan Prov. to produce.
According to the Ohm's law in electricity,
,
, wherein
the electric-field intensity between measurement electrode M and measurement electrode N,
the distance between measurement electrode M and measurement electrode N,
the resistivity of ground between measurement electrode M and measurement electrode N,
be the current density flowing through ground between measurement electrode M and measurement electrode N, if diaphragm wall exists seepage, inherently cause near seepage
with
change, thus to cause
change.According to
the position changed and change size, i.e. the degree of the position that deducibility seepage occurs and seepage, thus the remedial measure proposing water seepage prevention.
The method of the monitoring building foundation pit diaphragm wall seepage of the present invention, not only can infer the plan-position at seepage place, the vertical distribution that seepage occurs can also be inferred, after water pump starts to draw water, along with groundwater table declines, a cone of depression can be formed around boring.When water level not yet drops to leak location, the shape (see Fig. 2) that cone of depression is substantially symmetrical; When water level decreasing is to during near diaphragm wall leakage, have seepage side cone of depression and leakproof side cone of depression asymmetric (see Fig. 3), the potential difference that electrical measurement obtains is also different.
Claims (5)
1. monitor a method for building foundation pit diaphragm wall seepage, it is characterized in that, comprise the following steps:
(1) after construction of diaphragm wall, before excavation of foundation pit, construct at foundation ditch center one and hole, severity control above 0.3-0.7m at the bottom of foundation ditch of boring, an electrodes of A is laid at foot of hole, lay another current electrode B in the place of 7 ~ 10 times of foundation ditch length in distance foundation ditch center, water pump is transferred to the position of 0.4-0.6m above electrodes of A in boring, and water pump is connected with the mains;
(2) test point is arranged along diaphragm wall around foundation ditch on ground, distance between test point is 0.3-0.7m, measurement electrode M and measurement electrode N is laid along the direction of vertical diaphragm wall at each test point, distance between measurement electrode M and measurement electrode N is 2-5m, by wire, the output of Electrical Measuring Instrument transmitter is connected on electrodes of A and current electrode B, by wire, measurement electrode M and measurement electrode N is connected to the input of Electrical Measuring Instrument receiver;
(3) first pumping for water pump is started, then Electrical Measuring Instrument transmitter is started, Electrical Measuring Instrument transmitter is powered respectively to ground around drill hole wall and foundation ditch by electrodes of A, current electrode B, restarts Electrical Measuring Instrument receiver, obtains the potential difference of measurement electrode M and measurement electrode N
; Such measurement is continued until all test point completes, according to the potential difference that Electrical Measuring Instrument receiver records along each test point around foundation ditch
, mark
unusual plan-position;
(4) regulate the power of water pump to observe the situation of boring water level in borehole reduction, water level often reduces 0.5-4.0 m simultaneously, repeats step (3) described measuring process, according to the potential difference that Electrical Measuring Instrument receiver records
, mark
unusual vertical distribution;
(5) step (3) gained
unusual plan-position and step (4) gained
the unusual position corresponding to vertical distribution, is leak location.
2. the method for monitoring building foundation pit diaphragm wall seepage according to claim 1, is characterized in that, in step (1), and severity control above 0.4-0.6m at the bottom of foundation ditch of described boring.
3. the method for monitoring building foundation pit diaphragm wall seepage according to claim 1 and 2, is characterized in that, in step (2), the distance between described test point is 0.4-0.6m.
4. the method for monitoring building foundation pit diaphragm wall seepage according to claim 1 and 2, is characterized in that, in step (4), the degree of depth that water level reduces at every turn is 1-3m.
5. the method for monitoring building foundation pit diaphragm wall seepage according to claim 3, is characterized in that, in step (4), the degree of depth that water level reduces at every turn is 1-3m.
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| CN201210202846.4A CN102691286B (en) | 2012-06-19 | 2012-06-19 | Method and device for monitoring seepage of underground diaphragm wall of foundation ditch of building |
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| CN201210202846.4A CN102691286B (en) | 2012-06-19 | 2012-06-19 | Method and device for monitoring seepage of underground diaphragm wall of foundation ditch of building |
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| CN102691286B true CN102691286B (en) | 2015-07-08 |
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| CN103015467B (en) * | 2012-12-25 | 2015-09-09 | 上海交通大学 | A kind of current potential Imaging Method detecting high polymer cutoff wall integrality |
| 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 |
| CN105604066B (en) * | 2015-12-25 | 2017-11-03 | 天津市勘察院 | Application of the resistivity profiling in the detection of building foundation pit building enclosure percolating water |
| 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 |
| CN106088174B (en) * | 2016-08-21 | 2018-07-17 | 浙江科技学院 | A kind of soft clay area diaphram wall seepage detection system |
| CN106320393B (en) * | 2016-08-21 | 2018-08-28 | 浙江科技学院 | A kind of soft clay area diaphram wall leakage detection method |
| CN107816639A (en) * | 2017-11-17 | 2018-03-20 | 段清明 | Underground water seepage detection system and detection method based on electrochemistry |
| CN108844684A (en) * | 2018-04-17 | 2018-11-20 | 中国矿业大学 | A method of monitoring diaphram wall seam crossing leakage scenarios |
| CN108922368B (en) * | 2018-06-18 | 2023-12-01 | 苏州大学 | Underground diaphragm wall grooving whole process test method and simulation device thereof |
| CN110187398B (en) * | 2019-07-11 | 2020-12-15 | 中南大学 | Multi-electrode system detection method for searching target body between wells |
| CN110888171A (en) * | 2019-12-14 | 2020-03-17 | 上海勘察设计研究院(集团)有限公司 | Foundation pit support structure leakage hidden danger detection method based on current field method |
| CN114063173A (en) * | 2021-09-30 | 2022-02-18 | 中国建筑股份有限公司 | Building roof leakage detection system and method |
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