CN108867716A - A kind of connection test method of drawing water of lowering heartn type water-stop curtain - Google Patents
A kind of connection test method of drawing water of lowering heartn type water-stop curtain Download PDFInfo
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- CN108867716A CN108867716A CN201810603758.2A CN201810603758A CN108867716A CN 108867716 A CN108867716 A CN 108867716A CN 201810603758 A CN201810603758 A CN 201810603758A CN 108867716 A CN108867716 A CN 108867716A
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/10—Restraining of underground water by lowering level of ground water
Abstract
The present invention provides a kind of connection test methods of drawing water of lowering heartn type water-stop curtain, by lowering heartn type water-stop curtain, foundation pit and multiple pilot wellgroups realization on foundation pit boundary, wherein several mouthful observation well constructions of each pilot wellgroup by the pumped well in a bite foundation pit and respectively in foundation pit and outside foundation pit.Draw water connection test at progress test method early period scene, is monitored to inside and outside water level variation is cheated, collects test data；Later stage by pair and foundation pit inside and outside test well water level variation analysis, it can be with effective evaluation lowering heartn type water-stop curtain every infiltration effect, it predicts the influence settled after base pit dewatering to surrounding ground, provides strong foundation for later period precipitation optimization design, provide safety guarantee for excavation.
Description
Technical field
The present invention relates to foundation pit dewatering project fields, and in particular to a kind of connection test side of drawing water of lowering heartn type water-stop curtain
Method.
Background technique
With the continuous development of base pit engineering, foundation pit surrounding environment Deformation control is required more stringent in addition, in recent years, state
The interior method for carrying out precipitation using ultra-deep lowering heartn type water-stop curtain cooperation deep well points is widely applied in deep-foundation pit engineering.It is bottomed
The setting of formula water-stop curtain, artificial increases water proof boundary, change the boundary condition of former seepage field, and water-stop curtain is applied
Working medium amount and bottomed water barrier every factors such as the difficulty to control for seeping effect so that Analysis of Ground-water Seepage Field becomes increasingly complex.
Theoretically it is generally believed that the foundation pit under the conditions of lowering heartn type water-stop curtain be it is completely enclosed, foundation pit is inside and outside without waterpower
Connection.But in fact, due to being limited by engineering technology and geological conditions, i.e. water-stop curtain often existing defects, and bottom
Relative water resisting layer (such as basement rock) is also likely to be present certain crack, therefore the foundation pit under the conditions of lowering heartn type water-stop curtain is not
Completely cut off with underground water outside foundation pit.If water-stop curtain is due to construction etc., there is defects, without finding and remedying in time
When, it is excessive that base pit dewatering causes to cheat outer drawdown, and it is excessive to will cause surrounding ground settling amount, generates adverse effect to surrounding enviroment；
In addition, inside and outside foundation pit under the action of biggish head difference, underground water will pass through water-stop curtain side wall defect after precipitation starts
Silt is carried under one's arms by pouring in hole outside cheating by place, and formation gushes leakage phenomenon to what engineering safety and construction speed caused greatly to adversely affect.
It can be seen that foundation pit dewatering project under the conditions of lowering heartn type water-stop curtain, needs set of system, processing method rationally, economic, goes
The drawdown of artesian head inside and outside foundation pit is found out to differentiate the construction quality of water-stop curtain and seam crossing, to ensure Foundation Pit Construction
Process it is safe and reliable.
Summary of the invention
In order to solve the above-mentioned problems in the prior art, the present invention provides a kind of drawing water for lowering heartn type water-stop curtain
Connection test method.Draw water connection test at progress test method early period scene, supervises to inside and outside water level variation is cheated
It surveys, collects test data；Later stage by pair and foundation pit inside and outside test well water level variation analysis, can be with effective evaluation
The influence after infiltration effect, prediction base pit dewatering to surrounding ground sedimentation of lowering heartn type water-stop curtain, sets for the optimization of later period precipitation
Meter provides strong foundation, provides safety guarantee for excavation.
The connection test method of drawing water of a kind of lowering heartn type water-stop curtain of the invention, by the lowering heartn type sealing on foundation pit boundary
Curtain, foundation pit and multiple pilot wellgroups are realized, wherein each pilot wellgroup is by the pumped well in a bite foundation pit and respectively in base
Several mouthfuls of observation well constructions in hole and outside foundation pit, which is characterized in that comprise the steps of：
S0, test well design：Obtain the well head number of the group number of test well, the position of test well and test well；
Prepare before S1, test：Pumped well each in foundation pit is set up into drainage pipeline, drainage pipeline connects suction pump, draws water
There is the table that draws water of measurement pump-out, each pumped well and inspection well are equipped with a limnimeter and carry out water level monitoring on pump；
S2, bailing test：Obtain the measured value of the initial hydrostatic level of each pumped well and inspection well；Suction pump is taken out
Water obtains each pumped well and starts time of pumping and the table initial reading that draws water；At interval of 3 minutes pumped wells of acquisition and sight
The waterlevel data of well logging, until obtained every 20 minutes and once draw water after pumped well and observation Well Water Level numerical value no longer change
Well and inspection well waterlevel data stop pumping after 2 hours that pumped well and observation Well Water Level no longer change, and acquisition stops
Only time of pumping and at the end of pumped well in draw water the reading of table, to obtain the pump-out of each pumped well；
S3, water level restore test：The waterlevel data of a pumped well and inspection well, and test constantly were obtained every 20 minutes
2 hours；
S4, it is numbered, is drawn according to the waterlevel data and well head of the step S2 and step S3 each pumped well obtained and inspection well
Make S-T drawdown curve graph of each pumped well and inspection well.
Preferably, it in a kind of connection test method of drawing water of lowering heartn type water-stop curtain of the invention, is obtained by S4
S-T drawdown curve map analysis bailing test and water level restore the water level variation of each pumped well and inspection well when test, from
And obtain the sealing anti-seepage effect of lowering heartn type water-stop curtain.
Preferably, in a kind of connection test method of drawing water of lowering heartn type water-stop curtain of the invention, the pilot wellgroup
Number determines that total amount is no less than 4 groups according to the shape of foundation pit, excavation area and cutting depth.
Preferably, in a kind of connection test method of drawing water of lowering heartn type water-stop curtain of the invention, pilot wellgroup is arranged
Position when, the seam points of several place's lowering heartn type water-stop curtains or the corner point of excavation slope are selected, respectively with the point of selection
For the center of circle, each group pilot wellgroup is arranged one by one within the scope of the circle in radius 10m.
Preferably, in a kind of connection test method of drawing water of lowering heartn type water-stop curtain of the invention, the water level monitoring period
Divide three phases：Initial pumping phase, water level not changes phase and water level Restoration stage；In entire monitoring cycle, to pumped well
It is monitored with observation Well Water Level, initial pumping phase will be maintained at water level monitoring time interval 3 minutes；Do not change in water level
After stage, monitoring time interval holding was at 20 minutes.
Preferably, in a kind of connection test method of drawing water of lowering heartn type water-stop curtain of the invention, waterlevel data measurement
Method is：It is put under the probe of limnimeter is hung with piano wire in test well well casing, until limnimeter probe contacts to water
When plane, limnimeter indicator light president is bright or can continue buzzing, records the numerical value on piano wire at this time, quiet for test well at this time
Water level.
Beneficial effects of the present invention are：
(1) it after the construction of lowering heartn type water-stop curtain, is drawn water connection test, is found out by the multiple groups underground water of different direction
The drawdown of inside and outside artesian head is cheated to differentiate the construction quality of water sealing structure and seam crossing, is being imitated every infiltration for lowering heartn type water-stop curtain
Fruit evaluation provides foundation.
(2) influence settled after base pit dewatering to surrounding ground is predicted.
(3) connection test that draws water can seek more accurate hydrogeological parameter, provide for later period precipitation optimization design
Strong foundation provides safety guarantee for excavation.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples, in attached drawing：
Fig. 1 is flow chart of the embodiment of the present invention；
Fig. 2 is that the present invention draws water connection test test well plan view；
Fig. 3 is test well S-T drawdown curve synoptic diagram of the present invention；
Fig. 4 is case history of embodiment of the present invention test well plan view；
Fig. 5 is that the embodiment of the present invention is drawn water first group of test well S-T curve figure of connection test.
Specific embodiment
In order to which the technical features, objects and effects of invention are more clearly understood, now compare attached drawing and this is described in detail
The specific embodiment of invention.
Now in conjunction with certain foundation pit dewatering project example, technical effect evaluation is carried out to the present invention.
The connection test method of drawing water of a kind of lowering heartn type water-stop curtain of the invention, with reference to Fig. 2, by 1 boundary of foundation pit
Lowering heartn type water-stop curtain 2 and multiple pilot wellgroup 3-8 realize that wherein pilot wellgroup 3 is by the pumped well 31 and one in a bite foundation pit
Inspection well 32 outside mouth foundation pit forms, and pilot wellgroup 4 to pilot wellgroup 8 is comprising a bite pumped well in foundation pit and in foundation pit
With the inspection well outside foundation pit, the method for the present invention is comprised the steps of with reference to Fig. 1：
S0, test well design：Obtain the well head number of the group number of test well, the position of test well and test well；
Prepare before S1, test：Pumped well each in foundation pit is set up into drainage pipeline, drainage pipeline connects suction pump, draws water
There is the table that draws water of measurement pump-out, each pumped well and inspection well are equipped with a limnimeter and carry out water level monitoring on pump；
S2, bailing test：Obtain the measured value of the initial hydrostatic level of each pumped well and inspection well；Suction pump is taken out
Water obtains each pumped well and starts time of pumping and the table initial reading that draws water；At interval of 3 minutes pumped wells of acquisition and sight
The waterlevel data of well logging, until obtained every 20 minutes and once draw water after pumped well and observation Well Water Level numerical value no longer change
Well and inspection well waterlevel data stop pumping after 2 hours that pumped well and observation Well Water Level no longer change, and acquisition stops
Only time of pumping and at the end of pumped well in draw water the reading of table, to obtain the pump-out of each pumped well；
S3, water level restore test：The waterlevel data of a pumped well and inspection well, and test constantly were obtained every 20 minutes
2 hours；
S4, it is numbered, is drawn according to the waterlevel data and well head of the step S2 and step S3 each pumped well obtained and inspection well
S-T drawdown the curve graph for making each pumped well and inspection well, with reference to Fig. 3.
In a kind of connection test method of drawing water of lowering heartn type water-stop curtain of the invention, S-T for being obtained by step S4
Drawdown curve map analysis bailing test and water level restore the water level variation of each pumped well and inspection well when test, to obtain
Obtain the sealing anti-seepage effect of lowering heartn type water-stop curtain.The pilot wellgroup number is according to the shape of foundation pit, excavation area and excavates deep
For degree to determine, total amount is no less than 4 groups.When arranging the position of pilot wellgroup, the seam points of several place's lowering heartn type water-stop curtains are selected
Or the corner point of excavation slope, arranging each group examination one by one using the point selected as the center of circle, within the scope of the circle in radius 10m respectively
Test well group.
Wherein, the water level monitoring period divides three phases：Changes phase and water level do not restore rank for initial pumping phase, water level
Section；In entire monitoring cycle, pumped well and observation Well Water Level are monitored, initial pumping phase is to water level monitoring time interval
It is maintained at 3 minutes；After water level not changes phase, monitoring time interval holding was at 20 minutes.Waterlevel data measurement method is：
It is put under the probe of limnimeter is hung with piano wire in test well well casing, until limnimeter probe contacts are to water level face,
Limnimeter indicator light president is bright or can continue buzzing, records the numerical value on piano wire at this time, for test well hydrostatic level at this time.Under
Face is further described the method for the present invention with specific embodiment.
Certain main preservation in deep basal pit place has two seed type underground water, i.e. perched water and artesian water.Top perched water
Water level buries shallowly, and lower part artesian water head is high.By to this engineering formation condition, underground water and excavation of foundation pit depth it is various
Factor analysis, this foundation pit carries out underground bearing water processing design using " drop is every combination " mode, i.e., periphery diaphram wall is complete
Portion enters basement rock, to cut off the artesian water connection inside and outside foundation pit, while deep-well precipitation pipe well is arranged in foundation pit and carries out decompression drop
Water, to ensure going on smoothly for excavation of foundation pit and basement construction.
Connection test draw water before entire proposed place excavation of foundation pit, periphery diaphram wall lowering heartn type water-stop curtain is completed
After carry out.This each pilot wellgroup of connection test that draws water by pumped well in 1 mouthful of foundation pit and 3 mouthfuls of foundation pits and foundation pit appearance log well
Composition.Since foundation pit partial sector is still carrying out the construction such as crown beam, pile foundation during test, outer main drainage system is cheated also in partial region
It does not complete and part well is since construction and excavation such as is destroyed at the conditions limitation, the connection test that draws water of the embodiment of the present invention includes altogether
5 pilot wellgroups, the position plane figure of pilot wellgroup are shown in attached drawing 4, comprising pilot wellgroup 1, pilot wellgroup 2, pilot wellgroup 3,
Pilot wellgroup 4 and pilot wellgroup 5.Pumped well and the inspection well number and specific grouping that each pilot wellgroup includes are as shown in table 1,
Table 1 draw water connection test test well grouping
During test, is first tested in East, successively carried out first group, second group of connection test that draws water.East
After the test, start the connection test that draws water of West, third group, the 4th group, the 5th group successively carry out.Every group of test draws water 8
Hour or so.
In entire monitoring cycle, test Well Water Level is monitored, initial pumping phase is to water level monitoring, due under water level
Reduction of speed rate is fast, and monitoring time interval holding basically reaches stabilization sub stage and water level Restoration stage at 3 minutes, in water level, when monitoring
Between interval holding at 20 minutes.
Now water level monitoring data are analyzed by taking battery of tests in 5 groups of connection tests that draw water as an example：
Battery of tests：It draws water and maintains 455min, restore observation 30min.Pumped well SJ10, hole appearance well logging CJ16 distance
Pumped well distance is 17m, and cheating interior inspection well SJ95, SJ96 apart from pumped well distance is respectively 45m, 29m.The drawdown of each test well
With shown in the following attached drawing 5 of time curve.
With reference to the accompanying drawings 5, during observation, pumped well SJ10 water level in 450min reaches drawdown 4.84m, from figure
In as can be seen that water level drawdown rate of change in 0min~5min is maximum, in 5min~450min drawdown it is slow on
It rises, basically reaches stabilization in 360min.
Inspection well in cheating, SJ95 is within the time of observation, and in 450min, water level reaches drawdown 1.57m, from figure
As can be seen that water level drawdown rate of change in 0min~90min is maximum, in 90min~450min drawdown it is slow on
It rises, basically reaches stabilization in 450min.SJ96 pumped well is within the time of observation, and in 450min, water level reaches maximum drop
Deep 2.33m, it can be seen from the figure that water level drawdown rate of change in 0min~120min is maximum, in 120min~450min
Interior drawdown slowly rises, and basically reaches stabilization in 360min.
Appearance well logging is cheated, CJ16 is in a localised waving, overall downward trend, but fluctuating range is smaller, maximum drop
Depth is 0.1m.Can it is stated that, periphery diaphram wall lowering heartn type water-stop curtain plays preferable impermeable role, diaphram wall
Lowering heartn type water-stop curtain construction quality meets design requirement.And cheat drawdown ground caused by 0.1m, the drawdown of appearance well logging
Face sedimentation can be ignored substantially, and foundation pit dewatering project causes deepening of ground water table and surface subsidence aspect to foundation pit peripheral ring
The influence in border is smaller.
Such as first group of other 4 groups of analysis of experiments processes, drawdown when basically reaching stable according to the connection test that draws water
And well location relationship, arrangement obtain as shown in table 2.
Table 2 draws water connection test test well drawdown achievement
Appearance well logging drawdown in hole is minimum in this test, and caused surface subsidence can be ignored substantially, but
It is that appearance well logging drawdown larger situation in hole is encountered in engineering, it can be according to Hubei Province《Foundation pit tube well dewatering engineering skill
Art regulation》5.6.6 formula shown in is calculated：
Every meaning is as follows in formula：
Ms--- empirical coefficient
σwi--- stress increment, unit Mpa
Δhi--- strata division thickness, unit cm
Esi--- layer compression modulus, unit Mpa
Δsw--- settling amount, unit cm
S --- total settlement, unit cm
The maximum hole appearance well logging of drawdown is chosen according to connection test result, corresponding ginseng is determined by exploration report and specification
Number carries out settlement calculation by above formula, obtains cheating outer settling amount and compared with code requirement settling amount, judges foundation pit drop with this
Water causes whether ground settlement meets code requirement.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific
Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art
Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much
Form, all of these belong to the protection of the present invention.
Claims (6)
1. the connection test method of drawing water of a kind of lowering heartn type water-stop curtain, by lowering heartn type water-stop curtain, the foundation pit on foundation pit boundary
And multiple pilot wellgroups are realized, wherein each pilot wellgroup is by the pumped well in a bite foundation pit and respectively in foundation pit and foundation pit
Several mouthfuls of outer observation well constructions, which is characterized in that comprise the steps of：
S0, test well design：Obtain the well head number of the group number of designed test well, the position of test well and test well；
Prepare before S1, test：Pumped well each in foundation pit is set up into drainage pipeline, drainage pipeline connects suction pump, on suction pump
The table that draws water with measurement pump-out, each pumped well and inspection well are equipped with a limnimeter and carry out water level monitoring；
S2, bailing test：Obtain the measured value of the initial hydrostatic level of each pumped well and inspection well；Suction pump draws water, and obtains
Each pumped well is taken to start time of pumping and the table initial reading that draws water；At interval of 3 minutes pumped wells of acquisition and inspection well
Waterlevel data, until after pumped well and observation Well Water Level numerical value no longer change, obtained every 20 minutes pumped well and
Inspection well waterlevel data stops pumping after 2 hours that pumped well and observation Well Water Level no longer change, obtains and stop taking out
The water time and at the end of pumped well in draw water the reading of table, to obtain the pump-out of each pumped well；
S3, water level restore test：The waterlevel data of a pumped well and inspection well, and test constantly 2 were obtained every 20 minutes
Hour；
S4, it is numbered, is drawn every according to the waterlevel data and well head of the step S2 and step S3 each pumped well obtained and inspection well
S-T drawdown curve graph of a pumped well and inspection well.
2. the connection test method of drawing water of a kind of lowering heartn type water-stop curtain according to claim 1, which is characterized in that pass through step
S-T drawdown curve map analysis bailing test and water level that rapid S4 is obtained restore the water level of each pumped well and inspection well when test
Changing rule, to obtain the sealing anti-seepage effect of lowering heartn type water-stop curtain.
3. the connection test method of drawing water of a kind of lowering heartn type water-stop curtain according to claim 1, which is characterized in that the examination
The quantity for testing well group determines that total amount is no less than 4 groups according to the shape of foundation pit, excavation area and cutting depth.
4. the connection test method of drawing water of a kind of lowering heartn type water-stop curtain according to claim 1, which is characterized in that arrangement examination
When testing the position of well group, the seam points of several place's lowering heartn type water-stop curtains or the corner point of excavation slope are selected, respectively with choosing
The point selected is the center of circle, arranges each group pilot wellgroup one by one within the scope of the circle in radius 10m.
5. the connection test method of drawing water of a kind of lowering heartn type water-stop curtain according to claim 1, which is characterized in that water level prison
It surveys the period and divides three phases：Initial pumping phase, water level not changes phase and water level Restoration stage；Initial pumping phase is to water level
It is divided between monitoring time 3 minutes；It is divided into after water level not changes phase, between monitoring time 20 minutes.
6. the connection test method of drawing water of a kind of lowering heartn type water-stop curtain according to claim 1, which is characterized in that water level number
It is according to measurement method：It is put under the probe of limnimeter is hung with piano wire in test well well casing, until limnimeter probe connects
When contacting water level face, limnimeter indicator light president is bright or can continue buzzing, records the numerical value on piano wire, at this time to try at this time
Test well hydrostatic level.
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| CN201810603758.2A CN108867716B (en) | 2018-06-12 | 2018-06-12 | Water pumping communication test method for bottom-falling type waterproof curtain |
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|---|---|---|---|
| CN201810603758.2A CN108867716B (en) | 2018-06-12 | 2018-06-12 | Water pumping communication test method for bottom-falling type waterproof curtain |
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| CN108867716B CN108867716B (en) | 2021-05-14 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110593859A (en) * | 2019-10-17 | 2019-12-20 | 中化地质矿山总局山东地质勘查院 | Method for testing layered water stop effect of underground water monitoring well |
| 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 |
| CN110988305A (en) * | 2019-12-18 | 2020-04-10 | 苟印祥 | Automatic water pumping test device and implementation method |
| CN111946333A (en) * | 2020-07-02 | 2020-11-17 | 临沂矿业集团菏泽煤电有限公司 | Simple test and solution method for aquifer hydrogeological parameters under curtain grouting condition |
| CN112985718A (en) * | 2021-02-05 | 2021-06-18 | 中建一局集团建设发展有限公司 | Waterproof curtain evaluation system and method based on high-density resistivity method |
| CN117266212A (en) * | 2023-11-23 | 2023-12-22 | 北京建工集团有限责任公司 | Low-cost dewatering method for foundation pit positioned in runoff-type interlayer water-containing stratum |
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2018
- 2018-06-12 CN CN201810603758.2A patent/CN108867716B/en active Active
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110593859A (en) * | 2019-10-17 | 2019-12-20 | 中化地质矿山总局山东地质勘查院 | Method for testing layered water stop effect of underground water monitoring well |
| CN110593859B (en) * | 2019-10-17 | 2023-07-28 | 中化地质矿山总局山东地质勘查院 | Method for checking layered water stopping effect of underground water monitoring well |
| CN110988305A (en) * | 2019-12-18 | 2020-04-10 | 苟印祥 | Automatic water pumping test device and implementation method |
| CN111946333A (en) * | 2020-07-02 | 2020-11-17 | 临沂矿业集团菏泽煤电有限公司 | Simple test and solution method for aquifer hydrogeological parameters under curtain grouting condition |
| CN111946333B (en) * | 2020-07-02 | 2021-05-18 | 临沂矿业集团菏泽煤电有限公司 | Simple test and solution method for aquifer hydrogeological parameters under curtain grouting condition |
| CN112985718A (en) * | 2021-02-05 | 2021-06-18 | 中建一局集团建设发展有限公司 | Waterproof curtain evaluation system and method based on high-density resistivity method |
| CN112985718B (en) * | 2021-02-05 | 2022-09-30 | 中建一局集团建设发展有限公司 | Waterproof curtain evaluation method based on high-density resistivity method |
| CN117266212A (en) * | 2023-11-23 | 2023-12-22 | 北京建工集团有限责任公司 | Low-cost dewatering method for foundation pit positioned in runoff-type interlayer water-containing stratum |
| CN117266212B (en) * | 2023-11-23 | 2024-02-09 | 北京建工集团有限责任公司 | Precipitation method for foundation pit located in runoff-type interlayer water-containing stratum |
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