CN104831762B - Deep basal pit artesian water precipitation dynamic monitoring system and monitoring method - Google Patents
Deep basal pit artesian water precipitation dynamic monitoring system and monitoring method Download PDFInfo
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Abstract
The invention discloses deep basal pit artesian water precipitation dynamic monitoring system and monitoring method，Including monitoring well，Feature is to be provided with downcast well pipe in monitoring well，The bottom of downcast well pipe is provided with chimney filter in artesian aquifer region to be measured，The bottom of chimney filter is provided with precipitation tube，The sealed bottom setting of precipitation tube，It is filled with sealing of hole clay between the top of downcast well pipe and the hole wall of monitoring well，It is filled with sealing clay between the bottom of downcast well pipe and the hole wall of monitoring well，Grittiness filtrate is filled between chimney filter and the hole wall of monitoring well and between precipitation tube and the hole wall of monitoring well，The inwall of downcast well pipe is longitudinally evenly equipped with several sensor for pore water pressures，Each sensor for pore water pressure connects data collecting instrument by wire respectively，Data collecting instrument connects monitoring computer，Chimney filter connects outside suction pump by drinking-water pipe，Advantage is dynamic、Accurately、The artesian water drawdown of reliable mensure，Can real-time judgment foundation ditch artesian water drawdown，Determine the pumped well out-of-work time.
Description
Technical field
The present invention relates to a kind of Ground Water Pumping during Excavation Dynamic Monitoring, especially relate to a kind of deep basal pit artesian water precipitation
Dynamic monitoring system and monitoring method.
Background technology
In recent years, to big depth, large area development, the problem of groundwater facing is also increasingly severe, especially for base pit engineering
It is that the artesian water of excavation of foundation pit face bottom can cause bottom heave, base plate to dash forward the problems such as gush to lead to instability of foundation pit, artesian water
Control is made for the key that can whole base pit engineering be smoothed out.The stable judgment basis of foundation ditch are that base plate of foundation pit is aqueous to pressure-bearing
Soil pressure between layer top board should be greater than the jacking force of artesian water, that is,：H·γs≥Fs·γwH, wherein H are foundation ditch bottom to pressure-bearing
Water-bearing layer top distance between plates (m), γsWeighted average weight (the kN/m of the soil between for foundation ditch bottom to artesian aquifer top board3), h is to hold
Pressure water head height, that is, static level to artesian aquifer top board distance (m), γwSevere (kN/m for water3), Fs is safety
Coefficient (takes 1.05).On the deep-foundation pit engineering being affected by artesian water, can be using water seal curtain cut-off, artesian water precipitation and back cover
It is a kind of relatively inexpensive effective measures that the methods such as reinforcing, wherein precipitation method control artesian head.
How good the applying of artesian water dewatering well and dewatering well, in deep basal pit artesian water dewatering project, is reasonably set
Work is successful key.However, because decompression of confined water precipitation will necessarily cause soil layer around foundation ditch to produce sedimentation, drawdown
Excessive necessarily cause surface subsidence excessive, water level precipitation is too small, does not reach decompression design effect, thus may still result in foundation ditch
Prominent gush, the generation of instability of foundation pit accident.In order to avoid similar accident occurs, accurately measurement artesian water drawdown, directly close
It is excavation of foundation pit safety.
Because excavation of foundation pit requires in time, accurately to water level prediction, so water level measuring frequency ratio is higher, traditional is artificial
It is very big that the mensuration subjective judgment by people of lining rope often results in waterlevel data deviation, there is very big potential safety hazard.At present on the market
Limnograph, probe is larger, and cost of equipment is very high, and it often tangles in well during dynamic water level in measuring dewatering well and draws water
Ring flange in inner tube, leads to instrument damage, and is necessary for re-replacing new equipment once damaging, so it is unfavorable for measuring
Water level in dewatering well.Therefore, it is suggested with regard to deep basal pit artesian water Rainfall Monitoring technology and method more in recent years, through to existing
Technology retrieval is had to find：Application No.【201220002120.1】's《Base pit dewatering well measurements water level device》Utility model patent
Propose a kind of base pit dewatering well measurements water level device, mainly include circuit tester, 2 electric wires, circuit tester probe, counterweights；Often
The two ends of root electric wire are respectively connected with circuit tester probe, and wherein the circuit tester probe of electric wire one end is for connecting with the water surface in well
Touch, the other end of circuit tester probe insertion of probe insertion circuit tester；Contacted 2 circuit testers of one end with the water surface in well
It is fixed in counterweight by insulative water-proof adhesive tape with probe.
Application No. 201410119862.6《A kind of base pit dewatering depth detection apparatus and detection method》Patent of invention
Propose precipitation depth detection means and detection method, this check device is made up of pore-forming pipe, detection pipe and scale bar.Pore-forming pipe
Top is cased with being embedded with the anti-of level indicator pounds plate, and side wall cloth has water seepage hole, and bottom is provided with solid conehead for sealed end, and detection pipe exists
Inside pore-forming pipe, bottom end closure, side wall is distributed with into water aperture, and every husky net, scale bar, in detection pipe, uses lightweight to its outer wrapping
Material is made, and top is provided with rule, and bottom is provided with light hollow ball.In detection pipe, scale bar rises under buoyancy,
Height of water level is read on the rule of scale bar and completes water level detecting.
Application No. 201420100363.8《Level of ground water surface relative elevation ordinary surveying in a kind of base pit dewatering well
Device》It is proposed that level of ground water surface relative elevation Simple measurement device in a kind of base pit dewatering well, it wraps utility model patent
Include the support of the multiple upper and lower parallel interval setting being fixed on the wall of dewatering well side by support bar, in the end of each support
One annulus is installed, the center of whole annulus is arranged concentrically, vertically hollow vertical rod vertically arranging passes through many
Individual annulus and slidably can arranging inside multiple annulus, is provided with ball float in the bottom of vertically hollow vertical rod, is being located at
The gauge being vertically arranged is provided with the support bar on well head top, gauge is oppositely arranged with vertically hollow vertical rod,
Relative elevation scale in the range of precipitation depth is provided with gauge, what pointer was vertical is fixed on the top of vertically hollow vertical rod
And be horizontally directed at gauge scale and in the range of gauge scale reading upper and lower limit.
Although the more traditional artificial lining rope of above-mentioned technology is mensuration certain improvement, substantially mensuration with artificial lining rope
Similar, mainly still manually reading forecasting the drawdown of artesian water.Additionally, either artificial lining rope or scale bar, hollow
Vertical rod, when drawdown is big, flexible deformation, thus affect to survey the precision reading data.
Content of the invention
The technical problem to be solved is to provide a kind of dynamic, accurately, reliably measure artesian water water level fall
Deep deep basal pit artesian water precipitation dynamic monitoring system and monitoring method, the method can real-time judgment foundation ditch artesian water drawdown,
Determine the pumped well out-of-work time, to guarantee the sedimentation that is stable and controlling foundation ditch periphery earth's surface of foundation ditch, reduce foundation ditch and apply
The impact to environment for the work.
The present invention solves the technical scheme that adopted of above-mentioned technical problem：
1st, a kind of deep basal pit artesian water precipitation dynamic monitoring system, including monitoring well, is provided with fall in described monitoring well
Well pipe, the bottom of described downcast well pipe is provided with chimney filter in artesian aquifer region to be measured, and the bottom of described chimney filter sets
It is equipped with the precipitation tube for precipitating sand, sealed bottom setting, the described top of downcast well pipe and the institute of described precipitation tube
Be filled with sealing of hole clay between the hole wall of the monitoring well stated, the hole wall of the described bottom of downcast well pipe and described monitoring well it
Between be filled with sealing clay, between the hole wall of described chimney filter and described monitoring well and described precipitation tube and described prison
Grittiness filtrate is filled, the inwall of described downcast well pipe is longitudinally evenly equipped with several sensor for pore water pressures between the hole wall of well logging,
Each described sensor for pore water pressure connects data collecting instrument by wire respectively, and described data collecting instrument connects monitoring computer,
Described chimney filter connects outside suction pump by drinking-water pipe.
Described chimney filter includes the steel reinforcement cage of a diameter of 200mm～300mm and is coated on described steel reinforcement cage periphery
Filter screen, the aperture of described filter screen is 1～2mm, and the particle diameter of described gravel filtrate is 3～15mm.
The aperture of described monitoring well is 550～600mm, a diameter of 300～450mm of described downcast well pipe；Described
The mouth of pipe of downcast well pipe be above the ground level 0.50-1m.To prevent surface waste water from penetrating in well.
Described sensor for pore water pressure be pore water pressure sensor, its a diameter of 1.5～12mm, range be 100kPa～
500kPa.
The infiltration coefficient of described sealing clay is 1.0 × 10-8Cm/s～1.0 × 10-10cm/s.
2nd, a kind of deep basal pit artesian water precipitation dynamic monitoring method, specifically includes following steps：
(1) artesian water precipitation dynamic monitoring system setting
Longitudinally equidistantly several sensor for pore water pressures are installed in the inwall of downcast well pipe, the bottom of downcast well pipe is connected successively
Connect chimney filter and precipitation tube, and precipitation bottom of the tube is shut；Using diving bore mud off open up monitoring well, in monitoring well by under
Divide into precipitation tube, chimney filter and downcast well pipe successively to upper, and precipitation tube and chimney filter are arranged in artesian aquifer region to be measured,
Gravel filtrate is backfilled, in the hole wall of monitoring well between the hole wall of monitoring well and precipitation tube and between the hole wall of monitoring well and chimney filter
Backfill sealing clay and downcast well pipe bottom between, between the hole wall of monitoring well and downcast well pipe top, backfill sealing of hole clay,
Each sensor for pore water pressure is wired on data collecting instrument, data collecting instrument is connected on monitoring computer, is formed
One complete artesian water precipitation dynamic monitoring system；
(2) Dynamic Data Acquiring analysis
Chimney filter will be extended in drinking-water pipe, opens pumping for water pump, and after stable level, time t is set to initial value 0,
Gather initial pore water pressure value P of each sensor for pore water pressureij0, convert and obtain corresponding sensor for pore water pressure in water level depth below,
And ID value H of sensor for pore water pressure is set to thisij0；Continue to draw water, water level decreasing, gather t, each sensor for pore water pressure
Pore water pressure force value Pijt, convert and obtain the depth value H of the corresponding sensor for pore water pressure of tijt；By t sensor for pore water pressure
Depth value HijtDeduct ID value H of sensor for pore water pressureij0, obtain the drawdown △ H of t sensor for pore water pressureijt, take t
Each sensor for pore water pressure drawdown be averagely worth to t drawdown Hit, draw and obtain drawdown HitAnd time t between
Curve relation figure be used for monitoring analysis；Pre-set target depth H, when reaching target depth H, system alarm prompting stopping is taken out
Water, returns to after certain altitude after water level, re-starts and draws water and monitor analysis, wherein i=1, and 2 ..., n number for well, j=1,
2 ..., n are the numbering of sensor for pore water pressure from top to bottom, and t is the time.
T in step (2), pore water pressure force value P of each sensor for pore water pressureijtConversion obtains corresponding sensor for pore water pressure
Water level depth value HijtComputational methods as follows：
…………
Hint=hint+hi(n-1)t+hi(n-2)t-hi1t=Pint/rw
Wherein hi1tFor the initial water level depth in i-th mouthful of well, hi2tFor the 1st sensor for pore water pressure of i-th mouthful of well in t
Elevation, j takes 3,4 ..., during n, hijtFor -1 sensor for pore water pressure of i-th mouthful of well jth and -2 sensor for pore water pressures of jth t away from
From, i=1,2 ..., n number for well, and j is the numbering of sensor for pore water pressure from top to bottom, and t is the time, γwSevere (kN/ for water
m3)；Described elevation is sensor for pore water pressure height from the ground；
As drawdown Hit>hi2t-hi1t, i.e. drawdown exceeded the depth of first sensor for pore water pressure, then first
Sensor for pore water pressure pore pressure value Pi1tIt is zero, then cancel Δ Hi1tMean value calculation；Work as Hit>hi3+hi2-hi1, cancel Δ Hi2tFlat
Mean value computation, the like.
Described chimney filter includes the steel reinforcement cage of a diameter of 200mm～300mm and is coated on described steel reinforcement cage periphery
Filter screen, the aperture of described filter screen is 1～2mm, and the particle diameter of described gravel filtrate is 3～15mm.
The aperture of described monitoring well is 550～600mm, a diameter of 300～450mm of described downcast well pipe；Described
The mouth of pipe of downcast well pipe be above the ground level 0.50-1m.
Described sensor for pore water pressure be pore water pressure sensor, its a diameter of 1.5～12mm, range be 100kPa～
500kPa.
Compared with prior art, it is an advantage of the current invention that：A kind of present invention deep basal pit artesian water precipitation dynamic monitoring system
System and monitoring method, during by well casing sinking, in desired depth, pressure transducer are arranged on well casing inwall, and by each sensing
Device wire is connected to data collecting instrument and computer, forms a complete artesian water drawdown dynamic monitoring system, by one
Serial sensor for pore water pressure measures the pore water pressure of each depth, and then conversion Calculation obtains depth below level of ground water for each measuring point
Degree, after precipitation starts, each measuring point pore water pressure changes, and is gradually reduced, and data collecting instrument obtains each sensor automatically
Pore water pressure reading, obtains the pore water pressure force value of any time, and sends it to the dynamic monitoring system of computer and carry out
Convert and obtain each measuring point water level depth changes delta H (drawdown), and take the meansigma methodss of all measuring point Δ H, thus when obtaining this
The drawdown H carving, and draw drawdown time-histories H～t curve.In monitoring system, can target setting drawdown, drawdown
Reach target drawdown, the prompting termination of system automatic alarm is drawn water.Test result of the present invention is accurately reliable, applied widely, technique
Simply, easy to operate, workload and the error of artificial reading can be reduced, energy is real-time, dynamically monitor drawdown, is deep basal pit
Artesian water precipitation draw water Construction control provide reliable foundation.
Brief description
Fig. 1 is the structural representation of deep basal pit artesian water precipitation dynamic monitoring system；
Fig. 2 is the H that specific embodiment three is drawn1tThe drawdown time history of～t；
1- precipitation pipe well, 2- sealing of hole clay, 3- sensor for pore water pressure, 4- sealing clay, 5- gravel filtrate, 6- chimney filter, 7- sink
Form sediment pipe, 8- data collecting instrument, 9- monitoring computer, 10- monitoring well, 11- artesian aquifer to be measured, 12- drinking-water pipe.
Specific embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Embodiment one
A kind of deep basal pit artesian water precipitation dynamic monitoring system, as shown in figure 1, including monitoring well 10, sets in monitoring well 10
It is equipped with downcast well pipe 1, the bottom of downcast well pipe 1 is provided with chimney filter 6 in artesian aquifer 11 region to be measured, and the bottom of chimney filter 6 sets
It is equipped with the precipitation tube 7 for precipitating sand, the sealed bottom setting of precipitation tube 7, the hole of the top of downcast well pipe 1 and monitoring well 10
It is filled with sealing of hole clay 2 between wall, between the hole wall of the bottom of downcast well pipe 1 and monitoring well 10, be filled with sealing clay 4, chimney filter
Grittiness filtrate 5, downcast well pipe 1 is filled between 6 and the hole wall of monitoring well 10 and between the hole wall of precipitation tube 7 and monitoring well 10
Inwall be longitudinally evenly equipped with several sensor for pore water pressures 3, each sensor for pore water pressure 3 respectively by wire connect data collecting instrument 8,
Data collecting instrument 8 connects monitoring computer 9, and chimney filter 6 connects outside suction pump by drinking-water pipe 12.
In this particular embodiment, chimney filter 6 includes the steel reinforcement cage of a diameter of 200mm～300mm and is coated on steel reinforcement cage
The filter screen (not shown) of periphery, the aperture of filter screen is 1～2mm, and the particle diameter of gravel filtrate 5 is 3～15mm；Monitoring well 10
Aperture is 550～600mm, a diameter of 300～450mm of downcast well pipe 1；The mouth of pipe of downcast well pipe 1 is above the ground level 0.50-1m.
Sensor for pore water pressure 3 is pore water pressure sensor, its a diameter of 1.5～12mm, and range is 100kPa～500kPa, sealing clay
Permeability little, its infiltration coefficient be 1.0 × 10-8Cm/s～1.0 × 10-10cm/s.
In this particular embodiment, data collecting instrument 8 has 20 to 120 passages, 4～6 half-resolution, and 0.004%
～0.004% basic DC precision, 200～250 passages/second scan rate, 10000～50000 reading storages.Outside suction pump
Can be using centrifugal water pump, immersion immersible pump or deep well pump etc., pump amount, lift must are fulfilled for water yield and the well depth of each well, often
Individual downcast well pipe 1 is individually with a pumping for water pump.Monitoring computer 9 is provided with Water level trend monitoring analysis software, this Water level trend
Monitoring analysis software possesses data processing, analysis, draws and warning function.
Embodiment two
A kind of deep basal pit artesian water precipitation dynamic monitoring method, specifically includes following steps：
(1) artesian water precipitation dynamic monitoring system setting
In the inwall of downcast well pipe 1, several sensor for pore water pressures 3 are longitudinally equidistantly installed, by the bottom of downcast well pipe 1 according to
Secondary connection chimney filter 6 and precipitation tube 7, and precipitation tube 7 bottom is shut；Mud off is bored using diving and opens up monitoring well 10, in prison
Divide into precipitation tube 7, chimney filter 6 and downcast well pipe 1 from down to up successively in well logging 10, and precipitation tube 7 and chimney filter 6 are arranged on to be measured
In artesian aquifer 11 region, return between the hole wall and precipitation tube 7 of monitoring well 10 and between the hole wall of monitoring well 10 and chimney filter 6
Back-up sand gravel filtrate 5, backfills sealing clay 4, in the hole wall of monitoring well 10 between the hole wall of monitoring well 10 and downcast well pipe 1 bottom
Backfill sealing of hole clay 2 and downcast well pipe 1 top between, each sensor for pore water pressure 3 is wired to data collecting instrument 8
On, data collecting instrument 8 is connected on monitoring computer 9, forms a complete artesian water precipitation dynamic monitoring system；
(2) Dynamic Data Acquiring analysis
Chimney filter 6 will be extended in drinking-water pipe 12, open pumping for water pump, and after stable level, time t is set to initial value
0, gather initial pore water pressure value P of each sensor for pore water pressure 3ij0, convert and obtain corresponding sensor for pore water pressure 3 below water level
Depth, and ID value H of sensor for pore water pressure 3 is set to thisij0；Continue to draw water, water level decreasing, gather t, each pore pressure
Pore water pressure force value P of sensor 3ijt, convert and obtain the depth value H of the corresponding sensor for pore water pressure of t 3ijt；By t pore pressure
The depth value H of sensor 3ijtDeduct ID value H of sensor for pore water pressure 3ij0, obtain drawdown △ of t sensor for pore water pressure 3
Hijt, take each sensor for pore water pressure 3 drawdown of t is averagely worth to t drawdown Hit, draw and obtain drawdown Hit
Curve relation figure and time t between is used for monitoring analysis；Pre-set target depth H, when reaching target depth H, system report
Alert prompting stops pumping, and returns to after certain altitude after water level, re-starts and draw water and monitor analysis, wherein i=1,2 ..., n are
Well is numbered, j=1, and 2 ..., n are the numbering of sensor for pore water pressure from top to bottom, and t is the time；
Because each well initial water level may be inconsistent, carry out data analysiss explanation it is assumed that it has 3 taking i-th mouthful of well as a example
Individual sensor for pore water pressure 3, then the initial pore water pressure value of each sensor for pore water pressure 3 be respectively Pi10、Pi20、Pi30, initial in dewatering well
Water level depth is hi1, first sensor for pore water pressure 3 water level depth below is hi2-hi1, below second sensor for pore water pressure 3 water level
Depth is hi3+hi2-hi1, the 3rd sensor for pore water pressure 3 water level depth below is hi4+hi3+hi2-hi1, then at the beginning of each sensor for pore water pressure 3
Beginning pore water pressure force value and water level depth relation are
After beginning of drawing water, water level decreasing, each sensor for pore water pressure 3 reading also declines therewith.In any t, each pore pressure
The initial pore water pressure value of sensor 3 is respectively Pi1t、Pi2t、Pi3t, then the water level depth value of each sensor for pore water pressure of t 3 be：
In any t, the drawdown that each sensor for pore water pressure 3 records is respectively:
Then t, drawdown H of i-th mouthful of wellitFor,
In monitoring system, automatically give H processed by above formulaitThe drawdown time-history curves of～t.
Work as Hit>hi2-hi1, i.e. drawdown exceeded the depth of first sensor for pore water pressure 3, this sensor for pore water pressure 3 pore pressure
Value Pi1tIt is zero, then cancel Δ Hi1tMean value calculation.Work as Hit>hi3+hi2-hi1, cancel Δ Hi2tMean value calculation, class successively
Push away.Wherein hi1tFor the initial water level depth in i-th mouthful of well, hi2tFor the 1st sensor for pore water pressure of i-th mouthful of well t elevation,
J takes 3,4 ..., during n, hijtFor -1 sensor for pore water pressure of i-th mouthful of well jth and -2 sensor for pore water pressures of jth t distance, i
=1,2 ..., n number for well, and j is the numbering of sensor for pore water pressure 3 from top to bottom, and t is the time, γwSevere (kN/m for water3),
Described elevation is sensor for pore water pressure 3 height from the ground.
In this particular embodiment, chimney filter 6 includes the steel reinforcement cage of a diameter of 200mm～300mm and is coated on steel reinforcement cage
The filter screen (not shown) of periphery, the aperture of filter screen is 1～2mm, and the particle diameter of gravel filtrate 5 is 3～15mm；Monitoring well 10
Aperture is 550～600mm, a diameter of 300～450mm of downcast well pipe 1；The mouth of pipe of downcast well pipe 1 is above the ground level 0.50-1m.
Sensor for pore water pressure 3 is pore water pressure sensor, its a diameter of 1.5～12mm, and range is 100kPa～500kPa sealing clay 4
Permeability little, its infiltration coefficient be 1.0 × 10-8Cm/s～1.0 × 10-10cm/s.
In this particular embodiment, data collecting instrument 8 has 20 to 120 passages, 4～6 half-resolution, and 0.004%
～0.004% basic DC precision, 200～250 passages/second scan rate, 10000～50000 reading storages.Outside suction pump
Can be using centrifugal water pump, immersion immersible pump or deep well pump etc., pump amount, lift must are fulfilled for water yield and the well depth of each well, often
Individual downcast well pipe 1 is individually with a pumping for water pump.Monitoring computer 9 is provided with Water level trend monitoring analysis software, this Water level trend
Monitoring analysis software possesses data processing, analysis, draws and warning function.
Embodiment three
Ningbo track traffic municipal government erect-position in East Zhongshan Road with liberation North Road intersection northeast side, now for sunlight square
Municipal greenery patches.Wide 20.5～the 24.8m of Line 1 station pit, is about 168.6m.Western end well foundation ditch is 25.3m deeply；Standard paragraphs base
The deep about 23.8m in hole.Diving static level height (being only 5.0m away from earth's surface), tier I porous confined groundwater preservation is in 6.58.1Layer powder
In sand, fine sand, coarse sand, gravelly sand and gravel layer, good water permeability, average infiltration coefficient about 30.5m/d, artesian water head 1.8m, water
Amount is abundant.According to engineering geology, the hydrogeologic condition of prospecting data offer, carry out Foundation Pit Pouring probability calculating, and foundation
Seepage flow formula calculates to Pit Discharge.Result shows, in Excavation Process, 8.1Layer artesian aquifer can be right
Station agent structure is excavated and is had an impact, being likely to result in prominent emerge in large numbers as.For guaranteeing security of foundation ditch construction, it need to be carried out at decompression
Reason.Due to this engineering excavation depth and surrounding enviroment complexity (adjoining municipal government, business district, construction of structures is intensive), therefore in base
Hole artesian water Precipitation Process needs keep under strict control precipitation depth and precipitation, the impact to environment for the effective control.
1st, determine pipe well quantity n
According to result of calculation, 8. the foundation ditch of this project subject structure need to arrange altogether1Six mouthfuls of the monitoring well and standby of layer
Two mouthfuls of wellhole (and inspection well)；Well depth 60.0m, the deep 52.0～59.0m water yield of well of pipe big (individual well yield 800～
1500m3/d).
2nd, dewatering well structure design
Open monitoring well 10 diameter：(well construction figure refers to accompanying drawing 1)；
Well head：0.3～0.5m above ground level, well head periphery adopts cohesive soil packing, and its depth is not less than 2.00m；
Downcast well pipe 1：Using welded still pipe, wall thickness 4mm, diameter
Chimney filter 6：Using circular hole bag net filter pipe, wall thickness 4mm, diameterOutsourcing 20 mesh zinc-iron silk screen；
Filtrate：Filtrate is made using gravelly sand, enclosing raising degree is 1.0～2.0m on the top board of shaft bottom to water-bearing layer.
Sealing：Filtrate section top clay ball sealing, sealing height 5.0～6.0m；
Enclose and fill out：Sealing section adopts viscosity earthen backfill to close with upper bit；
Precipitation tube 7：The same footpath with chimney filter 6, length 2.0m, precipitation tube 7 bottom sealing.
Using deep basal pit artesian water precipitation dynamic monitoring system specifically as described in above-mentioned specific embodiment one.
3rd, construction technology program
Well construction technique is become using mud circulation drilling, mechanical hoisting down tube
Well point measurement and positioning → the mouth that digs a well, Hospice Center's cylinder → rig be in place → boring → backfill shaft bottom sand bedding course → tie up bamboo chip,
Water is divided in gravel filter layer → well-flushing that nylon wire → hang well casing → sensor is installed → backfill between well casing and hole wall, well casing
Pump, install pumping control circuit → connection data collecting instrument and computer → examination draw water → dewatering well normal work → precipitation finishes and pulls out
Well casing → shut-in well.
In view of precipitation well depth 60.0m, 5 sensor for pore water pressures 3 are installed in setting in every mouthful of well, and setting depth is respectively
- 5 under table, -15, -25, -35, -50m place.According to the difference of each sensor for pore water pressure 3 fitting depth, in advance by sensor for pore water pressure 3
And wire sticks and is posted on downcast well pipe 1 inwall, with downcast well pipe 1 sinking to corresponding depth.Before formally drawing water, each pore pressure is passed
Sensor 3 is wired to data collecting instrument 8 and computer 9, forms a complete artesian water drawdown dynamic monitoring system
System, and after stable level, each sensor for pore water pressure of continuous acquisition 3 reading, frequency is not less than 3 times/day, and conversion obtains each pore pressure and passes
Sensor 3 is in water level depth below, and is set to sensor for pore water pressure 3 ID value H with thisij0, it is i is well numbering, j=1,
2 ..., 5 is sensor number from top to bottom.
Because each well initial water level may be inconsistent, carry out at the beginning of data analysiss explanation, 5 sensors taking the 1st mouthful of well as a example
Beginning pore water pressure force value is respectively Pi10、Pi20、Pi30、Pi40、Pi50.In any t after starting of drawing water, each sensor is initial
Pore water pressure force value is respectively Pi1t、Pi2t、Pi3t、Pi4t、Pi5t, then the initial pore water pressure value of each sensor and water level depth are closed
It is to be
Then t, drawdown H of the 1st mouthful of wellitFor,
In monitoring system, automatically give H processed by above formula1tThe drawdown time-history curves of～t.Correlation is drawn water data such as Fig. 2 institute
Show.In Fig. 2, S1 is No. 1 dewatering well, and S2, S3 are inspection well.Before precipitation, three mouthfuls of Well Water Levels respectively 5.246,4.905,5.057m,
August 3 days 19 in 2009:30 separate the beginning draws water, to 21:10 points of end, S1 well drawdown 7.48m.Stop pumping, water level is rapid
Recover.
Specific embodiment four
A kind of deep basal pit artesian water precipitation dynamic monitoring system is also as depicted in figs. 1 and 2.Ningbo City's Rail Transit Line 3
Yong Da way station total length about 166.059m, is four layers of underground station, and standard paragraphs width is 19.7m, intends using Open Cut Method construction.
Standard paragraphs foundation depth is 27.31m, and at end well, foundation depth is 28.91m.Place I-1Layer the main preservation of porous confined groundwater in
⑥2TIn layer powder soil horizon, infiltration coefficient about 10-3Cm/s, belongs to aquiclude；Local distribution, water yield is little, and watery is poor, and individual well gushes
The water yield is 50～100m3/ d, in 1.65m, water quality is salt water to artesian water depth to water.It is unfavorable to planning to build foundation pit construction tool
Impact.I2Layer porous confined groundwater preservation is in 8.1In layer powder fine sand soil, infiltration coefficient about 10-2Cm/s, water penetration belongs to medium, water
Amount is abundant, water outflow from single well 1500～1800m3/ d, depth to water is 2.94m.According to calculating, 6.2TLayer and 8.1Layer all exists prominent
The risk gushed is processed it is therefore necessary to be likely to occur the prominent foundation ditch gushing in advance.
1st, determine pipe well quantity n
According to result of calculation, 8. the foundation ditch of this project subject structure need to arrange altogether110 8 mouthfuls of the monitoring well and standby of layer
With two mouthfuls of well (and inspection well)；Well depth 62.0m, the deep 54.0～60.0m water yield of well of pipe big (individual well yield 800～
1500m3/d).
2nd, dewatering well structure design
Dewatering well structure design is with described in above-mentioned specific embodiment three.
3rd, construction technology program
Construction technology program is with described in above-mentioned specific embodiment three.In view of precipitation well depth 62.0m, arrange in every mouthful of well
Install 6 pore water pressure sensors, setting depth be respectively earth's surface under -5, -15, -25, -35, -40m, -55m place.Correlative measurement
Examination data calculates with described in above-mentioned specific embodiment three.Then t, drawdown H of the 1st mouthful of wellitFor,
In monitoring system, automatically give H processed by above formula1tThe drawdown time-history curves of～t.
Certainly, described above not limitation of the present invention, the present invention is also not limited to the example above.The art
Those of ordinary skill, in the essential scope of the present invention, the change made, remodeling, adds or replaces, and also should belong to the present invention's
Protection domain.
Claims (5)
1. a kind of deep basal pit artesian water precipitation dynamic monitoring method is it is characterised in that specifically include following steps：
(1) artesian water precipitation dynamic monitoring system setting
Longitudinally equidistantly several sensor for pore water pressures are installed in the inwall of downcast well pipe, the bottom of downcast well pipe is sequentially connected filter
Pipe and precipitation tube, and precipitation bottom of the tube is shut；Mud off is bored using diving and opens up monitoring well, in monitoring well from down to up
Divide into precipitation tube, chimney filter and downcast well pipe successively, and precipitation tube and chimney filter are arranged in artesian aquifer region to be measured, in monitoring
Gravel filtrate is backfilled, in hole wall and the fall of monitoring well between the hole wall of well and precipitation tube and between the hole wall of monitoring well and chimney filter
Backfill sealing clay between well pipe bottom, between the hole wall of monitoring well and downcast well pipe top, backfill sealing of hole clay, will be each
Individual sensor for pore water pressure is wired on data collecting instrument, data collecting instrument is connected on monitoring computer, forms one
Complete artesian water precipitation dynamic monitoring system；
(2) Dynamic Data Acquiring analysis
Chimney filter will be extended in drinking-water pipe, open pumping for water pump, and after stable level, time t is set to initial value 0, collection
Initial pore water pressure value P of each sensor for pore water pressureij0, convert and obtain corresponding sensor for pore water pressure in water level depth below, and with
This is set to ID value H of sensor for pore water pressureij0；Continue to draw water, water level decreasing, gather t, the hole of each sensor for pore water pressure
Gap hydraulic pressure force value Pijt, convert and obtain the depth value H of the corresponding sensor for pore water pressure of tijt；Depth by t sensor for pore water pressure
Value HijtDeduct ID value H of sensor for pore water pressureij0, obtain the drawdown △ H of t sensor for pore water pressureijt, take t each
Sensor for pore water pressure drawdown be averagely worth to t drawdown Hit, draw and obtain drawdown HitSong and time t between
Line graph of a relation is used for monitoring analysis；Pre-set target depth H, when reaching target depth H, system alarm prompting stops pumping,
Return to after certain altitude after water level, re-start and draw water and monitor analysis, wherein i=1,2 ..., n number for well, j=1,
2 ..., n are the numbering of sensor for pore water pressure from top to bottom, and t is the time.
2. a kind of deep basal pit artesian water precipitation dynamic monitoring method according to claim 1 is it is characterised in that in step (2)
T, pore water pressure force value P of each sensor for pore water pressureijtConversion obtains water level depth value H of corresponding sensor for pore water pressureijtMeter
Calculation method is as follows：
…………
Hint=hint+hi(n-1)t+hi(n-2)t-hi1t=Pint/rw
Wherein hi1tFor the initial water level depth in i-th mouthful of well, hi2tFor the 1st sensor for pore water pressure of i-th mouthful of well t height
Journey, j takes 3,4 ..., during n, hijtFor -1 sensor for pore water pressure of i-th mouthful of well jth and -2 sensor for pore water pressures of jth t away from
From, i=1,2 ..., n number for well, and j is the numbering of sensor for pore water pressure from top to bottom, and t is the time, γwSevere (kN/ for water
m3)；Described elevation is sensor for pore water pressure height from the ground；
As drawdown Hit>hi2t-hi1t, i.e. drawdown exceeded the depth of first sensor for pore water pressure, then first pore pressure
Sensor pore pressure value Pi1tIt is zero, then cancel Δ Hi1tMean value calculation；Work as Hit>hi3+hi2-hi1, cancel Δ Hi2tMeansigma methodss
Calculate, the like.
3. deep basal pit artesian water precipitation dynamic monitoring method according to claim 1 it is characterised in that：Described chimney filter bag
The filter screen including the steel reinforcement cage of a diameter of 200mm～300mm and being coated on described steel reinforcement cage periphery, the aperture of described filter screen
For 1～2mm, the particle diameter of described gravel filtrate is 3～15mm.
4. deep basal pit artesian water precipitation dynamic monitoring method according to claim 1 it is characterised in that：Described monitoring well
Aperture be 550～600mm, a diameter of 300～450mm of described downcast well pipe；The mouth of pipe of described downcast well pipe is higher than
Ground 0.50-1m.
5. deep basal pit artesian water precipitation dynamic monitoring method according to claim 1 it is characterised in that：Described pore pressure passes
Sensor is pore water pressure sensor, its a diameter of 1.5～12mm, and range is 100kPa～500kPa.
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