CN108625383A - A kind of complete partition-type Method on Dewatering of Foundation Pit - Google Patents
A kind of complete partition-type Method on Dewatering of Foundation Pit Download PDFInfo
- Publication number
- CN108625383A CN108625383A CN201810637606.4A CN201810637606A CN108625383A CN 108625383 A CN108625383 A CN 108625383A CN 201810637606 A CN201810637606 A CN 201810637606A CN 108625383 A CN108625383 A CN 108625383A
- Authority
- CN
- China
- Prior art keywords
- foundation pit
- well
- dewatering
- type
- partition
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Abstract
A kind of complete partition-type Method on Dewatering of Foundation Pit, includes the following steps：（1）Determine complete partition-type foundation pit area and hydrogeologic condition；（2）Determine precipitation depth；（3）Determine partition-type foundation pit total displacement；（4）Calculate water yield of well；（5）Determine the duration；（6）Calculate foundation pit well spacing quantity；（7）Pattern of well is determined according to foundation pit well spacing quantity and foundation pit shape, and prepares construct required pumping equipment and material.A kind of complete partition-type base pit dewatering provided by the invention determines method, in the case where determining the duration, can carry out base pit dewatering design according to foundation pit area, precipitation depth and corresponding hydrogeologic condition, foundation is provided for the design of partition-type base pit dewatering.The method of the present invention is simple, practical, convenient for control duration efficent use of resources, has prodigious application value.
Description
Technical field
The present invention relates to a kind of complete partition-type Method on Dewatering of Foundation Pit, dependent territory builds technical field of construction.
Background technology
It is directed to the base pit dewatering technology constantly improve of various complex environments at present, base pit dewatering design specification is also more and more detailed
To the greatest extent.But existing base pit dewatering design specification is for there are the foundation pits that seepage flow is fed.Complicated soft clay layer border on the sea usually
Using enclosed structure water proof, wherein complete partition-type foundation pit is very universal in Shanghai.Lower part water proof is goed deep into for this enclosed structure
Layer, there is no cheating outer seepage flow to feed, foundation pit of the well-points dewatering for the purpose of drainage base mine water, when construction often without
It calculates, according to engineering experience well spacing, this results in that the duration can not be controlled well, or results in waste of resources.
Therefore, complete partition-type foundation pit is reasonably calculated according to the given duration, one economy of design has
The precipitation scheme of effect is a very real technical problem.
Invention content
For deficiency present in above-mentioned existing detail design, technical problem to be solved by the invention is to provide a kind of energy
In the case of the given duration, required dewatering well quantity is calculated according to foundation pit area, precipitation depth and corresponding hydrogeologic condition
Dewatering Design Method.
In order to solve the above technical problem, the present invention provides a kind of complete partition-type Method on Dewatering of Foundation Pit, are related to water proof curtain
Curtain stretch into lower part water barrier, using before excavation of foundation pit in drainage foundation pit intrinsic underground water as purpose well-points dewatering operation.
A kind of complete partition-type Method on Dewatering of Foundation Pit of the present invention, is as follows：
(1) complete partition-type foundation pit area and hydrogeologic condition are determined；
(2) precipitation depth h is determined；
(3) partition-type foundation pit total displacement V is determined,
V=S*h* μ
Wherein, S is the foundation pit area；H is precipitation depth；μ is water-bearing layer specific yield；
(4) water yield of well is calculated, water yield of well q takes pipe well to allow max water yield：
Wherein, r is chimney filter radius；L is chimney filter length；K is infiltration coefficient；
(5) duration t is determined；
(6) foundation pit well spacing quantity n is calculated,
Wherein：λ is regulation coefficient, and it is foundation pit total displacement to take 1.1, V, and q is water yield of well, and t is to determine the duration；
(7) pattern of well is determined according to foundation pit well spacing quantity and foundation pit shape, and prepare to construct required pumping equipment and
Material.
Water barrier is stretched into the bottom of the water seal curtain of the complete partition-type foundation pit, and well-points dewatering is with intrinsic in drainage foundation pit
For the purpose of underground water.
The area that the area S of the partition-type foundation pit is surrounded by foundation pit peripheral structure (water seal curtain).
The pattern of well is using checkerboard type uniform arrangement in hole, every area S/n cloth a wells.
The well spacing quantity can adjust the design of precipitation pipe well, pass through change when it is definite value to require dewatering well quantity n
Chimney filter radius r, the chimney filter length L of precipitation pipe well controls water yield of well q, to reach precipitation requirement at the appointed time.
The invention has the advantages that a kind of complete partition-type base pit dewatering provided by the invention determines method, in the duration
In the case of determination, base pit dewatering design can be carried out according to foundation pit area, precipitation depth and corresponding hydrogeologic condition, for partition
The design of formula base pit dewatering provides foundation.The method of the present invention is simple, practical, convenient for control duration efficent use of resources, has very
Big application value.
Description of the drawings
Fig. 1 is the flow chart of the method for the invention；
Fig. 2 is partition-type foundation pit schematic diagram；
Fig. 3 is case study on implementation dewatering well floor plan of the present invention；
In figure, 1 is dewatering well；2 be water seal curtain；3 be phreatic aquifer；4 be water barrier.
Specific implementation mode
The specific implementation mode of the present invention is as shown in Figure 1.Fig. 1 is a kind of complete partition-type Method on Dewatering of Foundation Pit of the present invention
Flow chart.Fig. 2 is partition-type foundation pit schematic diagram, wherein 1 is dewatering well, 2 be water seal curtain, and 3 be phreatic aquifer；4 be water proof
Layer.
The specific implementation of the embodiment of the present invention it is as shown in Figure 3.
As shown in figure 3, Foundation Pit in Shanghai engineering is quasi- to excavate 16.5m, deep phreatic aquifer is existed below away from earth's surface 0.8m,
Average infiltration coefficient is 0.52m/d, and lower sleeping impermeable stratum top plate is away from earth's surface 32.5m, will to ensure being smoothed out for excavation of foundation pit
Underground water potential drop extremely hole bottom 2m or less, it is desirable that complete drainage precipitation in 5 days.Peripheral three axis cement mixing pile stake bottoms enter Muddy Bottoms powder
Matter clay velatively waterproof layer forms totally enclosed type foundation pit, about 12841 square metres of building enclosure institute surround the area.
The present embodiment provides a kind of complete partition-type base pit dewatering design methods, are used for above-mentioned engineering, the method includes
Following steps：
The first step determines complete partition-type foundation pit area S and hydrogeologic condition；
Through investigation, foundation pit on-site underground is distributed phreatic aquifer：
Phreatic aquifer is mainly made of sandy silt and very soft sill clay, and thick 32.5m, water is small, easy drainage；
Average osmotic coefficient k is 0.52m/d.
This Pit Enclosure structure and precipitation scheme as shown in figure 3, peripheral three axis cement mixing piles as water-stop curtain,
Stake bottom enters very soft sill clay velatively waterproof layer, forms totally enclosed type foundation pit.
Foundation pit area is about S=12841m2。
Second step determines precipitation depth h；
Precipitation depth h=16.5-0.8+2=17.7m.
Third step determines partition-type foundation pit total displacement V；
Specific yield μ takes empirical value 0.1, V=S*h* μ=12841*17.7*0.1=22729m3。
4th step calculates water yield of well q；
To meet the excavation demand of foundation pit, using Application of light well point precipitation, well depth 20m, filter are designed according to related specifications
Locate below ground level 18~20m, and chimney filter radius and chimney filter length take 150mm and 2m respectively.
Then water yield of well takes
6th step calculates well spacing quantity n；
7th step determines pattern of well according to well spacing quantity n and foundation pit shape.
Every area S/n=233m2Cloth a well, as shown in figure 3, using checkerboard type uniform arrangement in hole, about every 233 is flat
Square rice arranges a well.
Claims (5)
1. a kind of complete partition-type Method on Dewatering of Foundation Pit, which is characterized in that the described method comprises the following steps：
(1) complete partition-type foundation pit area and hydrogeologic condition are determined；
(2) precipitation depth h is determined；
(3) partition-type foundation pit total displacement V, V=S*h* μ are determined
Wherein, S is the foundation pit area；H is precipitation depth；μ is water-bearing layer specific yield；
(4) water yield of well is calculated, water yield of well q takes pipe well to allow max water yield：Wherein, r is filter
Pipe radius；L is chimney filter length；K is infiltration coefficient；
(5) duration t is determined；
(6) foundation pit well spacing quantity n is calculated,
Wherein：λ is regulation coefficient, and it is foundation pit total displacement to take 1.1, V, and q is water yield of well, and t is to determine the duration；
(7) pattern of well is determined according to foundation pit well spacing quantity and foundation pit shape, and prepares construct required pumping equipment and material.
2. complete partition-type Method on Dewatering of Foundation Pit according to claim 1, it is characterised in that：The complete partition-type foundation pit
The bottom of water seal curtain stretch into water barrier, well-points dewatering is for the purpose of intrinsic underground water in drainage foundation pit.
3. a kind of complete partition-type Method on Dewatering of Foundation Pit according to claim 1, which is characterized in that the partition-type foundation pit
The areas that are surrounded by foundation pit peripheral structure of area S.
4. a kind of complete partition-type Method on Dewatering of Foundation Pit according to claim 1, which is characterized in that the pattern of well is adopted
With checkerboard type uniform arrangement in hole, every area S/n cloth a wells.
5. a kind of complete partition-type Method on Dewatering of Foundation Pit according to claim 1, which is characterized in that the well spacing quantity,
When it is definite value to require dewatering well quantity n, the design of precipitation pipe well is can adjust, by the chimney filter radius r, the filter that change precipitation pipe well
Length of tube L controls water yield of well q, to reach precipitation requirement at the appointed time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810637606.4A CN108625383A (en) | 2018-06-20 | 2018-06-20 | A kind of complete partition-type Method on Dewatering of Foundation Pit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810637606.4A CN108625383A (en) | 2018-06-20 | 2018-06-20 | A kind of complete partition-type Method on Dewatering of Foundation Pit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108625383A true CN108625383A (en) | 2018-10-09 |
Family
ID=63692038
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810637606.4A Pending CN108625383A (en) | 2018-06-20 | 2018-06-20 | A kind of complete partition-type Method on Dewatering of Foundation Pit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108625383A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110016924A (en) * | 2019-04-23 | 2019-07-16 | 华东交通大学 | A kind of partition-type base pit dewatering design method considering rainfall recharge |
-
2018
- 2018-06-20 CN CN201810637606.4A patent/CN108625383A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 陈琦: ""全封闭深基坑降水技术探析"", 《福建建筑》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110016924A (en) * | 2019-04-23 | 2019-07-16 | 华东交通大学 | A kind of partition-type base pit dewatering design method considering rainfall recharge |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103590425B (en) | A kind of Peaty soft soil stratum subway station construction technology | |
| CN104131575B (en) | A kind of karst height grows the leak stopping water discharge method of the stratum dam foundation | |
| CN102535488B (en) | Waterproof construction method for bottom plate of high-water-level basement | |
| CN102454167A (en) | Construction method for large ultra-deep well | |
| CN102926376B (en) | One is reclaimed fields from the sea region soft-soil foundation treatment method | |
| CN107587516A (en) | A kind of efficient sealing of Follow-up type hinders sand precipitation hybrid system and its construction method | |
| CN106975653A (en) | It is a kind of to prevent the permeable reactive barrier in-situ remediation method of pollution of underground aquifers | |
| CN105544622B (en) | A kind of anti-floating system and its checking device of underground structure | |
| CN104206064A (en) | Underground salt elimination method for saline and alkali land | |
| CN110387896A (en) | Base pit dewatering well design method | |
| CN110984200B (en) | Method for draining water of foundation pit of binary geological structure layer | |
| CN108867673A (en) | A kind of underwater prevention method in the foundation pit based on the curtain that draws water | |
| Stevanović | Damming underground flow to enhance recharge of karst aquifers in the arid and semi-arid worlds | |
| CN103215945B (en) | The three-dimensional assembly power drain consolidation system of heterogeneous body place soft soil foundation and method | |
| CN103343690A (en) | Shaft antiseep structure used when large section of inclined shaft passes through aquifer and construction method thereof | |
| CN203247575U (en) | Stereoscopic combined type dynamic drainage consolidation system used for heterogeneous field soft foundation | |
| CN108625383A (en) | A kind of complete partition-type Method on Dewatering of Foundation Pit | |
| CN106337422B (en) | A method of processing Collapsible Loess District fill foundation | |
| CN202440826U (en) | Waterproof system for high-water level basement foundation slabs | |
| CN101886385B (en) | Construction process of long-auger jet-grouting mixing curtain pile | |
| CN103556641A (en) | Grooving assisting method for in-pit underground diaphragm wall of existing basement | |
| CN101634140B (en) | Consolidation method of soft earth foundation | |
| CN215290068U (en) | Large-area electroosmosis separation well point dewatering system for soft soil foundation | |
| CN104775444B (en) | A kind of method for wet environment protection archeological site earthen ruins Yield rainfall relation | |
| CN111287205A (en) | Deep multi-stage dynamic foundation pit dewatering system and dewatering method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20181009 |