CN105421498A - Foundation pit anti-seepage and settlement control method based on stereoscopic curtain-well group system - Google Patents
Foundation pit anti-seepage and settlement control method based on stereoscopic curtain-well group system Download PDFInfo
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- CN105421498A CN105421498A CN201510780820.1A CN201510780820A CN105421498A CN 105421498 A CN105421498 A CN 105421498A CN 201510780820 A CN201510780820 A CN 201510780820A CN 105421498 A CN105421498 A CN 105421498A
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- curtain
- foundation pit
- gang
- wells
- foundation ditch
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
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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
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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
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (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)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention provides a foundation pit anti-seepage and settlement control method based on a stereoscopic curtain-well group system. The system is composed of vertical curtains of unequal depths, a horizontal curtain grid and a precipitation well group in a foundation pit. The horizontal curtain grid structure is established based on traditional vertical curtains of unequal depths, and a limited water blocking body in an underground space is formed; by reasonably optimizing the well group structure, and the head loss during underground water movement is increased by sufficiently utilizing the curtain energy consumption theory, so that the purpose of decreasing the drawdown of underground water outside the foundation pit and accordingly decreasing the settlement amount is achieved. According to the stereoscopic curtain-well group system, the wall-well functional mechanism is utilized sufficiently, the problem of instability of the foundation pit caused by seepage can be effectively solved, and foundation pit dewatering is controlled so that ground settlement amount can be prevented; meanwhile, compared with horizontal totally-closed curtains, the project amount and project cost are greatly reduced, and great social benefits and economic benefits are achieved.
Description
Technical field
The invention belongs to geotechnical engineering, Geological Engineering field, especially relate to a kind of foundation ditch percolation-proof based on three-dimensional curtain-gang of wells system and subsidence control method.
Background technology
In foundation pit dewatering process, when vertical water-stop curtain thoroughly cannot cut off precipitation aquifer, foundation ditch groundwater abstraction will produce in precipitation target aquifer to be affected in a big way, to cause the problems such as groundwater resources waste, primary hydrogeological environment disturbance, neighbouring surface settlement, draining simultaneously also may produce a large amount of burden to urban operating mechanism.
Build the foundation ditch in building dense district, need control settlement, the method that may adopt nothing more than every, fall, fill with, and recharge often be difficult to extensive enforcement because place problem cannot solve in implementation process.Recharging is the inverse process of precipitation, takes out to fill with that to combine be exactly the process of a huge power consumption.When recharge well distance foundation ditch is nearer, drawdown in foundation ditch also may be caused not up to standard.Meanwhile, recharge and will cause the disturbance of the soil body many phases, sedimentation and inhomogeneous deformation may be aggravated on the contrary.At present, domestic existing foundation ditch adopts totally-enclosed curtain (vertical curtain+horizontal grout curtain) to realize the control of underground water, but construction costs is high, and when the horizontal grout curtain degree of depth required is larger, constructional difficulties and difficult quality control.
Summary of the invention
The object of the invention is to overcome a kind of foundation ditch percolation-proof based on three-dimensional curtain-gang of wells system and subsidence control method that above-mentioned technological deficiency provides.
Object of the present invention can be achieved through the following technical solutions:
Based on foundation ditch percolation-proof and the subsidence control method of three-dimensional curtain-gang of wells system, it is characterized in that, this method utilizes the vertical dark curtain such as not and level to form three-dimensional curtain to curtain grid technology.
The described vertical dark curtain 1 such as is not arranged on foundation ditch outer rim (the described vertical dark curtain such as not belongs to prior art), in order to stop underground water under the effect of the inside and outside water-head of foundation ditch by the level of carrying out in the export-oriented foundation ditch of foundation ditch to seepage flow.
Described level to curtain grid 2 refer to when the simple vertical dark curtain such as not can not meet drawdown outside foundation ditch require or likely occur at the bottom of foundation ditch quicksand, piping, prominent the bad phenomenon such as to gush time, by the method such as churning or high pressure grouting, at the continuous cement-soil horizontal grout curtain grid apart from the tool some strength and anti-permeability performance of cheating the setting of a distance, the end.Level is conduct oneself with dignity with level certain thickness soil between oozing at the bottom of body deadweight, frictional force between engineering pile and base plate and base plate and hole to the key of curtain grid 2, and the uplift pressure balancing underground water is gushed to prevent the generation of the end, hole from dashing forward.Meanwhile, the utilization part effect that blocks water increases head loss in underground water vertical flow event, reaches the object reducing the outer aquifer drawdown of foundation ditch.
Described gang of wells system 3 is measures (described gang of wells system belongs to prior art) of a kind of widely used underground dewatering water level, well-points dewatering refers to the precipitation well point (laying with tubulose) buried underground in the foundation ditch of construction project to be built and can seep water, configure certain pumping equipment, continual underground water to be taken away, the groundwater level within the scope of foundation ditch is made to be down to desired depth, ensure that base pit engineering can carry out in drier construction environment, meet anti-the dashing forward of foundation ditch simultaneously and gush requirement.In the present invention, gang of wells system 3 is laid and is arranged in above horizontal grout curtain grid 2 by pumped well by fixing well spacing.
The comprehensive two kinds of curtain forms of this method and gang of wells system, the basis of the vertical dark curtain such as or not tradition builds level to curtain cell structure, form the limited body that blocks water in the underground space, by reasonably optimizing gang of wells structure, make full use of the head loss in curtain power consumption principle increase ground water movement process, reach and reduce the outer underground water drawdown of foundation ditch thus the object reducing settling amount.This three-dimensional curtain-gang of wells system makes full use of wall-well mechanism of action, effectively can control foundation pit dewatering and cause surface subsidence problem, meanwhile, compared to the totally-enclosed curtain of level, greatly reduces engineering quantity and construction costs, has good economic results in society.
Vertical curtain Main Function in three-dimensional curtain prevents blending around oozing, and the effect of horizontal grout curtain prevents blending energy dissipating, namely be not bonded together with comparatively heavy thickness and intensity and vertical curtain, not with the severe launching stress evenly increased, main dependence horizontal grout curtain top soil galassing weighing apparatus curtain launching stress, realize energy dissipation below spillway with limited thickness and seepage flow, reduce and water pressure and reduce pump-out.
Accompanying drawing explanation
Fig. 1 is the perspective view of the inventive method;
Fig. 2 is that level is to curtain grid plan structure figure;
Fig. 3 is three-dimensional curtain-gang of wells system actual effect sectional drawing;
Fig. 4 is three-dimensional curtain-gang of wells system techniqueflow chart;
Description of symbols: 1-does not wait dark vertical curtain wall, 2-horizontal grout curtain grid, 3-precipitation gang of wells, 4-foundation ditch bottom surface.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
Principle analysis
The inventive method proposes to utilize and does not wait dark vertically curtain, level to form three-dimensional curtain to curtain grid technology.
Described do not wait dark vertical curtain to be arranged on foundation ditch outer rim, in order to stop the outer underground water water-head inside and outside foundation ditch of foundation ditch effect under to the seepage flow in foundation ditch, and prevent the seepage erosion producing quicksand etc. thus.
Three-dimensional curtain is except except the effect of oozing, mainly by around oozing, energy dissipating comes and pumped well flock mating conjunction in hole, to construct in aquifer Local Artificial top board, consumed energy is oozed by resistance, reduce gang of wells pump-out, under the mating reaction of limited solid curtain, the main gang of wells that draws water that utilizes realizes precipitation decompression.
Thus build the conceptual model of three-dimensional curtain-gang of wells foundation pit dewatering system, set up three-dimensional curtain-gang of wells architectural framework.
Horizontal grout curtain grid described in the three-dimensional curtain that this method proposes, refer to when the simple vertical dark curtain such as not can not meet likely to occur at the bottom of requirement of settlement control or foundation ditch quicksand, piping, prominent the bad phenomenon such as to gush time, by the method such as churning or high pressure grouting, at the continuous cement-soil horizontal grate plate body apart from the tool some strength and anti-permeability performance of cheating the setting of a distance, the end.Level is conduct oneself with dignity with level certain thickness soil between oozing at the bottom of body deadweight, frictional force between engineering pile and base plate and base plate and hole to the key of curtain grid, and the uplift pressure balancing underground water is gushed to prevent the generation of the end, hole from dashing forward.Namely be not bonded together with comparatively heavy thickness and intensity and vertical curtain, not with the severe launching stress evenly increased, main dependence horizontal grout curtain grid top soil galassing weighing apparatus curtain launching stress, realizes energy dissipation below spillway with limited thickness and seepage flow, reduces and water pressure and reduce pump-out.
In super-sized foundation pit, effectively cannot utilize the effect of wall well and the high problem of closed curtain cost for the vertical curtain of foundation pit dewatering centre mounted type in the past, propose to build the three-dimensional curtain system that vertical curtain is separated with horizontal grout curtain.Construct horizontal grout curtain grid with suspended cutoff unlike three-dimensional curtain and with the vertical dark curtain acting in conjunction such as not, water proof can be realized and subtract oozing energy dissipating in horizontal and vertical directions simultaneously.Do not engage with vertical curtain unlike horizontal grout curtain in three-dimensional curtain with closed curtain, discontented hall is laid, not definitely water shutoff, utilizes seepage flow energy dissipating to reduce exit head pressure, reduces wells group dewatering pressure, finally utilizes gang of wells to realize precipitation decompression.
Embodiment
In specific embodiment, as shown in Figure 1, first carry out the vertical dark curtain 1 such as or not construct, for deep foundation ditch, usually can adopt diaphragm wall, vertical curtain bottom is not waited dark, makes to connect into fluid-tight soldier pile not wait dark vertical curtain 1.Horizontal grout curtain grid 2 can adopt the method such as high-pressure rotary-spray, MJS, slip casting, make it not with comparatively heavy thickness and intensity and not etc. dark vertical curtain 1 be bonded together, horizontal grout curtain grid 2 is positioned at foundation ditch bottom surface less than 4, and apart from foundation ditch bottom surface below 1m, in foundation ditch, vertical direction serves part resistance effect.Pumped well is arranged in foundation ditch by even laying mode with fixing well spacing by gang of wells system 3, owing to increasing horizontal grout curtain, therefore its quantity is by much smaller than without under horizontal grout curtain condition, dewatering well should be positioned at above horizontal grout curtain grid 2, and underground water is extracted out by gang of wells system 3 by horizontal grout curtain grid 2 space.Gang of wells system 3 is made up of some dewatering wells.
Described MJS, full name: comprehensive high-pressure injection method.
As shown in Figure 3, underground water under the effect of the inside and outside water-head of foundation ditch by the level of carrying out in the export-oriented foundation ditch of foundation ditch to seepage flow, walk around the vertical dark curtain 1 such as or not then flow to horizontal grout curtain grid 2, vertically not etc. dark curtain 1 does not play resistance effect to a certain extent, but incomplete water proof.Underground water is because uplift pressure continuation is to top seepage flow, at this moment horizontal grout curtain grid 2 is conducted oneself with dignity with level certain thickness soil between oozing at the bottom of body deadweight, frictional force between engineering pile and base plate and base plate and hole, prominent gushing is there is in the uplift pressure balancing underground water to prevent the end, hole, part underground water is by horizontal grout curtain grid 2, detach foundation ditch by gang of wells system 3, realize precipitation decompression conversely.
As shown in Figure 4, in base pit engineering, for quicksand, piping, the prominent bad phenomenon such as to gush likely appear in prevention underground water under the effect of the inside and outside water-head of foundation ditch at the bottom of the level of carrying out in the export-oriented foundation ditch of foundation ditch is at the bottom of seepage flow or foundation ditch, precipitation and curtain is taked to cut off measure, described precipitation and gang of wells system precipitation method, cut down the head after reducing pressure, reduce the pressure that curtain bears; The three-dimensional curtain of described curtain partition and above-mentioned horizontal grout curtain grid 2 and vertical curtain 1 combination, realizes energy dissipation below spillway with limited thickness and seepage flow, reduces and water pressure and reduce pump-out.Three-dimensional curtain and gang of wells coordinate, and form three-dimensional curtain-gang of wells system, and achieve precipitation and control, foundation ditch periphery does not produce obvious drawdown and sedimentation.
Claims (1)
1. based on foundation ditch percolation-proof and the subsidence control method of three-dimensional curtain-gang of wells system, it is characterized in that, be made up of to curtain grid and precipitation well in foundation pit group vertical dark curtain, the level such as not, set up three-dimensional curtain-gang of wells architectural framework, wherein:
The vertical dark curtain (1) such as is not utilized to form three-dimensional curtain with level to curtain grid (2);
On the basis of the vertical dark curtain (1) such as or not tradition, structure level is to curtain grid (2) structure, forms the limited body that blocks water in the underground space,
By gang of wells (3) structure, make full use of the head loss in curtain power consumption principle increase ground water movement process, reach and reduce the outer underground water drawdown of foundation ditch thus the object reducing settling amount;
This three-dimensional curtain-gang of wells system makes full use of wall-well mechanism of action, effectively can prevent from the instability of foundation pit problem because seepage flow produces and control foundation pit dewatering causing ground settlement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510780820.1A CN105421498B (en) | 2015-11-16 | 2015-11-16 | A kind of foundation ditch water-impervious and subsidence control method based on three-dimensional curtain gang of wells system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510780820.1A CN105421498B (en) | 2015-11-16 | 2015-11-16 | A kind of foundation ditch water-impervious and subsidence control method based on three-dimensional curtain gang of wells system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105421498A true CN105421498A (en) | 2016-03-23 |
| CN105421498B CN105421498B (en) | 2017-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510780820.1A Active CN105421498B (en) | 2015-11-16 | 2015-11-16 | A kind of foundation ditch water-impervious and subsidence control method based on three-dimensional curtain gang of wells system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106703752A (en) * | 2016-12-03 | 2017-05-24 | 吉林大学 | System closing method used for oil shale underground in-situ exploitation |
| WO2020098727A1 (en) * | 2018-11-16 | 2020-05-22 | 卫振海 | Method for constructing underground fresh water collection facility on coral island and reef |
| CN112681354A (en) * | 2021-01-24 | 2021-04-20 | 中国电建市政建设集团有限公司 | Novel active anti-seepage subway station bottom plate structure and construction method thereof |
Citations (3)
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| JPS61254720A (en) * | 1985-05-02 | 1986-11-12 | Ohbayashigumi Ltd | Construction work of embankment |
| CN204098050U (en) * | 2014-09-22 | 2015-01-14 | 中南勘察设计院（湖北）有限责任公司 | A kind of control artesian water precipitation system |
| CN104695456A (en) * | 2015-03-27 | 2015-06-10 | 济南轨道交通集团有限公司 | Construction method novel vertical shaft horizontal rotation jet grouting pile foundation pit lateral wall water stopping curtain |
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2015
- 2015-11-16 CN CN201510780820.1A patent/CN105421498B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61254720A (en) * | 1985-05-02 | 1986-11-12 | Ohbayashigumi Ltd | Construction work of embankment |
| CN204098050U (en) * | 2014-09-22 | 2015-01-14 | 中南勘察设计院（湖北）有限责任公司 | A kind of control artesian water precipitation system |
| CN104695456A (en) * | 2015-03-27 | 2015-06-10 | 济南轨道交通集团有限公司 | Construction method novel vertical shaft horizontal rotation jet grouting pile foundation pit lateral wall water stopping curtain |
Non-Patent Citations (1)
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| 王建秀等: ""深基坑降水中墙-井作用机理及工程应用"", 《地下空间与工程学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106703752A (en) * | 2016-12-03 | 2017-05-24 | 吉林大学 | System closing method used for oil shale underground in-situ exploitation |
| CN106703752B (en) * | 2016-12-03 | 2019-04-19 | 吉林大学 | A kind of system enclosure method for oil shale underground in situ exploitation |
| WO2020098727A1 (en) * | 2018-11-16 | 2020-05-22 | 卫振海 | Method for constructing underground fresh water collection facility on coral island and reef |
| CN112681354A (en) * | 2021-01-24 | 2021-04-20 | 中国电建市政建设集团有限公司 | Novel active anti-seepage subway station bottom plate structure and construction method thereof |
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| Publication number | Publication date |
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| CN105421498B (en) | 2017-06-13 |
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