CN105133629B - A kind of determination method of refuse landfill Groundwater Control System Halt water curtain - Google Patents
A kind of determination method of refuse landfill Groundwater Control System Halt water curtain Download PDFInfo
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- CN105133629B CN105133629B CN201510435699.9A CN201510435699A CN105133629B CN 105133629 B CN105133629 B CN 105133629B CN 201510435699 A CN201510435699 A CN 201510435699A CN 105133629 B CN105133629 B CN 105133629B
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- 239000003673 groundwater Substances 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 22
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- 239000002689 soil Substances 0.000 claims description 20
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Abstract
The present invention discloses a kind of determination method of refuse landfill Groundwater Control System Halt water curtain, comprising the following steps: determines dike structure form and dam body section；Using jet grouting as water-stop curtain, the structure type of water-stop curtain is determined；The relevant parameter for determining water-stop curtain drafts the size of water-stop curtain；According to the relevant parameter of the water-stop curtain, and the size drafted, chronically launching analysis is carried out using numerical simulation；Determine construction technology.Using high pressure jet grouting as water-stop curtain, the structure type of reasonable selection water-stop curtain, it is possible to reduce the section of water-stop curtain substantially reduces project cost while meeting engineering stability and security requirement.The relevant parameter for determining water-stop curtain can be used as manufacture bases, guiding construction.Chronically launching analysis is carried out for the water-stop curtain of design, to provide theoretical foundation and technical support for water-stop curtain as permanent technical measures.
Description
Technical field
The present invention relates to Groundwater Control fields, and in particular to a kind of refuse landfill Groundwater Control System Halt water curtain
The determination method of curtain.
Background technique
Core as landfill yard engineering --- landfill area, the superiority and inferiority of design directly influence building for garbage loading embeading project
Bidding standard and service life.To obtain biggish landfill storage capacity, preferably carry out " evaluation ".For being in alluvial plain of Huanghe
Place, level of ground water is higher, while geology soil condition is poor, will be to cutting depth, side slope if groundwater level control is ineffective
Stablize, earthwork balance design affects greatly.Simultaneously for the landfill biggish partial region of area's area, the long period is needed to control
System, if there is underground water intrusion, can harm the performance of leakage preventing structure safety and impervious material, sanitary landfills design requirement is not achieved,
There are larger hidden dangers.So the control and design of underground water are the difficult point and emphasis of Construction of Refuse Landfill Yard success or failure.
In addition, high-pressure slip-casting as water-stop curtain technology in deep basal pit, subway, watch out for etc. in engineerings using relatively wide.Mirror
In such engineering the characteristics of, this technical measures of high-pressure slip-casting do not have often only as a kind of provisional measure of construction period
Have and pays attention to as permanent technical measures.
Refuse landfill generally requires to carry out the control of underground water.For the control method of underground water, conventional is to select
The form of whirl spraying.It has the disadvantage in that
It is to have additional lotus to place for upper building 1. traditional high-pressure slip-casting water-stop curtain uses whirl spraying and swaying-jet-grouting
In the case where load, used Groundwater Control form；Refuse landfill top does not have additional load, using traditional sealing curtain
The section of curtain structure form is very thick, causes a degree of waste.
2. traditional refuse landfill Groundwater Control system design in, only using water-stop curtain as provisional measure into
Row analysis, cannot ensure the long-term running safety of refuse landfill.
Summary of the invention
To solve deficiencies of the prior art, the present invention is provided in a kind of refuse landfill Groundwater Control system
The determination method of water-stop curtain.
To achieve the above object, the present invention adopts the following technical scheme:
A kind of determination method of refuse landfill Groundwater Control System Halt water curtain, comprising the following steps:
Step 1: determining dike structure form and dam body section；
Step 2: using jet grouting as water-stop curtain, determining the structure type of water-stop curtain；
Step 3: determining the relevant parameter of water-stop curtain, draft the size of water-stop curtain；
Step 4: according to the relevant parameter of the water-stop curtain, and the size drafted, it is carried out chronically using numerical simulation
Launching analysis.
Embankment is most important building structure object in plain type landfill yard, makes an investment in fully invested and occupies comparable ratio
Example selects reasonable embankment form significant to project cost is reduced.
Using high pressure jet grouting as water-stop curtain, the structure type of reasonable selection water-stop curtain, it is possible to reduce sealing
The section of curtain substantially reduces project cost while meeting engineering stability and security requirement.
The relevant parameter for determining water-stop curtain can be used as manufacture bases, guiding construction.
Chronically launching analysis is carried out for the water-stop curtain of design, to mention water-stop curtain as permanent technical measures
For theoretical foundation and technical support.
Wherein, in step 1, the embankment uses and rolls native stone embankment.
The advantages of compaction type soil stone embankment is construction is simple, lower to geological conditions requirement, and operating expenses is low, can drop significantly
Low project cost.
In step 2, the water-stop curtain uses single directional swing spray structure type.
Traditional curtain-grouting is all made of whirl spraying structure.This method incorporation engineering feature, by directional swing spray structure type application
To water-stop curtain, cement consumption can be reduced, project cost is effectively reduced.
In step 3, the relevant parameter includes the infiltration coefficient of water-stop curtain, and the size includes the depth of water-stop curtain
Degree, the quantity of cloth hole, cloth hole effective depth and pitch-row.
The infiltration coefficient for determining water-stop curtain, in the case where underground hydrological condition is certain, for the ruler for determining water-stop curtain
Very little offer calculation basis.
In step 3, the minimum-depth L of water-stop curtain is determined according to following formula:
Wherein, h is water-stop curtain two sides head difference, and t is the length that water-stop curtain designs level of ground water beyond landfill area,
γ ' is the buoyant weight degree of soil, γwFor the bulk density of water, FsFor safety coefficient.
Using above-mentioned formula, available water-stop curtain meets the minimum-depth of safety requirements, before meeting technical indicator
It puts, most economical arrangement and method for construction.
In step 4, using numerical simulation, the long-term change between the seepage discharge and level of ground water of the landfill yard foundation pit is obtained
Law.
The calculated result and its effect for the simplified calculation method taken when design, are compared with result of finite element,
After being modified, more accurate data can be obtained, improve the reasonability and reliability of Groundwater Control system.
The invention has the benefit that
Embankment is most important building structure object in plain type landfill yard, makes an investment in fully invested and occupies comparable ratio
Example selects reasonable embankment form significant to project cost is reduced.
Using high pressure jet grouting as water-stop curtain, the structure type of reasonable selection water-stop curtain, it is possible to reduce sealing
The section of curtain substantially reduces project cost while meeting engineering stability and security requirement.
The relevant parameter for determining water-stop curtain can be used as manufacture bases, guiding construction.
Chronically launching analysis is carried out for the water-stop curtain of design, to mention water-stop curtain as permanent technical measures
For theoretical foundation and technical support.
Detailed description of the invention
Fig. 1；Water-stop curtain construction plan；
Fig. 2: water-stop curtain construction cross-section diagram.
Wherein, 1. embankment, 2. water-stop curtains, 3. high-pressure slip-castings influence line.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Certain landfill yard takes up an area 414.75 mu (closing 27.65 ten thousand m3), designs 507.08 ten thousand stere of storage capacity, and this area is in Huang
River alluvial plain, level of ground water is higher, and the underground water buried depth of wet season is about 0.5m, while geology soil condition is poor, if ground
It is ineffective to be lauched water level control, cutting depth, stability of slope, earthwork balance design will be caused to teach big influence.It is filled out simultaneously in view of this
Buried district area is larger, and partial region needs the long period vacant, if there is underground water intrusion, can harm leakage preventing structure safety and antiseepage
Sanitary landfills design requirement is not achieved in the performance of material, and there are larger hidden dangers.So the control and design of underground water are this engineerings
Build the difficult point and emphasis of success or failure.
A kind of determination method of refuse landfill Groundwater Control System Halt water curtain, comprising the following steps:
Step 1: determining that dam type is dike structure form.
Embankment 1 is most important construction of structures in plain type landfill yard, makes an investment in fully invested and occupies comparable ratio
Example selects reasonable embankment pattern significant to project cost is reduced.
By technical economic analysis, design determines that embankment 1 uses and rolls native stone embankment.The advantages of compaction type soil stone embankment is
Construction is simple, lower to geological conditions requirement, although dam body is larger, operating expenses is low, can substantially reduce project cost.
In order to select reasonable form of fracture, analysis ratio has been carried out to different Load Combinations using a variety of calculation methods
Compared with.According to the technological requirements, 1 top width 10m of ring field embankment is determined, it is 8m that a phase and second phase, which separate levee crown width,.It is provided according to geological mapping
Material, site clearing the is after 1. layer ploughs soil, the 2. layer powder soil horizon be supporting course, inside and outside side slope is all made of 1:2.It is contacted with junk-heap body
Side slope use horizontal leakage preventing structure, sky side slope combination place gutter is faced in outside, using arch grassed slope.
The mainly the 2. 3. layer clay and the of layer silt, the smooth in conjunction with the clear base in landfill yard reservoir area, that this engineering excavation goes out
4. layer silt, can be used as banking material, so dam configuration is all made of compaction type soil homogeneous earth embankment.
Step 2: carrying out the relevant design of water-stop curtain 2, determine the structure type of water-stop curtain 2.
According to this place plane characteristic, through comprehensive than choosing, using jet grouting.This method is using drilling machine band
There is the Grouting Pipe of special nozzle to creep into the predetermined position of soil layer, pumped with high-voltage pulse, cement grout is passed through into drilling rod lower end
Injection apparatus, spray into the soil body around with high speed is horizontal, cut soil layer by the impact force of fluid, make the soil body in jet flow range
It wrecks, drilling rod one side is rotated at the same time with certain speed (20r/min), and a face low speed (15~30cm/min) is slowly
It is promoted, is thoroughly mixed the soil body with cement slurry, formation diameter is relatively uniform i.e. in ground after cementing hardening, has certain
The curtain of intensity (0.5~8.0MPa).To form velatively waterproof layer, reaches reduction infiltration energy, reduce amount of seepage
Effect.
It reduces cement consumption compared to conventional whirl spraying structure using single directional swing spray structure type and engineering is effectively reduced
Cost
Step 3: determining the relevant parameter of water-stop curtain 2, draft the size of water-stop curtain 2.
According to the checking computations of landfill area's slope foot side by-pass flow soil condition, the depth of water-stop curtain 2 is determined.
Soil property is based on silt in depth bounds, so calculating the hydraulic slope i at landfill area's slope foot, should be less than critical
Hydraulic slope, it may be assumed that
imax=h/ (h+2t)≤γ '/(Fsγw)
In formula: imax- landfill area's slope foot maximum hydraulic slope；
H-water-stop curtain two sides head difference, m, this place are 7.5m；
Length of the t-water-stop curtain beyond landfill area design level of ground water, m；
The buoyant unit weight of γ '-soil, (KN/m3), this place takes 9KN/m3)；
γwThe bulk density of-water, (KN/m3), this place takes 10KN/m3)；
FS- safety coefficient, 1.5~2.0, this place takes 2；
Calculate to obtain t=5.625m, i.e. 2 depth L=h+t >=7.5+5.625=13.125m of water-stop curtain.
According to report of engineering geological exploration, as 2 average length 13.125m of water-stop curtain, 6. curtain end is located in
On layer silt；Its lower 1m or so is the 7. layer silty clay, and according to 2 design feature of water-stop curtain, water-stop curtain 2 preferably protrudes into viscous
Property 1~2m of soil layer, can be effectively formed closing sealing system, improve water-stagnating effect.Design select water-stop curtain 2 length be
15m, design requirement end protrude into the 7. layer silty clay be not less than 1m.
Design uses swaying-jet-grouting method construction technology, and design effective length is not less than 0.5m, pitch-row 0.75m, along 1 center of embankment
Line arrangement, part (at Leachate site winding shaft) extension, high-pressure slip-casting influences line 3 as shown in Figure 1, first stage of the project designs hole location 2301
It is a, 2 length of water-stop curtain, 1767 linear meter(lin.m.)；The infiltration coefficient of water-stop curtain 2 should be less than 1x10-6cm/s.
Position and the working condition for optimizing water-stop curtain 2 in design process propose on the basis of improving calculating analysis
The thinking of " reduction force structure property, prominent antiseepage function ".
Step 4: chronically launching analysis is carried out using numerical simulation.
According to landfill yard first stage of the project embodiment, the typical section of excavation of foundation pit is selected, using numerical computation method, is borrowed
Existing general finite element analysis software MIDAS/GTS is helped, the Analysis of Ground-water Seepage Field of landfill area is calculated, inquires into Seepage of Foundation Pit amount,
The infiltration gradient for analyzing water-stop curtain 2, soil mass of foundation pit, evaluates its seepage-resisting stability.
In the steady seepage phase, the boundary types of Analysis of The Seepage mainly have known head boundary, go out to seep boundary and impermeable waterside
Three kinds of boundary:
1) head boundary known to: for model left border, corresponding node head is the underground water under given working condition
Position；
2) go out to seep boundary: including 1 inner slope of foundation pit top surface and embankment；
3) impervious boundary: including on the left of model in addition to given level of ground water segment boundary, model right side boundary with
And model top, bottom surface.
According to research purpose and the requirement of calculating task book, drafts following numerical procedure and carries out calculating analysis:
1) scheme one: Seepage of Foundation Pit field dimensional Finite Element when level of ground water 21.0m；
2) scheme two: the foundation pit steady seepage amount under the conditions of different levels of ground water calculates, and considers WATER LEVEL CHANGES range
For 23.0~18.0m (interval 0.5m)；
3) scheme three: k is taken1=3 × 10-5Cm/s, k21 × 10 is taken respectively-6cm/s、5×10-7cm/s、1×10-7cm/s、
0cm/s (waterproof), research 2 infiltration coefficient of water-stop curtain change the influence to Seepage of Foundation Pit amount, consider WATER LEVEL CHANGES model
Enclose 23.0~18.0m (interval 0.5m)；
4) scheme four: k is taken2=1 × 10-6Cm/s, k14.167 × 10 are taken respectively-4cm/s、1×10-4cm/s、3×10- 5cm/s、1×10-5Cm/s, the comprehensive infiltration coefficient of the research soil body change the influence to Seepage of Foundation Pit amount, consider WATER LEVEL CHANGES
23.0~18.0m of range (interval 0.5m).
According to the numerical simulation result of each scheme, the long-term change between the seepage discharge and level of ground water of landfill yard foundation pit is obtained
Law.Wherein, Seepage of Foundation Pit amount when different levels of ground water and infiltration gradient are as described in Table 1.It takes the seepage field of stationary phase, seep
The calculated result of stream gradient and seepage discharge is verified and is commented to each technical solution as the calculated result of Long-Term Simulations
Valence.
Seepage of Foundation Pit amount and infiltration gradient when 1 difference level of ground water of table
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (1)
1. a kind of determination method of refuse landfill Groundwater Control System Halt water curtain, which is characterized in that including following step
It is rapid:
Step 1: determining dike structure form and dam body section；
Step 2: using jet grouting as water-stop curtain, the water-stop curtain uses single directional swing spray structure shape
Formula；
Step 3: determining the relevant parameter of water-stop curtain, draft the size of water-stop curtain；
Step 4: according to the relevant parameter of the water-stop curtain and the size drafted, long-term underground moisture being carried out using numerical simulation
Analysis, obtains the long term variations between the seepage discharge and level of ground water of the landfill yard foundation pit；
In the step 1, the embankment uses and rolls native stone embankment；
In the step 3, the relevant parameter includes the infiltration coefficient of water-stop curtain, and the size includes the depth of water-stop curtain
Degree, the quantity of cloth hole, cloth hole effective depth and pitch-row；
Specifically, determining the depth L of water-stop curtain according to following formula:
Wherein, h is the buoyant weight degree that water-stop curtain two sides head difference γ ' is soil, γwFor the bulk density of water, Fs is safety coefficient；
In the step 4, the calculated result and its effect of the simplified calculation method that when design takes, with result of finite element into
Row compares, and after being modified, obtains more accurate data, improves the reasonability and reliability of Groundwater Control system.
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| DE3034746C2 (en) * | 1980-09-15 | 1983-12-08 | Gkn Keller Gmbh, 6050 Offenbach | Method and device for producing groundwater passages in sealing walls |
| CN101775810A (en) * | 2010-02-04 | 2010-07-14 | 天津大学 | Underground water control construction method in foundation pit dewatering project |
| CN102817370A (en) * | 2012-08-13 | 2012-12-12 | 中国矿业大学 | Positive pressure and negative pressure combined grouting method |
| CN203475453U (en) * | 2013-08-28 | 2014-03-12 | 中交二公局第一工程有限公司 | Deeply-buried type bearing platform curtain structure of bridge |
| CN103967015B (en) * | 2014-05-21 | 2016-04-27 | 刘绍国 | A kind of water seal for deep foundation pit excavation method and structure thereof |
| CN104727289B (en) * | 2015-01-28 | 2016-08-17 | 中铁十六局集团北京轨道交通工程建设有限公司 | A kind of construction method controlling multi-layered aquifer leakage-releasing water protection surrounding |
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