CN110397089A - A kind of setting method of the multiple vertical isolation barrier of contaminated site - Google Patents
A kind of setting method of the multiple vertical isolation barrier of contaminated site Download PDFInfo
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- PBKONEOXTCPAFI-UHFFFAOYSA-N 1,2,4-trichlorobenzene Chemical class ClC1=CC=C(Cl)C(Cl)=C1 PBKONEOXTCPAFI-UHFFFAOYSA-N 0.000 description 1
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Abstract
The invention discloses a kind of setting methods of the multiple vertical isolation barrier of contaminated site, the following steps are included: delimiting the boundary of contaminated site and detecting acquisition pollution parameters, simplify according to pollution parameters and one-dimensional advection dispersion model and calculate the first minimum thickness for obtaining the vertical isolation barrier of internal layer, and the vertical isolation barrier of internal layer is arranged according to the first minimum thickness；It is carried out calculating the second minimum thickness for obtaining the vertical isolation barrier of outer layer according to pollution parameters and Dupuit's equation, the width that the buffer area between the vertical isolation barrier of outer layer and the vertical isolation barrier of internal layer delimited according to the geology distribution around contaminated site, arranges the vertical isolation barrier of outer layer according to the second minimum thickness and width.The invention has the advantages that the seepage effect, dispersion and suction-operated of pollutant are distinguish, improve the Years Of Service of isolation barrier, it can also overcome and bring influence is changed on hydraulic boundary conditions such as rainfall, evaporations, enhance the isolation effect of isolation barrier.
Description
Technical field
The invention belongs to land pollution Treatment process fields, and in particular to a kind of multiple vertical isolation barrier of contaminated site
Setting method.
Background technique
Isolation technology is polluted, refers to the approach for blocking pollutant migration and diffusion in soil media by being laid with barrier layer, makes
Pollution medium is isolated with ambient enviroment, avoids pollution object and human contact and with precipitation or underground water migration and then to human body and week
The technology that collarette border causes damages.The nineties in last century year starts, and vertical isolation method at home and abroad obtains higher concern, but
The application of contaminated site vertical divider technology at home still belongs to the starting stage, and correlation engineering example is still less.
By the practice and exploring of many years, soil-bentonite cut-pff wall, plastic concrete cut-off wall, cement-bentonite antiseepage
Wall (self-hardening slurry), geomembrane-bentonite slurry compound impervious wall, normal concrete cut-pff wall, Soil-cement piling wall, grouting
The isolated forms such as curtain, steel sheet pile cut-pff wall are gradually applied in the barrier of the risk of refuse landfill and contaminated site.It is different
The isolation barrier of form in economy, can respectively play advantage in terms of application property, long service.
In terms of design method, although isolation barrier is increasingly being applied in pollution control and prevention and cure project,
Its design concept but fails always to reach unification, and domestic and foreign scholars have carried out deeply for vertical isolation barrier and widely ground
Study carefully, obtain more achievement, but also exposes certain problem.On the one hand, current research is more for vertical
The isolated material of barrier, construction technology, repairs emergency measure etc. at design method, to the design and construction shape of isolation barrier
The research relative deficiency of formula.On the other hand, the contradiction of isolation barrier short run effect and long service performance is difficult to coordinate, and excessively manages
The design for wanting has ignored the change of hydraulic boundary conditions caused by rainfall, evaporation etc..
Summary of the invention
According to the deficiencies of the prior art described above, It is an object of the present invention to provide a kind of multiple vertical isolation of contaminated site
The setting method of barrier enhances the isolation effect of vertical barrier by two layers of vertical isolation barrier of setting and buffer area.
The object of the invention realization is completed by following technical scheme:
A kind of setting method of the multiple vertical isolation barrier of contaminated site, which comprises the following steps:
Step 1: delimiting the boundary of the contaminated site, the contaminated site detect to obtain pollution parameters；
Step 2: being carried out simplifying the calculating acquisition vertical isolation barrier of internal layer according to the pollution parameters and one-dimensional advection dispersion model
The first minimum thickness, and the vertical isolation barrier of internal layer is arranged according to first minimum thickness；
Step 3: being carried out calculating the second minimum for obtaining the vertical isolation barrier of outer layer according to the pollution parameters and Dupuit's equation
Thickness；
Step 4: the vertical isolation barrier of outer layer being delimited according to the geology distribution around the contaminated site and the internal layer is perpendicular
To the width of the buffer area between isolation barrier, arrange that the outer layer is vertical according to second minimum thickness and the width
Isolation barrier.
The pollution parameters include pollution depth, the vertical isolation barrier of outer layer and the vertical isolation barrier of the internal layer
Depth of placement is not less than the pollution depth.
The pollution parameters include pollution type, and the pollution type is divided into volatile contaminant and non-volatile pollution, right
Belonging on the contaminated site of the volatile contaminant there also is provided horizontal isolation barrier.
Simplify the simplified formula calculated in the step 2 are as follows:Wherein, x is described the
One minimum thickness, unit m；T is the Years Of Service of the vertical isolation barrier of the internal layer, unit year；DeFor pollutant
Effective diffusion cofficient, unit m2/year；RdFor block characteristics, dimensionless；C0For in the contaminated site pollutant it is initial
Concentration, unit mg/L；C is the real-time concentration of pollutant in the contaminated site, unit mg/L；The pollution parameters include
De、Rd、C0；The Years Of Service is set according to isolation requirement in the step 2 and sets C/C0=0.1, substitute into the simplification
First minimum thickness is obtained after formula.
In the step 3, according to formulaIt calculates and obtains second minimum thickness, wherein h0For institute
State head on the inside of the vertical isolation barrier of outer layer, unit m；H is head on the outside of the vertical isolation barrier of the outer layer, unit m；k
For the infiltration coefficient of the vertical isolation barrier material of the outer layer, unit cm/s；L is second minimum thickness, unit m；
R is that the precipitation unit of the contaminated site region is m/d；A is the gross area of the contaminated site, unit m2；D
For the perimeter of the contaminated site, unit m；H is by h0Head difference δ h acquisition is subtracted, the δ h is set as 3-5m, the pollution
Parameter includes h0、 k、R、A、D。
The invention has the advantages that using double-deck vertical isolation barrier and buffering based on pollutants in soil mechanism
The seepage effect, dispersion and suction-operated of pollutant are distinguish by zone scheme, improve the military service year of isolation barrier
Limit, additionally it is possible to overcome and bring influence is changed on hydraulic boundary conditions such as rainfall, evaporations, enhance the isolation effect of isolation barrier
Fruit.
Detailed description of the invention
Fig. 1 is the arragement construction schematic diagram of the multiple vertical isolation barrier of contaminated site in the embodiment of the present invention；
Fig. 2 is the partial enlarged view of the multiple vertical isolation barrier of contaminated site in the embodiment of the present invention.
Specific embodiment
Feature of the invention and other correlated characteristics are described in further detail by embodiment below in conjunction with attached drawing, with
Convenient for the understanding of technical staff of the same trade:
Such as Fig. 1-2, respectively label is respectively as follows: the vertical isolation barrier 2 of contaminated site 1, internal layer, the vertical isolation barrier 3 of outer layer, slow in figure
Rush region 4, barrier exterior domain 5.
Embodiment 1: as shown in Figs. 1-2, the present embodiment is set more particularly to a kind of multiple vertical isolation barrier of contaminated site
Method is set, by two layers of vertical isolation barrier of setting and buffer area 3, enhances the isolation effect of vertical barrier.
As shown in Figs. 1-2, the setting method of the multiple vertical isolation barrier of contaminated site in the present embodiment includes following step
It is rapid:
Step 1: delimiting the boundary of contaminated site 1, contaminated site 1 detect to obtain pollution parameters；
Step 2: simplify calculating according to pollution parameters and one-dimensional advection dispersion model and obtain the of the vertical isolation barrier 2 of internal layer
One minimum thickness, and the vertical isolation barrier 2 of internal layer is arranged according to the first minimum thickness；
Step 3: being carried out calculating the second minimum thickness for obtaining the vertical isolation barrier 3 of outer layer according to pollution parameters and Dupuit's equation
Degree；
Step 4: the vertical isolation barrier 3 of outer layer and the vertical isolation barrier 2 of internal layer delimited according to the geology distribution around contaminated site 1
Between buffer area 4 width, the vertical isolation barrier 3 of outer layer is arranged according to the second minimum thickness and width.
As shown in Figs. 1-2, in the present embodiment, it is vertical twice can be set up in the periphery of contaminated site 1 through the above steps
Isolation barrier: it is located between buffer area 4 and barrier exterior domain 5 together, plays a part of " antiseepage ", prevent buffer area 4
Water level rapid decrease or rising, the vertical isolation barrier 3 of outer layer require infiltration coefficient more stringent；Another road is located at buffer area
Between domain 4 and contaminated site 1, play a part of " antifouling ", pollutant prevented slowly to infiltrate through buffer area 4, internal layer vertically every
Off screen hinders 2 pairs of diffusion coefficients and the requirement of absorption property is more stringent.Under conditions of rationally control head, by pair of pollutant
Stream, diffusion are obstructed respectively.Significant head difference, the migration master of pollutant is not present in buffer area 4 and contaminated site 1
To rely on diffusion, then there is significant head difference in buffer area 4 and barrier exterior domain 5, but due to pollutant do not migrate to
Buffer area, there is only convection current (seepage flow) effects.
In the present embodiment, due to the protective action of two layers of vertical isolation barrier, the pollution of below ground can be effective
Isolation, it is and more than ground that volatilizable pollution is isolated by the horizontal isolation barrier of setting.Before horizontal isolation barrier is set
Need to determine whether according to pollution type to carry out the isolation of horizontal plane.Pollution parameters include pollution type, and pollution type, which is divided into, waves
Contact scar and non-volatile pollution are sent out, to there also is provided horizontal isolation barrier on the contaminated site 1 for belonging to volatile contaminant.With much money
The contaminated site 1 for belonging to class is not related to gaseous volatilization, and vertical isolation barrier can only be arranged.It is related to volatile contaminant, as volatility has
Machine object (VOCs), semi-volatile organic matter (SVOCs), volatile heavy metal (such as mercury) then need to be arranged and horizontally be isolated
Barrier and surface layer disposal ditches, isolation barrier is using isolated materials such as HDPE films.By dual resisteance barriers affect, buffer area 4, dirt
Dye region is relatively isolated with barrier exterior domain 5, regardless of whether taking horizontal quarantine measures, waterpower excretion, nourishment condition are basic
Remain consistent.
As shown in Figs. 1-2, in the present embodiment, the vertical isolation barrier 3 of the outer layer of setting and the vertical isolation barrier 2 of internal layer are all needed
Pollution depth is considered, thus need to detect pollution depth when detecting to contaminated site 1.Pollution
Parameter includes pollution depth, in order to guarantee the isolation effect of pollutant, the vertical isolation barrier 3 of outer layer and the vertical isolation barrier of internal layer
2 depth of placement is not less than pollution depth.
As shown in Figs. 1-2, in the present embodiment, to the calculating of the first minimum thickness of the vertical isolation barrier of internal layer 2 in step 2
It solves with the following method.Migration of the pollutant in porous media is sufficiently complex, this process contains physical process, chemistry
Process and bioprocess.Physical process is related to convection action, diffusion and dispersion, physical absorption and desorption；Chemical mistake
Journey is related to chemisorption and desorption, redox；Bioprocess is related to biochemical degradation effect etc..Exist for pollutant
Migration problem in isolation barrier is analyzed using one-dimensional convection-dispersion equation.Following condition is preset in analysis: barrier material is equal
It is matter, saturation；Solid phase and liquid phase volume are incompressible in soil；It is fixed that seepage flow of the contaminated liquid in barrier obeys Darcy
Rule, and osmotic coefficient k is constant；Migration of the pollutant in barrier only occurs in a direction.It is examined according to above-mentioned condition foundation
Consider the fundamental equation of one dimensional fluid flow, diffusion and suction-operated:
Formula 1:
Formula 2:Cs=Kd×C；
Formula 3:Dh=De+vα；
Formula 4:
In formula: KdIt is that liquid phase is dense for solid concentration (mg/kg), C that distribution coefficient (ml/g), Cs are soil or isolation barrier
Spend (mg/L), DhFor hydrodynamic dispersion coefficient (m2/ year), De be effective diffusion cofficient (m2/ year), x be migration distance
(m)、vsFor percolation flow velocity (m/s)；ρbFor dry density (g/cm3)；N is porosity；α is the spread (m)；RdFor block characteristics
(dimensionless)；T is transit time (year).
In the calculating of the vertical isolation barrier 2 of internal layer, by being solved to formula (1) and (2).The dirt contained in pollution sources
Contaminate object the vertical isolation barrier 2 of inner layer can migrate under the action of convection current, diffusion, disperse.When the effects of not considering biochemical degradation,
The concentration of pollution sources can be considered constant density, and the boundary that becomes a mandarin of the vertical isolation barrier 2 of internal layer meets condition are as follows: C (x=0, t >=
0)=C0, when pollutant does not puncture divider wall, Outlet boundary meets C (x=∞, t >=0)=0, C0For pollution sources initial concentration
(mg/L).Above-mentioned boundary condition can apply to the design and analysis of isolation barrier thickness, corresponding analytic solutions are as follows:
Formula 5:
Since under the protection of two vertical isolation barriers, the head difference of vertical 2 bilateral of isolation barrier of internal layer keeps one substantially
It causes, pollutant is leading with diffusion at this time.So that above-mentioned formula (5) can simplify when v approach 0 are as follows:
Formula 6:
The simplified formula for simplifying calculating is finally obtained according to above-mentioned derivation process:Wherein, x
It is Years Of Service (year), the D of the vertical isolation barrier 2 of internal layer for the first minimum thickness (m), teIt is for effective diffusion of pollutant
Number (m2/year)、RdFor block characteristics (dimensionless), C0Initial concentration (mg/L), C for pollutant in contaminated site 1 are dirty
The real-time concentration (mg/L) of pollutant in place 1 is contaminated, pollution parameters include De、Rd、C0；It is set and is taken according to isolation requirement in step 2
The labour time limit simultaneously sets C/C0=0.1, the first minimum thickness is obtained after substituting into simplified formula.Above-mentioned parameter is corresponding in turn to isolation barrier
The value detected in setting up procedure, that is, above-mentioned pollution parameters.
As shown in Figs. 1-2, in the present embodiment, to the calculating of the second minimum thickness of the vertical isolation barrier of outer layer 3 in step 3
It solves with the following method.The purpose of the vertical isolation barrier 3 of outer layer is to prevent 4 underground water of buffer area quick by sealing
Decline describes the discharge per unit width and infiltration coefficient, isolation barrier thickness of outer layer vertical isolation barrier 3 using Dupuit's equation
Correlativity, under formula enters:
Formula 7:In formula: h0It is that outer layer is vertically isolated for the vertical 3 inside head (m) of isolation barrier of outer layer, h
3 outside head (m) of barrier, k are the infiltration coefficient (cm/s) of vertical 3 material of isolation barrier of outer layer, L is the second minimum thickness
(m)；Q is the discharge per unit width (m of the vertical isolation barrier 3 of outer layer2/s)。
Need to control the rainfall infiltration amount and the vertical isolation barrier of outer layer of buffer area 4 under effective operating condition of isolation barrier
3 outflows keep balance, to ensure that it is too fast that 4 water level of buffer area is unlikely to decline.And the case where setting horizontal isolation barrier, cuts
The evaporation approach to have broken in contaminated site 1 ignores the influence of evaporation, the rainfall in contaminated site 1 by guide to buffer area 4,
Thus, single width of buffer area 4 becomes a mandarin flow are as follows:Wherein: QhIt becomes a mandarin flow (m for single width of buffer area 42/
S), the gross area (m that R is the precipitation (m/d) of 1 region of contaminated site, A is contaminated site 12), D be contaminated site 1
Perimeter (m).
When calculating the second minimum thickness of the vertical isolation barrier 3 of outer layer, the single width for first calculating acquisition buffer area 4 becomes a mandarin
The wide flow that becomes a mandarin of the list of buffer area 4 is substituted into formula 7 as the discharge per unit width of the vertical isolation barrier 3 of outer layer and is calculated by flow
To the second above-mentioned minimum thickness.The vertical 3 inside head of isolation barrier of outer layer is known parameters, outside the vertical isolation barrier 3 of outer layer
Side head subtracts head difference δ h by the vertical 3 inside head of isolation barrier of outer layer and obtains, and δ h presses least favorable principle, takes 3-5 meters.
Calculation formula is finally obtained according to above-mentioned derivation process:Wherein, h0For the vertical isolated screen of outer layer
Hinder 3 inside heads (m), the infiltration that h is the vertical 3 outside head (m) of isolation barrier of outer layer, k is vertical 3 material of isolation barrier of outer layer
Coefficient (cm/s), the precipitation (m/d) that L is the second minimum thickness (m), R is 1 region of contaminated site, A are contaminated site 1
The gross area (m2), D be contaminated site 1 perimeter (m).
In the present embodiment, the selected width in buffer area 4 meets buffer area and does not make in the underground water that withered rainy season flows out
The region water level acutely declines.In addition, the mode that artificial recharge can be used in 4 level of ground water rapid decrease of buffer area maintains
Water level.
The present embodiment, which has the advantages that, uses double-deck vertical isolation barrier based on pollutants in soil mechanism
With 4 scheme of buffer area, the seepage effect, dispersion and suction-operated of pollutant are distinguish, isolation barrier is improved
Years Of Service, additionally it is possible to overcome on the hydraulic boundary conditions such as rainfall, evaporation change bring influence, enhance isolation barrier every
From effect.
Embodiment 2: the present embodiment is illustrated by taking the place of Shanghai as an example, the place occupied area about 50000m2, by
Nearly 60 years industrial productions influence, and underground water is polluted by volatility DNAPLs in place.Further investigation reveals that in place in underground water
Major pollutants be Isosorbide-5-Nitrae-dichloro-benzenes, 1,2,4- trichloro-benzenes etc., sample segment times of ultra standard is up to 10000 or more, and pollutant
Volatilization causes to seriously affect to surrounding enviroment for a long time.
The place is located at the normal stratum distributed area in Shanghai, will as horizontal baffle system using HPDE film combination clay bed course
Surface layer rainfall collection, guide, using dual cement mixing method as vertical divider system, i.e. first of impervious cement-earth wall is
The vertical isolation barrier of internal layer, second impervious cement-earth wall are the vertical isolation barrier of outer layer, and the relevant parameter of isolation barrier refers to
Table 1.Its first of impervious cement-earth wall is according to the calculating formula in embodiment 1Calculated result
As shown in Table 2, consider that Years Of Service is 30 years, taking design thickness is 645mm.
1 soil layer of table and isolation barrier design parameter list
First of the impervious cement-earth wall design calculation result of table 2
| Years Of Service (year) | 5 | 10 | 30 | 50 | 100 |
| Migration distance (mm) | 415 | 585 | 645 | 840 | 1180 |
The region annual rainfall about 1000mm, according to formulaIt is about 3.17 × 10 that single wide flow that becomes a mandarin, which can be obtained,-8m2/ s, h0Taking (level of ground water to water barrier top) is 7m, and h (L) takes 4m, k to take 10-7cm/s.Then it can be calculated L according to the formula
=521mm.
By 30 years, already punctured completely according to the single layer impervious cement-earth wall of equal thickness (1166mm), but dual
Only buffer area concentration has reached 10% in isolation place, and place is under the protection of second impervious cement-earth wall still in controllable state.
The place isolation barrier is arranged inside and outside tens of mouthfuls of monitoring wells and is monitored to isolation effect, each monitoring outside isolation barrier
The groundwater level fluctuation of well is relatively large, and Groundwater bit distribution is concentrated mainly on 3.0~3.6m or so.Isolation barrier is internally
It is lauched water level elevation and is basically stable at 4.5m or so, be higher than about 1m or so outside place, water level is relatively stable with respect to outside place, place
The hydraulic connection of inside and outside underground water is weaker.
Currently, the place has been carried out the long term monitoring up to 2 years, monitoring project includes that barrier is outer and buffer area water quality
(containing pollutant concentration), SOIL GAS pollution concentration, water level etc., projects monitoring result show that place barrier system is good, risk
Controllably.
Claims (5)
1. a kind of setting method of the multiple vertical isolation barrier of contaminated site, which comprises the following steps:
Step 1: delimiting the boundary of the contaminated site, the contaminated site detect to obtain pollution parameters；
Step 2: being carried out simplifying the calculating acquisition vertical isolation barrier of internal layer according to the pollution parameters and one-dimensional advection dispersion model
The first minimum thickness, and the vertical isolation barrier of internal layer is arranged according to first minimum thickness；
Step 3: being carried out calculating the second minimum for obtaining the vertical isolation barrier of outer layer according to the pollution parameters and Dupuit's equation
Thickness；
Step 4: the vertical isolation barrier of outer layer being delimited according to the geology distribution around the contaminated site and the internal layer is perpendicular
To the width of the buffer area between isolation barrier, arrange that the outer layer is vertical according to second minimum thickness and the width
Isolation barrier.
2. a kind of setting method of the multiple vertical isolation barrier of contaminated site according to claim 1, which is characterized in that institute
Stating pollution parameters includes pollution depth, and the depth of placement of the vertical isolation barrier of outer layer and the vertical isolation barrier of the internal layer is not
Less than the pollution depth.
3. a kind of setting method of the multiple vertical isolation barrier of contaminated site according to claim 1, which is characterized in that institute
Stating pollution parameters includes pollution type, and the pollution type is divided into volatile contaminant and non-volatile pollution, to belonging to described wave
Sending out there also is provided horizontal isolation barrier on the contaminated site of contact scar.
4. a kind of setting method of the multiple vertical isolation barrier of contaminated site according to claim 1, which is characterized in that institute
It states in step 2 and simplifies the simplified formula calculated are as follows:Wherein, x is described first minimum thick
Degree, unit m；T is the Years Of Service of the vertical isolation barrier of the internal layer, unit year；DeFor effective diffusion of pollutant
Coefficient, unit m2/year；RdFor block characteristics, dimensionless；C0For the initial concentration of pollutant in the contaminated site, unit
For mg/L；C is the real-time concentration of pollutant in the contaminated site, unit mg/L；The pollution parameters include De、Rd、C0；
The Years Of Service is set according to isolation requirement in the step 2 and sets C/C0=0.1, it is obtained after substituting into the simplified formula
First minimum thickness.
5. a kind of setting method of the multiple vertical isolation barrier of contaminated site according to claim 1, which is characterized in that institute
It states in step 3, according to formulaIt calculates and obtains second minimum thickness, wherein h0It is vertical for the outer layer
Head on the inside of isolation barrier, unit m；H is head on the outside of the vertical isolation barrier of the outer layer, unit m；K is the outer layer
The infiltration coefficient of vertical isolation barrier material, unit cm/s；L is second minimum thickness, unit m；R is the pollution
The precipitation unit of place region is m/d；A is the gross area of the contaminated site, unit m2；D is the Pollution Field
The perimeter on ground, unit m；H is by h0Head difference δ h acquisition is subtracted, the δ h is set as 3-5m, and the pollution parameters include h0、k、
R、A、D。
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| CN201910495948.1A CN110397089B (en) | 2019-06-10 | 2019-06-10 | Method for setting multiple vertical isolation barriers in polluted site |
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| CN201910495948.1A CN110397089B (en) | 2019-06-10 | 2019-06-10 | Method for setting multiple vertical isolation barriers in polluted site |
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| CN110397089B CN110397089B (en) | 2020-12-08 |
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| CN116770901A (en) * | 2023-08-14 | 2023-09-19 | 水利部交通运输部国家能源局南京水利科学研究院 | Double-layer vertical partition wall structure of polluted site and active regulation and control method |
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