CN107844629A - A kind of computational methods of embedded vertical isolation barrier design thickness - Google Patents
A kind of computational methods of embedded vertical isolation barrier design thickness Download PDFInfo
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Abstract
The invention discloses a kind of computational methods of embedded vertical isolation barrier design thickness, the computational methods comprise the following steps：Determine the design service phase and breakdown standard of embedded vertical isolation barrier；According to the material type of embedded vertical isolation barrier, the infiltration coefficient and effective diffusion cofficient of embedded vertical isolation barrier are determined；The design thickness of embedded vertical isolation barrier can be directly calculated using corresponding calculation formula afterwards.It is an advantage of the invention that：The design thickness computational methods of embedded vertical isolation barrier are easy to be quick, by determining that it designs service phase and breakdown standard, you can calculate corresponding isolation barrier thickness, and result of calculation is accurate.
Description
Technical field
The invention belongs to environmental geotechnical technical field, and in particular to a kind of embedded vertical isolation barrier design thickness
Computational methods.
Background technology
The development of modern industry greatly advances the process of Development of Human Civilization, people is being enjoyed industrial civilization creation
Plentiful and substantial fruit while, also suffered from thing followed environmental pollution damage.With industry and the aggravation and agriculture of municipal pollution
With the increase of chemical classes, quantity, the pollution getting worse in soil.In terms of cost, duration and regulation effect
Advantage, isolation closing method are increasingly used in the repairing and treating of contaminated site.Isolation sealing technique mainly utilizes work
Journey measure seals pollutant in situ up for safekeeping, cuts off route of exposure, limits contaminant transportation, reduces or eliminate the exposure wind of pollutant
Danger, protection acceptor safety.Wherein, vertical barrier is one of isolation most important part of sealing technique, general to utilize stirring
Apparatus is by curing agent（The materials such as cement, lime）Soft layer deep is sprayed into, in the presence of water, is sent out between curing agent and the soil body
Raw a series of physical chemical reaction, forms complete hypotonicity cut-pff wall.
When pollutant with current by isolation barrier when, due to mechanical detention, ionic adsorption and exchange, chemical reaction etc.
Effect, pollutant will be decelerated, be trapped in isolation barrier, pollutant concentration in underground water is changed.Embedded isolation
Barrier means that isolation barrier has inserted relative water resisting layer, and now the insertion depth of isolation barrier typically results in guarantee, this after
The military service validity of off screen barrier is determined by whether pollutant punctures the isolation barrier, that is to say, that the design of vertical barrier is most closed
It is vertical barrier design thickness H determination in place of key.
However, because relation technological researching falls behind development abroad many decades, the current country there is no the vertical barrier of maturation to set
Meter method and technology, mainly use for reference the empirical equation of hydraulic engineering, i.e., will safety to allow hydraulic gradient as control condition
Coefficient is considered in hydraulic gradient is allowed.In Practical Project, the design method may make it that result is relatively dangerous, therefore have
Necessity proposes the isolation barrier design and calculation method suitable for contaminant transportation mechanism.
The content 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 embedded vertical isolation barrier is set
The computational methods of thickness are counted, the computational methods are marked by the design service phase T and breakdown for determining embedded vertical isolation barrier
Quasi- Cs, and the coefficient of permeability K e and effective diffusion cofficient De of embedded vertical isolation barrier are obtained, so as to according to corresponding meter
Calculate formula and calculate the design thickness for obtaining embedded vertical isolation barrier.
The object of the invention is realized and completed by following technical scheme：
A kind of computational methods of embedded vertical isolation barrier design thickness, the embedded vertical isolation barrier bottom are inserted into
Relative water resisting layer in the soil body, it is characterised in that the computational methods comprise the following steps：
（1）The design service phase T and breakdown standard Cs, the breakdown standard for determining the embedded vertical isolation barrier refer to
The pollutant concentration threshold value of the embedded vertical isolation barrier lateral wall；
（2）According to the material type of the embedded vertical isolation barrier, the infiltration of the embedded vertical isolation barrier is determined
COEFFICIENT K e and effective diffusion cofficient De；
（3）If the local penetration COEFFICIENT K e of the embedded vertical isolation barrier is more than threshold value, seepage flow and diffusion are considered,
Utilize calculation formula C=0.5C0Erfc (Y) calculates intermediate quantity Y value, and makes C=Cs therein；
After intermediate quantity Y value is obtained, the design thickness H of the embedded vertical isolation barrier is calculated, calculation formula is：
If the coefficient of permeability K e of the embedded vertical isolation barrier is less than threshold value, does not consider seepage effect, utilize calculating
Formula C=C0Erfc (Y) calculates intermediate quantity Y value；After intermediate quantity Y value is obtained, the embedded vertical isolation barrier is calculated
Design thickness H, calculation formula are：
In above-mentioned formula：
C be the embedded vertical isolation barrier lateral wall pollutant concentration, unit mol/L；
Cs be the embedded vertical isolation barrier lateral wall breakdown standard, unit mol/L；
C0For the pollutant concentration of liquid phase in soil body hole in the embedded vertical isolation barrier isolation range, the pollutant
Concentration has differences in the depth bounds of the embedded vertical isolation barrier, takes the maximum of the pollutant concentration, single
Position is mol/L；
Erfc is complementary error function, erfc (Y)=1-erf (Y),；
De is effective diffusion cofficient of the pollutant in the embedded vertical isolation barrier, unit Wei ㎡/year；
T is the design service phase of the embedded vertical isolation barrier, and unit is year；
vxFor the percolation flow velocity on the embedded vertical isolation barrier direction, unit m/s.
The percolation flow velocity vxCalculation formula be：
Wherein：
Ke be on the embedded vertical isolation barrier direction soil body infiltration coefficient, unit cm/s；
neFor the effecive porosity of the soil body；
I is the hydraulic gradient in the soil body.
The step（1）In, the breakdown standard Cs is the 10% of pollutant initial concentration value.
The step（3）In, the coefficient of permeability K e of embedded vertical isolation barrier threshold value is 10-7cm/s。
It is an advantage of the invention that：The design thickness computational methods of embedded vertical isolation barrier are easy to be quick, pass through determination
It designs service phase and breakdown standard, you can calculates corresponding isolation barrier thickness, and result of calculation is accurate.
Brief description of the drawings
Fig. 1 is the schematic diagram that embedded vertical isolation barrier is arranged at contaminated site periphery in the present invention.
Embodiment
The feature of the present invention and other correlated characteristics are described in further detail by embodiment below in conjunction with accompanying drawing, with
It is easy to the understanding of technical staff of the same trade：
Such as Fig. 1, mark 1-2 is respectively in figure：Embedded vertical isolation barrier 1, relative water resisting layer 2.
Embodiment：As shown in figure 1, the present embodiment is specifically related to a kind of calculating of embedded vertical isolation barrier design thickness
Method, the embedded vertical isolation barrier 1 are arranged at the periphery of contaminated site, for pollutant to be slowed down, is detained wherein, and
The bottom of embedded vertical isolation barrier 1 plugs the relative water resisting layer 2 into the soil body, now embedded vertical isolation barrier 1
Insertion depth can prevent pollutant from its bottom around spilling out, therefore, the military service validity of embedded vertical isolation barrier 1 by
Whether pollutant punctures the determination of its body, and the circular of the design thickness of embedded vertical isolation barrier 1 is including following
Step：
（1）The design service phase T and breakdown standard Cs of embedded vertical isolation barrier 1 are determined, when embedded vertical isolation screen
When hindering 1 outside pollutant concentration and reaching breakdown standard Cs, embedded vertical isolation barrier 1 is can determine that, breakdown standard Cs herein
The pollutant concentration for specifically referring to the embedded lateral wall of vertical isolation barrier 1 reaches default pollutant concentration threshold value（mol/
L）, the pollutant concentration threshold value can be by specific pollutant catabolic gene value（Risk control value or related specifications standard）Or contaminated site
The 10% of interior pollutant initial concentration carries out value；
（2）According to the material type of embedded vertical isolation barrier 1, at the same according to engineering experience or correlation test data,
Determine the coefficient of permeability K e and effective diffusion cofficient De of embedded vertical isolation barrier 1；
（3）According to foregoing breakdown standard Cs, intermediate quantity Y and design thickness H is calculated by calculation formula, particularly may be divided into
Lower two kinds of situations：
A. if the coefficient of permeability K e of embedded vertical isolation barrier 1 is less than threshold value 10-7During cm/s, then show pollutant in insertion
Seepage flow activity in formula vertical isolation barrier 1 less can not consider seepage effect, calculate intermediate quantity Y value according to the following formula：
C=C0erfc(Y)
After acquisition intermediate quantity Y value is calculated, the design thickness H of embedded vertical isolation barrier 1 is calculated, calculation formula is：
If the coefficient of permeability K e that local location in embedded vertical isolation barrier 1 b. be present is more than threshold value 10-7Cm/s situation
When, using this locally be used as worst situation, pollutant can the local location occur seepage flow activity, therefore consider seepage flow and
The influence of diffusion, intermediate quantity Y value is calculated according to the following formula：
C=0.5C0erfc(Y)
After acquisition intermediate quantity Y value is calculated, the design thickness H of embedded vertical isolation barrier 1 is calculated, calculation formula is：
In above-mentioned calculating formula：
C be the embedded lateral wall of vertical isolation barrier 1 pollutant concentration, unit mol/L；
Cs is the breakdown standard of the embedded lateral wall of vertical isolation barrier 1, unit mol/L, C=Cs in the present embodiment；
C0For the pollutant concentration of liquid phase in soil body hole in the embedded isolation range of vertical isolation barrier 1, work as pollutant concentration
When being had differences in the depth bounds along embedded vertical isolation barrier 1, the maximum of pollutant concentration, unit mol/ are taken
L；
Erfc is complementary error function, erfc (Y)=1-erf (Y),；
De is effective diffusion cofficient of the pollutant in embedded vertical isolation barrier 1, unit Wei ㎡/year；
T is the design service phase of embedded vertical isolation barrier 1, and unit is year；
vxFor the percolation flow velocity on the embedded direction of vertical isolation barrier 1, unit m/s.
Percolation flow velocity vxCalculation formula be：
Wherein：
Ke be on the embedded direction of vertical isolation barrier 1 soil body infiltration coefficient, unit cm/s；
neFor the effecive porosity of the soil body；
I is the hydraulic gradient in the soil body.
As shown in figure 1, the present embodiment step（3）In each calculation formula design calculate based on one-dimensional advection and dispersion parse
Solution, embedded vertical isolation barrier 1 meet following hypothesis in the design process：
（a）The material of embedded vertical isolation barrier 1 is homogeneous, saturation；
（b）Solid phase and liquid phase volume are incompressible in embedded vertical isolation barrier 1；
（c）Seepage flow of the contaminant fluid in embedded vertical isolation barrier 1 obeys Darcy laws, and infiltration coefficient is constant；
（d）Embedded vertical isolation barrier 1 medially descends water pollutant concentration C0It is constant in transition process；
（e）Migration of the pollutant in embedded vertical isolation barrier 1 only occurs in a direction.
Specific derivation is as follows：
（One）The foundation of fundamental equation：
In formula：
RfFor block characteristics, dimensionless；
In the case where embedded vertical isolation barrier 1 is complete, uniform in material, seepage effect is ignored, this equation is not
Consider the One-dimensional Diffusion Equation of seepage flow, above formula is further simplified as：
In formula：
D0For apparent diffusion coefficient of the pollutant in embedded vertical isolation barrier 1（㎡/year）, ignore block characteristics, then D0=
De；
（Two）Boundary condition is assumed
The solution of diffusion equation depends on primary condition and boundary condition.Boundary condition must be applied to embedded vertical isolation barrier
The entrance of 1 system（x=0）With the outlet of the embedded system of vertical isolation barrier 1（x=H）.It is assumed that：1. the soil body is semo-infinite；
2. the soil body starts not contaminated；3. pollution sources concentration is constant, then it is normally set up with downstream condition：
；
；
。
（Three）Design formula is established
According to above governing equation and boundary condition, it is as follows to can obtain analytic solutions：
z1、z2、z3It is defined as follows：
、、
Ignore block characteristics, and when not considering seepage effect, above formula can be reduced to C=C0erfc(Y)；And when consideration seepage flow is made
Used time,It can ignore, above formula can be reduced to C=0.5C0erfc(Y)。
The beneficial effect of the present embodiment is：（1）The design thickness computational methods of embedded vertical isolation barrier are easy to be fast
Speed, by determining that it designs service phase and breakdown standard, you can corresponding isolation barrier thickness, and result of calculation is accurate；
（2）Current existing design method is generally basede on hydraulic gradient and calculated, more common higher in isolation barrier both sides head difference
Situation, similar embodiment such case, then can not quantitative design, while do not consider that the diffusion mechanism of pollutant is existing design
The deficiency of method.
Embodiment 2：As shown in figure 1, the present embodiment is specifically related to a kind of meter of embedded vertical isolation barrier design thickness
Calculation method, and illustrated with reference to instantiation, certain plot is located at Shanghai City, and place subregion soil and groundwater is by more
Kind Organic Pollution, water and soil joint need to be implemented and repaired, mainly take extracting mode to carry out groundwater remediation.With reference to field condition,
For the sedimentation of drawn water in control place caused place periphery structures, pipeline, in place east side, enclosure wall sets embedded vertical
Isolation barrier 1, and calculated according to the computational methods of the embedded design thickness of vertical isolation barrier 1 in embodiment 1：
（1）The design service phase T for determining embedded vertical isolation barrier 1 is 30 years, and determines that it punctures standard Cs, the breakdown mark
Quasi- Cs is：The lateral wall of embedded vertical isolation barrier 1 can reach the 10% of pollutant concentration initial value；
（2）According to the material type of embedded vertical isolation barrier 1, at the same according to engineering experience or correlation test data,
The effective diffusion cofficient De for determining embedded vertical isolation barrier 1 is 4.0E-11m2/s；
（3）In the case where not considering seepage effect, calculating formula C=C is utilized0Erfc (Y) andCalculate insertion
The design thickness of formula vertical isolation barrier 1, calculate design thickness H is 0.48m.
Claims (4)
1. a kind of computational methods of embedded vertical isolation barrier design thickness, the embedded vertical isolation barrier bottom insertion
Relative water resisting layer into the soil body, it is characterised in that the computational methods comprise the following steps：
（1）The design service phase T and breakdown standard Cs, the breakdown standard for determining the embedded vertical isolation barrier refer to
The pollutant concentration threshold value of the embedded vertical isolation barrier lateral wall；
（2）According to the material type of the embedded vertical isolation barrier, the infiltration of the embedded vertical isolation barrier is determined
COEFFICIENT K e and effective diffusion cofficient De；
（3）If the local penetration COEFFICIENT K e of the embedded vertical isolation barrier is more than threshold value, seepage flow and diffusion are considered,
Utilize calculation formula C=0.5C0Erfc (Y) calculates intermediate quantity Y value, and makes C=Cs therein；
After intermediate quantity Y value is obtained, the design thickness H of the embedded vertical isolation barrier is calculated, calculation formula is：
If the coefficient of permeability K e of the embedded vertical isolation barrier is less than threshold value, does not consider seepage effect, utilize calculating
Formula C=C0Erfc (Y) calculates intermediate quantity Y value；After intermediate quantity Y value is obtained, the embedded vertical isolation barrier is calculated
Design thickness H, calculation formula are：
In above-mentioned formula：
C be the embedded vertical isolation barrier lateral wall pollutant concentration, unit mol/L；
Cs be the embedded vertical isolation barrier lateral wall breakdown standard, unit mol/L；
C0For the pollutant concentration of liquid phase in soil body hole in the embedded vertical isolation barrier isolation range, the pollutant
Concentration has differences in the depth bounds of the embedded vertical isolation barrier, takes the maximum of the pollutant concentration, single
Position is mol/L；
Erfc is complementary error function, erfc (Y)=1-erf (Y),；
De is effective diffusion cofficient of the pollutant in the embedded vertical isolation barrier, unit Wei ㎡/year；
T is the design service phase of the embedded vertical isolation barrier, and unit is year；
vxFor the percolation flow velocity on the embedded vertical isolation barrier direction, unit m/s.
A kind of 2. computational methods of embedded vertical isolation barrier design thickness according to claim 1, it is characterised in that
The percolation flow velocity vxCalculation formula be：
Wherein：
Ke be on the embedded vertical isolation barrier direction soil body infiltration coefficient, unit cm/s；
neFor the effecive porosity of the soil body；
I is the hydraulic gradient in the soil body.
A kind of 3. computational methods of embedded vertical isolation barrier design thickness according to claim 1, it is characterised in that
The step（1）In, the breakdown standard Cs is the 10% of pollutant initial concentration value.
A kind of 4. computational methods of embedded vertical isolation barrier design thickness according to claim 1, it is characterised in that
The step（3）In, the coefficient of permeability K e of embedded vertical isolation barrier threshold value is 10-7cm/s。
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963571A (en) * | 2010-09-21 | 2011-02-02 | 同济大学 | Indoor detection method for treatment effect of cement soil barrier isolation method |
| CN106320385A (en) * | 2016-10-17 | 2017-01-11 | 天津中联格林科技发展有限公司 | Vertical anti-seepage barrier and construction method thereof |
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2017
- 2017-09-27 CN CN201710887234.6A patent/CN107844629A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101963571A (en) * | 2010-09-21 | 2011-02-02 | 同济大学 | Indoor detection method for treatment effect of cement soil barrier isolation method |
| CN106320385A (en) * | 2016-10-17 | 2017-01-11 | 天津中联格林科技发展有限公司 | Vertical anti-seepage barrier and construction method thereof |
Non-Patent Citations (2)
| Title |
|---|
| AKIO OGATA AND R.B. BANKS: "A Solution of the Differential Equation of Longitudinal Dispersion in Porous Media", 《USGS PROFESSIONAL PAPER》 * |
| 席永慧 等: "迁移机理下污染物场地隔离屏障的设计研究", 《结构工程师》 * |
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