CN107784160A - A kind of computational methods of suspension type vertical isolation barrier projected depth - Google Patents
A kind of computational methods of suspension type vertical isolation barrier projected depth Download PDFInfo
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Abstract
The invention discloses a kind of computational methods of suspension type vertical isolation barrier projected depth, the computational methods comprise the following steps：Determine the design service phase and breakdown standard of suspension type vertical isolation barrier；According to pollution object location to the characteristic of soil layer between suspension type vertical isolation barrier bottom, the equivalent coefficient of permeability of the soil layer and equivalent hydrodynamic dispersion coefficient are determined；The projected depth of suspension type vertical isolation barrier is directly calculated using corresponding calculation formula afterwards.It is an advantage of the invention that：The projected depth computational methods of suspension type vertical isolation barrier are easy to be quick, by determining that it designs service phase and breakdown standard, you can calculate corresponding isolation barrier projected depth, and result of calculation is accurate.
Description
Technical field
The invention belongs to environmental geotechnical technical field, and in particular to a kind of suspension type vertical isolation barrier projected depth
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.
In the case of interim contact scar baffle system or relative water resisting layer relatively depth, suspension type vertical isolation barrier is often
One of important component as isolation sealing technique, general utilize stir apparatus by curing agent（The materials such as cement, lime）
Soft layer deep is sprayed into, a series of physical chemical reaction occurs in the presence of water, between curing agent and the soil body, is formed complete
Hypotonicity cut-pff wall.
When pollutant with current by vertical isolation barrier when, because mechanical detention, ionic adsorption and exchange, chemistry are anti-
Effect should be waited, pollutant will be decelerated, be trapped in vertical isolation barrier, pollutant concentration in underground water is changed.It is outstanding
Hanging vertical isolation barrier means that vertical isolation barrier is not inserted into relative water resisting layer, and the pollutant in isolation barrier may ooze
Enter deeper stratum and bypass vertical isolation barrier to external diffusion.
In engineering practice, it is vertical isolation barrier design thickness and design in place of the design most critical of vertical isolation barrier
The determination of depth, for suspension type vertical isolation barrier, because the infiltration coefficient and diffusion coefficient of soil layer are much larger than vertical
In itself, therefore the determination of projected depth seems more important to isolation barrier.
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 suspension type vertical isolation barrier is set
The computational methods of depth are counted, the computational methods are marked by the design service phase and breakdown for giving suspension type vertical isolation barrier
Standard, so as to calculate the projected depth numerical value of suspension type vertical isolation barrier.
The object of the invention is realized and completed by following technical scheme：
A kind of computational methods of suspension type vertical isolation barrier projected depth, the suspension type vertical isolation barrier bottom with it is relative
Water barrier tool is at regular intervals, 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 suspension type vertical isolation barrier refer to
The bottom of the suspension type vertical isolation barrier or the pollutant concentration threshold value of lateral wall；
（2）According to pollution object location to the characteristic of soil layer between the suspension type vertical isolation barrier bottom, the soil layer is determined
Equivalent coefficient of permeability K and equivalent hydrodynamic dispersion coefficient D；
（3）According to the breakdown standard, according to calculation formula C=0.5C0Erfc (Y) calculates intermediate quantity Y value, wherein：
C=Cs；
C is the pollutant concentration of the suspension type vertical isolation barrier bottom or lateral wall, unit mol/L；
Cs is the breakdown standard of the suspension type vertical isolation barrier bottom or lateral wall, unit mol/L；
C0The depth capacity B of pollutant when being begun one's duty for the suspension type vertical isolation barrier0Locate, liquid in Polluted Soil body opening gap
The pollutant concentration of phase, unit mol/L；
Erfc is complementary error function, erfc (Y)=1-erf (Y),；
（4）With reference to the breakdown standard, pass through calculation formulaCalculate the suspension type vertical every
Off screen hinders the projected depth B in the soil body, wherein：
D is greatest contamination depth B0The equivalent hydrodynamic force of the soil body is more between the suspension type vertical isolation barrier projected depth B
Dissipate coefficient, unit Wei ㎡/s；
T is the design service phase of the suspension type vertical isolation barrier, and unit is year；
vzFor the percolation flow velocity parallel to the suspension type vertical isolation barrier direction, unit is /s；
B0For the depth capacity of pollutant, unit m.
Parallel to the percolation flow velocity v in the suspension type vertical isolation barrier directionzCalculation formula be：
Wherein：
K is the depth capacity B of pollutant0The equivalent infiltration of the soil body between the suspension type vertical isolation barrier projected depth B
Coefficient；
neFor the effecive porosity of the soil body；
I is the hydraulic gradient in the soil body.
The breakdown standard reaches for the bottom of the suspension type vertical isolation barrier or the pollutant concentration threshold value of lateral wall
To the 10% of pollutant initial concentration value.
It is an advantage of the invention that：The projected depth computational methods of suspension type vertical isolation barrier are easy to be quick, pass through determination
It designs service phase and breakdown standard, you can calculates corresponding isolation barrier projected depth, and result of calculation is accurate.
Brief description of the drawings
Fig. 1 is the setting schematic diagram of centre mounted type vertical isolation barrier of 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 1-3 is respectively in figure：Suspension type vertical isolation barrier 1, permeable ground 2, relative water resisting layer 3.
Embodiment 1：As shown in figure 1, when pollutant with current by suspension type vertical isolation barrier 1 when, due to machinery
Detention, ionic adsorption and exchange, chemical reaction etc. act on, and pollutant will be decelerated, be trapped in suspension type vertical isolation barrier 1
In, pollutant concentration in underground water is changed.Suspension type vertical isolation barrier 1 mean isolation barrier be not inserted into it is relative every
Water layer 3, the pollutant in suspension type vertical isolation barrier 1 may penetrate into deeper stratum and bypass suspension type vertical isolated screen
Hinder 1 to external diffusion.In engineering practice, it is vertical barrier design thickness and projected depth in place of the design most critical of vertical barrier
Determination, for suspension type vertical isolation barrier 1, because the infiltration coefficient and diffusion coefficient of soil layer are much larger than vertical barrier
Itself, therefore the determination of projected depth seems more important.
As shown in figure 1, the present embodiment is specifically related to a kind of computational methods of suspension type vertical isolation barrier projected depth, lead to
Cross the setting of suspension type vertical isolation barrier 1, place be divided into inside and outside two parts of contaminated site, the computational methods include with
Lower step：
（1）Determine the design service phase T and breakdown standard Cs of suspension type vertical isolation barrier 1, breakdown standard Cs tools herein
Body refers to the bottom of suspension type vertical isolation barrier 1 or lateral wall reaches pollutant concentration threshold value, specific pollutant concentration threshold
Value can be by pollutant catabolic gene value（Risk control value or related specifications standard）Or take 10% of initial concentration in contaminated site.
（2）Characteristic according to pollutant depth location to soil layer between the bottom of suspension type vertical isolation barrier 1, passed through according to engineering
Test or test, determine the equivalent coefficient of permeability K and equivalent hydrodynamic dispersion coefficient D of the soil layer.
（3）According to breakdown standard, according to calculation formula C=0.5C0Erfc (Y) calculates Y value, wherein：
C=Cs；
C is the pollutant concentration of the bottom of suspension type vertical isolation barrier 1 or lateral wall, unit mol/L；
Cs is the breakdown standard of the bottom of suspension type vertical isolation barrier 1 or lateral wall, unit mol/L；
C0The depth capacity B of pollutant when being begun one's duty for suspension type vertical isolation barrier 10Locate, liquid phase in Polluted Soil body opening gap
Pollutant concentration, unit mol/L；
Erfc is complementary error function, erfc (Y)=1-erf (Y),；
（4）With reference to foregoing breakdown standard, projected depth B of the suspension type vertical isolation barrier 1 in the soil body is calculated, it calculates public
Formula is：
In formula：
D is greatest contamination depth B0The equivalent hydrodynamic dispersion system of the soil body between the projected depth B of suspension type vertical isolation barrier 1
Number, unit Wei ㎡/s；
T is design service phase, and unit is year；
B0For the depth capacity of pollutant, unit m；
vzFor the percolation flow velocity parallel to the direction of suspension type vertical isolation barrier 1, unit is /s；
It should be noted that above-mentioned vzCalculation formula be：
In formula：
K is the depth capacity B of pollutant0The equivalent infiltration system of the soil body between the projected depth B of suspension type vertical isolation barrier 1
Number；
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 calculation formula C=0.5C0Erfc (Y) and step（4）In meter
Calculate formulaDesign calculate be based on one-dimensional advection and dispersion analytic solutions, suspension type vertical isolation barrier 1
And soil body material meets following to assume in the design process：
（a）The material of suspension type vertical isolation barrier 1 is homogeneous, saturation；
（b）Solid phase and liquid phase volume are incompressible in suspension type vertical isolation barrier 1；
（c）Seepage flow of the contaminant fluid in suspension type vertical isolation barrier 1 obeys Darcy laws, and equivalent coefficient of permeability K is
Constant；
（d）Suspension type vertical isolation barrier 1 medially descends water pollutant concentration C0It is constant in transition process；
（e）Migration of the pollutant in suspension type vertical isolation barrier 1 only occurs in a direction.
Specific derivation is as follows：
（One）The foundation of fundamental equation：
In formula：
Rf is block characteristics, dimensionless；This equation does not consider the One-dimensional Diffusion Equation of seepage flow as；
（Two）Boundary condition is assumed
The solution of diffusion equation depends on primary condition and boundary condition.Boundary condition must be applied to the depth location of pollutant（x
=B0）With the bottom of isolation barrier（x=B）.It is assumed that：1. the soil body is semo-infinite；②B0The soil body between B starts not get dirty
Dye；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 considering seepage effect,It can ignore, so as to which above formula is simplified
For C=0.5C0erfc(Y)。
The beneficial effect of the present embodiment is：（1）The projected depth computational methods of suspension type vertical isolation barrier are easy to be fast
Speed, by determining that it designs service phase and breakdown standard, you can calculate corresponding isolation barrier projected depth, and calculate knot
Fruit is accurate；（2）Current existing design method is generally basede on hydraulic gradient and calculated, more common in isolation barrier both sides head
The higher situation of difference, similar embodiment such case, then can not quantitative design, while do not consider that the diffusion mechanism of pollutant is also
The deficiency of existing design method.
Embodiment 2：As shown in figure 1, the present embodiment is specifically related to a kind of meter of suspension type vertical isolation barrier projected depth
Calculation method, and illustrated with reference to instantiation, certain plot is located at Shanghai City, and place subregion soil is by various heavy
Pollution, need to implement site remediation, mainly take geobiont method reparation.Because bioanalysis expends, the time is longer, and palpus coordinates isolation
Barrier prevents and remedies pollution thing to periphery diffusion, because pollutant buried depth is shallower, therefore uses suspension type vertical isolation barrier 1 to pollutant
Obstructed.According to field condition, greatest contamination depth B0For 1.1m.Specific computational methods comprise the following steps：
（1）The design service phase T for determining suspension type vertical isolation barrier 1 is 5 years, and determines breakdown standard, and the breakdown standard is：
Suspension type vertical isolation barrier 1 can reach the 10% of pollutant concentration initial value；
（2）Investigated according to laboratory test and related data, the equivalent diffusivity for determining soil layer is 6.0E-10m2/s；
（3）Pass through calculation formula C=0.5C afterwards0Erfc (Y) and calculation formula, calculate and obtain
The projected depth that suspension type vertical isolation barrier 1 is buried is 1.65m.
Claims (3)
1. a kind of computational methods of suspension type vertical isolation barrier projected depth, the suspension type vertical isolation barrier bottom and phase
Have to water barrier at regular intervals, 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 suspension type vertical isolation barrier refer to
The bottom of the suspension type vertical isolation barrier or the pollutant concentration threshold value of lateral wall；
（2）According to pollution object location to the characteristic of soil layer between the suspension type vertical isolation barrier bottom, the soil layer is determined
Equivalent coefficient of permeability K and equivalent hydrodynamic dispersion coefficient D；
（3）According to the breakdown standard, according to calculation formula C=0.5C0Erfc (Y) calculates intermediate quantity Y value, wherein：
C=Cs；
C is the pollutant concentration of the suspension type vertical isolation barrier bottom or lateral wall, unit mol/L；
Cs is the breakdown standard of the suspension type vertical isolation barrier bottom or lateral wall, unit mol/L；
C0The depth capacity B of pollutant when being begun one's duty for the suspension type vertical isolation barrier0Locate, liquid in Polluted Soil body opening gap
The pollutant concentration of phase, unit mol/L；
Erfc is complementary error function, erfc (Y)=1-erf (Y),；
（4）With reference to the breakdown standard, design of the suspension type vertical isolation barrier in the soil body is calculated by calculation formula
Depth B, wherein：
D is greatest contamination depth B0The equivalent hydrodynamic dispersion of the soil body between the suspension type vertical isolation barrier projected depth B
Coefficient, unit Wei ㎡/s；
T is the design service phase of the suspension type vertical isolation barrier, and unit is year；
vzFor the percolation flow velocity parallel to the suspension type vertical isolation barrier direction, unit is /s；
B0For the depth capacity of pollutant, unit m.
A kind of 2. computational methods of suspension type vertical isolation barrier projected depth according to claim 1, it is characterised in that
Parallel to the percolation flow velocity v in the suspension type vertical isolation barrier directionzCalculation formula be：
Wherein：
K is the depth capacity B of pollutant0The equivalent infiltration system of the soil body between the suspension type vertical isolation barrier projected depth B
Number；
neFor the effecive porosity of the soil body；
I is the hydraulic gradient in the soil body.
A kind of 3. computational methods of suspension type vertical isolation barrier projected depth according to claim 1, it is characterised in that
The breakdown standard reaches pollutant for the bottom of the suspension type vertical isolation barrier or the pollutant concentration threshold value of lateral wall
The 10% of initial concentration value.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103207212A (en) * | 2013-03-14 | 2013-07-17 | 东南大学 | Device and method for simulation of pollutant vertical isolation barrier |
| CN203275342U (en) * | 2013-03-14 | 2013-11-06 | 东南大学 | Device for simulating vertical isolation barrier of pollutant |
| US20130333928A1 (en) * | 2012-06-13 | 2013-12-19 | International Business Machines Corporation | Implementing feed-through and domain isolation using ferrite and containment barriers |
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2017
- 2017-09-27 CN CN201710887471.2A patent/CN107784160A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130333928A1 (en) * | 2012-06-13 | 2013-12-19 | International Business Machines Corporation | Implementing feed-through and domain isolation using ferrite and containment barriers |
| CN103207212A (en) * | 2013-03-14 | 2013-07-17 | 东南大学 | Device and method for simulation of pollutant vertical isolation barrier |
| CN203275342U (en) * | 2013-03-14 | 2013-11-06 | 东南大学 | Device for simulating vertical isolation barrier of pollutant |
Non-Patent Citations (4)
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|---|
| AKIO OGATA AND R.B. BANKS: "A Solution of the Differential Equation of Longitudinal Dispersion in Porous Media", 《USGS PROFESSIONAL PAPER》 * |
| MOHAMED GALAL A. ELTARABILY等: "Numerical Simulation of Fertilizers Movement in Sand and Controlling Transport Process via Vertical Barriers", 《INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND DEVELOPMENT》 * |
| 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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