CN109165479A - The soil body is applicable in the judgment method of MICP technology - Google Patents
The soil body is applicable in the judgment method of MICP technology Download PDFInfo
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Abstract
The invention discloses the judgment methods that a kind of soil body is applicable in MICP technology, comprising the following steps: grouting slurries total amount is calculated；Substep grouting number is calculated；According to the number of the total amount of grouting slurries and substep grouting, the capacity of grouting slurries every time is calculated；According to the capacity and slurry flow of each grouting slurries, the grouting time of x-th is calculated；According to the grouting time that x-th is in the milk, the first infiltration condition is calculated.The condition judgment formula that the soil body is applicable in MICP technology is characterized by the first infiltration condition, passes through the condition judgment formula, it can be determined that whether the soil body of many influence factors is applicable in MICP technology, and judging result is more accurate.
Description
Technical field
The present invention relates to rock mass engineering project technical fields, and in particular to a kind of soil body is applicable in the judgment method of MICP technology.
Background technique
MICP (microbial induced calcite precipitation, microorganism induction precipitation of calcium carbonate) is
A kind of biomineralization process being widespread in nature, this principle is applied in soil, specific microorganism is passed through
Induction, and sufficient Ca is provided2+And the nutritive salt of nitrogen source, so that the mineralization for accelerating calcite type calcium carbonate crystallization is often claimed
For microorganism induction calcite precipitation technology.Because it is relative to traditional chemical cementitious material, controllability and environment friendly
It is more superior, contain huge economy and environmental benefit.
Currently, many scholars pass through laboratory test, to the ingredient and concentration of bacteria solution active, consolidating fluid, grouting and solidification side
The influence factors such as formula, environment are studied, and are optimized to curing process.Pass through shear stress, non-confining strength
The experimental tests technologies such as degree, dynamic triaxial, lossless geophysics, permeance property are improving soil strength, are reducing liquid to MICP technology
The effect of change, change permeance property etc. has carried out extensive assessment and affirmative.The application of the technology is by initial stage porous Jie
The leak stopping of material, stone matter and cement-based material surface crack defect repair, develop to strengthening soft foundation, reduce sand liquid
Change, build in the sandy beach floated, sand control, bank protection and the engineerings such as repairing environment heavy metal and carbon sequestration.But it makes at present
About there is also two problems, one is applicability problem, i.e., how to judge that can the soil in engineering for the further development of the technology
It is applicable in MICP technology；One be effect assessment, i.e., how to pass through relatively simple effective method and measure solidification effect.
Current research mainly carries out judging whether the soil body is applicable in from the size compatibility of soil particle partial size and microorganism
MICP technology.But judge whether the soil body is applicable in MICP skill only in accordance with the size compatibility of soil particle partial size and microorganism
There are Railway Projects for art: firstly, the pore structure of porous media complexity is difficult to determine by simple parameter；Secondly, engineering
With native usually non-unitary class soil, it is not easy to define, can not be often corresponded to from single soil class.Moreover, various solidification works
The development of skill makes the soil body range for being applicable in MICP technology extend to the fine grained soils such as silt, residual soil.Therefore to being capable of concentrated expression
The research that the soil body of many influence factors is applicable in the judgment method or condition of MICP technology is rather urgent.
Summary of the invention
Based on this, it is necessary to carry out whether judging the soil body for the size compatibility by soil particle partial size and microorganism
It is applicable in MICP technology, judges the problem of inaccuracy, the judgment method that a kind of soil body is applicable in MICP technology is provided.
A kind of soil body is applicable in the judgment method of MICP technology, comprising the following steps:
Grouting slurries total amount is calculated；
Substep grouting number is calculated；
According to the number of the total amount of grouting slurries and substep grouting, the capacity of grouting slurries every time is calculated；According to every
The capacity and slurry flow of secondary grouting slurries, are calculated the grouting time of x-th；And
According to the grouting time that x-th is in the milk, the first infiltration condition is calculated.
Described the step of grouting slurries total amount is calculated in one of the embodiments, specifically:
If soil body primary clearance rate is n0, soil body volume is V, and it is respectively the soil body that bacterium solution and the volume of consolidating fluid are perfused every time
The β of pore volume and α times, entire solidification are completed by n times cycle grouting, then grouting slurries total amount V during solidifyingUCAre as follows:
VUC=N (alpha+beta) n0V。 (1)
Described the step of substep grouting number is calculated in one of the embodiments, specifically:
Consolidating fluid capacity V is poured into during solidificationCAre as follows:
VC=N α n0V (2)
The precipitation of calcium carbonate calcium ion molar ratio corresponding with calcium salt that theoretical calculation generates is 1:1, defines calcium carbonate yield S
For the precipitation of calcium carbonate quality of actual outputThe ratio between with calculated value, then have:
In formula,For the calcium salt molar concentration of injection,For calcium carbonate molal weight；DefinitionFor unit
The precipitation of calcium carbonate quality actually generated in the grouting soil body, then
The solidification number of substep grouting is calculated are as follows:
The number that the total amount and substep according to grouting slurries is in the milk in one of the embodiments, is calculated every
The capacity of secondary grouting slurries；According to the capacity and slurry flow of each grouting slurries, the step of the grouting time of x-th is calculated
Suddenly specifically:
Since the volume of slip casting liquid will not change, and slurry flow Q meets Darcy's law:
Q=qA (6)
In formula, A be slip casting soil mass section area, the three dimensional form of percolation flow velocity q:
In formula,For hydraulic gradient vector, k is infiltration coefficient；
If k0For initial infiltration coefficient, infiltration coefficient is reduced to k after n times are in the milkN:
kN=ξ k0 (8)
In formula, ξ is impact factor；
Assuming that soil body permeability linearly reduces after grouting every time, and infiltrative change in cyclic process of being in the milk every time is neglected
Slightly disregard, then infiltration coefficient is reduced after solidification every time are as follows:
Δ k=(k0-kN)/N (9)
Then infiltration coefficient after x-th grouting are as follows:
Grouting slurries capacity every time are as follows:
The grouting time of x-th grouting is calculated according to formula (6), (7), (10) and (11):
In formula, L is the depth of the soil body.
The grouting time being in the milk according to x-th in one of the embodiments, is calculated the first infiltration condition
Step specifically:
After being in the milk several times, with the generation of precipitation of calcium carbonate in the soil body, permeability is gradually decreased, every time when grouting
Between increase, until perfusion can not be completed within the time [t] that bacteria solution active or operating condition allow, then n-th grouting time palpus
Meet:
tN≤[t] (13)
It brings formula (12) into above-mentioned formula and obtains the first infiltration condition:
The grouting time being in the milk according to x-th in one of the embodiments, is calculated the first infiltration condition
After step further include:
According to cured strength demand, the production quantity of calcium carbonate in the required unit soil body is determinedThen through N
The calcium carbonate quality generated in the soil body after secondary grouting:
It brings (6) formula into above formula and obtains the second infiltration condition:
It is calculated after the second infiltration condition in one of the embodiments, further include:
It brings (16) formula into (14) formula and obtains third infiltration condition:
In one of the embodiments, when the soil body is cohesive soil, ξ 0.1, when the soil body is non-cohesive soil, ξ is
0.01。
The above-mentioned soil body is applicable in the judgment method of MICP technology, time that grouting slurries total amount is obtained by calculation and is in the milk respectively
Number is calculated every time then according to the number of the total amount of grouting slurries and substep grouting according to the capacity of grouting slurries, then root
According to the capacity and slurry flow being in the milk every time, the grouting time of x-th grouting is calculated, finally according to grouting time, calculates
Obtain the first infiltration condition.The condition judgment formula that the soil body is applicable in MICP technology is characterized by the first infiltration condition, passes through this
Part judgment formula, it can be determined that whether the soil body of many influence factors is applicable in MICP technology, and judging result is more accurate.
Detailed description of the invention
Fig. 1 is the flow chart for the judgment method that the soil body is applicable in MICP technology in an embodiment.
Specific embodiment
In order to make the foregoing objectives, features and advantages of the present invention clearer and more comprehensible, with reference to the accompanying drawing to the present invention
Specific embodiment be described in detail.Many details are explained in the following description in order to fully understand this hair
It is bright.But the invention can be embodied in many other ways as described herein, those skilled in the art can be not
Similar improvement is done in the case where violating intension of the present invention, because the invention is not limited by following public specific implementation.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element
Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
" right side " and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.
Referring to Fig. 1, the soil body in an embodiment is applicable in the judgment method of MICP technology, for judging that the complicated soil body is
No applicable MICP technology, and be in the milk mainly for the saturation under substep, low speed processes.Wherein, low speed generally refers to be in the milk
Flow velocity is less than 5ml/min, and substep grouting, which refers to, pours into bacterium solution in advance, pours into consolidating fluid (urea and calcium salt again after a period of time
Mixed liquor).Specifically, which mainly includes the following steps:
Step S110: grouting slurries total amount is calculated.
Specifically, it is assumed that precipitation of calcium carbonate does not influence the total volume of liquid, and the liquid that is in the milk is that incompressible homogeneous is each
To same sex Newtonian fluid, ignore the time variation of viscosity, the filter effect of slurries.According to the body of solidification process and hypothesis grouting slurries
Product will not change, if soil body primary clearance rate is n0, soil body volume is V (m3), the volume of bacterium solution and consolidating fluid is perfused every time
The respectively β of soil body pore volume and α times, entire solidification are completed by n times cycle grouting, then grouting slurries total amount during solidifying
VUCAre as follows:
VUC=N (alpha+beta) n0V (1)
In formula, β and α can be according to Grouting Design parameter values, it is contemplated that the premise and slurries for being saturated grouting are in soil body hole
In be uniformly distributed, α, β are both needed to pour into bacterium solution and consolidating fluid is all larger than equal to one times pore volume not less than 1.
Step S120: substep grouting number is calculated.
Specifically, consolidating fluid capacity V is poured into during curingC(L) are as follows:
VC=N α n0V (2)
It is assumed that microorganism cementing process only occurs to react as follows:
According to above-mentioned reaction it is found that the precipitation of calcium carbonate calcium ion molar ratio corresponding with calcium salt that theoretical calculation generates is 1:
1.Define the precipitation of calcium carbonate quality that calcium carbonate yield S (%) is actual outputThe ratio between with calculated value, then have:
In formula,For the calcium salt molar concentration (M) of injection,For calcium carbonate molal weight, constant is
100.1kg/kmol.DefinitionIt is in the milk the precipitation of calcium carbonate quality that actually generates in the soil body for unit, then
Have:
The solidification number of substep grouting can be calculated in simultaneous formula (3)~(5) are as follows:
Step S130: according to the number of the total amount of grouting slurries and substep grouting, the appearance of grouting slurries every time is calculated
Amount；According to the capacity and slurry flow of each grouting slurries, the grouting time of x-th grouting is calculated.
Specifically, since the volume of slip casting liquid will not change, and slurry flow Q meets Darcy's law:
Q=qA (6)
In formula, A is slip casting soil mass section area (m2), due to current MICP technology using test specimen be mostly cylindrical body, it is rectangular
Body or cube, therefore it is set as cross-section form.Wherein, the three dimensional form of percolation flow velocity q:
In formula,For hydraulic gradient vector, k (m/s) is infiltration coefficient.
Enable k0For initial infiltration coefficient, infiltration coefficient is reduced to k after n times are in the milkN:
kN=ξ k0 (8)
In formula, ξ is impact factor, when the soil body is cohesive soil, ξ 0.1, and when the soil body is non-cohesive soil, ξ 0.01.
Assuming that soil body permeability linearly reduces after grouting every time, and infiltrative change in cyclic process of being in the milk every time is neglected
Slightly disregard, then infiltration coefficient is reduced after solidification every time are as follows:
Δ k=(k0-kN)/N (9)
Then infiltration coefficient after x-th grouting are as follows:
By aforementioned formula (1) it is found that grouting slurries capacity every time is calculated are as follows:
In formula, tx(s) it is x-th grouting duration, each x-th is calculated according to formula (6), (7), (10), (11)
Grouting time:
In formula, L is the depth of the soil body.
Therefore, the grouting total duration comprising n times substep grouting are as follows:
Step S140: the first infiltration condition is calculated in the grouting time being in the milk according to x-th.
Specifically, meet the infiltration condition of MICP mainly from the aspect of two.It on the one hand, is the sustainability of grouting.It fills
At slurry initial stage, infiltration is very fast, and after being in the milk several times, with the generation of precipitation of calcium carbonate in the soil body, permeability is gradually decreased, often
Secondary grouting time increases, until perfusion can not be completed within the time [t] that bacteria solution active or operating condition allow.Then n-th fills
The slurry time must meet:
tN≤[t] (13)
It brings formula (12) into above-mentioned formula and obtains the first infiltration condition:
As shown from the above formula, the first infiltration condition is with initial infiltration coefficient k0Whether meeting License Value is foundation,
And the factor for influencing initial infiltration coefficient has 7, it is contemplated that this research is mainly for saturation quantitative filling, hydraulic gradient J
Can approximation take 1.Although strain used in each research team, condition of culture, dilute strength and environmental condition are variant, in conjunction with it
Enzyme activity test data takes [t]=for 24 hours, and each soil body initial porosity, soil sample height, slurries capacity are it is known that therefore influencing initial
The main parameters of infiltration coefficient License Value are ξ, when ξ takes 10 respectively-1, 10-2, 10-3When, 1~3 order of magnitude is as a result differed, to k0
The influence of value is far longer than other parameters.But work as ξ=10-3, corresponding license initial infiltration coefficient k0Boundary is excessively high, without soil
Body can satisfy, and should not choose.And by finding after analysis checking computations, the first infiltration condition is more suitable for the judgement of no-Co-alloy steel.
Further, the second aspect for meeting infiltration condition is solidification effect, the main intensity for considering the soil body after solidifying
It needs.Experiments have shown that the UCS of sand column and calcium carbonate content have a preferable correlation, calcium carbonate content be higher than 3.5% or
60kg/m3When, soil strength just has clear improvement.Therefore, required unit can be determined according to specific solidification intensity demand
The production quantity of calcium carbonate in the soil bodyThe calcium carbonate quality then generated in the soil body after n times are in the milk:
It brings (6) formula into above formula and obtains the second infiltration condition:
As shown from the above formula, the second infiltration condition is derived based on mass conservation law, the second infiltration condition with
Initial porosity n0Whether meeting License Value is foundation, and the factor for influencing initial infiltration coefficient has 5, it is contemplated that this research
Mainly for saturation quantitative filling, the more universal grouting data N=5 of use is calculated,Take 60kg/
m3.And by finding after analysis checking computations, the second infiltration condition is preferably used as perfusion time in the initial compaction rate of the soil body and grouting process
Several designs calculates.
Further, it is calculated after the second infiltration condition, (16) formula can be brought into (14) formula and obtain third infiltration
Condition:
It can be seen from the above, similar to the first infiltration condition, third infiltration condition is with initial infiltration coefficient k0Whether meet
License Value is foundation, and considering for the conservation of mass is increased on the application foundation of penetration theory, influences its initial infiltration coefficient
The factor have 11.With the first infiltration condition, J=1 is taken, [t]=for 24 hours, n0, L, α, β press each soil body known conditions value.With the
Two infiltration conditions, N=5,S takes 50%, ξ desirable 10-2~10-1.By being found after analysis checking computations,
The infiltration condition judgement that third infiltration condition is applicable in MICP technology to the soil body has preferable universality, takes to non-stickiness soil body ξ
10-2, 10 are taken to stickiness soil body ξ-1The judgement of calculated result can be made more accurate.
The above-mentioned soil body is applicable in the judgment method of MICP technology, time that grouting slurries total amount is obtained by calculation and is in the milk respectively
Number is calculated every time then according to the number of the total amount of grouting slurries and substep grouting according to the capacity of grouting slurries, then root
According to the capacity and slurry flow being in the milk every time, the grouting time of x-th grouting is calculated, finally according to grouting time, calculates
Obtain the first infiltration condition.The condition judgment formula that the soil body is applicable in MICP technology is characterized by the first infiltration condition, passes through this
Part judgment formula, it can be determined that whether the soil body of many influence factors is applicable in MICP technology, and judging result is more accurate.Also,
The infiltration condition that third infiltration condition is applicable in MICP technology to the soil body judges that universality is more excellent, judgement can be made to tie by the value of ξ
Fruit is more accurate；And the first infiltration condition is more suitable for the judgement to no-Co-alloy steel, only includes 7 parameters and is easier to measure, it is right
The sandy soil widely applied in MICP technology has preferable applicability；Second infiltration condition is preferably used as the initial compaction rate of the soil body
It is calculated with the design that number is perfused in grouting process.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (8)
1. the judgment method that a kind of soil body is applicable in MICP technology, which comprises the following steps:
Grouting slurries total amount is calculated；
Substep grouting number is calculated；
According to the number of the total amount of grouting slurries and substep grouting, the capacity of grouting slurries every time is calculated；It is filled according to each
The capacity and slurry flow for starching slurries, are calculated the grouting time of x-th；And
According to the grouting time that x-th is in the milk, the first infiltration condition is calculated.
2. the judgment method that the soil body according to claim 1 is applicable in MICP technology, which is characterized in that described that filling is calculated
The step of starching slurries total amount specifically:
If soil body primary clearance rate is n0, soil body volume is V, and it is respectively soil body hole that bacterium solution and the volume of consolidating fluid are perfused every time
The β of volume and α times, entire solidification are completed by n times cycle grouting, then grouting slurries total amount V during solidifyingUCAre as follows:
VUC=N (alpha+beta) n0V。 (1)
3. the judgment method that the soil body according to claim 2 is applicable in MICP technology, which is characterized in that described to be calculated point
The step of step grouting number specifically:
Consolidating fluid capacity V is poured into during solidificationCAre as follows:
VC=N α n0V (2)
The precipitation of calcium carbonate calcium ion molar ratio corresponding with calcium salt that theoretical calculation generates is 1:1, and it is real for defining calcium carbonate yield S
The precipitation of calcium carbonate quality of border outputThe ratio between with calculated value, then have:
In formula,For the calcium salt molar concentration of injection,For calcium carbonate molal weight；DefinitionFor unit grouting
The precipitation of calcium carbonate quality actually generated in the soil body, then
The solidification number of substep grouting is calculated are as follows:
4. the judgment method that the soil body according to claim 3 is applicable in MICP technology, which is characterized in that described to be starched according to grouting
The total amount of liquid and the number of substep grouting, are calculated the capacity of grouting slurries every time；According to the capacity of each grouting slurries and
Slurry flow, the step of grouting time of x-th is calculated specifically:
Since the volume of slip casting liquid will not change, and slurry flow Q meets Darcy's law:
Q=qA (6)
In formula, A be slip casting soil mass section area, the three dimensional form of percolation flow velocity q:
Q=kJ=-k ▽ φ (7)
In formula, J=- ▽ φ is hydraulic gradient vector, and k is infiltration coefficient；
If k0For initial infiltration coefficient, infiltration coefficient is reduced to k after n times are in the milkN:
kN=ξ k0 (8)
In formula, ξ is impact factor；
Assuming that soil body permeability linearly reduces after grouting every time, and infiltrative change in cyclic process of being in the milk every time is ignored not
Meter, then infiltration coefficient is reduced after solidification every time are as follows:
Δ k=(k0-kN)/N (9)
Then infiltration coefficient after x-th grouting are as follows:
Grouting slurries capacity every time are as follows:
The grouting time of x-th grouting is calculated according to formula (6), (7), (10) and (11):
In formula, L is the depth of the soil body.
5. the judgment method that the soil body according to claim 4 is applicable in MICP technology, which is characterized in that described according to x-th
The grouting time of grouting, the step of the first infiltration condition is calculated specifically:
After being in the milk several times, with the generation of precipitation of calcium carbonate in the soil body, permeability is gradually decreased, and each grouting time increases
Add, until perfusion can not be completed within the time [t] that bacteria solution active or operating condition allow, then n-th grouting time must meet:
tN≤[t] (13)
It brings formula (12) into above-mentioned formula and obtains the first infiltration condition:
6. the judgment method that the soil body according to claim 5 is applicable in MICP technology, which is characterized in that described according to x-th
The grouting time of grouting, after the step of the first infiltration condition is calculated further include:
According to cured strength demand, the production quantity of calcium carbonate in the required unit soil body is determinedThen filled through n times
The calcium carbonate quality generated in the soil body after slurry:
It brings (6) formula into above formula and obtains the second infiltration condition:
7. the judgment method that the soil body according to claim 6 is applicable in MICP technology, which is characterized in that the second infiltration is calculated
After saturating condition further include:
It brings (16) formula into (14) formula and obtains third infiltration condition:
8. the judgment method that the soil body according to claim 7 is applicable in MICP technology, which is characterized in that when the soil body is cohesive soil
When, ξ 0.1, when the soil body is non-cohesive soil, ξ 0.01.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107100162A (en) * | 2017-05-19 | 2017-08-29 | 南京林业大学 | A kind of solid indigenous method of microorganism gas-liquid cycle slip casting |
| CN108049409A (en) * | 2017-11-14 | 2018-05-18 | 河海大学 | A kind of method of the solid soil of microbes synthase inhibitor slip casing by pressure |
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2018
- 2018-10-29 CN CN201811270321.8A patent/CN109165479B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107100162A (en) * | 2017-05-19 | 2017-08-29 | 南京林业大学 | A kind of solid indigenous method of microorganism gas-liquid cycle slip casting |
| CN108049409A (en) * | 2017-11-14 | 2018-05-18 | 河海大学 | A kind of method of the solid soil of microbes synthase inhibitor slip casing by pressure |
Non-Patent Citations (3)
| Title |
|---|
| NG WEI SOON等: "Improvements in engineering properties of soils through microbial-induced calcite precipitation", 《KSCE JOURNAL OF CIVIL ENGINEERING》 * |
| 孙潇昊，缪林昌，童天志，王呈呈: "微生物沉积碳酸钙固化砂土试验研究", 《岩土力学》 * |
| 崔明娟，郑俊杰，赖汉江: "颗粒粒径对微生物固化砂土强度影响的试验研究", 《岩土力学》 * |
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