CN106841033A - The pH value and porosity real-time test device and method of nanogel solidification sand - Google Patents
The pH value and porosity real-time test device and method of nanogel solidification sand Download PDFInfo
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- CN106841033A CN106841033A CN201710036481.5A CN201710036481A CN106841033A CN 106841033 A CN106841033 A CN 106841033A CN 201710036481 A CN201710036481 A CN 201710036481A CN 106841033 A CN106841033 A CN 106841033A
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- 239000004576 sand Substances 0.000 title claims abstract description 50
- 238000012360 testing method Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000007711 solidification Methods 0.000 title claims abstract description 15
- 230000008023 solidification Effects 0.000 title claims abstract description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 68
- 239000011148 porous material Substances 0.000 claims abstract description 35
- 229920001971 elastomer Polymers 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000012528 membrane Substances 0.000 claims abstract description 8
- 238000012806 monitoring device Methods 0.000 claims abstract description 8
- 230000008595 infiltration Effects 0.000 claims description 24
- 238000001764 infiltration Methods 0.000 claims description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 19
- 239000002184 metal Substances 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 9
- 239000004744 fabric Substances 0.000 claims description 8
- 239000004575 stone Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 5
- 230000011218 segmentation Effects 0.000 claims description 5
- 239000013307 optical fiber Substances 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 239000003292 glue Substances 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims 1
- 238000009738 saturating Methods 0.000 claims 1
- 238000005325 percolation Methods 0.000 abstract description 15
- 238000007493 shaping process Methods 0.000 abstract description 2
- 230000003204 osmotic effect Effects 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 230000003019 stabilising effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Dispersion Chemistry (AREA)
- Fluid Mechanics (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
Cylinder long, monitoring device, liquid collecting container, hydraulic controller and pressure seal are molded the invention discloses a kind of pH value and porosity real-time test device and method along percolation path nanogel solidification sand, including sample；Sample is molded places sand sample in cylinder long；The monitoring device is included in n pore pressure gauge and the PH meter that sample is molded step-by-step arrangement in cylinder long；The pressure seal rubber membrane is isolated into two chambers, and one of chamber is connected with hydraulic controller, and another chamber is filled Ludox and is connected with sample shaping cylinder long；The hydraulic controller, pressure seal, sample are molded cylinder long and liquid collecting container is sequentially connected.The present invention overcomes existing apparatus to be difficult to the analysis non-uniformity problem solidified along percolation path and the problem that cannot in real time measure the sand porosity change in Ludox pH value and solidification process in percolation path.
Description
Technical field
The invention belongs to geotechnical study field, more particularly to a kind of PH for solidifying sand along percolation path nanogel
Value and porosity real-time test device and method.
Background technology
Nano silica sol is suspension of the nanometer silicon dioxide particle in water, and these particles are mutually arranged under alkaline environment
Reprimand, suspension is stabilising system.When pH value is reduced to certain limit, these nano particles are first gradually condensed into chain structure and enter
And the gel of tridimensional network is formed, this nano gel system can reinforce loosening sand ground, and reinforcement means is that silicon is molten
Glue seepage flow enters in saturated sand foundation.In flow event, the advancing interface of Ludox constantly elapses in sand foundation, seepage flow
Its pH value of different positions and the porosity because of solidification reduction are different on path, obtain the reality of diverse location in percolation path
When pH value and porosity help to set up the consolidation theory model of Nano silica sol.But prior art cannot be provided along seepage flow road
On footpath in Ludox pH value and solidification process sand porosity real-time measurements, it is difficult to analysis along seepage direction solidification not
Uniformity, therefore development measures the apparatus and method of the pH value of Ludox solidification sand and porosity in percolation path particularly in real time
It is important.
The content of the invention
The present invention cannot be measured in percolation path in Ludox pH value and solidification process in real time in order to overcome existing apparatus
The problem of sand porosity change, and the non-uniformity problem that analysis solidifies along percolation path is difficult to, the invention provides one
Plant along the pH value and porosity real-time test device and method of percolation path nanogel solidification sand.
Technical scheme：A kind of nanogel solidifies the pH value and porosity real-time test device of sand, including
Sample is molded cylinder long, monitoring device, liquid collecting container, hydraulic controller and pressure seal；Sample is molded in cylinder long and puts
Put sand sample；The monitoring device is included in n pore pressure gauge and the PH meter that sample is molded step-by-step arrangement in cylinder long；It is described
Pressure seal rubber membrane is isolated into two chambers, and one of chamber is connected with hydraulic controller, another chamber dress
Full Ludox is molded cylinder long and is connected with sample；The hydraulic controller, pressure seal, sample are molded cylinder long and liquid is collected
Container is sequentially connected.
Preferably, it is the PVC cylindrical tubes of open at both ends that the sample is molded cylinder long, highly with diameter ratio >=10, cut-off
Footpath is 100mm, wall thickness 6mm, is highly 1m.
Preferably, the PH is calculated as optical fiber pH meter.
Preferably, PH meters and pore pressure gauge are molded cylinder inwall long along sand sample axis equidistant placement in sample,
, with axis as symmetry axis, PH is counted and pore water pressure on same vertical curve for PH meters and pore pressure gauge in same level
Meter is alternately arranged.
Preferably, the sample is molded cylinder bottom long and is plugged with the first rubber stopper, and sample is molded cylinder top long and is plugged with the second rubber
Plug, first rubber stopper is placed above metal filtration screen cloth, to prevent Ludox access road from blocking.
Preferably, the permeable stone that one piece of thickness is 5mm is placed above in metal filtration screen cloth, can be uniform in order to Ludox
On the cross section of ground injection sand sample.
A kind of pH value and porosity method for real-timely testing for solidifying sand along percolation path nanogel, including following steps
Suddenly：
Step 1：The sealed bottom that sample is molded cylinder long is lived with the first rubber stopper, metal mistake is placed on the first rubber stopper
Screen net, places permeable stone on metal filtration screen cloth, is then molded toward sample and sand sample is placed in cylinder long, in sand sample
In placement process, pore pressure gauge and optical fiber pH meter are arranged along sand sample seepage direction, will finally be tried with the second rubber stopper
Sample is molded at the top of cylinder long and seals up；
Step 2：The first chamber of connection hydraulic controller and pressure seal, the second chamber in pressure seal
Ludox is filled, second chamber is then connected and sample is molded cylinder long, connection sample is molded cylinder long and liquid collecting container；
Step 3：Start hydraulic controller and pressure, real time record hydraulic pressure control are applied to the rubber membrane in pressure seal
The decrement of water in device, the cross-sectional area of cylinder long is molded with reference to sample, can in real time obtain the flow velocity V that sample is molded in cylinder long,
While pH value and hydraulic pressure on each monitoring point of real time record, if being molded cylinder length direction PH long in respect of n, the PH of bottom along sample
Meter numbering is 1, and PH meters numbering increases successively from the bottom up, and PH meter numberings in top are n, and corresponding real-time pH value is A1(t),A2
(t),Λ,AnT (), the pH value between i-th PH meter and i+1 PH meters is by Ai(t) and Ai+1T () linear interpolation is obtained；
Step 4：Real-time segmentation calculates the infiltration coefficient of sample：If being molded cylinder length direction pore pressure gauge long along sample
There is n, the pore pressure gauge numbering of bottom is 1, and pore pressure gauge increases successively from the bottom up, top pore pressure gauge
Numbering is n, and corresponding real-time pore water pressure is P1(t),P2(t),Λ,PnT (), sample is molded cylinder 1 long by pore pressure gauge
It is divided into n-1 sections, every section of infiltration coefficientFor：
ρ in above formulawIt is water density, g is acceleration of gravity, and L is that sample is molded cylinder long highly.
Seek corresponding real-time infiltration coefficient in each pore water pressure node i (1≤i≤n)：
Define along infiltration coefficient piecewise interpolation function f (x, t) in sample axis direction：
L=L/ (n-1), x in above formulal=x-l (i-1), and l (i-1)≤x≤li.Inserted by infiltration coefficient segmentation
Value function f (x, t) can obtain the infiltration coefficient along specimen length direction every bit；
Step 5：Change curve θ (x, t) of the porosity along specimen length direction is calculated in real time：IfIt is the average grain of sand particle
Footpath, θ is porosity, and c is constant coefficient, using osmotic coefficient k and the functional relation of porosity：
Above-mentioned formula is 0≤θ in porosity span<It is monotropic function when 1, by the infiltration coefficients point of the k in above formula
Section interpolating function f (x, t) replaces, and solves above formula, that is, obtain porosity function θ (x, t) along seepage direction and time change, from
And the inhomogeneities for solidifying sand along the change of seepage direction porosity and nanogel can be analyzed.
Beneficial effects of the present invention：Overcoming existing apparatus cannot in real time measure Ludox pH value and solidification in percolation path
During sand porosity change problem, and existing apparatus be difficult to analysis along percolation path solidify non-uniformity problem,
The invention provides a kind of pH value and porosity real-time test device and method along percolation path nanogel solidification sand.
Brief description of the drawings
Fig. 1 is complete layout of the invention；
Fig. 2 is that sample of the invention is molded cylinder top view long；
Fig. 3 is that sample of the invention is molded cylinder side view long.
In figure 1. samples be molded cylinder long, 2. pore pressure gauge, 3.PH meters, 4. hydraulic controller, 5. pressure seal,
6. liquid collecting container, 7. the first rubber stopper, 8. metal filtration screen cloth, 9. permeable stone, 10. sand sample, 11. rubber membranes, 12.
One chamber, 13. second chambers, 14. second rubber stoppers.
Specific embodiment
In order that technological means, character of innovation, reached purpose and effect that the present invention is realized are easy to understand, tie below
Conjunction is specifically illustrating, and the present invention is expanded on further.
A kind of pH value and porosity real-time test device for solidifying sand along percolation path nanogel in such as Fig. 1, including
Sample is molded cylinder 1, monitoring device long, liquid collecting container 6, hydraulic controller 4 and pressure seal 5；Sample is molded cylinder 1 long
Interior placement sand sample 10；The monitoring device is included in the He of n pore pressure gauge 2 that sample is molded step-by-step arrangement in cylinder 1 long
PH meters 3；The rubber membrane 11 of the pressure seal 5 is isolated into two chambers, wherein first chamber 12 and the phase of hydraulic controller 4
Even, second chamber 13 is filled Ludox and is connected with sample shaping cylinder 1 long；The hydraulic controller 4, pressure seal 5, examination
Sample is molded cylinder 1 long and liquid collecting container 6 is sequentially connected.
The present invention is along the pH value of percolation path nanogel solidification sand and the course of work of porosity method for real-timely testing
It is as follows：
Step 1：The bottom that sample is molded cylinder long 1 is sealed with the first rubber stopper 7, metal is placed on the first rubber stopper 7
Filter screen 8, places permeable stone 9 on metal filtration screen cloth 8, is then molded toward sample and sand sample 10 is placed in cylinder 1 long,
In the placement process of sand sample 10, pore pressure gauge 2 and PH meters 3 are arranged along sand sample seepage direction, finally use the second rubber
Plug 14 seals up the top that sample is molded cylinder long 1；
Step 2：The first chamber 12 of connection hydraulic controller 4 and pressure seal 5, in pressure seal 5 the
Two chambers 13 are filled Ludox, then connect second chamber 13 and sample is molded cylinder 1 long, and connection sample is molded cylinder 1 long and liquid
Collection vessel 6；
Step 3：Start hydraulic controller 4 and pressure, real time record hydraulic pressure are applied to the rubber membrane 11 in pressure seal
The decrement of water in controller 4, the cross-sectional area of cylinder 1 long is molded with reference to sample, can in real time be obtained sample and is molded in cylinder 1 long
Flow velocity V, while pH value and hydraulic pressure on each monitoring point of real time record, if being molded the length direction PH of cylinder 1 long in respect of n along sample,
The PH meter numberings of bottom are 1, and the numbering of PH meters 3 increases successively from the bottom up, and PH meter numberings in top are n, and corresponding real-time pH value is
A1(t),A2(t),Λ,AnT (), the pH value between i-th PH meter and i+1 PH meters is by Ai(t) and Ai+1T () linear interpolation is obtained
Arrive；
Step 4：Real-time segmentation calculates the infiltration coefficient of sample：If being molded the length direction pore water pressure of cylinder 1 long along sample
In respect of n, the pore pressure gauge numbering of bottom is 1, and pore pressure gauge 2 increases successively from the bottom up, top pore water pressure
Power meter numbering is n, and corresponding real-time pore water pressure is P1(t),P2(t),Λ,PnT (), sample is molded cylinder 1 long by pore water pressure
Power score is n-1 sections, every section of infiltration coefficientFor：
ρ in above formulawIt is water density, g is acceleration of gravity, and L is that sample is molded cylinder long highly.
Seek corresponding real-time infiltration coefficient in each pore water pressure node i (1≤i≤n)：
Define along infiltration coefficient piecewise interpolation function f (x, t) in specimen length direction：
L=L/ (n-1), x in above formulal=x-l (i-1), and l (i-1)≤x≤li.Inserted by infiltration coefficient segmentation
Value function f (x, t) can obtain the infiltration coefficient along specimen length direction every bit；
Step 5：Change curve θ (x, t) of the porosity along specimen length direction is calculated in real time：IfIt is the average grain of sand particle
Footpath, θ is porosity, and c is constant coefficient, using osmotic coefficient k and the functional relation of porosity：
Above-mentioned formula is 0≤θ in porosity span<It is monotropic function when 1, by the infiltration coefficients point of the k in above formula
Section interpolating function f (x, t) replaces, and solves above formula, that is, obtain porosity function θ (x, t) along seepage direction and time change, from
And the inhomogeneities for solidifying sand along the change of seepage direction porosity and nanogel can be analyzed.
Claims (9)
1. a kind of nanogel solidifies the pH value and porosity real-time test device of sand, it is characterised in that：It include sample into
Type cylinder long, monitoring device, liquid collecting container, hydraulic controller and pressure seal；Sample is molded in cylinder long places sand examination
Sample；The monitoring device is included in n pore pressure gauge and the PH meter that sample is molded step-by-step arrangement in cylinder long；The pressure every
Two chambers are isolated into from device rubber membrane, one of chamber is connected with hydraulic controller, and it is molten that another chamber fills silicon
Glue is molded cylinder long and is connected with sample；The hydraulic controller, pressure seal, sample be molded cylinder long and liquid collecting container according to
Secondary connection.
2. a kind of nanogel according to claim 1 solidifies the pH value and porosity real-time test device of sand, and it is special
Levy and be：It is the PVC cylindrical tubes of open at both ends that the sample is molded cylinder long, highly with diameter ratio >=10.
3. a kind of nanogel according to claim 1 solidifies the pH value and porosity real-time test device of sand, and it is special
Levy and be：The PH is calculated as optical fiber pH meter.
4. a kind of nanogel according to claim 1 solidifies the pH value and porosity real-time test device of sand, and it is special
Levy and be：The PH meters and pore pressure gauge are molded cylinder inwall long along sand sample axis equidistant placement in sample, same
, with axis as symmetry axis, PH meters and pore pressure gauge are handed on same vertical curve for PH meters and pore pressure gauge on horizontal plane
For arrangement.
5. a kind of nanogel according to right 1 solidifies the pH value and porosity real-time test device of sand, and its feature exists
In：The sample is molded cylinder bottom long and is plugged with the first rubber stopper, and sample is molded cylinder top long and is plugged with the second rubber stopper, described first
Rubber stopper is placed above metal filtration screen cloth, to prevent Ludox access road from blocking.
6. a kind of nanogel according to right 1 solidifies the pH value and porosity real-time test device of sand, and its feature exists
In：The permeable stone that one piece of thickness is 5mm is placed above in metal filtration screen cloth, sand examination can be uniformly injected into order to Ludox
On the cross section of sample.
7. a kind of nanogel as claimed in claim 5 solidifies the pH value of sand and the test side of porosity real-time test device
Method, it is characterised in that：It comprises the steps：
Step 1：The bottom that sample is molded cylinder long is sealed with the first rubber stopper, metal filtration sieve is placed on the first rubber stopper
Net, places permeable stone on metal filtration screen cloth, is then molded toward sample and sand sample is placed in cylinder long, is placed in sand sample
During, along sand sample seepage direction arrange pore pressure gauge and optical fiber pH meter, finally with the second rubber stopper by sample into
Sealed up at the top of type cylinder long；
Step 2：The first chamber of connection hydraulic controller and pressure seal, the second chamber in pressure seal is filled
Ludox, then connects second chamber and sample is molded cylinder long, and connection sample is molded cylinder long and liquid collecting container；
Step 3：Start hydraulic controller and pressure is applied to the rubber membrane in pressure seal, in real time record hydraulic controller
The decrement of water, the cross-sectional area of cylinder long is molded with reference to sample, can in real time obtain the flow velocity V that sample is molded in cylinder long, while
PH value and hydraulic pressure on each monitoring point of real time record, if being molded cylinder length direction PH long in respect of n along sample, the PH meters of bottom are compiled
Number be 1, from the bottom up PH meter numbering increase successively, top PH meter numbering be n, corresponding real-time pH value be A1(t),A2(t),Λ,
AnT (), the pH value between i-th PH meter and i+1 PH meters is by Ai(t) and Ai+1T () linear interpolation is obtained；
Step 4：Real-time segmentation calculates the infiltration coefficient of sample and obtains infiltration coefficient piecewise interpolation function f (x, t)；
Step 5：Change curve θ (x, t) of the porosity along specimen length direction is calculated in real time, by infiltration coefficient and the letter of porosity
Number relation and infiltration coefficient piecewise interpolation function f (x, t) calculate porosity θ (x, t).
8. the test of the pH value and porosity real-time test device of a kind of nanogel solidification sand according to claim 7
Method, it is characterised in that：Set in step 4 and be molded cylinder length direction pore water pressure long in respect of n, the pore water of bottom along sample
Pressure gauge numbering is 1, and pore pressure gauge increases successively from the bottom up, and pore pressure gauge numbering in top is n, corresponding real-time
Pore water pressure is P1(t),P2(t),Λ,PnT (), sample is molded cylinder 1 long and is divided into n-1 sections by pore pressure gauge, every section oozes
Saturating coefficient(1≤i≤n-1) is：
ρ in above formulawIt is water density, g is acceleration of gravity, and L is that sample is molded cylinder long highly.
Seek corresponding real-time infiltration coefficient in each pore water pressure node i (1≤i≤n)：
Define along infiltration coefficient piecewise interpolation function f (x, t) in sample axis direction：
L=L/ (n-1), x in above formulal=x-l (i-1), and l (i-1)≤x≤li.By infiltration coefficient piecewise interpolation function
F (x, t) can obtain the infiltration coefficient along specimen length direction every bit.
9. the test of the pH value and porosity real-time test device of a kind of nanogel solidification sand according to claim 7
Method, it is characterised in that：In step 5, ifIt is sand mean particle size, θ is porosity, and c is constant coefficient, using infiltration coefficient
The functional relation of k and porosity：
Above-mentioned formula is 0≤θ in porosity span<It is monotropic function when 1, the k in above formula is segmented with infiltration coefficient and is inserted
Value function f (x, t) replaces, and solves above formula, that is, porosity function θ (x, t) along seepage direction and time change is obtained, so that can
Solidify the inhomogeneities of sand along the change of seepage direction porosity and nanogel to analyze.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710036481.5A CN106841033B (en) | 2017-01-18 | 2017-01-18 | Real-time testing device and method for PH value and porosity of nano-gel solidified sandy soil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710036481.5A CN106841033B (en) | 2017-01-18 | 2017-01-18 | Real-time testing device and method for PH value and porosity of nano-gel solidified sandy soil |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106841033A true CN106841033A (en) | 2017-06-13 |
| CN106841033B CN106841033B (en) | 2020-03-17 |
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|---|---|---|---|
| CN201710036481.5A Active CN106841033B (en) | 2017-01-18 | 2017-01-18 | Real-time testing device and method for PH value and porosity of nano-gel solidified sandy soil |
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| CN108801865A (en) * | 2018-05-31 | 2018-11-13 | 辽宁工程技术大学 | A kind of sand grains gradient fatigue liquefaction experimental provision and method |
| CN109030317A (en) * | 2018-09-05 | 2018-12-18 | 中山大学 | A kind of impervious material osmotic grouting laboratory testing rig |
| CN115235972A (en) * | 2022-07-11 | 2022-10-25 | 北京市地质灾害防治研究所 | Detection method for soil permeability coefficient |
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| Publication number | Publication date |
|---|---|
| CN106841033B (en) | 2020-03-17 |
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