CN106841033B - Real-time testing device and method for PH value and porosity of nano-gel solidified sandy soil - Google Patents
Real-time testing device and method for PH value and porosity of nano-gel solidified sandy soil Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 37
- 238000012360 testing method Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 57
- 239000011148 porous material Substances 0.000 claims abstract description 34
- 229920001971 elastomer Polymers 0.000 claims abstract description 25
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000000465 moulding Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 12
- 239000004576 sand Substances 0.000 claims abstract description 12
- 238000012806 monitoring device Methods 0.000 claims abstract description 8
- 239000012528 membrane Substances 0.000 claims abstract description 7
- 238000002955 isolation Methods 0.000 claims abstract description 4
- 230000035699 permeability Effects 0.000 claims description 26
- 239000002184 metal Substances 0.000 claims description 11
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 9
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 9
- 241001330002 Bambuseae Species 0.000 claims description 9
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 9
- 239000011425 bamboo Substances 0.000 claims description 9
- 238000007493 shaping process Methods 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 7
- 239000013307 optical fiber Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- 239000002245 particle 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
- 238000010998 test method Methods 0.000 claims 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 10
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
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- 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
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- 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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Abstract
The invention discloses a device and a method for testing the PH value and the porosity of nano-gel solidified sandy soil along a seepage path in real time, wherein the device comprises a sample forming long cylinder, a monitoring device, a liquid collecting container, a water pressure controller and a pressure isolating device; placing a sand sample in the sample molding long cylinder; the monitoring device comprises n pore water pressure meters and a PH meter which are arranged in the sample forming long cylinder in a segmented manner; the pressure isolation device is isolated into two chambers by a rubber membrane, wherein one chamber is connected with a hydraulic pressure controller, and the other chamber is filled with silica sol and connected with a sample forming long cylinder; the water pressure controller, the pressure isolating device, the sample forming long cylinder and the liquid collecting container are sequentially connected. The invention overcomes the problems that the existing device is difficult to analyze the curing nonuniformity along the seepage path and cannot measure the pH value of the silica sol along the seepage path in real time and the porosity change of the sand during the curing process.
Description
Technical Field
The invention belongs to the field of geotechnical engineering research, and particularly relates to a device and a method for testing the pH value and the porosity of nano-gel solidified sandy soil along a seepage path in real time.
Background
The nano silica sol is a suspension of nano silica particles in water, the particles repel each other under an alkaline environment, and the suspension is a stable system. When the PH value is reduced to a certain range, the nano particles are gradually condensed into a chain structure to form gel with a three-dimensional network structure, the nano gel system can reinforce loose sandy soil foundations, and the reinforcing method is to seep silica sol into saturated sandy soil foundations. In the seepage process, the advancing interface of the silica sol is continuously pushed in the sand foundation, the PH values and the porosity reduced due to solidification at different positions on the seepage path are different, and the acquisition of the real-time PH values and the porosity at different positions on the seepage path is favorable for establishing a solidification theoretical model of the nano silica sol. However, the prior art cannot provide a real-time measurement result of the PH value of the silica sol on the seepage path and the porosity of the sand during the curing process, and is difficult to analyze the curing nonuniformity along the seepage direction, so that it is important to develop a device and a method for measuring the PH value and the porosity of the silica sol cured sand on the seepage path in real time.
Disclosure of Invention
The invention provides a device and a method for testing the pH value and the porosity of nano-gel solidified sandy soil along a seepage path in real time, aiming at overcoming the problems that the prior device can not measure the pH value of silica sol along the seepage path in real time and the porosity of sandy soil in the solidification process changes and the problem that the solidification nonuniformity along the seepage path is difficult to analyze.
The technical scheme of the invention is as follows: a real-time PH value and porosity testing device for nano-gel solidified sandy soil comprises a sample forming long cylinder, a monitoring device, a liquid collecting container, a water pressure controller and a pressure isolating device; placing a sand sample in the sample molding long cylinder; the monitoring device comprises n pore water pressure meters and a PH meter which are arranged in the sample forming long cylinder in a segmented manner; the pressure isolation device is isolated into two chambers by a rubber membrane, wherein one chamber is connected with a hydraulic pressure controller, and the other chamber is filled with silica sol and connected with a sample forming long cylinder; the water pressure controller, the pressure isolating device, the sample forming long cylinder and the liquid collecting container are sequentially connected.
Preferably, the sample forming long cylinder is a PVC cylindrical pipe with two open ends, the ratio of the height to the diameter is more than or equal to 10, the diameter is 100mm, the wall thickness is 6mm, and the height is 1 m.
Preferably, the PH meter is a fiber PH meter.
Preferably, the PH meters and the pore water pressure meters are equidistantly arranged on the inner wall of the sample forming long cylinder along the central axis of the sandy soil sample, the PH meters and the pore water pressure meters on the same horizontal plane are alternately arranged on the same vertical line by taking the central axis as a symmetry axis.
Preferably, the bottom of the sample forming long barrel is plugged with a first rubber plug, the top of the sample forming long barrel is plugged with a second rubber plug, and a metal filtering screen is placed on the first rubber plug to prevent the blockage of a silica sol inlet channel.
Preferably, a piece of permeable stone with a thickness of 5mm is placed on the metal filter screen so that the silica sol can be uniformly injected into the cross section of the sand sample.
A real-time PH value and porosity testing method for nanogel solidified sandy soil along a seepage path comprises the following steps:
step 1: sealing the bottom of the sample molding long cylinder by using a first rubber plug, placing a metal filter screen on the first rubber plug, placing a permeable stone on the metal filter screen, then placing a sandy soil sample into the sample molding long cylinder, arranging a pore water pressure gauge and an optical fiber PH gauge along the seepage direction of the sandy soil sample in the process of placing the sandy soil sample, and finally sealing the top of the sample molding long cylinder by using a second rubber plug;
step 2: the first chamber is connected with the water pressure controller and the pressure isolating device, the second chamber in the pressure isolating device is filled with silica sol, and then the second chamber and the sample forming long cylinder are connected, and the sample forming long cylinder and the liquid collecting container are connected;
and step 3: start hydraulic controller and exert pressure to the rubber membrane among the pressure isolating device, the reduction of the water volume in the hydraulic controller of real-time recording, combine the cross-sectional area of a sample shaping long section of thick bamboo, can obtain the velocity of flow V in the sample shaping long section of thick bamboo in real time, PH value and water pressure on each monitoring point of real-time recording simultaneously, it has n along the long section of thick bamboo length direction PH meter of sample shaping, the PH meter serial number of bottom is 1, from up the PH meter serial number increases in proper order down, top PH meter serial number is n, the real-time PH value that corresponds is A1(t),A2(t),Λ,An(t) the pH value between the ith pH meter and the (i + 1) th pH meter is represented by Ai(t) and Ai+1(t) linear interpolation;
and 4, step 4: calculating the permeability coefficient of the sample in real time in a segmented manner: n pore water pressure meters are arranged along the length direction of the sample forming long cylinder, the number of the pore water pressure meter at the bottom is 1, the pore water pressure meters sequentially increase from bottom to top, the number of the pore water pressure meter at the top is n, and the corresponding real-time pore water pressure is P1(t),P2(t),Λ,Pn(t) the sample-forming cylinder 1 is divided into n-1 sections by a pore water pressure gauge, and the permeation of each section isCoefficient of performance
Comprises the following steps:
in the above formula rhowThe water density, g the acceleration of gravity, and L the height of the sample forming cylinder.
And (3) solving the corresponding real-time permeability coefficient on each pore water pressure node i (i is more than or equal to 1 and less than or equal to n):
defining a permeability coefficient piecewise interpolation function f (x, t) along the central axis direction of the sample:
wherein L ═ L/(n-1), xlX-l (i-1), wherein l (i-1) is not less than x and not more than l. Obtaining the permeability coefficient of each point along the length direction of the sample by the permeability coefficient piecewise interpolation function f (x, t);
and 5: calculating a change curve theta (x, t) of the porosity along the length direction of the sample in real time: is provided with
Taking the average grain diameter of sand particles, theta is porosity, c is constant coefficient, and applying the functional relation between permeability coefficient k and porosity:
the formula is a single-value function when the porosity value range is theta <1 and is more than or equal to 0, k in the formula is replaced by a permeability coefficient piecewise interpolation function f (x, t), and the formula is solved to obtain the porosity function theta (x, t) which changes along the seepage direction and time, so that the change of the porosity along the seepage direction and the nonuniformity of the nano gel solidified sandy soil can be analyzed.
The invention has the beneficial effects that: the invention provides a device and a method for testing the pH value and the porosity of nano-gel solidified sandy soil along a seepage path in real time, which solve the problems that the pH value of silica sol on the seepage path and the porosity of sandy soil in the solidification process can not be measured in real time by the conventional device and the problem that the curing nonuniformity along the seepage path is difficult to analyze by the conventional device.
Drawings
FIG. 1 is an overall layout of the present invention;
FIG. 2 is a top view of a sample forming cylinder of the present invention;
FIG. 3 is a side view of a sample forming cylinder of the present invention.
In the figure, 1, a sample forming long cylinder, 2, a pore water pressure gauge, 3, a PH gauge, 4, a water pressure controller, 5, a pressure isolating device, 6, a liquid collecting container, 7, a first rubber plug, 8, a metal filtering screen, 9, a permeable stone, 10, a sand sample, 11, a rubber film, 12, a first chamber, 13, a second chamber and 14, a second rubber plug are arranged in the sample forming long cylinder.
Detailed Description
In order to make the technical means, innovative features, objectives and effects of the present invention apparent, the present invention will be further described with reference to the following detailed drawings.
The device for testing the PH value and the porosity of the nanogel solidified sandy soil along the seepage path in real time as shown in figure 1 comprises a sample forming long cylinder 1, a monitoring device, a liquid collecting container 6, a water pressure controller 4 and a pressure isolating device 5; placing a sand sample 10 in the sample molding long cylinder 1; the monitoring device comprises n pore water pressure meters 2 and a PH meter 3 which are arranged in a sample forming long cylinder 1 in a segmented manner; the pressure isolation device 5 is isolated into two chambers by a rubber membrane 11, wherein the first chamber 12 is connected with the hydraulic pressure controller 4, and the second chamber 13 is filled with silica sol and connected with the sample forming long cylinder 1; the water pressure controller 4, the pressure isolating device 5, the sample forming long cylinder 1 and the liquid collecting container 6 are connected in sequence.
The working process of the method for testing the PH value and the porosity of the nanogel solidified sandy soil along the seepage path in real time comprises the following steps:
step 1: sealing the bottom of the sample molding long barrel 1 by using a first rubber plug 7, placing a metal filter screen 8 on the first rubber plug 7, placing a permeable stone 9 on the metal filter screen 8, then placing a sandy soil sample 10 in the sample molding long barrel 1, arranging a pore water pressure gauge 2 and a PH gauge 3 along the seepage direction of the sandy soil sample in the process of placing the sandy soil sample 10, and finally sealing the top of the sample molding long barrel 1 by using a second rubber plug 14;
step 2: the first chamber 12 is connected with the hydraulic pressure controller 4 and the pressure isolating device 5, the second chamber 13 in the pressure isolating device 5 is filled with silica sol, then the second chamber 13 and the sample forming long cylinder 1 are connected, and the sample forming long cylinder 1 and the liquid collecting container 6 are connected;
and step 3: start water pressure controller 4 and exert pressure to rubber membrane 11 among the pressure isolating device, the reduction of the interior water yield of real-time recording water pressure controller 4, combine the cross-sectional area of sample shaping long section of thick bamboo 1, can obtain the velocity of flow V in the sample shaping long section of thick bamboo 1 in real time, simultaneously PH value and water pressure on each monitoring point of real-time recording, it has n to establish along 1 length direction PH meter of sample shaping long section of thick bamboo, the PH meter serial number of bottom is 1, from up the PH meter 3 serial number increases in proper order down, top PH meter serial number is n, the real-time PH value that corresponds is A1(t),A2(t),Λ,An(t) the pH value between the ith pH meter and the (i + 1) th pH meter is represented by Ai(t) and Ai+1(t) linear interpolation;
and 4, step 4: calculating the permeability coefficient of the sample in real time in a segmented manner: n pore water pressure meters are arranged along the length direction of the sample forming long cylinder 1, the number of the pore water pressure meter at the bottom is 1, the pore water pressure meters 2 are sequentially increased from bottom to top, the number of the pore water pressure meter at the top is n, and the corresponding real-time pore water pressure is P1(t),P2(t),Λ,Pn(t) the sample forming cylinder 1 is coveredThe pore water pressure gauge is divided into n-1 sections, and the permeability coefficient of each section
Comprises the following steps:
in the above formula rhowThe water density, g the acceleration of gravity, and L the height of the sample forming cylinder.
And (3) solving the corresponding real-time permeability coefficient on each pore water pressure node i (i is more than or equal to 1 and less than or equal to n):
defining a permeability coefficient piecewise interpolation function f (x, t) along the length direction of the sample:
wherein L ═ L/(n-1), xlX-l (i-1), wherein l (i-1) is not less than x and not more than l. Obtaining the permeability coefficient of each point along the length direction of the sample by the permeability coefficient piecewise interpolation function f (x, t);
and 5: calculating a change curve theta (x, t) of the porosity along the length direction of the sample in real time: is provided with
Taking the average grain diameter of sand particles, theta is porosity, c is constant coefficient, and applying the functional relation between permeability coefficient k and porosity:
the formula is a single-value function when the porosity value range is theta <1 and is more than or equal to 0, k in the formula is replaced by a permeability coefficient piecewise interpolation function f (x, t), and the formula is solved to obtain the porosity function theta (x, t) which changes along the seepage direction and time, so that the change of the porosity along the seepage direction and the nonuniformity of the nano gel solidified sandy soil can be analyzed.
Claims (6)
1. A test method of a PH value and porosity real-time test device of nano-gel solidified sandy soil comprises the PH value and porosity real-time test device of the nano-gel solidified sandy soil, and the real-time test device is provided with:
the device comprises a sample forming long cylinder, a monitoring device, a liquid collecting container, a water pressure controller and a pressure isolating device; placing a sandy soil sample in the sample molding long cylinder; the monitoring device comprises n pore water pressure meters and an optical fiber PH meter which are arranged in the sample forming long cylinder in a segmented manner; the pressure isolation device is isolated into two chambers by a rubber membrane, wherein one chamber is connected with a hydraulic pressure controller, and the other chamber is filled with silica sol and connected with a sample forming long cylinder; the water pressure controller, the pressure isolating device, the sample forming long cylinder and the liquid collecting container are sequentially connected; a first rubber plug is plugged at the bottom of the sample forming long cylinder, a second rubber plug is plugged at the top of the sample forming long cylinder, and a metal filter screen is placed on the first rubber plug to prevent a silica sol inlet channel from being blocked;
the method is characterized in that: the test method comprises the following steps:
step 1: sealing the bottom of the sample molding long cylinder by using a first rubber plug, placing a metal filter screen on the first rubber plug, placing a permeable stone on the metal filter screen, then placing a sandy soil sample into the sample molding long cylinder, arranging a pore water pressure gauge and an optical fiber PH gauge along the seepage direction of the sandy soil sample in the process of placing the sandy soil sample, and finally sealing the top of the sample molding long cylinder by using a second rubber plug;
step 2: the first chamber is connected with the water pressure controller and the pressure isolating device, the second chamber in the pressure isolating device is filled with silica sol, and then the second chamber and the sample forming long cylinder are connected, and the sample forming long cylinder and the liquid collecting container are connected;
and step 3: start hydraulic controller and exert pressure to the rubber membrane among the pressure isolating device, the reduction of the water volume in the hydraulic controller of real-time recording, combine the cross-sectional area of a sample shaping long section of thick bamboo, obtain the velocity of flow V in the sample shaping long section of thick bamboo in real time, simultaneously PH value and water pressure on each monitoring point of real-time recording, it has n along the long section of thick bamboo length direction optic fibre PH meter of sample shaping, the optic fibre PH meter serial number of bottom is 1, from up optic fibre PH meter serial number increases in proper order down, top optic fibre PH meter serial number is n, the real-time PH value that corresponds is A1(t),A2(t),…,An(t) the pH between the ith fiber pH meter and the (i + 1) th fiber pH meter is represented by Ai(t) and Ai+1(t) linear interpolation;
and 4, step 4: calculating the permeability coefficient of the sample in real time in a segmented manner and obtaining a permeability coefficient segmented interpolation function f (x, t);
and 5: and calculating a change curve of the porosity along the length direction of the sample in real time, and calculating the porosity theta (x, t) according to a function relation between the permeability coefficient and the porosity and a permeability coefficient piecewise interpolation function f (x, t).
2. The method for testing the PH value and the porosity of the nanogel solidified sandy soil in real time as claimed in claim 1, wherein the method comprises the following steps:
in the step 4, n pore water pressure meters are arranged along the length direction of the sample forming long cylinder, the number of the pore water pressure meter at the bottom is 1, the pore water pressure meters sequentially increase from bottom to top, the number of the pore water pressure meter at the top is n, and the corresponding real-time pore water pressure is P1(t),P2(t),…,Pn(t) dividing the sample forming long cylinder into n-1 sections by a pore water pressure gauge, wherein the permeability coefficient of each section
Comprises the following steps:
in the above formula rhowThe water density is adopted, g is the gravity acceleration, and L is the height of the sample molding long cylinder;
and (3) solving the corresponding real-time permeability coefficient on each pore water pressure node i (i is more than or equal to 1 and less than or equal to n):
defining a permeability coefficient piecewise interpolation function f (x, t) along the central axis direction of the sample:
wherein L ═ L/(n-1), xlX is not less than x and not more than l.i (i-1); and (3) obtaining the permeability coefficient of each point along the length direction of the sample by the permeability coefficient piecewise interpolation function f (x, t).
3. The testing method of the device for testing the PH value and the porosity of the nanogel cured sandy soil in real time according to claim 1 is characterized in that:
in step 5, let
Taking the average grain diameter of sand particles, theta is porosity, c is constant coefficient, and applying the functional relation between permeability coefficient k and porosity:
the formula is a single-value function when the value range of the porosity is theta <1 and is more than or equal to 0, k in the formula is replaced by a permeability coefficient piecewise interpolation function f (x, t), and the formula is solved to obtain the porosity theta (x, t) which changes along the seepage direction and time, so that the change of the porosity along the seepage direction and the nonuniformity of the nano-gel solidified sandy soil are analyzed.
4. The testing method of the device for testing the PH value and the porosity of the nanogel cured sandy soil in real time according to claim 1 is characterized in that:
the sample forming long cylinder is a PVC cylindrical pipe with two open ends, and the ratio of the height to the diameter is more than or equal to 10.
5. The testing method of the device for testing the PH value and the porosity of the nanogel cured sandy soil in real time according to claim 1 is characterized in that: the optical fiber PH meter and the pore water pressure meter are arranged on the inner wall of the sample forming long cylinder at equal intervals along the central axis of the sandy soil sample, the optical fiber PH meter and the pore water pressure meter on the same horizontal plane use the central axis as a symmetry axis, and the optical fiber PH meter and the pore water pressure meter are alternately arranged on the same vertical line.
6. The testing method of the device for testing the PH value and the porosity of the nanogel cured sandy soil in real time according to claim 1 is characterized in that:
a piece of permeable stone with the thickness of 5mm is placed on the metal filter screen, so that the silica sol can be uniformly injected into the cross section of the sandy soil sample.
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