CN112730195A - Precipitation fracture rock mass seepage-resistant experimental system based on induced calcium carbonate precipitation technology - Google Patents
Precipitation fracture rock mass seepage-resistant experimental system based on induced calcium carbonate precipitation technology Download PDFInfo
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- CN112730195A CN112730195A CN202011552725.3A CN202011552725A CN112730195A CN 112730195 A CN112730195 A CN 112730195A CN 202011552725 A CN202011552725 A CN 202011552725A CN 112730195 A CN112730195 A CN 112730195A
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- calcium carbonate
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- induced calcium
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- 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
Abstract
The invention discloses a precipitation fracture rock mass seepage-resisting experiment system based on an induced calcium carbonate precipitation technology, which comprises a precipitation reaction device, a peristaltic pump and a reaction liquid storage box, wherein the reaction liquid storage box is arranged in the precipitation reaction device; the precipitation reaction device comprises a support arranged on a base, a rock sample is fixed on each of the left side and the right side of the support, a water injection hole is formed in the middle of each rock sample in a corresponding position, after the rock samples are fixed on the support, the two rock samples are close to each other, the water injection holes are communicated with a reaction liquid storage tank through water pipes, and a flow meter and a peristaltic pump are arranged on the water pipes outside the precipitation reaction device; according to the method, the condition of calcium carbonate precipitation induced under the working condition of continuous water injection of the drill hole under the condition of flowing water is simulated by two rock samples with water injection holes, and the weakening effect of the calcium carbonate precipitation on the permeability of the cracks is judged according to the flow in the water pipe.
Description
Technical Field
The invention relates to a precipitation fracture rock mass seepage-resisting experimental system based on an induced calcium carbonate precipitation technology.
Background
The induced calcium carbonate precipitation method has the advantages of simple mechanism, high speed and efficiency, easy control and good environmental weather resistance, and the application in soil is developed to a certain extent. Current research induced calcium carbonate precipitation techniques focus on adjusting the parameters of induced calcium carbonate precipitation to promote levels of induced calcium carbonate precipitation.
The invention patent with application number 201821293734.3 discloses a test device for microorganism induced calcium carbonate precipitation solidification sandy soil under negative pressure environment, which improves the level of microorganism induced calcium carbonate precipitation promotion by adjusting air pressure, needs to perform stress test to evaluate the sand solidification effect, and has long experiment period and complex process.
Application No.: 201910105431.7 patent of invention 'a test device for microorganism solidified soil and test method' researches on improving the level of promoting microorganism to induce calcium carbonate precipitation by vacuum freeze drying condition, the final result evaluation needs to be carried out with compression test determination, and the test is also tedious.
In addition, the existing research method can not research the condition of calcium carbonate precipitation induced under the working condition of continuous water injection of the drill hole under the condition of flowing water.
Disclosure of Invention
The invention aims to solve the technical problem that the research method of the induced calcium carbonate precipitation technology in the prior art cannot comprehensively reflect the condition of induced calcium carbonate precipitation under the working condition of continuous water injection of a drill hole under the condition of flowing water, and overcomes the defects that the evaluation of the precipitation level needs to carry out a complicated compression test or stress test, and provides a precipitation fracture rock mass seepage-resisting experiment system based on the induced calcium carbonate precipitation technology.
In order to solve the technical problems, the invention provides the following technical scheme:
a precipitation fracture rock mass seepage-resistant experiment system based on an induced calcium carbonate precipitation technology comprises a precipitation reaction device, a peristaltic pump and a reaction liquid storage box;
the precipitation reaction device comprises a support arranged on a base, a rock sample is fixed on each of the left side and the right side of the support, a water injection hole is formed in the middle of each rock sample in a corresponding position, after the rock samples are fixed on the support, the two rock samples are close to each other, the water injection holes are communicated with a reaction liquid storage tank through water pipes, and a flow meter and a peristaltic pump are arranged on the water pipes outside the precipitation reaction device; the flow meter monitors the flow of water in the conduit.
The support can be formed by splicing a left half and a right half, and the two sides of the support are spliced and fixed by screws after a rock sample is fixed.
The water pressure in the water pipe is 0-0.2 Mpa, and the two sides of the support are spliced and fixed by screws after the rock sample is fixed.
Further, the reaction solution in the reaction solution storage tank comprises a mixed solution of calcium chloride, urea and soybean urease, and the concentrations are as follows: 0.3 to 2mol/L, 0.3 to 2mol/L and 30 to 300 g/L. In addition, the soybean urease can be replaced by other substances which can induce the precipitation of calcium carbonate, such as jack bean urease or sarcina pasteurii.
Different fracture widths can be simulated by placing a shim between the two rock samples. Preferably, the thickness of the gasket is 1-4 mm, and cracks with a gap width of 1-4 mm can be simulated.
And attaching fine sand on the surface of the rock sample to simulate different fracture roughness. Attaching with fine sand with different particle sizes, uniformly coating glue on the surface of the rock, and uniformly spraying the fine sand on the surface. The roughness after attachment was measured with a super-depth-of-field microscope.
In the experiment, the upper part and two sides of the bracket are sealed by adopting sealing strips so as to prevent the reaction liquid from overflowing.
Furthermore, a reaction liquid recovery box is arranged in the base, and reaction liquid injected into the water injection hole of the rock sample is collected in the reaction liquid recovery box through a water guide hole.
Further, the reaction liquid recovery tank is communicated with the reaction liquid storage tank through a water pipe.
According to the method, the condition of calcium carbonate precipitation induced under the working condition of continuous water injection of the drill hole under the condition of flowing water is simulated by two rock samples with water injection holes, and the weakening effect of the calcium carbonate precipitation on the permeability of the cracks is judged according to the flow in the water pipe.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural diagram of an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a rock sample in the example.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Examples
A precipitation fracture rock mass seepage-resistant experiment system based on an induced calcium carbonate precipitation technology comprises a precipitation reaction device, a peristaltic pump 6 and a reaction liquid storage box 5;
the precipitation reaction device comprises a support 1 arranged on a base 8, wherein a rock sample 2 is fixed on each of the left side and the right side of the support 1, a water injection hole 3 is formed in the middle of each rock sample 2 at a corresponding position, after the rock samples 3 are fixed on the support 1, the two rock samples 2 are close to each other, the water injection holes 3 are communicated with a reaction liquid storage tank 5 through a water pipe 4, and a flowmeter 10 and a peristaltic pump 6 are arranged on the water pipe 4 outside the precipitation reaction device; the diameter of the water injection hole 3 is about 1 cm.
The outside dimensions (length, width, height) of the bracket 1 are respectively as follows: 50cm, 6cm and 50cm, and the inner side dimensions (length, width and height) are respectively as follows: 40cm, 5cm and 40cm, and the sizes (length, width and height) of the samples are respectively as follows: the support 1 is provided with fixing holes 12 of 40cm, 5cm and 40cm, the fixing holes 12 are used for splicing and fixing the supports on two sides, and fixing pieces can be additionally arranged on the fixing holes to firmly fix the left support and the right support.
The support 1 is formed by the concatenation of the left and right halves of symmetry, and is fixed through set screw 7 after the concatenation, and the inboard four corners of every half support all is provided with the rock fixing plate of L type, presss from both sides between four L type rock fixing plates after the installation of rock sample, firmly fixes the rock. Dimensions (length, width, height) of the base 8: the height of the water guide hole is 10cm, the height of the water guide hole is 60cm, 15cm and 20cm, an interlayer is arranged, and the middle of the interlayer is provided with a water guide hole 15. And placing the reaction liquid recovery tank on the interlayer, customizing the sizes of the water tank to be 40cm, 5cm and 15cm, and arranging a water guide hole in the middle position of the bottom of the water tank to be connected with the water guide hole of the interlayer. The bracket is connected with the base through screws;
the reaction solution injected into the water injection holes of the rock sample is collected in the reaction solution recovery tank 11. The reaction liquid recovery box is communicated with the reaction liquid storage box through a water pipe. Square shims 14 of 3cm length and 1mm thickness were attached to the four corners of one of the rock samples, with the shim-attached side facing the other rock sample, thereby simulating a 1cm wide fracture. And attaching fine sand on the surface of the rock sample to simulate different fracture roughness. The change of the flow meter was observed by sticking no fine sand, and fine sand with particle diameters of 1mm and 1.5mm to the surface of the rock sample.
And sealing the upper part and two sides of the bracket by adopting sealing strips.
Draw out the continuous inflow water injection hole of reaction liquid through the peristaltic pump with different constant pressure in from the reaction liquid storage tank, the composition of reaction liquid is the mixed solution of calcium chloride, urea and soybean urease, the concentration is respectively: 0.8mol/L, 0.8mol/L and 100 g/L. Under the initial flow of difference, through 23 h's continuous injection, adopt the precipitation fracture rock mass of this embodiment to hinder under the different flowing water operating mode of experiment system simulation, under water injection pressure, rock fracture width and the crack roughness, the change of flowmeter is as shown in the following table:
as can be seen from the table, the size of the flowmeter of the fractured rock mass seepage-resisting experiment system can directly and qualitatively represent the weakening effect of calcium carbonate precipitation on fracture permeability. The smaller the flow becomes, the stronger the effect of the calcium carbonate precipitate on the impairment of fracture permeability and vice versa.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A precipitation fracture rock mass seepage-resistant experiment system based on an induced calcium carbonate precipitation technology is characterized by comprising a precipitation reaction device, a peristaltic pump and a reaction liquid storage tank;
precipitation reaction unit is including setting up the support on the base, and a rock sample is all fixed on both sides about the support, and the middle corresponding position of two rock samples is provided with the water injection hole, and the back on the support is fixed to the rock sample, and two rock samples are close to each other, and the water injection hole leads to pipe and reaction liquid storage box intercommunication, is provided with flowmeter and peristaltic pump on the outer water pipe of precipitation reaction unit.
2. The induced calcium carbonate precipitation technology-based fractured rock mass seepage-resisting experimental system as claimed in claim 1, wherein the support is formed by splicing a left half and a right half.
3. The induced calcium carbonate precipitation technology-based fractured rock mass seepage inhibition experiment system as claimed in claim 1, wherein the water pressure in the water pipe is 0-0.2 Mpa.
4. The induced calcium carbonate precipitation technology-based fractured rock mass seepage-resisting experiment system as claimed in claim 1, wherein the reaction liquid in the reaction liquid storage tank comprises mixed liquid of calcium chloride, urea and soybean urease, and the concentrations are as follows: 0.3 to 2mol/L, 0.3 to 2mol/L and 30 to 300 g/L.
5. The system for testing the permeability resistance of a fractured rock mass based on the induced calcium carbonate precipitation technology according to claim 1, wherein different fracture widths can be simulated by arranging a gasket between two rock samples.
6. The system for testing seepage resistance of fractured rock mass based on the induced calcium carbonate precipitation technology as claimed in claim 1, wherein fine sand is attached to the surface of the rock sample to simulate different fracture roughness.
7. The induced calcium carbonate precipitation technology-based fractured rock mass seepage inhibition experiment system as claimed in claim 1, wherein the upper part and two sides of the support are sealed by sealing strips.
8. The induced calcium carbonate precipitation technology-based fractured rock mass seepage-resisting experiment system as claimed in claim 1, wherein a reaction liquid recovery box is arranged in the base, and the reaction liquid injected into the water injection hole of the rock sample is collected in the reaction liquid recovery box through a water guide hole.
9. The induced calcium carbonate precipitation technology-based fractured rock mass seepage-resisting experimental system as claimed in claim 8, wherein the reaction liquid recovery tank is communicated with the reaction liquid storage tank through a water pipe.
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| CN202011552725.3A CN112730195B (en) | 2020-12-24 | 2020-12-24 | Fractured rock mass seepage-resistant experiment system based on induced calcium carbonate precipitation technology |
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| CN114592498A (en) * | 2022-03-30 | 2022-06-07 | 西安建筑科技大学 | Method for inducing calcium carbonate precipitation by combining plant urease with urease inhibitor |
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2020
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| US20200340021A1 (en) * | 2012-07-17 | 2020-10-29 | Edward KAVAZANJIAN | Cementation methods |
| CN105862706A (en) * | 2016-06-08 | 2016-08-17 | 东南大学 | Method for treating liquefiable sandy soil foundations by aid of microbial bubble |
| CN109030317A (en) * | 2018-09-05 | 2018-12-18 | 中山大学 | A kind of impervious material osmotic grouting laboratory testing rig |
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| CN114592498A (en) * | 2022-03-30 | 2022-06-07 | 西安建筑科技大学 | Method for inducing calcium carbonate precipitation by combining plant urease with urease inhibitor |
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