CN107894392B - Research system and method for anchoring corrosion mechanism of anchored jointed rock mass under seawater corrosion - Google Patents
Research system and method for anchoring corrosion mechanism of anchored jointed rock mass under seawater corrosion Download PDFInfo
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- 230000007797 corrosion Effects 0.000 title claims abstract description 100
- 238000005260 corrosion Methods 0.000 title claims abstract description 100
- 239000011435 rock Substances 0.000 title claims abstract description 81
- 238000004873 anchoring Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000013535 sea water Substances 0.000 title claims abstract description 28
- 230000007246 mechanism Effects 0.000 title claims abstract description 23
- 238000011160 research Methods 0.000 title claims abstract description 18
- 238000012360 testing method Methods 0.000 claims abstract description 90
- 238000002474 experimental method Methods 0.000 claims abstract description 23
- 238000002360 preparation method Methods 0.000 claims abstract description 22
- 230000008569 process Effects 0.000 claims abstract description 20
- 230000006835 compression Effects 0.000 claims abstract description 13
- 238000007906 compression Methods 0.000 claims abstract description 13
- 238000004458 analytical method Methods 0.000 claims abstract description 11
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- 238000006243 chemical reaction Methods 0.000 claims description 26
- 238000006073 displacement reaction Methods 0.000 claims description 18
- 238000012544 monitoring process Methods 0.000 claims description 15
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 8
- 238000005336 cracking Methods 0.000 claims description 8
- 230000007774 longterm Effects 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
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- 238000005516 engineering process Methods 0.000 claims description 7
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
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- 238000003487 electrochemical reaction Methods 0.000 claims description 5
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- 238000010183 spectrum analysis Methods 0.000 claims description 4
- 238000005303 weighing Methods 0.000 claims description 4
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- 238000010835 comparative analysis Methods 0.000 claims description 3
- 239000011521 glass Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 239000012466 permeate Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 description 8
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/02—Electrochemical measuring systems for weathering, corrosion or corrosion-protection measurement
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- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- G01N2203/0019—Compressive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
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Abstract
The application discloses a research system and a method for an anchoring corrosion mechanism of an anchoring jointed rock body under seawater corrosion, comprising a model preparation system, an accelerated corrosion system, a mechanical experiment system, a data acquisition and analysis system and a submarine tunnel similar model test system of the anchoring jointed rock body, wherein the model preparation system is used for preparing an anchoring jointed rock body model test piece under similar model conditions; the accelerated corrosion system performs electrochemical corrosion on the anchored jointed rock mass model test piece, and the numerical relation of corrosion voltage, current and time is measured through the system; the mechanical experiment system is used for carrying out triaxial compression penetration full-damage process test on the anchored joint rock mass model test piece before and after corrosion; the data acquisition and analysis system is used for acquiring related mechanical parameters and carrying out data comparison analysis; the anchoring rock submarine tunnel similarity model test system is used for comprehensively researching an anchoring corrosion damage mechanism in the corrosion process of the anchoring jointed rock under a complex stress state.
Description
Technical Field
The application relates to a research system and a method for an anchoring corrosion mechanism of an anchored jointed rock mass under seawater corrosion.
Background
With the continuous development of underground traffic, submarine tunnels gradually become a common underground engineering. The anchoring structure is indispensable to the submarine tunnel, people pay high attention to the durability of the anchoring structure in the design stage, but the complexity of the jointed rock body and the knowledge of the corrosion damage evolution action mechanism of the anchoring structure are insufficient, the reinforcement design still stays on the level of the empirical design, how to correctly analyze the stress, corrosion, seepage and coupling action effects of the seawater on the jointed rock body anchoring structure, fully know the corrosion damage evolution mechanism of the jointed rock body anchoring, provide the support parameters for reasonably reinforcing the submarine tunnel jointed rock body, avoid the cracking or collapse of the submarine tunnel lining structure caused by the premature failure of the anchoring support structure, and are the key problems of the current submarine tunnel jointed rock body cloth anchoring optimization design, and the research of the damage mechanism becomes particularly important.
Aiming at the problems, a research method of an anchoring rust erosion damage evolution mechanism of the submarine tunnel anchoring jointed rock mass under the long-term corrosion of seawater is needed.
Disclosure of Invention
The application aims to provide a research system and a method for an anchoring corrosion damage mechanism in a relatively comprehensive anchor joint rock corrosion process, which can provide related parameters and theoretical support of the durability of an anchoring structure for a submarine tunnel in a design stage and a use stage.
The technical scheme adopted by the application is as follows:
a research system for an anchoring corrosion damage evolution mechanism of a submarine tunnel anchoring jointed rock mass under the long-term corrosion of sea water, which comprises a model preparation system, an accelerated corrosion system, a mechanical experiment system, a data acquisition analysis system and a submarine tunnel similarity model test system of the anchoring rock mass,
the model preparation system is used for preparing an anchored jointed rock mass model test piece under similar model conditions;
the accelerated corrosion system performs electrochemical corrosion on the anchored jointed rock mass model test piece, and the numerical relation of corrosion voltage, current and time is measured through the system;
the mechanical experiment system is used for carrying out triaxial compression penetration full-damage process test on the anchored joint rock mass model test piece before and after corrosion;
the data acquisition and analysis system is used for acquiring related mechanical parameters and carrying out data comparison analysis;
the anchoring rock submarine tunnel similarity model test system is used for comprehensively researching an anchoring corrosion damage mechanism in the corrosion process of the anchoring jointed rock under a complex stress state.
Further, the model preparation system mainly comprises a groove-shaped structure consisting of a bottom steel plate, a front steel plate, a rear steel plate, a left steel plate and a right steel plate, wherein grooves which form a certain angle with the bottom surface and have a height which is half of the height of the plate are formed in the left steel plate and the right steel plate, and stainless steel plates are inserted into the grooves; the front steel plate is provided with a hole for inserting an anchor bar.
Preferably, the inserting angle of the steel sheet is 45 degrees, joint is simulated, grooves for connecting the front steel sheet and the rear steel sheet are formed in the left steel sheet and the right steel sheet, and holes are formed in the front steel sheet for inserting anchoring steel bars; the five steel plates are tightly connected with adjusting screws through screws so that the model is regular.
In the preparation process, the joint surface angle is simulated by a 45-degree surface, a smooth stainless steel sheet is inserted into the groove, the stainless steel sheet is pulled out after the test piece is solidified and demoulded, and the preparation is completed, preferably, the maintenance time is 7 days.
Further, the accelerated corrosion system comprises an electrochemical reaction station, a reaction chamber and a data display; the reaction chamber comprises a chamber I, a chamber II and a chamber III, the three reaction chambers are relatively independent, the concentration of chloride ions in different reaction chambers is different, the electrochemical reaction station can monitor current and voltage conditions in real time, meanwhile, corrosion data can be obtained by utilizing Faraday's law, and the data display can display monitoring data in real time.
And the reaction chamber is provided with an acoustic emission device, a grating conduction device and a CT real-time scanning device, and the acoustic emission device, the grating conduction device and the CT real-time scanning device are used for detecting the initial stress occurrence time, the initial cracking time and the critical time from crack expansion to jointed rock mass. And then selecting samples at different times, cleaning, weighing, adopting electron microscope scanning and X-ray fluorescence spectrum analysis, and establishing corrosion different corrosivity and chloride ion concentration and corrosion time calibration relation research.
The mechanical experiment system is a conventional triaxial experiment system.
The application also provides a research method for carrying out the anchoring corrosion damage evolution mechanism of the submarine tunnel anchoring jointed rock mass under the long-term corrosion of seawater by using the system, which is characterized by comprising the following steps of: the method comprises the following steps:
step 1: measuring related parameters of rock mass mechanics in a laboratory, preparing a model test piece of the anchored and conditioned rock mass under the condition of a model similarity ratio, and maintaining;
step 2: placing the model test piece in different reaction chambers to perform electrochemical accelerated corrosion, measuring relevant parameters such as voltage, current and the like, obtaining corrosion amount data by utilizing Faraday law, and displaying monitoring data in real time by a data display;
step 3: taking out a model test piece placed in a reaction chamber, performing triaxial compression permeation experiments, selecting different confining pressures and permeation pressures, simultaneously developing corresponding non-corroded anchored rock mass experiments, and performing comparative analysis on experimental results;
step 4: and after the test is finished, carrying out a submarine tunnel similar model test of the anchored joint rock mass, applying seawater with certain pressure on the top of a model test box, embedding a multipoint displacement meter, a miniature pressure sensor, a miniature osmometer and an optical fiber sensor in the model, and monitoring the changes of a displacement field, a stress field and a seepage field under the corrosion influence of the anchored joint region in the experimental process.
Further, rock mechanical parameters should be measured in a laboratory before a model preparation system prepares a test piece, and the geometric similarity ratio C of the experimental model is utilized 1 Volume weight similarity ratio C Y According to the intensity similarity ratio C R ＝C 1 ×C Y Modulus of elasticity similar to ratio C E ＝C 1 ×C Y Test pieces were prepared and numbered, and the raw material blend ratio was calculated.
Furthermore, in the test piece preparation process, an anchor environment is simulated on site, cement, sand, water and an additive are used as materials, a similar model test piece is prepared by adjusting the mixing proportion, and the rock mass strength is actually measured on site; preferably, the mixing proportion is selected as follows: sand: water = 1:2.34:0.35; the main proportion of sand is different according to the grain diameter; preferably, the ratio is taken as 10-20 mesh: 20-40 mesh: 40-70 mesh: 70-120 mesh = 53.3%:26.7%:13.3%:6.7%; the water reducing agent is taken as 2% of the total amount; in the test piece, the steel bar is used as an anchor rod to simulate an anchor adding condition.
Further, in the step 4, a model test system similar to a submarine tunnel with an anchored rock body is adopted for the test, the model test mainly comprises a model frame, a similar model grouting body, a manual excavation process and a supporting structure, wherein the periphery of the model frame is made of toughened transparent glass, one surface of the model frame is provided with a hole for starting manual excavation, a preset joint surface is positioned in the grouting body, a container filled with seawater is arranged at the top of the model test, seawater with certain pressure can be injected into the grouting body from the top, the seawater permeates into the grouting body along the joint surface to create a corrosion environment, and monitoring elements including but not limited to a multipoint displacement meter, a miniature pressure sensor, a miniature osmometer and an optical fiber sensor are embedded in the grouting body; the method comprises the steps of starting an experiment, manually simulating to excavate in a grouting body and carrying out anchor bolt support, setting an anchor bolt as an anode after the support is completed, setting a multipoint displacement meter as a cathode, connecting the anchor bolt and the multipoint displacement meter to an electrochemical station to carry out electrochemical accelerated corrosion, and monitoring the displacement field, stress field and seepage field change conditions under the influence of corrosion of an anchor joint area in the experiment process of accelerated corrosion.
Further, the section of the steel bar anchoring end of the anchoring joint rock mass simulation test piece, which is longer than the test piece, is cut off before the triaxial compression penetration test, the triaxial compression test is improved when the triaxial compression test is carried out, the original pressure end is directly contacted with the pressed test piece, and the pressure end is placed on the pressure contact surface steel plate by utilizing the force transmission principle when the triaxial compression penetration test is carried out, so that the uniform compression of the test piece can be realized.
Further, the reaction chamber detects the initial stress occurrence time, the initial cracking time and the critical time from crack expansion to jointed rock mass by utilizing acoustic emission technology, grating conduction technology and CT real-time scanning. And (3) selecting samples at different times, cleaning, weighing, adopting electron microscope scanning and X-ray fluorescence spectrum analysis, and establishing corrosion different corrosivity and chloride ion concentration and corrosion time calibration relation research. The working principle of the application is as follows:
according to the application, a steel mould is used for preparing an anchor-added jointed rock model test piece under similar model conditions, the concentration of chloride ions is regulated, the numerical relation between the corrosion degree of the anchor-added jointed rock, the concentration of the chloride ions and the corrosion time is researched by utilizing the numerical relation between the measured corrosion voltage, current and time under the accelerated corrosion environment action of an electrochemical station, then a triaxial compression penetration full-damage process test is carried out after the anchor-added test piece is processed, a data acquisition system is used for acquiring relevant mechanical parameters, and further, a data comparison analysis is carried out by utilizing the indoor similar model test of the anchor-added rock submarine tunnel and a field test, so that the research on the anchor corrosion damage mechanism in the corrosion process of the anchor-added jointed rock under the complex stress state is relatively comprehensively studied.
The beneficial effects of the application are as follows:
1) The preparation of the similar model time simulates the development state of the rock mass joint in the real environment, is an innovation of the experiment, and the similar model can be convenient for carrying out the experiment on the premise of keeping the relative accuracy of the related mechanical parameters such as the rock mass strength, the elastic modulus and the like.
2) Based on the electrochemical corrosion principle and Faraday's law, the initial stress occurrence time, the initial cracking time and the critical time for crack propagation to the jointed rock mass in the anchoring and corrosion process of the anchored jointed rock mass are monitored by using an optical fiber sensing technology, an acoustic emission technology, CT scanning and the like, the corrosion state corresponding to three time nodes is identified, and the estimated corrosion amount is characterized and innovated.
3) The relevant mechanical parameters of the early stage, the middle stage and the later stage of corrosion can be monitored in real time through the test, and the failure criterion of the anchoring corrosion damage of the submarine tunnel anchoring joint rock mass under the long-term corrosion of seawater and the empirical formula thereof can be provided.
4) The method can be used for analyzing the numerical method of the anchoring corrosion damage of the submarine tunnel anchoring joint rock mass under the long-term corrosion action of seawater by comparing the similar model test of the submarine tunnel with the anchoring rock mass with the field test.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application.
FIG. 1 is a flow chart of operation;
FIG. 2 is a perspective view of a simulated anchored rock mass specimen preparation device;
FIG. 3 is a perspective view of a triaxial compression permeation test;
FIG. 4 is a perspective view of an accelerated corrosion workflow for an electrochemical station;
FIG. 5 is a plan view of a simulation model test of a submarine tunnel with an anchored rock mass.
Wherein 2-1 is an anchor bar, 2-2 is a positioning bolt rod, 2-3 is a nut, 2-4 is a left-placed steel plate, 2-5 is a rear-placed steel plate, 2-6 is a right-placed steel plate, 2-7 is a bottom steel plate, 2-8 is a front-placed steel plate, and 2-9 is a stainless steel plate; 3-1 is a pressure display, 3-2 is a pressure control wheel, 3-3 is a triaxial tester, 3-4 is a pressure contact plate, 3-5 is a pressure chamber, 3-6 is a base, 3-7 is a data line, and 3-8 is a data display; 4-1 is an acoustic emission device, 4-2 is a grating conduction device, 4-3 is a CT real-time scanning device, 4-4 is an anchored steel bar, 4-5 is a reaction chamber I, 4-6 is a reaction chamber II, 4-7 is a reaction chamber III, 4-8 is an electrochemical station, and 4-9 is an electrochemical station monitoring display; 5-1 is an anchor rod, 5-2 is a multipoint displacement meter, and 5-3 is a reserved joint surface.
Specific implementation steps
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
As introduced by the background technology, the complexity of the jointed rock body and the understanding of the corrosion damage evolution action mechanism of the anchoring structure are insufficient in the prior art, the reinforcement design still stays on the layer surface of the empirical design, how to accurately analyze the stress, corrosion, seepage and coupling action effect of the seawater on the anchoring structure of the jointed rock body, the anchoring corrosion damage evolution mechanism of the jointed rock body is fully known, the support parameters of the jointed rock body of the submarine tunnel are reasonably reinforced, the cracking or collapse of the lining structure of the submarine tunnel caused by the premature failure of the anchoring support structure is avoided, the key problem of the optimization design of the anchoring structure of the current submarine tunnel jointed rock body is particularly important, and the research on the damage mechanism becomes particularly important.
The application is further described below with reference to the drawings and examples.
A research method of an anchoring corrosion damage evolution mechanism of a submarine tunnel anchoring jointed rock mass under the condition of long-term seawater corrosion comprises a model preparation system figure 2, an accelerated corrosion system figure 4, a mechanical experiment system figure 3, a data acquisition analysis system and an anchoring rock mass submarine tunnel similar model test system figure 5.
The model preparation system mainly comprises five separated steel plates, wherein the five separated steel plates comprise a bottom steel plate 2-7, a front steel plate 2-8, a rear steel plate 2-5, a left steel plate 2-4 and a right steel plate 2-6, grooves which are 45 degrees with the bottom surface and half of the height of the plates are arranged on the left steel plate and the right steel plate and are used for inserting stainless steel plates 2-9, joint is simulated, grooves for connecting the front steel plate and the rear steel plate are also arranged on the left steel plate and the right steel plate, holes are formed in the front steel plate and used for inserting anchor bars 2-1, and the five steel plates are tightly connected through screws.
The accelerated corrosion system includes electrochemical stations 4-8, reaction chambers, and electrochemical station monitor displays 5-9. The reaction chamber comprises a chamber I4-5, a chamber II 4-6 and a chamber III 4-7, the three reaction chambers are relatively independent and different in reaction chamber Cl - The electrochemical reaction station can monitor current and voltage conditions in real time and can obtain corrosion by utilizing Faraday lawThe data display can display the monitoring data in real time.
The reaction chamber comprises an acoustic emission device 4-1, a grating conduction device 4-2 and a CT real-time scanning device 4-3, and is used for detecting the initial stress occurrence time, the initial cracking time and the critical time from crack expansion to jointed rock mass of a test piece. And then selecting samples at different times, cleaning, weighing, adopting electron microscope scanning and X-ray fluorescence spectrum analysis, and establishing corrosion different corrosivity and chloride ion concentration and corrosion time calibration relation research.
The mechanical experiment system relates to a triaxial compression penetration test of an anchor test piece. The section of the steel bar anchoring end of the anchoring joint rock mass simulation test piece, which is longer than the test piece, is cut off before the test, when the triaxial compression test is carried out, the triaxial compression test is improved, the original pressure end is directly contacted with the pressed test piece, when the test is carried out, the pressure chamber ensures the stability of the test piece in the pressing process, the pressure end is arranged on the pressure contact surface steel plate 3-4 by utilizing the force transmission principle, and the uniform compression of the test piece can be realized.
The model test system mainly comprises a model frame, a similar model grouting body, a manual excavation process and a supporting structure, wherein the periphery of the model frame is made of toughened transparent glass, a hole for starting manual excavation is formed in one surface of the model frame, a preset joint surface is positioned in the grouting body, a container filled with seawater is arranged at the top of the model test, seawater with certain pressure can be injected into the grouting body from the top, the seawater permeates into the grouting body along the joint surface to create a corrosion environment, monitoring elements such as a multipoint displacement meter, a miniature pressure sensor, a miniature osmometer and an optical fiber sensor are embedded in the grouting body, the experiment is started, the manual simulation is performed in the grouting body to excavate and support an anchor rod, after the support is completed, the anchor rod is set to be an anode, the multipoint displacement meter is set to be a cathode, and the anchor rod is connected to an electrochemical station to perform electrochemical acceleration corrosion, so that the displacement field, the seepage field and the flow field change condition under the stress influence of the anchor joint region corrosion are monitored in the experimental process of acceleration corrosion.
The method for researching the anchor corrosion damage development mechanism of the submarine tunnel anchor joint rock mass under the long-term corrosion of seawater is described in detail as follows:
step 1: and measuring related parameters of rock mechanics in a laboratory, preparing a model test piece of the anchored and managed rock mass under the condition of a model similarity ratio, and maintaining.
The rock mechanical parameters should be measured in a laboratory before a model preparation system prepares a test piece, and the geometric similarity ratio C of the experimental model is utilized 1 Volume weight similarity ratio C Y According to the intensity similarity ratio C R ＝C 1 ×C Y Modulus of elasticity similarity C E ＝C 1 ×C Y Test pieces were prepared and numbered, and the raw material blend ratio was calculated.
Simulating an on-site anchor environment in the test piece preparation process, preparing a similar model test piece by taking cement, sand, water and an additive as materials through adjusting a mixing ratio, and actually measuring the rock mass strength according to the on-site; preferably, the mixing proportion is selected as cement: sand: water = 1:2.34:0.35; the main proportion of sand is different according to the grain diameter; preferably, the ratio is taken as 10-20 mesh: 20-40 mesh: 40-70 mesh: 70-120 mesh = 53.3%:26.7%:13.3%:6.7%; the water reducing agent is taken as 2% of the total amount; in the test piece, the steel bar is used as an anchor rod to simulate an anchor adding condition.
In the preparation process, the joint surface angle is simulated by a 45-degree surface, a smooth stainless steel sheet is inserted into the groove, the stainless steel sheet is pulled out after the test piece is solidified and demoulded, and the preparation is completed, preferably, the maintenance time is 7 days.
Step 2: and placing the model test piece in different reaction chambers to perform electrochemical accelerated corrosion, measuring relevant parameters such as voltage, current and the like, obtaining corrosion amount data by utilizing Faraday's law, and displaying monitoring data in real time by a data display.
Step 3: and taking out the model test piece placed in the reaction chamber, performing triaxial compression permeation experiments, selecting different confining pressures and permeation pressures, simultaneously performing corresponding non-corroded anchored rock mass experiments, and performing comparative analysis on experimental results.
Step 4: and after the test is finished, carrying out a submarine tunnel similar model test of the anchor joint rock mass, applying seawater with certain pressure at the top of the model test, embedding a multipoint displacement meter, a miniature pressure sensor, a miniature osmometer and an optical fiber sensor in the model, and monitoring the changes of a displacement field, a stress field and a seepage field under the corrosion influence of the anchor joint region in the experimental process.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (7)
1. A method for researching a system of anchoring corrosion mechanism of an anchoring jointed rock body under seawater corrosion adopts a research system of anchoring corrosion mechanism of the anchoring jointed rock body under seawater corrosion, the system comprises a model preparation system, an accelerated corrosion system, a mechanical experiment system, a data acquisition analysis system and a submarine tunnel similar model experiment system of the anchoring rock body,
the model preparation system is used for preparing an anchored jointed rock mass model test piece under similar model conditions;
the accelerated corrosion system performs electrochemical corrosion on the anchored jointed rock mass model test piece, and the numerical relation of corrosion voltage, current and time is measured through the system;
the mechanical experiment system is used for carrying out triaxial compression penetration full-damage process test on the anchored joint rock mass model test piece before and after corrosion;
the data acquisition and analysis system is used for acquiring related mechanical parameters and carrying out data comparison analysis;
the anchoring rock submarine tunnel similarity model test system is used for comprehensively researching an anchoring corrosion damage mechanism in the corrosion process of the anchoring jointed rock under a complex stress state;
the research system is used for researching an anchoring corrosion damage evolution mechanism of the submarine tunnel anchoring jointed rock mass under the long-term corrosion of seawater, and is characterized in that:
the method comprises the following steps:
step 1: measuring related parameters of rock mechanics in a laboratory, preparing a model test piece of the anchored joint rock mass under the condition of a model similarity ratio, and maintaining;
the method is characterized in that rock mechanical parameters are measured in a laboratory before a model preparation system prepares a test piece, the test piece is prepared and numbered by utilizing the geometric similarity ratio C1 and the volume weight similarity ratio CY of an experimental model, and the raw material mixing ratio is calculated according to the intensity similarity ratio CR=C1×CY and the elastic modulus similarity ratio CE=C1×CY;
the method is characterized in that an anchor environment is simulated on site in the preparation process of the test piece, cement, sand, water and additives are used as materials, a similar model test piece is prepared by adjusting the mixing ratio, and steel bars are used as anchor rods in the test piece to simulate the anchor adding condition;
step 2: placing the model test piece in different reaction chambers to perform electrochemical accelerated corrosion, measuring relevant parameters of voltage and current, obtaining corrosion amount data by utilizing Faraday law, and displaying monitoring data in real time by a data display;
step 3: taking out a model test piece placed in a reaction chamber, performing triaxial compression permeation experiments, selecting different confining pressures and permeation pressures, simultaneously performing corresponding non-corroded anchored rock mass experiments, and performing comparative analysis on experimental results;
step 4: and (3) performing a submarine tunnel similar model test of the anchor joint rock mass, applying seawater with certain pressure on the top of a model test box, embedding a multipoint displacement meter, a miniature pressure sensor, a miniature osmometer and an optical fiber sensor in the model, and monitoring the changes of a displacement field, a stress field and a seepage field under the corrosion influence of the anchor joint region in the experimental process.
2. The method of claim 1, wherein the mold preparation system is a trough-like structure consisting essentially of a bottom steel plate, a front steel plate, a rear steel plate, a left steel plate, and a right steel plate, wherein the left and right steel plates have grooves formed therein at an angle to the bottom surface and having a height half the height of the plate, and wherein stainless steel plates are inserted into the grooves; the front steel plate is provided with an opening for inserting the anchoring steel bar.
3. The method of claim 2, wherein the insert angle of the steel sheet is selected to be 45 ° to the simulated joint.
4. The method of claim 1, wherein the accelerated corrosion system comprises an electrochemical reaction station, a reaction chamber, a data display; the reaction chamber comprises a chamber I, a chamber II and a chamber III, the three reaction chambers are relatively independent, the concentration of chloride ions in different reaction chambers is different, the electrochemical reaction station can monitor the current and voltage conditions in real time, meanwhile, corrosion data can be obtained by utilizing Faraday's law, and the data display can display the monitoring data in real time.
5. The method of claim 4, wherein the reaction chamber is provided with an acoustic emission device, a grating conduction device and a CT real-time scanning device for detecting the initial stress occurrence time, the initial cracking time and the critical time from crack expansion to jointed rock mass of the test piece.
6. The method of claim 1, wherein in step 4, a model test system similar to a submarine tunnel with an anchored rock body is adopted for the test, the model test mainly comprises a model frame, a similar model grouting body, a manual excavation process and a supporting structure, wherein the periphery of the model frame is toughened transparent glass, one surface of the model frame is provided with holes at the beginning of the manual excavation, a preset joint surface is positioned in the grouting body, a container filled with seawater is arranged at the top of the model test, the grouting body can be filled with seawater with a certain pressure from the top, the seawater permeates into the grouting body along the joint surface to create a corrosion environment, and monitoring elements including but not limited to a multipoint displacement meter, a miniature pressure sensor, a miniature osmometer and an optical fiber sensor are embedded in the grouting body; the method comprises the steps of starting an experiment, manually simulating to excavate in a grouting body and carrying out anchor bolt support, after the support is completed, setting an anchor bolt as an anode, setting a multipoint displacement meter as a cathode, connecting the anchor bolt and the multipoint displacement meter to an electrochemical station to carry out electrochemical accelerated corrosion, and monitoring the displacement field, stress field and seepage field change conditions under the corrosion influence of an anchor joint area in the experimental process of the accelerated corrosion.
7. The method of claim 1, wherein the reaction chamber utilizes acoustic emission technology, grating conduction technology and CT real-time scanning to detect the initial stress occurrence time, initial cracking time and critical time from crack expansion to jointed rock mass of the test piece, selects different times for sample removal, cleaning, weighing and adopts electron microscope scanning and X-ray fluorescence spectrum analysis to establish corrosion different corrosivity and chloride ion concentration and corrosion time calibration relation research.
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