CN109855962B - Underground concrete stray current and cyclic impact load test system and test method - Google Patents
Underground concrete stray current and cyclic impact load test system and test method Download PDFInfo
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- 239000004567 concrete Substances 0.000 title claims abstract description 102
- 238000012360 testing method Methods 0.000 title claims abstract description 41
- 125000004122 cyclic group Chemical group 0.000 title claims abstract description 27
- 238000010998 test method Methods 0.000 title description 3
- 238000002474 experimental method Methods 0.000 claims abstract description 30
- 239000002689 soil Substances 0.000 claims abstract description 23
- 238000004080 punching Methods 0.000 claims abstract description 22
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 21
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical class [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 claims abstract description 21
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 21
- 239000010439 graphite Substances 0.000 claims abstract description 21
- 230000003068 static effect Effects 0.000 claims abstract description 7
- 238000001514 detection method Methods 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 17
- 239000010959 steel Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000008569 process Effects 0.000 claims description 4
- 238000006056 electrooxidation reaction Methods 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 2
- 230000035515 penetration Effects 0.000 claims description 2
- 230000009471 action Effects 0.000 abstract description 5
- 239000011150 reinforced concrete Substances 0.000 abstract description 5
- 238000004451 qualitative analysis Methods 0.000 abstract description 3
- 238000004445 quantitative analysis Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The invention relates to an underground concrete stray current and cyclic impact load test system which comprises a bearing frame, an experiment groove, a punching machine, a jack, a bearing plate, a constant potential rectifier, a volt-ampere meter, a graphite electrode plate, a saturated copper sulfate reference electrode, a wiring terminal, a lining plate and a control circuit, wherein the experiment groove is embedded in the bearing frame, the punching machine is arranged on the upper end face of the bearing frame and is connected with the bearing plate, the bearing plate is positioned in the bearing frame and is positioned right above the experiment groove, the jack is positioned on the outer side face of the bearing frame, the front end face is connected with the rear end face of the lining plate, the lining plate is embedded in the experiment groove, the constant potential rectifier and the volt-ampere meter are both positioned on the outer side face of the bearing frame, the constant potential rectifier is respectively connected with the graphite electrode plate and the saturated copper sulfate reference electrode, and the volt-ampere meter is electrically connected with the wiring terminal. The invention is convenient for qualitative and quantitative analysis of reinforced concrete; and a lateral static load is applied to the concrete test block to simulate the action of the soil pressure suffered by the underground concrete structure, so that the concrete test block is more in line with the actual stress condition.
Description
Technical Field
The invention relates to an underground concrete stray current and cyclic impact load test system and an experimental method, and belongs to the technical field of constructional engineering.
Background
Along with the continuous promotion of the urban process, more and more cities start building underground rail transit to relieve ground traffic pressure, so that people can travel conveniently. In the operation process of the subway, the rail and ground insulation performance of the subway tunnel is reduced due to the influence of unavoidable pollution, moisture, water seepage, high ground stress and the like, so that stray current is formed in the concrete structure and soil at the bottom of the ballast bed. The presence of stray currents can greatly increase the rust rate of the steel bars in the concrete. In addition, the concrete structure at the lower part of the ballast bed is continuously subjected to vertical impact load in the running process of the subway train, and is in a stress fatigue state for a long time. Therefore, research on damage mechanism and durability state evaluation of an underground concrete structure under the action of stray current and cyclic impact load is a hot spot field of research in recent years.
The existing test device for researching the durability of the underground concrete structure focuses on the influence research of a certain factor. Because of the complexity of the environment in which the underground engineering is located, the influence study under the combined action of multiple factors is also qualitative study, and the quantitative study of the combined influence of the factors is less common. Therefore, there is an urgent need to develop a test system for underground concrete under the effect of multi-factor coupling.
Disclosure of Invention
In order to solve the defects in the prior art, the invention provides an underground concrete stray current and cyclic impact load test system and an experimental method.
In order to achieve the above-mentioned effect, a test system and a test method for stray current and cyclic impact load of underground concrete are provided, wherein the test system comprises the following steps:
the underground concrete stray current and cyclic impact load test system comprises a bearing frame, an experiment tank, a punching machine, a jack, a bearing plate, a constant potential rectifier, a voltammeter, a graphite electrode plate, a saturated copper sulfate reference electrode, a wiring terminal, a lining plate and a control circuit, wherein the bearing frame is of a frame structure with a rectangular cross section, the axis of the frame structure is vertically distributed with a horizontal plane, the experiment tank is of a U-shaped groove-shaped structure with a cross section, the experiment tank is embedded in the bearing frame and is coaxially distributed with the bearing frame, the punching machine is arranged on the upper end surface of the bearing frame and is coaxially distributed with the bearing frame, the punching head of the punching machine is mutually connected with the bearing plate and is coaxially distributed, the bearing plate is positioned in the bearing frame and right above the experiment tank, the jack is positioned on the outer side surface of the bearing frame, the axis of the jack is vertically intersected with the axis of the experiment tank, and the intersection point is positioned at the center of the experiment tank, the side surface of the experimental tank corresponding to the jack is provided with through holes, the front end surface of the jack is positioned in the experimental tank through the through holes and is connected with the rear end surface of the lining board and is coaxially distributed with the lining board, the lining board is embedded in the experimental tank and is parallel to the axis of the experimental tank and is respectively in sliding connection with the side wall and the bottom of the experimental tank, the potentiostat and the voltammeter are both positioned on the outer side surface of the bearing frame, wherein the potentiostat is respectively connected with the graphite electrode plate and the saturated copper sulfate reference electrode, the voltammeter is electrically connected with the wiring terminals, at least one of the graphite electrode plate and the saturated copper sulfate reference electrode is formed by one graphite electrode plate and one saturated copper sulfate reference electrode, at least two wiring terminals are formed by two wiring terminals, the saturated copper sulfate reference electrode in the same working group is positioned between the graphite electrode plate and the concrete test block, the control circuit is positioned on the side surface of the bearing frame, and are respectively and electrically connected with the punching machine, the jack, the constant potential rectifier and the voltammeter.
Furthermore, the bottom of the experiment groove is connected with the bottom of the bearing frame in a sliding manner through a guide sliding rail, and the height of the experiment groove is 50% -80% of the height of the bearing frame.
Further, the bearing plate comprises two bearing plates, bearing springs and a scale, wherein the two bearing plates are mutually parallel and connected through the bearing springs, the bearing springs are uniformly distributed around the axis of the bearing plate, the two scale are symmetrically distributed at the middle points of the bearing plates and are connected with the side surfaces of the bearing plates positioned below, and the scale is respectively and vertically distributed with the two bearing plate surfaces.
Furthermore, pressure sensors are arranged at two ends of the pressure-bearing spring, and each pressure sensor is electrically connected with the control circuit.
Furthermore, at least one pressure sensor is arranged among the punching machine, the bearing plate, the jack and the lining plate, and the pressure sensor is electrically connected with the control circuit.
Further, a plurality of convex blocks are uniformly distributed on the lower end surface of the bearing plate and the front end surface of the lining plate.
Further preferably, the cross section of the bump is any one of isosceles trapezoid, isosceles triangle, rectangle and circular arc structure.
Further, the control circuit is a circuit system based on a single chip microcomputer.
The experimental method of the underground concrete stray current and cyclic impact load test system comprises the following steps:
the method comprises the steps of S1, prefabricating a concrete block to be detected according to the volume of an experimental tank, enabling the volume of the concrete block to be detected to be 30% -80% of the volume of the experimental tank, then placing the concrete block to be detected into the experimental tank and coaxially distributing the concrete block and the experimental tank, electrically connecting a wiring terminal of the same detection group with two ends of the same reinforcing steel bar in the concrete block to be detected, detecting an initial resistance value, positioning a graphite electrode plate and a saturated copper sulfate reference electrode at a position between the concrete block to be detected and the side wall of the experimental tank, taking soil at the peripheral position of the concrete block to be detected in the natural environment when the concrete block to be detected is actually used, filling the soil into the experimental tank and wrapping the soil outside the concrete block to be detected, compacting and adjusting the water content of the soil, enabling the pressure and the water penetration environment of the concrete block to be consistent with the soil environment in the natural environment when the soil to be detected is actually used, and finally installing the experiment tank for loading and positioning the concrete block to be detected into a bearing frame and coaxially distributing the concrete block to be detected;
s2, experimental detection, namely after the operation of the step S1 is completed, on one hand, a jack drives a lining plate to apply horizontal constant pressure to the concrete block to be detected, on the other hand, a punching machine drives a bearing plate to perform up-and-down reciprocating motion, the bearing plate applies vertical alternating pressure to the concrete block to be detected in an experimental tank, meanwhile, an anode of a potentiostat is connected with steel bars in the concrete block, a cathode is connected with a graphite electrode plate, stray current is applied to soil coated with the concrete block to be detected, and a reference electrode potential is connected with a saturated copper sulfate reference electrode to keep constant of output stray current. Finally, after the potentiostat is closed, the current value of the steel bar is detected through an ammeter, so that the concrete block to be detected is detected in a load environment with the coexistence of a stray current environment and a cyclic impact load, and the detection result is summarized into a control circuit;
s3, data processing, namely, according to the detection data result obtained in the step S2, a control circuit obtains the cyclic impact load and horizontal static load of the concrete block to be detected by detecting the pressure value through a pressure sensor on the one hand; on the other hand, according to the resistance calculation formula:if the measured resistance increases compared to that before the S1 arrangement begins, the reinforcement begins to develop electrochemical corrosion.
In the step S2, a stray current is applied to the concrete block to be detected by a potentiostat, and then an ammeter is performed to detect the current value of the steel bar, so that a detection flow is formed, and the concrete block to be detected in the step S2 needs to be continuously detected for a plurality of times until the concrete test block is burst. The time interval between the operation of the potentiostat and the detection of the ammeter in the same detection flow is equal, and the time interval takes 1 hour as a basic unit.
Further, the resistance calculation formula:in,
r is a resistor;
is resistivity;
to detect the length of the steel bar;
to detect the cross-sectional area of the rebar.
The impact load and the stray current can be independently acted, can be acted together, and are not influenced by each other, and the impact load and the stray current of each test can be controlled when the impact load and the stray current are acted together, so that the qualitative and quantitative analysis of the reinforced concrete can be conveniently carried out; applying lateral static load to the concrete test block to simulate the action of soil pressure applied to the underground concrete structure, so that the concrete test block is more in line with the actual stress situation; the parallel circuit is added to the anode of the potentiostat, so that the simultaneous test of multiple steel bars in the concrete test block can be realized, and the potentiostat has strong remodelling performance. Therefore, the technical scheme of the invention can be widely used for researching the durability of the reinforced concrete structure of the underground engineering.
Drawings
The invention is described in detail below with reference to the drawings and the detailed description;
FIG. 1 is a schematic view of the structure of the present invention
FIG. 2 is a flow chart of the method of the present invention.
Detailed Description
In order to facilitate the construction of the technical means, the creation characteristics, the achievement of the purposes and the effects of the invention, the invention is further described below with reference to the specific embodiments.
The system for testing the stray current and the cyclic impact load of the underground concrete, as shown in fig. 1, comprises a bearing frame 1, an experiment groove 2, a punching machine 3, a jack 4, a bearing plate 5, a constant potential rectifier 6, a voltammeter 7, a graphite electrode plate 8, a saturated copper sulfate reference electrode 9, a wiring terminal 10, a lining plate 11 and a control circuit 12, wherein the bearing frame 1 is a frame structure with a rectangular cross section, the axis of the frame structure is vertically distributed with the horizontal plane, the experiment groove 2 is a groove-shaped structure with a U-shaped cross section, the experiment groove 2 is embedded in the bearing frame 1 and coaxially distributed with the bearing frame 1, the punching machine 3 is arranged on the upper end surface of the bearing frame 1 and coaxially distributed with the bearing frame 1, a punch head of the punching machine 3 is mutually connected with the bearing plate 5 and coaxially distributed, the bearing plate 5 is positioned in the bearing frame 1 and right above the experiment groove 2, the jack 3 is positioned on the outer side surface of the bearing frame 1, the axis of the jack 4 is perpendicular to the axis of the experimental tank 2 and intersects, the intersection point is positioned at the center of the experimental tank 2, through holes 13 are arranged on the side surface of the experimental tank 2 corresponding to the jack 4, the front end surface of the jack 4 is positioned in the experimental tank 2 through the through holes 13 and is connected with the rear end surface of a lining plate 11 and is coaxially distributed with the lining plate 11, the lining plate 11 is embedded in the experimental tank 2 and is parallel to the axis of the experimental tank 2 and is respectively in sliding connection with the side wall and the bottom of the experimental tank 2, a potentiostat 6 and a voltammeter 7 are both positioned on the outer side surface of the bearing frame 1, wherein the potentiostat 6 is respectively connected with a graphite electrode plate 8 and a saturated copper sulfate reference electrode 9, the voltammeter 7 is electrically connected with a wiring terminal 10, at least one of the graphite electrode plate 8 and the saturated copper sulfate reference electrode 9 forms a working group, at least two of the wiring terminal 10, and two binding posts 10 form a detection group, the interval between the graphite electrode plate 8 and the saturated copper sulfate reference electrode 9 in the same working group is not more than 1/2 of the width of the experimental tank 2, and a control circuit 12 is positioned on the side surface of the bearing frame 1 and is electrically connected with the punching machine 3, the jack 4, the potentiostat 6 and the voltammeter 7 respectively.
In this embodiment, the bottom of the experimental tank 2 and the bottom of the bearing frame 1 are slidably connected with each other through the guide slide rail 14, and the height of the experimental tank 2 is 50% -80% of the height of the bearing frame 1.
The bearing plates 5 comprise two bearing plates 51, bearing springs 52 and scales 53, wherein the two bearing plates 51 are distributed in parallel and are connected with each other through the bearing springs 52, the plurality of bearing springs 52 are uniformly distributed around the axis of the bearing plates 51, the two scales 53 are symmetrically distributed at the middle points of the bearing plates 51 and are connected with the side surfaces of the bearing plates 51 positioned below, the scales 53 are respectively distributed perpendicular to the surfaces of the two bearing plates 51, pressure sensors 15 are respectively arranged at two ends of each bearing spring 52, and each pressure sensor 15 is electrically connected with the control circuit 12.
In addition, at least one pressure sensor 15 is arranged between the punching machine 3 and the bearing plate 5, between the jack 4 and the lining plate 11, and the pressure sensor 15 is electrically connected with the control circuit 12.
Meanwhile, a plurality of convex blocks 16 are uniformly distributed on the lower end face of the bearing plate 5 and the front end face of the lining plate 11, and the cross section of each convex block 16 is any one of isosceles trapezoid, isosceles triangle, rectangle and circular arc structure.
In this embodiment, the control circuit 12 is a circuit system based on a single chip microcomputer.
As shown in fig. 2, the experimental method of the underground concrete stray current and cyclic impact load test system comprises the following steps:
the method comprises the steps of S1, prefabricating a concrete block to be detected, firstly preparing the concrete block to be detected according to the volume of an experimental tank, enabling the volume of the concrete block to be detected to be 30% -80% of the volume of the experimental tank, then placing the concrete block to be detected into the experimental tank and coaxially distributing the concrete block to be detected and the experimental tank, electrically connecting a wiring terminal of the same detection group with two end positions of the same steel bar 17 in the concrete block to be detected, detecting an initial resistance value, positioning a graphite electrode plate and a saturated copper sulfate reference electrode at the position between the concrete block to be detected and the side wall of the experimental tank, taking soil 18 at the peripheral position of the natural environment when the concrete block to be detected is actually used, filling the soil 18 into the experimental tank and wrapping the soil 18 outside the concrete block to be detected, and then compacting and adjusting the water content of the soil 18, so that the pressure and the water content of the concrete block to be detected and the soil environment in the natural environment to be detected are kept consistent, and finally loading and positioning the concrete block to be detected can be completed, and finally loading and positioning the concrete block to be detected to be coaxially arranged in a bearing frame;
s2, experimental detection, namely after the operation of the step S1 is completed, on one hand, a jack drives a lining plate to apply horizontal constant pressure to the concrete block to be detected, on the other hand, a punching machine drives a bearing plate to perform up-and-down reciprocating motion, the bearing plate applies vertical alternating pressure to the concrete block to be detected in an experimental tank, meanwhile, an anode of a potentiostat is connected with steel bars in the concrete block, a cathode is connected with a graphite electrode plate, stray current is applied to soil coated with the concrete block to be detected, and a reference electrode potential is connected with a saturated copper sulfate reference electrode to keep constant of output stray current. Finally, after the potentiostat is closed, the current value of the steel bar is detected through an ammeter, so that the concrete block to be detected is detected in a load environment with the coexistence of a stray current environment and a cyclic impact load, and the detection result is summarized into a control circuit;
s3, data processing, namely obtaining the cyclic impact load and the horizontal static load of the concrete block to be detected by the pressure sensor according to the detection data obtained in the step S2, and obtaining the cyclic impact load and the horizontal static load of the concrete block to be detected by the control circuit according to a resistance calculation formula:if the measured resistance increases compared to that before the S1 arrangement starts, the reinforcement 17 starts to develop electrochemical corrosion.
In the step S2, the stray current is applied to the concrete block to be detected by the potentiostat once, and then the current value of the steel bar is detected by the ammeter once, so that a detection flow is formed, and the concrete block to be detected in the step S2 needs to be continuously detected for a plurality of times until the concrete test block is burst. The time interval between the operation of the potentiostat and the detection of the ammeter in the same detection flow is equal, and the time interval takes 1 hour as a basic unit.
S3, in the step of: resistance calculation formula:in (a) and (b);
r is a resistor;
is resistivity;
to detect the length of the steel bar;
to detect the cross-sectional area of the rebar.
The impact load and the stray current can be independently acted, can be acted together, and are not influenced by each other, and the impact load and the stray current of each test can be controlled when the impact load and the stray current are acted together, so that the qualitative and quantitative analysis of the reinforced concrete can be conveniently carried out; applying lateral static load to the concrete test block to simulate the action of soil pressure applied to the underground concrete structure, so that the concrete test block is more in line with the actual stress situation; the parallel circuit is added to the anode of the potentiostat, so that the simultaneous test of multiple steel bars in the concrete test block can be realized, and the potentiostat has strong remodelling performance. Therefore, the technical scheme of the invention can be widely used for researching the durability of the reinforced concrete structure of the underground engineering.
The foregoing has shown and described the basic principles and main features of the present invention and the advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. Underground concrete stray current and cyclic impact load test system, its characterized in that: the underground concrete stray current and cyclic impact load test system comprises a bearing frame, an experiment groove, a punching machine, a jack, a bearing plate, a constant potential rectifier, a volt-ampere meter, a graphite electrode plate, a saturated copper sulfate reference electrode, a wiring terminal, a lining plate and a control circuit, wherein the bearing frame is of a frame structure with a rectangular cross section, the axis of the frame structure is vertically distributed with the horizontal plane, the experiment groove is of a groove-shaped structure with a U-shaped cross section, the experiment groove is embedded in the bearing frame and is coaxially distributed with the bearing frame, the punching machine is arranged on the upper end surface of the bearing frame and is coaxially distributed with the bearing frame, the punching head of the punching machine is mutually connected with the bearing plate and is coaxially distributed, the bearing plate is positioned in the bearing frame and is positioned right above the experiment groove, the jack is positioned on the outer side surface of the bearing frame, the axis of the jack is vertical to and intersects with the axis of the experiment groove, the intersection point is positioned at the center of the experimental tank, the corresponding side surface of the experimental tank is provided with a through hole, the front end surface of the jack is positioned in the experimental tank through the through hole and is connected with the rear end surface of the lining plate and is coaxially distributed with the lining plate, the lining plate is embedded in the experimental tank and is parallel to the axis of the experimental tank and is respectively and slidably connected with the side wall and the bottom of the experimental tank, the potentiostat and the voltammeter are both positioned on the outer side surface of the bearing frame, wherein the potentiostat is respectively and mutually connected with a graphite electrode plate and a saturated copper sulfate reference electrode, the voltammeter is electrically connected with wiring terminals, at least one of the graphite electrode plate and the saturated copper sulfate reference electrode forms a working group, at least two wiring terminals and two wiring terminals form a detection group, the saturated copper sulfate reference electrode in the same working group is positioned between the graphite electrode plate and the concrete test block, and the control circuit is positioned on the side surface of the bearing frame and is electrically connected with the punching machine, the jack, the potentiostat and the voltammeter respectively;
the bearing plates comprise two bearing plates, bearing springs and scales, wherein the two bearing plates are mutually parallel and connected through the bearing springs, a plurality of bearing springs are uniformly distributed around the axis of the bearing plates, the two scales are symmetrically distributed at the middle points of the bearing plates and connected with the side surfaces of the bearing plates positioned below, and the scales are respectively and vertically distributed with the plate surfaces of the two bearing plates;
pressure sensors are arranged at two ends of the pressure-bearing spring, and each pressure sensor is electrically connected with the control circuit;
at least one pressure sensor is arranged between the punching machine and the bearing plate, between the jack and the lining plate, and the pressure sensor is electrically connected with the control circuit.
2. The system for testing the stray current and the cyclic impact load of the underground concrete according to claim 1, wherein the bottom of the experiment tank and the bottom of the bearing frame are connected in a sliding manner through guide sliding rails, and the height of the experiment tank is 50% -80% of the height of the bearing frame.
3. The system for testing the stray current and the cyclic impact load of the underground concrete according to claim 1, wherein a plurality of bumps are uniformly distributed on the lower end surface of the bearing plate and the front end surface of the lining plate.
4. The underground concrete stray current and cyclic impact load test system according to claim 1, wherein the control circuit is a singlechip-based circuit system.
5. The underground concrete stray current and cyclic impact load test system according to claim 1, wherein: the experimental method of the underground concrete stray current and cyclic impact load test system comprises the following steps:
the method comprises the steps of S1, prefabricating a concrete block to be detected according to the volume of an experimental tank, enabling the volume of the concrete block to be detected to be 30% -80% of the volume of the experimental tank, then placing the concrete block to be detected into the experimental tank and coaxially distributing the concrete block and the experimental tank, electrically connecting a wiring terminal of the same detection group with two ends of the same reinforcing steel bar in the concrete block to be detected, detecting an initial resistance value, positioning a graphite electrode plate and a saturated copper sulfate reference electrode at a position between the concrete block to be detected and the side wall of the experimental tank, taking soil at the peripheral position of the concrete block to be detected in the natural environment when the concrete block to be detected is actually used, filling the soil into the experimental tank and wrapping the soil outside the concrete block to be detected, compacting and adjusting the water content of the soil, enabling the pressure and the water penetration environment of the concrete block to be detected to be consistent with those of the natural environment when the soil to be detected is actually used, and finally installing the concrete block to be detected into a bearing frame and coaxially distributing the concrete block to be detected;
s2, experimental detection, namely after finishing the operation of the step S1, on one hand, driving a lining plate to apply horizontal constant pressure to the concrete block to be detected through a jack, on the other hand, driving a bearing plate to perform up-and-down reciprocating motion through a punching machine, applying alternating pressure in the vertical direction to the concrete block to be detected in an experimental tank through the bearing plate, simultaneously, connecting an anode of a potentiostat with steel bars in the concrete block, connecting a cathode with a graphite electrode plate, applying stray current to soil coated with the concrete block to be detected, and connecting a reference electrode potential with a saturated copper sulfate reference electrode to keep constant output stray current; finally, after the potentiostat is closed, the current value of the steel bar is detected through an ammeter, so that the concrete block to be detected is detected in a load environment with the coexistence of a stray current environment and a cyclic impact load, and the detection result is summarized into a control circuit;
s3, data processing, namely, according to the detection data result obtained in the step S2, a control circuit obtains the cyclic impact load and horizontal static load of the concrete block to be detected by detecting the pressure value through a pressure sensor on the one hand; on the other hand, according to the resistance calculation formula:if measuredThe resistance increases compared with the resistance before the arrangement of the S1 is started, so that the steel bars begin to generate electrochemical corrosion.
6. The experimental method of the system for testing the stray current and the cyclic impact load of the underground concrete according to claim 5, wherein in the step S2, the stray current is applied to the concrete block to be tested once by a potentiostat, and then the current value of the steel bar is tested once by an ammeter, so that a testing process is formed, and in the step S2, the concrete block to be tested needs to be continuously tested for a plurality of times until the concrete test block is burst; the time interval between the operation of the potentiostat and the detection of the ammeter in the same detection flow is equal, and the time interval takes 1 hour as a basic unit.
7. The method for testing the system for testing the stray current and the cyclic impact load of the underground concrete according to claim 5, wherein in the step S3, the resistance calculation formula is as follows:in,
r is a resistor;
is resistivity;
to detect the length of the steel bar;
to detect the cross-sectional area of the rebar.
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| CN110823705A (en) * | 2019-10-31 | 2020-02-21 | 河南理工大学 | Indoor pressurization test device and method for bidirectional pressurization large-size concrete test block |
| CN110726629A (en) * | 2019-10-31 | 2020-01-24 | 河南理工大学 | Indoor test system and method for gas impact concrete test block |
| CN111254995B (en) * | 2020-02-21 | 2021-10-26 | 中国矿业大学 | Pile foundation nondestructive real-time detection system and method based on potential signals |
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