CN109238844B - Tunnel lining structure crack treatment experimental method - Google Patents
Tunnel lining structure crack treatment experimental method Download PDFInfo
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- CN109238844B CN109238844B CN201810908356.3A CN201810908356A CN109238844B CN 109238844 B CN109238844 B CN 109238844B CN 201810908356 A CN201810908356 A CN 201810908356A CN 109238844 B CN109238844 B CN 109238844B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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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
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0017—Tensile
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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
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
- G01N2203/0066—Propagation of crack
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Abstract
The invention belongs to the technical field of tunnel engineering, and particularly relates to an experimental method for treating cracks of a tunnel lining structure. The method is implemented specifically by adopting a tunnel lining structure crack treatment experiment simulation platform which comprises an experiment table, wherein a fixed hinged support is arranged on the upper surface of the experiment table, an arched lining model steel frame is arranged at the upper end of the fixed hinged support, a worm gear loading device is arranged between two ends of the arched lining model steel frame and the experiment table, and a tension tester and a displacement meter are arranged on the worm gear loading device. The invention adopts the arc-shaped workpiece to simulate the stress characteristics of the tunnel lining, changes the direction and the moment of the pulling force, changes the transverse tension into the tension of the arc-shaped lining, better conforms to the stress characteristics of the tunnel structure and ensures the accuracy of platform loading.
Description
The application is a divisional application of a patent application with the application number of 201610537559.7, which is filed on 2016, 7, 8 and is named as a tunnel lining structure crack treatment experiment simulation platform and an experiment method.
Technical Field
The invention belongs to the technical field of tunnel engineering, and particularly relates to an experimental method for treating cracks of a tunnel lining structure.
Technical Field
In the existing simulation method of the tunnel lining structure, most of indoor experiments are adopted to simulate the treatment effect influenced by single factor, for example, a tunnel lining structure crack treatment experiment is simulated in a water leakage state, or a tunnel lining structure crack treatment experiment is simulated under the condition of continuous stress cracking, the bonding degree and the material strength of a repairing material are tested, then the experiment results are comprehensively compared, and the optimal mixing ratio of the repairing material is found out through the method. The simulation method neglects the condition that actual multiple factors influence the treatment of the tunnel lining structure crack, so that the result obtained by the test is inaccurate, usually, in practice, the tunnel lining structure crack has double factors of water leakage and continuous stress cracking, and meanwhile, the repair materials in the existing market are epoxy resin and carbon fiber cloth. Polymer cement slurries, and the like. However, these repair materials are expensive and not suitable for mass popularization.
Disclosure of Invention
The invention aims to provide an experimental method for treating cracks of a tunnel lining structure, aiming at the technical problems that in the prior art, the actual multi-factor influence on the repairing effect is neglected in a tunnel lining structure crack treatment simulation experiment and the cost of the repairing material in the existing market is high and is not suitable for popularization.
In order to achieve the purpose, the invention mainly adopts the following technical scheme to solve the problem:
a treatment experiment method for a tunnel lining structure crack comprises the following steps:
step 1: sequentially selecting test pieces with various crack specifications; mounting a test piece on a test bed;
step 2: preparing a repairing material;
and step 3: the method is used for simulating a treatment experiment of a lining crack under different water seepage conditions, and comprises the following specific steps: adjusting the water seepage amount, injecting the repairing material into the crack under each water seepage amount condition, loading tension after the repairing material is initially set, and respectively recording the initial setting time, crack displacement and loading force readings of the repairing material under different water seepage states;
and 4, step 4: the method is used for simulating a treatment experiment under the condition that the lining crack is continuously stressed and cracked, and comprises the following specific steps: after the step 1 and the step 2 are implemented, injecting a repairing material into the crack, continuously loading a tensile force after the initial setting is finished, and recording initial setting time, the loaded tensile force and crack displacement in real time after the test piece cracks;
and 5: the method is used for simulating a treatment experiment of the lining crack under the action of double factors of water leakage and continuous stress cracking, and comprises the following specific steps: and (3) repeating the step (1) and the step (2), respectively testing under the condition of the three water seepage amounts in the step (3), injecting the repair slurry into the crack, continuously loading the tensile force after the repair slurry is initially set, so that the test piece is cracked, and recording initial setting time, the loaded tensile force and crack displacement in real time.
Step 6: analyzing the repairing effect according to the measured experimental data, adjusting the mixing proportion of the repairing material, repeating the steps 1, 3, 4 and 5, and recording the experimental data to obtain the optimal mixing proportion of the repairing material.
Further, the repairing material in the step 2 is polymer-based gel, which is prepared from the following materials in parts by weight: 10-16 parts of fly ash, metakaolin, a composite excitant, portland cement and silica fume: 60-70: 8-13: 8-13: 1 to 2.
Further, the composite excitant slurry is prepared from the following materials in parts by weight: 75-85% of instant sodium silicate, namely sodium hydroxide and nano silicon dioxide: 5-15: 5 to 15.
The concrete implementation of the tunnel lining structure crack treatment experiment method adopts the following tunnel lining structure crack treatment experiment simulation platform which comprises a test bed, a displacement meter, two independent arc-shaped steel grooves and a hinged support arranged on the test bed, wherein the cross section of each arc-shaped steel groove is rectangular; the lower surfaces of one ends of the two arc-shaped steel grooves are connected with the hinged support, and the two arc-shaped steel grooves jointly form an arc-shaped workpiece; the other ends of the two arc-shaped steel grooves are connected with the test bed through supporting rods, and the supporting rods are hinged with the arc-shaped steel grooves; force loading devices are arranged below the other ends of the two arc-shaped steel grooves, and a tension dynamometer is arranged between the arc-shaped steel frame and the corresponding force loading device; one ends of the two arc-shaped steel grooves, which are close to the hinged support, are provided with test piece fixing devices; the displacement meter is mounted on the test piece.
One end of each of the two arc-shaped steel grooves, which is close to the corresponding force loading device, is connected with a spring, and the tension direction of the springs is opposite to the direction of the loading force of the force loading devices; in the non-working state, the spring is in a natural state.
The test piece dismounting device comprises a T-shaped frame formed by connecting two rectangular plates, a pedal plate and two cylindrical support rods; the pedal plate horizontally penetrates through a vertical rectangular plate in the T-shaped frame and is hinged with the rectangular plate, one end of each of two cylindrical support rods is hinged with the pedal plate, the other end of each of the two cylindrical support rods vertically penetrates through the rectangular plate in the horizontal direction in the T-shaped frame, and the upper end of each of the two cylindrical support rods sequentially penetrates through a through hole formed in the bottom surface of the experiment table and an arc-shaped steel groove; the horizontal rectangular plate in the T-shaped frame is connected with the experiment table.
The hinged support comprises a rotating shaft, a support frame and two branch supports, the rotating shaft is fixed on the test bed through the support frame, the two branch supports are all installed on the rotating shaft, the branch supports can rotate relative to the rotating shaft, and each branch support is fixedly connected with the lower surface of one end of the corresponding arc-shaped steel groove.
The fixing device is characterized in that a threaded hole is formed in the side face of the arc-shaped steel groove, and the test piece is fixed in the arc-shaped steel groove through a fixing bolt.
Before the treatment test method provided by the invention, the following diagnosis test method for the cracks of the tunnel lining structure, which is provided by the invention, can be adopted, and the method comprises the following steps:
step 1: preparing test pieces with different specifications of cracks;
step 2: mounting a test piece, continuously loading, simulating the stress and continuous cracking of a crack test piece, and recording the cracking degree, the displacement of the crack and the magnitude of loading force under different stress conditions in real time;
and step 3: replacing crack test pieces with different specifications, and implementing the step 1 and the step 2;
and 4, step 4: and summarizing the relationship among the crack cracking time, the size of the crack and the loading force of the crack test piece with different specifications under the condition of different loading forces in the continuous stress process according to the data obtained in the steps 1, 2 and 3.
In step 1, the fracture sizes of the test pieces with different fracture specifications are respectively 0.5 mm, 1mm, 2 mm, 5 mm, 10 mm and 20 mm.
Compared with the prior art, the invention has the following technical characteristics:
according to the invention, the force loading device provides cracking tension for the test piece, and the force loading device is meshed with the transmission shaft and continuously transmits, so that the cracking size of the crack can be accurately controlled, and the test precision requirement is met. The tension meter is connected between the force loading device and the arc-shaped rigid groove, so that the tension provided by the force loading device and the displacement of the test piece crack can be accurately measured, the tension born by the test piece crack can be calculated through mechanical calculation, and the reliability of data is ensured. The concrete test piece is placed in the hollow groove of arc steel channel, and is fixed with the fixing device in the arch lining model steelframe outside, and it is convenient to change during the experiment. The arc-shaped workpiece is adopted to simulate the stress characteristics of the tunnel lining, the direction and the moment of the pulling force are changed, the transverse tension is changed into the tension of the arc-shaped lining, the stress characteristics of the tunnel structure are better met, and the loading accuracy of the platform is ensured.
Drawings
FIG. 1 is a schematic view of a simulation apparatus for treating cracks in a tunnel lining structure;
FIG. 2 is a schematic view of a hinged support in a tunnel lining structure crack treatment simulation platform;
FIG. 3 is a schematic view of a dismounting device in a simulation platform for treating a crack of a tunnel lining structure;
FIG. 4 is a three-dimensional schematic view of a simulation platform for treating a crack of a tunnel lining structure;
the meaning of the reference symbols in the figures is: 1-a spring; 2-arc steel groove; 3-a tension dynamometer; 4-a force loading device; 5-a test piece fixing device; 6-test piece; 7-hinged support; 8-test bed; 9-disassembling the device; 10-a support frame; 11-branch support; 12-a rotating shaft; 13-horizontal rectangular plate; 14-a foot pedal; 15-a cylindrical support frame; 16-vertical rectangular plate.
Detailed Description
Example 1
The embodiment provides a tunnel lining structure crack treatment experiment simulation platform which comprises a test bed, a displacement meter, two independent arc-shaped steel grooves 2 and a hinged support 7 installed on the test bed, wherein the cross section of each arc-shaped steel groove 2 is rectangular; the lower surfaces of one ends of the two arc-shaped steel grooves 2 are connected with a hinged support 7, and the two arc-shaped steel grooves 2 jointly form an arc-shaped workpiece; the other ends of the two arc-shaped steel grooves are connected with the test bed through supporting rods, and the supporting rods are hinged with the arc-shaped steel grooves; force loading devices 4 are arranged below the other ends of the two arc-shaped steel grooves, and a tension dynamometer 3 is arranged between the arc-shaped steel frame and the corresponding force loading device 4; one ends of the two arc-shaped steel grooves close to the hinged support 7 are provided with test piece fixing devices 5; the displacement meter is mounted on the test piece.
Above technical scheme provides a tunnel lining structure crack treatment experiment simulation platform that is close to reality, provides fracture tension for the test piece through power loading device, and power loading device and transmission shaft interlock each other and continuous drive can accurate control cracked size, satisfy experimental required precision. The tension meter is connected between the force loading device and the arc-shaped rigid groove, so that the tension provided by the force loading device and the displacement of the test piece crack can be accurately measured, the tension born by the test piece crack can be calculated through mechanical calculation, and the reliability of data is ensured. The concrete test piece is placed in the hollow groove of arc steel channel, and is fixed with the fixing device in the arch lining model steelframe outside, and it is convenient to change during the experiment. The arc-shaped workpiece is adopted to simulate the stress characteristics of the tunnel lining, the direction and the moment of the pulling force are changed, the transverse tension is changed into the tension of the arc-shaped lining, the stress characteristics of the tunnel structure are better met, and the loading accuracy of the platform is ensured.
One end of the arc-shaped steel groove 2, which is close to the corresponding force loading device 4, is connected with a spring 1, and the tension direction of the spring 1 is opposite to the direction of the loading force of the force loading device 4; in the non-operating state, the spring 1 is in a natural state.
The test bed is connected with the arc-shaped steel groove through the spring, so that the test piece is prevented from being suddenly damaged in a brittle manner in the process of applying force by the force loading device, and the safety of the test is ensured.
Preferably, the test piece dismounting device 9 on the test bed, the test piece dismounting device 9 comprises a T-shaped frame formed by connecting two rectangular plates, a pedal plate 14 and two cylindrical support frames 15; the pedal 14 passes through a vertical rectangular plate 16 in the T-shaped frame and is hinged with the rectangular plate, one end of each of the two cylindrical support frames is hinged with the pedal, the other end of each of the two cylindrical support frames vertically passes through a horizontal rectangular plate 13 in the T-shaped frame, and the rectangular plate 13 in the horizontal direction of the T-shaped frame is connected with the lower surface of the experiment table 8.
Test platform increases foot-operated dismounting device, when trading the concrete sample from arch lining cutting model steelframe, steps on pedal dismounting device with the foot, and through lever principle, cylindrical support frame makes the test piece by jack-up, and is more laborsaving when trading the test piece.
Wherein, hinged-support includes pivot 12, support frame 10 and two branch supports 11, and pivot 12 passes through support frame 10 to be fixed on the test bench, and two branch supports 11 are all installed on pivot 12 and branch's seat 11 can rotate for pivot 12, and every branch support 11 links firmly with the lower surface of 2 one ends of the arc steel bay that correspond.
The hinge support is provided with a rotating shaft, the branch support arranged on the rotating shaft supports the arc-shaped steel groove, and the branch support can rotate relative to the rotating shaft, so that the arc-shaped steel groove can be opened and closed under the action of the force loading device.
The fixing device is characterized in that a threaded hole 5 is formed in the side face of the arc-shaped steel groove 2, and the test piece 6 and the arc-shaped steel groove 2 are fixed through a fixing bolt.
The concrete test piece is fixed by the bolt, so that the fixing is stable and the disassembly is convenient.
Preferably, the force loading device 4 is a worm wheel loading device. The worm gear loading device is stable and accurate when loading tension, and can ensure the accuracy of the test.
Example 2
The embodiment provides a diagnostic experiment method for a tunnel lining structure crack, which comprises the following steps:
step 1: preparing test pieces with cracks of different specifications, wherein the specific specifications are as follows: the sizes of the cracks are respectively 0.5 mm, 1mm, 2 mm, 5 mm, 10 mm and 20 mm;
step 2: mounting a test piece, continuously loading, simulating the stress and continuous cracking of a crack test piece, and recording the cracking degree, the displacement of the crack and the magnitude of loading force under different stress conditions in real time;
and step 3: replacing crack test pieces with different specifications, and implementing the step 1 and the step 2;
and 4, step 4: and summarizing the relationship among the crack cracking time, the size of the crack and the loading force of the crack test piece with different specifications under the condition of different loading forces in the continuous stress process according to the data obtained in the steps 1, 2 and 3.
Example 3
The embodiment provides an experimental method for treating a tunnel lining structure crack, which comprises the following steps:
step 1: sequentially selecting test pieces with various crack specifications; mounting a test piece on a test bed; the crack specification is 1mm, 2 mm, 5 mm, 10 mm or 20 mm.
Step 2: preparing a repairing material; the repairing material is polymer-based gel and is prepared from the following materials in parts by weight: fly ash, metakaolin, a composite excitant, Portland cement and silica fume, wherein the ratio of the fly ash to the metakaolin to the silica fume is 14:65:10:10: 1; the composite excitant slurry is prepared from the following materials in parts by weight: the mixing ratio of the instant sodium silicate to the sodium hydroxide to the nano silicon dioxide is 8:1: 1.
And step 3: the method is used for simulating a treatment experiment of a lining crack under different water seepage conditions, and comprises the following specific steps: adjusting the seepage amount to be 250 ml, 500 ml and 800 ml per minute respectively, injecting the repairing material into the crack under the condition of each seepage amount, loading the tensile force to 1kN after the repairing material is initially set, and recording initial setting time, crack displacement and loading force readings of the repairing material under different seepage states respectively;
and 4, step 4: the method is used for simulating a treatment experiment under the condition that the lining crack is continuously stressed and cracked, and comprises the following specific steps: after the step 1 and the step 2 are implemented, injecting a repairing material into the crack, continuously loading a tensile force after the crack is initially set, wherein the loading rate is 20N/min, and recording initial setting time, the loaded tensile force and crack displacement in real time after the test piece cracks;
and 5: the method is used for simulating a treatment experiment of the lining crack under the action of double factors of water leakage and continuous stress cracking, and comprises the following specific steps: and (3) repeating the step (1) and the step (2), respectively testing under the condition of the three water seepage amounts in the step (3), injecting the repair slurry into the crack, continuously loading the tensile force when the repair slurry is initially set, keeping the loading rate at 20N/min, enabling the test piece to crack, and recording initial setting time, the loaded tensile force and crack displacement in real time.
Step 6: analyzing the repairing effect according to the measured experimental data, adjusting the mixing proportion of the repairing material, repeating the steps 1, 3, 4 and 5, and recording the experimental data to obtain the optimal mixing proportion of the repairing material, namely, the fly ash, the metakaolin, the composite exciting agent, the portland cement and the silica fume, which are 14:65:10:10: 1; the composite excitant slurry is prepared from the following materials in parts by weight: the quick dissolving sodium silicate, sodium hydroxide and nano silicon dioxide are 8:1: 1.
The tunnel lining structure crack treatment simulation experiment method provides a tunnel lining structure crack repair treatment experiment simulation method under the double factors of water seepage and continuous stress cracking. And an appropriate material ratio and a water-cement ratio are found through experiments, so that the crack repairing material which is cheap and has a good repairing effect is provided.
Claims (3)
1. A tunnel lining structure crack treatment experimental method is characterized by comprising the following steps:
step 1: sequentially selecting test pieces with various crack specifications; mounting a test piece on a test bed;
step 2: preparing a repairing material;
and step 3: the method is used for simulating a treatment experiment of a lining crack under different water seepage conditions, and comprises the following specific steps: adjusting the water seepage amount, injecting the repairing material into the crack under each water seepage amount condition, loading tension after the repairing material is initially set, and respectively recording the initial setting time, crack displacement and loading force readings of the repairing material under different water seepage states;
and 4, step 4: the method is used for simulating a treatment experiment under the condition that the lining crack is continuously stressed and cracked, and comprises the following specific steps: after the step 1 and the step 2 are implemented, injecting a repairing material into the crack, continuously loading a tensile force after the initial setting is finished, and recording initial setting time, the loaded tensile force and crack displacement in real time after the test piece cracks;
and 5: the method is used for simulating a treatment experiment of the lining crack under the action of double factors of water leakage and continuous stress cracking, and comprises the following specific steps: repeating the step 1 and the step 2, respectively injecting the repair slurry into the crack under the condition of each water seepage amount in the step 3, continuously loading the tensile force after the repair slurry is initially set so as to crack the test piece, and recording initial setting time, loaded tensile force and crack displacement in real time;
step 6: analyzing the repairing effect according to the measured experimental data, adjusting the mixing proportion of the repairing material, repeating the steps 1, 3, 4 and 5, and recording the experimental data to obtain the optimal mixing proportion of the repairing material;
the concrete implementation of the experimental method for treating the cracks of the tunnel lining structure adopts the following experimental simulation platform for treating the cracks of the tunnel lining structure, the experimental simulation platform comprises a test bench, a displacement meter, two independent arc-shaped steel grooves and a hinged support arranged on the test bench, and the cross sections of the arc-shaped steel grooves are rectangular; the lower surfaces of one ends of the two arc-shaped steel grooves are connected with the hinged support, and the two arc-shaped steel grooves jointly form an arc-shaped workpiece; the other ends of the two arc-shaped steel grooves are connected with the test bed through supporting rods, and the supporting rods are hinged with the arc-shaped steel grooves; force loading devices are arranged below the other ends of the two arc-shaped steel grooves, and a tension dynamometer is arranged between the arc-shaped steel frame and the corresponding force loading device; one ends of the two arc-shaped steel grooves, which are close to the hinged support, are provided with test piece fixing devices; the displacement meter is mounted on the test piece.
2. The experimental method for treating the cracks of the tunnel lining structure as claimed in claim 1, wherein the repairing material in the step 2 is polymer-based gel prepared according to the following materials in parts by weight: 10-16 parts of fly ash, metakaolin, a composite excitant, portland cement and silica fume: 60-70: 8-13: 8-13: 1 to 2.
3. The experimental method for treating the cracks of the tunnel lining structure as claimed in claim 2, wherein the composite activator slurry is prepared from the following materials in parts by weight: 75-85% of instant sodium silicate, namely sodium hydroxide and nano silicon dioxide: 5-15: 5 to 15.
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| CN201810908356.3A CN109238844B (en) | 2016-07-08 | 2016-07-08 | Tunnel lining structure crack treatment experimental method |
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| CN201610537559.7A CN106248480B (en) | 2016-07-08 | 2016-07-08 | Tunnel lining structure crack treatment imitative experiment platform and experimental method |
| CN201810908356.3A CN109238844B (en) | 2016-07-08 | 2016-07-08 | Tunnel lining structure crack treatment experimental method |
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| CN201610537559.7A Division CN106248480B (en) | 2016-07-08 | 2016-07-08 | Tunnel lining structure crack treatment imitative experiment platform and experimental method |
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| CN201810908356.3A Expired - Fee Related CN109238844B (en) | 2016-07-08 | 2016-07-08 | Tunnel lining structure crack treatment experimental method |
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| CN109827833B (en) * | 2019-03-21 | 2021-03-16 | 招商局重庆交通科研设计院有限公司 | Preparation method of experimental test piece for water seepage characteristic of cracked tunnel lining structure |
| CN114199686A (en) * | 2021-11-05 | 2022-03-18 | 武汉二航路桥特种工程有限责任公司 | Model test device and method for disease evolution law of tunnel lining of operation highway |
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|---|---|
| CN109238844A (en) | 2019-01-18 |
| CN106248480A (en) | 2016-12-21 |
| CN106248480B (en) | 2019-01-22 |
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