CN113376357A - Test device and method for simulating deformation and damage of tunnel lining in extreme environment - Google Patents
Test device and method for simulating deformation and damage of tunnel lining in extreme environment Download PDFInfo
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Abstract
A test device for simulating tunnel lining deformation damage under extreme environment is composed of a closed bottom plate, a closed side plate and a closed top plate which are perpendicular to each other to form a rectangular closed space, rectangular surrounding rocks stacked on the closed bottom plate, a tunnel model passing through the inside of the surrounding rocks in length direction, several groups of surrounding rock pressure boxes arranged at intervals at the bottom of the surrounding rocks in length direction, a surrounding rock top plate arranged at the top of the surrounding rocks, a seepage main pipe arranged at the bottom of the closed top plate, seepage branch pipes arranged between the seepage main pipe and the surrounding rock top plate, a humidity regulator and louver fans arranged at the inlet and outlet ends of the tunnel model, an upper temperature control fluid output pipe, a lower temperature control fluid output pipe, a temperature control fluid shunt pipe, an upper temperature control fluid output pipe and a heating device communicated with each other, and a lower temperature control fluid output pipe communicated with the heating device through a temperature control fluid return pipe, the adaptability and the operability are strong.
Description
Technical Field
The invention belongs to the technical field of disease treatment in tunnel engineering, and particularly relates to a test device and a test method for simulating a disease generation mechanism and a treatment effect in an extreme environment.
Background
In recent years, tunnel construction in China develops rapidly, but a plurality of problems still exist in construction and operation, particularly under the combined action of water and an extreme temperature field, tunnel lining diseases develop seriously, operating tunnels are mostly in a sub-health state, and prevention and control face certain difficulty.
In high-latitude cold areas such as inner Mongolia, Xinjiang and northeast China, the early tensile strength of concrete is very low, and the shrinkage cracks of the concrete are caused by large temperature difference in tunnel construction, and the cracks are further developed along with the reduction of the temperature of the concrete. And subsequently, due to repeated freeze thawing caused by temperature change, leakage occurs in the spring thawing period, and the leakage water causes various freezing injuries in winter, such as hanging ice edges on the top of a tunnel, hanging ice on side walls, freezing a road bed and the like. The water leakage and the freezing are mutually influenced and cause each other, and the service life and the driving safety of the concrete structure are seriously influenced.
The method is characterized in that the berrubin takes a new high-speed rail girder tunnel as an example, the construction reason caused by water leakage of the tunnel, the characteristics of the water leakage and the icing disease are analyzed and described, and corresponding solutions are provided for different disease parts. The method is characterized in that the winkles are treated by taking the frozen swelling cracking, block falling and other diseases of tunnel linings of the Wufengshan tunnel of the Jituo a kind of jade passenger special line as an example, the phenomena and reasons of the tunnel diseases are analyzed, the tunnel diseases are detected, the severity of defects is judged, and the corrugated steel plate lining treatment construction technology is provided. The problem of water leakage regulation of a certain tunnel of the railway of Mongolian collection package within Panhonggui and the like is a research object, the technology for regulating water leakage and freezing injury of the tunnel of the operation railway in the alpine region is explained and analyzed in the aspects of tunnel disease classification, generation reasons, regulation methods, effects and the like, and the regulation technology combining grouting and heating heat preservation is proved to have good implementation effect in the water leakage regulation in the alpine region.
The high temperature field takes a tunnel in a high temperature area in the south as a representative, the tunnel portal section of the high temperature field is in a high temperature and high humidity environment for a long time, and the tunnel portal section is repeatedly heated and wetted, so that the lining and the surrounding rock are degraded, cracks or crack expansion are generated, and the service life and the safety of the tunnel structure are influenced.
The aged culture establishes an incremental elastoplastic body expansion constitutive equation of a rock mass under the influence of humidity and temperature based on an incremental theory and a humidity stress field theory, and deduces a heat-humidity stress expression; according to on-site monitoring data of a certain tunnel, the temperature field and the humidity field of surrounding rocks, the thermal-humidity stress and seasonal change conditions are calculated, and the influence of the thermal conductivity and the thickness of different linings and rocks on the thermal-humidity stress is analyzed.
However, the current research is about the mechanism and the treatment measures of the diseases generated by the tunnel in the extreme temperature field, and although the construction and the design of the tunnel which is built and is not built have a certain reference value, the generation mechanism and the corresponding treatment measures of the diseases are different from place to place due to the difference of the conditions of the design standards, the temperature field, the hydrogeology and the like of each tunnel. In order to take targeted measures to cure tunnel diseases, the generation mechanism of the tunnel diseases must be scientifically and accurately analyzed, and important curing schemes are proposed accordingly. Therefore, the development of model tests of tunnel site environment and hydrogeological conditions has important scientific significance and engineering value for pertinently preventing and treating diseases under the condition of extreme temperature fields.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a test device and a test method which have strong operability, accurately control temperature and humidity and accurately simulate the disease generation mechanism and treatment effect under the extreme environment by combining the combined action of factors such as a tunnel model, a temperature field, a humidity field, the water leakage strength and position, surrounding rock conditions and the like.
The technical scheme for solving the technical problems is as follows: a cuboid enclosed space is formed by mutually vertical sealing bottom plates, sealing side plates and sealing top plates, cuboid surrounding rocks are piled on the sealing bottom plates, tunnel models penetrate through the inside of the surrounding rocks in the length direction, a plurality of groups of surrounding rock pressure boxes are arranged at intervals at the bottom of the surrounding rocks in the length direction, a surrounding rock top plate is arranged at the top of the surrounding rocks, a plurality of circles of seepage main pipes are horizontally arranged at the lower bottom of the sealing top plates, seepage branch pipes are arranged between the seepage main pipes and the surrounding rock top plate, humidity regulators and louver fans are arranged at the inlet and outlet ends of the tunnel models, a circle of upper temperature control fluid output pipe is arranged between the sealing top plates and the sealing side plates, a circle of lower temperature control fluid output pipe is arranged between the sealing bottom plates and the sealing side plates, a plurality of groups of temperature control fluid shunt pipes are arranged at intervals between the upper temperature control fluid output pipe and the lower temperature control fluid output pipe, and the upper temperature control fluid output pipe is communicated with a heating device, the lower temperature control fluid output pipe is communicated with the heating device through a temperature control fluid return pipe, the heating device, the seepage header pipe and the humidity controller are communicated with an external water tank, and the surrounding rock pressure box, the humidity controller, the heating device and the louver fan are electrically connected with the control device.
The automatic control type flow regulating valve and the flow sensor are arranged between the seepage main pipe and the external water tank, the automatic control type flow regulating valve and the flow sensor are arranged between the heating device and the external water tank, and the automatic control type flow regulating valve and the flow sensor are electrically connected with the control device.
The tunnel model of the invention is as follows: pouring a tunnel lining on the steel reinforcement framework, wherein a plurality of groups of strain gauges are arranged at the bottom of the arched structure in the tunnel lining at intervals, a plurality of groups of model pressure boxes are arranged at the bottom of the arched structure outside the tunnel lining at intervals along the longitudinal uniform distribution of the tunnel lining, and the strain gauges, the temperature and humidity sensors and the model pressure boxes are electrically connected with a control device.
The control device of the invention is: the output end of a main control circuit for controlling the whole control device is connected with the input end of the display circuit, the output end of the main control circuit is connected with the input end of the temperature, humidity and seepage control circuit, the output end of the data acquisition circuit is connected with the input end of the A/D conversion circuit, the A/D conversion circuit is connected with the signal amplification circuit, and the A/D conversion circuit is connected with the main control circuit.
The main control circuit of the invention is as follows: pins 10 to 17, pins 29 to 31 and pins 5 to 7 of an integrated circuit U2 are connected with a temperature, humidity and seepage control circuit, pins 18, pins 19, pins 42 and pins 43 of an integrated circuit U2 are connected with a signal acquisition circuit, pins 20 and pins 39 of an integrated circuit U2 are connected with an A/D conversion circuit, pins 45, 46, pins 21, pins 22, pins 25 to 28 and pins 2 to 4 of an integrated circuit U2 are connected with a display circuit, pins 23, pins 35, pins 47 and 8 of an integrated circuit U2 are grounded, and pins 24, pins 36, pins 48 and pins 9 of an integrated circuit U2 are connected with a power supply; the model number of the integrated circuit U2 is STM32F103CBT 6.
The temperature, humidity and seepage control circuit of the invention is as follows: the pin 1 of the integrated circuit U1 is connected with a power supply through a resistor R1, the pin 2 is connected with the power supply through a resistor R2, one end of a 6-pin crystal oscillator Y1 and one end of a capacitor C1, the other end of a 5-pin crystal oscillator Y1 and one end of a capacitor C2, pins 18 to 11, 9, 24, 23, 21, 22 and 8 of the integrated circuit U1 are sequentially connected with pins 10 to 17, 29 to 31 and 5 to 7 of the integrated circuit U2, pins 20, 19, 31, 3, 7 and 29 of the integrated circuit U1 are grounded, pins 10, 32, 4 and 30 of the integrated circuit U1 are connected with the power supply, and the other ends of the capacitor C1 and the capacitor C2 are grounded; the model of the integrated circuit U1 is TVP5150AM 1.
The data acquisition circuit of the invention is: the pin 18 of the integrated circuit U2 is connected with the pin 2 of the temperature and humidity sensor, the pin 1 and the pin 3 of the temperature and humidity sensor are grounded, the pin 19 of the integrated circuit U2 is connected with one end of a resistor R4 and one end of a resistor R3, the other end of the resistor R4 and one end of a resistor R6 are grounded, the other end of a resistor R6 is connected with one end of a resistor R5 and the pin 19 of the integrated circuit U2, the other point of the resistor R5 and the other end of the resistor R3 are connected with a power supply, the pin 13 and the pin 3 of the flow sensor U3 are sequentially connected with the pin 43 and the pin 42 of the integrated circuit U2, the pin 16, the pin 7 and the pin 8 of the flow sensor U3 are grounded, and the pin 10, the pin 9, the pin 12, the pin 14, the pin 15, the pin 11, the pin 1, the pin 5, the pin 2 and the pin 4 of the flow sensor U3 are connected with a pin connector P2.
The test method of the test device for simulating deformation and damage of the tunnel lining in the extreme environment comprises the following steps:
s1, determining simulation field parameters according to geometrical parameters such as the length, the burial depth and the cross section size of the tunnel under construction or not under construction, and construction parameters such as concrete strength and pouring temperature;
s2, assembling the device, sequentially numbering the pressure boxes and the strain gauges, setting temperature and humidity parameters of a control device, and simultaneously carrying out simulation construction on weak areas of the tunnel structure such as construction joints, deformation joints and the like;
s3, aiming at the possible leakage position, embedding a seepage branch pipe for simulation, and setting the seepage quantity of the seepage branch pipe through a control device;
s4, testing according to the preset temperature, humidity parameters and seepage flow rate by opening the control device, and observing data fed back by the display of the control device;
and S5, observing the pressure and strain data of each number fed back by the display of the control device, selecting proper treatment measures according to the data of each position, repeating the test process again, observing the treatment effect, and further selecting the treatment measures.
Compared with the prior art, the invention has the following advantages:
1. according to the tunnel and surrounding rock structure model adopted by the invention, according to on-site geological survey data, a similar principle is adopted, surrounding rock covering conditions are simulated indoors, a tunnel seepage strength control system is matched to restore the environment of a tunnel site area, the outdoor workload is reduced, and the method has foresight property and economical efficiency compared with the method for treating the diseases of the tunnel in the tunnel site area.
2. According to the temperature monitoring data of the tunnel site area, the temperature control system is adopted to simulate the temperature field of the tunnel site area indoors. The temperature condition can be preset, the stress of the tunnel structure under the action of the temperature field can be explored, possible diseases can be explored, and the method has good design guidance significance and certain prospect.
3. Aiming at the high-temperature and high-humidity conditions in southern areas, the humidity control system is matched with the temperature control system to truly reduce the environment of the tunnel portal, the stress changes of the portal surrounding rocks and the lining under different surrounding rocks and supporting conditions can be simulated, the mechanism for generating the hot and wet diseases at the portal section of the tunnel is explored, corresponding measures are further adopted to improve the stress conditions and observe the response, a basis is provided for the disease treatment of the portal section tunnel under the high-temperature and high-humidity environment, and the summary rule of the experimental conditions can be further changed.
4. The method has certain guiding significance for treating tunnel disease measures generated by the combined action of humidity and extreme temperature fields, and has strong adaptability and operability.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of the tunnel model 4 in fig. 1.
Fig. 3 is an electrical schematic block diagram of the control device 8 of the present invention.
Fig. 4 is a schematic diagram of the electronics of the control device 8 of the present invention.
In the figure: 1. a closed bottom plate; 2. a lower temperature control fluid output pipe; 3. a surrounding rock pressure cell; 4. a tunnel model; 5. surrounding rocks; 6. a temperature control fluid return line; 7. a heating device; 8. a control device; 9. a humidity controller; 10. a main seepage pipe; 11. a seepage branch pipe; 12. a surrounding rock roof; 13. closing the top plate; 14. closing the side plate; 15. an upper temperature control fluid output pipe; 16. a temperature control fluid shunt tube; 4-1, a steel reinforcement framework; 4-2, strain gauges; 4-3, tunnel lining; 4-4, a temperature and humidity sensor; 4-5, and model pressure box.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the present invention is not limited to these examples.
Example 1
In fig. 1 and 2, the test device for simulating deformation and damage of the tunnel lining in an extreme environment, which is disclosed by the invention, is characterized in that a rectangular closed space is formed by mutually and vertically arranging a closed bottom plate 1, a closed side plate 14 and a closed top plate 13, so that the whole test process is not influenced by external temperature and humidity and is completely simulated according to set parameters. The method comprises the following steps that cuboid surrounding rocks 5 are piled up on a closed bottom plate 1, a tunnel model 4 penetrates through the inside of the surrounding rocks 5 in the length direction, the tunnel model 4 of the embodiment is formed by connecting a steel reinforcement framework 4-1, strain gauges 4-2, a tunnel lining 4-3, temperature and humidity sensors 4-4 and a model pressure box 4-5, the tunnel lining 4-3 is poured on the steel reinforcement framework 4-1, construction joints and deformation joints are concerned during pouring, and weak parts caused by freezing injury are simulated really. The bottom of the inner arched structure of the tunnel lining 4-3 is provided with a plurality of groups of strain gauges 4-2 at intervals, temperature and humidity sensors 4-4 are uniformly distributed along the longitudinal direction of the tunnel lining 4-3, the bottom of the outer arched structure of the tunnel lining 4-3 is provided with a plurality of groups of model pressure boxes 4-5 at intervals, the strain gauges 4-2, the temperature and humidity sensors 4-4 and the model pressure boxes 4-5 are electrically connected with a control device 8, the strain gauges 4-2 and the model pressure boxes 4-5 transmit data to the control device 8, the control device 8 displays the data, and a tester takes corresponding treatment measures according to the data. And numbering the strain gauge 4-2 and the model pressure box 4-5, so that treatment measures can be taken conveniently according to corresponding positions during later-stage tests.
A plurality of groups of surrounding rock pressure boxes 3 are arranged at intervals at the bottom of the surrounding rock 5 in the length direction, a surrounding rock top plate 12 is arranged at the top of the surrounding rock pressure boxes 3, the surrounding rock pressure boxes 3 are numbered, a plurality of circles of seepage main pipes 10 are horizontally arranged at the lower bottom of a closed top plate 13, seepage branch pipes 11 are embedded in the surrounding rock top plate 12 in advance according to simulated seepage water positions (the positions are typical positions for freeze-thaw diseases), the pipeline flow is transmitted to a control device 8 according to a flow sensor, the control device is realized through a data accurate automatic control type flow regulating valve preset by the control device 8, water seeped from the seepage branch pipes 11 enters the surrounding rock 5 and further seeps, the freeze-thaw disasters are generated by the action of a limit temperature field in the follow-up real simulation, and necessary conditions for preventing the diseases by adopting treatment measures. The seepage branch pipe 11 is communicated with the seepage main pipe 10.
The inlet and outlet ends of the tunnel model 4 are respectively provided with a humidity regulator 9 and a louver, a control device 8 controls the humidity regulator 9 to supply humidity according to a preset value, the louver arranged below the humidity controller 9 enables moisture to be further diffused into the hole to achieve the purpose of moderate control in the tunnel model 4, a ring of temperature control fluid output pipe 15 is arranged between the closed top plate 13 and the closed side plate 14, a ring of lower temperature control fluid output pipe 2 is arranged between the closed bottom plate 1 and the closed side plate 14, a plurality of temperature control fluid shunt pipes 16 are arranged between the upper temperature control fluid output pipe 15 and the lower temperature control fluid output pipe 2, the upper temperature control fluid output pipe 15 is communicated with a heating device 7, the control device 8 controls the heating device 7 to heat the temperature control fluid to a preset temperature according to the preset temperature, and controls the self-control flow regulating valve to enable the temperature control fluid to flow through the upper temperature control fluid output pipe 15, A temperature control fluid shunt pipe 16, and finally, a lower temperature control fluid output pipe 2 returns to the heating device 7 through a temperature control fluid return pipe 6 for circulating heating, the heating device 7, the seepage header pipe 10 and the humidity controller 9 are all communicated with an external water tank, in order to control the flow, a self-control flow regulating valve and a flow sensor are arranged between the seepage header pipe 10 and the external water tank, a self-control flow regulating valve and a flow sensor are arranged between the heating device 7 and the external water tank, the self-control flow regulating valve and the flow sensor are electrically connected with the control device 8, the surrounding rock pressure box 3, the humidity controller 9, the heating device 7 and the louver fan are electrically connected with the control device 8, and the above components are integrally controlled by the control device 8.
The device controls the water yield of the seepage branch pipe 11 through the control device 8, and further simulates the underground water condition of the tunnel site area. When the underground water conditions of the surrounding rock of the simulated field and the tunnel site area are close, the working of the temperature control fluid output pipe is controlled by controlling the self-control flow regulating valve, and the temperature in the closed space is controlled. Meanwhile, the temperature and humidity in the tunnel are fed back to the control device 8 through the distributed temperature and humidity sensors 4-4, the acting force generated by the tunnel lining 4-3 and the surrounding rock 5 under the combined action of extreme temperature and humidity and underground water is fed back to the control device 8 in real time through the pressure box and the strain gauge 4-2, and the change process of pressure and strain is recorded. The control device 8 controls the supply amount of the temperature control fluid and the humidity of the humidity controller 9 according to the temperature information fed back by the temperature and humidity sensors 4-4, so that the length temperature fields of the surrounding rock 5 and the tunnel model 4 are close to the temperature field of the tunnel site area. And when the temperature and the humidity are regulated, the seepage branch pipe 11 continues to supply underground water, the field condition is truly simulated, the experiment is stopped when the pressure around the lining reaches a certain value, the data is processed, and the experiment is updated.
The device can simulate the tunnel lining deformation and damage condition under a single working condition (under the action of temperature or humidity), also can simulate the tunnel lining deformation and damage condition under multiple working conditions (under the combined action of temperature and humidity), and takes corresponding treatment measures according to the damage condition under different working conditions.
In fig. 3, the control device 8 of the present invention is formed by linking a main control circuit, a data acquisition circuit, an a/D conversion circuit, a signal amplification circuit, a display circuit, and a temperature, humidity and seepage control circuit, wherein an output terminal of the main control circuit for controlling the entire control device 8 is connected to an input terminal of the display circuit, an output terminal of the main control circuit is connected to an input terminal of the temperature, humidity and seepage control circuit, an output terminal of the data acquisition circuit is connected to an input terminal of the a/D conversion circuit, the a/D conversion circuit is connected to the signal amplification circuit, and the a/D conversion circuit is connected to the main control circuit.
In fig. 4, the main control circuit of the present invention is formed by an integrated circuit U2, the model of which is STM32F103CBT6, integrated circuit U2. Pins 10 to 17, pins 29 to 31 and pins 5 to 7 of an integrated circuit U2 are connected with a temperature, humidity and seepage control circuit, pins 18, pins 19, pins 42 and pins 43 of the integrated circuit U2 are connected with a signal acquisition circuit, pins 20 and pins 39 of the integrated circuit U2 are connected with an A/D conversion circuit, pins 45, 46, pins 21, pins 22, pins 25 to 28 and pins 2 to 4 of the integrated circuit U2 are connected with a display circuit, pins 23, pins 35, pins 47 and pins 8 of the integrated circuit U2 are grounded, and pins 24, pins 36, pins 48 and pins 9 of the integrated circuit U2 are connected with a power supply. The main control circuit adjusts the humidity of the humidity controller 9 and the temperature of the temperature control fluid controlled by the heating device 7 according to the temperature and humidity information, the pressure value and the strain value acquired by the signal acquisition circuit, so as to adjust the temperature and the humidity in the closed space and achieve the required conditions for the test.
The temperature, humidity and seepage control circuit is formed by connecting an integrated circuit U1, a resistor R1, a resistor R2, a capacitor C1, a capacitor C2 and a crystal oscillator Y1, and the model of the integrated circuit U1 is TVP5150AM 1. A pin 1 of an integrated circuit U1 is connected with a power supply through a resistor R1, a pin 2 is connected with the power supply through a resistor R2, one end of a 6-pin crystal oscillator Y1, one end of a capacitor C1, the other end of a 5-pin crystal oscillator Y1 and one end of a capacitor C2, pins 18 to 11, 9, 24, 23, 21, 22 and 8 of the integrated circuit U1 are sequentially connected with pins 10 to 17, pins 29 to 31 and pins 5 to 7 of the integrated circuit U2, pins 20, 19, 31, 3, 7 and 29 of the integrated circuit U1 are connected with the ground, pins 10, 32, 4 and 30 of the integrated circuit U1 are connected with the power supply, and the other ends of the capacitor C1 and the capacitor C2 are connected with the ground. The main control circuit controls the temperature and humidity and the seepage control circuit adjusts the flow of the self-control flow adjusting valve, the humidity of the humidity controller 9 and the temperature of the temperature control fluid controlled by the heating device 7.
The data acquisition circuit is formed by connecting a temperature and humidity sensor, a pressure sensor and a flow sensor U3, wherein 18 pins of an integrated circuit U2 are connected with 2 pins of the temperature and humidity sensor, 1 pin and 3 pins of the temperature and humidity sensor are grounded, 19 pins of an integrated circuit U2 are connected with one end of a resistor R4 and one end of a resistor R3, the other end of a resistor R4 and one end of a resistor R6 are grounded, the other end of a resistor R6 is connected with one end of a resistor R5 and 19 pins of an integrated circuit U2, the other point of a resistor R5 and the other end of a resistor R3 are connected with a power supply, 13 pins and 3 pins of the flow sensor U3 are sequentially connected with 43 pins and 42 pins of an integrated circuit U2, 16 pins of the flow sensor U3 are connected with the power supply, 7 pins and 8 pins are grounded, and 10 pins, 9 pins, 12 pins, 14 pins, 15 pins, 11 pins, 1 pin, 5 pin, 2 pin and 4 pin plug pin connectors P2 of the flow sensor U3. The data acquisition circuit feeds back the data of the flow sensor, the temperature and humidity sensor and the pressure sensor to the main control circuit, and the main control circuit transmits the data to the display circuit and judges whether the flow of the self-control flow regulating valve, the humidity of the humidity controller 9 and the temperature of the temperature control fluid controlled by the heating device 7 need to be regulated according to the preset values.
The A/D conversion circuit is composed of an integrated circuit U4, and the model of the integrated circuit U4 is ADC-8. The pins 4 and 5 of the integrated circuit U4 are sequentially connected with the pins 20 and 39 of the integrated circuit U2, and the pin 1 of the integrated circuit U4 is connected with the signal amplifying circuit, the pin 2 is connected with the power supply, and the pins 3 and 8 are grounded.
The signal amplifying circuit is formed by connecting an operational amplifier AR1, a diode D5, a diode D6, a resistor R8-a resistor R11, a capacitor C8 and a capacitor C9, wherein the forward input end of the operational amplifier AR1 is grounded through a resistor R8, the reverse input end of the operational amplifier AR1 is grounded through a resistor R10 and is connected with one end of a capacitor C8, the output end of the operational amplifier AR1 is connected with one end of a capacitor C9, the negative electrode of the diode D5, the positive electrode of the diode D6, the pin 1 of the integrated circuit U4, the positive electrode of the diode D5 and the negative electrode of the diode D6 through a resistor R11 and the other end of the capacitor C9, and the other end of the capacitor C8 is grounded.
The display circuit is composed of a liquid crystal display screen, wherein pins 1 and 16 of the liquid crystal display screen are grounded, pins 2 and 15 are connected with a power supply, pin 3 is grounded through a resistor R7, and pins 4 to 14 of the liquid crystal display screen are sequentially connected with pins 2 to 4, pin 45, pin 46, pin 21, pin 22 and pin 25 to pin 28 of an integrated circuit U2.
The test method of the test device for simulating deformation and damage of the tunnel lining in the extreme environment comprises the following steps:
s1, determining simulation field parameters according to geometrical parameters such as the length, the burial depth and the cross section size of the tunnel under construction or not under construction, and construction parameters such as concrete strength and pouring temperature;
s2, assembling the device, sequentially numbering the pressure boxes and the strain gauges, setting temperature and humidity parameters of the control device 8, and simultaneously carrying out simulation construction on weak areas of the tunnel structure such as construction joints, deformation joints and the like;
s3, aiming at the possible leakage position, embedding a seepage branch pipe 11 for simulation, and setting the seepage quantity of the seepage branch pipe through a control device 8;
s4, testing according to the preset temperature, humidity parameters and seepage flow rate by opening the control device 8, and observing data fed back by the display of the control device 8;
s5, observing the pressure and strain data at each number fed back by the display of the control device 8, and selecting proper treatment measures according to the data at each position, such as: changing lining strength or thickness, locally draining water, grouting, arranging a heat preservation layer, locally or fully heating, repeating the test process again, observing treatment effect, and further selecting treatment measures.
Claims (8)
1. The utility model provides a test device that tunnel lining warp destruction under simulation extreme environment which characterized in that: a cuboid enclosed space is formed by mutually perpendicular a closed bottom plate (1), a closed side plate (14) and a closed top plate (13), cuboid surrounding rocks (5) are piled on the closed bottom plate (1), a tunnel model (4) penetrates through the inside of the surrounding rocks (5) in the length direction, a plurality of groups of surrounding rock pressure boxes (3) are arranged at intervals at the bottom of the surrounding rocks (5) in the length direction, a surrounding rock top plate (12) is arranged at the top of the surrounding rocks, a plurality of circles of seepage header pipes (10) are horizontally arranged at the bottom of the closed top plate (13), seepage branch pipes (11) are arranged between the seepage header pipes (10) and the surrounding rock top plate (12), humidity regulators (9) and louver fans are arranged at the inlet and outlet ends of the tunnel model (4), an upper circle of temperature control fluid output pipe (15) is arranged between the closed top plate (13) and the closed side plate (14), a circle of lower temperature control fluid output pipe (2) is arranged between the closed bottom plate (1) and the closed side plate (14), a plurality of groups of temperature control fluid shunt tubes (16) are arranged between the upper temperature control fluid output tube (15) and the lower temperature control fluid output tube (2) at intervals, the upper temperature control fluid output tube (15) is communicated with the heating device (7), the lower temperature control fluid output tube (2) is communicated with the heating device (7) through a temperature control fluid return tube (6), the heating device (7), the seepage header pipe (10) and the humidity controller (9) are all communicated with an external water tank, and the surrounding rock pressure box (3), the humidity controller (9), the heating device (7) and the louver are electrically connected with the control device (8).
2. The test device for simulating the deformation and damage of the tunnel lining in the extreme environment according to claim 1, wherein: and a self-control flow regulating valve and a flow sensor are arranged between the seepage header pipe (10) and the external water tank, a self-control flow regulating valve and a flow sensor are arranged between the heating device (7) and the external water tank, and the self-control flow regulating valve and the flow sensor are electrically connected with the control device (8).
3. The test device for simulating deformation and damage of the tunnel lining in the extreme environment according to claim 1, wherein the tunnel model (4) comprises: the tunnel lining (4-3) is poured on the steel reinforcement framework (4-1), a plurality of groups of strain gauges (4-2) are arranged at the bottom of the inner arch structure of the tunnel lining (4-3) at intervals, temperature and humidity sensors (4-4) are longitudinally and uniformly distributed along the tunnel lining (4-3), a plurality of groups of model pressure boxes (4-5) are arranged at the bottom of the outer arch structure of the tunnel lining (4-3) at intervals, and the strain gauges (4-2), the temperature and humidity sensors (4-4) and the model pressure boxes (4-5) are electrically connected with the control device (8).
4. The test device for simulating tunnel lining deformation and damage in extreme environments as claimed in claim 1, wherein the control device (8) is: the output end of a main control circuit for controlling the whole control device (8) is connected with the input end of the display circuit, the output end of the main control circuit is connected with the input end of the temperature, humidity and seepage control circuit, the output end of the data acquisition circuit is connected with the input end of the A/D conversion circuit, the A/D conversion circuit is connected with the signal amplification circuit, and the A/D conversion circuit is connected with the main control circuit.
5. The test device for simulating tunnel lining deformation damage in extreme environments according to claim 4, wherein the main control circuit comprises: pins 10 to 17, pins 29 to 31 and pins 5 to 7 of an integrated circuit U2 are connected with a temperature, humidity and seepage control circuit, pins 18, pins 19, pins 42 and pins 43 of an integrated circuit U2 are connected with a signal acquisition circuit, pins 20 and pins 39 of an integrated circuit U2 are connected with an A/D conversion circuit, pins 45, 46, pins 21, pins 22, pins 25 to 28 and pins 2 to 4 of an integrated circuit U2 are connected with a display circuit, pins 23, pins 35, pins 47 and 8 of an integrated circuit U2 are grounded, and pins 24, pins 36, pins 48 and pins 9 of an integrated circuit U2 are connected with a power supply; the model number of the integrated circuit U2 is STM32F103CBT 6.
6. The test device for simulating tunnel lining deformation and damage in extreme environments according to claim 4, wherein the temperature, humidity and seepage control circuit comprises: the pin 1 of the integrated circuit U1 is connected with a power supply through a resistor R1, the pin 2 is connected with the power supply through a resistor R2, one end of a 6-pin crystal oscillator Y1 and one end of a capacitor C1, the other end of a 5-pin crystal oscillator Y1 and one end of a capacitor C2, pins 18 to 11, 9, 24, 23, 21, 22 and 8 of the integrated circuit U1 are sequentially connected with pins 10 to 17, 29 to 31 and 5 to 7 of the integrated circuit U2, pins 20, 19, 31, 3, 7 and 29 of the integrated circuit U1 are grounded, pins 10, 32, 4 and 30 of the integrated circuit U1 are connected with the power supply, and the other ends of the capacitor C1 and the capacitor C2 are grounded; the model of the integrated circuit U1 is TVP5150AM 1.
7. The test device for simulating tunnel lining deformation and damage in extreme environments according to claim 4, wherein the data acquisition circuit comprises: the pin 18 of the integrated circuit U2 is connected with the pin 2 of the temperature and humidity sensor, the pin 1 and the pin 3 of the temperature and humidity sensor are grounded, the pin 19 of the integrated circuit U2 is connected with one end of a resistor R4 and one end of a resistor R3, the other end of the resistor R4 and one end of a resistor R6 are grounded, the other end of a resistor R6 is connected with one end of a resistor R5 and the pin 19 of the integrated circuit U2, the other point of the resistor R5 and the other end of the resistor R3 are connected with a power supply, the pin 13 and the pin 3 of the flow sensor U3 are sequentially connected with the pin 43 and the pin 42 of the integrated circuit U2, the pin 16, the pin 7 and the pin 8 of the flow sensor U3 are grounded, and the pin 10, the pin 9, the pin 12, the pin 14, the pin 15, the pin 11, the pin 1, the pin 5, the pin 2 and the pin 4 of the flow sensor U3 are connected with a pin connector P2.
8. The test method for simulating the tunnel lining deformation damage test device in the extreme environment as claimed in any one of the claims 1 to 7 comprises the following steps:
s1, determining simulation field parameters according to geometrical parameters such as the length, the burial depth and the cross section size of the tunnel under construction or not under construction, and construction parameters such as concrete strength and pouring temperature;
s2, assembling the device, numbering the pressure boxes and the strain gauges in sequence, setting temperature and humidity parameters of the control device (8), and simultaneously carrying out simulation construction on weak areas of the tunnel structure such as construction joints, deformation joints and the like;
s3, aiming at the possible leakage position, embedding a seepage branch pipe (11) for simulation, and setting the seepage quantity of the seepage branch pipe through a control device (8);
s4, according to the opening of the control device (8), carrying out a test according to preset temperature, humidity parameters and seepage flow, and observing data fed back by a display of the control device (8);
s5, observing the pressure and strain data at each number fed back by the display of the control device (8), selecting proper treatment measures according to the data at each position, repeating the test process again, observing the treatment effect, and further selecting the treatment measures.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114486321A (en) * | 2022-04-18 | 2022-05-13 | 中国飞机强度研究所 | Method for representing similarity of high-temperature environment tests of internal field and external field of airplane test |
| CN117554412A (en) * | 2023-11-01 | 2024-02-13 | 中国铁道科学研究院集团有限公司 | Multifunctional test device for simulating freezing process of tunnel drainage system in cold region |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486321A (en) * | 2022-04-18 | 2022-05-13 | 中国飞机强度研究所 | Method for representing similarity of high-temperature environment tests of internal field and external field of airplane test |
| CN114486321B (en) * | 2022-04-18 | 2022-06-24 | 中国飞机强度研究所 | Similarity characterization method for high-temperature environment test of inner field and outer field of airplane test |
| CN117554412A (en) * | 2023-11-01 | 2024-02-13 | 中国铁道科学研究院集团有限公司 | Multifunctional test device for simulating freezing process of tunnel drainage system in cold region |
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