CN111879536A - Test device and method for simulating operation vibration of subway tunnel train - Google Patents
Test device and method for simulating operation vibration of subway tunnel train Download PDFInfo
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- CN111879536A CN111879536A CN202010864769.3A CN202010864769A CN111879536A CN 111879536 A CN111879536 A CN 111879536A CN 202010864769 A CN202010864769 A CN 202010864769A CN 111879536 A CN111879536 A CN 111879536A
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- G01M7/00—Vibration-testing of structures; Shock-testing of structures
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Abstract
The invention discloses a test device and a method for simulating subway tunnel train operation vibration. The dynamic signal testing and analyzing system comprises a model box, a tunnel model, a load loading device, a sensor group and a dynamic signal testing and analyzing system, wherein the model box is filled with soil, the tunnel model is embedded in a soil layer in the model box, the load loading device is used for applying train shock excitation load, the sensor group is embedded in the soil layer in the model box and on the tunnel model, and the dynamic signal testing and analyzing system is arranged outside the model box. The invention can simulate the dynamic response of the tunnel structure and the surrounding stratum caused by train operation under different tunnel burial depths and different stratum water contents more truly, and can provide an effective and feasible test platform for researching the vibration response of the tunnel structure and the surrounding stratum caused by subway operation under different geological environments and engineering conditions.
Description
Technical Field
The invention relates to a test device for underground engineering, in particular to a test device and a method for simulating operation vibration of a subway tunnel train.
Background
With the acceleration of the urbanization process of China, urban rail transit systems develop vigorously, subways are used as important components of the urban rail transit systems, and a series of environmental vibration problems caused by subway train operation are brought while urban traffic pressure is relieved, urban economic development is promoted. If the subway tunnel structure is under the long-term cyclic load effect of train, will arouse the subside deformation of tunnel basement soil layer certainly, lead to tunnel structure to appear uneven settlement, bring the potential threat for the safe operation of train, simultaneously, the vibration that arouses by the train operation can be transmitted to the earth's surface through tunnel structure, country rock with the form of ripples, arouse the vibration and the noise of regional earth's surface building along the line, bring the influence for resident's normal life. Therefore, the development of experimental research on the subway train operation vibration problem has important guiding significance for exploring subway operation vibration propagation and influence mechanism on a tunnel structure.
The existing test device for subway or train operation vibration considers the situation of train vibration source moving loading less, and along with the acceleration of subway traffic construction, more engineering problems to be solved appear, but the research on the related problems still mainly takes on site test, numerical simulation and theoretical analysis as main points at present, but the three methods all have respective limitations, especially the related influence factors are increased continuously, for example, for a saturated or unsaturated soil stratum containing underground water, the three methods are difficult to accurately describe the environmental vibration induced by train operation and the accumulated settlement change characteristics of a tunnel. Therefore, more indoor model tests with low economic cost and high reliability should be developed or designed at present to make up for the defects of the existing research method.
Disclosure of Invention
In order to solve the above-mentioned defects in the prior art, the present invention aims to provide a test device and a method for simulating subway tunnel train operation vibration, which can simulate the vibration of the surrounding strata and the accumulated settlement change of the tunnel structure induced by the subway train operation more truly. The invention can simulate the dynamic response of the tunnel structure and the surrounding stratum caused by train operation under different tunnel burial depths and different stratum water contents more truly, and can provide an effective and feasible test platform for researching the vibration response of the tunnel structure and the surrounding stratum caused by subway operation under different geological environments and engineering conditions.
The invention is realized by the following technical scheme.
The test device for simulating the operation vibration of the subway tunnel train provided by the embodiment of the invention comprises a model box, a tunnel model, load loading equipment, a sensor group and a dynamic signal test analysis system;
the model box is filled with soil, the tunnel model is embedded in the soil inside the model box, and load loading equipment is arranged in the tunnel model and comprises a rigid cross beam and a plurality of vibration exciters positioned below the rigid cross beam; the tunnel model is internally provided with strain gauges, a soil body is internally provided with a sensor group, the dynamic signal testing and analyzing system is connected with the sensor group, and the strain gauges and the sensor group are connected with the dynamic signal testing and analyzing system; the moving loading effect of the train in the tunnel model is simulated through the equal time interval loading of each vibration exciter, and the dynamic signal testing and analyzing system obtains the dynamic response of a strain gauge monitoring tunnel model lining structure and a sensor group monitoring soil body under the action of the vibration load of the subway tunnel train, so that the influence of the tunnel burial depth and the water content of the soil body on the operation vibration of the subway tunnel train is obtained.
With respect to the above technical solutions, the present invention has a further preferable solution:
furthermore, the model box is formed by assembling a triangular steel frame and toughened glass, and a vibration absorption material is attached to the interior of the toughened glass.
Further, the tunnel model is formed by integrally pouring reinforced concrete into a lining structure and a ballast bed structure, the lining structure is subjected to circumferential joint cutting, and bolted connection contact of shield segments in actual engineering is simulated.
Further, the rigid cross beam penetrates through the tunnel model through the steel structure stand columns at the two ends, the vibration exciters are fixed on the rigid cross beam in an equidistant suspension mode, the upper ends of the vibration exciters are fixed with the rigid cross beam, and the lower ends of the vibration exciters are in contact with the top surface of the track bed structure of the tunnel model.
Furthermore, the sensor group comprises a displacement sensor, an acceleration sensor and a pressure sensor, the displacement sensor is embedded in soil at the bottom of the tunnel model, the acceleration sensor is embedded in soil covering the tunnel model and the earth surface, and the pressure sensor is fixed at the bottom of the vibration exciter.
Furthermore, the dynamic signal testing and analyzing system comprises a digital signal generator, a power amplifier, a dynamic signal acquisition instrument and a computer, wherein the dynamic signal acquisition instrument is respectively connected with the vibration exciter and the digital signal generator, and the digital signal generator is sequentially connected with the power amplifier and the computer.
The invention further provides a test method for simulating the operation vibration of the subway tunnel train, which comprises the following steps:
s1, simulating the operation vibration stratum environment of the subway tunnel train in the model box, and configuring soil bodies with different water contents;
s2, embedding the tunnel model in a soil body in a model box, setting a plurality of train load signals at equal time intervals through a computer, applying a plurality of train loads on a tunnel model track bed structure by a plurality of vibration exciters, synchronously transmitting monitoring signals to a dynamic signal acquisition instrument by a pressure sensor, and interactively displaying the load monitoring signals by a control computer;
and S3, when the deviation between the train load applied in the test and the test standard load is larger, adjusting the error by the computer, and repeating the step S2 until the error meets the requirement, namely completing the test load vibration test.
And arranging soil bodies with different water contents, covering the surface of the soil body in the model box by using a plastic film, standing for at least 24h, and embedding the tunnel model in the soil body.
The digital signal generator is controlled by a computer to generate a load vibration signal, the load vibration signal is synchronously transmitted to the power amplifier, the load vibration signal is amplified by the power amplifier and then transmitted to the vibration exciter, and the vibration signal is converted into a load to be applied to a track bed structure of the tunnel model.
Due to the adoption of the technical scheme, the invention has the following beneficial effects:
1) the invention adopts the scheme of loading multiple vibration exciters at equal intervals, overcomes the defect that the train vibration is simulated by single-point vibration excitation in the traditional model test, and can simulate the moving loading effect of the train more truly.
2) The device has the advantages of simple structure, simple and convenient operation, lower cost, easy realization, strong repeatability and the like, avoids the defects of high test cost and over-simplified problem caused by numerical analysis and analysis by singly adopting field test to a certain extent, can simulate the dynamic response of the tunnel structure and the peripheral stratum caused by train operation under different tunnel burial depths and different stratum water contents more truly, can form advantage complementation with the field test and numerical analysis method, and provides an effective and feasible test platform for researching the tunnel structure and the peripheral stratum vibration response caused by subway operation under different geological environments and engineering conditions.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention:
FIG. 1 is a schematic front view of a test apparatus according to the present invention;
FIG. 2 is a cross-sectional view (front) of the test device of the present invention;
FIG. 3 is a cross-sectional view (side view) of the test apparatus of the present invention;
fig. 4 is a sectional view of the tunnel model of the present invention.
Description of reference numerals: 1. a model box; 2. a rigid base; 3. a triangular steel frame; 4. tempering the glass plate; 5. a vibration absorbing material; 6. a soil body; 7. a tunnel model; 8. a vibration exciter; 9. a rigid cross beam; 10. a steel structure column; 11-1, a displacement sensor; 11-2, an acceleration sensor; 11-3, a pressure sensor; 11-4, strain gauges; 12. a digital signal generator; 13. a power amplifier; 14. a dynamic signal acquisition instrument; 15. a computer.
Detailed Description
The present invention will now be described in detail with reference to the drawings and specific embodiments, wherein the exemplary embodiments and descriptions of the present invention are provided to explain the present invention without limiting the invention thereto.
Referring to the attached drawing 1, the test device for simulating subway tunnel train operation vibration comprises a model box 1, a tunnel model 7, load loading equipment, a sensor group and a dynamic signal test analysis system, wherein soil is filled in the model box 1, the tunnel model 7 is embedded in soil layers in the model box, the load loading equipment is used for applying train excitation load, the sensor group is embedded in the soil layers in the model box and on the tunnel model, and the dynamic signal test analysis system is arranged outside the model box.
The model box 1 is formed by assembling a triangular steel frame 3 and toughened glass plates 4, wherein the toughened glass plates 4 can be used for clearly observing the settlement change of the tunnel and the surrounding soil layer from the outer side. Soil bodies 6 with corresponding characteristics are filled in the model box 1 according to test requirements, two circular ring windows are cut in the front and at the back of the model box 1 respectively and used for arranging a rigid cross beam 9 and placing a vibration exciter 8 in the tunnel model 7. The damping vibration absorption materials 5 are attached to the periphery of the model box 1 and inside the toughened glass plates 4, the damping vibration absorption materials can be Duxseal or foam plastic plates and the like, and the vibration absorption materials can better absorb compression waves and shear waves transmitted to the boundary of the model box and surface waves on the ground surface so as to simulate the absorption effect of a semi-infinite medium on the vibration waves, reduce the vibration wave reflection effect of the inner wall of the model box and improve the test precision and the accuracy of test results. The thickness of the vibration absorbing material is determined according to the requirement of test precision. The bottom of the model box is provided with a rigid base 2, and the rigid base 2 is formed by welding I-shaped steel so as to ensure the stability of the integral rigidity of the model box.
The tunnel model 7 is integrally cast by reinforced concrete, a lining structure and a ballast bed structure are formed in the casting process, the grade and the proportion of the reinforced concrete material are designed according to the similar ratio of the test, and the tunnel model is reduced in scale according to the prototype size of the shield tunnel in the actual engineering according to a certain proportion (the specific reduced scale size can be determined after the comprehensive consideration of the test conditions and the size of the test model box). The lining structure carries out the hoop joint-cutting to reduce its lining structure's bulk rigidity, wherein the lining structure pours the back of accomplishing, carries out the hoop joint-cutting according to the design and reduces model tunnel structure's bulk strength, the bolted connection contact of shield structure section of jurisdiction among the simulation actual engineering. The tunnel model is wholly embedded in the soil body in the model box.
As shown in fig. 3, the load loading device comprises an exciter 8(SA-JZ005) and a load-bearing support structure, wherein the exciter 8 is used for applying train vibration load to the tunnel model 7, and the main parameter performances of the exciter of the type are as follows: (1) maximum exciting force: 50N; (2) maximum amplitude: 7.5 mm; (3) maximum acceleration: 20g of the total weight of the mixture; (4) frequency range: DC-5 k; (5) force constant: 7.2N/A. The bearing support structure is composed of a rigid cross beam 9 and two steel structure upright columns 10, wherein the rigid cross beam 9 penetrates through the interior of the tunnel model 7, the rigid cross beam 9 supports the vibration exciter 8 in the interior of the tunnel model 7, the two steel structure upright columns 10 are respectively arranged on the front side and the rear side of the model box 1, the top ends of the two steel structure upright columns can be respectively fixed with the rigid cross beam 9 through high-strength bolts, so that the rigid cross beam 9 is guaranteed to have enough supporting force and rigidity stability, and meanwhile, the steel structure upright columns 10 can be subjected to height adjustment according to different burial depth positions of the tunnel model 7.
A plurality of vibration exciters 8 are suspended and fixed on a rigid cross beam 9 at equal intervals, the upper ends of the vibration exciters 8 are fixed with the rigid cross beam 9, the lower ends of the vibration exciters 8 are in contact with the top surface of a track bed structure of a tunnel model 7, train vibration loads are applied to the tunnel model 7, when the vibration exciters 8 are arranged, the moving loading characteristic of the train loads can be indirectly simulated, and the number of the required vibration exciters 8 is determined according to the size of a model box 1 and the size of the tunnel model 7.
The sensor group comprises a displacement sensor 11-1, an acceleration sensor 11-2 and a pressure sensor 11-3, and corresponding sensors are embedded in soil according to test requirements and test contents, wherein the displacement sensor 11-1 is embedded in the soil 6 at the bottom of the tunnel model 7 and used for monitoring displacement changes of a horizontal soil layer below the tunnel model 7; the acceleration sensor 11-2 is buried in the overlying soil body 6 and the earth surface of the tunnel model 7 and is used for monitoring the vibration acceleration response of the overlying soil body 6 or different positions of the earth surface of the tunnel model 7; the pressure sensor 11-3 is fixed at the bottom of the vibration exciter 8 and used for monitoring the exciting force applied by the vibration exciter to the tunnel lining structure in real time, and is connected with the dynamic signal testing and analyzing system, transmitting the pressure signal to the dynamic signal testing and analyzing system in real time, recording and displaying the monitoring signal of the pressure sensor 11-3 by the dynamic signal testing and analyzing system in real time, and checking whether the load and the frequency applied by the vibration exciter 8 are consistent with the test requirements or not, and synchronously adjusting according to the test requirements.
Further comprising strain gauges 11-4 arranged on the tunnel model 7 for monitoring the deformation of the lining structure.
The specific type of each sensor can be determined according to the test condition and the test precision under the condition of not interfering the normal implementation of the test device, and the invention does not make specific requirements. The arrangement or burying position of each sensor is shown in figures 1-3, figure 4 shows the arrangement direction and position of a pressure sensor 11-3 and a strain gauge 11-4, the strain gauge 11-4 is arranged on the two sides and the top of the inner wall of the tunnel model 7, and the pressure sensor 11-3 is fixed at the bottom of the vibration exciter 8. The overall arrangement direction and position of each sensor are only indicated in the figure, and the specific arrangement or embedding number is determined according to the test requirement and the test precision.
The dynamic signal testing and analyzing system consists of a digital signal generator 12(SA-SG030), a power amplifier 13(SA-PA020), a dynamic signal acquisition instrument 14(TST5910) and a control computer 15. The main performance parameters of the signal generator are as follows: (1) outputting a waveform: sine waves, square waves, triangular waves, white noise, linear frequency sweep, logarithmic frequency sweep and the like; (2) frequency range: 2-2 kHz; (3) and (3) signal output: 1Vrms +/-05 dB; (4) output power: 30W; the main performance parameters of the power amplifier are as follows: (1) output power: 192 VA; (2) output voltage: 16 Vrms; (3) input impedance: >10k Ω; the main performance parameters of the dynamic signal acquisition instrument are as follows: (1) sampling frequency: 256 kHz; (2) and (3) testing sensitivity: 0.01 mV/pc; (3) frequency response: 0.3-100 kHz; in the initial stage of the test, a digital signal generator 12 generates a load vibration signal under the control of a computer 15, the load vibration signal is synchronously transmitted to a power amplifier 13, then the load vibration signal is amplified by the power amplifier 13 and transmitted to a vibration exciter 8, finally the vibration exciter 8 converts the vibration signal into a load and applies the load to a track bed structure of a tunnel model 7, an equal-time interval vibration exciting load signal is output through a dynamic signal test analysis system, then train vibration exciting loads are applied by the vibration exciters 8 at the same time interval, and the moving loading characteristic of the train load in the actual engineering can be indirectly simulated.
The dynamic signal testing and analyzing system records and displays monitoring signals of the pressure sensor in real time and is used for checking whether the load and the frequency applied by the vibration exciter are consistent with the test requirements.
The moving loading effect of the train in the tunnel model is simulated through the equal time interval loading of each vibration exciter, and the dynamic signal testing and analyzing system obtains the dynamic response of a strain gauge monitoring tunnel model lining structure and a sensor group monitoring soil body under the action of the vibration load of the subway tunnel train, so that the influence of the tunnel burial depth and the water content of the soil body on the operation vibration of the subway tunnel train is obtained.
The test method of the test device for simulating the operation vibration of the subway tunnel train comprises the following steps:
1) before the test, soil is filled in the model box to configure the stratum environment required by the test, namely the soil with different water contents corresponds to the soil with different water contents, and the concrete water content configuration method comprises the following steps:
taking part of soil for the test to carry out an indoor soil test, and measuring the initial water content omega according to the formula (1)0And then calculating the required water adding amount of each layer of filling according to the formula (2).
ω0＝(m0/md-1)×100％ (1)
mw＝m0/(1+0.01ω0)×0.01(ω1-ω0) (2)
In the formula, m0M is the initial mass of each layer of filldFor the dry mass of each layer of fill, omega0Is the initial water content, omega, of the filled soil sample1Demarcating water content m for soil layerwThe water adding quality of each layer of filling soil is obtained.
The method comprises the steps of uniformly spraying water with required water quantity onto test soil 6 by using a sprinkling can, uniformly stirring, filling the test soil into a model box 1 layer by layer, compacting by using a compacting instrument every time when one layer is filled, covering the surface of the soil by using a film to prevent water from evaporating, covering and wetting the soil by using the film for 24 hours after the soil is filled (compacted) to a preset height, and repeating the steps to sequentially fill and compact the test soil 6 layer by layer from the bottom of the model box 1.
2) The model box 1 is filled with soil samples in three stages, the first stage is filling and compacting in layers to the bottom of a front (reverse) surface circular ring window of the model box 1, a self-made tunnel model 7 is placed after the filling of the first stage, and the front end surface and the rear end surface of the tunnel model 7 are aligned with the front circular ring opening and the rear circular ring opening of the model box 1. And then, continuously filling the soil 6 until the soil 6 completely covers the arch top of the model tunnel type 7, which is a second stage. And in the third stage, soil 6 is continuously filled from the arch top of the tunnel model 7 to the preset height of the model box 1, and the preset height is determined according to the tunnel burial depth condition required by the test.
3) And after the second step is finished, basically configuring the stratum environment of the model box 1, covering the surface of the soil body 6 in the model box 1 by using a plastic film and standing for 24 hours on the basis, so that the moisture in the soil body 6 is reduced, and the moisture in the soil body 6 can be fully diffused among soil particles in the model box 1 at the same time, thereby achieving the uniformity of the moisture content of the tested soil body 6.
4) Before the test, the computer 15 controls the digital signal generator 12 to generate a test load signal, the test load signal is amplified by the power amplifier 13 and then transmitted to the vibration exciter 8, and finally the vibration exciter 8 applies the load on the track bed structure of the tunnel model 7.
5) The load applied by the vibration exciter 8 to the tunnel model 7 is monitored by a pressure sensor 113 at the bottom of the vibration exciter 8, a monitoring signal is synchronously transmitted to the dynamic signal acquisition instrument 14, the load monitoring signal is interactively displayed by the computer 15, when the deviation between the load applied by the test and the load required by the test is large, the error is adjusted by the computer 15, and then the operation of the 4 th step is repeated until the error is small enough and can be ignored, so that the checking work of the test load is completed.
6) The computer 15 controls the digital signal generator 12 to generate a test train load signal, the vibration signal is amplified by the power amplifier 13, the vibration exciter 8 applies the train load to the track bed structure of the tunnel model 7, it should be noted that when the train load is applied at this stage, the computer 15 needs to set a plurality of train load signals with equal time intervals, and after the operation, the vibration exciters 8 in the tunnel model 7 also apply a plurality of train loads to the track bed structure synchronously, so that the application of the moving train load is indirectly simulated.
7) In the test process, dynamic response of the lining structure of the tunnel model 7 and the soil body 6 is monitored by each sensor, test signals are collected and analyzed by the dynamic signal collector 14, different load working conditions can be set in the test process, multi-parameter analysis is carried out, and the final test purpose is achieved.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (10)
1. A test device for simulating subway tunnel train operation vibration is characterized by comprising a model box, a tunnel model, load loading equipment, a sensor group and a dynamic signal test analysis system;
the model box is filled with soil, the tunnel model is embedded in the soil inside the model box, and load loading equipment is arranged in the tunnel model and comprises a rigid cross beam and a plurality of vibration exciters positioned below the rigid cross beam; the tunnel model is internally provided with strain gauges, a soil body is internally provided with a sensor group, the dynamic signal testing and analyzing system is connected with the sensor group, and the strain gauges and the sensor group are connected with the dynamic signal testing and analyzing system;
the moving loading effect of the train in the tunnel model is simulated through the equal time interval loading of each vibration exciter, and the dynamic signal testing and analyzing system obtains the dynamic response of a strain gauge monitoring tunnel model lining structure and a sensor group monitoring soil body under the action of the vibration load of the subway tunnel train, so that the influence of the tunnel burial depth and the water content of the soil body on the operation vibration of the subway tunnel train is obtained.
2. The test device for simulating the operation vibration of the subway tunnel train as claimed in claim 1, wherein said model box is assembled by a triangular steel frame and a toughened glass, and a vibration absorbing material is attached to the interior of the toughened glass.
3. The test device for simulating the operation vibration of the subway tunnel train as claimed in claim 1, wherein said tunnel model is formed by integrally casting reinforced concrete to form a lining structure and a ballast bed structure, and the lining structure is circumferentially slit to simulate the bolted contact of shield segments in actual engineering.
4. A test device for simulating subway tunnel train operation vibration according to claim 1, wherein said rigid cross beam is supported by steel structure columns at both ends and penetrates through the tunnel model, a plurality of vibration exciters are suspended and fixed on the rigid cross beam at equal intervals, the upper ends of the vibration exciters are fixed with the rigid cross beam, and the lower ends of the vibration exciters are in contact with the top surface of the track bed structure of the tunnel model.
5. The test device for simulating the operation vibration of the subway tunnel train as claimed in claim 1, wherein said sensor group comprises a displacement sensor, an acceleration sensor and a pressure sensor, the displacement sensor is embedded in the soil mass at the bottom of the tunnel model, the acceleration sensor is embedded in the soil mass on the tunnel model and the earth surface, and the pressure sensor is fixed at the bottom of the vibration exciter.
6. The test device for simulating the operation vibration of the subway tunnel train as claimed in claim 1, wherein said dynamic signal test analysis system comprises a digital signal generator, a power amplifier, a dynamic signal collector and a computer, the dynamic signal collector is respectively connected with the vibration exciter and the digital signal generator, and the digital signal generator is sequentially connected with the power amplifier and the computer.
7. A test method for simulating subway tunnel train operation vibration based on the device of any one of claims 1-6 is characterized by comprising the following steps:
s1, simulating the operation vibration stratum environment of the subway tunnel train in the model box, and configuring soil bodies with different water contents;
s2, embedding the tunnel model in a soil body in a model box, setting a plurality of train load signals at equal time intervals through a computer, applying a plurality of train loads on a tunnel model track bed structure by a plurality of vibration exciters, synchronously transmitting monitoring signals to a dynamic signal acquisition instrument by a pressure sensor, and interactively displaying the load monitoring signals by a control computer;
and S3, when the deviation between the train load applied in the test and the test standard load is larger, adjusting the error by the computer, and repeating the step S2 until the error meets the requirement, namely completing the test load vibration test.
8. The test method for simulating the operation vibration of the subway tunnel train as claimed in claim 7, wherein the water content of the soil body is obtained by calculating the required water addition amount of each layer of filling soil:
ω0＝(m0/md-1)×100％ (1)
mw＝m0/(1+0.01ω0)×0.01(ω1-ω0) (2)
in the formula, m0M is the initial mass of each layer of filldFor the dry mass of each layer of fill, omega0Is the initial water content, omega, of the filled soil sample1Demarcating water content m for soil layerwThe water adding quality of each layer of filling soil is obtained.
9. A test method for simulating operation vibration of a subway tunnel train as claimed in claim 7, wherein soil bodies with different water contents are prepared, a plastic film is used to cover the surface of the soil body in the model box and is left standing for at least 24h, and then the tunnel model is buried in the soil body.
10. A test method for simulating operation vibration of a subway tunnel train as claimed in claim 7, wherein said digital signal generator is controlled by computer to generate load vibration signal, and synchronously transmit it to power amplifier, and said power amplifier amplifies the load vibration signal and transmits it to vibration exciter, and converts it into load to apply it to track bed structure of tunnel model.
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