CN115711706B - Tunnel joint sealing gasket waterproof capacity early warning system and judgment method - Google Patents
Tunnel joint sealing gasket waterproof capacity early warning system and judgment method Download PDFInfo
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- CN115711706B CN115711706B CN202310028882.1A CN202310028882A CN115711706B CN 115711706 B CN115711706 B CN 115711706B CN 202310028882 A CN202310028882 A CN 202310028882A CN 115711706 B CN115711706 B CN 115711706B
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Abstract
The invention discloses a tunnel joint sealing gasket waterproof capability early warning system and a judging method. The judging method of the invention utilizes a laser ranging sensor to obtain the real-time deformation condition between the pipe piece joints, utilizes an optical fiber pressure sensor to obtain the real-time contact stress between the joint sealing gaskets, and the two jointly form a joint sealing gasket contact state real-time data set; acquiring early warning values of the waterproof capacity of the sealing gasket in different contact states through an indoor sealing gasket waterproof test; the method and the device can realize dynamic judgment of the leakage risk of the segment joint sealing gasket according to the change of the segment joint contact state of the shield tunnel, and are simple to operate and convenient to use on site.
Description
Technical Field
The invention relates to the field of shield waterproof, in particular to a tunnel joint sealing gasket waterproof capacity early warning system and a judging method.
Background
Along with the wide application of the shield tunnel, the water leakage problem caused by the discontinuous joint structure of the shield tunnel is more prominent, and particularly the water leakage problem caused by the annular joint between two annular pipe pieces accounts for more than 50 percent. Once water leakage occurs at the seams of the tunnel segments, the safety of the tunnel structure can be influenced, and the electrified auxiliary facilities in the tunnel can be damaged, so that the normal service life of the shield tunnel is seriously influenced.
The existing shield tunnel segment seam waterproof capability monitoring system and method only compare and judge leakage risks through a single monitoring sealing gasket contact stress value and leakage pressure obtained through numerical simulation, the method completely neglects the influence of seam deformation on the sealing gasket contact stress, and the proposed judgment standard value cannot correspond to the actual working condition of the engineering, so that the use of the judgment standard without referential property brings great deviation to the actual judgment result of the engineering. In addition, if the waterproof capability of the joint is estimated according to the segment joint deformation value, the calculation is too complex, and the estimated waterproof capability value is used for leakage water early warning, so that the early warning result has large deviation, and great difficulty is brought to practical engineering application. Therefore, the current monitoring aiming at the waterproof capability of the duct piece joint sealing gasket focuses on the real-time contact state of the joint sealing gasket, namely the real-time contact stress between the sealing gaskets in different joint deformation states, and the real-time contact stress is compared with the alarm value obtained by the test to judge whether the waterproof capability of the joint sealing gasket is insufficient or not, so that the simple and visual judgment method is more beneficial to the actual operation and use of an engineering field.
In summary, there is a need for a sealing gasket waterproof capability early warning system and a sealing gasket waterproof capability early warning method, which can identify the real-time contact state change of the segment joint and dynamically judge the leakage risk of the sealing gasket of the joint, so as to solve the above problems.
Disclosure of Invention
The invention aims to provide a tunnel seam sealing gasket waterproof capacity early warning system and a judging method, which aim to solve the problem of accurately early warning and judging the seam waterproof capacity in the prior art, and the specific technical scheme is as follows:
a waterproof capability early warning system of a tunnel joint sealing gasket comprises a deformation monitoring module and a contact stress monitoring module;
the deformation monitoring module comprises a laser ranging sensor, a characteristic reflection point and a first data acquisition assembly; the laser ranging sensors and the characteristic reflection points are respectively arranged on two adjacent groups of duct pieces, and the laser ranging sensors and the characteristic reflection points are arranged in one-to-one correspondence in the axial direction of the duct pieces; the laser ranging sensor is used for respectively measuring the distance to the end face of the segment and the distance to the characteristic reflection point; the first data acquisition assembly is connected with the laser ranging sensor;
the contact stress monitoring module comprises a pressure sensor and a second data acquisition component; the pressure sensor is arranged between the two adjacent groups of seam sealing gaskets, and the second data acquisition assembly is connected with the pressure sensor.
Preferably, in the above technical scheme, the deformation monitoring module includes two groups of laser ranging sensors and two groups of characteristic reflection points; the pipe sheet is provided with a groove for mounting a joint sealing gasket; along the radial direction of the duct piece, two groups of laser ranging sensors are respectively arranged on two sides of the groove, and two groups of characteristic reflection points are respectively arranged in one-to-one correspondence with the two groups of laser ranging sensors.
The contact stress monitoring module preferably in the above technical scheme comprises a plurality of groups of pressure sensors; the multiple groups of pressure sensors are arranged between the contact surfaces of the two adjacent groups of joint sealing gaskets and are used for measuring the contact stress between the contact surfaces of the two groups of joint sealing gaskets.
Preferably, in the above technical solution, the first data acquisition component includes a photoelectric demodulator and a first data acquisition unit; the photoelectric demodulator is connected with the laser ranging sensor; the first data acquisition unit is connected with the photoelectric demodulator;
the second data acquisition component comprises an optical fiber demodulator and a second data acquisition unit; the optical fiber demodulator is connected with the pressure sensor; and the second data collector is connected with the optical fiber demodulator.
A method for judging the waterproof capacity of a tunnel joint sealing gasket is adopted, and the early warning system for the waterproof capacity of the tunnel joint sealing gasket comprises the following steps:
step S1: collecting the vertical distance to the end face of the duct piece and the linear distance to the characteristic reflection point measured by the laser ranging sensor, wherein
The vertical distance measured by the group laser ranging sensor to the end surface of the duct piece is defined as ^ 5>
And is/are>
The linear distance measured by the group laser ranging sensor to the characteristic reflection point is defined as->
；
Step S2: identifying a deformation mode of the joint sealing gasket according to the magnitude relation between the vertical distance and the linear distance in the step S1, and calculating the deformation amount generated in the deformation mode;
and step S3: corresponding the contact stress value measured by the pressure sensor with the deformation in the step S2, and forming a contact state real-time monitoring data set
；
And step S4: acquiring preset warning value of waterproof capability of joint sealing gasket in different contact states
；
Step S5: monitoring data set in step S3
And the preset guard value in step S4>
And comparing, and if the size requirement is met, judging that the joint gasket at the measured position has the risk of water leakage.
Preferably, in the step S2, the deformation mode of the joint sealing gasket includes opening deformation, staggered deformation and corner deformation;
the steps of identifying the deformation mode are as follows:
step S2.1: comparison of
And/or>
Is equal or not, if>
The deformation mode of the joint sealing gasket is identified as open deformation, if->
If yes, entering step S2.2;
step S2.2: comparison
And &>
Is equal or not, if>
The deformation mode of the joint sealing gasket is identified as wrong deformation, and if ^ is greater than or equal to>
And identifying the deformation mode of the joint sealing gasket as corner deformation.
Preferably, in the above technical solution, in the step S2, the deformation amount is calculated as follows:
when the identified deformation mode is opening deformation, the opening deformationMeasurement of
Is calculated as shown in equation 1):
wherein the content of the first and second substances,
represents a fifth or fifth party>
The vertical distance from the laser ranging sensor to the end face of the duct piece is measured; />
Indicates the fifth->
The vertical distance from the laser ranging sensor to the end face of the duct piece is measured;
when the identified deformation mode is dislocation deformation, dislocation deformation amount
Is calculated as shown in equation 2):
wherein the content of the first and second substances,
represents a fifth or fifth party>
The linear distance to the characteristic reflection point measured by the group laser ranging sensor;
when the identified deformation mode is corner deformation, the deformation amount of the corner is changed
Is calculated as shown in equation 3): />
Wherein the content of the first and second substances,
representing the distance between two adjacent laser ranging sensors in the radial direction of the duct piece; />
、/>
And->
Are all calculated process parameters.
Preferably, in the step S3, the contact state real-time monitoring data set
As shown in equation 4):
wherein the content of the first and second substances,
are the contact stress values at different locations on the contact surface of the joint gasket.
Preferably, in the step S4, a warning value is preset
As shown in equation 5):
wherein the content of the first and second substances,
presetting warning values for the waterproof performance of the joint sealing gaskets in different joint deformation modes;
obtaining
As shown in equation 5.1):
wherein the content of the first and second substances,
compressive contact stress for the joint seal; />
Represents->
And/or>
The relation coefficient of (1); />
Represents the poisson's ratio of the material; />
Indicating the side water pressure.
Preferably, in the step S5, the monitoring data set is collected
And the preset warning value in the step S4
For comparison, as shown in equation 6):
if monitoring the data set
And if the formula 6) is satisfied, judging that the joint of the detected position has the risk of water leakage, otherwise, judging that the risk of water leakage does not exist.
The technical scheme of the invention has the following beneficial effects:
(1) The early warning system for the waterproof capacity of the tunnel joint sealing gasket comprises a deformation monitoring module and a contact stress monitoring module, wherein a laser distance measuring sensor is arranged between the end surfaces of two groups of pipe pieces, and a pressure sensor is arranged between the joint sealing gaskets, so that the contact state of the pipe piece joints can be monitored in real time in all weather, and the problems of difficulty in monitoring the joint of an operation tunnel and low monitoring efficiency are solved.
(2) According to the invention, by means of monitoring the deformation condition of the joint and the contact stress of the sealing gasket, the influence of the deformation of the joint on the contact stress of the sealing gasket can be fully considered, the applicability of the monitoring data under all working conditions is improved on the basis of a mechanical principle, and a series of problems of limited application range and poor accuracy caused by single and rough monitoring data of the existing monitoring means are solved.
(3) According to the method for judging the waterproof capacity of the tunnel joint sealing gasket, the simulation working condition of an indoor test can be further defined by accurately matching the contact stress in the real-time monitoring data with the joint deformation mode, so that the preset warning value matched with the monitoring data is obtained in a targeted manner, the timeliness and the accuracy of the joint water leakage early warning result are effectively improved, and the method for judging the waterproof capacity of the joint is simple in principle, clear in calculation method, easy to operate and convenient to use on site.
(4) The judging method of the invention utilizes a laser ranging sensor to obtain the real-time deformation condition between the pipe piece joints, utilizes an optical fiber pressure sensor to obtain the real-time contact stress between the joint sealing gaskets, and the two jointly form a joint sealing gasket contact state real-time data set; acquiring early warning values of the waterproof capacity of the sealing gasket in different contact states through an indoor sealing gasket waterproof test; and judging whether the real-time data set of the contact state of the joint sealing gasket exceeds an early warning value or not, if so, judging that the position joint to be detected has the risk of water leakage, namely, the method can realize dynamic judgment of the leakage risk of the pipe piece joint sealing gasket according to the change of the contact state of the shield tunnel pipe piece joint, and is simple to operate and convenient to use on site.
The present invention has other objects, features and advantages in addition to those described above. The present invention will be described in further detail below with reference to the drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
In the drawings:
fig. 1 is a schematic view of a waterproof capability early warning system of a tunnel joint gasket in the present embodiment;
FIG. 2 is a schematic diagram showing the distribution of the pressure sensors on the contact surface in the present embodiment;
FIG. 3 is a schematic flow chart illustrating a method for determining waterproof capability of a tunnel joint gasket according to the present embodiment;
fig. 4 is a schematic diagram of a distance measurement principle under different deformation models in the present embodiment, in which (a) represents an opening deformation, (B) represents a slab staggering deformation, and (C) represents a corner deformation;
FIG. 5 is a graph showing the water pressure-contact stress at the side of the test of the waterproof ability of the gasket in the deformation mode of the opened joint in this embodiment;
wherein, 1, a laser ranging sensor; 2. characteristic reflection points; 3. a first data acquisition component; 3.1, a photoelectric demodulator; 3.2, a first data acquisition unit; 4. a pressure sensor; 5. a second data acquisition component; 5.1, an optical fiber demodulator; 5.2, a second data collector; 6. a duct piece; 7. a joint gasket; 7.1, the contact surface of the joint gasket.
Detailed Description
Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways, which are defined and covered by the claims.
Example (b):
the embodiment discloses a waterproof capability early warning system and a judgment method for a tunnel joint sealing gasket, as shown in fig. 1 to 5, the waterproof capability early warning system of the tunnel joint sealing gasket in the embodiment is described first, and specifically as follows:
the early warning system for the waterproof capacity of the tunnel joint sealing gasket comprises a deformation monitoring module and a contact stress monitoring module;
the deformation monitoring module is specifically as follows, as shown in fig. 1 to 2:
the deformation monitoring module comprises laser ranging sensors 1, characteristic reflection points 2 and a first data acquisition assembly 3, the number of the laser ranging sensors 1 in the embodiment can be multiple groups (the number of the laser ranging sensors is preferably two groups in the embodiment), the characteristic reflection points 2 and the laser ranging sensors 1 are arranged in one-to-one axial correspondence, namely, the embodiment comprises two groups of the characteristic reflection points 2, and the characteristic reflection points 2 can reflect laser emitted by the laser ranging sensors 1, so that the ranging operation can be realized; the first data acquisition assembly 3 is used for acquiring the distance measurement data of the laser distance measurement sensor 1.
Wherein, the laser ranging sensor 1 can vertically and upwardly shoot the ranging laser to measure the vertical distance from the ranging laser to the end surface of the duct piece 6 (i.e. the end surface of the other group of duct pieces), wherein
The vertical distance measured by the group laser ranging sensor to the end surface of the duct piece is defined as ^ 5>
E.g. in conjunction with>
Indicates the fifth->
And (3) grouping the vertical distance to the end face of the duct piece measured by the laser ranging sensor. Moreover, the laser ranging sensor 1 can emit ranging laser toward the corresponding characteristic reflection point 2 to measure the linear distance from the characteristic reflection point 2, wherein the ^ h or greater>
The linear distance measured by the group laser ranging sensor to the characteristic reflection point 2 is defined as ≥ r>
E.g. based on>
Indicates the fifth->
The group laser range sensor measures the straight-line distance to the characteristic reflection point 2. It should be noted that 1) since two sets of laser ranging sensors 1 are preferable in the present embodiment, the present invention is based on the fact that>
(ii) a 2) When the early warning system is just installed, the initial gap existing in the assembling of the shield tunnel segment is equal to the vertical distance from the laser ranging sensor to the end face of the segment and the linear distance from the laser ranging sensor to the characteristic reflection point 2.
The first data acquisition component 3 comprises a photoelectric demodulator 3.1 and a first data acquisition unit 3.2; the photoelectric demodulator 3.1 is connected with the laser ranging sensor 1; the first data collector 3.2 is connected with the photoelectric demodulator 3.1; the photoelectric demodulator 3.1 is used for converting optical signals input by the laser ranging sensor 1 into electric signals to be output, and the first data acquisition device 3.2 is used for receiving and storing the electric signals output by the photoelectric sensor in real time.
The contact stress monitoring module is specifically as follows, as shown in fig. 1 to 2:
the contact stress monitoring module comprises a pressure sensor 4 and a second data acquisition component 5; in the embodiment, the pressure sensor 4 is arranged between two adjacent groups of joint gaskets 7, and the two groups of joint gaskets 7 are respectively arranged in the grooves of the two groups of pipe pieces 6; the second data acquisition component 5 is used for acquiring the contact stress value between the contact surfaces 7.1 of the two groups of joint sealing gaskets measured by the pressure sensor 4.
There are several groups of pressure sensors 4 (i.e. optical fiber pressure distribution sensors), and the groups of pressure sensors 4 are uniformly distributed between the contact surfaces 7.1 of the two groups of seam gaskets, see fig. 1, where the two groups of contact surfaces refer to the lower end surface of the upper group of seam gaskets 7 and the upper end surface of the lower group of seam gaskets 7. The optical fiber pressure sensor 4 is in a plane sheet shape, and is uniformly distributed on the contact surface 7.1 of the joint sealing gasket, and the joint sealing gasket 7 is considered to be likely to have large dislocation deformation, the optical fiber pressure sensor 4 completely covers the contact surface of the joint sealing gasket 7, so that the optical fiber pressure sensor 4 still can normally work under the condition that the joint is greatly deformed, and the contact stress magnitude between the contact surfaces of the joint sealing gasket 7 can be accurately tested by utilizing the characteristic that the backward Rayleigh scattering signal of the optical fiber pressure sensor 4 can be changed after the optical fiber pressure sensor is pressed. Further, the distribution of the pressure sensors 4 is as shown in fig. 2, fig. 2 is a schematic top view, and in fig. 2, the groups of pressure sensors 4 are uniformly distributed between the contact surfaces 7.1 of the two groups of seam gaskets along the horizontal radial direction and the horizontal circumferential direction.
The second data acquisition component 5 comprises an optical fiber demodulator 5.1 and a second data acquisition unit 5.2; the optical fiber demodulator 5.1 is connected with the pressure sensor 4; the second data collector 5.2 is connected with the fiber demodulator 5.1. The optical fiber demodulator 5.1 is used for converting an optical fiber signal input by the optical fiber pressure sensor 4 into an electric signal and outputting the electric signal; the second data collector 5.2 is used for receiving and storing the electric signals output by the optical fiber sensor in real time.
The embodiment discloses a method for judging waterproof capability of a tunnel joint sealing gasket, which adopts a tunnel joint sealing gasket waterproof capability early warning system, and the basic principle of the judging method of the embodiment is as follows: based on the contact state identification, the data of the laser ranging sensor 1 can identify the deformation of the joint, and the contact stress data in the corresponding deformation mode can form a contact state real-time monitoring data set, so that the joint sealing gasket waterproof indoor test is designed to obtain the preset warning value of the waterproof capacity of the joint sealing gasket in different contact states, and the contact state real-time monitoring data set is judged and early warned.
The method for judging the waterproof capability of the tunnel joint gasket in the embodiment includes the following steps S1 to S5, as shown in fig. 3 to 5, specifically as follows:
step S1: data measured by the laser ranging sensor 1 are collected, as shown in fig. 4, specifically:
Wherein, the first and the second end of the pipe are connected with each other,
indicates the fifth->
The vertical distance from the laser ranging sensor to the end face of the duct piece is measured; />
Indicates the fifth->
The vertical distance from the laser ranging sensor to the end face of the duct piece is measured; />
Indicates the fifth->
The linear distance to the characteristic reflection point 2 measured by the group of laser ranging sensors; />
Indicates the fifth->
The linear distance to the characteristic reflection point 2 measured by the group laser ranging sensor;
step S2: identifying a deformation mode of the joint gasket 7 according to the magnitude relation between the vertical distance and the linear distance in the step S1, and calculating the deformation amount generated in the deformation mode;
it should be noted that the deformation modes of the joint gasket 7 in this embodiment include opening deformation, staggered deformation, and corner deformation;
the deformation mode identification process is as follows:
step S2.1: comparison
And/or>
Is equal or not, if>
The deformation mode of the joint sealing gasket 7 is recognized as open deformation, if->
Then the process proceeds to step S2.2,
wherein, the first and the second end of the pipe are connected with each other,
when in use
When the cover is opened (opened and deformed), the amount of opening and deformation is greater than or equal to>
Is calculated as shown in equation 1):
step S2.2: comparison
And &>
Is equal or not, if>
The deformation mode of the joint seal 7 is recognized as a staggered deformation if ^ er>
Then, the deformation mode of the joint sealing gasket 7 is identified as corner deformation;
wherein the content of the first and second substances,
when in use
In time (staggered distortion), as shown in (B) of FIG. 4, the staggered distortion amount +>
Is calculated as shown in equation 2): />
When the temperature is higher than the set temperature
When the rotation angle is changed, as shown in (C) of FIG. 4, the amount of the change of the rotation angle is greater than or equal to>
(i.e., the seam corner) is calculated as shown in equation 3):
wherein the content of the first and second substances,
the distance between two adjacent laser ranging sensors in the radial direction of the pipe piece (namely the width of the groove) is represented;
、/>
and->
Are all calculated process parameters.
And step S3: the contact stress value measured by the pressure sensor 4 and the stepsThe deformation obtained in S2 corresponds to each other, and the contact stress value and the deformation form a contact state real-time monitoring data set
Further, it is: acquiring contact stress values at different positions on the contact surface of the sealing gasket through the optical fiber pressure sensor 4 arranged on the contact surface 7.1 of the sealing gasket, wherein the contact stress values correspond to the identified seam deformation modes one to form a contact state real-time monitoring data set ^ and ^ according to the contact state>
，/>
As shown in the following formula 4):
wherein the content of the first and second substances,
are contact stress values at different locations on the contact surface of the joint gasket 7, here->
The value of (d) depends on the acquisition resolution of the fiber optic pressure sensor 4;
and step S4: acquiring preset warning value of waterproof capability of joint sealing gasket 7 in different contact states
Preset warning value
As shown in the following formulas 5.1) and 5),
wherein, the first and the second end of the pipe are connected with each other,
compressive contact stress for the joint seal 7; />
Represents->
And/or>
The relation coefficient of (1); />
Represents the poisson's ratio of the material; />
Represents the side water pressure;
wherein the content of the first and second substances,
presetting warning values for waterproofing of the joint sealing gaskets 7 in different joint deformation modes;
the principles of the above formulas 5.1) and 5) are explained as follows:
there is a certain correspondence between the waterproof performance and the mechanical properties of the joint gasket 7, which can be expressed as formula 5.11):
wherein, the first and the second end of the pipe are connected with each other,
mainly influenced by two aspects of lateral water pressure and material mechanical properties, and can be represented as formula 5.12):
the test data of the waterproof capability and the side water pressure of the joint sealing gasket 7 under different joint deformation working conditions can be obtained through the waterproof test of the indoor joint sealing gasket 7, as shown in figure 5, the side water pressure-contact stress curve of the waterproof capability test of the sealing gasket under the joint opening deformation mode is given in figure 5, and on the basis of the curve, the relation coefficient can be obtained through nonlinear fitting
So as to calculate the preset warning value R of the waterproof capability of the joint gasket 7 under different contact conditions, and thus, formula 5):
step S5: monitoring data set in step S3
And the preset guard value in step S4>
Comparing, if the size requirement is met, judging that the seam sealing gasket 7 at the detected position has water leakage risk, otherwise, if the size requirement is not met, not having water leakage risk, and comparing the size as shown in formula 6):
if monitoring the data set
And when the relation of the magnitude of the formula 6) is satisfied, namely the monitoring contact stress is larger than a preset warning value, judging that the joint of the detected position has the water leakage risk, and otherwise, judging that the water leakage risk does not exist.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A method for judging the waterproof capability of a tunnel joint sealing gasket adopts a tunnel joint sealing gasket waterproof capability early warning system, and is characterized in that the tunnel joint sealing gasket waterproof capability early warning system comprises a deformation monitoring module and a contact stress monitoring module;
the deformation monitoring module comprises a laser ranging sensor (1), a characteristic reflection point (2) and a first data acquisition assembly (3);
the laser ranging sensors (1) and the characteristic reflection points (2) are respectively arranged on two adjacent groups of pipe pieces (6), and the laser ranging sensors (1) and the characteristic reflection points (2) are arranged in one-to-one correspondence in the axial direction of the pipe pieces (6); the laser ranging sensor (1) is used for respectively measuring the distance to the end face of the duct piece and the distance to the characteristic reflection point (2); the first data acquisition assembly (3) is connected with the laser ranging sensor (1);
the contact stress monitoring module comprises a pressure sensor (4) and a second data acquisition component (5); the pressure sensors (4) are arranged between two adjacent groups of seam sealing gaskets (7), and the second data acquisition assembly (5) is connected with the pressure sensors (4);
the method for judging the waterproof capacity of the tunnel joint sealing gasket comprises the following steps:
step S1: acquiring a vertical distance to the end face of the duct piece and a linear distance to the characteristic reflection point (2) which are measured by a laser ranging sensor (1), wherein the vertical distance to the end face of the duct piece measured by an ith group of laser ranging sensors is defined as ai, and the linear distance to the characteristic reflection point measured by the ith group of laser ranging sensors is defined as bi;
step S2: identifying a deformation mode of the joint sealing gasket (7) according to the magnitude relation between the vertical distance and the linear distance in the step S1, and calculating the deformation amount generated in the deformation mode;
and step S3: corresponding the contact stress value measured by the pressure sensor (4) to the deformation in the step S2, and forming a contact state real-time monitoring data set M;
and step S4: acquiring preset warning values R of the waterproof capacity of the joint sealing gasket (7) in different contact states;
step S5: comparing the monitoring data set M in the step S3 with the preset warning value R in the step S4, and if the monitoring data set M meets the size requirement, judging that the joint sealing gasket (7) at the detected position has water leakage risk;
in the step S2, the deformation modes of the joint sealing gasket (7) comprise opening deformation, staggered platform deformation and corner deformation;
the steps of identifying the deformation mode are as follows:
step S2.1: comparing whether a1 is equal to b1, if a1= b1, identifying that the deformation mode of the joint gasket (7) is stretching deformation, and if a1 ≠ b1, entering step S2.2;
step S2.2: comparing whether a1 and a2 are equal or not, if a1= a2, identifying that the deformation mode of the joint gasket (7) is staggered deformation, and if a1 ≠ a2, identifying that the deformation mode of the joint gasket (7) is corner deformation;
wherein a1 represents the vertical distance to the end face of the duct piece measured by the 1 st group of laser ranging sensors; a2 represents the vertical distance from the second group of laser ranging sensors to the end face of the duct piece; b1 represents the straight-line distance to the characteristic reflection point (2) measured by the 1 st group of laser ranging sensors; b2 represents the straight-line distance to the characteristic reflection point (2) measured by the 2 nd group of laser ranging sensors;
in step S2, the deformation amount is calculated as follows:
when the identified deformation mode is opening deformation, the opening deformation amount Δ p is calculated as shown in formula 1):
Δp＝a1＝a2 1)；
when the identified deformation mode is dislocation deformation, calculating the dislocation deformation S according to the formula 2):
when the identified deformation mode is corner deformation, the calculation of the corner deformation amount θ is as shown in equation 3):
wherein L represents the distance between two adjacent laser ranging sensors in the radial direction of the duct piece; s1, theta 1 and theta 2 are all calculation process parameters.
2. The method for judging the waterproof capacity of the tunnel seam sealing gasket according to claim 1, wherein the deformation monitoring module comprises two groups of laser ranging sensors (1) and two groups of characteristic reflection points (2);
the duct piece (6) is provided with a groove for installing a joint sealing gasket (7); along section of jurisdiction (6) radially, two sets of laser rangefinder sensors (1) set up respectively in the both sides of slot, and two sets of characteristic reflection point (2) set up with two sets of laser rangefinder sensors (1) one-to-one respectively.
3. The method for judging the waterproof capability of the tunnel seam gasket according to claim 1, wherein the contact stress monitoring module comprises a plurality of groups of pressure sensors (4); the multiple groups of pressure sensors (4) are arranged between the contact surfaces (7.1) of the two adjacent groups of joint sealing gaskets and are used for measuring the contact stress between the contact surfaces of the two groups of joint sealing gaskets (7).
4. The method for judging waterproof capability of a tunnel joint gasket according to claim 1,
the first data acquisition assembly (3) comprises a photoelectric demodulator (3.1) and a first data acquisition unit (3.2); the photoelectric demodulator (3.1) is connected with the laser ranging sensor (1); the first data acquisition unit (3.2) is connected with the photoelectric demodulator (3.1);
the second data acquisition component (5) comprises an optical fiber demodulator (5.1) and a second data acquisition unit (5.2); the optical fiber demodulator (5.1) is connected with the pressure sensor (4); the second data collector (5.2) is connected with the optical fiber demodulator (5.1).
5. The method for judging the waterproof capability of the tunnel seam sealing gasket according to claim 1, wherein in the step S3, the contact state real-time monitoring data set M is represented by formula 4):
m = { Δ p or S or θ | p 1 ，p 2 ，p 3 ，…，p i } 4)；
Wherein p is i Are the contact stress values at different locations on the contact surface of the joint gasket.
6. The method for judging the waterproof capability of the tunnel joint gasket according to claim 1 or 5, wherein in the step S4, the preset warning value R is represented by formula 5):
r = { Δ P or S or θ | P f } 5)；
Wherein, P f Presetting warning values for the waterproof performance of the joint sealing gaskets in different joint deformation modes;
obtaining P f As shown in equation 5.1):
wherein P is the compressive contact stress of the joint gasket; ω represents P f Coefficient of relation to P; v represents the Poisson's ratio of the material; p t Indicating the side water pressure.
7. The method for determining waterproof capability of a tunnel seam gasket according to claim 6, wherein in the step S5, the monitoring data set M is compared with the preset warning value R in the step S4, as shown in formula 6):
P n >P f 6)；
P n the real-time monitoring value of the contact stress of the joint sealing gasket is shown, wherein n =1,2,3, \8230k, k is the maximum acquisition density number of the pressure sensor;
if the monitoring data set M satisfies formula 6), it is determined that there is a risk of water leakage at the seam of the detected position, otherwise, there is no risk of water leakage.
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