KR20090106257A - The method to estimate realtime-quantitative stability of the tunnel under construction and it's system - Google Patents

Abstract

PURPOSE: A method and an apparatus for estimating realtime-quantitative stability of a tunnel under construction are provided to carry out quick and quantitative determination of tunnel's stability during excavation. CONSTITUTION: A method for estimating realtime-quantitative stability of a tunnel under construction comprises a field measurement step(100), a strain computation step(200), and a tunnel stability evaluation step(300). In the field measurement step, displacement information on an excavation ground is measured using measuring instruments which are installed inside and around the tunnel being excavated. In the strain computation step, a deformation rate of the tunnel is calculated using the measured displacement information. In the tunnel stability evaluation step, the calculated deformation rate of the tunnel is drawn on a limit strain boundary graph in real time and the stability and cross-section reinforcement of the tunnel are determined.

Description

The method to estimate realtime-quantitative stability of the tunnel under construction and it's system}

The present invention relates to a method for evaluating real-time and quantitative stability of a tunnel during construction and its apparatus, and more specifically, to the mechanical properties of the surrounding ground to which the tunnel is excavated, the geometrical size of the tunnel structure and the displacement measurement in the field. The present invention relates to a method for evaluating real-time and quantitative stability of tunnels during construction, and a device capable of performing quantitative stability evaluation of tunnels by mutually evaluating information.

In the case of constructing a tunnel, in order to evaluate the stability of the tunnel as a structure, it is necessary to directly measure the deformation and stress of the tunnel structure. However, because the tunnel structure is directly affected by the mutual behavior with the ground due to the ground excavation, it is necessary to simultaneously evaluate the surrounding ground. In order to evaluate the stability of the tunnel, a method of evaluating the stress generated in the structure or the displacement of the surrounding ground where the stress release is caused by excavation is taken. In this case, in order to measure the stress of the structure, expensive measurement equipment can be embedded only, and thus, time and economic constraints are large. On the other hand, displacement measurement on the excavation ground has the advantage that it can be performed quickly and economically compared to the stress measurement.

Most tunnel sites require measurements related to displacement and stress along with excavation, and it is common to set a constant reference value at each site and to maintain stability if the measurement result is within the reference value. However, these standards are different from country to country, from institution to institution and from site to site, and there is no clear guidance on the evidence. The current situation is that even the measurement work is neglected.

However, the displacement value at the tunnel construction site is very meaningful information that numerically expresses the mutual influences of the tunneling and excavation conditions related to the tunnel excavation under the geological conditions of the measurement point. It can be used as a core to induce economic tunnel construction by quantitatively evaluating the support effect of the placed support material as well as determining the stability of the tunnel under construction.

An object of the present invention for solving the above problems is to evaluate the quantitative stability of a tunnel by evaluating mutually the mechanical properties of the surrounding ground where the tunnel is excavated, the geometric size of the tunnel structure and the displacement measurement information in the field. To provide a real-time, quantitative stability evaluation method and apparatus for tunnels during construction.

In order to achieve the above object, the real-time and quantitative stability evaluation method for the tunnel during construction of the present invention measures displacement information on the excavation ground by using displacement measuring means installed in and around the tunnel. Field measurement step; A strain calculation step for calculating strain using the measured displacement information; Tunnel stability evaluation step of determining the stability and cross-sectional reinforcement of the tunnel by showing the strain strain calculated in the excavation tunnel in real time on the limit strain boundary diagram;

Another characteristic of the real-time, quantitative stability evaluation method for the tunnel during the construction of the present invention, the strain calculation step, using the displacement measured in the field by using the displacement measured by the size of the tunnel or the distance between the two measurement points using the measurement displacement method The analysis model is used to calculate the strain by FEM elastic body numerical analysis by inputting the displacement measured in the field to the inverse formulation analysis program, and by using the tunnel information, ground information, and support information, which are various information related to tunnel construction. One or more of the artificial neural network methods for calculating strains using neural network techniques are used.

Another characteristic of the real-time, quantitative stability evaluation method for the tunnel during construction of the present invention is that the measurement displacement using the measured displacement measured at the construction site, the equivalent displacement corresponding to the excavated cross-sectional area Strain obtained by dividing, Strain obtained by dividing the pore displacement by the distance between two points, Strain obtained by dividing the displacement difference obtained by the horizontal inclinometer or underground displacement meter between two points by the distance between two points, conventional instrument, laser scanner equipment, digital photogrammetry By using any one or more of the equipment, one or more of the strains obtained by calculating the displacement difference on the reflecting target, the light prism, and the non-targeting excavation surface, and dividing it by the equivalent radius corresponding to the excavated cross-sectional area.

Another feature of the real-time, quantitative stability evaluation method for the tunnel during construction of the present invention is that the analysis model using the inverse formulation method, input the measurement displacement value for the tunnel excavation surface, Estimation of the stress state of the surrounding ground using the FEM elastic body numerical analysis by support modeling, and numerical analysis of the elastic ground using the estimated stress state to calculate the compressive strain distribution of the surrounding ground, It is achieved by determining the maximum compressive strain among the strain values.

Another characteristic of the real-time, quantitative stability evaluation method for the tunnel during the construction of the present invention is that the artificial neural network method includes tunnel information and tunnel layer composed of tunnel type, shape, height, width, depth of excavation, excavation method, and excavation method. Composition, depth, uniaxial compressive strength, limit strain, fracture strain, tensile strength, unit weight, specific gravity, Poisson's ratio, absorption rate, modulus of elasticity (indoor / outdoor test), P wave, S wave, adhesion force, internal friction angle Ground information consisting of N value, permeability coefficient, RQD, RMR and Q values, Rockbolt length / spacing / diameter / shotcrete type / thickness / steel material type / standard / spacing / auxiliary support type / standard Using the information of the interval, casting time, and elapsed time, and in the absence of displacement measurement information, the strain at the excavation point is calculated using a generalized artificial neural network technique. .

Another characteristic of the real-time, quantitative stability evaluation method for the tunnel during construction of the present invention is that, in the tunnel stability evaluation step using the limit strain boundary diagram, the upper and lower boundary on the limit strain boundary diagram is set to the maximum allowable width, The tunnel stability of the tunnel is evaluated by comparing with the various strains calculated by the measurement displacement method, the analysis model method and the artificial neural network method. Tunnel excavation is continued until the end of the tunnel stability evaluation. If the stability is not secured, the section reinforcement is examined and additional support is placed to stop the deformation.

The real-time, quantitative stability evaluation judgment device for the tunnel during construction of the present invention to solve the above problems, in order to calculate the strain using the displacement measurement results and to evaluate the stability with the calculated strain, in the construction site of the excavation tunnel Displacement measurement means for obtaining displacement measurement information for the excavation ground; Underground displacement measuring means for measuring the pre and post ground displacements generated while the excavation is progressing by using the underground displacement gauge pre-installed in the unexcavated ground; Membrane front displacement measurement means for measuring the displacement of the tunnel curtain using a horizontal inclinometer pre-installed in the unearthed ground; A computer for evaluating tunnel stability by inputting various displacement information obtained through the displacement measuring means, the ground displacement measuring means, and the membrane front displacement measuring means; And inputting and transmitting means for transmitting the information obtained from the displacement measuring means, the underground displacement measuring means, and the membrane front displacement measuring means to the computer.

According to another aspect of the present invention, a real-time, quantitative stability evaluation judgment device for a tunnel is provided. The displacement measuring means is installed in and around a tunnel to measure a level gauge for measuring displacement information on an excavation ground and a pore displacement gauge. , At least one of a conventional instrument, a laser scanner device, and a digital photogrammetry device.

The displacement information measured during the excavation at the tunnel construction site is a very meaningful information that numerically expresses the mutual influences of tunnel structures, ground conditions, and excavation conditions under the geological conditions of the measurement point. In addition, the determination of the stability of the tunnel under excavation can be carried out quickly and quantitatively based on the epidemiological evidence. In view of the above, the present invention enables the real-time and quantitative evaluation of the stability of the tunnel structure by the concept of the limit strain by utilizing the displacement information obtained through various displacement measuring means in the tunnel under construction. The critical strain is one of the mechanical properties of the surrounding ground where the tunnel is excavated, and provides a uniform and consistent guideline for the displacement management criteria in tunnel construction.

In the tunnel construction site, the present invention is characterized by the mechanical properties of the ground, using the limit strain, which is the mechanical property defined by the ratio of the uniaxial compressive strength at the time of failure to the initial tangent modulus in the uniaxial compression test of the rock. It is used as a unified management standard value. In addition, as the strain at the construction site for comparison with the critical strain, which is the management standard value at this time, the stability of the excavation tunnel is evaluated using the strain obtained by any one or more of the following three methods. First, the strain determined using the measured displacement measured at the tunnel construction site, and second, the maximum compressive strain determined by inputting the measured displacement at the excavation surface to the analysis program developed using the inverse formulation method. In the absence of specific displacement measurement information, the strain obtained by any one or more of the strains calculated by the artificial neural network method using tunnel information, ground information, and support information is shown in a limit strain boundary chart in real time, and thus the stability of the tunnel Will be evaluated.

In the present invention, wherever the tunnel is constructed to establish the measurement management reference value at the tunnel construction site, it can be used as a uniform and consistent standard, and for this purpose, the strain strain, which is a mechanical property value for the ground around the tunnel excavation, is newly used. Using this, the marginal strain diagram is also presented. The critical strain boundary diagram presents the limit of the maximum allowable displacement in tunnel excavation by utilizing the strength of the ground around the tunnel excavation and the geometric size of the tunnel structure. Therefore, it is a quantitative evaluation method based on mechanical properties, compared to the existing geological qualitative evaluation method, and can be a measurement management standard that can be easily and conveniently used in the field. Therefore, by utilizing the present invention, as well as a quick and quantitative stability evaluation of the tunnel under excavation, it can be utilized in economic evaluation of the tunnel support, economic tunnel construction can be achieved.

In the field measurement step of the present invention, the displacement measuring instrument installed in the excavated tunnel and the periphery of the tunnel (longitudinal and transverse directions) (top end pin, pitting pin, underground displacement gauge, horizontal tilt meter, reflection target, light wave prism, no target It is to measure excavation displacement using level instrument, hole displacement meter, conventional instrument, laser scanner equipment, digital photogrammetry equipment using excavation surface.

In the field measurement step of the present invention, transmission and reception means for classifying and collecting the measured information to the analysis computer is provided.

Strain calculation step of the present invention, one or more of the following three methods, that is, the method using the measured displacement measured in the construction site, the method using the analysis program developed using the Inverse formulation method (Inverse formulation method) For example, if there is no measurement information, it includes a method using an artificial neural network technique using tunnel information, ground information, and support information.

Here, in order to calculate the strain using the measured displacement measured at the construction site, first, the strain obtained by dividing the top-end displacement by the equivalent radius corresponding to the excavated cross-sectional area, the second strain obtained by dividing the internal displacement by the distance between two points, Third, the strain obtained by dividing the displacement difference obtained from the horizontal inclination system or the ground displacement gauge of two different points by the distance between the two points, and fourth, the reflecting target, the optical prism, and the non-target by the conventional instrument, laser scanner equipment, and digital photogrammetry equipment. It includes the strains obtained by dividing the displacement difference on the excavated surface and dividing it by the equivalent radius corresponding to the excavated cross-sectional area.

In the present invention, a method of utilizing an analysis program developed using an inverse formulation method includes inputting a measurement displacement value for a tunnel excavation surface and using a FEM elastic numerical analysis method by ground, section, and support modeling. Then, the stress state of the surrounding ground is estimated. The numerical analysis of the elastic body is performed again using the estimated stress state to calculate the distribution of compressive strain in the surrounding ground, and the maximum compressive strain is determined. Because the analysis program uses elastic theory, it is possible to estimate the strain in a very short time even on a small computer, so that it is not difficult to quickly evaluate it in the field.

In addition, when there is no measurement information during the strain calculation step, strain is calculated by using an artificial neural network technique using tunnel information, ground information, and support information. Tunnel information includes tunnel type, shape, height, width, excavation depth, excavation method, and excavation method, and geotechnical information includes strata composition and depth, uniaxial compressive strength, limit strain, fracture strain, and tensile strength of rock / rock. Unit weight, specific gravity, Poisson's ratio, water absorption, elastic modulus (indoor / outdoor test), P wave, S wave, adhesion, internal friction angle, N value, permeability coefficient, RQD, RMR, Q value. Rock bolt length / spacing / diameter / type of shotcrete / thickness / steel material type / standard / spacing / auxiliary paper type / standard / spacing / pouring time and elapsed time. Using this information, in the absence of displacement measurement information, the strain at the excavation point can be inferred from a database based on existing cases, using a generalized artificial neural network technique.

In the tunnel stability evaluation step of the present invention, the above-described strain is determined in real time on the prepared limit strain boundary diagram and compared with the upper and lower boundary values of the limit strain. At the moment beyond the lower boundary, the boundary should be inclined to secure stability. When the displacement continues to increase and approach the upper boundary, the support should be reinforced to deform and the maximum displacement should be set to the upper boundary. Through this construction management, it is possible to introduce a displacement concept to the tunnel under excavation and to quickly and quantitatively evaluate the stability.

Specific features and advantages of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings.

1 is a general flow chart of the real-time, quantitative stability evaluation determination method for the tunnel during the construction of the present invention, Figure 2 is a measurement schematic for obtaining a measurement displacement in the tunnel construction site, to implement the present invention, Figure 3 In order to implement the present invention, it is the utilization of the analysis model for calculating the strain on the ground around the tunnel by using the measured displacement obtained in the tunnel construction site. 4 is an artificial neural network utilization for calculating the strain of the surrounding ground by artificial neural network technique using tunnel information, ground information, support information to implement the present invention, Figure 5 is a unification of tunnel stability evaluation in the present invention The limit strain diagram for the ground used as a general construction management guideline, Figure 6 is a conceptual diagram of the limit strain of the ground defined in the present invention.

The overall flow chart of the real-time, quantitative stability evaluation method for the tunnel during construction of the present invention is roughly divided into the field measurement step 100, strain calculation step 200, tunnel stability evaluation step 300 as shown in FIG. .

In the field measurement step 100, in addition to the tunnel excavation 101, the displacement measurement 102 for the excavation ground is performed at the tunnel construction site. The measurement displacement is comprehensively reviewed for the type, installation method, installation time of the measuring instrument, the distance between the measuring instrument and the membrane, excavation area and excavation method of the ground, and the measurement displacement evaluation (103) for strain calculation (200). Will be performed.

The displacement measuring means 10 used in the field measuring step 100 includes a level measuring instrument, an internal displacement gauge, a conventional wave measuring instrument, a laser scanner device, and a digital photogrammetry device. Can be. The displacement measurement means 10 acquires displacement measurement information 102 for the excavation ground at the construction site of the excavation tunnel 1, and calculates the strain using the displacement measurement result thus obtained, and calculates the stability with the calculated strain. Evaluate.

The underground displacement measurement means 11 and the membrane front displacement measurement means 12 used in the field measurement step 100 refer to measurement equipment. The underground displacement measuring means 11 and the membrane front displacement measuring means 12 are previously installed in the unexcavated ground, and measure both pre and post displacements generated while the excavation is progressing. Since the underground displacement measuring means 11 and the membrane front displacement measuring means 12 should be installed in the ground, they are inserted into the pipe after drilling the tube, and as a result, the displacement of the point is measured.

In the field measurement step 100, a displacement measuring instrument such as a hem pin, a hole pin, a ground displacement meter, a horizontal inclinometer, a reflection target, a light wave prism, and the like are used to measure the displacement of the point where these devices are installed. These are the targets of the measurement points. Therefore, it is used to measure the displacement and settlement of the point by using level gauge, pore displacement meter and conventional wave instrument.

In the strain calculation step 200, the measurement displacement utilization method 201, which is a method obtained by dividing the size of the tunnel 1 or the distance between two measurement points using the displacement 102 measured in the field, the displacement measured in the field 102 ) Is inputted to the inverse formulation analysis program, and the analysis model is used to calculate the strain by the numerical method of FEM elastic body (202). It consists of an artificial neural network method (203) for calculating the strain.

In the tunnel stability evaluation step 300, various strains calculated by the measurement displacement method 201, the analysis model method 202, and the artificial neural network method 203 using the limit strain diagram 301 for utilization of the construction site. The stability of the tunnel 1 is evaluated 303 by comparison 302 with the strain. As a result of the tunnel stability evaluation, if the stability is not secured, the cross-section reinforcement 304 is examined and then the support material is additionally poured 305. On the other hand, if it is determined that the tunnel stability is secured, it moves to the next stage 306 to continue tunnel excavation. This series of stability evaluation process is repeated until the tunnel construction is completed (307).

Figure 2 shows a detailed method for the field measurement step 100 to perform the field measurement, the level measuring instrument, a displacement measurement instrument, a wave measurement instrument, a laser as a displacement measuring means 10 at the construction site for the excavation tunnel (1) From the scanner equipment and digital photogrammetry equipment, displacement measurement information 102 for the excavation ground is obtained. As another measuring means for acquiring displacement by excavation, the underground displacement measuring means 11 installed in the tunnel surrounding ground and the membrane front displacement measuring means 12 by a horizontal inclinometer to measure the front displacement of the tunnel curtain are also shown. It is included. The various displacement information thus obtained is transmitted to the analysis computer 14 through the input and transmission means 13 through wired / wireless communication, and is utilized for tunnel stability evaluation.

FIG. 3 shows a detailed flowchart of an analysis model using method 202 for estimating strain on a tunnel excavation ground using various displacement information obtained in the field. The input displacement information 210 input to the analysis program is the displacement program input displacement information 15 measured in the field, the ground modeling 220 for the tunnel excavation ground, the cross-sectional modeling 230 for the tunnel section, Jibo modeling 240 for each of the support material 16 will be performed. After that, numerical analysis of the FEM elastic body is carried out using the analysis program. As a result of the analysis, the stress (17) on the surrounding ground is output (250), and the compressive strain distribution on the ground around the tunnel (18) is used. 260 is calculated, and finally, the maximum compressive strain for comparison is shown and calculated on the limit strain boundary diagram 270.

Here, 'FEM', which stands for Finite Element Method, refers to a finite element analysis method using a computer. 'Elastic body' refers to the ground as an elastic body, and the 'numerical analysis' technique refers to a method for solving the relationship between stress and strain.

Therefore, the numerical analysis of FEM elastic body means that the relationship between force and displacement is set to elastic relationship by using a computer, and the object, that is, the ground, is divided into small pieces and is widely used in general engineering fields.

On the other hand, a program using inverse formulation has been developed by the inventor of the present application and has been registered as a paper and a program. (Program Registration: 2007-01-123-003505, Name: F-BAP, Date of Registration: July 10, 2007, Program Author: Park Si-hyun, Shin-seok)

An overview of the program using inverse formulation is shown in the table below.

4 shows an artificial neural network using method 203, which is another method of calculating the strain on the excavated ground. Various information that can be utilized in the artificial neural network technique is summarized as tunnel information, ground information, and support information, and the details are summarized in the table. The artificial neural network method is to determine the empirical strain obtained based on the existing use case by using the relevant data of tunnel structure, ground and support material when the displacement measurement information is not secured at the construction site. A database of relevant data needs to be established.

This neural network technique also means a tool for determining strain, such as FEM elastic numerical analysis. Just as the FEM technique calculates strain using the force-displacement relationship, the artificial neural network technique uses tunnel information, ground information, and support information to determine the strain at the site location based on existing data. The application of neural network technique is to find the strain and then evaluate it with the concept of marginal strain.

Figure 5 shows the boundary of the critical displacement for determining the stability for the tunnel under excavation using the concept of limit strain. In this chart, the marginal strain is evaluated using the ground strength, which is the most general information of the ground, so it can be used as a unified standard for various sites where tunnels are constructed. In addition, this chart was proposed by the British Tunnel Association in 2004, but has already been proved the utility of the domestic ground, the present invention will use the existing chart as it is. In order to utilize the marginal strain boundary diagram for the construction work, it was divided into five types according to the ground strength: clay, earth and sand, weathered rock, soft rock, and hard rock. In determining the tunnel stability, the upper and lower boundary lines are used, and it is possible to further utilize the middle boundary line by taking the middle value. When evaluating stability in the field, it is necessary to tilt the tunnel stability from the moment beyond the lower boundary, and if the displacement continues to increase and approach the upper boundary, the support should be reinforced to stop the deformation. Set to the border.

In the tunnel stability evaluation step 300, a method of comparing the various strains calculated with the limit strain diagram 301 for utilization of construction sites is as follows.

Strain is represented by one numerical value. For example, the strain is determined by numerical values such as 0.49, 1.25 and the like. Determine the uniaxial compressive strength at the position where this strain is determined, and then plot it on the limit strain chart. This determines if the floated point is taken below or above the two boundary lines.

If the floated point is below the lower boundary, it is unconditionally safe, and if it exceeds the lower boundary, attention is required. It can be used immediately on site to assess safety.

Figure 6 shows a conceptual diagram of the limit strain that is presented as a unified standard of tunnel construction management in the present invention. The critical strain is one of the mechanical properties of the ground and is defined as the ratio of the uniaxial compressive strength at break to initial tangential modulus in the uniaxial compression test of core samples on the excavated ground. The critical strain will always have a value less than the failure strain, and if this is used, an engineering conservative assessment can be made. In the boundary diagram of limit strain of FIG. 5, the upper and lower boundary lines may mean the limit strain by uniaxial compression test.

Figure 1 is a flow chart of the real-time, quantitative stability evaluation for the tunnel construction during the present invention is implemented

Figure 2 is a schematic diagram for measuring the measurement displacement in the tunnel construction site to implement the present invention

Figure 3 is an application of the analysis model for calculating the strain on the ground around the tunnel by using the measured displacement obtained in the tunnel construction site to implement the present invention

Figure 4 is an artificial neural network utilization for calculating the strain of the surrounding ground by the artificial neural network technique using tunnel information, ground information, support information to implement the present invention

5 is a boundary diagram of the limit strain for the ground used as a uniform construction management guideline of the tunnel stability evaluation in the present invention

Figure 6 is a conceptual diagram of the limit strain of the ground defined in the present invention

* Description of the symbols for the main parts of the drawings *

1: tunnel 10: displacement measuring means

11: ground displacement measurement means 12: membrane displacement measurement means

13 input and transmission means 14 analysis computer

15: Displacement information for analysis program input 16: Modeled support

17: Output ground reaction force around tunnel 18: Distribution of compressive strain of ground

Claims (8)

A field measurement step (100) for measuring (102) displacement information on the excavation ground using the measurement means (10) (11) (12) for displacement measurement installed in the tunnel (101) and around the tunnel (1); Strain calculation step (200) for calculating strain using the measured displacement information; Tunnel stability evaluation step (300) for determining the stability of the tunnel and whether the cross section reinforcement by showing the strain strain calculated in the tunnel in real time in real time on the limit strain boundary diagram (301); Quantitative stability assessment method. According to claim 1, wherein the strain calculation step 200, Measurement displacement using method (201) to obtain strain by dividing by tunnel size or distance between two measurement points using displacement 102 measured in the field; An analysis model using method 202 for inputting the displacement 102 measured in the field into an inverse equation analysis program and calculating the strain by FEM elastic numerical analysis method; In the artificial neural network using method (203) which calculates strain using artificial neural network technique by utilizing various information related to tunnel construction, tunnel information, ground information and support information, Real-time, quantitative stability evaluation method for the tunnel during construction, characterized in that made using any one or more methods. The method of claim 2, wherein the measurement displacement utilization method 201 that calculates the strain using the measurement displacement measured at the construction site, Strain obtained by dividing the tip displacement by the equivalent radius corresponding to the excavated cross-sectional area, Strain obtained by dividing the internal displacement by the distance between two points, The strain obtained by dividing the displacement difference obtained from the horizontal inclination system or the ground displacement gauge of two different points by the distance between the two points, Of the strains calculated by dividing the displacement difference in the reflective target, optical prism, or non-target excavation surface by at least one of the conventional instrument, laser scanner equipment, and digital photogrammetry equipment, and dividing it by the equivalent radius corresponding to the excavated cross-sectional area. Real-time, quantitative stability evaluation method for the tunnel during construction, characterized in that made by any one or more strain calculation method. The method of claim 2, wherein the analysis model using method 202 using the inverse formulation technique, Input the measured displacement value for the tunnel excavation surface (210), The ground state (220), cross-section modeling (230), support modeling (240) by using the FEM elastic numerical analysis method, to estimate the stress state of the surrounding ground (250), The numerical analysis of the elastic body is performed again using the estimated stress state to calculate the compressive strain distribution (18) of the surrounding ground (260), Determination method of the real-time, quantitative stability for the tunnel during construction, characterized in that by determining the maximum compression strain among the calculated compression strain values (270). According to claim 2, The artificial neural network method 203, Tunnel information consisting of tunnel type, shape, height, width, depth of excavation, excavation method, excavation method, Strata composition and depth, uniaxial compressive strength, limit strain, fracture strain, tensile strength, unit weight, specific gravity, Poisson's ratio, absorption rate, modulus of elasticity (indoor / outdoor test), P wave, S wave, adhesion, internal Ground information consisting of friction angle, N value, permeability coefficient, RQD, RMR and Q values, Supporting information consists of rock bolt's length / spacing / diameter / type of shotcrete / thickness / steel material type / standard / spacing / auxiliary paper type / standard / spacing / pouring time and elapsed time. Determination method for real-time and quantitative stability of tunnels during construction, in which there is no displacement measurement information, the strain is calculated through the database according to the existing case by using the generalized neural network technique. . According to claim 1, Tunnel stability evaluation step 300 using the limit strain boundary diagram 301, Set the upper and lower boundary lines on the limit strain boundary diagram 301 as the maximum allowable displacement width, The tunnel stability of the tunnel is evaluated (303) by comparing (302) various strains calculated by the measurement displacement method (201), the analysis model method (202), and the artificial neural network method (203). As a result of the tunnel stability evaluation (303), if the stability is secured, the tunnel excavation is continued until the next construction is completed (306) and the tunnel construction is completed (307). As a result of the tunnel stability evaluation (303), if the stability is not secured, after examining the section reinforcement (304), the support member is additionally poured (305) to stop the deformation during construction. Real-time, quantitative stability assessment methodology. Displacement measurement means (10) for obtaining displacement measurement information (102) for the excavation ground at the construction site of the excavation tunnel to calculate the strain using the displacement measurement results and to evaluate the stability with the calculated strain; A ground displacement measuring means (11) for measuring before and after ground displacements generated while the excavation proceeds by using a ground displacement gauge previously installed in the unearthed ground; A membrane front displacement measurement means (12) for measuring an omnidirectional displacement of the tunnel curtain using a horizontal inclinometer that is pre-installed in the unearthed ground; A computer (14) for evaluating tunnel stability by inputting various displacement information obtained through the displacement measuring means (10), the underground displacement measuring means (11), and the membrane front displacement measurement means (12); Input and transmission means (13) for transmitting the information obtained from the displacement measuring means (10), the ground displacement measuring means (11), and the membrane front displacement measuring means (12) to the computer (14). Real-time, quantitative stability evaluation judgment device for tunnels during construction. The method of claim 7, wherein the displacement measuring means 10, It is installed in the excavated tunnel and around the tunnel (1) consisting of any one or more of a level instrument, a pore displacement gauge, a conventional instrument, laser scanner equipment, digital photogrammetry equipment for measuring (102) displacement information on the excavated ground Real-time, quantitative stability evaluation judgment device for the tunnel during construction.

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