CN112035937B - Tunnel construction surrounding rock deformation analysis and informatization construction method - Google Patents
Tunnel construction surrounding rock deformation analysis and informatization construction method Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 81
- 239000011435 rock Substances 0.000 title claims abstract description 51
- 238000004458 analytical method Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 54
- 238000004088 simulation Methods 0.000 claims abstract description 39
- 238000011835 investigation Methods 0.000 claims abstract description 8
- 238000004364 calculation method Methods 0.000 claims abstract description 7
- 238000012544 monitoring process Methods 0.000 claims description 34
- 230000005641 tunneling Effects 0.000 claims description 10
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- 230000003014 reinforcing effect Effects 0.000 claims description 5
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- 230000007613 environmental effect Effects 0.000 description 1
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Abstract
The invention aims to provide a tunnel construction surrounding rock deformation analysis and informatization construction method, which comprises the following steps: performing preliminary investigation on a tunnel to be constructed to obtain basic information of tunnel construction; constructing an analysis model, and carrying out numerical simulation on the construction process by adopting finite element software to obtain the deformation characteristics of the tunnel; reading the data of the same type of construction completed in the database, and performing simulation and analysis through the analysis model to obtain the completed data; comparing the obtained data in the construction process with the corresponding completed data to obtain a comparison value; and finding out key points for supporting surrounding rock deformation according to the analyzed result, carrying out targeted supporting and adjusting a corresponding supporting scheme. According to the invention, related mechanical stability research results and calculation methods are introduced into the construction of tunnel engineering in a numerical simulation mode, so that the reliability of the engineering is effectively improved.
Description
Technical Field
The invention relates to the field of tunnel construction, in particular to a deformation analysis and informatization construction method for surrounding rock in tunnel construction.
Background
At present, in the urban construction process, the construction environment is complex, the geological condition is changeable, urban municipal pipelines, overpasses and building foundations are often encountered in the tunnel construction process, the dynamic and static loads of the ground are greatly changed, surrounding rock deformation in the tunnel construction process is often caused, the deformation of the surrounding rock is large, and success and failure of engineering construction are realized.
In the tunnel construction process, the surrounding rock deformation is caused by a plurality of reasons, and the surrounding rock receives the action of external load, and the internal stress loses the original balance state to cause damage; the other is that the shear strength of the rock-soil body is reduced due to external disturbance, thereby causing deformation of surrounding rock.
The monitoring of the deformation of the surrounding rock plays an important role in the feasibility, safety and economy of the whole engineering. If the monitoring is improper, even the tunnel collapses, which causes serious economic problems.
It is known that in the tunnel construction process, the timely monitoring and advanced support of surrounding rock are particularly important, and the problems existing in the current tunnel tunneling process are solved: the current detection focus is on design and construction processes, and in the tunnel construction process, so-called monitoring points are selected too randomly and are mostly empirical, so that the monitoring points are not key points of engineering easily.
Disclosure of Invention
The invention aims to provide a deformation analysis and informatization construction method for surrounding rock of tunnel construction, which can be used for introducing the construction of tunnel engineering in a numerical simulation mode to find key supporting points in the tunnel construction, thereby effectively improving the reliability.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for analyzing the deformation of the surrounding rock in tunnel construction and constructing the surrounding rock in an informationized manner is characterized by comprising the following steps:
performing preliminary investigation on a tunnel to be constructed to obtain basic information of tunnel construction;
constructing an analysis model, and carrying out numerical simulation on the construction process by adopting finite element software to obtain the deformation characteristics of the tunnel;
reading the data of the same type of construction completed in the database, and performing simulation and analysis through the analysis model to obtain the completed data;
comparing the obtained data in the construction process with the corresponding completed data to obtain a comparison value;
and finding out key points for supporting surrounding rock deformation according to the analyzed result, carrying out targeted supporting and adjusting a corresponding supporting scheme.
The method comprises the steps of finding out key points for supporting surrounding rock deformation according to the analyzed result, carrying out targeted supporting and adjusting corresponding supporting schemes, and further comprising:
and acquiring the on-site monitoring result of each hundred meters, obtaining the surrounding rock supporting deformation condition of the next hundred-meter working section through the analysis model, and timely adjusting the corresponding supporting scheme change to always monitor the key points of the surrounding rock deformation.
The "basic information of the tunnel construction" includes:
geological basic information of surrounding rock, the height of a tunnel, tunneling speed, the position environment of the periphery of the tunnel, the composition structure of rock strata of the tunnel, reinforcing support parameters and stress conditions of the reinforcing support.
The construction analysis model, which adopts finite element software to carry out numerical simulation on the construction process to obtain the deformation characteristics of the tunnel, comprises the following steps:
according to the basic information of the tunnel construction, constructing a three-dimensional model diagram of a slope rock layer structure from a longitudinal and transverse rock layer structure in the tunneling process of the tunnel;
dividing the three-dimensional model diagram into a plurality of calculation units, and forming a three-dimensional numerical simulation analysis model in a structural mechanical equation matrix mode;
and predicting rock movement, stress and stress change conditions in the construction process of the high slope according to the three-dimensional numerical simulation analysis model to obtain deformation characteristics of the tunnel.
The "comparing the obtained data in the construction process with the corresponding completed data" includes:
setting a threshold value of the data in the construction process and the corresponding completed data;
when the coincidence degree of the comparison value and the threshold value reaches more than 90%, the existing supporting scheme is not required to be changed;
when the matching degree of the comparison value and the threshold reaches 60% -90%, the existing supporting scheme is adjusted, and the simulation is performed again until the matching degree of the comparison value and the threshold reaches more than 90%;
when the coincidence degree of the comparison value and the threshold value is less than 60%, the tunnel construction is modeled again according to the basic information of the tunnel construction.
Before the preliminary investigation is carried out on the tunnel to be constructed to obtain the basic information of the tunnel construction, the method further comprises the following steps:
monitoring the process of measuring point arrangement:
extending the bottom of the tunnel upwards along an included angle of 45 degrees respectively, and symmetrically arranging more than 3 monitoring points;
the distribution of the above 3 monitoring points is as follows: the distance from the vertical center line of the tunnel is larger and larger.
The beneficial effects brought by the invention are as follows: according to the invention, related mechanical stability research results and calculation methods are introduced into the construction of tunnel engineering in a numerical simulation mode, so that the reliability of the engineering is effectively improved. Meanwhile, the bottom of the tunnel extends upwards along 45-degree included angles respectively, more than 3 monitoring points are symmetrically arranged, key points of deformation in the supporting process of corresponding engineering can be effectively analyzed, the reliability of monitoring data of the supporting structure after excavation is improved through the stability of the simulated supporting structure, and the real state of the tunnel after supporting is more easily reflected.
Drawings
Fig. 1 is a layout of monitoring points.
Fig. 2 is a specific construction flow chart of the present invention.
Wherein the triangles in fig. 1 represent the monitoring point set positions.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Aiming at the defects in the prior art, the invention provides a tunnel construction surrounding rock deformation analysis and informatization construction method, so as to solve the engineering mode caused by surrounding rock deformation in the tunnel construction process.
In order to achieve the above object, as shown in fig. 1 to 2, the present invention comprises the following steps:
1. performing preliminary investigation on a tunnel to be constructed to obtain basic information of tunnel construction; and (3) performing investigation design on the constructed tunnel to obtain the positions of the traffic bridge and the pipeline in the area where the tunnel passes through, and gradually advancing to monitor each key point in the construction process along with the advancing of engineering.
2. Constructing an analysis model, carrying out numerical simulation on the construction process by adopting finite element software to obtain the deformation characteristics of the tunnel, wherein the method comprises the following steps:
numerical simulation is carried out on the construction process by adopting Plaxis3D finite element software, and the deformation condition of the bridge pier top under different working conditions is simulated; by adopting a method of mutual verification of FLAC3D calculation software and a theoretical calculation formula, the system researches the environmental control of crossing the same existing line from top to bottom under complex conditions, and ensures the stability of an excavation surface and the control of earth surface subsidence by improving the shield machine type and the like from the aspect of construction technology. And simulating the construction process by using MIDAS-GTS finite element software to obtain deformation characteristics of the tunnel and the overpass, and guiding construction.
3. Reading the data of the completed construction of the same type in the database, and performing simulation and analysis through the analysis model to obtain the completed data, wherein the method comprises the following steps:
and (3) bringing similar completed projects into the tunnel with the initial tunneling section, performing simulation and analysis, and comparing and analyzing the obtained corresponding working conditions with the constructed real data to achieve the coincidence.
4. Comparing the obtained data in the construction process with the corresponding completed data to obtain a comparison value, wherein the comparison value comprises the following steps:
and (3) according to the numerical simulation analysis model, performing preliminary section tunneling supporting scheme simulation on the project which is ready to be developed. And finding out key points for supporting surrounding rock deformation according to the analyzed result, carrying out targeted supporting and adjusting a corresponding supporting scheme.
5. According to the analyzed result, finding out the key point of supporting surrounding rock deformation, carrying out targeted supporting, and adjusting the corresponding supporting scheme, including:
along with the deep tunneling of engineering, each hundred meters updates corresponding data according to on-site monitoring results, the model further analyzes the surrounding rock supporting deformation condition of the next hundred meters working section, adjusts corresponding supporting scheme changes in time, and monitors key points generating surrounding rock deformation in simulation in a key mode all the time.
The data in the step 1 comprises geological basic information of surrounding rock, the height of a tunnel, tunneling speed, surrounding position environment, the composition structure of rock stratum, reinforcing supporting parameters, stress conditions and the like.
The specific content of the step 2 is as follows: and (3) constructing a longitudinal and transverse rock layer structure in the tunneling process according to the parameters of the investigation and the support design in the step (1), and constructing a three-dimensional model diagram of the slope rock layer structure. The three-dimensional graph is divided into a plurality of calculation units through simulation software, and a three-dimensional numerical simulation analysis model is formed through a structural mechanical equation matrix mode. And analyzing and predicting rock movement, stress and stress change conditions in different construction processes of the high slope according to the three-dimensional numerical simulation analysis model.
After the three-dimensional numerical simulation analysis model established in the step 2 is implemented and before the step 1 is implemented, monitoring data is needed for key points of the established tunnel, so that monitoring of rock movement, stress and stress changes in the construction process of the high slope in different periods in advance is realized, and finally the measured data are transmitted to simulation of numerical model analysis.
It should be noted that: the monitoring observation site for realizing the step 1 in the invention is shown in fig. 1.
Three-level early warning state judging table in construction process
The implementation details of the step 5 are as follows
1. If the simulation result of the step 1 is consistent with the relevant actual engineering or meets the parameter threshold of 90% of the relevant engineering, the step 5 is performed.
2. In the implementation process of the step 5, comparing the monitoring result in the tunnel monitoring process with the simulation result before starting, and when the coincidence degree meeting the threshold value reaches 90%, determining that the protection of the support reaches the corresponding strength range, and performing the simulation of the next stage.
3. In the implementation process of step 5, the monitoring result in the tunnel monitoring process is compared with the simulation result before starting, when the degree of coincidence of the threshold value is lower than 90%, the related supporting engineering needs to be detected, and the related problems possibly existing in the related supporting are solved, so that the monitoring is performed again, and further the next simulation is performed when the degree of coincidence of the corresponding threshold value reaches 90%.
4. And simulating key monitoring points in the construction process of the lower stage according to the simulation result of the previous stage, simulating the support engineering of the lower stage, and analyzing to obtain the monitoring value of the optimal support scheme of the lower stage.
5. When the phase difference of the phase difference between the monitoring value and the simulation value is lower than 60%, the phase difference between the simulation result and the actual phase difference is too large, and the related simulation data is likely to be not completely in line with the engineering reality due to the unsound simulation model, and the re-modeling analysis is needed to be performed again according to the related data of the engineering site.
Advantages of the present invention include:
1. the research results and the calculation method of the related mechanical stability are introduced into the construction of tunnel engineering in a numerical simulation mode, and the reliability of engineering mechanics is effectively improved.
2. The randomness of the monitoring points is effectively solved, key points of deformation in the supporting process of the corresponding engineering are effectively analyzed through advanced numerical analysis, the reliability of the supporting structure monitoring data after excavation can be analyzed through the stability of the simulated supporting structure, and the real state after tunnel supporting is easier to reflect.
3. The utilization rate of the monitoring data is effectively improved, the visibility of the monitoring data is effectively improved through a three-dimensional modeling mode, and the monitoring efficiency is improved.
The present invention is not limited to the above embodiments, and any person skilled in the art can easily change or replace the above embodiments within the scope of the present invention. The protection scope of the invention is therefore subject to the claims.
Claims (5)
1. The method for analyzing the deformation of the surrounding rock in tunnel construction and constructing the surrounding rock in an informationized manner is characterized by comprising the following steps:
performing preliminary investigation on a tunnel to be constructed to obtain basic information of tunnel construction;
constructing an analysis model, and carrying out numerical simulation on the construction process by adopting finite element software to obtain the deformation characteristics of the tunnel;
reading the data of the same type of construction completed in the database, and performing simulation and analysis through the analysis model to obtain the completed data;
comparing the obtained data in the construction process with the corresponding completed data to obtain a comparison value;
finding out key points for supporting surrounding rock deformation according to the analyzed result, carrying out targeted supporting, and adjusting a corresponding supporting scheme;
before the preliminary investigation is carried out on the tunnel to be constructed to obtain the basic information of the tunnel construction, the method further comprises the following steps:
monitoring the process of measuring point arrangement:
extending the bottom of the tunnel upwards along 45-degree clamping pins respectively, and symmetrically arranging more than 3 monitoring points;
the distribution of the above 3 monitoring points is as follows: the distance from the vertical center line of the tunnel is larger and larger.
2. The method for analyzing deformation of surrounding rock in tunnel construction and informationized construction according to claim 1, wherein the method for finding key points for supporting deformation of surrounding rock according to the analyzed result, and performing targeted supporting and adjusting corresponding supporting scheme further comprises:
and acquiring the on-site monitoring result of each hundred meters, obtaining the surrounding rock supporting deformation condition of the next hundred-meter working section through the analysis model, and timely adjusting the corresponding supporting scheme change to always monitor the key points of the surrounding rock deformation.
3. The method for analyzing deformation of surrounding rock for tunnel construction and constructing information according to claim 1, wherein the "basic information of tunnel construction" comprises: geological basic information of surrounding rock, the height of a tunnel, tunneling speed, the position environment of the periphery of the tunnel, the composition structure of rock strata of the tunnel, reinforcing support parameters and stress conditions of the reinforcing support.
4. The method for analyzing deformation of surrounding rock in tunnel construction and constructing information according to claim 1, wherein the constructing an analysis model, performing numerical simulation on a construction process by finite element software to obtain deformation characteristics of the tunnel, comprises:
according to the basic information of the tunnel construction, constructing a three-dimensional model diagram of a slope rock layer structure from a longitudinal and transverse rock layer structure in the tunneling process of the tunnel;
dividing the three-dimensional model diagram into a plurality of calculation units, and forming a three-dimensional numerical simulation analysis model in a structural mechanical equation matrix mode;
and predicting rock movement, stress and stress change conditions in the construction process of the high slope according to the three-dimensional numerical simulation analysis model to obtain deformation characteristics of the tunnel.
5. The method for analyzing deformation of surrounding rock for tunnel construction and informationized construction according to claim 1, wherein said comparing the obtained data in the construction process with the corresponding completed data comprises: setting a threshold value of the data in the construction process and the corresponding completed data;
when the coincidence degree of the comparison value and the threshold value reaches more than 90%, the existing supporting scheme is not required to be changed;
when the matching degree of the comparison value and the threshold reaches 60% -90%, the existing supporting scheme is adjusted, and the simulation is performed again until the matching degree of the comparison value and the threshold reaches more than 90%;
when the coincidence degree of the comparison value and the threshold value is less than 60%, the tunnel construction is modeled again according to the basic information of the tunnel construction.
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| CN113958369B (en) * | 2021-11-10 | 2023-10-20 | 重庆科技学院 | Tunnel lining structure health monitoring method and system based on digital twinning |
| CN115182362A (en) * | 2022-07-20 | 2022-10-14 | 清华大学 | Slope time-sharing partition accurate target protection method and device, electronic equipment and medium |
| CN115455522A (en) * | 2022-07-22 | 2022-12-09 | 北京交通大学 | Optimization method and device of tunnel supporting system |
| CN115829121B (en) * | 2022-11-30 | 2023-09-19 | 河海大学 | Method and system for predicting stability of deep-buried tunnel |
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