CN112035937A - 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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- 230000005641 tunneling Effects 0.000 claims description 9
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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: carrying out preliminary investigation on a tunnel to be constructed to obtain basic information of the 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 data of the same type of construction completed in a database, and simulating and analyzing through the analysis model to obtain the completed data; comparing the obtained data in the construction process with the corresponding finished data to obtain a comparison value; and finding out key points for supporting the deformation of the surrounding rock according to the analyzed result, performing targeted supporting, and adjusting a corresponding supporting scheme. According to the invention, the research result and the calculation method of the relevant mechanical stability are introduced into the construction of the 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 tunnel construction surrounding rock deformation analysis and informatization construction method.
Background
At present, in the urban construction process, the construction environment is complex, the geological conditions are variable, urban municipal pipelines, overpasses and building foundations are often encountered in the tunnel construction process, the change of dynamic and static loads on the ground is large, surrounding rock deformation in the tunnel construction process is often caused, and the deformation of the surrounding rock is large and the success or failure of the construction of the project is caused.
In the tunnel construction process, the deformation of the surrounding rock is caused by a plurality of reasons, generally including the following two types, one is that 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 interference, so that the surrounding rock is deformed.
The method plays an important role in the feasibility, safety and economy of the whole project aiming at monitoring the deformation of the surrounding rock. If the monitoring is not proper, the tunnel can even collapse, and serious economic problems are caused.
As is well known, in the tunnel construction process, the timely monitoring and advanced support of surrounding rocks are particularly important, and the problems existing in the current tunnel tunneling process are solved: the current detection focus is focused on the design and construction process, and in the tunnel construction process, the monitoring points are selected too randomly and mostly by an empirical method, so that the monitoring points are not critical points of the project easily.
Disclosure of Invention
The invention aims to provide a tunnel construction surrounding rock deformation analysis and informatization construction method, which can be used for introducing the construction of tunnel engineering in a numerical simulation mode, finding out key supporting points in tunnel construction and effectively improving the reliability.
The technical scheme adopted by the invention for solving the technical problems is as follows: a tunnel construction surrounding rock deformation analysis and information construction method is characterized by comprising the following steps:
carrying out preliminary investigation on a tunnel to be constructed to obtain basic information of the 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 data of the same type of construction completed in a database, and simulating and analyzing through the analysis model to obtain the completed data;
comparing the obtained data in the construction process with the corresponding finished data to obtain a comparison value;
and finding out key points for supporting the deformation of the surrounding rock according to the analyzed result, performing targeted supporting, and adjusting a corresponding supporting scheme.
After "according to the result of analyzing out, find the key point of strutting the country rock deformation, carry out the pertinence and strut, adjust corresponding support scheme", still include:
acquiring a field monitoring result per hundred meters, obtaining the surrounding rock supporting deformation condition of the next hundred meter working section through the analysis model, adjusting corresponding supporting scheme change in time, and monitoring the key point of the surrounding rock deformation all the time.
The "basic information of the tunnel construction" includes:
the method comprises the following steps of basic geological information of surrounding rocks, the height of a tunnel, the tunneling speed, the position environment around the tunnel, the composition structure of rock strata of the tunnel, reinforcing and supporting parameters and the stress condition of the reinforcing and supporting.
The method for constructing the analysis model and carrying out numerical simulation on the construction process by adopting finite element software to obtain the deformation characteristics of the tunnel comprises the following steps of:
constructing a three-dimensional model diagram of a side slope rock stratum structure according to the basic information of the tunnel construction and the longitudinal and transverse rock stratum structures in the tunneling process;
dividing the three-dimensional model graph into a plurality of computing units, and forming a three-dimensional numerical simulation analysis model in a structural mechanics equation matrix mode;
and predicting the rock mass 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 the deformation characteristics of the tunnel.
The "comparing the obtained data in the construction process with the corresponding completed data" includes:
setting the threshold values of the data in the construction process and the corresponding finished data;
when the goodness of fit between the comparison value and the threshold value reaches over 90 percent, the existing supporting scheme does not need to be changed;
when the goodness of fit between the comparison value and the threshold value reaches 60% -90%, adjusting the existing supporting scheme, and re-simulating until the goodness of fit between the comparison value and the threshold value reaches more than 90%;
and when the goodness of fit of the comparison value and the threshold value reaches below 60%, re-modeling according to the basic information of the tunnel construction.
Before the step of performing preliminary investigation on the tunnel to be constructed to obtain the basic information of the tunnel construction, the method further comprises the following steps of:
monitoring the distribution process of the measuring points:
upwards extending the bottom of the tunnel along an included angle of 45 degrees respectively, and symmetrically arranging more than 3 monitoring points;
the distribution of more than 3 of the monitoring points is: the spacing from the vertical centerline of the tunnel is increasingly greater.
The beneficial effects brought by the invention are as follows: according to the invention, the research result and the calculation method of the relevant mechanical stability are introduced into the construction of the tunnel engineering in a numerical simulation mode, so that the reliability of the engineering is effectively improved. Simultaneously, will tunnel bottom upwards extends along 45 degrees contained angles respectively, and the symmetry sets up monitoring point more than 3, can effectual analysis go out the key point of the supporting in-process deformation of corresponding engineering to through the supporting construction stability of simulation, promote the reliability of supporting construction monitoring data after the excavation, the true state after the reaction tunnel is strutted more easily.
Drawings
Fig. 1 is a layout diagram of monitoring points.
FIG. 2 is a detailed construction flow chart of the present invention.
Wherein the triangles in fig. 1 represent the monitoring point set positions.
Detailed Description
The invention will be further described 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 that an engineering mode caused by surrounding rock deformation in the tunnel construction process is solved.
In order to achieve the above purpose, as shown in fig. 1-2, the present invention comprises the following steps:
1. carrying out preliminary investigation on a tunnel to be constructed to obtain basic information of the tunnel construction; and (3) carrying out survey design on the constructed tunnel to obtain the positions of the traffic bridge and the pipeline in the region where the tunnel passes, and gradually advancing to monitor each key point in the construction process along with the advance of the engineering.
2. Establishing 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, wherein the method comprises the following steps:
carrying out numerical simulation on the construction process by adopting Plaxis3D finite element software, and simulating the deformation condition of the bridge pier top under different working conditions; by adopting a method for mutually verifying FLAC3D calculation software and a theoretical calculation formula, the environmental control of crossing the same existing line from top to bottom under complex conditions is researched, and from the aspect of construction technology, the stability of an excavation surface and the control of surface subsidence are ensured by improving the type of a shield machine and the like. And simulating the construction process by using MIDAS-GTS finite element software to obtain the deformation characteristics of the tunnel and the overpass and guide the construction.
3. Reading data of the same type of construction completed in a database, and simulating and analyzing through the analysis model to obtain the completed data, wherein the data comprises the following steps:
and (4) bringing similar finished projects into the tunnel with the initial excavation section, simulating and analyzing, and comparing and analyzing the obtained corresponding working conditions with constructed real data to achieve 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 according to the numerical simulation analysis model, performing preliminary section tunneling support scheme simulation on the project to be developed. And finding out key points for supporting the deformation of the surrounding rock according to the analyzed result, performing targeted supporting, and adjusting a corresponding supporting scheme.
5. According to the analyzed result, finding out the key point of the deformation of the surrounding rock to support pertinently, and adjusting the corresponding supporting scheme, wherein the method comprises the following steps:
and (3) updating corresponding data according to field monitoring results every hundred meters along with the deep engineering tunneling, further analyzing the surrounding rock supporting deformation condition of the next hundred meter workshop section by using the model, adjusting corresponding supporting scheme changes in time, and performing key monitoring on key points generating surrounding rock deformation in the simulation all the time.
The data in the step 1 comprise basic geological information of surrounding rocks, the height of the tunnel, the tunneling speed, the surrounding position environment, the composition structure of a rock stratum, reinforcing and supporting parameters, stress conditions and the like.
The specific content of the step 2: and (3) constructing longitudinal and transverse rock stratum structures in the tunneling process according to parameters of investigation and support design in the step 1, and constructing a three-dimensional model diagram of the slope rock stratum structure. The three-dimensional graph is divided into a plurality of computing units through simulation software, and a three-dimensional numerical simulation analysis model is formed through a structural mechanics equation matrix mode. And analyzing and predicting rock mass 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 realized and before the step 1 is realized, monitoring data needs to be carried out on key points of the established tunnel, so that the monitoring on rock mass 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 is transmitted to the numerical model analysis simulation.
It should be noted that: the monitoring observation site for implementing step 1 in the present invention is shown in fig. 1.
Three-level early warning state decision table in construction process
The specific implementation of step 5 is as follows
1. And (5) if the simulation result in the step (1) is consistent with the relevant actual engineering or meets a parameter threshold value of 90% of the relevant engineering, performing the step.
2. In the implementation process of the step 5, the monitoring result in the tunnel monitoring process is compared with the simulation result before operation, when the matching degree meeting the threshold reaches 90%, the protection of the support is determined to reach the corresponding strength range, and the simulation of the next stage is carried out.
3. In the implementation process of the step 5, the monitoring result in the tunnel monitoring process is compared with the simulation result before operation, when the coincidence degree meeting the threshold value is lower than 90%, the relevant supporting engineering needs to be detected, the possible relevant problems of the relevant supporting are solved, so that monitoring is carried out again, and further, when the coincidence degree reaching the corresponding threshold value reaches 90%, the next step of simulation is carried out.
4. And simulating key monitoring points in the construction process of the next stage according to the simulation result of the previous stage, simulating the supporting project of the next stage, and analyzing to obtain the monitoring value of the optimal supporting scheme of the next stage.
5. When the difference goodness of fit between the monitored value and the simulated value is lower than 60%, the difference between the simulation result and the actual value is too large, and it is likely that the related simulation data caused by the incompleteness of the simulation model does not completely accord with the actual engineering, and the re-modeling analysis needs to be carried out according to the related data of the engineering site.
The advantages of the invention include:
1. the research results and the calculation method of the relevant mechanical stability are efficiently introduced into the construction of the tunnel engineering in a numerical simulation mode, and the reliability of the engineering mechanics is effectively improved.
2. The monitoring method has the advantages that randomness of monitoring points is effectively solved, key points of deformation in the supporting process of corresponding engineering are effectively analyzed through advanced numerical analysis, reliability of monitoring data of the supporting structure after excavation can be analyzed through the stability of the supporting structure, and the real state after tunnel supporting is easily reflected.
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 above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily change or replace the present invention within the technical scope of the present invention, and the present invention is within the scope of the present invention. Therefore, the protection scope of the present invention is subject to the protection scope of the claims.
Claims (6)
1. A tunnel construction surrounding rock deformation analysis and information construction method is characterized by comprising the following steps:
carrying out preliminary investigation on a tunnel to be constructed to obtain basic information of the 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 data of the same type of construction completed in a database, and simulating and analyzing through the analysis model to obtain the completed data;
comparing the obtained data in the construction process with the corresponding finished data to obtain a comparison value;
and finding out key points for supporting the deformation of the surrounding rock according to the analyzed result, performing targeted supporting, and adjusting a corresponding supporting scheme.
2. The method for analyzing and informationizing construction of surrounding rock deformation in tunnel construction according to claim 1,
after "according to the result of analyzing out, find the key point of strutting the country rock deformation, carry out the pertinence and strut, adjust corresponding support scheme", still include:
acquiring a field monitoring result per hundred meters, obtaining the surrounding rock supporting deformation condition of the next hundred meter working section through the analysis model, adjusting corresponding supporting scheme change in time, and monitoring the key point of the surrounding rock deformation all the time.
3. The method for analyzing and informationizing construction of surrounding rock deformation in tunnel construction according to claim 1,
the "basic information of the tunnel construction" includes:
the method comprises the following steps of basic geological information of surrounding rocks, the height of a tunnel, the tunneling speed, the position environment around the tunnel, the composition structure of rock strata of the tunnel, reinforcing and supporting parameters and the stress condition of the reinforcing and supporting.
4. The method for analyzing and informationizing construction of surrounding rock deformation in tunnel construction according to claim 1,
the method for constructing the analysis model and carrying out numerical simulation on the construction process by adopting finite element software to obtain the deformation characteristics of the tunnel comprises the following steps of:
constructing a three-dimensional model diagram of a side slope rock stratum structure according to the basic information of the tunnel construction and the longitudinal and transverse rock stratum structures in the tunneling process;
dividing the three-dimensional model graph into a plurality of computing units, and forming a three-dimensional numerical simulation analysis model in a structural mechanics equation matrix mode;
and predicting the rock mass 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 the deformation characteristics of the tunnel.
5. The method for analyzing and informationizing construction of surrounding rock deformation in tunnel construction according to claim 1,
the "comparing the obtained data in the construction process with the corresponding completed data" includes:
setting the threshold values of the data in the construction process and the corresponding finished data;
when the goodness of fit between the comparison value and the threshold value reaches over 90 percent, the existing supporting scheme does not need to be changed;
when the goodness of fit between the comparison value and the threshold value reaches 60% -90%, adjusting the existing supporting scheme, and re-simulating until the goodness of fit between the comparison value and the threshold value reaches more than 90%;
and when the goodness of fit of the comparison value and the threshold value reaches below 60%, re-modeling according to the basic information of the tunnel construction.
6. The method for analyzing and informationizing construction of surrounding rock deformation in tunnel construction according to claim 1,
before the step of performing preliminary investigation on the tunnel to be constructed to obtain the basic information of the tunnel construction, the method further comprises the following steps of:
monitoring the distribution process of the measuring points:
upwards extending the bottom of the tunnel along 45-degree clamping legs respectively, and symmetrically arranging more than 3 monitoring points;
the distribution of more than 3 of the monitoring points is: the spacing from the vertical centerline of the tunnel is increasingly greater.
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Cited By (5)
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| CN112733221A (en) * | 2020-12-25 | 2021-04-30 | 中国科学院地质与地球物理研究所 | Optimization design method and system for reinforcing side slope by using anti-slide pile |
| CN113958369A (en) * | 2021-11-10 | 2022-01-21 | 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 |
| CN115829121A (en) * | 2022-11-30 | 2023-03-21 | 河海大学 | Method and system for predicting stability of deep-buried tunnel |
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| CN112733221A (en) * | 2020-12-25 | 2021-04-30 | 中国科学院地质与地球物理研究所 | Optimization design method and system for reinforcing side slope by using anti-slide pile |
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| CN113958369A (en) * | 2021-11-10 | 2022-01-21 | 重庆科技学院 | Tunnel lining structure health monitoring method and system based on digital twinning |
| 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 |
| CN115829121A (en) * | 2022-11-30 | 2023-03-21 | 河海大学 | Method and system for predicting stability of deep-buried tunnel |
| 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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| CN112035937B (en) | 2023-12-22 |
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