CN116401872B - Method for evaluating construction stability of small-clearance highway tunnel in complex geological environment - Google Patents
Method for evaluating construction stability of small-clearance highway tunnel in complex geological environment Download PDFInfo
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Abstract
The invention relates to the technical field of highway tunnels, and discloses a method for evaluating construction stability of a small-clearance highway tunnel in a complex geological environment, which comprises the following steps: acquiring engineering information of a corresponding small clear distance highway tunnel; according to the obtained engineering information, a construction geometric model of the small clear distance highway tunnel is established, wherein the geometric model comprises a tunnel body, a surrounding rock body and a lining structure; according to the construction geometric model and the acquired engineering information, based on a Drucker-Prager yield criterion, establishing a construction physical model of the small clear distance highway tunnel; according to engineering information, based on a construction geometric model and a construction physical model, carrying out numerical simulation and analog calculation in the construction process of the small-clear-distance highway tunnel, and generating a corresponding calculation result; and comprehensively evaluating the stability of the construction process of the small-clearance highway tunnel based on the lining structure strength parameter and the standard rule according to the resolving result, and generating a corresponding evaluation result.
Description
Technical Field
The invention relates to the technical field of highway tunnels, in particular to a method for evaluating construction stability of a small-clearance highway tunnel in a complex geological environment.
Background
Along with the rapid development of high-grade highway construction, the highway is often limited by conditions such as topography when selecting lines, so that the minimum clear distance between two adjacent tunnels cannot meet the requirements of design specifications, and therefore, a special tunnel arrangement mode that the thickness of a middle rock wall in a tunnel is smaller than the minimum clear distance of separated independent double holes, namely a small clear distance highway tunnel, appears. When facing the complex geological conditions of karst stratum, gas-containing stratum, broken stratum and the like, the construction difficulty of the small-clearance highway tunnel is increased sharply, so that the construction stability is very important to evaluate.
The stability evaluation in the existing small clear distance highway tunnel construction process is more than that of the already constructed tunnel mileage, but the stability evaluation cannot be carried out in the whole process of the small clear distance highway tunnel construction, so that unreasonable problems of a tunnel construction scheme can be caused, for example, unreasonable irreversible matters such as the occurrence of the unreasonable tunnel construction scheme of half of the tunnel construction scheme can be caused, and meanwhile, the comprehensive evaluation of the whole small clear distance highway tunnel construction scheme cannot be carried out by staff, so that the follow-up problems cannot be well known, and the uncertainty of construction is greatly increased.
Disclosure of Invention
The invention aims to provide a method for evaluating the construction stability of a small-clearance highway tunnel in a complex geological environment, which can solve the limitation of the prior art in evaluating the construction stability of the small-clearance highway tunnel, and realize the evaluation of the stability of the whole construction process of the small-clearance highway tunnel, thereby reducing the uncertainty of the construction process.
In order to achieve the above purpose, the invention adopts the following technical scheme: a method for evaluating the construction stability of a small clear distance highway tunnel in a complex geological environment comprises the following steps:
s1, acquiring engineering information of a corresponding small clear distance highway tunnel, wherein the engineering information comprises design information, construction information and geological information;
s2, building a construction geometric model of the small clear distance highway tunnel according to the acquired design data information, wherein the geometric model comprises a tunnel body, a surrounding rock body and a lining structure;
s3, building a construction physical model of the small clear distance highway tunnel based on a cutter-Prager yield criterion according to the construction geometric model and the acquired design information, construction information and geological information;
s4, carrying out numerical simulation and analog calculation in the construction process of the small-clearance highway tunnel based on the construction geometric model and the construction physical model according to the design data information, the construction data information and the geological data information, and generating a corresponding calculation result; the numerical simulation calculation comprises calculation of stratum dead weight stress field and calculation of tunnel construction process; the resolving result comprises the maximum principal stress of the lining structure, the minimum principal stress of the lining structure, the horizontal displacement of the lining structure and the vertical displacement of the lining structure;
s5, comprehensively evaluating the stability of the construction process of the small-clear-distance highway tunnel based on the lining structure strength parameter and standard rules according to the generated maximum main stress of the lining structure, the minimum main stress of the lining structure, the horizontal displacement of the lining structure and the vertical displacement of the lining structure, and generating a corresponding evaluation result.
The principle and the advantages of the scheme are as follows: in the scheme, engineering information of a small-clearance highway tunnel is firstly acquired, wherein the engineering information comprises design data information, construction data information and geological data information in order to ensure the comprehensiveness of the acquired information, then a construction geometric model of the small-clearance highway tunnel is established by utilizing the corresponding design data information, then a construction physical model of the small-clearance highway tunnel is constructed through the engineering information and the corresponding construction geometric model, in the process, the corresponding criterion is based on Drucker-Prager yield criterion, so that reality can be reduced more accurately, the authenticity and accuracy of model establishment are greatly improved, then corresponding numerical simulation solution is carried out through the established models, and the solution of a stratum self-weight field and the solution of a tunnel stratum construction process are particularly carried out, wherein the solution of the self-weight field can effectively analyze the original deformation and stress condition of the stratum, is a basic condition for analyzing the stability of the small-clearance highway tunnel construction process, after all the solutions are completed, the corresponding solution is based on the Drucker-Prager yield criterion, the lining structure can be generated, the maximum corresponding solution stress can be calculated, the lining structure can be quickly moved to a lining structure is calculated, and the lining structure can be quickly and the lining structure is quickly moved by the lining structure has a standard, and the lining structure is quickly and the lining structure has a stable structure.
1. The method for evaluating the small clear distance highway tunnel in the prior art mainly can only monitor the constructed tunnel mileage, but cannot predict and evaluate the tunnel construction stability in the whole dynamic process of the small clear distance highway tunnel construction, in the method, the evaluation of the safety stability of the small clear distance highway tunnel construction process is realized by utilizing a numerical simulation and analog resolving mode, and in the process of acquiring early data, the method can ensure the uniqueness and the practicability of the model establishment according to the geological data information, the related data information and the construction data information of the actual site of the small clear distance highway tunnel, and can timely and quickly judge the rationality of the construction scheme of the whole small clear distance highway tunnel before and during the whole construction of the small clear distance highway tunnel, thereby providing an important basis for the selection of a construction method, a lining mode and the like.
2. This, when building the physical model, is based on the Drucker-Prager yield criterion, ensures accuracy and precision in describing the deformation of the material.
3. The basis of evaluation when evaluating the stability of the small clear distance highway tunnel construction process comprises the maximum main stress of the lining structure, the minimum main stress of the lining structure, the horizontal displacement of the lining structure and the vertical displacement of the lining structure, namely the stability of the tunnel construction is comprehensively evaluated through the lining stress field and the displacement field, and the accuracy and the reliability of the stability evaluation are greatly improved.
4. Before the model is constructed, the used data are design data information, construction data information and geological data information are also included, and through real acquisition of the data, the corresponding data are real and comprehensive, so that the fitting reality after the model is constructed is greatly improved.
Preferably, as a modification, the step S3 includes the following steps:
s30, constructing a material constitutive model suitable for the small-clearance highway tunnel based on a Drucker-Prager yield criterion according to the acquired geological data information and the geometric model;
s31, selecting material units of the tunnel body, the surrounding rock body and the lining structure according to the material constitutive model, and endowing the material units with corresponding material physical and mechanical parameters;
s32, according to preset model initial conditions and boundary conditions, carrying out model mesh division on the material constitutive model based on the principle that key parts are dense and outwards gradually sparse, and obtaining a corresponding construction physical model.
The beneficial effects are that: in the scheme, the real restoration of the physical model of the small-clear-distance highway tunnel is realized by a plurality of columns of criteria and principles, so that the authenticity and the reliability of model construction are greatly improved; when the physical model is built, the method has the uniqueness and the practicability of objects according to geology, design and construction data of field engineering, meanwhile, different structures of the model are endowed in the building process of the physical model, namely, the model is divided into a corresponding tunnel body, a surrounding rock body and a lining structure, then the deformation of the model structure is accurately described through the setting of yield criteria, the building authenticity and accuracy of the physical model are greatly improved, meanwhile, specific materials are selected according to the characteristics of each structure, the corresponding structure is more in accordance with the real scene, the simulated physical model can be more in accordance with the reality, more accurate data are provided for the calculation of the final result, and the accuracy of the post stability assessment is greatly improved.
Preferably, as a modification, the Drucker-manager yield criterion is:
in the middle ofIs the average stress; />Is a bias stress; />Is a material constant; />Is +.about.in Mises yield criterion>C is cohesive force,>is the internal friction angle.
The beneficial effects are that: in the scheme, deformation of the rock, concrete and soil materials can be accurately described through setting of the Drucker-Prager yield criterion, so that accuracy of material deformation is realized, and reality can be fitted more truly.
Preferably, as an improvement, the lining structure needs to be passivated when the gravity field of the stratum is resolved, and the lining structure needs to be activated when the tunnel construction process is resolved.
The beneficial effects are that: reasonable activation and passivation of the lining structure can enable the respective resolving result to be more real and fit to be practical.
Drawings
Fig. 1 is a flowchart of a method for evaluating the construction stability of a small clear distance highway tunnel in a complex geological environment according to a first embodiment of the invention.
Fig. 2 is a schematic diagram of a geometric model according to a first embodiment of the present invention.
Fig. 3 is a block diagram of a sio 92 unit in accordance with a first embodiment of the present invention.
Fig. 4 is a schematic view of minimum principal stress of a liner structure according to an embodiment of the present invention.
Fig. 5 is a schematic view of maximum principal stress of a liner structure according to an embodiment of the present invention.
FIG. 6 is a schematic diagram of a vertical displacement increment according to an embodiment of the invention.
Fig. 7 is a schematic diagram of a horizontal displacement increment in accordance with an embodiment of the present invention.
FIG. 8 is a diagram illustrating physical model constraints in accordance with a first embodiment of the present invention.
Detailed Description
The following is a further detailed description of the embodiments:
an example is substantially as shown in figure 1: the method for evaluating the construction stability of the small clear distance highway tunnel in the complex geological environment comprises the following steps:
s1, acquiring engineering information of a corresponding small clear distance highway tunnel, wherein the engineering information comprises design information, construction information and geological information; in this embodiment, the design data information includes a tunnel design plan, a design section, and a left-right line tunnel positional relationship feature, and the construction data information includes a construction method, a support manner, and a support material property; the geological data information comprises stratum lithology, surrounding rock physical and mechanical properties, geological structures and hydrogeological conditions.
S2, building a construction geometric model of the small clear distance highway tunnel according to the acquired design data information, wherein the geometric model comprises a tunnel body, a surrounding rock body and a lining structure; in this embodiment, ANSYS simulation software is used to build a geometric model of the construction of the small-clearance highway tunnel in combination with construction design data of the object engineering, and the geometric model unit must include a tunnel body, a surrounding rock body and a lining structure, and the geometric model is shown in fig. 2.
S3, building a construction physical model of the small clear distance highway tunnel based on a cutter-Prager yield criterion according to the construction geometric model and the acquired design information, construction information and geological information;
the step S3 comprises the following steps:
s30, constructing a material constitutive model suitable for the small-clearance highway tunnel based on a Drucker-Prager yield criterion according to the acquired geological data information and the geometric model; specifically, the Drucker-Prager yield criterion is:
in the middle ofIs the average stress; />Is a bias stress; />Is a material constant; />Yield to MisesIn criterion +.>C is cohesive force,>is the internal friction angle.
S31, selecting material units of the tunnel body, the surrounding rock body and the lining structure according to the material constitutive model, and endowing the material units with corresponding material physical and mechanical parameters; in this embodiment, the tunnel and surrounding rock adopt a sio 92 unit, as shown in fig. 3, the unit is a 10-node secondary high-precision unit, has a coordinated displacement property function, can adapt to irregular shapes without losing too much precision, has a thin and hard characteristic, can adopt a shell63 unit, and gives corresponding physical and mechanical parameters to materials of the structural unit. In this embodiment, after the corresponding model is obtained, the model is subjected to block processing, that is, the model is divided into a tunnel body, a surrounding rock body and a lining structure according to the actual structure of the engineering, and only the division is insufficient, and the deformation of the structures is actually expressed and displayed through a yield criterion, so that the model is more fit to reality, and meanwhile, when the structures are subjected to material selection, different structures are corresponding to different materials, that is, the materials are selected according to the actual materials of the corresponding structures, so that the authenticity and accuracy of the construction of the whole physical model are greatly improved, and accurate information is provided for the subsequent stability evaluation.
S32, according to preset model initial conditions and boundary conditions, carrying out model mesh division on the material constitutive model based on the principle that key parts are dense and outwards gradually sparse, and obtaining a corresponding construction physical model. In this embodiment, as shown in fig. 8, the model is generally constrained in three directions, i.e., X, Y, Z, which are horizontal fixed constraints applied to the left, right, front, and rear surfaces of the model, and vertical fixed constraints applied to the bottom surface of the model, and the upper surface of the model is a free surface.
S4, carrying out numerical simulation and analog calculation in the construction process of the small-clearance highway tunnel based on the construction geometric model and the construction physical model according to the design data information, the construction data information and the geological data information, and generating a corresponding calculation result; the numerical simulation calculation comprises calculation of stratum dead weight stress field and calculation of tunnel construction process; the resolving result comprises the maximum principal stress of the lining structure, the minimum principal stress of the lining structure, the horizontal displacement of the lining structure and the vertical displacement of the lining structure; in this embodiment, the lining structure needs to be passivated when resolving the gravity field of the stratum, and needs to be activated when resolving the tunnel construction process after the excavation is completed.
S5, comprehensively evaluating the stability of the construction process of the small-clear-distance highway tunnel based on the lining structure strength parameter and related standard rules according to the generated maximum main stress of the lining structure, the minimum main stress of the lining structure, the horizontal displacement of the lining structure and the vertical displacement of the lining structure, and generating a corresponding evaluation result. In this embodiment, after the solution is completed, the maximum principal stress and the minimum principal stress of the lining structure are analyzed according to the solution, so that the maximum compressive stress and the maximum tensile stress to which the lining structure is subjected can be obtained, and then it is determined whether the two stresses exceed the strength of the material corresponding to the lining structure, if so, this indicates that the stability of the tunnel construction engineering is relatively poor, and meanwhile, the displacement amounts in the vertical and horizontal directions of the lining structure are also analyzed, and the horizontal displacement amounts of the corresponding lining structure and the vertical displacement amount of the lining structure are compared with the standard specifications, so as to determine whether the corresponding lining structure meets the standard. The stability of the tunnel construction process is evaluated, the stability of the construction process of the small clear distance highway tunnel is judged under the double and comprehensive judgment of the stress field and the displacement field, the accuracy of the stability evaluation is greatly improved, and the maximum main stress and the minimum main stress of the lining structure, the horizontal displacement of the lining structure and the vertical displacement of the lining structure are shown in fig. 4, 5, 6 and 7.
The foregoing is merely exemplary of the present invention, and specific technical solutions and/or features that are well known in the art have not been described in detail herein. It should be noted that, for those skilled in the art, several variations and modifications can be made without departing from the technical solution of the present invention, and these should also be regarded as the protection scope of the present invention, which does not affect the effect of the implementation of the present invention and the practical applicability of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (3)
1. The method for evaluating the construction stability of the small-clearance highway tunnel in the complex geological environment is characterized by comprising the following steps of: the method comprises the following steps:
s1, acquiring engineering information of a corresponding small clear distance highway tunnel, wherein the engineering information comprises design information, construction information and geological information;
s2, building a construction geometric model of the small clear distance highway tunnel according to the acquired design data information, wherein the geometric model comprises a tunnel body, a surrounding rock body and a lining structure;
s3, building a construction physical model of the small clear distance highway tunnel based on a cutter-Prager yield criterion according to the construction geometric model and the acquired design information, construction information and geological information;
s4, carrying out numerical simulation and analog calculation in the construction process of the small-clearance highway tunnel based on the construction geometric model and the construction physical model according to the design data information, the construction data information and the geological data information, and generating a corresponding calculation result; the numerical simulation calculation comprises calculation of stratum dead weight stress field and calculation of tunnel construction process; the resolving result comprises the maximum principal stress of the lining structure, the minimum principal stress of the lining structure, the horizontal displacement of the lining structure and the vertical displacement of the lining structure;
s5, comprehensively evaluating the stability of the construction process of the small-clearance highway tunnel based on the lining structure strength parameter and standard rules according to the generated maximum main stress of the lining structure, the minimum main stress of the lining structure, the horizontal displacement of the lining structure and the vertical displacement of the lining structure, and generating a corresponding evaluation result;
the step S3 comprises the following steps:
s30, constructing a material constitutive model suitable for the small-clearance highway tunnel based on a Drucker-Prager yield criterion according to the acquired geological data information and the geometric model;
s31, selecting material units of the tunnel body, the surrounding rock body and the lining structure according to the material constitutive model, and endowing the material units with corresponding material physical and mechanical parameters;
s32, according to preset model initial conditions and boundary conditions, carrying out model mesh division on the material constitutive model based on the principle that key parts are dense and outwards gradually sparse, and obtaining a corresponding construction physical model.
2. The method for evaluating the construction stability of the small clear distance highway tunnel in the complex geological environment according to claim 1, which is characterized by comprising the following steps of: the Drucker-Prager yield criterion is:
in the middle ofIs the average stress; />Is a bias stress; />Is a material constant; />Is +.about.in Mises yield criterion>C is cohesive force,>is the internal friction angle.
3. The method for evaluating the construction stability of the small clear distance highway tunnel in the complex geological environment according to claim 2, which is characterized in that: when the self-gravity field of the stratum is calculated, the lining structure needs to be passivated, and when the tunnel construction process is calculated, the lining structure needs to be activated.
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| US20230031116A1 (en) * | 2022-09-27 | 2023-02-02 | Chengdu University Of Technology | Method of quantitative evaluation on structural disturbance characteristics of present in-situ geo-stress in deep shale gas reservoirs |
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| CN110195598A (en) * | 2019-06-14 | 2019-09-03 | 浙江交工路桥建设有限公司 | A kind of highway tunnel construction integrated control method |
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