Construction method for guaranteeing safety of underground penetrating pipeline of expressway

Abstract

The invention provides a construction method for guaranteeing safety of an underground pipeline of an expressway, and belongs to the technical field of construction safety. The method comprises the steps that 1, an underground construction site of a target road is surveyed, detailed construction information is obtained, and mechanical parameters of underground soil are obtained through a soil mechanical test; 2, constructing a geologic model according to the mechanical parameters of the soil in combination with detailed construction information; 3, a pipeline of a construction target is selected according to construction requirements, arrangement of the pipeline is simulated based on the geologic model, and a propelling strategy is generated; 4, construction is conducted based on the pipe jacking machine according to the propelling strategy, and the soil pressure risk is monitored and early warned; and 5, after construction is completed, the health degree of the construction pipeline is evaluated, and safety adjustment is conducted. And through accurate investigation, modeling and monitoring, the construction process is optimized, and safe and efficient construction and structural health of the pipeline are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of construction safety, and particularly relates to a construction method for ensuring the safety of underground pipelines under expressways. Background Art

[0002] At present, the construction of underground pipelines under expressways is a key link in traffic infrastructure construction, involving complex geological environments and construction technical challenges. With the acceleration of the urbanization process, the demand for underground pipelines has gradually increased. However, due to the large traffic flow and complex construction environment along expressways, the construction of underground crossing pipelines faces relatively high safety risks. Usually, less safety evaluation of the soil is carried out for underground pipelines, resulting in soil safety risks during the construction process, which has an adverse impact on pipeline construction, and even causes problems such as pipeline deformation and damage, threatening the structural safety of the road.

[0003] Therefore, the present invention proposes a construction method for ensuring the safety of underground pipelines under expressways. Summary of the Invention

[0004] The present invention provides a construction method for ensuring the safety of underground pipelines under expressways, which includes steps such as investigation, soil mechanics tests, geological model construction, etc., combines the propulsion strategy and the construction of the pipe jacking machine, monitors the soil pressure risk in real time to ensure the safety of pipeline construction, and evaluates the structural health after construction is completed and makes necessary safety adjustments.

[0005] On the one hand, the present invention provides a construction method for ensuring the safety of underground pipelines under expressways, including: Step 1: Investigate the underground construction site of the target highway to obtain detailed construction information, and obtain the mechanical parameters of the underground soil through soil mechanics tests; Step 2: Construct a geological model based on the mechanical parameters of the soil and the detailed construction information; Step 3: Select the pipeline for the construction target according to the construction requirements, simulate the layout of the pipeline based on the geological model, and generate a propulsion strategy; Step 4: Carry out construction based on the pipe jacking machine according to the propulsion strategy, monitor and give early warnings of soil pressure risks; Step 5: Evaluate the health of the constructed pipeline after construction is completed and make safety adjustments.

[0006] On the other hand, investigate the underground construction site of the target highway to obtain detailed construction information, including: Obtain the investigation scope of the underground construction site of the target highway, and carry out investigations based on underground detectors to obtain original investigation data; According to the original investigation data, prepare a detailed investigation report to generate the detailed construction information of the underground construction site of the target highway.

[0007] On the other hand, through soil mechanics tests, mechanical parameters of the underground soil are obtained, including: According to the construction details, determine the collection depth of the soil, divide it according to a preset gradient, and obtain multiple groups of soil samples after collection; Conduct a mechanical test on any one group of soil samples, and obtain the elastic modulus of the soil sample as: ; where represents the elastic modulus of the soil sample, represents the preset shear stress of the shear test, represents the shear strain, represents the Poisson's ratio of the soil sample; And obtain the consolidation coefficient and compression coefficient of the soil sample. The mechanical parameters of the soil include the elastic modulus, consolidation coefficient, and compression coefficient; Configure labels for each grouped soil sample, and the label content includes the soil collection depth and soil mechanical parameters.

[0008] On the other hand, construct a geological model according to the mechanical parameters of the soil combined with the construction details, including: According to the construction details of the underground construction site of the target highway, obtain a basic 3D model based on size division, and divide the basic 3D model into multiple minimum units according to the preset minimum unit size; For any one minimum unit, set the equilibrium equation: ; where represents the displacement vector of the minimum unit, represents the external load applied to the minimum unit, represents the preset displacement gradient matrix, represents the stiffness matrix constructed based on the mechanical parameters of the soil of the minimum unit, and V represents the volume of the minimum unit; Obtain the displacement magnitude and direction of all minimum units according to the equilibrium equation, and input them into the basic 3D model to obtain the geological model.

[0009] On the other hand, select the pipeline for the construction target according to the construction requirements. Before simulating the pipeline layout based on the geological model, including: According to the construction requirements, select the pipeline type as the construction target and obtain the basic pipeline information of the pipeline; Based on the geological model combined with the basic pipeline information, determine multiple possible installation paths of the pipeline and construct the objective function: ; where represents the optimal objective function, represents the installation cost of the i-th possible installation path, Indicates the indicator function. If the pipeline is installed at the i-th possible installation path, then , otherwise ; According to the mechanical parameters of the soil in the geological model and the actual geological conditions, generate constraint conditions, input the constraint conditions into the optimal objective function, and obtain a list of optimal installation paths.

[0010] On the other hand, based on the geological model, simulate the layout of the pipeline and generate a propulsion strategy, including: Determine the starting point and ending point of the pipeline installation according to the list of optimal installation paths; Generate a first propulsion strategy based on the installation path from the starting point of the pipeline installation to the first layout point; Generate a second propulsion strategy based on the installation paths between the first layout point and the second layout point, iterate the corresponding propulsion strategies for all installation paths in the list of optimal installation paths, and generate the final propulsion strategy of the pipeline.

[0011] On the other hand, according to the propulsion strategy, carry out construction based on the pipe jacking machine, monitor and give early warnings about the soil pressure risk, including: Based on the final propulsion strategy, the pipe jacking machine carries out construction. Based on the sensors of the pipe jacking machine, obtain the pipe jacking parameters during the pipe jacking process, and analyze the soil pressure risk degree at the current moment as: ; where represents the soil pressure risk degree at the j-th moment, [ ] represents the risk score function, represents the external force exerted by the pipe jacking machine at the j-th moment, represents the depth of the force application point of the pipe jacking machine at the j-th moment, represents the horizontal distance between the force application point and the soil at the j-th moment, ( ) represents the speed conversion function, represents the running speed of the pipe jacking machine at the j-th moment; If the soil pressure risk degree at the said moment is greater than the preset soil pressure risk threshold, it is determined that there is a soil pressure risk for the pipe jacking machine at the current moment, give an early warning and adjust the control parameters of the pipe jacking machine to reduce the soil pressure risk degree. Otherwise, continue to operate the pipe jacking machine.

[0012] On the other hand, after the construction is completed, evaluate the health degree of the constructed pipeline and carry out safety adjustments, including: Based on the final propulsion strategy, when the construction of the pipeline on any installation path is completed, evaluate the health degree of the pipeline on the said installation path based on the evaluation index as: ; where represents the preset propulsion force weight coefficient, represents the preset soil settlement weight coefficient, denotes the preset stress weight coefficient, denotes the soil - pipe friction force of the k - th pipe in the installation path, denotes the contact area of the k - th pipe in the installation path, denotes the soil load of the installation path, denotes the elastic modulus of the soil in the installation path, denotes the stress area of the soil and the pipe in the installation path; If the health degree of the pipeline in the installation path is less than the preset health threshold, it is determined that there is a safety risk in the pipeline of the installation path. Conduct a check and adjustment in combination with the pipeline according to the evaluation index. Otherwise, it indicates that the pipeline of the installation path complies with the safety specifications and continue the installation.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: The present invention provides a construction method for ensuring the safety of underground pipelines under highways, which is used to monitor the soil pressure risk in real time through steps such as investigation, soil mechanics test, geological model construction, etc., in combination with the propulsion strategy and the construction of the pipe - jacking machine to ensure the safety of pipeline construction, and evaluate the structural health after the construction is completed and make necessary safety adjustments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 is a schematic flow chart of a construction method for ensuring the safety of underground pipelines under highways provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will clearly and completely describe the technical solutions in the present invention in conjunction with the drawings in the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0017] Embodiment 1: As Figure 1 shown, a construction method for ensuring the safety of underground pipelines under highways provided by an embodiment of the present invention includes: Step 1: Conduct an investigation on the underground construction site of the target road to obtain detailed construction information, and through soil mechanics tests, obtain the mechanical parameters of the underground soil; Step 2: Construct a geological model based on the mechanical parameters of the soil combined with the detailed construction information; Step 3: Select the pipeline for the construction target according to the construction requirements, simulate the layout of the pipeline based on the geological model, and generate a propulsion strategy; Step 4: Carry out construction based on the pipe jacking machine according to the propulsion strategy, monitor and give early warnings of soil pressure risks; Step 5: Evaluate the health of the constructed pipeline after the construction is completed and make safety adjustments.

[0018] In this embodiment, the underground construction site of the target road refers to the specific area where underground pipeline construction is planned, which is the underground space under a highway or road.

[0019] In this embodiment, the detailed construction information refers to various specific parameters related to the underground construction project, including: construction location, construction depth, groundwater level, etc.

[0020] In this embodiment, the soil mechanics test is a process of experimentally testing the physical and mechanical properties of the soil, aiming to obtain the mechanical parameters of the soil and provide data support for engineering design.

[0021] In this embodiment, the mechanical parameters are quantitative indicators that describe the behavior and performance of soil and other materials under external loads, such as: elastic modulus, consolidation coefficient, permeability coefficient, etc.

[0022] In this embodiment, the geological model is a model constructed based on information such as the physical and mechanical properties of underground soil and rock formations, as well as groundwater conditions, combined with on-site investigation and experimental data, and is used to describe the underground environment.

[0023] In this embodiment, the construction requirements refer to a series of standard conditions set during the underground construction process to ensure the smooth progress of the project, meet the design standards and safety specifications, including: construction safety requirements, technical requirements, quality requirements, etc.

[0024] In this embodiment, the pipeline is a tubular structure used to transport fluids (such as water, natural gas, oil, sewage, etc.) or solid substances (such as coal, ore, etc.).

[0025] In this embodiment, the propulsion strategy refers to the plan and method of how to ensure the smooth propulsion of the pipeline and achieve the construction goal through reasonable planning and technical means during the underground construction process.

[0026] In this embodiment, the pipe jacking machine is a special equipment for underground pipeline construction, suitable for horizontal or inclined propulsion of tunnels or pipelines.

[0027] In this embodiment, the soil pressure risk refers to the risk that during underground construction, due to factors such as the properties of the soil, the groundwater level, the surrounding environment, and the construction method, the soil exerts excessive pressure on the construction equipment or the installed pipelines.

[0028] In this embodiment, safety adjustment refers to a series of corrective and optimization measures carried out on underground pipelines during construction, aiming to ensure the safety and stability of the pipelines, avoid potential risks, and guarantee the long-term reliable operation of the project.

[0029] In this embodiment, the health degree refers to the overall condition and safety performance evaluation of the constructed pipeline after completion.

[0030] The working principle and beneficial effects of the above technical solution are: by combining soil mechanics tests and geological models, optimizing pipeline layout and propulsion strategies, using pipe jacking machines for construction and monitoring soil pressure risks, ensuring construction safety and evaluating structural health, effectively improving construction efficiency and safety, and reducing risks.

[0031] Embodiment 2: Based on the above Embodiment 1, conduct an investigation on the underground construction site of the target highway to obtain detailed construction information, including: Obtain the investigation scope of the underground construction site of the target highway, and conduct an investigation based on underground detectors to obtain the original investigation data; According to the original investigation data, compile a detailed investigation report to generate the detailed construction information of the underground construction site of the target highway.

[0032] In this embodiment, the investigation scope refers to the specific area and depth range that needs to be investigated underground for the target highway before underground construction.

[0033] In this embodiment, the underground detector is a device used to detect and analyze underground conditions, including: seismic wave detectors, ground penetrating radars, resistivity detectors, etc.

[0034] In this embodiment, the original investigation data refers to the preliminary data obtained when investigating the underground construction site of the target highway through underground detectors (such as ground penetrating radars, resistivity detectors, seismic wave detectors, etc.).

[0035] In this embodiment, the investigation report is a report that summarizes, analyzes, and makes suggestions on the investigation work of the underground construction site of the target highway, including a detailed description of underground conditions, problems found during the investigation, risk assessment, and corresponding construction suggestions.

[0036] The working principle and beneficial effects of the above technical solution are: by using underground detectors to obtain raw survey data, compile detailed reports, and accurately obtain underground information at the construction site, it helps to provide a scientific basis, optimize the construction plan, ensure safety and effectiveness during the construction process, and reduce risks.

[0037] Embodiment 3: On the basis of the above-mentioned embodiment 1, the mechanical parameters of underground soil are obtained through soil mechanical test, including: According to the detailed construction information, the soil collection depth is determined and divided according to the preset step gradient to obtain multiple groups of soil samples; A mechanical test is performed on any group of soil samples to obtain the elastic modulus of the soil samples: ;in, represents the elastic modulus of the soil sample, represents the preset shear stress of the shear experiment, represents the shear strain, represents the Poisson's ratio of the soil sample; and obtaining the consolidation coefficient and compression coefficient of the soil sample, wherein the mechanical parameters of the soil include elastic modulus, consolidation coefficient and compression coefficient; A label is configured for each grouped soil sample, and the label content includes soil collection depth and soil mechanical parameters.

[0038] In this embodiment, the preset step gradient refers to the depth division interval set during the soil collection and testing process to ensure sufficient analysis of soil layers at different depths. In this embodiment, the multiple groups of soil samples refer to soil samples collected at different depths and different locations according to a preset sampling plan.

[0039] In this embodiment, the elastic modulus describes the degree of deformation of the material under the action of an external force, and reflects the ability of the material to resist elastic deformation during the deformation process.

[0040] In this embodiment, the preset shear stress refers to the shear force applied to the soil sample in advance during the shear test.

[0041] In this embodiment, shear strain is a measure that describes the degree to which soil or other materials deform under the action of shear forces.

[0042] In this embodiment, Poisson's ratio is a physical quantity that describes the degree of deformation of a material in a direction perpendicular to the applied force when the material is subjected to a force.

[0043] In this embodiment, the consolidation coefficient reflects the ability of soil to discharge water and compress pores when subjected to external loads, and is defined as the vertical deformation rate of soil under a specific pressure per unit time.

[0044] In this embodiment, the compression coefficient is used to describe the degree of volume change of the soil during consolidation, reflecting the compression capacity of the soil under pressure.

[0045] The working principle and beneficial effects of the above technical solution are as follows: By collecting soil samples at a preset depth and conducting mechanical tests, mechanical parameters such as the elastic modulus, consolidation coefficient, and compression coefficient of the soil are obtained. Tags are configured for each group of samples to provide accurate soil mechanical data, which helps to optimize the construction design and ensure safety.

[0046] Embodiment 4: Based on the above Embodiment 1, a geological model is constructed according to the mechanical parameters of the soil in combination with the construction details, including: According to the construction details of the underground construction site of the target highway, a basic three-dimensional model is obtained based on size division, and the basic three-dimensional model is divided into multiple minimum units according to a preset minimum unit size; For any minimum unit, an equilibrium equation is set: ; where, represents the displacement vector of the minimum unit, represents the external load applied to the minimum unit, represents a preset displacement gradient matrix, represents the stiffness matrix constructed based on the mechanical parameters of the soil of the minimum unit, and V represents the volume of the minimum unit; According to the equilibrium equation, the displacement magnitudes and directions of all minimum units are obtained, and the geological model is obtained by inputting into the basic three-dimensional model.

[0047] In this embodiment, the construction details refer to all specific contents related to the construction during the underground construction process, such as geological conditions, soil properties, spatial dimensions and shapes of the construction area, etc.

[0048] In this embodiment, the basic three-dimensional model refers to a three-dimensional space model obtained by comprehensively modeling the dimensions of the target underground construction area, soil characteristics, and basic structure design requirements.

[0049] In this embodiment, the preset minimum unit size refers to the spatial size of each unit when dividing the basic three-dimensional model or geological model into calculation units.

[0050] In this embodiment, the minimum unit is used to represent the smallest calculation unit of a soil structure.

[0051] In this embodiment, the external load is the force acting on the minimum unit in the basic three-dimensional model of the underground construction site.

[0052] In this embodiment, the preset displacement gradient matrix is a matrix that describes the rate of displacement change and represents the change trend of the displacement field within a minimum unit.

[0053] In this embodiment, the stiffness matrix describes the rigidity of the minimum unit and is composed of the soil mechanical parameters of the minimum unit.

[0054] The working principle and beneficial effects of the above technical solution are as follows: By dividing the basic three-dimensional model into minimum units, setting up the equilibrium equation, combining the soil mechanical parameters and external loads, calculating the displacement of each unit, an accurate geological model can be obtained, which helps to optimize the construction design and improve the foundation stability.

[0055] Embodiment 5: Based on the above Embodiment 1, select the pipeline of the construction target according to the construction requirements. Before simulating the pipeline layout based on the geological model, it includes: According to the construction requirements, select the pipeline type as the construction target and obtain the basic pipeline information of the pipeline; Based on the geological model and combined with the basic pipeline information, determine multiple possible installation paths of the pipeline, and construct the objective function: ; where represents the optimal objective function, represents the installation cost of the i-th possible installation path, represents the indicator function. If the pipeline is installed on the i-th possible installation path, then otherwise ; According to the mechanical parameters of the soil in the geological model and the actual geological conditions, generate constraint conditions, and input the constraint conditions into the optimal objective function to obtain a list of optimal installation paths.

[0056] In this embodiment, the pipeline types include: steel pipes, PE pipes, polyvinyl chloride pipes, etc.

[0057] In this embodiment, the basic pipeline information refers to the key data related to the physical, mechanical, and chemical properties of the pipeline, such as: corrosion resistance of the pipeline, installation methods and processes, fluid properties, etc.

[0058] In this embodiment, the possible installation paths refer to multiple alternative pipeline laying paths planned based on factors such as geological conditions, construction requirements, and pipeline characteristics according to the objective function.

[0059] In this embodiment, the objective function is a function that optimizes the cost of the pipeline installation path and ensures that the installation process meets the geological and construction requirements.

[0060] In this embodiment, the indicator function is used to represent whether a certain condition is met, and the selection of an event is expressed by a binary value (0 or 1).

[0061] In this embodiment, the actual geological conditions refer to the geological environmental characteristics in a specific construction area, such as soil classification, groundwater, and soil bearing capacity.

[0062] In this embodiment, the list of optimal installation paths is a set of path selections calculated by an optimization model. These paths are the optimal choices that can achieve pipeline installation with the lowest installation cost under the premise of meeting all constraint conditions.

[0063] The working principle and beneficial effects of the above technical solution are as follows: By combining the geological model and the basic pipeline information, multiple installation paths are determined. Through constructing an optimal objective function and setting limiting constraint conditions, the pipeline installation path is optimized to ensure the minimization of construction costs and adaptation to the actual geological environment, thereby improving construction efficiency and safety.

[0064] Embodiment 6: Based on the above Embodiment 5, simulate the pipeline layout based on the geological model to generate a propulsion strategy, including: Determine the starting point and ending point of the pipeline installation according to the list of optimal installation paths; Generate a first propulsion strategy based on the installation path from the starting point of the pipeline installation to the first layout point; Generate a second propulsion strategy based on the installation path between the first layout point and the second layout point, and iterate the corresponding propulsion strategies for all installation paths in the list of optimal installation paths to generate the final propulsion strategy for the pipeline.

[0065] In this embodiment, the first layout point refers to the starting position where special measures or strategies need to be taken for control, adjustment, or optimization during the pipeline installation process.

[0066] In this embodiment, the installation path refers to the specific route between the starting point and the ending point of the pipeline.

[0067] In this embodiment, the first propulsion strategy is a specific installation plan formulated based on the specific path between the starting point of the pipeline installation and the first layout point, in combination with the terrain, environment, and construction conditions of this path.

[0068] In this embodiment, the second layout point is the second key position or inspection point planned during the pipeline installation process.

[0069] In this embodiment, the second propulsion strategy is an installation strategy formulated based on the pipeline installation path from the first layout point to the second layout point.

[0070] In this embodiment, the final propulsion strategy is an overall solution that combines the propulsion strategies for each section of the pipeline path from the starting point to the ending point of the pipeline installation.

[0071] The working principle and beneficial effects of the above technical solution are as follows: By determining the starting point and ending point of the pipeline installation, combining with the optimal installation path to generate a propulsion strategy, and gradually iteratively optimizing the installation path, it ensures the high efficiency and accuracy of the pipeline installation process, improves the construction speed and quality, and reduces the possible risks during the construction process.

[0072] Embodiment 7: Based on the above Embodiment 1, construction is carried out using a pipe jacking machine according to the propulsion strategy, and the soil pressure risk is monitored and warned, including: Based on the final propulsion strategy, the pipe jacking machine conducts construction. Based on the sensors of the pipe jacking machine, the pipe jacking parameters during the pipe jacking process are obtained, and the soil pressure risk degree at the current moment is analyzed based on the pipe jacking parameters as: ; where represents the soil pressure risk degree at the j-th moment, [ ] represents the risk score function, represents the external force exerted by the pipe jacking machine at the j-th moment, represents the depth of the force application point of the pipe jacking machine at the j-th moment, represents the horizontal distance between the force application point and the soil at the j-th moment, ( ) represents the speed conversion function, represents the operating speed of the pipe jacking machine at the j-th moment; If the soil pressure risk degree at the said moment is greater than the preset soil pressure risk threshold, it is determined that there is a soil pressure risk for the pipe jacking machine at the current moment, and a warning is given and the control parameters of the pipe jacking machine are adjusted to reduce the soil pressure risk degree. Otherwise, the pipe jacking machine continues to operate.

[0073] In this embodiment, the pipe jacking parameters refer to various physical quantities and engineering data related to the pipe jacking machine during the working process, such as: the external force applied, the depth of the force application point, the horizontal distance between the force application point and the soil, etc.

[0074] In this embodiment, the soil pressure risk degree is an index representing the quantification of the soil pressure during the construction of the pipe jacking machine.

[0075] In this embodiment, the risk score function is a mathematical function used to quantify and evaluate the soil pressure risk.

[0076] In this embodiment, the speed conversion function is a function used to convert the relationship between the operating speed of the pipe jacking machine and the soil pressure risk degree.

[0077] In this embodiment, the preset soil pressure risk threshold is a key parameter used to determine whether the soil pressure during the construction of the pipe jacking machine exceeds the safe range.

[0078] In this embodiment, the pipe jacking machine control parameters refer to the parameters that can be adjusted during the construction process, including: thrust force, propulsion speed, depth of the force application point, etc.

[0079] The working principle and beneficial effects of the above technical solution are as follows: By real-time monitoring of the construction parameters of the pipe jacking machine, calculating the soil pressure risk level, conducting risk early warning and automatically adjusting the control parameters, the soil pressure risk is reduced, ensuring the safety and efficiency of the construction process, reducing accidents, and improving the construction quality and safety.

[0080] Embodiment 8: Based on the above Embodiment 6, after the construction is completed, evaluate the health of the constructed pipeline and perform safety adjustments, including: Based on the final propulsion strategy, when the construction of the pipeline on any installation path is completed, evaluate the health of the pipeline on the installation path based on the evaluation index as: ; where represents the preset thrust force weight coefficient, represents the preset soil settlement weight coefficient, represents the preset stress weight coefficient, represents the soil-pipeline friction force of the k-th pipeline in the installation path, represents the contact area of the k-th pipeline in the installation path, represents the soil load of the installation path, represents the elastic modulus of the soil in the installation path, represents the stress area of the soil and the pipeline in the installation path; If the health of the pipeline on the installation path is less than the preset health threshold, it is determined that there is a safety risk for the pipeline on the installation path, and a check and adjustment are carried out in combination with the pipeline according to the evaluation index. Otherwise, it means that the pipeline on the installation path complies with the safety specifications, and the installation continues.

[0081] In this embodiment, the evaluation index is an index used to measure the health of the pipeline in the installation path, including: soil-pipeline friction force, soil elastic modulus, contact area, etc.

[0082] In this embodiment, the preset thrust force weight coefficient represents the relative importance of the thrust force in the evaluation process.

[0083] In this embodiment, the preset soil settlement weight coefficient represents the relative importance of soil settlement in the pipeline health assessment.

[0084] In this embodiment, the preset stress weight coefficient is a relative importance parameter for measuring the influence of stress on the pipeline health.

[0085] In this embodiment, the preset health threshold represents the lower limit for the safe operation of the pipeline under various influencing factors (such as stress, soil settlement, friction, etc.).

[0086] The working principle and beneficial effects of the above technical solution are as follows: By evaluating indicators such as the propulsion force, soil settlement, and stress of the pipeline, calculating the health of the pipeline, judging the safety risks in real time and making adjustments, it is ensured that the pipeline installation meets the safety standards, optimizing the construction process, improving the construction quality, and ensuring the construction safety.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A construction method for ensuring the safety of underground pipelines on expressways, characterized in that: include: Step 1: Survey the underground construction site of the target highway to obtain detailed construction information and obtain the mechanical parameters of the underground soil through soil mechanics tests; Step 2: Construct a geological model based on the mechanical parameters of the soil combined with detailed construction information; Step 3: Select the pipeline of the construction target according to the construction requirements, simulate the layout of the pipeline based on the geological model, and generate the advancement strategy; Step 4: Carry out construction based on the pipe jacking machine according to the advancement strategy, monitor and warn of soil pressure risks; Step 5: After construction is completed, evaluate the health of the construction pipeline and make safety adjustments.

2. A construction method for ensuring the safety of underground pipelines on expressways according to claim 1, characterized in that: Conduct a survey of the underground construction site of the target highway to obtain detailed construction information, including: Obtain the survey scope of the underground construction site of the target highway, and conduct survey based on the underground detector to obtain the original survey data; Based on the original survey data, a detailed survey report is compiled to generate detailed construction information for the underground construction site of the target highway.

3. A construction method for ensuring the safety of underground pipelines on expressways according to claim 1, characterized in that: Through soil mechanics tests, the mechanical parameters of underground soil are obtained, including: According to the detailed construction information, the soil collection depth is determined and divided according to the preset step gradient to obtain multiple groups of soil samples; A mechanical test is performed on any group of soil samples to obtain the elastic modulus of the soil samples: ;in, represents the elastic modulus of the soil sample, represents the preset shear stress of the shear experiment, represents the shear strain, represents the Poisson's ratio of the soil sample; and obtaining the consolidation coefficient and compression coefficient of the soil sample, wherein the mechanical parameters of the soil include elastic modulus, consolidation coefficient and compression coefficient; A label is configured for each grouped soil sample, and the label content includes soil collection depth and soil mechanical parameters.

4. A construction method for ensuring the safety of underground pipelines on expressways according to claim 1, characterized in that: The geological model is constructed based on the mechanical parameters of the soil combined with construction details, including: According to the detailed construction information of the underground construction site of the target highway, a basic three-dimensional model is obtained based on size division, and the basic three-dimensional model is divided into a plurality of minimum units according to a preset minimum unit size; For any minimum unit, set the equilibrium equation: ;in, represents the displacement vector of the minimum unit, represents the external load applied to the smallest element, represents the preset displacement gradient matrix, represents a stiffness matrix constructed based on the mechanical parameters of the minimum unit soil, and V represents the volume of the minimum unit; The displacement size and direction of all minimum units are obtained according to the equilibrium equation, and the geological model is obtained by inputting the basic three-dimensional model.

5. A construction method for ensuring the safety of underground pipelines on expressways according to claim 1, characterized in that: Select the pipeline of the construction target according to the construction requirements, and simulate the layout of the pipeline based on the geological model, including: According to the construction requirements, select the pipeline type as the construction target and obtain the basic pipeline information of the pipeline; Based on the geological model and basic pipeline information, multiple possible installation paths of the pipeline are determined and the objective function is constructed: ;in, represents the optimal objective function, represents the installation cost of the i-th possible installation path, represents the indicator function. If the i-th possible installation path installs the pipeline, then ,otherwise ; According to the mechanical parameters of the soil in the geological model and the actual geological conditions, the constraint conditions are generated, and the constraint conditions are input into the optimal objective function to obtain the optimal installation path list.

6. A construction method for ensuring the safety of underground pipelines on expressways according to claim 5, characterized in that: Based on the geological model, the pipeline layout is simulated and the advancement strategy is generated, including: Determine the installation starting point and end point of the pipeline according to the optimal installation path list; Generate a first advancement strategy based on an installation path from a pipeline installation starting point to a first arrangement point; Based on the installation paths of the first arrangement point and the second arrangement point, a second advancement strategy is generated, and corresponding advancement strategies of all installation paths in the optimal installation path list are iterated to generate a final advancement strategy for the pipeline.

7. A construction method for ensuring the safety of underground pipelines on expressways according to claim 1, characterized in that: Based on the advancement strategy, construction is carried out based on the pipe jacking machine, monitoring and warning of soil pressure risks, including: Based on the final advancement strategy, the pipe jacking machine is used for construction. The pipe jacking parameters in the pipe jacking process are obtained based on the pipe jacking machine sensor. The soil pressure risk at the current moment is analyzed based on the pipe jacking parameters: ;in, represents the soil pressure risk at time j, [ ] represents the risk score function, It means that the pipe jacking machine applies external force at time j. It indicates the depth of the force application point of the pipe jacking machine at time j. represents the horizontal distance between the force application point and the soil at time j, ( ) represents the speed conversion function, Indicates the running speed of the pipe jacking machine at time j; If the soil pressure risk at the moment is greater than the preset soil pressure risk threshold, it is determined that the pipe jacking machine has a soil pressure risk at the current moment, an early warning is issued and the control parameters of the pipe jacking machine are adjusted to reduce the soil pressure risk; otherwise, the pipe jacking machine continues to operate.

8. A construction method for ensuring the safety of underground pipelines on expressways according to claim 6, characterized in that: After construction is completed, the health of the construction pipeline is evaluated and safety adjustments are made, including: Based on the final advancement strategy, when the pipeline construction of any installation path is completed, the health of the pipeline of the installation path is evaluated based on the evaluation index as follows: ;in, represents the preset propulsion force weight coefficient, Represents the preset soil settlement weight coefficient, represents the preset stress weight coefficient, represents the soil-pipe friction of the kth pipeline in the installation path, represents the contact area of ​​the kth pipe in the installation path, represents the soil load of the installation path, represents the elastic modulus of the soil in the installation path, Indicates the stress-bearing area of ​​the soil and the pipeline in the installation path; If the health level of the installation path pipeline is less than the preset health threshold, it is determined that there is a safety risk in the installation path pipeline, and adjustments are made to the pipeline based on the evaluation indicators. Otherwise, it means that the installation path pipeline meets the safety regulations and installation continues.

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