Construction determination method and device for pipe jacking underneath passing expressway

Abstract

The invention provides a construction determination method and device for a pipe-jacking underneath passing expressway, and belongs to the technical field of pipe-jacking construction. The method is used for a to-be-constructed area, the to-be-constructed area is provided with an expressway, and the method comprises the steps that geological parameters of the to-be-constructed area are obtained, a corrected Mohr-Coulomb constitutive model of the to-be-constructed area is obtained based on general rock-soil finite element calculation software and the geological parameters, and a plurality of pipe jacking parameter sets are taken; the multiple pipe jacking parameter sets are input into the corrected Mohr-Coulomb constitutive model, and influence parameters of the to-be-constructed area corresponding to each pipe jacking parameter set in the multiple pipe jacking parameter sets are obtained, and on the basis of the influence parameters of the to-be-constructed areas corresponding to the multiple pipe jacking parameter sets, the to-be-constructed area corresponding to the multiple pipe jacking parameter sets is obtained; and determining a target pipe jacking parameter set including the target thickness, the target diameter and the target strength of the pipe jacking. The accuracy of the obtained target thickness, the target diameter and the target strength of the jacking pipe is improved, and the effect of improving the accuracy of the method is achieved.

Description

Technical Field

[0001] This application relates to the technical field of pipe jacking construction, and particularly relates to a construction determination method and device for pipe jacking under a highway. Background Art

[0002] Pipe jacking construction is an important trenchless pipeline laying technology in water conservancy projects. Through this technology, pipelines for functions such as water conveyance, drainage, irrigation, and flood control can be laid. Among them, the construction determination method for pipe jacking under a highway is used to determine some parameters of the pipe jacking in pipe jacking construction.

[0003] In a current construction determination method for pipe jacking under a highway, first, some parameters of the construction area to be constructed are obtained, and based on these parameters and some related formulas, parameters such as the diameter, thickness, and strength of the pipe jacking are calculated. Then, the pipe jacking construction can be carried out with these parameters.

[0004] However, it may be difficult to consider the complex conditions in the construction area in the above method, and the accuracy of the calculated parameters of the pipe jacking is poor, resulting in low accuracy of the above method. Summary of the Invention

[0005] Embodiments of this application provide a construction determination method and device for pipe jacking under a highway, which can solve the problem of low accuracy in related technologies. The technical solution is as follows: According to the first aspect of this application, a construction determination method for pipe jacking under a highway is provided for a construction area to be constructed, where the construction area to be constructed has a highway. The method includes: Obtain the geological parameters of the construction area to be constructed. In the geological parameters, the construction area to be constructed includes a gravel layer, a silty clay layer, and a gravel layer arranged in sequence from the surface downwards. The highway is located on the gravel layer, and the width of the highway is 28 meters; Based on the general geotechnical finite element calculation software and the geological parameters, obtain the modified Mohr-Coulomb constitutive model of the construction area to be constructed. In the modified Mohr-Coulomb constitutive model, the soil body is formed by tetrahedral solid element structures, the pipe jacking is a two-dimensional shell element, and the bottom of the modified Mohr-Coulomb constitutive model adopts a fixed constraint, and the side adopts a fixed normal displacement constraint; Obtain multiple sets of pipe jacking parameters, and input the multiple sets of pipe jacking parameters into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of the area to be constructed corresponding to each set of pipe jacking parameters in the multiple sets of pipe jacking parameters. The influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when pipe jacking construction is carried out based on the set of pipe jacking parameters. Each set of pipe jacking parameters includes three parameters: the thickness, diameter, and strength of the pipe jacking, and one of the three parameters in any two sets of pipe jacking parameters is different; Determine a target set of pipe jacking parameters including the target thickness, target diameter, and target strength of the pipe jacking based on the influence parameters of the multiple areas to be constructed corresponding to the multiple sets of pipe jacking parameters.

[0006] Optionally, the top is a free surface, the length of the pipe jacking is 8 meters. When the modified Mohr-Coulomb constitutive model simulates the construction of the pipe jacking, the construction conditions of the pipe jacking include twelve conditions: initial stress field analysis, installing the pipe jacking, the first pipe jacking, and the second to the tenth pipe jacking. Before obtaining the multiple sets of pipe jacking parameters and inputting the multiple sets of pipe jacking parameters into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of the area to be constructed corresponding to each set of pipe jacking parameters in the multiple sets of pipe jacking parameters, the method further includes: Input an initial set of pipe jacking parameters into the modified Mohr-Coulomb constitutive model to simulate the construction of the pipe jacking, and obtain the first influence parameter of each of the twelve conditions during the construction of the pipe jacking. The first influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when pipe jacking construction is carried out based on the initial set of pipe jacking parameters; Determine multiple target conditions among the first influence parameters of the twelve conditions where the first influence parameter is greater than a preset influence parameter threshold; The obtaining of multiple sets of pipe jacking parameters, inputting the multiple sets of pipe jacking parameters into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of the area to be constructed corresponding to each set of pipe jacking parameters in the multiple sets of pipe jacking parameters includes: Obtain multiple sets of pipe jacking parameters, and input the multiple sets of pipe jacking parameters into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of the area to be constructed corresponding to each set of pipe jacking parameters in the multiple sets of pipe jacking parameters under each of the multiple target conditions.

[0007] Optionally, the obtaining of multiple sets of pipe jacking parameters, inputting the multiple sets of pipe jacking parameters into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of the area to be constructed corresponding to each set of pipe jacking parameters in the multiple sets of pipe jacking parameters under each of the multiple target conditions includes: Obtain 5 groups of first pipe-jacking parameters. Any one of the first pipe-jacking parameter groups includes the thickness, diameter, and strength of the pipe-jacking, and the parameters other than the thickness of the pipe-jacking in the 5 groups of first pipe-jacking parameters are the same; Input the 5 groups of first pipe-jacking parameters into the modified Mohr-Coulomb constitutive model respectively, and obtain the thickness influence parameters of the 5 groups of first pipe-jacking parameters in the multiple target working conditions. The thickness influence parameter is the ratio of the size of the settlement area to the diameter of the pipe-jacking when pipe-jacking construction is carried out based on the first pipe-jacking parameter group; Determining the target pipe-jacking parameter group including the target thickness, target diameter, and target strength of the pipe-jacking based on the influence parameters of the multiple pipe-jacking parameter groups corresponding to the multiple areas to be constructed includes: Determine the thickness of the pipe-jacking in the first pipe-jacking parameter group with the smallest thickness influence parameter among the 5 groups of first pipe-jacking parameters in the multiple target working conditions as the target thickness of the pipe-jacking.

[0008] Optionally, in the 5 groups of first pipe-jacking parameters, the thicknesses of the pipe-jacking are 0.6B0, 0.8B0, 1.0B0, 1.2B0, and 1.40B0 respectively, and B0 is the thickness of the pipe-jacking in the initial pipe-jacking parameter group.

[0009] Optionally, obtaining multiple groups of pipe-jacking parameters and inputting the multiple groups of pipe-jacking parameters into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of each target working condition in the multiple target working conditions of the area to be constructed corresponding to each group of pipe-jacking parameters includes: Obtain 5 groups of second pipe-jacking parameters. Any one of the second pipe-jacking parameter groups includes the thickness, diameter, and strength of the pipe-jacking, and the parameters other than the diameter of the pipe-jacking in the 5 groups of second pipe-jacking parameters are the same; Input the 5 groups of second pipe-jacking parameters into the modified Mohr-Coulomb constitutive model respectively, and obtain the diameter influence parameters of the 5 groups of second pipe-jacking parameters in the multiple target working conditions. The diameter influence parameter is the ratio of the size of the settlement area to the diameter of the pipe-jacking when pipe-jacking construction is carried out based on the second pipe-jacking parameter group; Determining the target pipe-jacking parameter group including the target thickness, target diameter, and target strength of the pipe-jacking based on the influence parameters of the multiple pipe-jacking parameter groups corresponding to the multiple areas to be constructed includes: Determine the diameter of the pipe-jacking in the second pipe-jacking parameter group with the smallest diameter influence parameter among the 5 groups of second pipe-jacking parameters in the multiple target working conditions as the target diameter of the pipe-jacking.

[0010] Optionally, among the 5 groups of second pipe jacking parameters, the pipe jacking diameters are 0.5D0, 0.75D0, 1.0D0, 1.2D0, and 1.50D0 respectively, where D0 is the diameter of the pipe jacking in the initial pipe jacking parameter group.

[0011] Optionally, the method of obtaining multiple groups of pipe jacking parameters and inputting the multiple groups of pipe jacking parameters into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of each group of pipe jacking parameters in the multiple target working conditions for the to-be-constructed area corresponding to each group of pipe jacking parameters includes: Obtain 5 groups of third pipe jacking parameters. Any one of the third pipe jacking parameter groups includes the thickness, diameter, and strength of the pipe jacking, and the parameters except the strength of the pipe jacking in the 5 groups of third pipe jacking parameter groups are the same; Input the 5 groups of third pipe jacking parameters into the modified Mohr-Coulomb constitutive model respectively to obtain the strength influence parameters of the 5 groups of third pipe jacking parameters in the multiple target working conditions. The strength influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when pipe jacking construction is carried out based on the third pipe jacking parameter group; Determining the target pipe jacking parameter group including the target thickness, target diameter, and target strength of the pipe jacking based on the influence parameters of the multiple to-be-constructed areas corresponding to the multiple groups of pipe jacking parameters includes: Determine the strength of the pipe jacking in the third pipe jacking parameter group with the smallest strength influence parameter among the 5 groups of third pipe jacking parameters in the multiple target working conditions as the target strength of the pipe jacking.

[0012] Optionally, among the 5 groups of third pipe jacking parameters, the strengths of the pipe jacking are 0.6E0, 0.8E0, 1.0E0, 1.2E0, and 1.40E0 respectively, where E0 is the strength of the pipe jacking in the initial pipe jacking parameter group.

[0013] Optionally, in the modified Mohr-Coulomb constitutive model of the to-be-constructed area, the pipe jacking includes a pipe jacking sleeve and a pipe jacking segment. Both the pipe jacking sleeve and the pipe jacking segment are shell elements. The unit weight of the pipe jacking sleeve is 78 kN / m³, the elastic modulus is 210 MPa, the Poisson's ratio is 0.20, and the thickness is 0.02 m. The unit weight of the pipe jacking segment is 25 kN / m³, the elastic modulus is 30 MPa, the Poisson's ratio is 0.25, and the thickness is 0.275; The size of the modified Mohr-Coulomb constitutive model of the to-be-constructed area in the first direction is 80 meters, in the second direction is 40 meters, and the height is 40 meters. The first direction is perpendicular to the length direction of the highway and parallel to the horizontal plane, and the second direction is perpendicular to the first direction and parallel to the horizontal plane. The modified Mohr-Coulomb constitutive model of the to-be-constructed area includes 140,785 units and 25,508 nodes. By setting the interface unit with a strength reduction coefficient of 0.7 between the rock and soil masses, the coupling effect between the concrete of the pipe jacking and the surrounding rock and soil masses is simulated, and the shrinkage rate of the pipe sections of the pipe jacking is set to simulate the soil loss during pipe jacking construction.

[0014] On the other hand, a construction determination device for pipe jacking under a highway is provided for the to-be-constructed area, where the to-be-constructed area has a highway. The construction determination device for pipe jacking under a highway includes: A parameter acquisition module, configured to acquire the geological parameters of the to-be-constructed area. Among the geological parameters, the to-be-constructed area includes a gravel layer, a silty clay layer, and a gravel layer arranged successively downward along the ground surface. The highway is located on the gravel layer, and the width of the highway is 28 meters. A model determination module, configured to obtain the modified Mohr-Coulomb constitutive model of the to-be-constructed area based on general geotechnical finite element calculation software and the geological parameters. In the modified Mohr-Coulomb constitutive model, the soil body is formed by tetrahedral solid element structures, and the pipe jacking is a two-dimensional shell element. The bottom of the modified Mohr-Coulomb constitutive model is fixed by constraints, and the side is fixed by normal displacement constraints. A pipe jacking parameter acquisition module, configured to acquire multiple groups of pipe jacking parameters, and input the multiple groups of pipe jacking parameters into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of the to-be-constructed area corresponding to each group of pipe jacking parameters. The influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when pipe jacking construction is carried out based on the group of pipe jacking parameters. Each group of pipe jacking parameters includes three parameters: the thickness, diameter, and strength of the pipe jacking, and one parameter among the three parameters of any two groups of pipe jacking parameters is different. A target parameter determination module, configured to determine a target pipe jacking parameter group including the target thickness, target diameter, and target strength of the pipe jacking based on the influence parameters of the to-be-constructed area corresponding to the multiple groups of pipe jacking parameters.

[0015] The beneficial effects brought by the technical solution provided by the embodiments of the present application at least include: Using general geotechnical finite element calculation software and geological parameters, a modified Mohr-Coulomb constitutive model for the area to be constructed is obtained. Then, multiple groups of pipe jacking parameters are respectively input into the modified Mohr-Coulomb constitutive model to obtain the influence parameters of the area to be constructed corresponding to each group of pipe jacking parameters in the multiple groups of pipe jacking parameters. After that, based on the influence parameters of the multiple areas to be constructed corresponding to the multiple groups of pipe jacking parameters, a target group of pipe jacking parameters including the target thickness, target diameter, and target strength of the pipe jacking can be determined. In this way, the complex conditions of the area to be constructed can be simulated with high precision through the modified Mohr-Coulomb constitutive model, so as to improve the accuracy of the obtained target thickness, target diameter, and target strength of the pipe jacking, achieving the effect of improving the accuracy of this method. Brief Description of the Drawings

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a flowchart of a method for determining the construction of a pipe jacking under a highway provided by an embodiment of the present application; Figure 2 It is a flowchart of another method for determining the construction of a pipe jacking under a highway provided by an embodiment of the present application; Figure 3 It is a schematic diagram of a modified Mohr-Coulomb constitutive model provided by an embodiment of the present application; Figure 4 It is a cross-sectional model diagram of the disturbance deformation of a pipe jacking provided by an embodiment of the present application; Figure 5 It is a vertical deformation nephogram provided by an embodiment of the present application; Figure 6 It is a curve graph of the variation law of ground settlement provided by an embodiment of the present application; Figure 7 It is a curve graph of the disturbance law of ground settlement provided by an embodiment of the present application; Figure 8 It is a curve graph of the influence of the pipe jacking thickness on the ground settlement disturbance provided by an embodiment of the present application; Figure 9 It is a curve graph of the influence of the pipe jacking diameter on the ground settlement disturbance provided by an embodiment of the present application; Figure 10 It is a curve graph of the influence of the pipe jacking strength on the ground settlement disturbance provided by an embodiment of the present application; Figure 11It is a block diagram of a construction determination device for a pipe jacking under a highway provided by an embodiment of the present application.

[0018] Through the above-mentioned drawings, specific embodiments of the present application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. Specific Embodiments

[0019] To make the objectives, technical solutions, and advantages of the present application clearer, the embodiments of the present application will be further described in detail below in conjunction with the drawings.

[0020] One of the core tasks of water conservancy projects is water conveyance, drainage, irrigation, and flood control. This necessarily involves the laying of a large number of pipelines. In water conservancy projects, water conservancy pipelines often need to cross obstacles such as highways, railways, and densely built-up areas. Pipe jacking can lay pipelines under these obstacles with little or no excavation, avoiding damage and interruption to existing facilities (such as interrupting highway traffic), and greatly reducing engineering risks and costs.

[0021] The construction determination method for pipe jacking under a highway provided by an embodiment of the present application can be used in the pipeline laying construction of water conservancy projects to determine a target pipe jacking parameter set including the target thickness, target diameter, and target strength of the pipe jacking, so as to improve the accuracy of the parameters of these pipe jackings obtained.

[0022] Figure 1 It is a method flowchart of a construction determination method for pipe jacking under a highway provided by an embodiment of the present application, which is used for a construction area to be constructed. The construction area to be constructed has a highway. The method includes: Step 101: Obtain the geological parameters of the construction area to be constructed. Among the geological parameters, the construction area to be constructed includes a gravel layer, a silty clay layer, and a gravel layer arranged in sequence from the surface downwards. The highway is located on the gravel layer, and the width of the highway is 28 meters.

[0023] Step 102: Based on the general geotechnical finite element calculation software and the geological parameters, obtain the modified Mohr-Coulomb constitutive model of the construction area to be constructed. In the modified Mohr-Coulomb constitutive model, the soil body is formed by tetrahedral solid element structures, the pipe jacking is a two-dimensional shell element, the bottom of the modified Mohr-Coulomb constitutive model is subjected to fixed constraints, and the side is subjected to fixed normal displacement constraints.

[0024] Among them, the top of the model is a free surface, the length of the pipe jacking is 8 meters. When the modified Mohr-Coulomb constitutive model simulates the construction of the pipe jacking, the construction conditions of the pipe jacking include twelve conditions such as initial stress field analysis, installation of the pipe jacking, the first pipe jacking, and the second to tenth pipe jackings.

[0025] Step 103: Obtain multiple pipe jacking parameter sets, and input the multiple pipe jacking parameter sets into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of the area to be constructed corresponding to each pipe jacking parameter set in the multiple pipe jacking parameter sets. The influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when pipe jacking construction is carried out based on the pipe jacking parameter set. Each pipe jacking parameter set includes three parameters: the thickness, diameter, and strength of the pipe jacking, and one of the three parameters in any two pipe jacking parameter sets is different.

[0026] Step 104: Determine a target pipe jacking parameter set including the target thickness, target diameter, and target strength of the pipe jacking based on the influence parameters of the multiple areas to be constructed corresponding to the multiple pipe jacking parameter sets.

[0027] The expressway involved in the embodiments of the present application refers to the expressway defined in the relevant standards.

[0028] In summary, the construction determination method for pipe jacking under an expressway provided by the embodiments of the present application obtains the modified Mohr-Coulomb constitutive model of the area to be constructed through a general geotechnical finite element calculation software and geological parameters, and inputs the multiple pipe jacking parameter sets into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of the area to be constructed corresponding to each pipe jacking parameter set in the multiple pipe jacking parameter sets. Then, based on the influence parameters of the multiple areas to be constructed corresponding to the multiple pipe jacking parameter sets, a target pipe jacking parameter set including the target thickness, target diameter, and target strength of the pipe jacking can be determined. In this way, the complex situation of the area to be constructed can be simulated with high precision through the modified Mohr-Coulomb constitutive model to improve the accuracy of the obtained target thickness, target diameter, and target strength of the pipe jacking, achieving the effect of improving the accuracy of this method.

[0029] Figure 2 It is a method flow chart of a construction determination method for pipe jacking under an expressway provided by the embodiments of the present application, which is used for the area to be constructed where there is an expressway. The method includes: Step 201: Obtain the geological parameters of the area to be constructed.

[0030] Among the geological parameters, the area to be constructed includes a breccia layer, a silty clay layer, and a gravel layer arranged successively downward along the ground surface. The expressway is located on the breccia layer, and the width of the expressway is 28 meters. The physical and mechanical parameters of the rock and soil layers are as follows: the unit weight of the breccia layer is 18 kN / m³, the internal friction angle is 10°, the cohesion is 12 kPa, the compression modulus is 3 MPa, the lateral resistance of the soil per unit area is 500 kN / m³, and the friction coefficient between the jacking pipe and the surrounding soil ranges from 0.1 to 0.2; the unit weight of the silty clay layer is 19.5 kN / m³, the internal friction angle is 13.5°, the cohesion is 17.5 kPa, the compression modulus is 4 MPa, the lateral resistance of the soil per unit area is 1000 kN / m³, and the friction coefficient between the jacking pipe and the surrounding soil ranges from 0.2 to 0.3; the unit weight of the gravel layer is 19.5 kN / m³, the internal friction angle is 23°, the cohesion is 0 kPa, the compression modulus is 10 MPa, the lateral resistance of the soil per unit area is 7000 kN / m³, and the friction coefficient between the jacking pipe and the surrounding soil ranges from 0.3 to 0.4.

[0031] Step 202: Based on the general geotechnical finite element calculation software and the geological parameters, obtain the modified Mohr-Coulomb constitutive model of the area to be constructed.

[0032] Figure 3 It is a schematic diagram of a modified Mohr-Coulomb constitutive model provided by an embodiment of the present application. As Figure 3 shown, the area to be constructed includes a breccia layer 31, a silty clay layer 32, and a gravel layer 33 arranged successively downward along the ground surface. The expressway pavement M is located on the breccia layer 31, and the jacking pipe 34 is located in the gravel layer 33. In the modified Mohr-Coulomb constitutive model, the soil body is formed by tetrahedral solid element structures, the jacking pipe 34 is a two-dimensional shell element, the bottom of the modified Mohr-Coulomb constitutive model adopts a fixed constraint, the side adopts a fixed normal displacement constraint, the top is a free surface, the length of the jacking pipe is 8 meters. When the modified Mohr-Coulomb constitutive model simulates the construction of the jacking pipe, the construction conditions of the jacking pipe include twelve conditions: initial stress field analysis, installation of the jacking pipe, first jacking of the jacking pipe, and second to tenth jacking of the jacking pipe.

[0033] In the modified Mohr-Coulomb constitutive model of the area to be constructed, the jacking pipe includes a jacking pipe sleeve and a jacking pipe joint. Both the jacking pipe sleeve and the jacking pipe joint are shell elements. The unit weight of the jacking pipe sleeve is 78 kN / m³, the elastic modulus is 210 MPa, the Poisson's ratio is 0.20, and the thickness is 0.02 m. The unit weight of the jacking pipe joint is 25 kN / m³, the elastic modulus is 30 MPa, the Poisson's ratio is 0.25, and the thickness is 0.275; The modified Mohr-Coulomb constitutive model of the area to be constructed has a size of 80 meters in the first direction, 40 meters in the second direction, and a height of 40 meters. The first direction is perpendicular to the length direction of the highway and parallel to the horizontal plane, and the second direction is perpendicular to the first direction and parallel to the horizontal plane. The modified Mohr-Coulomb constitutive model of the area to be constructed includes 140,785 elements and 25,508 nodes. By setting the interface element with a strength reduction coefficient of 0.7 between the rock and soil masses, the coupling effect between the concrete of the jacking pipe and the surrounding rock and soil masses is simulated, and the shrinkage rate of the pipe section of the jacking pipe is set to simulate the soil loss during the jacking pipe construction.

[0034] Step 203: Input the initial jacking pipe parameter group into the modified Mohr-Coulomb constitutive model to simulate the construction of the jacking pipe, and obtain the first influence parameter of each of the twelve working conditions during the construction of the jacking pipe. The first influence parameter is the ratio of the size of the settlement area to the diameter of the jacking pipe when the jacking pipe construction is carried out based on the initial jacking pipe parameter group.

[0035] In this application, the simulation of the vertical jacking of the jacking pipe section under the highway is divided into 12 construction steps. Step one corresponds to working condition one: initial stress field analysis, considering the initial stress of the entire site and the existing highway, and the groundwater level is set to 2.0 m. Step two corresponds to working condition two: installing the jacking pipe and applying the jacking force of the jacking pipe. Step three corresponds to working condition three: the first jacking of the jacking pipe, applying the first jacking force of the jacking pipe and installing the first section of the jacking pipe. Steps four to twelve correspond to working conditions four to twelve: the second to tenth jacking of the jacking pipe, respectively applying the second to tenth jacking forces of the jacking pipe and correspondingly installing the second to tenth sections of the jacking pipe.

[0036] Step 204: Determine multiple target working conditions among the first influence parameters of the twelve working conditions, where the first influence parameter is greater than the preset influence parameter threshold.

[0037] Among them, the preset influence parameter threshold can be an empirical value, for example, it can be data with representativeness and general value accumulated by the construction unit in long-term engineering practice.

[0038] Figure 4 It is a cross-sectional model diagram of the disturbance deformation of the jacking pipe provided by an embodiment of this application. Figure 5 It is a vertical deformation nephogram provided by an embodiment of this application, where Figure 4 Taking cross-section 41 at the midline of the area to be constructed (when tunneling 40 m, corresponding to working condition 7) as the analysis object, after the jacking pipe tunneling construction is completed, the distribution of the disturbance deformation of the surrounding soil layer at this place is as Figure 5 shown, combined with Figure 4 and Figure 5It can be seen that the deformation values of -10.017 mm (settlement) and 11.227 mm (uplift) occur at the top and bottom of the cross-section pipe jacking respectively. The settlement deformation at the top of the pipe jacking is jointly determined by the self-weight of the highway and the self-weight of the rock and soil mass. The uplift deformation at the bottom of the pipe jacking is mainly caused by the elastic deformation of the soil mass triggered by the unloading of the soil mass during the excavation of the pipe jacking. In addition, the surface deformation at this location presents a "Peck" curve, with the maximum deformation being -1.470 mm (settlement), and the surface deformation is basically 0 at 20 m to the left and right of the pipe jacking.

[0039] According to the above parameters, it is simulated that when the pipe jacking section vertically passes under the highway in the construction area to be shown in this application, it will cause surface settlement, but the settlement deformation risk is controllable.

[0040] Step 205: Obtain multiple pipe jacking parameter groups, and input the multiple pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of each pipe jacking parameter group in the construction area to be constructed under each target condition in multiple target conditions.

[0041] Figure 6 It is a curve graph of the change law of surface settlement provided by an embodiment of the present application, where Figure 6 The left figure shows the settlement change law of the surface transverse length from the pipe jacking center line under the conditions of working condition 5 (the 3rd jacking) to working condition 12 (jacking completed). It can be seen that when it reaches working condition 5, the settlement deformation of the highway transverse length begins to show the "Peck" curve change law. As the jacking continues, when working condition 9 (the pipe jacking completely crosses the highway) is completed, the change rate of the maximum settlement value in the surface transverse length direction is relatively fast. Subsequently, the maximum settlement value slowly increases to 1.467 mm. Based on this, the change law of the maximum surface settlement above the pipe jacking center line in the pipe jacking direction is listed, such as Figure 6 As shown on the right, during the pipe jacking process, the change law of the maximum surface settlement can be divided into five stages, specifically stage I (jacking 16 m), stage II (jacking 32 m), stage III (jacking 48 m), stage IV (jacking 64 m), and stage V (jacking 80 m), corresponding to the stable stage, slow growth stage, rapid growth stage, slow growth stage, and stable stage respectively. The maximum settlement change is the fastest in stage III, almost showing linear growth, which is because the pipe jacking is vertically passing under the highway at this stage, and the pipe jacking construction has the greatest impact on it.

[0042] In order to explore the influence of pipe jacking construction on surface disturbance, based on the "Code for Metro Rail Transit Engineering Survey", when the surface settlement does not exceed 1 mm, it can be considered that this point is not affected by pipe jacking construction. Therefore, it is assumed that the deformation length range corresponding to the settlement value of 1 mm is W . Figure 7 It is a curve graph of the surface settlement disturbance law provided by an embodiment of the present application, whereFigure 7 The left is the ground settlement disturbance law diagram under the condition of working condition 12. With a settlement value of 1 mm as the control value, the influence range of the pipe jacking is 13.0 m, corresponding to W / D the value of 4.333, which indicates that the lateral length range affected by the pipe jacking in the expressway is 4.333 times the diameter of the pipe jacking. In addition, in the longitudinal direction of the pipe jacking W / D the value change law is as Figure 7 shown on the right. When the pipe jacking length is less than 40 m (not exceeding working condition 7), W / D the value is 0. Subsequently, W / D the value increases slowly. When the pipe jacking length exceeds 64 m (greater than working condition 10), W / D the value remains stable, which indicates that after the pipe jacking passes through the expressway, the ground settlement at this place is basically stable.

[0043] The influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is carried out based on the pipe jacking parameter group. Each pipe jacking parameter group includes three parameters: the thickness, diameter, and strength of the pipe jacking, and one parameter in the three parameters of any two pipe jacking parameter groups is different.

[0044] 1.1) Obtain 5 first pipe jacking parameter groups. Any one of the first pipe jacking parameter groups includes the thickness, diameter, and strength of the pipe jacking, and the parameters except the thickness of the pipe jacking in the 5 first pipe jacking parameter groups are the same; In the 5 first pipe jacking parameter groups, the thicknesses of the pipe jacking are 0.6B0, 0.8B0, 1.0B0, 1.2B0, and 1.40B0 respectively, and B0 is the thickness of the pipe jacking in the initial pipe jacking parameter group.

[0045] 1.2) Input the 5 first pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, and obtain the thickness influence parameters of the 5 first pipe jacking parameter groups in multiple target working conditions. The thickness influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is carried out based on the first pipe jacking parameter group.

[0046] Establish a corresponding numerical model for calculation and solution, so as to obtain the influence law of different pipe jacking thicknesses on the ground settlement disturbance, Figure 8 is a curve diagram of the influence of the pipe jacking thickness on the ground settlement disturbance provided by the embodiment of the present application, where B 0 For 0.275 m. From Figure 8 the left (lateral deformation diagram), it can be seen that under different pipe jacking thickness conditions, the settlement deformation of the lateral length of the expressway all shows the "Peck" curve change law. Compared with the pipe jacking thickness greater than B0, when the pipe jacking thickness B is less than B 0, the relative change in the maximum ground settlement is relatively large. As can be seen from Figure 8 the right (disturbance range diagram), as the pipe jacking thickness B gradually increases, the maximum ground settlement deformation gradually decreases from -1.617 mm to -1.514 mm, -1.467 mm, -1.456 mm and -1.450 mm; taking the settlement value of 1 mm as the control value, the influence ranges of the pipe jacking are 14.8 m, 13.57 m, 13.0 m, 12.80 m and 12.70 m respectively, corresponding to W / D the values are 4.933, 4.523, 4.333, 4.267 and 4.233 respectively. The above results show that reducing the pipe jacking thickness has a greater impact on ground settlement than increasing the pipe jacking thickness, which means that the pipe jacking thickness needs to be reasonably considered during the construction of large-diameter pipe jacking.

[0047] 2.1) Obtain 5 groups of second pipe jacking parameters. Any one of the second pipe jacking parameter groups includes the thickness, diameter and strength of the pipe jacking, and the parameters other than the diameter of the pipe jacking in the 5 groups of second pipe jacking parameters are the same.

[0048] In the 5 groups of second pipe jacking parameters, the pipe jacking diameters are 0.5D0, 0.75D0, 1.0D0, 1.2D0 and 1.50D0 respectively, where D0 is the diameter of the pipe jacking in the initial pipe jacking parameter group.

[0049] 2.2) Input the 5 groups of second pipe jacking parameters into the modified Mohr-Coulomb constitutive model respectively, and obtain the diameter influence parameters of the 5 groups of second pipe jacking parameters in multiple target working conditions. The diameter influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when pipe jacking construction is carried out based on the second pipe jacking parameter group.

[0050] Establish a corresponding numerical model for calculation and solution, so as to obtain the influence law of different pipe jacking diameters on ground settlement disturbance, Figure 9 which is a curve diagram of the influence of pipe jacking diameter on ground settlement disturbance provided by an embodiment of the present application. Among them, D0 is 3.0 m. As can be seen from Figure 9 the left (lateral deformation diagram), under different pipe jacking diameter conditions, the settlement deformation of the lateral length of the highway all shows the "Peck" curve change law. As the pipe jacking diameter increases, the maximum ground settlement gradually increases, and the increasing rate is significantly faster. As can be seen from Figure 9 the right (disturbance range diagram), as the pipe jacking diameter DGradually increasing, the maximum surface settlement deformation gradually increases from -1.034 mm to -1.173 mm, -1.467 mm, -1.943 mm, and -2.735 mm; taking the settlement value of 1 mm as the control value, the influence ranges of the pipe jacking are 4.40 m, 9.20 m, 13.00 m, 17.10 m, and 21.00 m respectively, corresponding to W / D The values are 1.467, 3.067, 4.333, 5.700, and 7.000 respectively. The above results show that increasing the diameter of the pipe jacking has a greater impact on the surface settlement, which means that during the construction of large-diameter pipe jacking, it is necessary to pay attention to the surface settlement changes above in real time.

[0051] 3.1) Obtain 5 groups of third pipe jacking parameters. Any one of the third pipe jacking parameter groups includes the thickness, diameter, and strength of the pipe jacking, and the parameters except the strength of the pipe jacking in the 5 groups of third pipe jacking parameters are the same.

[0052] In the 5 groups of third pipe jacking parameters, the strengths of the pipe jacking are 0.6E0, 0.8E0, 1.0E0, 1.2E0, and 1.40E0 respectively, and E0 is the strength of the pipe jacking in the initial pipe jacking parameter group.

[0053] 3.2) Input the 5 groups of third pipe jacking parameters into the modified Mohr-Coulomb constitutive model respectively, and obtain the strength influence parameters of the 5 groups of third pipe jacking parameters in multiple target working conditions. The strength influence parameter is a measure of the ratio of the size of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is carried out based on the third pipe jacking parameter group.

[0054] Establish the corresponding numerical model for calculation and solution, so as to obtain the influence law of different pipe jacking diameters on the surface settlement disturbance, Figure 10 It is a curve graph showing the influence of the pipe jacking strength on the surface settlement disturbance provided by the embodiment of the present application, where E 0 is 30.0 MPa. From Figure 10 The left (lateral deformation graph) shows that under different pipe jacking strength conditions, the settlement deformation of the transverse length of the expressway all shows the "Peck" curve change law. As the pipe jacking strength increases, the maximum surface settlement gradually becomes smaller, and the increasing rate significantly slows down. From Figure 10 The right (disturbance range graph) shows that as the pipe jacking strength E Gradually increasing, the maximum surface settlement deformation gradually decreases from -1.970 mm to -1.685 mm, -1.467 mm, -1.317 mm, and -1.190 mm; taking the settlement value of 1 mm as the control value, the influence ranges of the pipe jacking are 19.00 m, 15.95 m, 13.00 m, 10.70 m, and 8.00 m respectively, corresponding to W / DThe values are 6.333, 5.317, 4.333, 3.567, and 2.667 respectively. The above results show that increasing the pipe jacking strength has little effect on the ground settlement, which means that choosing reasonable strength parameters during the construction of large-diameter pipe jacking can effectively control the ground deformation.

[0055] Step 206: Based on the influence parameters of multiple construction areas to be constructed corresponding to multiple pipe jacking parameter groups, determine a target pipe jacking parameter group including the target thickness, target diameter, and target strength of the pipe jacking.

[0056] 1.3) Determine the thickness of the pipe jacking in the first pipe jacking parameter group with the smallest thickness influence parameter among the five first pipe jacking parameter groups in multiple target working conditions as the target thickness of the pipe jacking.

[0057] 2.3) Determine the diameter of the pipe jacking in the second pipe jacking parameter group with the smallest diameter influence parameter among the five second pipe jacking parameter groups in multiple target working conditions as the target diameter of the pipe jacking.

[0058] 3.3) Determine the strength of the pipe jacking in the third pipe jacking parameter group with the smallest strength influence parameter among the five third pipe jacking parameter groups in multiple target working conditions as the target strength of the pipe jacking.

[0059] In summary, the construction determination method for pipe jacking under a highway provided by the embodiment of the present application obtains the modified Mohr-Coulomb constitutive model of the construction area to be constructed through general geotechnical finite element calculation software and geological parameters, and inputs multiple pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of each pipe jacking parameter group in the multiple pipe jacking parameter groups corresponding to the construction area to be constructed. Then, based on the influence parameters of multiple construction areas to be constructed corresponding to multiple pipe jacking parameter groups, a target pipe jacking parameter group including the target thickness, target diameter, and target strength of the pipe jacking can be determined. In this way, the complex situation of the construction area to be constructed can be accurately simulated through the modified Mohr-Coulomb constitutive model, so as to improve the accuracy of the obtained target thickness, target diameter, and target strength of the pipe jacking, achieving the effect of improving the accuracy of this method.

[0060] The following is an embodiment of the device of the present disclosure, which can be used to execute the embodiment of the method of the present disclosure. For details not disclosed in the embodiment of the device of the present disclosure, please refer to the embodiment of the method of the present disclosure.

[0061] Figure 11 It is a block diagram of a construction determination device for pipe jacking under a highway provided by an embodiment of the present application. This device can be used for a construction area to be constructed, and this construction area to be constructed has a highway. The construction determination device 100 for pipe jacking under a highway includes: The parameter acquisition module 110 is used to acquire the geological parameters of the area to be constructed. Among the geological parameters, the area to be constructed includes a breccia layer, a silty clay layer, and a gravel layer arranged sequentially downward along the ground surface. The highway is located on the breccia layer, and the width of the highway is 28 meters.

[0062] The model determination module 120 is used to obtain the modified Mohr-Coulomb constitutive model of the area to be constructed based on the general geotechnical finite element calculation software and the geological parameters. In the modified Mohr-Coulomb constitutive model, the soil body is formed by tetrahedral solid element structures, the pipe jacking is a two-dimensional shell element, the bottom of the modified Mohr-Coulomb constitutive model adopts a fixed constraint, the side adopts a fixed normal displacement constraint, the top is a free surface, the length of the pipe jacking is 8 meters. When the modified Mohr-Coulomb constitutive model simulates the construction of the pipe jacking, the construction conditions of the pipe jacking include twelve conditions such as the initial stress field analysis, installation of the pipe jacking, the first pipe jacking, and the second to tenth pipe jackings.

[0063] The pipe jacking parameter acquisition module 130 is used to acquire multiple groups of pipe jacking parameters and input the multiple groups of pipe jacking parameters into the modified Mohr-Coulomb constitutive model respectively to obtain the influence parameters of the area to be constructed corresponding to each group of pipe jacking parameters in the multiple groups of pipe jacking parameters. The influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is carried out based on the group of pipe jacking parameters. Each group of pipe jacking parameters includes three parameters: the thickness, diameter, and strength of the pipe jacking, and one of the three parameters in any two groups of pipe jacking parameters is different.

[0064] The target parameter determination module 140 is used to determine the target pipe jacking parameter group including the target thickness, target diameter, and target strength of the pipe jacking based on the influence parameters of the multiple areas to be constructed corresponding to the multiple groups of pipe jacking parameters.

[0065] In this application, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. The term "multiple" means two or more, unless otherwise clearly defined.

[0066] In several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only illustrative. For example, the division of the units is only a logical function division, and there can be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed coupling or direct coupling or communication connection between each other can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be in an electrical, mechanical or other forms.

[0067] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or may be distributed across multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0068] Those of ordinary skill in the art can understand that all or part of the steps to implement the above embodiments can be completed by hardware, or can be completed by a program instructing relevant hardware. The program can be stored in a computer-readable storage medium. The storage medium mentioned above can be a read-only memory, a magnetic disk, an optical disk, or the like.

[0069] The above are only alternative embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A construction determination method for pipe jacking under a highway, characterized in that For a construction area to be constructed, the construction area to be constructed has a highway, and the method includes: Obtain geological parameters of the construction area to be constructed. In the geological parameters, the construction area to be constructed includes a breccia layer, a silty clay layer, and a gravel layer arranged successively downward along the surface. The highway is located on the breccia layer, and the width of the highway is 28 meters; Based on general geotechnical finite element calculation software and the geological parameters, obtain a modified Mohr-Coulomb constitutive model of the construction area to be constructed. In the modified Mohr-Coulomb constitutive model, the soil body is formed by tetrahedral solid element structures, the pipe jacking is a two-dimensional shell element, the bottom of the modified Mohr-Coulomb constitutive model adopts a fixed constraint, and the side adopts a fixed normal displacement constraint; Obtain multiple pipe jacking parameter groups, and input the multiple pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, to obtain the influence parameters of the construction area to be constructed corresponding to each pipe jacking parameter group in the multiple pipe jacking parameter groups. The influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when pipe jacking construction is carried out based on the pipe jacking parameter group. Each pipe jacking parameter group includes three parameters: the thickness, diameter, and strength of the pipe jacking, and one of the three parameters in any two pipe jacking parameter groups is different; Based on the influence parameters of the multiple construction areas to be constructed corresponding to the multiple pipe jacking parameter groups, determine a target pipe jacking parameter group including the target thickness, target diameter, and target strength of the pipe jacking.

2. The method according to claim 1, wherein The top of the modified Mohr-Coulomb constitutive model is a free surface, the length of the pipe jacking is 8 meters. When the modified Mohr-Coulomb constitutive model simulates the construction of the pipe jacking, the construction conditions of the pipe jacking include twelve conditions: initial stress field analysis, installing the pipe jacking, the first pipe jacking, and the second to tenth pipe jackings; Before the step of obtaining multiple pipe jacking parameter groups, inputting the multiple pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, and obtaining the influence parameters of the construction area to be constructed corresponding to each pipe jacking parameter group in the multiple pipe jacking parameter groups, the method further includes: Input an initial pipe jacking parameter group into the modified Mohr-Coulomb constitutive model to simulate the construction of the pipe jacking, and obtain the first influence parameter of each of the twelve conditions during the construction of the pipe jacking. The first influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when pipe jacking construction is carried out based on the initial pipe jacking parameter group; Determine multiple target conditions among the first influence parameters of the twelve conditions, where the first influence parameter is greater than a preset influence parameter threshold; The step of obtaining multiple pipe jacking parameter groups, inputting the multiple pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, and obtaining the influence parameters of the construction area to be constructed corresponding to each pipe jacking parameter group in the multiple pipe jacking parameter groups includes: Obtain multiple pipe jacking parameter groups, and input the multiple pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, to obtain the influence parameters of the construction area to be constructed corresponding to each pipe jacking parameter group in each of the multiple target conditions among the multiple target conditions.

3. The method according to claim 2, wherein Obtaining multiple pipe jacking parameter sets and respectively inputting the multiple pipe jacking parameter sets into the modified Mohr-Coulomb constitutive model to obtain the influence parameters of each target working condition in the multiple target working conditions for the to-be-constructed area corresponding to each pipe jacking parameter set in the multiple pipe jacking parameter sets, including: Obtaining 5 first pipe jacking parameter sets, any one of the first pipe jacking parameter sets including the thickness, diameter, and strength of the pipe jacking, and the parameters other than the thickness of the pipe jacking in the 5 first pipe jacking parameter sets being the same; Respectively inputting the 5 first pipe jacking parameter sets into the modified Mohr-Coulomb constitutive model to respectively obtain the thickness influence parameters of the 5 first pipe jacking parameter sets in the multiple target working conditions, where the thickness influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when pipe jacking construction is carried out based on the first pipe jacking parameter set; Determining a target pipe jacking parameter set including the target thickness, target diameter, and target strength of the pipe jacking based on the influence parameters of the multiple to-be-constructed areas corresponding to the multiple pipe jacking parameter sets, including: Determining the thickness of the pipe jacking in the first pipe jacking parameter set with the smallest thickness influence parameter among the 5 first pipe jacking parameter sets in the multiple target working conditions as the target thickness of the pipe jacking.

4. The method according to claim 3, wherein Among the 5 first pipe jacking parameter sets, the thicknesses of the pipe jacking are 0.6B0, 0.8B0, 1.0B0, 1.2B0, and 1.40B0 respectively, where B0 is the thickness of the pipe jacking in the initial pipe jacking parameter set.

5. The method according to claim 2, characterized in that, Obtaining multiple pipe jacking parameter sets and respectively inputting the multiple pipe jacking parameter sets into the modified Mohr-Coulomb constitutive model to obtain the influence parameters of each target working condition in the multiple target working conditions for the to-be-constructed area corresponding to each pipe jacking parameter set in the multiple pipe jacking parameter sets, including: Obtaining 5 second pipe jacking parameter sets, any one of the second pipe jacking parameter sets including the thickness, diameter, and strength of the pipe jacking, and the parameters other than the diameter of the pipe jacking in the 5 second pipe jacking parameter sets being the same; Respectively inputting the 5 second pipe jacking parameter sets into the modified Mohr-Coulomb constitutive model to respectively obtain the diameter influence parameters of the 5 second pipe jacking parameter sets in the multiple target working conditions, where the diameter influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when pipe jacking construction is carried out based on the second pipe jacking parameter set; Determining a target pipe jacking parameter set including the target thickness, target diameter, and target strength of the pipe jacking based on the influence parameters of the multiple to-be-constructed areas corresponding to the multiple pipe jacking parameter sets, including: Determining the diameter of the pipe jacking in the second pipe jacking parameter set with the smallest diameter influence parameter among the 5 second pipe jacking parameter sets in the multiple target working conditions as the target diameter of the pipe jacking.

6. The method according to claim 5, wherein Among the 5 second pipe jacking parameter sets, the diameters of the pipe jacking are 0.5D0, 0.75D0, 1.0D0, 1.2D0, and 1.50D0 respectively, where D0 is the diameter of the pipe jacking in the initial pipe jacking parameter set.

7. The method according to claim 2, wherein Obtaining multiple pipe jacking parameter groups and respectively inputting the multiple pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model to obtain the influence parameters of each target working condition in the multiple target working conditions for the to-be-constructed area corresponding to each pipe jacking parameter group in the multiple pipe jacking parameter groups, including: Obtaining 5 third pipe jacking parameter groups, any one of the third pipe jacking parameter groups including the thickness, diameter and strength of the pipe jacking, and the parameters except the strength of the pipe jacking in the 5 third pipe jacking parameter groups being the same; Respectively inputting the 5 third pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model to respectively obtain the strength influence parameters of the 5 third pipe jacking parameter groups in the multiple target working conditions, the strength influence parameter being the ratio of the size of the settlement area to the diameter of the pipe jacking when performing pipe jacking construction based on the third pipe jacking parameter group; Determining a target pipe jacking parameter group including the target thickness, target diameter and target strength of the pipe jacking based on the influence parameters of the multiple to-be-constructed areas corresponding to the multiple pipe jacking parameter groups, including: Determining the strength of the pipe jacking in the third pipe jacking parameter group with the minimum strength influence parameter among the 5 third pipe jacking parameter groups in the multiple target working conditions as the target strength of the pipe jacking.

8. The method according to claim 7, characterized in that Among the 5 third pipe jacking parameter groups, the strengths of the pipe jacking are 0.6E0, 0.8E0, 1.0E0, 1.2E0 and 1.40E0 respectively, and E0 is the strength of the pipe jacking in the initial pipe jacking parameter group.

9. The method according to claim 2, characterized in that, In the modified Mohr-Coulomb constitutive model of the to-be-constructed area, the pipe jacking includes a pipe jacking sleeve and a pipe jacking segment. Both the pipe jacking sleeve and the pipe jacking segment are shell elements. The unit weight of the pipe jacking sleeve is 78 kN / m³, the elastic modulus is 210 MPa, the Poisson's ratio is 0.20, and the thickness is 0.02 m. The unit weight of the pipe jacking segment is 25 kN / m³, the elastic modulus is 30 MPa, the Poisson's ratio is 0.25, and the thickness is 0.275; The size of the modified Mohr-Coulomb constitutive model of the to-be-constructed area in the first direction is 80 m, the size in the second direction is 40 m, and the height is 40 m. The first direction is perpendicular to the length direction of the highway and parallel to the horizontal plane. The second direction is perpendicular to the first direction and parallel to the horizontal plane. The modified Mohr-Coulomb constitutive model of the to-be-constructed area includes 140785 units and 25508 nodes. By setting the interface unit with a strength reduction coefficient of 0.7 between the rock and soil masses, the coupling effect between the concrete of the pipe jacking and the surrounding rock and soil masses is simulated, and the shrinkage rate of the pipe jacking segment is set to simulate the soil loss during pipe jacking construction.

10. A construction determination device for pipe jacking under a highway, characterized in that, For the to-be-constructed area, the to-be-constructed area has a highway, and the construction determination device for the pipe jacking to pass under the highway includes: A parameter acquisition module for acquiring the geological parameters of the to-be-constructed area. In the geological parameters, the to-be-constructed area includes a gravel layer, a silty clay layer and a gravel layer arranged in sequence from the ground surface downwards. The highway is located on the gravel layer, and the width of the highway is 28 m; A model determination module, configured to obtain a modified Mohr-Coulomb constitutive model of the to-be-constructed area based on a general geotechnical finite element calculation software and the geological parameters. In the modified Mohr-Coulomb constitutive model, the soil body is formed by using a tetrahedral solid element structure; A pipe jacking parameter acquisition module, configured to acquire a plurality of pipe jacking parameter groups, and input the plurality of pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, so as to obtain influence parameters of the to-be-constructed area corresponding to each pipe jacking parameter group in the plurality of pipe jacking parameter groups. The influence parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when pipe jacking construction is carried out based on the pipe jacking parameter group. Each pipe jacking parameter group includes three parameters: the thickness, diameter, and strength of the pipe jacking, and one of the three parameters in any two pipe jacking parameter groups is different; A target parameter determination module, configured to determine a target pipe jacking parameter group including the target thickness, target diameter, and target strength of the pipe jacking based on the influence parameters of the plurality of to-be-constructed areas corresponding to the plurality of pipe jacking parameter groups.

Images