Construction method and device for pipe jacking under expressway

Abstract

The present disclosure provides a method and device for determining the construction of a jacking pipe under a highway, which belongs to the field of jacking pipe construction technology. It is used for an area to be constructed, and the area to be constructed has a highway. The method includes: obtaining geological parameters of the area to be constructed, and based on general geotechnical finite element calculation software and geological parameters, obtaining a modified Mohr-Coulomb constitutive model of the area to be constructed, taking multiple jacking pipe parameter groups, and inputting the multiple jacking pipe parameter groups into the modified Mohr-Coulomb constitutive model respectively, obtaining the influencing parameters of the area to be constructed corresponding to each of the multiple jacking pipe parameter groups, and determining a target jacking pipe parameter group including the target thickness, target diameter, and target strength of the jacking pipe based on the influencing parameters of the multiple jacking pipe parameter groups corresponding to the multiple jacking pipe parameter groups. By improving the accuracy of the obtained target thickness, target diameter, and target strength of the jacking pipe, the accuracy of the method is improved.

Description

Technical Field

[0001] The present application relates to the technical field of pipe jacking construction, and in particular to a method and device for determining the construction of a pipe jacking under a highway. Background Art

[0002] Pipe jacking is a crucial trenchless pipe laying technique in water conservancy projects. It enables the laying of pipelines for water transport, drainage, irrigation, and flood control. The method for determining pipe jacking under highways is used to determine some of the pipe jacking parameters used in pipe jacking construction.

[0003] In a current method for determining the construction of a pipe jacking under a highway, some parameters of the area to be constructed are first obtained, and based on these parameters and some related formulas, the diameter, thickness and strength of the pipe jacking are calculated. These parameters can then be used to carry out the pipe jacking construction.

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

[0005] The present invention provides a method and device for determining the construction of a pipe jacking under a highway, which can solve the problem of low accuracy in related technologies. The technical solution is as follows:

[0006] According to a first aspect of the present application, a method for determining construction of a pipe jacking under a highway is provided, the method being applied to a pending construction area, the pending construction area having a highway, the method comprising:

[0007] Obtaining geological parameters of the area to be constructed, wherein the geological parameters indicate that the area to be constructed includes a brecciated layer, a silty clay layer, and a sandy gravel layer sequentially arranged downward along the surface, the highway is located on the brecciated layer, and the width of the highway is 28 meters;

[0008] Based on general geotechnical finite element calculation software and the geological parameters, a modified Mohr-Coulomb constitutive model of the area to be constructed is obtained, wherein the soil is formed using a tetrahedral solid unit structure, the jacking pipe is a two-dimensional shell unit, and the bottom of the modified Mohr-Coulomb constitutive model adopts a fixed constraint and the side adopts a fixed normal displacement constraint;

[0009] Acquire multiple pipe jacking parameter groups, and input the multiple pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain an influencing parameter of the area to be constructed corresponding to each pipe jacking parameter group in the multiple pipe jacking parameter groups, wherein the influencing parameter is a ratio of a size of a settlement area to a diameter of the pipe jacking when pipe jacking construction is performed based on the pipe jacking parameter group, each pipe jacking parameter group includes three parameters of the pipe jacking: thickness, diameter, and strength, and any two pipe jacking parameter groups have one parameter different from the other of the three parameters;

[0010] Based on the influencing parameters of the plurality of areas to be constructed corresponding to the plurality of pipe jacking parameter groups, a target pipe jacking parameter group including a target thickness, a target diameter and a target strength of the pipe jacking is determined.

[0011] Optionally, the top is a free surface, the length of the jacking pipe is 8 meters, and when the modified Mohr-Coulomb constitutive model is used to simulate the construction of the jacking pipe, the working conditions of the jacking pipe construction include twelve working conditions: initial stress field analysis, installation of the jacking pipe, first jacking, and second to tenth jacking. Before obtaining multiple jacking pipe parameter groups and inputting the multiple jacking pipe parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain the influencing parameters of the to-be-constructed area corresponding to each of the multiple jacking pipe parameter groups, the method further includes:

[0012] Inputting the initial pipe jacking parameter group into the modified Mohr-Coulomb constitutive model to simulate the pipe jacking construction, and obtaining a first influencing parameter for each of the twelve working conditions during the pipe jacking construction, wherein the first influencing parameter is a ratio of a size of a settlement area to a diameter of the pipe jacking when the pipe jacking construction is performed based on the initial pipe jacking parameter group;

[0013] determining, among the first influencing parameters of the twelve operating conditions, a plurality of target operating conditions whose first influencing parameters are greater than a preset influencing parameter threshold;

[0014] The step of obtaining a plurality of pipe jacking parameter groups, inputting the plurality of pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model, and obtaining an influencing parameter of the to-be-constructed area corresponding to each of the plurality of pipe jacking parameter groups, includes:

[0015] A plurality of pipe jacking parameter groups are obtained, and the plurality of pipe jacking parameter groups are respectively input into the modified Mohr-Coulomb constitutive model to obtain an influencing parameter of each of the plurality of target working conditions in the area to be constructed corresponding to each pipe jacking parameter group in the plurality of pipe jacking parameter groups.

[0016] Optionally, the acquiring of a plurality of pipe jacking parameter groups, and inputting the plurality of pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, to obtain an influencing parameter of the area to be constructed corresponding to each of the plurality of pipe jacking parameter groups in the plurality of target working conditions, includes:

[0017] Acquire five first pipe jacking parameter groups, wherein any one of the first pipe jacking parameter groups includes the thickness, diameter, and strength of the pipe jacking, and the parameters in the five first pipe jacking parameter groups except the thickness of the pipe jacking are the same;

[0018] Inputting the five first pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, and obtaining thickness influencing parameters of the five first pipe jacking parameter groups in the multiple target working conditions respectively, wherein the thickness influencing parameters are the ratios of the size of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is performed based on the first pipe jacking parameter groups;

[0019] The determining of a target pipe jacking parameter group including a target thickness, a target diameter, and a target strength of the pipe jacking based on the influencing parameters of the plurality of areas to be constructed corresponding to the plurality of pipe jacking parameter groups comprises:

[0020] The thickness of the jacking pipe in the first jacking pipe parameter group having the smallest thickness influencing parameter among the five first jacking pipe parameter groups in the multiple target working conditions is determined as the target thickness of the jacking pipe.

[0021] Optionally, in the five first jacking pipe parameter groups, the thicknesses of the jacking pipes are 0.6B0, 0.8B0, 1.0B0, 1.2B0 and 1.40B0, respectively, and B0 is the thickness of the jacking pipe in the initial jacking pipe parameter group.

[0022] Optionally, the acquiring of a plurality of pipe jacking parameter groups, and inputting the plurality of pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, to obtain an influencing parameter of the area to be constructed corresponding to each of the plurality of pipe jacking parameter groups in the plurality of target working conditions, includes:

[0023] Acquire five second pipe jacking parameter groups, wherein any one of the second pipe jacking parameter groups includes the thickness, diameter, and strength of the pipe jacking, and the parameters of the five second pipe jacking parameter groups except the diameter of the pipe jacking are the same;

[0024] Inputting the five second pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, and obtaining diameter influence parameters of the five second pipe jacking parameter groups in the multiple target working conditions respectively, wherein the diameter influence parameters are the ratios of the size of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is performed based on the second pipe jacking parameter groups;

[0025] The determining of a target pipe jacking parameter group including a target thickness, a target diameter, and a target strength of the pipe jacking based on the influencing parameters of the plurality of areas to be constructed corresponding to the plurality of pipe jacking parameter groups comprises:

[0026] The diameter of the jacking pipe in the second jacking pipe parameter group having the smallest diameter influencing parameter among the five second jacking pipe parameter groups in the multiple target working conditions is determined as the target diameter of the jacking pipe.

[0027] Optionally, in the five second pipe jacking parameter groups, the pipe jacking diameters are 0.5D0, 0.75D0, 1.0D0, 1.2D0 and 1.50D0, respectively, and D0 is the diameter of the pipe jacking in the initial pipe jacking parameter group.

[0028] Optionally, the acquiring of a plurality of pipe jacking parameter groups, and inputting the plurality of pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, to obtain an influencing parameter of the area to be constructed corresponding to each of the plurality of pipe jacking parameter groups in the plurality of target working conditions, includes:

[0029] Acquire five third pipe jacking parameter groups, any one of the third pipe jacking parameter groups includes the thickness, diameter, and strength of the pipe jacking, and all parameters in the five third pipe jacking parameter groups except the strength of the pipe jacking are the same;

[0030] Inputting the five third pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, and obtaining strength influencing parameters of the five third pipe jacking parameter groups in the multiple target working conditions respectively, wherein the strength influencing parameters are ratios of the size of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is performed based on the third pipe jacking parameter group;

[0031] The determining of a target pipe jacking parameter group including a target thickness, a target diameter, and a target strength of the pipe jacking based on the influencing parameters of the plurality of areas to be constructed corresponding to the plurality of pipe jacking parameter groups comprises:

[0032] The strength of the jacking pipe in the third jacking pipe parameter group having the smallest strength influencing parameter among the five third jacking pipe parameter groups in the multiple target working conditions is determined as the target strength of the jacking pipe.

[0033] Optionally, in the five 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.

[0034] Optionally, 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 segment, the jacking pipe sleeve and the jacking pipe segment are both shell elements, the jacking pipe sleeve has a weight of 78 kilonewtons per cubic meter, an elastic modulus of 210 MPa, a Poisson's ratio of 0.20, and a thickness of 0.02 meter, and the jacking pipe segment has a weight of 25 kilonewtons per cubic meter, an elastic modulus of 30 MPa, a Poisson's ratio of 0.25, and a thickness of 0.275;

[0035] The modified Mohr-Coulomb constitutive model of the area to be constructed has a size of 80 meters in the first direction, a size of 40 meters in the second direction, and a height of 40 meters. The first direction is a direction perpendicular to the length direction of the highway and parallel to the horizontal plane, and the second direction is a direction 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 units and 25,508 nodes. The coupling effect between the concrete of the jacking pipe and the surrounding rock and soil is simulated by setting the interface unit with a strength reduction coefficient of 0.7 between the rock and soil bodies, and the pipe segment shrinkage rate of the jacking pipe is set to simulate the soil loss during the jacking pipe construction.

[0036] In another aspect, a device for determining a construction process of a pipe jacking under a highway is provided, the device being used in a construction area, wherein the construction area includes a highway. The device comprises:

[0037] a parameter acquisition module, configured to acquire geological parameters of the area to be constructed, wherein the geological parameters indicate that the area to be constructed includes a brecciated layer, a silty clay layer, and a sandy gravel layer sequentially arranged downward along the surface, the highway is located on the brecciated layer, and the width of the highway is 28 meters;

[0038] a model determination module, configured to obtain a modified Mohr-Coulomb constitutive model of the area to be constructed based on general geotechnical finite element calculation software and the geological parameters, wherein the soil in the modified Mohr-Coulomb constitutive model is formed using a tetrahedral solid unit structure, the jacking pipe is a two-dimensional shell unit, and the bottom of the modified Mohr-Coulomb constitutive model adopts a fixed constraint and the side adopts a fixed normal displacement constraint;

[0039] 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, to obtain an influencing parameter of the area to be constructed corresponding to each of the plurality of pipe jacking parameter groups, wherein the influencing parameter is a ratio of a size of a settlement area to a diameter of the pipe jacking when pipe jacking construction is performed based on the pipe jacking parameter group, wherein each pipe jacking parameter group includes three parameters of the pipe jacking: thickness, diameter, and strength, and any two pipe jacking parameter groups have one parameter different from the other of the three parameters;

[0040] The target parameter determination module is used to determine a target pipe jacking parameter group including a target thickness, a target diameter and a target strength of the pipe jacking based on the influencing parameters of the multiple areas to be constructed corresponding to the multiple pipe jacking parameter groups.

[0041] The beneficial effects of the technical solutions provided in the embodiments of the present application include at least:

[0042] Through general geotechnical finite element calculation software and geological parameters, a modified Mohr-Coulomb constitutive model of the area to be constructed is obtained, and multiple jacking parameter groups are respectively input into the modified Mohr-Coulomb constitutive model to obtain the influencing parameters of the area to be constructed corresponding to each of the multiple jacking parameter groups. Then, based on the influencing parameters of the multiple areas to be constructed corresponding to the multiple jacking parameter groups, a target jacking parameter group including the target thickness, target diameter and target strength of the jacking can be determined. In this way, the modified Mohr-Coulomb constitutive model can be used to perform high-precision simulations on the complex conditions of the area to be constructed, so as to improve the accuracy of the obtained target thickness, target diameter and target strength of the jacking, thereby achieving the effect of improving the accuracy of the method. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0044] Figure 1 This is a flow chart of a method for determining a construction method for a pipe jacking under a highway provided in an embodiment of the present application;

[0045] Figure 2 This 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;

[0046] Figure 3 Schematic diagram of a modified Mohr-Coulomb constitutive model provided in an embodiment of the present application;

[0047] Figure 4 This is a cross-sectional model diagram of a pipe jacking disturbance deformation provided in an embodiment of the present application;

[0048] Figure 5 This is a vertical deformation cloud map provided by an embodiment of the present application;

[0049] Figure 6 This is a surface subsidence variation curve provided by an embodiment of the present application;

[0050] Figure 7 This is a surface subsidence disturbance law curve diagram provided in an embodiment of the present application;

[0051] Figure 8 This is a curve diagram showing the effect of pipe jacking thickness on ground settlement disturbance provided by an embodiment of the present application;

[0052] Figure 9 This is a curve diagram showing the effect of pipe jacking diameter on ground settlement disturbance provided by an embodiment of the present application;

[0053] Figure 10 This is a curve diagram showing the effect of pipe jacking strength on ground settlement disturbance provided by an embodiment of the present application;

[0054] Figure 11 This is a block diagram of a construction determination device for pipe jacking under a highway provided in an embodiment of the present application.

[0055] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0056] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0057] One of the core tasks of water conservancy projects is water transmission, drainage, irrigation, and flood control. This inevitably involves laying a large number of pipelines. Furthermore, these pipelines often need to cross obstacles such as highways, railways, and densely built-up areas. Pipe jacking allows for the laying of pipelines beneath these obstacles with minimal or no excavation, avoiding damage and disruption to existing facilities (such as interrupting highway traffic), significantly reducing project risks and costs.

[0058] The construction determination method for jacking pipes under highways provided in the embodiments of the present application can be used in the pipeline laying construction of water conservancy projects to determine a target jacking pipe parameter group including the target thickness, target diameter and target strength of the jacking pipes, so as to improve the accuracy of the obtained parameters of these jacking pipes.

[0059] Figure 1 This is a flowchart of a method for determining the construction of a pipe jacking under a highway provided in an embodiment of the present application, which is used in a construction area where there is a highway. The method includes:

[0060] Step 101: Obtain geological parameters of the area to be constructed. The geological parameters indicate that the area to be constructed includes a breccia layer, a silty clay layer, and a gravel layer arranged in sequence downward along the surface. The highway is located on the breccia layer, and the width of the highway is 28 meters.

[0061] Step 102: Based on general geotechnical finite element calculation software and geological parameters, a modified Mohr-Coulomb constitutive model of the area to be constructed is obtained. In the modified Mohr-Coulomb constitutive model, the soil is formed using a tetrahedral solid unit structure, the jacking pipe is a two-dimensional shell unit, and the bottom of the modified Mohr-Coulomb constitutive model adopts a fixed constraint, and the side adopts a fixed normal displacement constraint.

[0062] The top of the model is a free surface, and the length of the jacking pipe is 8 meters. When the modified Mohr-Coulomb constitutive model is used to simulate 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, the first jacking pipe, and the second to tenth jacking pipes.

[0063] Step 103: Acquire multiple pipe jacking parameter groups, and input the multiple pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain an influencing parameter of the area to be constructed corresponding to each pipe jacking parameter group in the multiple pipe jacking parameter groups. The influencing parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is performed based on the pipe jacking parameter group. Each pipe jacking parameter group includes three parameters: thickness, diameter, and strength of the pipe jacking, and one of the three parameters of any two pipe jacking parameter groups is different.

[0064] Step 104 : Based on the influencing parameters of the multiple to-be-constructed areas corresponding to the multiple jacking parameter groups, a target jacking parameter group including a target thickness, a target diameter, and a target strength of the jacking pipe is determined.

[0065] The expressway involved in the embodiments of the present application refers to the expressway defined in the relevant standards.

[0066] In summary, the construction determination method for a jacking pipe under a highway provided in an embodiment of the present application obtains a modified Mohr-Coulomb constitutive model of the area to be constructed through general geotechnical finite element calculation software and geological parameters, and inputs multiple jacking pipe parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain the influencing parameters of the area to be constructed corresponding to each of the multiple jacking pipe parameter groups. After that, based on the influencing parameters of the multiple areas to be constructed corresponding to the multiple jacking pipe parameter groups, the target jacking pipe parameter group including the target thickness, target diameter and target strength of the jacking pipe can be determined. In this way, the complex situation of the construction area can be simulated with high precision by using the modified Mohr-Coulomb constitutive model to improve the accuracy of the obtained target thickness, target diameter and target strength of the jacking pipe, thereby achieving the effect of improving the accuracy of the method.

[0067] Figure 2 This is a flowchart of a method for determining the construction of a pipe jacking under a highway provided in an embodiment of the present application, which is used in a construction area where there is a highway. The method includes:

[0068] Step 201: Obtain geological parameters of the area to be constructed.

[0069] Among the geological parameters, the area to be constructed includes a breccia layer, a silty clay layer, and a gravel layer arranged in sequence along the surface. The highway is located on the breccia layer, and the width of the highway is 28 meters. The physical and mechanical parameters of the rock and soil layers are as follows: the density of the breccia layer is 18 kN per cubic meter, the internal friction angle is 10 degrees, the cohesion is 12 kPa, the compression modulus is 3 MPa, the lateral resistance of the unit area of ​​soil is 500 kN per cubic meter, the friction coefficient between the jacking pipe and the surrounding soil layer ranges from 0.1 to 0.2, the density of the silty clay layer is 19.5 kN per cubic meter, the internal friction angle is 13.5 degrees, the cohesion is 17.5 kPa, and the compression modulus is 3 MPa. The modulus is 4 MPa, the lateral resistance of soil per unit area is 1000 kN per cubic meter, the friction coefficient between the jacking pipe and the surrounding soil layer ranges from 0.2 to 0.3, the density of the gravel layer is 19.5 kN per cubic meter, the internal friction angle is 23 degrees, the cohesion is 0 kPa, the compression modulus is 10 MPa, the lateral resistance of soil per unit area is 7000 kN per cubic meter, and the friction coefficient between the jacking pipe and the surrounding soil layer ranges from 0.3 to 0.4.

[0070] Step 202: Based on general geotechnical finite element calculation software and geological parameters, a modified Mohr-Coulomb constitutive model of the area to be constructed is obtained.

[0071] Figure 3 is a schematic diagram of a modified Mohr-Coulomb constitutive model provided in the embodiment of the present application, such as Figure 3 As shown, the area to be constructed includes a breccia layer 31, a silty clay layer 32, and a gravel layer 33 arranged in sequence downward along the surface. The highway 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 is formed by a tetrahedral solid unit structure, and the jacking pipe 34 is a two-dimensional shell unit. 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, and 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, the first jacking pipe advancement, and the second to tenth jacking pipe advancements.

[0072] In the modified Mohr-Coulomb constitutive model of the area to be constructed, the jacking pipe includes the jacking pipe sleeve and the jacking pipe segment. The jacking pipe sleeve and the jacking pipe segment are both shell elements. The jacking pipe sleeve has a weight of 78 kN / m3, an elastic modulus of 210 MPa, a Poisson's ratio of 0.20, and a thickness of 0.02 m. The jacking pipe segment has a weight of 25 kN / m3, an elastic modulus of 30 MPa, a Poisson's ratio of 0.25, and a thickness of 0.275.

[0073] The modified Mohr-Coulomb constitutive model of the area to be constructed has a size of 80 meters in the first direction, a size of 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 units and 25,508 nodes. By setting the interface unit with a strength reduction coefficient of 0.7 between the rock and soil bodies, the coupling effect between the concrete of the jacking pipe and the surrounding rock and soil is simulated, and the pipe segment shrinkage rate of the jacking pipe is set to simulate the soil loss during the jacking construction.

[0074] Step 203: Input the initial pipe jacking parameter set into the modified Mohr-Coulomb constitutive model to simulate the pipe jacking construction, and obtain the first influencing parameter of each of the twelve working conditions during the pipe jacking construction process. The first influencing parameter is the ratio of the size of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is performed based on the initial pipe jacking parameter set.

[0075] In this application, the simulation of the jacking section vertically passing 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 2.0m. Step two corresponds to working condition two: installing the jacking pipe and applying the jacking force. Step three corresponds to working condition three: the first jacking, applying the first jacking force, and installing the first section of the jacking pipe. Steps four to twelve correspond to working conditions four to twelve: the 2nd to 10th jacking, applying the 2nd to 10th jacking forces respectively, and installing the 2nd to 10th sections of the jacking pipe.

[0076] Step 204 : Determine a plurality of target operating conditions whose first influencing parameters are greater than a preset influencing parameter threshold value among the first influencing parameters of the twelve operating conditions.

[0077] The preset influencing parameter threshold may be an empirical value, for example, data with representativeness and universal value accumulated by the construction unit in long-term engineering practice.

[0078] Figure 4 This is a cross-sectional model diagram of a pipe jacking disturbance deformation provided in an embodiment of the present application. Figure 5 is a vertical deformation cloud map provided by the embodiment of the present application, wherein Figure 4The analysis object is section 41 at the center line of the construction area (when the tunneling is 40m, corresponding to working condition 7). After the jacking tunneling is completed, the distribution of the disturbance deformation of the surrounding soil layer is as follows: Figure 5 As shown, combined Figure 4 and Figure 5 The upper and lower sections of the pipe jacking section experienced deformations of -10.017mm (sinking) and 11.227mm (uplifting), respectively. The upper section's settlement is determined by the combined weight of the highway and the rock mass, while the lower section's uplift is primarily due to elastic deformation of the soil caused by unloading during pipe jacking excavation. Furthermore, the ground deformation at this location exhibits a "Peck" curve, with a maximum deformation of -1.470mm (sinking). Surface deformation is essentially zero 20 meters to the left and right of the pipe jacking.

[0079] According to the simulation of the above parameters, in the area to be constructed shown in this application, when the top pipe section vertically passes under the highway, it will cause surface settlement, but the risk of settlement and deformation is controllable.

[0080] Step 205 : Acquire multiple pipe jacking parameter groups, and input the multiple pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain the influencing parameters of each target working condition in the area to be constructed corresponding to each pipe jacking parameter group in the multiple pipe jacking parameter groups.

[0081] Figure 6 is a surface subsidence variation curve provided by the embodiment of the present application, wherein Figure 6 The middle left figure shows the settlement change pattern of the horizontal length of the ground surface from the center line of the jacking pipe under working conditions 5 (the third jacking) to working conditions 12 (jacking completed). It can be seen that when working condition 5 is reached, the settlement deformation of the horizontal length of the highway begins to show a "Peck" curve change pattern. As the jacking continues, when working condition 9 is completed (the jacking pipe completely crosses the highway), the maximum settlement value in the horizontal length direction of the ground surface changes at a faster rate, and then the maximum settlement value slowly increases to 1.467mm. Based on this, the change pattern of the maximum surface settlement above the center line of the jacking pipe in the direction of jacking is listed, as follows: Figure 6 As shown on the right, during the tunneling process, the maximum surface settlement changes can be divided into five stages, namely stage I (16m advance), stage II (32m advance), stage III (48m advance), stage IV (64m advance) and stage V (80m advance), which correspond to the stable stage, slow growth stage, rapid growth stage, slow growth stage and stable stage respectively. In stage III, the maximum settlement changes the fastest, showing almost linear growth. This is because the tunneling construction is having the greatest impact on it as the tunnel is passing vertically under the highway during this stage.

[0082] In order to explore the impact of pipe jacking construction on surface disturbance, based on the "Metro Rail Transit Engineering Measurement Specifications", when the surface settlement does not exceed 1 mm, it can be considered that the 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 is a surface subsidence disturbance law curve provided by the embodiment of the present application, wherein Figure 7 The left side is the surface settlement disturbance law diagram under working condition 12. With the settlement value of 1 mm as the control value, the influence range of the jacking pipe is 13.0m, corresponding to W / D The value is 4.333, which indicates that the horizontal length range affected by the jacking tunneling highway is 4.333 times the jacking diameter. W / D The value change rule is as follows Figure 7 As shown on the right, when the jacking length is less than 40m (not exceeding working condition 7), W / D The value is 0, then W / D The value increases slowly. When the tunneling length exceeds 64m (greater than working condition 10), W / D The value remains stable, which shows that the surface settlement is basically stable after the jacking pipe passes through the highway.

[0083] The influencing parameter is the ratio of the size of the settlement area to the diameter of the jacking pipe when the jacking construction is carried out based on the jacking parameter group. Each jacking parameter group includes three parameters: the thickness, diameter and strength of the jacking pipe, and one of the three parameters of any two jacking parameter groups is different.

[0084] 1.1) Obtaining five first pipe jacking parameter groups, where any one of the first pipe jacking parameter groups includes the thickness, diameter, and strength of the pipe jacking, and all parameters except the thickness of the pipe jacking are the same in the five first pipe jacking parameter groups;

[0085] In the five first jacking parameter groups, the thicknesses of the jacking pipes are 0.6B0, 0.8B0, 1.0B0, 1.2B0 and 1.40B0, respectively, where B0 is the thickness of the jacking pipe in the initial jacking parameter group.

[0086] 1.2) The five first pipe jacking parameter groups were input into the modified Mohr-Coulomb constitutive model to obtain thickness influence parameters for each of the five first pipe jacking parameter groups under multiple target working conditions. The thickness influence parameter is the ratio of the settlement area to the diameter of the pipe jacking when pipe jacking is performed based on the first pipe jacking parameter group.

[0087] The corresponding numerical model is established and solved to obtain the influence of different jacking pipe thicknesses on surface settlement disturbance. Figure 8This is a curve diagram of the effect of pipe thickness on ground settlement disturbance provided by an embodiment of the present application, wherein B 0 for 0.275m, from Figure 8 The left (lateral deformation diagram) shows that under different pipe thickness conditions, the lateral length settlement deformation of the highway shows the "Peck curve" change law. B 0, when the top pipe thickness B Less than B At 0, the maximum surface settlement changes relatively greatly. Figure 8 As can be seen from the right (disturbance range diagram), as the thickness of the top pipe increases B The maximum surface settlement deformation gradually increases from -1.617mm to -1.514mm, -1.467mm, -1.456mm and -1.450mm. Taking the settlement value of 1 mm as the control value, the influence range of the jacking pipe is 14.8m, 13.57m, 13.0m, 12.80m and 12.70m 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 thickness of the jacking pipe has a greater impact on the surface settlement than increasing the thickness of the jacking pipe, which means that the thickness of the jacking pipe should be reasonably considered when constructing large-diameter jacking pipes.

[0088] 2.1) Obtain five second pipe jacking parameter groups, where any one of the second pipe jacking parameter groups includes the thickness, diameter, and strength of the pipe jacking, and all parameters except the diameter of the pipe jacking are the same in the five second pipe jacking parameter groups.

[0089] In the five second pipe jacking parameter groups, 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.

[0090] 2.2) The five second pipe jacking parameter sets were input into the modified Mohr-Coulomb constitutive model to obtain the diameter influence parameters for each of the five second pipe jacking parameter sets under multiple target working conditions. The diameter influence parameter is the ratio of the settlement area size to the pipe diameter when pipe jacking construction is performed based on the second pipe jacking parameter set.

[0091] The corresponding numerical model is established and solved to obtain the influence of different jacking pipe diameters on surface settlement disturbance. Figure 9 This is a curve diagram of the influence of the top pipe diameter on the surface settlement disturbance provided by the embodiment of the present application, where D0 is 3.0m. Figure 9As can be seen from the left (lateral deformation diagram), under different pipe diameter conditions, the lateral length settlement deformation of the highway shows a "Peck curve" change law. As the pipe diameter increases, the maximum surface settlement gradually increases, and the rate of increase becomes significantly faster. Figure 9 As can be seen from the right (disturbance range diagram), as the diameter of the top pipe increases D The maximum surface settlement deformation gradually increases from -1.034mm to -1.173mm, -1.467mm, -1.943mm and -2.735mm. Taking the settlement value of 1 mm as the control value, the influence range of the jacking pipe is 4.40m, 9.20m, 13.00m, 17.10m and 21.00m 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 jacking pipe has a greater impact on the surface settlement, which means that when constructing large-diameter jacking pipes, it is necessary to pay real-time attention to the changes in the surface settlement above.

[0092] 3.1) Obtain five third pipe jacking parameter groups, where each third pipe jacking parameter group includes the thickness, diameter, and strength of the pipe jacking, and all parameters except the strength of the pipe jacking are the same in the five third pipe jacking parameter groups.

[0093] In the five third pipe jacking parameter groups, 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.

[0094] 3.2) The five third pipe jacking parameter groups were input into the modified Mohr-Coulomb constitutive model to obtain the strength influence parameters for each of the five third pipe jacking parameter groups under multiple target working conditions. The strength influence parameters measure the ratio of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is performed based on the third pipe jacking parameter group.

[0095] The corresponding numerical model is established and solved to obtain the influence of different jacking pipe diameters on surface settlement disturbance. Figure 10 This is a curve diagram of the influence of pipe jacking strength on ground settlement disturbance provided by the embodiment of the present application, wherein E 0 is 30.0MPa. Figure 10 As can be seen from the left (lateral deformation diagram), under different pipe jacking strength conditions, the lateral length settlement deformation of the highway shows a "Peck curve" change law. As the pipe jacking strength increases, the maximum surface settlement gradually decreases, and the rate of increase slows down significantly. Figure 10 As can be seen from the right (disturbance range diagram), as the pipe jacking strength increases EThe maximum surface settlement deformation gradually increases from -1.970mm to -1.685mm, -1.467mm, -1.317mm and -1.190mm. Taking the settlement value of 1 mm as the control value, the influence range of the jacking pipe is 19.00m, 15.95m, 13.00m, 10.70m and 8.00m respectively, corresponding to W / D The values ​​are 6.333, 5.317, 4.333, 3.567, and 2.667, respectively. The above results show that increasing the jacking strength has little effect on the surface settlement, which means that choosing reasonable strength parameters during large-diameter jacking construction can effectively control surface deformation.

[0096] Step 206 : Based on the influencing parameters of the multiple to-be-constructed areas corresponding to the multiple jacking parameter groups, a target jacking parameter group including a target thickness, a target diameter, and a target strength of the jacking pipe is determined.

[0097] 1.3) The thickness of the jacking pipe in the first jacking pipe parameter group having the smallest thickness influencing parameter among the five first jacking pipe parameter groups in multiple target working conditions is determined as the target thickness of the jacking pipe.

[0098] 2.3) The diameter of the jacking pipe in the second jacking pipe parameter group with the smallest diameter-influencing parameter among the five second jacking pipe parameter groups in multiple target working conditions is determined as the target diameter of the jacking pipe.

[0099] 3.3) The strength of the pipe jacking in the third pipe jacking parameter group with the smallest strength influencing parameter among the five third pipe jacking parameter groups in multiple target working conditions is determined as the target strength of the pipe jacking.

[0100] In summary, the construction determination method for a jacking pipe under a highway provided in an embodiment of the present application obtains a modified Mohr-Coulomb constitutive model of the area to be constructed through general geotechnical finite element calculation software and geological parameters, and inputs multiple jacking pipe parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain the influencing parameters of the area to be constructed corresponding to each of the multiple jacking pipe parameter groups. After that, based on the influencing parameters of the multiple areas to be constructed corresponding to the multiple jacking pipe parameter groups, the target jacking pipe parameter group including the target thickness, target diameter and target strength of the jacking pipe can be determined. In this way, the complex situation of the construction area can be simulated with high precision by using the modified Mohr-Coulomb constitutive model to improve the accuracy of the obtained target thickness, target diameter and target strength of the jacking pipe, thereby achieving the effect of improving the accuracy of the method.

[0101] The following are embodiments of the apparatus disclosed herein, which can be used to implement the method embodiments disclosed herein. For details not disclosed in the apparatus embodiments disclosed herein, please refer to the method embodiments disclosed herein.

[0102] Figure 11This is a block diagram of a device for determining a construction process of a pipe jacking under a highway provided by an embodiment of the present application. The device can be used in a construction area where a highway is located. The device 100 includes:

[0103] The parameter acquisition module 110 is used to obtain 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 in sequence downward along the surface. The highway is located on the breccia layer, and the width of the highway is 28 meters.

[0104] The model determination module 120 is used to obtain a modified Mohr-Coulomb constitutive model of the area to be constructed based on general geotechnical finite element calculation software and geological parameters. In the modified Mohr-Coulomb constitutive model, the soil is formed by a tetrahedral solid unit structure, and the jacking pipe is a two-dimensional shell unit. 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, and 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, the first jacking pipe advancement, and the second to tenth jacking pipe advancements.

[0105] The jacking parameter acquisition module 130 is used to obtain multiple jacking parameter groups and input the multiple jacking parameter groups into the modified Mohr-Coulomb constitutive model to obtain the influencing parameters of the area to be constructed corresponding to each of the multiple jacking parameter groups. The influencing parameters are the ratio of the size of the settlement area to the diameter of the jacking pipe when the jacking construction is performed based on the jacking parameter group. Each jacking parameter group includes three parameters: the thickness, diameter and strength of the jacking pipe, and one of the three parameters of any two jacking parameter groups is different.

[0106] The target parameter determination module 140 is used to determine a target pipe jacking parameter group including a target thickness, a target diameter and a target strength of the pipe jacking based on the influencing parameters of the multiple to-be-constructed areas corresponding to the multiple pipe jacking parameter groups.

[0107] In this application, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "plurality" refers to two or more than two, unless otherwise clearly defined.

[0108] In the 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 merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0109] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0110] Those skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware, or by a program to instruct the relevant hardware, and the program may be stored in a computer-readable storage medium, which may be a read-only memory, a disk, or an optical disk, etc.

[0111] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A method for determining the construction of a pipe jacking under a highway, characterized in that: For use in an area to be constructed, where there is a highway, the method comprises: Obtaining geological parameters of the area to be constructed, wherein the geological parameters indicate that the area to be constructed includes a brecciated layer, a silty clay layer, and a sandy gravel layer sequentially arranged downward along the surface, the highway is located on the brecciated layer, and the width of the highway is 28 meters; Based on general geotechnical finite element calculation software and the geological parameters, a modified Mohr-Coulomb constitutive model of the area to be constructed is obtained, wherein the soil is formed using a tetrahedral solid unit structure, the jacking pipe is a two-dimensional shell unit, and the bottom of the modified Mohr-Coulomb constitutive model adopts a fixed constraint and the side adopts a fixed normal displacement constraint; Acquire multiple pipe jacking parameter groups, and input the multiple pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain an influencing parameter of the area to be constructed corresponding to each pipe jacking parameter group in the multiple pipe jacking parameter groups, wherein the influencing parameter is a ratio of a size of a settlement area to a diameter of the pipe jacking when pipe jacking construction is performed based on the pipe jacking parameter group, each pipe jacking parameter group includes three parameters of the pipe jacking: thickness, diameter, and strength, and any two pipe jacking parameter groups have one parameter different from the other of the three parameters; Based on the influencing parameters of the plurality of areas to be constructed corresponding to the plurality of pipe jacking parameter groups, a target pipe jacking parameter group including a target thickness, a target diameter and a target strength of the pipe jacking is determined.

2. The method according to claim 1, characterized in that The top of the modified Mohr-Coulomb constitutive model is a free surface, the length of the jacking pipe is 8 meters, and when the modified Mohr-Coulomb constitutive model is used to simulate the construction of the jacking pipe, the working conditions of the jacking pipe construction include twelve working conditions: initial stress field analysis, installation of the jacking pipe, the first jacking, and the second to tenth jacking. Before acquiring a plurality of pipe jacking parameter groups and inputting the plurality of pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain an influencing parameter of the to-be-constructed area corresponding to each of the plurality of pipe jacking parameter groups, the method further includes: Inputting the initial pipe jacking parameter group into the modified Mohr-Coulomb constitutive model to simulate the pipe jacking construction, and obtaining a first influencing parameter for each of the twelve working conditions during the pipe jacking construction, wherein the first influencing parameter is a ratio of a size of a settlement area to a diameter of the pipe jacking when the pipe jacking construction is performed based on the initial pipe jacking parameter group; determining, among the first influencing parameters of the twelve operating conditions, a plurality of target operating conditions whose first influencing parameters are greater than a preset influencing parameter threshold; The step of obtaining a plurality of pipe jacking parameter groups, inputting the plurality of pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model, and obtaining an influencing parameter of the to-be-constructed area corresponding to each of the plurality of pipe jacking parameter groups, includes: A plurality of pipe jacking parameter groups are obtained, and the plurality of pipe jacking parameter groups are respectively input into the modified Mohr-Coulomb constitutive model to obtain an influencing parameter of each of the plurality of target working conditions in the area to be constructed corresponding to each pipe jacking parameter group in the plurality of pipe jacking parameter groups.

3. The method according to claim 2, characterized in that The step of obtaining a plurality of pipe jacking parameter groups and inputting the plurality of pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain an influencing parameter of the area to be constructed corresponding to each of the plurality of target working conditions under each of the plurality of target working conditions includes: Acquire five first pipe jacking parameter groups, wherein any one of the first pipe jacking parameter groups includes the thickness, diameter, and strength of the pipe jacking, and the parameters in the five first pipe jacking parameter groups except the thickness of the pipe jacking are the same; Inputting the five first pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, and obtaining thickness influencing parameters of the five first pipe jacking parameter groups in the multiple target working conditions respectively, wherein the thickness influencing parameters are the ratios of the size of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is performed based on the first pipe jacking parameter groups; The determining of a target pipe jacking parameter group including a target thickness, a target diameter, and a target strength of the pipe jacking based on the influencing parameters of the plurality of areas to be constructed corresponding to the plurality of pipe jacking parameter groups comprises: The thickness of the jacking pipe in the first jacking pipe parameter group having the smallest thickness influencing parameter among the five first jacking pipe parameter groups in the multiple target working conditions is determined as the target thickness of the jacking pipe.

4. The method according to claim 3, characterized in that In the five 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.

5. The method according to claim 2, characterized in that The step of obtaining a plurality of pipe jacking parameter groups and inputting the plurality of pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain an influencing parameter of the area to be constructed corresponding to each of the plurality of target working conditions under each of the plurality of target working conditions includes: Acquire five second pipe jacking parameter groups, wherein any one of the second pipe jacking parameter groups includes the thickness, diameter, and strength of the pipe jacking, and the parameters of the five second pipe jacking parameter groups except the diameter of the pipe jacking are the same; Inputting the five second pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, and obtaining diameter influence parameters of the five second pipe jacking parameter groups in the multiple target working conditions respectively, wherein the diameter influence parameters are the ratios of the size of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is performed based on the second pipe jacking parameter groups; The determining of a target pipe jacking parameter group including a target thickness, a target diameter, and a target strength of the pipe jacking based on the influencing parameters of the plurality of areas to be constructed corresponding to the plurality of pipe jacking parameter groups comprises: The diameter of the jacking pipe in the second jacking pipe parameter group having the smallest diameter influencing parameter among the five second jacking pipe parameter groups in the multiple target working conditions is determined as the target diameter of the jacking pipe.

6. The method according to claim 5, characterized in that In the five second pipe jacking parameter groups, the pipe jacking diameters are 0.5D0, 0.75D0, 1.0D0, 1.2D0 and 1.50D0 respectively, and D0 is the diameter of the pipe jacking in the initial pipe jacking parameter group.

7. The method according to claim 2, characterized in that The step of obtaining a plurality of pipe jacking parameter groups and inputting the plurality of pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively to obtain an influencing parameter of the area to be constructed corresponding to each of the plurality of target working conditions under each of the plurality of target working conditions includes: Acquire five third pipe jacking parameter groups, any one of the third pipe jacking parameter groups includes the thickness, diameter, and strength of the pipe jacking, and all parameters in the five third pipe jacking parameter groups except the strength of the pipe jacking are the same; Inputting the five third pipe jacking parameter groups into the modified Mohr-Coulomb constitutive model respectively, and obtaining strength influencing parameters of the five third pipe jacking parameter groups in the multiple target working conditions respectively, wherein the strength influencing parameters are ratios of the size of the settlement area to the diameter of the pipe jacking when the pipe jacking construction is performed based on the third pipe jacking parameter group; The determining of a target pipe jacking parameter group including a target thickness, a target diameter, and a target strength of the pipe jacking based on the influencing parameters of the plurality of areas to be constructed corresponding to the plurality of pipe jacking parameter groups comprises: The strength of the jacking pipe in the third jacking pipe parameter group having the smallest strength influencing parameter among the five third jacking pipe parameter groups in the multiple target working conditions is determined as the target strength of the jacking pipe.

8. The method according to claim 7, characterized in that In the five 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 area to be constructed, the jacking pipe includes a jacking pipe sleeve and a jacking pipe section, and the jacking pipe sleeve and the jacking pipe section are both shell elements. The jacking pipe sleeve has a weight of 78 kN per cubic meter, an elastic modulus of 210 MPa, a Poisson's ratio of 0.20, and a thickness of 0.02 meter. The jacking pipe section has a weight of 25 kN per cubic meter, an elastic modulus of 30 MPa, a Poisson's ratio of 0.25, and a thickness of 0.275 meter. The modified Mohr-Coulomb constitutive model of the area to be constructed has a size of 80 meters in the first direction, a size of 40 meters in the second direction, and a height of 40 meters. The first direction is a direction perpendicular to the length direction of the highway and parallel to the horizontal plane, and the second direction is a direction 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 units and 25,508 nodes. The coupling effect between the concrete of the jacking pipe and the surrounding rock and soil is simulated by setting the interface unit with a strength reduction coefficient of 0.7 between the rock and soil bodies, and the pipe segment shrinkage rate of the jacking pipe is set to simulate the soil loss during the jacking pipe construction.

10. A construction determination device for a pipe jacking under a highway, characterized in that: Used in an area to be constructed, where there is a highway, the device for determining whether the jacking pipe passes under the highway comprises: a parameter acquisition module, configured to acquire geological parameters of the area to be constructed, wherein the geological parameters indicate that the area to be constructed includes a brecciated layer, a silty clay layer, and a sandy gravel layer sequentially arranged downward along the surface, the highway is located on the brecciated layer, and the width of the highway is 28 meters; a model determination module, configured to obtain a modified Mohr-Coulomb constitutive model of the area to be constructed based on general geotechnical finite element calculation software and the geological parameters, wherein the soil body is formed using a tetrahedral solid unit structure in the modified Mohr-Coulomb constitutive model; 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, to obtain an influencing parameter of the area to be constructed corresponding to each of the plurality of pipe jacking parameter groups, wherein the influencing parameter is a ratio of a size of a settlement area to a diameter of the pipe jacking when pipe jacking construction is performed based on the pipe jacking parameter group, wherein each pipe jacking parameter group includes three parameters of the pipe jacking: thickness, diameter, and strength, and any two pipe jacking parameter groups have one parameter different from the other of the three parameters; The target parameter determination module is used to determine a target pipe jacking parameter group including a target thickness, a target diameter and a target strength of the pipe jacking based on the influencing parameters of the multiple areas to be constructed corresponding to the multiple pipe jacking parameter groups.

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