CN115130344B - Tunnel jacking method tunnel entering construction numerical simulation method based on explicit dynamics - Google Patents
Tunnel jacking method tunnel entering construction numerical simulation method based on explicit dynamics Download PDFInfo
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- CN115130344B CN115130344B CN202210729354.4A CN202210729354A CN115130344B CN 115130344 B CN115130344 B CN 115130344B CN 202210729354 A CN202210729354 A CN 202210729354A CN 115130344 B CN115130344 B CN 115130344B
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Abstract
The invention discloses a tunnel jacking method tunnel entering construction numerical simulation method based on explicit dynamics, which comprises the steps of firstly, establishing an ABAQUS finite element model of tunnel jacking method tunnel entering construction; then, a unit deletion algorithm based on time and space is compiled; finally, calling a unit deletion algorithm based on time and space to calculate a tunnel construction numerical value; and analyzing the calculation result. The method can effectively simulate the dynamic process of jacking and then excavating in the tunnel jacking method tunnel entering construction, solves the problem that the tunnel jacking method tunnel entering construction can not be simulated by using the display dynamics simulation tunnel jacking method, and can provide reference for the simulation of related construction technology.
Description
Technical Field
The invention relates to the technical field of tunnel entering jacking method construction, in particular to a tunnel entering jacking method tunnel entering construction numerical simulation method based on explicit dynamics.
Background
Along with the gradual improvement of engineering environmental protection awareness of people. In tunnel entrance engineering, a large brushing slope is often accompanied, and the tunnel entrance environment is greatly damaged. For areas with proper climates, the tunnel portal environment can be recovered quickly, but for areas with severe climates, the tunnel portal environment is extremely difficult to recover, such as a CZ line tunnel, a mountain deep cutting canyon is traversed, the tunnel portal topography and landform are complex, and unstable accumulation bodies, moraine bodies, landslide bodies, falling rocks and the like exist at the tunnel portal section. Reducing the influence of hole entering construction on the environment as much as possible becomes an important problem. The jacking method can well protect the environment, the existing construction of simulating the tunnel jacking method by using display dynamics has the problem that the excavation cannot be simulated, and how to effectively simulate the process of jacking and then excavating in the tunnel jacking method tunnel jacking construction becomes a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a tunnel jacking method tunnel entering construction numerical simulation method based on explicit dynamics, which can effectively simulate a dynamic process of jacking and then excavating in tunnel jacking method tunnel entering construction, solves the problem that the tunnel jacking method tunnel entering construction cannot be simulated by using display dynamics simulation, and can provide reference for relevant construction technology simulation.
In order to achieve the above object, the present invention provides the following solutions:
a tunnel jacking method tunnel entering construction numerical simulation method based on explicit dynamics comprises the following steps:
s1, building an ABAQUS finite element model for tunnel construction by a tunnel jacking method;
s2, compiling a unit deletion algorithm based on time and space;
s3, calling a unit deletion algorithm based on time and space to calculate a construction numerical value of the tunnel;
s4, analyzing the calculation result.
Further, in the step S1, an ABAQUS finite element model of the tunnel jacking method hole entering construction is established, which includes component establishment, attribute assignment, component assembly, analysis step setting, contact setting, boundary condition setting, and grid division.
Further, the steps of component establishment, attribute assignment, component assembly, analysis step setting, contact setting, boundary condition setting and grid division are as follows:
establishing a three-dimensional geometric model of a rock-soil body and a jacking pipe in the component;
endowing the rock-soil body and the jacking pipe with corresponding attributes;
assembling a rock-soil body and a jacking pipe and adjusting to a proper direction;
setting the analysis step to display dynamics;
setting the contact attribute of the jacking pipe and the rock-soil body as the contact or general contact of the jacking pipe surface and the rock-soil body node;
setting a boundary according to a semi-infinite space, applying a speed boundary condition in the jacking direction of the jacking pipe, and restraining vertical displacement at the bottom;
dividing a rock-soil body and a jacking pipe grid, and setting the attribute of the rock-soil body grid as follows: when the cell strain of the rock-soil body reaches 0.1, the cell is converted into particles.
Further, the step S2 specifically includes:
writing a VUSDFLD subroutine in an ABAQUS finite element model by using the FORTRAN language, recording the calculation time at the moment after the jacking pipe is jacked to a specified depth according to a preset speed, judging whether a rock-soil body unit is positioned in the jacking pipe or not when the calculation time is greater than the calculation time, and deleting the unit if the rock-soil body unit is positioned in the jacking pipe;
if the rock-soil body unit is not in the jacking pipe, returning to the previous step, and continuously judging whether the next unit is in the jacking pipe or not until all units in the jacking pipe are deleted, and completing excavation, so that the purposes of jacking the jacking pipe and then excavating the soil body are achieved.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects: the method for simulating the tunnel jacking method hole entering construction numerical value based on explicit dynamics mainly comprises 2 parts of ABAQUS numerical model establishment and unit deletion algorithm based on time and space, can effectively simulate the dynamic process of jacking and then excavating in the tunnel jacking method hole entering construction, and solves the problem that the tunnel jacking method hole entering construction simulated by using explicit dynamics cannot simulate excavation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a tunnel jacking method tunnel entering construction numerical simulation method based on explicit dynamics according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a point location of a unit deletion algorithm based on time and space according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a model of an embodiment of the present invention;
reference numerals illustrate: 1. a rock-soil body; 2. a rock-soil body to be excavated; 3. jacking pipes; 4. excavating a front model; 5. jacking and then excavating the post-effect model.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide a tunnel jacking method tunnel entering construction numerical simulation method based on explicit dynamics, which can effectively simulate a dynamic process of jacking and then excavating in tunnel jacking method tunnel entering construction, and solves the problem that the tunnel jacking method tunnel entering construction can not simulate excavation by using display dynamics simulation.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
As shown in fig. 1 to 2, the tunnel jacking method tunnel entering construction numerical simulation method based on explicit dynamics provided by the invention comprises the following steps:
s1, an ABAQUS finite element model of tunnel jacking method tunnel entering construction is established, wherein the ABAQUS finite element model comprises component establishment, attribute giving, component assembling, analysis step setting, contact setting, boundary condition setting and grid division, and the method comprises the following specific steps:
establishing a three-dimensional geometric model of a rock-soil body and a jacking pipe in the component;
endowing the rock-soil body and the jacking pipe with corresponding attributes;
assembling a rock-soil body and a jacking pipe and adjusting to a proper direction;
setting the analysis step to display dynamics;
setting the contact attribute of the jacking pipe and the rock-soil body as the contact or general contact of the jacking pipe surface and the rock-soil body node;
setting a boundary according to a semi-infinite space, applying a speed boundary condition in the jacking direction of the jacking pipe, and restraining vertical displacement at the bottom;
dividing a rock-soil body and a jacking pipe grid, and setting the attribute of the rock-soil body grid as follows: when the strain of the rock-soil body unit reaches 0.1, the unit is converted into particles;
s2, compiling a unit deletion algorithm based on time and space, which specifically comprises the following steps:
writing a VUSDFLD subroutine in ABAQUS by using the FORTRAN language, recording the calculation time at the moment after the jacking pipe is jacked to a specified depth according to a preset speed, judging whether a rock-soil body unit is positioned in the jacking pipe or not when the calculation time is greater than the calculation time, and deleting the unit if the rock-soil body unit is positioned in the jacking pipe;
if the rock-soil body unit is not in the jacking pipe, returning to the previous step, and continuously judging whether the next unit is in the jacking pipe or not until all units in the jacking pipe are deleted, and finishing excavation, so that the purposes of jacking the jacking pipe and then excavating the soil body are achieved;
s3, calling a unit deletion algorithm based on time and space to calculate a construction numerical value of the tunnel;
s4, analyzing the calculation result.
Taking a three-center circular tunnel as an example, a finite element model, such as a model 4 before excavation in fig. 3, is firstly established, wherein the model comprises a rock-soil body 1, a rock-soil body 2 to be excavated and a jacking pipe 3; then, a unit deleting algorithm based on time and space is compiled, and the algorithm specifically judges that:
wherein t1 is the time taken for the jacking pipe to be jacked to a preset depth according to a certain speed, and z1 is the preset depth. The rest parameters are space azimuth control points, and are shown in figure 2.
Finally, when a calculation task is created, a unit deletion algorithm based on time and space is selected to be called for calculation, and the vertical displacement result is shown as a jacking-first and excavation-last effect model 5 in fig. 3, so that the purpose of jacking a jacking pipe to a preset depth and then excavating soil is achieved.
In summary, the tunnel jacking method tunnel entering construction numerical simulation method based on explicit dynamics provided by the invention mainly comprises 2 parts of ABAQUS numerical model establishment and unit deletion algorithm based on time and space, and can effectively simulate the dynamic process of jacking and then excavating in tunnel jacking construction, thereby solving the problem that the tunnel entering construction can not simulate excavation by using the explicit dynamics simulation tunnel jacking method.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (1)
1. A tunnel jacking method tunnel entering construction numerical simulation method based on explicit dynamics is characterized by comprising the following steps:
s1, an ABAQUS finite element model of tunnel jacking method tunnel entering construction is established, wherein the ABAQUS finite element model comprises component establishment, attribute giving, component assembling, analysis step setting, contact setting, boundary condition setting and grid division, and the method comprises the following specific steps:
establishing a three-dimensional geometric model of a rock-soil body and a jacking pipe in the component;
endowing the rock-soil body and the jacking pipe with corresponding attributes;
assembling a rock-soil body and a jacking pipe and adjusting to a proper direction;
setting the analysis step to display dynamics;
setting the contact attribute of the jacking pipe and the rock-soil body as the contact or general contact of the jacking pipe surface and the rock-soil body node;
setting a boundary according to a semi-infinite space, applying a speed boundary condition in the jacking direction of the jacking pipe, and restraining vertical displacement at the bottom;
dividing a rock-soil body and a jacking pipe grid, and setting the attribute of the rock-soil body grid as follows: when the strain of the rock-soil body unit reaches 0.1, the unit is converted into particles;
s2, compiling a unit deletion algorithm based on time and space; the method specifically comprises the following steps:
writing a VUSDFLD subroutine in an ABAQUS finite element model by using the FORTRAN language, recording the calculation time at the moment after the jacking pipe is jacked to a specified depth according to a preset speed, judging whether a rock-soil body unit is positioned in the jacking pipe or not when the calculation time is greater than the calculation time, and deleting the unit if the rock-soil body unit is positioned in the jacking pipe;
if the rock-soil body unit is not in the jacking pipe, returning to the previous step, and continuously judging whether the next unit is in the jacking pipe or not until all units in the jacking pipe are deleted, and finishing excavation, so that the purposes of jacking the jacking pipe and then excavating the soil body are achieved;
s3, calling a unit deletion algorithm based on time and space to calculate a construction numerical value of the tunnel;
s4, analyzing the calculation result.
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