CN102561395B - Three-dimensional fine modeling method oriented to immersed tube tunnel seismic design - Google Patents
Three-dimensional fine modeling method oriented to immersed tube tunnel seismic design Download PDFInfo
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- CN102561395B CN102561395B CN201210055548.7A CN201210055548A CN102561395B CN 102561395 B CN102561395 B CN 102561395B CN 201210055548 A CN201210055548 A CN 201210055548A CN 102561395 B CN102561395 B CN 102561395B
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Abstract
The invention discloses a three-dimensional fine modeling method for an immersed tube tunnel. The method comprises the following steps of: performing structural analysis on the immersed tube tunnel to determine the part needing modeling; defining a node on the axis of the immersed tube tunnel model; defining a unit required by the immersed tube tunnel model; defining material properties and interface attributes; defining the constraint relationship between the node simulating the joint part and the endpoint of the tube section; and assembling the components into an immersed tube tunnel model for calculation and analysis. The method disclosed by the invention can simulate the joint initial compression produced by water-power compression joint in the construction of the immersed tube tunnel, accurately calculates the stress and opening amount of the joint, and realizes the fine calculation of the joint part. The method disclosed by the invention sufficiently considers the requirement of analysis accuracy, meets the requirement on the calculation efficiency, and has good engineering practicability.
Description
Technical field
The invention belongs to submerged tunnel engineering field, relate to the modeling method that can be used for immersed tube tunnel seismic design.
Background technology
Immersed tunnelling method is a kind of novel construction method of building submerged tunnel growing up 20 beginnings of the century.Due to its unique advantage, immersed tunnelling method has become the first-selected engineering method that submerged tunnel is built in recent years.In longitudinal aseismic analysis of immersed tube tunnel, whether the three dimensional analysis model of setting up is suitable, relates to the efficiency of calculating and the reliability of result, and therefore reasonably immersed tube tunnel threedimensional model is very important to aseismic analysis.
Adopted spring-quality model for the model of immersed tube tunnel aseismic analysis, indivedual engineerings have adopted the full three-dimensional model that becomes more meticulous more in the past.Joints in Immersed Tunnel position is because rigidity is less than tube coupling, the weak part in tunnel often, it is stressed, deformation is the part of paying close attention in engineering, and especially the performance of construction measure under geological process such as Gina waterstop and shear key directly affects the safety in tunnel.Gina waterstop is elastic material, for guaranteeing that its watertightness need meet the requirement of minimal compression amount.Under geological process, along with the distortion of joint, decrement likely reduces, and causes sealing to lose efficacy.Shear key is the main anti-seismic construction of joint area, and it is stressed is directly connected to the shock resistance in tunnel with distortion.Adopted spring-quality model for the model of immersed tube tunnel aseismic analysis, indivedual engineerings have adopted the full three-dimensional model that becomes more meticulous more in the past.Although spring-quality model amount of calculation is little, the simulation of butt joint is more coarse, and Anti-pull-press, bending resistance, shearing resistance, simply respectively with a spring simulation, cannot be calculated the true decrement and the amount of opening of Gina waterstop, also cannot analyze the stressing conditions of shear key.This model cannot be considered the body slippage that in construction, waterpower crimping produces, and consequent joint initial compression amount, this will cause in follow-up aseismic analysis the important controlled conditions such as the amount of opening that cannot accurate Calculation joint, and this model also cannot calculate tunnel and the issuable slip of the soil body under geological process simultaneously.Therefore, spring-quality model is not suitable for the accurate Calculation of joint area.That although full three-dimensional becomes more meticulous, model can Analysis on accurate calculation tunnel joint area is stressed, be out of shape and open, and assesses the cost too high, is unsuitable for the computational analysis in century engineering.
Summary of the invention
Cannot simulate for existing spring-quality model that the deficiency of immersed tube tunnel waterpower crimping, existing spring-quality model are cannot accurate Calculation joint area stressed cannot simulate the not enough of shear key and Gina waterstop and the three-dimensional model too high drawback that assesses the cost that becomes more meticulous entirely with deficiency, existing spring-quality model amount of opening, the object of the present invention is to provide a kind of immersed tube tunnel Simplified Three-dimensional modeling method.
For solving the problems of the technologies described above, technical scheme of the present invention comprises the following steps:
Further, step 1 comprises: determine the geometric position of its axis, the buried depth in tunnel, and the distribution of soil layer around, getting the tunnel segment of intending with the construction of sunken tube method is modeling scope.
In step 2, node comprises three parts: node on tube coupling axis, for simulating the ground spring of soil body behavior and the node of sticky kettle and the tube coupling end node along cross section girth, on tube coupling axis, the quantity of node is relevant with the physical dimension of beam element that characterizes tube coupling.
Described in step 3, unit comprises: for simulate tube coupling beam element, simulation Gina waterstop nonlinear spring unit, for spring and the sticky kettle unit of simulating the soil body, the sliding unit contacting with the soil body for simulation tunnel, for simulating the spring unit of shear key.
In step 5: node and this tube coupling endpoint node along joint circumferential direction are set to Rigid Constraints, keep these nodes not produce relative displacement.
Further, a kind of modeling method for immersed tube tunnel seismic design, comprising:
1) simulation of tube coupling: on the basis of the defined immersed tube tunnel tube coupling of step 2 axis node by discrete tube coupling be three-dimensional linear beam element, i.e. the three-dimensional linear beam element of the end points take adjacent two nodes on each tube coupling axis as unit definition;
2) simulation of tube coupling joint: a) simulation of Gina waterstop: with the effect of some nonlinear spring unit simulation Gina waterstops, the node of each tube coupling end along cross section girth has been set in step 2, corresponding node take tube coupling end, joint both sides along cross section girth, as cell terminals, will be defined as nonlinear spring unit between every pair of node;
B) simulation of shear key: the actual arrangement position according to each shear key at joint, find out the corresponding node of joint both sides tube coupling end face along the node of girth, the definition Cartesian linkage unit take every pair of corresponding node as cell terminals; If this unit should define the shear key rigidity of horizontal direction in this unit for dummy level shear key; If vertically shear key defines corresponding vertically shear key rigidity; Also there is numerical value shear key if propose the tunnel of meter at middle part, joint cross section, adopt equally the method the node of shear key to be set and between corresponding node, to define Descartes's linkage unit according to concrete geometric position;
3) simulation of the soil body: take the node of unit of the simulation soil body behavior of definition in step 2 as end points, three directions define respectively spring unit in parallel and sticky kettle unit in space, simulates the behavior of the soil body with this;
4) the interactional simulation in the soil body-tunnel: take the node near tube coupling side of the unit of node on tube coupling axis and the simulation soil body behavior corresponding with its position as cell terminals definition Cartesian & Cardan linkage unit, except along the longitudinal degree of freedom of tunnel level, all the other degree of freedom are all set to rigidity, the friction factor in the suitable soil body-tunnel is longitudinally set in level, the direction of normal force is defined as vertical direction, and this unit allows tube coupling under waterpower crimping and geological process, to produce possible longitudinal sliding motion;
1) material constant such as modulus of elasticity, poisson's ratio of joint material is set;
2) by the parameter such as area, moment of inertia, the product of inertia, torsion constant and the shear center position to centre of form axle in calculative determination tube coupling cross section;
3) adopt suitable theoretical calculative determination for simulating spring-sticky kettle unit medi-spring in parallel and the sticky kettle coefficient separately of soil body behavior;
4) determine power-decrement non-linear relation curve of Gina material;
The present invention has made up the deficiency of above-mentioned two models, the joint initial compression that can simulate immersed tube tunnel construction time, waterpower crimping produces, the stressed and amount of opening of accurate Calculation joint.This invention center tap Gina waterstop is modeled as some springs of arranging along perimeter, and shear key is modeled as the spring of relevant position, has realized the calculating that becomes more meticulous at butt joint position.The present invention had both taken into full account the required precision of analyzing, and had met again the requirement of computational efficiency aspect, had good engineering practicability.
Accompanying drawing explanation
Fig. 1 is the three-dimensional fine modeling method flow chart of the immersed tube tunnel seismic design of example of the present invention.
Fig. 2 is the 3-D view of example of the present invention for immersed tube tunnel seismic design model.
Fig. 3 is the 3-D view of immersed tube tunnel tube coupling Connector Model.
Attached number in the figure explanation:
1-immersed tube tunnel tube coupling; 2-ground spring; 3-glues kettle; 4-sliding unit; 5-shear key; 6-Gina waterstop; 7-joint left side tube coupling; 8-joint right side tube coupling; 9-left side tube coupling right endpoint; 10-right side tube coupling left end point; 11-shear key left node; 12-shear key right side node; 13-is rigidly connected
The specific embodiment
Below in conjunction with drawings and Examples, take common finite element program-ABAQUS as basis, the specific embodiment of the present invention is described in further detail.
As shown in Figure 1, this immersed tube tunnel model comprises the parts such as tube coupling 1, ground spring 2, sticky kettle 3, sliding unit 4, shear key 5, Gina waterstop 6.
1) simulation of tube coupling: as shown in Figure 1, on the basis of the defined immersed tube tunnel tube coupling of step 2 axis node by discrete tube coupling be three-dimensional linear beam element, i.e. the three-dimensional linear beam element of the end points take adjacent two nodes on each tube coupling axis as unit definition;
2) simulation of tube coupling joint: a) simulation of Gina waterstop: with the effect of some nonlinear spring unit simulation Gina waterstops.As shown in Figure 1, 2, the node of each tube coupling end along cross section girth has been set in step 2, the corresponding node take tube coupling end, joint both sides along cross section girth, as cell terminals, will be defined as nonlinear spring unit between every pair of node;
B) simulation of shear key: as shown in Figure 2, shear key is joint area another main member except Gina waterstop.Actual arrangement position according to each shear key at joint, finds out the corresponding node of joint both sides tube coupling end face along the node of girth, definition Cartesian (Descartes unit) linkage unit take every pair of corresponding node as cell terminals.If this unit, for dummy level shear key, should define the shear key rigidity of horizontal direction in this unit; As defined corresponding vertically shear key rigidity for vertical shear key.As also there is numerical value shear key in the tunnel that proposes meter at middle part, joint cross section, adopt equally the method the node of shear key to be set and between corresponding node, to define Descartes's linkage unit according to concrete geometric position.
3) simulation of the soil body: as shown in Figure 1, take the node of unit of the simulation soil body behavior of definition in step 2 as end points, three directions define respectively spring unit in parallel and sticky kettle unit in space, simulates the behavior of the soil body with this;
4) the interactional simulation in the soil body-tunnel: as shown in Figure 1, take the node near tube coupling side of the unit of node on tube coupling axis and the simulation soil body behavior corresponding with its position as cell terminals definition Cartesian & Cardan (Descartes unit and universal joint unit) linkage unit.Except along the longitudinal degree of freedom of tunnel level, all the other degree of freedom are all set to rigidity.The friction factor in the suitable soil body-tunnel is longitudinally set in level, and the direction of normal force is defined as vertical direction.This unit allows tube coupling under waterpower crimping and geological process, to produce possible longitudinal sliding motion;
1) material constant such as modulus of elasticity, poisson's ratio of joint material is set;
2) by the parameter such as area, moment of inertia, the product of inertia, torsion constant and the shear center position to centre of form axle in calculative determination tube coupling cross section.
3) adopt suitable theoretical calculative determination for simulating spring-sticky kettle unit medi-spring in parallel and the sticky kettle coefficient separately of soil body behavior;
4) determine power-decrement non-linear relation curve of Gina material;
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.Person skilled in the art obviously can easily make various modifications to these embodiment, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not departing from the improvement that category of the present invention makes and revise all should be within protection scope of the present invention.
Claims (5)
1. for a modeling method for immersed tube tunnel seismic design, it is characterized in that: comprising:
Step 1, carries out structural analysis to immersed tube tunnel, determines and needs modeling part;
Step 2, defines the node on this immersed tube tunnel model axis;
Step 3, defines this immersed tube tunnel model and needs unit;
Step 4, definition material property, interface property;
Step 5, the restriction relation between node and this tube coupling end points of definition simulation joint area;
Step 6, is immersed tube tunnel model by above-mentioned each assembling parts, and for computational analysis;
Step 1 comprises: determine the geometric position of its axis, the buried depth in tunnel, and the distribution of soil layer around, getting the tunnel segment of intending with the construction of sunken tube method is modeling scope;
In step 2, node comprises three parts: node on tube coupling axis, for simulating the ground spring of soil body behavior and the node of sticky kettle and the tube coupling end node along cross section girth, on tube coupling axis, the quantity of node is relevant with the physical dimension of beam element that characterizes tube coupling.
2. the modeling method for immersed tube tunnel seismic design according to claim 1, is characterized in that: described in step 3, unit comprises: for simulate tube coupling beam element, simulation Gina waterstop nonlinear spring unit, for spring and the sticky kettle unit of simulating the soil body, the sliding unit contacting with the soil body for simulation tunnel, for simulating the spring unit of shear key.
3. the modeling method for immersed tube tunnel seismic design according to claim 1, it is characterized in that: step 4 comprises: modulus of elasticity, the poisson's ratio of setting tube coupling material, determine cross dimension, the parameter of soil spring, sticky kettle, shear key, Gina waterstop is set.
4. the modeling method for immersed tube tunnel seismic design according to claim 1, is characterized in that: in step 5: node and this tube coupling endpoint node along joint circumferential direction are set to Rigid Constraints, keep these nodes not produce relative displacement.
5. the modeling method for immersed tube tunnel seismic design according to claim 1, is characterized in that: comprising:
Step 1, the tunnel structure that proposes meter is carried out to structural analysis, comprise: determine the geometric position of its axis, the buried depth in tunnel, the distribution of soil layer around, getting the tunnel segment of intending with the construction of sunken tube method is modeling scope, and this immersed tube tunnel model comprises tube coupling, ground spring, sticky kettle, sliding unit, Gina waterstop, shear key;
Step 2, define the control node of this immersed tube tunnel model, control node and comprise three parts: node on tube coupling axis, for simulating the ground spring of soil body behavior and the node of sticky kettle and the tube coupling end node along cross section girth, on tube coupling axis, the quantity of node is relevant with the physical dimension of the beam element of sign tube coupling;
Step 3, definition is for simulating the unit of this immersed tube tunnel;
1) simulation of tube coupling: on the basis of the defined immersed tube tunnel tube coupling of step 2 axis node by discrete tube coupling be three-dimensional linear beam element, i.e. the three-dimensional linear beam element of the end points take adjacent two nodes on each tube coupling axis as unit definition;
2) simulation of tube coupling joint: a) simulation of Gina waterstop: with the effect of some nonlinear spring unit simulation Gina waterstops, the node of each tube coupling end along cross section girth has been set in step 2, corresponding node take tube coupling end, joint both sides along cross section girth, as cell terminals, will be defined as nonlinear spring unit between every pair of node;
B) simulation of shear key: the actual arrangement position according to each shear key at joint, find out the corresponding node of joint both sides tube coupling end face along the node of girth, the definition Cartesian linkage unit take every pair of corresponding node as cell terminals; If this unit should define the shear key rigidity of horizontal direction in this unit for dummy level shear key; If vertically shear key defines corresponding vertically shear key rigidity; Also there is vertical shear key if propose the tunnel of meter at middle part, joint cross section, adopt equally the method the node of shear key to be set and between corresponding node, to define Descartes's linkage unit according to concrete geometric position;
3) simulation of the soil body: take the node of unit of the simulation soil body behavior of definition in step 2 as end points, three directions define respectively spring unit in parallel and sticky kettle unit in space, simulates the behavior of the soil body with this;
4) the interactional simulation in the soil body-tunnel: take the node near tube coupling side of the unit of node on tube coupling axis and the simulation soil body behavior corresponding with its position as cell terminals definition Cartesian & Cardan linkage unit, except along the longitudinal degree of freedom of tunnel level, all the other degree of freedom are all set to rigidity, the friction factor in the suitable soil body-tunnel is longitudinally set in level, the direction of normal force is defined as vertical direction, and this unit allows tube coupling under waterpower crimping and geological process, to produce possible longitudinal sliding motion;
Step 4, definition material property, interface property;
1) material constant such as modulus of elasticity, poisson's ratio of joint material is set;
2) by the parameter such as area, moment of inertia, the product of inertia, torsion constant and the shear center position to centre of form axle in calculative determination tube coupling cross section;
3) adopt suitable theoretical calculative determination for simulating spring-sticky kettle unit medi-spring in parallel and the sticky kettle coefficient separately of soil body behavior;
4) determine power-decrement non-linear relation curve of Gina material;
Step 5, definition restriction relation: by the node along joint circumferential direction, comprise each shear key corresponding node, be set to Rigid Constraints with this joint endpoint node, keep these nodes without relative displacement; The described node along joint circumferential direction comprises each shear key corresponding node;
Step 6, is immersed tube tunnel model by above-mentioned each assembling parts, and for computational analysis.
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| CN103792139B (en) * | 2012-10-29 | 2016-01-20 | 同济大学 | A kind of measuring method of Joints in Immersed Tunnel bendind rigidity |
| CN103912016B (en) * | 2012-12-31 | 2016-02-03 | 中交一航局第二工程有限公司 | A kind of tube coupling drawing compression bonding method |
| CN105069195B (en) * | 2015-07-21 | 2018-03-27 | 深圳市置华机电设备有限公司 | A kind of electromechanical antidetonation Deepen Design method and system |
| CN108385727B (en) * | 2018-02-05 | 2020-02-14 | 山东大学 | Method for calculating reasonable buried depth of submarine tunnel constructed by immersed tube method |
| CN112084610A (en) * | 2020-08-31 | 2020-12-15 | 广船国际有限公司 | Immersed tube tunnel pipe joint pre-carrying method, device, equipment and storage medium |
| CN112064680A (en) * | 2020-08-31 | 2020-12-11 | 广船国际有限公司 | Manufacturing method of immersed tunnel steel shell pipe joint and immersed tunnel steel shell pipe joint |
| CN112632659A (en) * | 2020-12-08 | 2021-04-09 | 株洲时代新材料科技股份有限公司 | Analysis method for GINA waterstop for immersed tunnel |
| CN112632837B (en) * | 2020-12-31 | 2024-05-14 | 华中科技大学 | Method for determining longitudinal earthquake-resistant numerical value of underground structure |
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