CN113240548B - Region dividing method and device - Google Patents

Region dividing method and device Download PDF

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Publication number
CN113240548B
CN113240548B CN202110502463.8A CN202110502463A CN113240548B CN 113240548 B CN113240548 B CN 113240548B CN 202110502463 A CN202110502463 A CN 202110502463A CN 113240548 B CN113240548 B CN 113240548B
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pier
pile
bridge
model
height
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CN113240548A (en
Inventor
黄帅
刘英杰
齐庆杰
周洋
牟犇
姚国专
吕悦军
修立伟
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Zunyi Survey And Design Institute Of Water Conservancy And Hydropower
Qingdao University of Technology
Institute of Disaster Prevention
National Institute of Natural Hazards
General Coal Research Institute Co Ltd
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Zunyi Survey And Design Institute Of Water Conservancy And Hydropower
Qingdao University of Technology
Institute of Disaster Prevention
National Institute of Natural Hazards
General Coal Research Institute Co Ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/08—Construction
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/13—Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F30/00—Computer-aided design [CAD]
    • G06F30/20—Design optimisation, verification or simulation
    • G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]

Abstract

The application provides a region dividing method and device, wherein the method comprises the following steps: acquiring the pile height near the bridge pier; obtaining a pre-stored region division rule, wherein the region division rule comprises conditions to be met by the proximity distance between the stacking and the pier and the height under a plurality of regions with different security levels; and determining conditions to be met by the proximity distances under the areas with different security levels according to the height and the area division rule. According to the regional division method and the regional division device, safety construction is guaranteed by dividing the safety level of the region nearby the bridge pier.

Description

Region dividing method and device
Technical Field
The application relates to the technical field of bridge construction, in particular to a region dividing method and device.
Background
In recent years, with the development of urban construction, engineering safety problems are of great importance. When the temporary pile load is carried nearby the bridge pier, the temporary pile load can affect the existing bridge and threaten the life safety of constructors nearby the bridge pier, so that the research of the temporary pile load approaching the existing bridge pier is necessary for guaranteeing the safety construction.
Disclosure of Invention
The present application aims to solve, at least to some extent, one of the technical problems in the related art.
Therefore, a first object of the present application is to provide a region dividing method to divide the security level of the region near the bridge pier, so as to realize the security construction.
A second object of the present application is to propose a region dividing device.
To achieve the above object, an embodiment of a first aspect of the present application provides a method for dividing a region, including: acquiring the pile height near the bridge pier; obtaining a pre-stored region division rule, wherein the region division rule comprises conditions to be met by the proximity distance between the stacking and the pier and the height under a plurality of regions with different security levels; and determining conditions to be met by the proximity distances under the areas with different security levels according to the height and the area division rule.
According to the regional division method provided by the embodiment of the application, the height of the pile load nearby the bridge pier is obtained, the prestored regional division rule is obtained, the regional division rule comprises conditions that the proximity distance between the pile load and the bridge pier in a plurality of regions with different security levels and the height need to be met, and the conditions that the proximity distance needs to be met in the regions with the plurality of different security levels are determined according to the height and the regional division rule. Safety construction is guaranteed by dividing safety levels of areas nearby the bridge piers.
According to an embodiment of the present application, the region dividing method further includes: constructing a pile load calculation model near the bridge pier; simulating and generating a corresponding relation among the pier offset, the height and the proximity distance according to the pier nearby stacking calculation model; and generating the region dividing rule according to the corresponding relation. According to one embodiment of the present application, the generating the region division rule according to the correspondence relationship includes: acquiring a specified upper limit value of the pier offset; and generating the region division rule according to the corresponding relation and the specified upper limit value.
According to one embodiment of the present application, the constructing a pier nearby stacking calculation model includes: simulating a pile model and a pier model in a pile calculation model near the pier by adopting an entity unit; simulating a bearing platform model in the pile load calculation model near the bridge pier by adopting a beam unit; simulating a bridge pile model in a pile load calculation model near the bridge pier by adopting a linear unit; and simulating a bridge pile-soil friction section in the pile load calculation model near the bridge pier by adopting a contact unit.
According to one embodiment of the present application, the toe of the stacking model is constructed to be a preset gradient, and the value range of the preset gradient is 30 degrees to 60 degrees.
According to one embodiment of the present application, the preset gradient is 45 degrees.
According to one embodiment of the application, the pier model is made of concrete with the strength of c 30.
According to one embodiment of the application, the stacking model is filled with the surface element.
According to one embodiment of the present application, the plurality of regions of different security levels includes a region of a first security level, a region of a second security level, and a region of a third security level, each of which has a security level that increases gradually; and the critical value of the proximity distance corresponding to the area of the first security level and the area of the second security level is 2 times of the critical value of the proximity distance corresponding to the area of the second security level and the area of the third security level.
To achieve the above object, an embodiment of a second aspect of the present application provides a region dividing apparatus, including: the first acquisition module is used for acquiring the pile height near the bridge pier; the second acquisition module is used for acquiring a pre-stored region division rule, wherein the region division rule comprises conditions that the proximity distance between the stacking and the pier and the height need to be met under a plurality of regions with different security levels; and the determining module is used for determining the conditions to be met by the proximity distances under the areas with the different security levels according to the height and the area division rule.
According to the region dividing device, the height of the pile load nearby the bridge pier is obtained, the prestored region dividing rule is obtained, the region dividing rule comprises conditions that the proximity distance between the pile load and the bridge pier and the height need to be met under the regions of different safety levels, and the conditions that the proximity distance needs to be met under the regions of different safety levels are determined according to the height and the region dividing rule. Safety construction is guaranteed by dividing safety levels of areas nearby the bridge piers.
Drawings
FIG. 1 is a flow diagram of a region partitioning method according to one embodiment of the present application;
FIG. 2 is a schematic view illustrating the definition of a temporary stacking proximity impact area in the vicinity of a bridge pier according to an embodiment of the present application;
FIG. 3 is a flow chart of a region partitioning method according to another embodiment of the present application;
fig. 4 is a schematic diagram of a temporary stacking proximity existing pier according to an embodiment of the present application;
FIG. 5 is a pile foundation construction diagram of an embodiment of the present application;
FIG. 6 is an elevation view of a calculation model of the pile load in the vicinity of the bridge pier according to the embodiment of the present application;
FIG. 7 is a side view of a calculation model of the pile load in the vicinity of a pier according to an embodiment of the present application;
FIG. 8 is an isometric view of a bridge pile-cap model according to an embodiment of the present application;
FIG. 9 is an elevation view of a bridge pile-cap model according to an embodiment of the present application;
FIG. 10 is a side view of a bridge pile-cap model according to an embodiment of the present application;
FIG. 11 is a schematic diagram of mesh division of a calculation model for pile load in the vicinity of a pier according to an embodiment of the present application;
fig. 12 is a deformed cloud image of a pile load calculation model near a pier before pile load in the embodiment of the present application;
FIG. 13 is a deformation cloud chart of a pile load calculation model near a pier when the pile load height is 4m in the embodiment of the application;
FIG. 14 is a deformation cloud image of a pile load calculation model near a pier when the pile load height is 8m in the embodiment of the present application;
FIG. 15 is a deformation cloud chart of a pile load calculation model near a pier when the pile load height is 12m in the embodiment of the application;
FIG. 16 is a deformation cloud image of a pile load calculation model near a pier when the pile load height is 16m in the embodiment of the application;
FIG. 17 is a deformation cloud chart of a pile load calculation model near a pier when the pile load height is 20m in the embodiment of the application;
FIG. 18 is a displacement vector diagram of a calculation model of pile load near a pier when the pile height is 20m in the embodiment of the present application;
fig. 19 is a graph showing the relationship between the proximity distance and the offset of the bridge pier according to the embodiment of the present application;
fig. 20 is a schematic view of changing the proximity between temporary loading and nearby piers in an embodiment of the present application;
fig. 21 is a schematic view of a calculation model of a pier neighboring pile load for changing a proximity distance between temporary pile load and neighboring piers according to an embodiment of the present application;
fig. 22 is a graph showing the relationship between the proximity distance and the height and the pier offset in accordance with the embodiment of the present application;
fig. 23 is a schematic diagram of an influence mechanism of pile load near a pier on the pier according to an embodiment of the present application;
fig. 24 is a schematic diagram of a second influence mechanism of pile load near a pier on the pier according to an embodiment of the present disclosure;
FIG. 25 is a flow chart of a region partitioning method according to another embodiment of the present application;
fig. 26 is a schematic structural view of a region dividing device according to an embodiment of the present application.
Detailed Description
Embodiments of the present application are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and intended for the purpose of explaining the present application and are not to be construed as limiting the present application.
The following describes a region dividing method and device according to an embodiment of the present application with reference to the accompanying drawings.
Fig. 1 is a flow chart of a region dividing method according to an embodiment of the present application. As shown in fig. 1, the region dividing method in the embodiment of the present application specifically may include the following steps:
s101, acquiring the pile-up height near the bridge pier.
Specifically, the pile load can be slag soil and the like which are not removed later in foundation pit engineering near the bridge pier. When the close distance between the pile and the bridge pier is fixed, the pile heights can affect the existing bridge to different degrees, so that the safety level of the area nearby the bridge pier is divided by acquiring the pile height H nearby the bridge pier. For example, the height H of the pile load near the bridge pier is H 2 =16 meters (m).
S102, acquiring a pre-stored region division rule, wherein the region division rule comprises conditions to be met by the proximity distance and the height between the region downloading and pier of a plurality of different security levels.
Specifically, a region division rule is established in advance, and the region division rule is stored. As a possible implementation manner, the plurality of regions of different security levels may specifically include a region of a first security level, a region of a second security level, and a region of a third security level, where the security level is higher, and the security of the corresponding region is lower. The area of the first security level refers to a construction area that does not significantly affect the existing structure. The area of the second security level refers to a construction area which can generate unfavorable settlement and deformation for the existing structure, the settlement and deformation of the adjacent structure should be monitored in real time in the construction process, and corresponding protection measures should be taken for the existing structure if necessary. The third safety level region is a region where construction should be avoided, and may cause large settlement, tilting or even overturning damage to the existing structures, and if the existing structures cannot be avoided, reliable protection measures should be taken for the adjacent structures.
Near distance B between pile load and pier 0 I.e. the vertical distance between the stacking and the pier. The proximity distance B corresponding to the area of the first security level and the area of the second security level 0 The critical value of (1) may be specifically the proximity distance B corresponding to the region of the second security level and the region of the third security level 0 2 times the critical value of (c). For example, as shown in FIG. 2, the proximity distance B is below the region (I) of the first security level 0 The conditions to be satisfied with the height H are as follows: b (B) 0 ＞HProximity distance B under area (II) of second security level 0 The conditions to be satisfied with the height H are as follows: h/2 < B 0 Less than or equal to H, a proximity distance B under a region (III) of a third security level 0 The conditions to be satisfied with the height H are as follows: b (B) 0 And H/2 is less than or equal to. The proximity distance B corresponding to the area of the first security level and the area of the second security level 0 Is the proximity distance B corresponding to the region of the second security level and the region of the third security level 0 2 times the critical value H/2.
S103, determining conditions to be met by the proximity distances under the areas with different security levels according to the height and the area division rules.
Specifically, according to the height H acquired in step S101 and the region division rule acquired in step S102, conditions that the proximity distances under the regions of different security levels need to be satisfied are determined. Taking the case of stacking height H of 16m as an example, the under-region approach distance B of the first security level 0 The conditions to be satisfied are: b (B) 0 Distance of approach under area of second security level B >16 m 0 The conditions to be satisfied are: m < B 0 Less than or equal to 16m, and the proximity distance B under the area with the third security level 0 The conditions to be satisfied are: b (B) 0 ≤8m。
According to the regional division method, the height of the pile load near the bridge pier is obtained, the pre-stored regional division rule is obtained, the regional division rule comprises conditions that the proximity distance between the pile load and the bridge pier under the regions of different safety levels and the height need to be met, and the conditions that the proximity distance needs to be met under the regions of the different safety levels are determined according to the height and the regional division rule. Safety construction is guaranteed by dividing safety levels of areas nearby the bridge piers.
Further, as shown in fig. 3, the "region division rule" in the above step S102 may specifically be generated by:
s301, constructing a pier nearby stacking calculation model.
Specifically, as shown in fig. 4, assuming that the bridge design load is city-a, the height of the T-shaped bridge pier is 11.8m, the bridge pier foundation adopts a pile foundation, the bearing platform below the bridge pier is a rectangular concrete block with the depth of 8×4.5×2m, the depth of burial is 2m, six bridge piles are arranged below the bearing platform, the pile foundation adopts a concrete filling pile, the pile diameter is 1m, the pile length is 9m, the stress form is a friction-end bearing pile, the pile body passes through an plain filling layer and a clay layer, and the pile bottom is embedded in a apoplexy soil layer.
The soil layers in the model range are classified into 3 layers, and the soil layers are sequentially filled with surface element, clay and apoplexy soil layers from top to bottom according to the depth arrangement, and engineering parameters of each soil layer are shown in table 1:
table 1 engineering parameters of soil layers
In order to explore the influence mechanism of the pile load on the nearby existing bridge, a pile load calculation model nearby the bridge pier needs to be constructed. The step S301 of constructing a pile load calculation model near the bridge pier may specifically include the following steps: simulating a pile model and a pier model in a pile calculation model near the pier by adopting an entity unit; simulating a bearing platform model in the pile load calculation model near the bridge pier by adopting a beam unit; simulating a bridge pile model in a pile load calculation model near the bridge pier by adopting a linear unit; and simulating a bridge pile-soil friction section in the pile load calculation model near the bridge pier by adopting a contact unit. The toe of the stacking model is constructed to be a preset gradient, and the value range of the preset gradient is 30-60 degrees. For example, the preset gradient is 45 degrees. The stacking model adopts surface element to fill soil.
Firstly, constructing a close-proximity pile-up calculation model of a pier with a fixed proximity distance, for example, a close-proximity pile-up calculation model of a pier with a proximity distance of 2m. Taking the influence of the model size on the calculation result into consideration, a 78×14.5×30m rock-soil model is established, as shown in fig. 6 and 7, fig. 6 is an elevation view of the pier nearby stacking calculation model, and fig. 7 is a side view of the pier nearby stacking calculation model. Since the study does not pay attention to stacking the right side reaction, and the model stress mainly comes from the stacking pressure, the right side can be processed according to symmetrical modeling, half of stacking is modeled, and the right side section only constrains the x direction (transverseDirection) degree of freedom, establishing a toe at a position 2m away from the existing pier asStacking model of (2), stacking height H 2 The stacking model is simulated by using a solid unit, the stacking model is scheduled to be surface element filled soil, and engineering parameters are the same as those of the rock soil layer surface element filled soil.
The pier model is simulated by adopting entity units, the bearing platform model is simulated by adopting beam units, and the bearing platform model is endowed with the size according to the pile foundation construction diagram 5. The pile is simplified into a linear type, the bridge pile model adopts linear unit simulation, conditions such as cross section shape and the like as unit attributes to endow the linear unit, the bridge pier model adopts concrete with strength of c30, and the elastic modulus E c =30gpa, density ρ c ＝25KN/m 3 An elastic constitutive model is adopted. The bridge pile-soil friction section is simulated by adopting a contact unit, and the specific modeling situation is shown in fig. 8-10. Fig. 8 is an isometric view of a bridge pile-cap model, fig. 9 is an elevation view of the bridge pile-cap model, and fig. 10 is a side view of the bridge pile-cap model.
As shown in fig. 11, the calculation model for the pile load in the vicinity of the bridge pier is mesh-divided: the grid is manually generated by adopting a mapping method, and the grid size is 2 multiplied by 1 multiplied by 2m hexahedral rock-soil units, so that the grid of the bridge pile and the bearing platform is locally encrypted for obtaining a relatively accurate result.
And constructing pier nearby stacking calculation models with different proximity distances, wherein the different proximity distances are only required to be set, and other conditions are unchanged.
S302, according to a pier nearby stacking calculation model, the corresponding relation among the pier offset, the height and the proximity distance is simulated and generated.
Specifically, the stacking process is performed in five steps, wherein the stacking height is 4m each time, and the highest stacking height is 20m.
Taking a nearby pile-up calculation model of a pier with a close distance of 2m as an example, extracting a calculated deformation graph of the nearby pile-up calculation model of the pier as shown in fig. 12-18, wherein fig. 12 is a deformation cloud graph of the nearby pile-up calculation model of the pier before pile-up, fig. 13-17 are deformation cloud graphs of the nearby pile-up calculation model of the pier with pile-up heights of 4m, 8m, 12m, 16m and 20m in sequence, and fig. 18 is a displacement vector graph of the nearby pile-up calculation model of the pier with pile-up height of 20m. For convenient observation, the deformation is increased by 3 times, and meanwhile, the process of increasing the pier offset change in the stacking process is compared, so that the following can be known:
a. the maximum deformation of the pile load calculation model near the bridge pier occurs in the pile load model and soil below the pile load model, and the maximum displacement is 70 centimeters (cm).
b. The main influence of pile loading on nearby existing piers is that the piers are offset in the direction opposite to pile loading, and the offset of the existing piers is increased continuously along with the increase of the earth volume of pile loading, and the maximum offset is 8.975cm.
The offset (offset) of the existing pier at each proximity is extracted to obtain a relationship diagram of proximity-pier offset shown in fig. 19. Analysis shows that: with the increase of the earth carrying capacity of the near pile, the offset of the existing bridge pier is continuously increased, and the pile carrying height H 2 When=20m, the maximum offset is δ max = 8.975cm, and by studying the stacking height H 2 The relation between the side displacement delta of the bridge pier and the side displacement delta of the bridge pier can be found that the side displacement delta of the bridge pier linearly increases along with the change of the stacking height.
The side displacement delta of the existing bridge pier is along with the stacking height H 2 The change relation of (2) is changed according to the following relation:
it can be considered that in the strength range, the stacking behavior has a linear influence on the stress and deformation of the bridge pier, so that the demarcation of the proximity range should be linear; the relationship between the dangerous distance and the stacking load is positive correlation, namely:
dangerous proximity distance B 0 Height H of stacking
In the existing basic standards for railway bridge and culvert design (TB 10002.1-99) (hereinafter referred to as "bridge gauge"), the following is about the horizontal displacement of the top cap surface of the abutment in the direction perpendicular to the axis of the bridge: delta is less than or equal to 5L (delta is measured in mm). The basic idea is to limit the transverse displacement of the bridge pier by a static force calculation method so as to ensure smooth line and safe train operation. This is adapted to the previous speed of 120km/h of the bus, and for the speed of the bus to 160km/h, it is reasonable to do a suitable study as to whether the above-mentioned regulations are reasonable.
The specifications of japan and europe mainly use the horizontal folding angle between the axes of adjacent structures caused by the difference in horizontal displacement of the abutment as the limit value of the horizontal displacement of the abutment, but the specifications of each country have a certain difference in the limit value of the horizontal folding angle, see table 2. In japanese specifications, the calculation of the horizontal angle of refraction only considers the live load effect of the train, and the angle of refraction limit value is as follows: when v=160 km/h, it is classified into 4%o (l.gtoreq.30m) and 3.5%o (L <30 m) by span. The eu specification explicitly states that: the load combination comprises a live load, a wind load, a transverse swinging force, a centrifugal force and temperature difference at two sides of the upper structure, wherein the live load, the wind load, the centrifugal force and the temperature difference at two sides of the upper structure are considered, the limit value of the angle is 2 per mill when 120km/h is less than or equal to 220km/h, and the limit value of the minimum curve radius R in the horizontal direction is more than or equal to 9 500 m. The allowable horizontal angle between the structural axes of german DS804 item 268 is defined as: the horizontal angle between the axes of adjacent structures must not exceed 1%o in the region of V >160 km/h. The load combination for determining the horizontal angle is as follows: live load with centrifugal force, transverse swinging force, wind load on a bridge pier, a beam body and a vehicle, temperature difference between the bridge pier and a beam body structure, rotation caused by foundation displacement and the like.
Table 2 specification of limits on horizontal folding angles
As is clear from Table 2, both the Japanese specification and the European Union specification have the limit of the horizontal displacement of the bridge pier top corresponding to a speed of about 160 km/h. The limit requirement of the Japanese standard on the transverse horizontal displacement is wider, the limit value of the horizontal folding angle between the axes of adjacent structures corresponding to the speed of 160km/h of the passenger car is 3.5 permillage to 4 permillage, and the corresponding pier top displacement value is far greater than the limit requirement of 5L of the standard in China.
Therefore, according to the most adverse factors, the rule of horizontal displacement of the top cap surface of the abutment in the direction of the axis of the vertical bridge in China (TB 10002.1-99) is selected: delta is less than or equal to 5L (delta is measured in mm). In the embodiment of the application, the length of one span is 10m, and delta is less than or equal to 5cm.
As shown in fig. 20 to 21, the proximity distance between the temporary stacking and the adjacent pier is changed, the proximity distances D0 are set to d0=0m, 4m, 8m, 12m, 16m, 20m, 24m, 28m, 32m, 36m, and other conditions are unchanged, and the influence mechanism and rule of the proximity stacking of different proximity distances on the existing pier are studied.
And extracting the offset of the existing bridge pier under each adjacent distance and each stacking height, and drawing a change relation chart of the adjacent distance, the height and the bridge pier offset as shown in fig. 22. Analysis shows that: with the increase of the proximity distance, the influence of the proximity stacking load on the existing bridge pier is continuously reduced, the maximum offset occurs at B0=0m, and the maximum lateral displacement is delta during the fourth stacking max ＝7.3cm。
S303, generating a region division rule according to the corresponding relation.
Specifically, as a possible implementation manner, the steps specifically may include: and acquiring a specified upper limit value of the pier offset, and generating a region division rule according to the corresponding relation and the specified upper limit value.
As can be seen from an analysis of the graph of the variation of the abutment distance-height-pier offset shown in fig. 22, the influence pier offset and the pile height show a linear relationship when the distance is short. As is clear from the upper limit value Δ=5cm, when the stacking height is 16m, the dangerous distance is 8m, and when the double dangerous distance is safety redundancy, the safe distance can be 16m; when the stacking height is 12m, the more dangerous distance is between 8 and 4m, 6m can be linearly interpolated as the dangerous distance due to the linear characteristic of the safe distance, and when one time of the dangerous distance is used as the safety redundancy, the safe distance can be set to be 12m.
Thus, when approaching distance B 0 When the displacement is larger than delta in the range of H/2, the displacement is in a dangerous state; then gradually tending to safety along with the reduction of the approaching distance, taking the 2 times of the dangerous distance as the safety distance, and taking the safety approaching distance as B 0 And (3) H, and generating the region division rule in the embodiment according to the H.
As can be appreciated by those skilled in the art, as shown in fig. 23 to 24, the mechanism of influence of the pile load near the pier of 1.1.3 in the embodiment of the present application on the pier is as follows: the upper part of the bridge pile is fixedly connected with the bearing platform, the pile end is fixedly embedded in the foundation rock and can be regarded as a hinged support, and under the working condition of piling soil, the basic deformation mode of the bridge pile is that the bridge pile is deviated from the upper bearing platform and the pier structure to the side opposite to the soil pile. The fixed pile load influence can be regarded as a shear plate damage process on a soil body in a semi-free infinite range, according to a foundation damage mode proposed by Prandl, a plastic region only develops into a certain range of a foundation under the initial load of pile load, a sliding surface in the soil does not extend to the ground, the ground on two sides of the foundation slightly bulges, and no obvious crack appears. At this time, the soil body at two sides moves to cause the lateral movement of the bridge, however, the bottom of the bridge foundation is equivalent to a hinged support with initial displacement due to the embedding effect of the pile ends of the bridge, and the displacement of the bottom of the pile is limited, so that the bending reduction deformation and the establishment of the force pile body and the increase of the force in bending moment are caused.
In order to clearly describe the region dividing method according to the embodiment of the present application, the following description will be made in detail with reference to fig. 25. Fig. 25 is a flow chart of a region dividing method according to another embodiment of the present application. As shown in fig. 25, the region dividing method in the embodiment of the present application specifically includes the following steps:
s251, acquiring the pile height near the bridge pier.
S252, simulating a pile model and a pier model in the pile calculation model near the pier by adopting the entity units.
S253, simulating a bearing platform model in the pier nearby stacking calculation model by adopting a beam unit.
S254, simulating a bridge pile model in the pile load calculation model near the bridge pier by adopting a linear unit.
And S255, simulating a bridge pile-soil friction section in the pile load calculation model near the bridge pier by adopting the contact unit.
And S256, simulating and generating the corresponding relation among the offset, the height and the proximity distance of the bridge pier according to the pile load calculation model nearby the bridge pier.
S257, a specified upper limit value of the pier offset is obtained.
S258, generating a region division rule according to the corresponding relation and the prescribed upper limit value.
According to the regional division method, the height of the pile load near the bridge pier is obtained, the pre-stored regional division rule is obtained, the regional division rule comprises conditions that the proximity distance between the pile load and the bridge pier under the regions of different safety levels and the height need to be met, and the conditions that the proximity distance needs to be met under the regions of the different safety levels are determined according to the height and the regional division rule. Safety construction is guaranteed by dividing safety levels of areas nearby the bridge piers.
In order to achieve the above embodiments, the embodiments of the present application further provide a region dividing device, which can implement the region dividing method of any one of the above embodiments. As shown in fig. 26, the area dividing apparatus provided in the embodiment of the present application may specifically include: a first acquisition module 261, a second acquisition module 262, and a determination module 263. Wherein:
the first obtaining module 261 is configured to obtain a height of a pile load near the bridge pier.
The second obtaining module 262 is configured to obtain a pre-stored region division rule, where the region division rule includes conditions that a proximity distance and a height between the region downloading and pier of a plurality of different security levels need to be satisfied.
The determining module 263 is configured to determine conditions to be satisfied by the proximity distances under the areas of the plurality of different security levels according to the altitude and the area division rule.
Further, in one possible implementation manner of the embodiment of the present application, the second obtaining module 262 is further configured to: constructing a pile load calculation model near the bridge pier; simulating and generating the corresponding relation among the offset, the height and the proximity distance of the bridge pier according to the pile-up calculation model near the bridge pier; and generating a region dividing rule according to the corresponding relation.
Further, in one possible implementation manner of the embodiment of the present application, the second obtaining module 262 is specifically configured to: acquiring a specified upper limit value of the pier offset; and generating a region division rule according to the corresponding relation and the specified upper limit value.
Further, in one possible implementation manner of the embodiment of the present application, the second obtaining module 262 is specifically configured to: simulating a stacking model and a pier model in a stacking calculation model near the pier by adopting an entity unit; simulating a bearing platform model in the pile load calculation model near the bridge pier by adopting a beam unit; simulating a bridge pile model in the pile load calculation model near the bridge pier by adopting a linear unit; and simulating the pile-soil friction section in the pile load calculation model near the bridge pier by adopting the contact unit.
Further, in a possible implementation manner of the embodiment of the present application, a toe of the stacking model is constructed to be a preset gradient, and a value range of the preset gradient is 30 degrees to 60 degrees.
Further, in one possible implementation manner of the embodiment of the present application, the preset gradient is 45 degrees.
Further, in one possible implementation manner of the embodiment of the present application, the pier model uses concrete with a strength of c 30.
Further, in one possible implementation manner of the embodiment of the present application, the plurality of regions with different security levels includes a region with a first security level, a region with a second security level, and a region with a third security level, where the security levels are gradually increased; the threshold value of the proximity distance corresponding to the region of the first security level and the region of the second security level is 2 times the threshold value of the proximity distance corresponding to the region of the second security level and the region of the third security level.
It should be noted that the foregoing explanation of the embodiment of the method for dividing a region is also applicable to the device for dividing a region of this embodiment, and will not be repeated here.
According to the region dividing device, the height of the pile load nearby the bridge pier is obtained, the pre-stored region dividing rule is obtained, the region dividing rule comprises conditions that the proximity distance between the pile load and the bridge pier and the height need to be met under the regions of a plurality of different safety levels, and the conditions that the proximity distance needs to be met under the regions of the plurality of different safety levels are determined according to the height and the region dividing rule. Safety construction is guaranteed by dividing safety levels of areas nearby the bridge piers.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Although embodiments of the present application have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the application, and that variations, modifications, alternatives, and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the application.

Claims (7)

1. A method of region division, comprising:
acquiring the pile height near the bridge pier;
obtaining a pre-stored region division rule, wherein the region division rule comprises conditions to be met by the proximity distance between the stacking and the pier and the height under a plurality of regions with different security levels;
determining conditions to be met by the proximity distances in the areas with different security levels according to the height and the area dividing rule;
wherein, still include: constructing a pile load calculation model near the bridge pier; simulating and generating a corresponding relation among the pier offset, the height and the proximity distance according to the pier nearby stacking calculation model; generating the region division rule according to the corresponding relation;
wherein the generating the region division rule according to the correspondence relationship includes: acquiring a specified upper limit value of the pier offset; generating the region division rule according to the corresponding relation and the specified upper limit value;
the construction of the pier nearby stacking calculation model comprises the following steps: simulating a pile model and a pier model in a pile calculation model near the pier by adopting an entity unit; simulating a bearing platform model in the pile load calculation model near the bridge pier by adopting a beam unit; simulating a bridge pile model in a pile load calculation model near the bridge pier by adopting a linear unit; and simulating a bridge pile-soil friction section in the pile load calculation model near the bridge pier by adopting a contact unit.
2. The method of claim 1, wherein the toe of the stacking model is constructed to have a preset gradient, and the preset gradient has a value ranging from 30 degrees to 60 degrees.
3. The method of generating according to claim 2, wherein the preset gradient is 45 degrees.
4. The method of claim 1, wherein the bridge pier model is made of concrete with a strength of c 30.
5. The method of claim 1, wherein the stacking model is filled with a topsin.
6. The generation method according to claim 1, wherein the plurality of areas of different security levels includes an area of a first security level, an area of a second security level, and an area of a third security level, each of which security levels gradually increase;
and the critical value of the proximity distance corresponding to the area of the first security level and the area of the second security level is 2 times of the critical value of the proximity distance corresponding to the area of the second security level and the area of the third security level.
7. An area dividing apparatus, comprising:
the first acquisition module is used for acquiring the pile height near the bridge pier;
the second acquisition module is used for acquiring a pre-stored region division rule, wherein the region division rule comprises conditions that the proximity distance between the stacking and the pier and the height need to be met under a plurality of regions with different security levels;
the determining module is used for determining conditions to be met by the proximity distances under the areas with the different security levels according to the height and the area division rule;
wherein the second acquisition module is further configured to: constructing a pile load calculation model near the bridge pier; simulating and generating a corresponding relation among the pier offset, the height and the proximity distance according to the pier nearby stacking calculation model; generating the region division rule according to the corresponding relation;
wherein the second acquisition module is further configured to: acquiring a specified upper limit value of the pier offset; generating the region division rule according to the corresponding relation and the specified upper limit value;
wherein the second acquisition module is further configured to: simulating a pile model and a pier model in a pile calculation model near the pier by adopting an entity unit; simulating a bearing platform model in the pile load calculation model near the bridge pier by adopting a beam unit; simulating a bridge pile model in a pile load calculation model near the bridge pier by adopting a linear unit; and simulating a bridge pile-soil friction section in the pile load calculation model near the bridge pier by adopting a contact unit.
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