CN109113105A - A kind of foundation pit calculation method based on Progressive Collapse design - Google Patents
A kind of foundation pit calculation method based on Progressive Collapse design Download PDFInfo
- Publication number
- CN109113105A CN109113105A CN201710518973.8A CN201710518973A CN109113105A CN 109113105 A CN109113105 A CN 109113105A CN 201710518973 A CN201710518973 A CN 201710518973A CN 109113105 A CN109113105 A CN 109113105A
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- China
- Prior art keywords
- foundation pit
- simulation
- axle power
- model
- soil body
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000013461 design Methods 0.000 title claims abstract description 17
- 230000000750 progressive effect Effects 0.000 title claims abstract description 16
- 238000004364 calculation method Methods 0.000 title claims abstract description 14
- 238000000034 method Methods 0.000 claims abstract description 26
- 239000002689 soil Substances 0.000 claims abstract description 20
- 238000009412 basement excavation Methods 0.000 claims abstract description 16
- 238000004088 simulation Methods 0.000 claims abstract description 15
- 238000012360 testing method Methods 0.000 claims description 7
- 239000011150 reinforced concrete Substances 0.000 claims description 6
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 abstract description 4
- 238000005452 bending Methods 0.000 description 2
- 235000001674 Agaricus brunnescens Nutrition 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Management, Administration, Business Operations System, And Electronic Commerce (AREA)
Abstract
The invention discloses a kind of foundation pit calculation methods based on Progressive Collapse design, comprising the following steps: step 1: establishing and excavates finite element model；Step 2: simulation soil excavation process；Step 3: " element death and birth " simulation foundation pit support part being utilized to fail；Step 4: obtaining load (axle power) carry-over factor.The soil body of the present invention uses M-C model, building enclosure uses linear elastic model, finite element model is established using FEM software, and sunykatuib analysis is carried out to foundation pit construction process, detailed simulation has been carried out to the details such as crustal stress balance, the construction of building enclosure, earth excavation in Excavation Process, and then obtain foundation pit load (axle power) carry-over factor, with innovative significance, possess extensive future in engineering applications.
Description
Technical field
The present invention relates to Design of Excavation Project field, in particular to field of preventing and reducing natural disasters.
Background technique
In recent years, with the development of economy, the level of urbanization in China is continuously improved, especially after the 1980s,
All kinds of skyscrapers in China occur like the mushrooms after rain, and all kinds of buildings gradually increase with municipal works, market place builet below the ground, underground rail
Traffic etc. continues to bring out, and base pit engineering develops towards super large, ultra-deep direction.
Compared to Structural Engineering, base pit engineering has very strong regional and uncertainty, with location or local field
The engineering geology on ground and the difference of hydrogeologic condition, otherness are very big.A possibility that continuous malicious event therefore, occurs,
Loss caused by accident, caused social influence popularity even can be more than the continuous destruction of superstructure work.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of reinforced concrete supports based on Progressive Collapse design
Calculation of axial force method, by using M-C model, building enclosure uses linear elastic model, utilizes FEM software ABAQUS
It establishes finite element model and sunykatuib analysis is carried out to foundation pit construction process, to crustal stress balance, building enclosure in Excavation Process
The details such as construction, earth excavation carried out detailed simulation, obtain foundation pit load (axle power) carry-over factor, possess extensive work
Journey application prospect.
In order to solve the above technical problems, the present invention provides a kind of reinforced concrete support axis based on Progressive Collapse design
The calculation method of power, which comprises the following steps:
Step 1: establishing excavation finite element model in the engineering investigation stage and pass through direct shear test or triaxial test
The experiment parameter of weak soil body is obtained, the soil body uses M-C model, according to the parameter of excavation scheme and the soil body, introduces nothing
The influence of unit simulation semi-infinite region is limited, establishes and excavates finite element model
Step 2 simulates soil excavation process, is balanced to the crustal stress of model, using " element death and birth " control methods to soil
Body digging process is simulated.
Step 3 simulates support part failure, removes certain road using dismounting component method and " element death and birth " control methods and supports
Simulate partial failure.
Step 4 obtains load (axle power) carry-over factor, analyzes remaining foundation pit and is displaced mechanical behavior, show that load (axle power) passes
Pass coefficient.
In step 1 establish it is described excavate finite element model specific method the following steps are included:
Step 1.1: the soil body uses M-C model, and wherein c, φ are determined by indoor triaxial test.
Step 1.2: establishing Infinite Element three-dimensional excavation models, and balance crustal stress.
Finite element model of the present invention includes the CPE4 unit simulation soil body, CPE4R unit simulation enclosure wall.
Detailed description of the invention
Fig. 1 is the flow diagram of the foundation pit calculation method of the invention based on Progressive Collapse design.
Fig. 2 is the model schematic of the foundation pit calculation method of the invention based on Progressive Collapse design.
Fig. 3 is the support number figure of the foundation pit calculation method of the invention based on Progressive Collapse design.
Fig. 4 is gone along with sb. to guard him under the support of each layer 1 of the foundation pit calculation method of the invention based on Progressive Collapse design is failed
Structure maximum horizontal displacement curve graph.
Fig. 5 is gone along with sb. to guard him under the support of each layer 1 of the foundation pit calculation method of the invention based on Progressive Collapse design is failed
Structure curve of maximum bending moments figure.
Fig. 6 is gone along with sb. to guard him under the support of each layer 2 of the foundation pit calculation method of the invention based on Progressive Collapse design is failed
Structure maximum horizontal displacement curve graph.
Fig. 7 is gone along with sb. to guard him under the support of each layer 2 of the foundation pit calculation method of the invention based on Progressive Collapse design is failed
Structure curve of maximum bending moments figure.
Specific embodiment
The technical scheme in the embodiments of the invention will be clearly and completely described below, it is clear that described implementation
Example is only a part of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
Technical staff's all other embodiment obtained without making creative work belongs to the model that the present invention protects
It encloses.
A kind of calculation method of the reinforced concrete support axle power based on Progressive Collapse design, which is characterized in that including
Following steps:
Step 1: establishing excavation finite element model in the engineering investigation stage and pass through direct shear test or triaxial test
The experiment parameter of weak soil body is obtained, the soil body uses M-C model, according to the parameter of excavation scheme and the soil body, introduces nothing
The influence of unit simulation semi-infinite region is limited, establishes and excavates finite element model；
Step 2: simulation soil excavation process is balanced the crustal stress of model, using " element death and birth " control methods pair
Soil excavation process is simulated；
Step 3: simulation support part failure removes certain road using dismounting component method and " element death and birth " control methods and supports
Simulate partial failure；
Step 4: obtaining load (axle power) carry-over factor, analyze remaining foundation pit and be displaced mechanical behavior, obtain load (axle power)
Carry-over factor.
Preferably, the load in the step 4 (axle power carry-over factor) i.e. adjacent supports axle power increases multiple, horizontal direction
For the horizontal carry-over factor K of load (axle power)h(horizontal), vertical direction is load (axle power) vertical carry-over factor Kv
(vertical)。
Claims (3)
1. it is a kind of based on Progressive Collapse design reinforced concrete support axle power calculation method, which is characterized in that including with
Lower step
Step 1: establishing and excavate finite element model, in the engineering investigation stage, obtained by direct shear test or triaxial test
The experiment parameter of weak soil body, the soil body use M-C model, according to the parameter of excavation scheme and the soil body, introduce unlimited single
The influence of member simulation semi-infinite region, establishes and excavates finite element model
Step 2: simulation soil excavation process is balanced the crustal stress of model, using " element death and birth " control methods to the soil body
Digging process is simulated.
Step 3: simulation support part failure removes the support simulation of certain road using dismounting component method and " element death and birth " control methods
Partial failure.
Step 4: obtaining load (axle power) carry-over factor, analyze remaining foundation pit and be displaced mechanical behavior, show that load (axle power) is transmitted
Coefficient.
2. a kind of calculating side of reinforced concrete support axle power based on Progressive Collapse design according to claim 1
Method, which is characterized in that the finite element model soil body in step 1 uses CPE4 unit simulation, and enclosure wall uses CPE4R unit mould
It is quasi-.
3. a kind of calculating side of reinforced concrete support axle power based on Progressive Collapse design according to claim 1
Method, which is characterized in that dismounting component method is instantaneously to remove the support of certain position described in step 3, analyzes the displacement of remaining foundation pit
Mechanical response.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710518973.8A CN109113105A (en) | 2017-06-26 | 2017-06-26 | A kind of foundation pit calculation method based on Progressive Collapse design |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710518973.8A CN109113105A (en) | 2017-06-26 | 2017-06-26 | A kind of foundation pit calculation method based on Progressive Collapse design |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109113105A true CN109113105A (en) | 2019-01-01 |
Family
ID=64821918
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710518973.8A Pending CN109113105A (en) | 2017-06-26 | 2017-06-26 | A kind of foundation pit calculation method based on Progressive Collapse design |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109113105A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110674545A (en) * | 2019-09-03 | 2020-01-10 | 四川农业大学 | Complex boundary foundation pit model construction method |
-
2017
- 2017-06-26 CN CN201710518973.8A patent/CN109113105A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110674545A (en) * | 2019-09-03 | 2020-01-10 | 四川农业大学 | Complex boundary foundation pit model construction method |
| CN110674545B (en) * | 2019-09-03 | 2022-11-18 | 四川农业大学 | Complex boundary foundation pit model construction method |
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Addressee: Gu Jiacheng Document name: Notification of before Expiration of Request of Examination as to Substance |
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| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20190101 |
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| WD01 | Invention patent application deemed withdrawn after publication |