CN110210175A - A kind of composite foundation embankment side slope finite element calculating method for stability - Google Patents
A kind of composite foundation embankment side slope finite element calculating method for stability Download PDFInfo
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- CN110210175A CN110210175A CN201910546191.4A CN201910546191A CN110210175A CN 110210175 A CN110210175 A CN 110210175A CN 201910546191 A CN201910546191 A CN 201910546191A CN 110210175 A CN110210175 A CN 110210175A
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- composite foundation
- pile body
- finite element
- soil
- side slope
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- 239000002131 composite material Substances 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000002689 soil Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000011435 rock Substances 0.000 claims abstract description 5
- 238000009533 lab test Methods 0.000 claims abstract description 4
- 238000012360 testing method Methods 0.000 claims abstract description 4
- 230000003014 reinforcing effect Effects 0.000 claims description 2
- 238000006073 displacement reaction Methods 0.000 claims 1
- 238000004364 calculation method Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 241000212384 Bifora Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 229910000514 dolomite Inorganic materials 0.000 description 1
- 239000010459 dolomite Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
Classifications
-
- 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
- E02D17/20—Securing of slopes or inclines
-
- 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]
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/06—Power analysis or power optimisation
Abstract
The invention discloses a kind of composite foundation embankment side slope finite element calculating method for stability, comprising the following steps: the physical mechanics parameter of rock and soil of all material step 1: is determined by field test or laboratory test；Step 2: arrangement form, the arrangement spacing, pile body diameter of pile body are determined；Step 3: composite foundation cohesive force Cc, composite foundation internalfrictionangleφ c, composite foundation elastic modulus E c and the composite foundation bulk density γ c in pile body arrangement range are calculated according to following equation.Step 4: establishing the embankment side slope finite element model for having composite foundation, and wherein the Soil Parameters in composite foundation region calculate safety factor of slope stability FOS using Strength Reduction Method using the calculated result in step 3.The advantages of the present invention over the prior art are that: this method computational accuracy error compared with the finite element model for establishing complete pile body is no more than 3%；2, this method calculating time only needs to establish complete pile body finite element mould calculates the time 1/10 ~ 1/8.
Description
Technical field
The present invention relates to a kind of calculating of slope stability more particularly to a kind of composite foundation embankment side slope finite element stability
Calculation method.
Background technique
For the calculating of composite foundation embankment slope stability, usually there are two types of calculation methods, and one is the poles used in engineering
Balancing method is limited, another method is to establish complete pile body model using finite element to be analyzed.Limit equilibrium method calculates compound
It is bigger than normal to will appear Bishop approach result when ground embankment slope stability, and Sweden Arc Method calculated result is less than normal；It establishes
Although the finite element model computational solution precision of complete pile body is very high, since pile body is generally circular, this will lead to pile body with
And the Local grid density of surrounding soil is excessive, needs the longer calculating time.It is high while counting how a kind of computational accuracy is provided
Evaluation time and fast composite foundation embankment analytical methods for slope stability are problems to be solved during slope stability calculates.
Summary of the invention
The purpose of the present invention is to provide a kind of composite foundation embankment side slope finite element calculating method for stability, existing to solve
There is limit equilibrium method computational solution precision low, and complete pile body finite element model calculates time-consuming problem.
To achieve the above object, the invention provides the following technical scheme: a kind of composite foundation embankment side slope finite element is stablized
Property calculation method, comprising the following steps:
Step 1: the physical mechanics parameter of rock and soil of all material, the ground are determined by field test or laboratory test
Physical and mechanical parameter includes bulk density γ, cohesive force C, internal friction angleAnd elastic modulus E, all material refer to embankment side slope soil
The pile body in the soil body, stratum in body, stratum；
Step 2: arrangement form (square or triangular arrangement), the arrangement spacing, pile body diameter of pile body, pile body are determined
Arrangement range no more than 10m；
Step 3: the composite foundation cohesive force C in pile body arrangement range is calculated according to following equationc, rub in composite foundation
Wipe angleComposite foundation elastic modulus EcWith composite foundation bulk density γc。
Cc=Cs(1-m)+mCp
Ec=Es(1-m)+mEp
γc=γs(1-m)+mγp
M=Ap/Ae
In formula, Cs、CpThe respectively cohesive force of the soil body and pile body；The respectively interior friction of the soil body and pile body
Angle；Es、EpThe respectively elasticity modulus of the soil body and pile body；γs、γpThe respectively bulk density of the soil body and pile body；M is composite foundation face
Product replacement rate；Ap、AeThe respectively reinforcing area that is undertaken of the cross-sectional area of pile body and the pile body.
Step 4: establishing the embankment side slope finite element model for having composite foundation, wherein the soil body ginseng in composite foundation region
Number calculates safety factor of slope stability FOS using the calculated result in step 3, using Strength Reduction Method.
The advantages of the present invention over the prior art are that:
1. this method computational accuracy error compared with the finite element model for establishing complete pile body is no more than 3%；
2. this method calculates the time and only needs to establish complete pile body finite element mould calculates the time 1/10~1/8.
Detailed description of the invention
Fig. 1 is embankment side slope sectional view；
Fig. 2 is composite foundation embankment side slope finite element model figure；
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Embodiment is referring to Fig.1 shown in -2, a kind of composite foundation embankment side slope finite element calculating method for stability, including following
Step:
Step 1: certain embankment side slope, stratum are followed successively by hard plastic admaic earth, plastic admaic earth, soft modeling admaic earth from top to bottom
With middle Baiyun rock mantle, side slope sectional view is as shown in Figure 1, determine the ground object of all material by field test and laboratory test
Reason mechanics parameter is as follows:
Step 2: using the pile body arrangement form of square, arrangement spacing is 2m, and pile body diameter is 1.5m, arranges range
Extend internally 10m from side slope slope foot, and pile body depth reaches middle weathering dolomite stratigraph face.
Step 3: it is as shown in the table that composite foundation parameter is calculated according to formula.
Step 4: the embankment side slope finite element model with composite foundation is established as shown in Fig. 2, using Strength Reduction Method meter
Calculate safety factor of stability FOS=1.513.
The present invention is used cooperatively based on compound soil body intensive parameter, by it with finite element model, analysis the result shows that
When the range of composite foundation is no more than 10m, this method computational accuracy error compared with the finite element model for establishing complete pile body
No more than 3%, and the calculating time is only the 1/10~1/8 of the latter, greatly improves computational efficiency.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (3)
1. a kind of composite foundation embankment side slope finite element calculating method for stability, it is characterised in that: the following steps are included:
Step 1: the physical mechanics parameter of rock and soil of all material is determined by field test or laboratory test；
Step 2: arrangement form, the arrangement spacing, pile body diameter of pile body are determined；
Step 3: the composite foundation cohesive force C in pile body arrangement range is calculated according to following equationc, composite foundation internal friction angleComposite foundation elastic modulus EcWith composite foundation bulk density γc。
Cc=Cs(1-m)+mCp
Ec=Es(1-m)+mEp
γc=γs(1-m)+mγp
M=Ap/Ae
In formula, Cs、CpThe respectively cohesive force of the soil body and pile body；The respectively internal friction angle of the soil body and pile body；Es、
EpThe respectively elasticity modulus of the soil body and pile body；γs、γpThe respectively bulk density of the soil body and pile body；M is the displacement of composite foundation area
Rate；Ap、AeThe respectively reinforcing area that is undertaken of the cross-sectional area of pile body and the pile body；
Step 4: the embankment side slope finite element model for having composite foundation is established, wherein the Soil Parameters in composite foundation region are adopted
With the calculated result in step 3, safety factor of slope stability FOS is calculated using Strength Reduction Method.
2. a kind of composite foundation embankment side slope finite element calculating method for stability according to claim 1, it is characterised in that:
The physical mechanics parameter of rock and soil includes bulk density γ, cohesive force C, internal friction angleAnd elastic modulus E, all material refer to embankment
The pile body in the soil body, stratum in slope soil, stratum.
3. a kind of composite foundation embankment side slope finite element calculating method for stability according to claim 1, it is characterised in that:
The arrangement form of the pile body is square or triangular arrangement, and the arrangement range of pile body is no more than 10m.
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| CN201910546191.4A CN110210175A (en) | 2019-06-21 | 2019-06-21 | A kind of composite foundation embankment side slope finite element calculating method for stability |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110569609A (en) * | 2019-09-12 | 2019-12-13 | 青岛理工大学 | Method for determining critical value of particle displacement after slope instability |
| CN111241621A (en) * | 2020-01-13 | 2020-06-05 | 西南交通大学 | Stability evaluation method for high-strength pile composite foundation under embankment |
| CN111241702A (en) * | 2020-01-17 | 2020-06-05 | 中铁二院工程集团有限责任公司 | Stability calculation method for slope soft soil foundation filling project |
| CN111353254A (en) * | 2020-04-02 | 2020-06-30 | 贵州正业工程技术投资有限公司 | Side slope supporting structure design method based on finite element strength reduction method |
| CN111400894A (en) * | 2020-03-12 | 2020-07-10 | 中铁二院工程集团有限责任公司 | Concrete pile composite foundation stability calculation method |
| CN112257140A (en) * | 2020-09-16 | 2021-01-22 | 南京工业大学 | Safety coefficient calculation method for stability of seabed slope |
| CN112597569A (en) * | 2020-12-17 | 2021-04-02 | 贵州正业工程技术投资有限公司 | Composite foundation filling slope stability evaluation method based on simplified Bishou method |
| CN112733368A (en) * | 2021-01-13 | 2021-04-30 | 贵州正业工程技术投资有限公司 | Method for calculating characteristic value of bearing capacity at bottom surface of bonding pile composite foundation |
| CN113204910A (en) * | 2021-06-08 | 2021-08-03 | 吉林大学 | Modeling method of root soil complex finite element model based on ABAQUS |
| CN113221207A (en) * | 2021-04-02 | 2021-08-06 | 中铁第四勘察设计院集团有限公司 | Method and device for determining stability of rigid pile composite foundation |
| CN115288162B (en) * | 2022-07-25 | 2023-09-22 | 中冶集团武汉勘察研究院有限公司 | Reinforcing method for soft soil foundation filling side slope |
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Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110569609A (en) * | 2019-09-12 | 2019-12-13 | 青岛理工大学 | Method for determining critical value of particle displacement after slope instability |
| CN111241621A (en) * | 2020-01-13 | 2020-06-05 | 西南交通大学 | Stability evaluation method for high-strength pile composite foundation under embankment |
| CN111241702A (en) * | 2020-01-17 | 2020-06-05 | 中铁二院工程集团有限责任公司 | Stability calculation method for slope soft soil foundation filling project |
| CN111241702B (en) * | 2020-01-17 | 2022-07-08 | 中铁二院工程集团有限责任公司 | Stability calculation method for slope soft soil foundation filling project |
| CN111400894B (en) * | 2020-03-12 | 2022-05-31 | 中铁二院工程集团有限责任公司 | Concrete pile composite foundation stability calculation method |
| CN111400894A (en) * | 2020-03-12 | 2020-07-10 | 中铁二院工程集团有限责任公司 | Concrete pile composite foundation stability calculation method |
| CN111353254A (en) * | 2020-04-02 | 2020-06-30 | 贵州正业工程技术投资有限公司 | Side slope supporting structure design method based on finite element strength reduction method |
| CN112257140A (en) * | 2020-09-16 | 2021-01-22 | 南京工业大学 | Safety coefficient calculation method for stability of seabed slope |
| CN112597569A (en) * | 2020-12-17 | 2021-04-02 | 贵州正业工程技术投资有限公司 | Composite foundation filling slope stability evaluation method based on simplified Bishou method |
| CN112597569B (en) * | 2020-12-17 | 2023-05-16 | 贵州正业工程技术投资有限公司 | Composite foundation filling slope stability evaluation method based on simplified PicoPu method |
| CN112733368A (en) * | 2021-01-13 | 2021-04-30 | 贵州正业工程技术投资有限公司 | Method for calculating characteristic value of bearing capacity at bottom surface of bonding pile composite foundation |
| CN113221207A (en) * | 2021-04-02 | 2021-08-06 | 中铁第四勘察设计院集团有限公司 | Method and device for determining stability of rigid pile composite foundation |
| CN113221207B (en) * | 2021-04-02 | 2022-05-13 | 中铁第四勘察设计院集团有限公司 | Method and device for determining stability of rigid pile composite foundation |
| CN113204910A (en) * | 2021-06-08 | 2021-08-03 | 吉林大学 | Modeling method of root soil complex finite element model based on ABAQUS |
| CN113204910B (en) * | 2021-06-08 | 2022-04-15 | 吉林大学 | Modeling method of root soil complex finite element model based on ABAQUS |
| CN115288162B (en) * | 2022-07-25 | 2023-09-22 | 中冶集团武汉勘察研究院有限公司 | Reinforcing method for soft soil foundation filling side slope |
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Application publication date: 20190906 |