CN108222084A - A kind of Analysis of Bearing Capacity method of pile body under engineering pile test pile operating mode - Google Patents
A kind of Analysis of Bearing Capacity method of pile body under engineering pile test pile operating mode Download PDFInfo
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- CN108222084A CN108222084A CN201810029189.5A CN201810029189A CN108222084A CN 108222084 A CN108222084 A CN 108222084A CN 201810029189 A CN201810029189 A CN 201810029189A CN 108222084 A CN108222084 A CN 108222084A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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Abstract
A kind of Analysis of Bearing Capacity method of pile body under engineering pile test pile operating mode, it is related to technical field of buildings.It is realized by following steps：First, first, engineering pile vertical bearing capacity of single pile characteristic value R is determineda；2nd, then, it is determined that test pile ultimate vertical bearing capacity standard value Quk；3rd, further, checking computations test pile pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value Ru；4th, it is last, analysis verification pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value RuWith vertical ultimate bearing capacity of single pile standard value Quk；After adopting the above technical scheme, the present invention has the beneficial effect that：It can readily determine that test pile pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value Ru, the strength grade of concrete and vertical muscle of checking computations and allocation project stake test pile pile body, accomplish safe, applicable, economic, the optimization of the designing quality of guarantee engineering pile test pile pile body accordingly.
Description
Technical field
The present invention relates to technical field of buildings, and in particular to the Analysis of Bearing Capacity side of pile body under a kind of engineering pile test pile operating mode
Method.
Background technology
Engineering pile uses in engineering, finally in the stake built, stress works in structures.Engineering pile is to use
Stake on engineering entity will bear certain load, and bearing capacity is by foundation soil to the bearing value of stake and pile body knot
Structure intensity controls simultaneously；Test pile does detection design and uses, and individually to do test pile.For foundation soil to the bearing value of stake,《It builds
Build standard for pile foundation》, it is specified that single-pile vertical orientation carries in the 5.2.2 articles of (JGJ 94-2008) (hereinafter referred to as " Pile Foundation Code ")
Power characteristic value RaIt should determine as the following formula：Ra=1/kQuk(a), Q in formulaukFor vertical ultimate bearing capacity of single pile standard value；K is
Safety coefficient takes K=2.
For pile structural strength bearing capacity, in the case where load effect combines substantially, the 5.8.2 articles of Pile Foundation Code is for steel
The calculation formula that reinforced concrete axial compression stake compressive load-carrying capacity of normal cross section provides is：(1) below stake top 5d ranges pile body
Spiral stirrup spacing meets the timing of Pile Foundation Code 4.1.1 rules and regulations no more than 100mm：N≤RP=ψCfCAps+0.9f′yA′s(b)；(2) when pile body arrangement of reinforcement does not meet above-mentioned regulation：N≤RP=ψCfCAps(c)；N is load effect base in formula
Stake top axial compressive force design value under this combination；RPFor pile body compression bearing design value；ψCFor foundation pile pile-formation process coefficient, press
The 5.8.3 articles regulation value of Pile Foundation Code； fCFor concrete axial compressive strength design value；f′yFor lengthways main steel bar compression strength
Design value；A′sFor lengthways main steel bar area of section.
Above-mentioned pile structural strength check formula is that the pile structural strength control under being combined substantially for load effect carries
Go out, pile body bears ultimate vertical bearing capacity standard value during engineering pile test pile, and the force-bearing situation of the two is inconsistent, therefore tries
The pile structural strength control of stake can not indiscriminately imitate above-mentioned calculation formula.Ultimate vertical bearing capacity standard value is born for test pile pile body
When pile structural strength checking computations, Pile Foundation Code do not provide related check formula.Pile Foundation Code is only in 5.8.2,5.8.3 article
In explanation, as long as proposing that bearing capacity of pile meets formula (b) and (c), corresponding pile body compression bearing design value and single-pile vertical orientation
(R when the ratio between characteristic load bearing capacity k ' takes 1.35P=1.35Ra, RP- pile body compression bearing design value, Ra- single-pile vertical orientation is held
Carry power characteristic value, k '=RP/Ra=1.35) pile body when, originally can meet test pile simultaneously for bored concrete pile pile body rheobase is vertical
Ultimate bearing capacity requirement.
Argument during pile foundation provision illustrates lacks strict Theoretical Proof, is not also discussed simultaneously for other types engineering pile
It states.To current, pile structural strength check analysis method when bearing ultimate vertical bearing capacity standard value for test pile pile body is still
So lack.Therefore, establishing bearing capacity of pile analysis method when test pile pile body bears ultimate vertical bearing capacity standard value has weight
Want meaning.
Invention content
In view of the defects and deficiencies of the prior art, the present invention intends to provide pile bodies under a kind of engineering pile test pile operating mode
Analysis of Bearing Capacity method, it can readily determine that test pile pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value Ru, check and match accordingly
The strength grade of concrete of engineering pile test pile pile body and vertical muscle are put, accomplishes safe, applicable, economic, guarantee engineering pile test pile pile body
Designing quality optimization.
To achieve the above object, the technical scheme is that：The bearing capacity of pile body point under a kind of engineering pile test pile operating mode
Analysis method is realized by following steps：First, first, engineering pile vertical bearing capacity of single pile characteristic value R is determineda, (1) is according to foundation soil pair
The bearing value of stake, according to Pile Foundation Code correlation computations formula, the vertical bearing capacity of single pile characteristic value R being calculateda1；(2) exist
Under load effect standard combination, according to the 5.2.1 articles of Pile Foundation Code：
Load effect standard combination：
Under the vertical force effect of axle center
NK≤Ra2
Under eccentric vertical force effect, in addition to above formula is met, it should still meet the requirement of following formula：
NKmax≤1.2Ra2
Earthquake load effects and load effect standard combination：
Under the vertical force effect of axle center
NEK≤1.25Ra2
Under eccentric vertical force effect, in addition to above formula is met, it should still meet the requirement of following formula：
NEKmax≤1.5Ra2
N in formulaK--- under the effect of load effect standard combination axle center vertical force, the average vertical force of foundation pile；NKmax--- lotus
It carries under the effect of effect standard combination bias vertical force, stake top maximum vertical power；NEK--- earthquake load effects and load effect mark
Under quasi- combination, the average vertical force of foundation pile；NEKmax--- under earthquake load effects and load effect standard combination, stake top maximum is erected
Xiang Li；Ra2--- foundation pile vertical bearing capacity characteristic value.Further determine that engineering pile vertical bearing capacity of single pile characteristic value Ra=min
(Ra1,Ra2)。
2nd, then, it is determined that test pile ultimate vertical bearing capacity standard value Quk, take test pile ultimate vertical bearing capacity standard value Quk
=2Ra(safety coefficient K=2).
3rd, further, checking computations test pile pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value Ru；
According to《Loading code for design of building structures》(GB 50009-2012) (hereinafter referred to as " load code ") defines, accidental lotus
Load refers to not necessarily occur within structure design service life, and once occurs that its magnitude is very big, and the lotus that the duration is very short
It carries.The ultimate vertical bearing capacity standard value operating mode that pile body is born during test pile meets accidental load definition, can be according to accidental load
Consider.It is corresponding《Code for design of concrete structures》(hereinafter referred to as " concrete specification ") 3.3.4 in (GB 50010-2010)
Item, when carrying out ultimate limit state design to the structure under accidental action, action effect design value S is calculated by accidentally combination,
Coefficient for importance of structure γ0Take the numerical value not less than 1.0；Concrete, reinforcing bar use strength standard value fCk(concrete axle center resists
Compressive Strength standard value), fyk(the yield strength standard value of reinforcing bar).With reference to Pile Foundation Code formula (b) and (c), the pile body limit is pressurized
Bearing capacity calculation value RuCalculation formula determine it is as follows.
1) corresponding formula (b) applicable elements：
Ru=ψCfCAps+0.9fy′kA′s (d)
2) corresponding formula (c) applicable elements：
Ru=ψCfCAps (e)
In formula：
ψC--- foundation pile pile-formation process coefficient, by the 5.8.3 articles regulation value of Pile Foundation Code；
fCk--- test pile pile concrete axial compressive strength standard value；
Aps--- test pile pile body area of section；
f′yk--- the yield strength standard value of test pile pile body lengthways main steel bar；
A′s--- test pile pile body lengthways main steel bar area of section.
With reference to the effect design value S in the 3.2.6 articles of load code, accidentally combined about loadd, for bearing capacity pole
The effect design value calculation formula 3.2.6-1 of state computation is limited, can use Sd=Quk.With pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value
RuCorresponding load case is vertical ultimate bearing capacity of single pile standard value Quk。
4th, it is last, analysis verification pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value RuWith vertical ultimate bearing capacity of single pile standard value
Quk；
(1), such as pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value RuNot less than vertical ultimate bearing capacity of single pile standard value Quk, can be with
It determines to meet test pile bearing capacity of pile requirement；
(2) such as vertical ultimate bearing capacity of single pile standard value QukMore than pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value Ru, checking computations are not
It meets the requirements, test pile can take different concrete strength of pile and pile body arrangement of reinforcement, increase concrete strength of pile etc. from engineering pile
Grade or pile body arrangement of reinforcement value, again pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value Ru, until Ru≥Quk, meet bearing capacity of pile requirement.
After adopting the above technical scheme, the present invention has the beneficial effect that：It can readily determine that the test pile pile body limit is pressurized
Bearing capacity calculation value Ru, the strength grade of concrete and vertical muscle of checking computations and allocation project stake test pile pile body, accomplish safe, suitable accordingly
With, it is economical, ensure the optimization of the designing quality of engineering pile test pile pile body.
Description of the drawings
It in order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be apparent that, the accompanying drawings in the following description is some embodiments of the embodiment of the present invention, for ability
For the those of ordinary skill of domain, without creative efforts, it can also be obtained according to these attached drawings other attached
Figure.
Fig. 1 is the implementation steps flow chart of the present invention.
Specific embodiment
Referring to shown in Fig. 1, present embodiment includes the following steps：The first step：Determine relevant calculating parameter.It is described
Parameter mainly includes：(1) test pile pile concrete axial compressive strength standard value fCk；(2) surrender of test pile pile body lengthways main steel bar
Strength standard value f 'yk；(3) test pile pile body lengthways main steel bar area of section A 's；(4) test pile pile body area of section Aps；(5) test pile base
Pile forming technology coefficient ψC；(6) the vertical bearing capacity of single pile characteristic value R that the bearing value of stake is calculated according to foundation soila1；
(7) under load effect standard combination, corresponding foundation pile vertical bearing capacity characteristic value Ra2.Second step:Determine that engineering pile single pile erects
To characteristic load bearing capacity Ra.According to foundation soil to the bearing value of stake, the vertical bearing capacity of single pile characteristic value R being calculateda1；
Under load effect standard combination, foundation pile vertical bearing capacity characteristic value R is checkeda2；Further determine that Ra=min (Ra1,Ra2).The
Three steps:Test pile ultimate vertical bearing capacity standard value Quk, take test pile ultimate vertical bearing capacity standard value Quk=2Ra.4th step:Checking computations
Test pile pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value Ru, it is ensured that Ru≥Quk, such as it is unsatisfactory for, adjusts test pile concrete strength of pile and stake
Body arrangement of reinforcement, until meeting test pile bearing capacity of pile requirement.
Example is cast-in-situ bored pile, and section is φ 1000mm, and the long 75m of stake, pile concrete processed is C40.12 Φ of pile body arrangement of reinforcement
20 (HRB400 grades), 8@200 of tie hoop φ, the spiral stirrup spacing of pile body of 5m ranges below stake top are encrypted as 100mm.
The first step：Determine following parameter
fCk=26.8N/mm2, f 'y=360N/mm2, f 'yk=400N/mm2, A 's=3770mm2, Aps=785398mm2,
ψC=0.75；
The vertical bearing capacity of single pile characteristic value R that the bearing value of stake is calculated according to foundation soila1=10500kN；Lotus
It carries under the effect of effect standard combination, checking computations obtain vertical bearing capacity of single pile characteristic value Ra2=9593kN.
Third walks:Determine engineering pile vertical bearing capacity of single pile characteristic value Ra, vertical bearing capacity of single pile characteristic value Ra=min
(Ra1,Ra2)=min (10500kN, 9593kN)=9593kN.
4th step:Test pile ultimate vertical bearing capacity standard value Quk, test pile ultimate vertical bearing capacity standard value Quk=2Ra=2
× 9593=19186kN.
5th step:Check test pile pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value Ru, Ru=ψCfCAps+0.9f′ykA′s。
Correlation computations parameter is substituted into, R is calculatedu=17144kN<Quk=19186kN, test pile pile body limit compression load
Power calculated value is unsatisfactory for the loading requirement of test pile load.
Then, test pile concrete strength of pile grade is improved by C40 to C45, pile body arrangement of reinforcement is by 12 Φ, 20 (HRB400
Grade) it improves to 12 Φ 25 (HRB400 grades), test pile pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value is checked again.
Corresponding to parameter adjustment is：fCk=29.6N/mm2, A ＇s=5890mm2。
Again correlation computations parameter is substituted into, R is calculatedu=19556kN>Quk=19186kN, the test pile pile body limit are pressurized
Bearing capacity calculation value meets the loading requirement of test pile load.
After adopting the above technical scheme, the present invention has the beneficial effect that：It can readily determine that the test pile pile body limit is pressurized
Bearing capacity calculation value Ru, the strength grade of concrete and vertical muscle of checking computations and allocation project stake test pile pile body, accomplish safe, suitable accordingly
With, it is economical, ensure the optimization of the designing quality of engineering pile test pile pile body.
The above is merely illustrative of the technical solution of the present invention and unrestricted, and those of ordinary skill in the art are to this hair
The other modifications or equivalent replacement that bright technical solution is made, without departing from the spirit and scope of technical solution of the present invention,
It is intended to be within the scope of the claims of the invention.
Claims (4)
1. a kind of Analysis of Bearing Capacity method of pile body under engineering pile test pile operating mode, it is characterised in that it is realized by following steps：First,
First, engineering pile vertical bearing capacity of single pile characteristic value R is determineda；2nd, then, it is determined that test pile ultimate vertical bearing capacity standard value Quk；
3rd, further, checking computations test pile pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value Ru；4th, it is last, analysis verification pile body limit compression load
Power calculated value RuWith vertical ultimate bearing capacity of single pile standard value Quk。
2. the Analysis of Bearing Capacity method of pile body under a kind of engineering pile test pile operating mode according to claim 1, it is characterised in that：
Determine engineering pile vertical bearing capacity of single pile characteristic value RaWhen, (1) according to foundation soil to the bearing value of stake, according to Pile Foundation Code phase
Close calculation formula, the vertical bearing capacity of single pile characteristic value R being calculateda1；(2) under load effect standard combination, according to pile foundation
Load effect standard combination in the 5.2.1 articles of specification：The lower N of axle center vertical force effectk≤Ra2；Under eccentric vertical force effect, remove
Meet outside above formula, should still meet the requirement of following formula：Nkmax≤1.2Ra2；Earthquake load effects and load effect standard combination：Axle center
The lower N of vertical force effectEk≤1.25Ra2；Under eccentric vertical force effect, in addition to above formula is met, it should still meet the requirement of following formula：NEkmax
≤1.5Ra2。
3. the Analysis of Bearing Capacity method of pile body under a kind of engineering pile test pile operating mode according to claim 1, it is characterised in that：
Take test pile ultimate vertical bearing capacity standard value Quk=2Ra(safety coefficient K=2).
4. the Analysis of Bearing Capacity method of pile body under a kind of engineering pile test pile operating mode according to claim 1, it is characterised in that：
Analysis verification pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value RuWith vertical ultimate bearing capacity of single pile standard value QukWhen, as the pile body limit by
Press bearing capacity calculation value RuNot less than vertical ultimate bearing capacity of single pile standard value Quk, it may be determined that meeting test pile bearing capacity of pile will
It asks；Such as vertical ultimate bearing capacity of single pile standard value QukMore than pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value Ru, it checks and is unsatisfactory for requiring,
Test pile can take different concrete strength of pile and pile body arrangement of reinforcement from engineering pile, increase concrete strength of pile grade or pile body is matched
Muscle value, again pile body limit CALCULATION OF COMPRESSIVE BEARING CAPACITY value Ru, until Ru≥Quk, meet bearing capacity of pile requirement.
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Cited By (2)
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| CN109680730A (en) * | 2018-11-19 | 2019-04-26 | 中国能源建设集团江苏省电力设计院有限公司 | A kind of vertical force on pile calculation method considering foundation pile resistance to compression resistance to plucking stiffness difference |
| CN116341089A (en) * | 2023-05-31 | 2023-06-27 | 中国建筑第六工程局有限公司 | Method for calculating axial allowable bearing capacity of single pile of railway bored friction pile foundation |
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Application publication date: 20180629 |