CN112733368A - Method for calculating characteristic value of bearing capacity at bottom surface of bonding pile composite foundation - Google Patents
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Abstract
The invention discloses a method for calculating a characteristic value of bearing capacity at the bottom surface of a bonding pile composite foundation, which comprises the following implementation processes of: for the bonded pile composite foundation, from the ground, determining the characteristic value R of the vertical bearing capacity of a single pile according to the soil body property around the pile and the strength of the pile bodya1And obtaining the replacement rate m of the piles according to the arrangement form and the spacing of the piles, calculating the bearing capacity of the composite foundation by adopting a standard method, and performing depth correction on the composite foundation according to the foundation burial depth to obtain the bearing capacity at the bottom surface of the foundation. In addition, the bearing capacity of the piles and the bearing capacity of the soil between the piles at the bottom surface of the foundation are respectively calculated, the bearing capacity of the soil between the piles after depth and width correction at the bottom surface of the foundation is considered, and the soil layer property and the pile body strength around the piles are calculated from the bottom surface of the foundationObtaining the characteristic value R of the bearing capacity of the single pilea2And directly adopting a composite foundation bearing capacity calculation formula to calculate the characteristic value of the bearing capacity at the bottom surface of the foundation without correcting the characteristic value. The invention can provide a more reasonable calculation method for the bearing capacity characteristic value of the bottom surface of the composite foundation.
Description
Technical Field
The invention relates to a foundation bearing capacity calculation method, in particular to a method for calculating a bearing capacity characteristic value at the bottom surface of a bonding pile composite foundation.
Background
With the expansion of various construction scales, less and less land can be used for construction. And because the requirement of engineering construction, the requirement of building service function constantly improves, and the place scope that needs to carry out ground processing further enlarges, also improves gradually to the requirement of ground bearing capacity. The composite foundation is a method commonly used in the existing foundation treatment technology, and the composite foundation essentially plays a role of jointly bearing load transmitted from an upper structure by a reinforcement body and a foundation soil body.
In the existing composite foundation bearing capacity calculation, the bearing capacity of a pile body and the bearing capacity of soil between piles are respectively determined, then the two parts of bearing capacity are superposed according to a certain principle, so that the composite foundation bearing capacity is obtained, and when the composite foundation bearing capacity at the bottom surface of a foundation is calculated, the correction of the foundation burial depth is considered. The invention provides a method for calculating a characteristic value of bearing capacity of a foundation bottom surface of a bonded pile composite foundation, which directly calculates the bearing capacity of a pile body at the foundation bottom surface and the bearing capacity of soil among piles after depth and width correction, calculates the characteristic value of the bearing capacity at the foundation bottom surface according to a composite foundation bearing capacity calculation formula, compares the characteristic value with a calculation result of a standard method, and takes the smaller value as a final design parameter. The method has clear concept, can directly and accurately obtain the bearing capacity of the foundation bottom surface, and provides more reasonable design parameters for subsequent design.
Disclosure of Invention
Aiming at the problems, the technical problems to be solved by the invention are as follows: the method for calculating the characteristic value of the bearing capacity of the bottom surface of the bonded pile composite foundation is provided, and aims to solve the problem that the bearing capacity of the foundation is indirectly obtained through depth correction in the conventional calculation method and cannot be directly calculated.
The technical method adopted by the invention is as follows: a method for calculating a characteristic value of bearing capacity at the bottom surface of a bonding pile composite foundation base comprises the following steps:
the method comprises the following steps: for the bonded pile composite foundation, the replacement rate m of the piles can be obtained according to the arrangement form and the spacing of the piles, and the characteristic value R of the vertical bearing capacity of a single pile is determined according to the soil body property around the piles and the strength of the pile bodya1And calculating the bearing capacity of the composite foundation by adopting a standard method, and performing depth correction on the composite foundation according to the foundation burial depth d to obtain the bearing capacity at the bottom surface of the foundation.
fspa1＝fspk+ηdγm(d-0.5)
In the formula: f. ofspkThe characteristic value of the bearing capacity of the composite foundation is obtained; ra1The characteristic value of the vertical bearing capacity of the single pile is obtained; lambda is a single pile bearing capacity exertion coefficient and can be taken according to regional experience; beta is the inter-pile soil bearing capacity exertion coefficient and can be taken according to regional experience; f. ofakThe characteristic value of the bearing capacity of the natural foundation is obtained; f. ofspa1The characteristic value of the bearing capacity of the composite foundation after deep correction is taken as the bottom surface of the foundation; d is the foundation burial depth; etadCorrecting the coefficient for the characteristic value of the bearing capacity of the foundation embedding depth; gamma raymIs the weighted average gravity of the soil above the basal surface.
Step two: from the bottom surface of the foundation, the vertical bearing capacity R of the single pile is determined only by considering the soil layer below the bottom surface of the foundation and the material strength of the pile bodya2And respectively calculating the bearing capacity of the soil between the piles and the piles at the bottom surface of the foundation, and directly calculating the bearing capacity of the composite foundation at the bottom surface of the foundation according to a composite foundation bearing capacity calculation formula. The calculation formula is as follows:
fa＝fak+ηdγm(d-0.5)
in the formula: f. ofaThe corrected characteristic value of the bearing capacity of the foundation is obtained; f. ofakThe characteristic value of the bearing capacity of the natural foundation is obtained; etadThe correction coefficient of the bearing capacity of the foundation of the embedding depth; gamma is the weight of the soil below the ground; gamma raymThe weighted average gravity of the soil above the foundation ground; f. ofspa2The characteristic value of the bearing capacity of the composite foundation at the bottom surface of the foundation; ra2The characteristic value of the vertical bearing capacity of the single pile at the bottom surface of the foundation is obtained.
Step three: and comparing the foundation bearing capacity at the bottom surface of the foundation calculated by the two methods, and taking the smaller value as the final design parameter.
fspa＝min{fspa1，fspa2}
Drawings
Fig. 1 is a pile position plane layout diagram of a bonded pile composite foundation according to an embodiment of the present invention;
FIG. 2 is a schematic diagram illustrating the calculation of the characteristic value of the bearing capacity of the composite foundation after deep correction at the bottom of the foundation according to the embodiment of the present invention;
fig. 3 is a schematic diagram of the direct calculation of the characteristic value of the bearing capacity of the composite foundation at the bottom surface of the foundation in the embodiment of the invention.
Detailed Description
The following will clearly and completely describe the specific embodiments of the technical solution of the present invention.
A method for calculating a characteristic value of bearing capacity at the bottom surface of a bonding pile composite foundation base comprises the following specific implementation processes: for the composite foundation processed by the bonded piles, as shown in fig. 1, when the bearing capacity at the bottom surface of the foundation is calculated by a standard method, the characteristic value of the vertical bearing capacity of a single pile from the ground is determined by the properties of the soil layer around the pile and the strength of the pile body, as shown in fig. 2:
in the formula: ra1To be from groundCalculating the characteristic value of the vertical bearing capacity of the single pile; u. ofpIs the perimeter of the pile; q. q.ssiThe characteristic value of the lateral resistance of the ith layer of soil around the pile is calculated from the ground and can be determined according to regional experience; lpiCalculating the thickness of the ith layer of soil within the pile length range from the ground; alpha is alphapThe coefficient of resistance exertion for the pile end is determined according to regional experience; q. q.spThe characteristic value of the resistance at the pile end is obtained, and the characteristic value of the bearing capacity of the soil at the pile end is obtained; eta is the pile body strength reduction coefficient; f. ofcuCalculating the average value of the cubic compressive strength of the standard maintenance 28d of the pile test block from the ground, and taking the minimum value, namely f, of the multi-layer soilcu＝min{fcu1,fcu2,Λ,fcui,Λ,fcun}；ApIs the cross-sectional area of the pile.
The replacement rate m can be obtained according to the pile arrangement form and the pile arrangement distance, and the bearing capacity characteristic value of the composite foundation after foundation treatment is obtained by combining the formula (1) as follows:
and (3) deeply correcting the bearing capacity characteristic value of the foundation bottom surface by considering the foundation burial depth d, wherein the bearing capacity characteristic value of the foundation bottom surface obtained by the formula (2) is as follows:
fspa1＝fspk+γm(d-0.5) (3)
in addition, the invention provides a method for respectively calculating the bearing capacity of the piles and the bearing capacity of the soil between the piles at the bottom surface of the foundation and directly calculating the bearing capacity of the composite foundation at the bottom surface of the foundation, wherein the bearing capacity of the soil between the piles at the bottom surface of the foundation can be obtained by performing depth correction according to the foundation burial depth d:
fa＝fak+ηdγm(d-0.5) (4)
and calculating the vertical bearing capacity of the pile at the bottom surface of the foundation, and taking the bearing capacities provided by the soil layer and the pile body strength respectively into consideration, wherein the smaller value of the two is obtained. As shown in fig. 3, when calculating the bearing capacity of the soil layer, only the lateral resistance and the end resistance provided by the soil layer below the bottom surface of the foundation are considered, and when calculating the strength of the pile body material to provide the bearing capacity, only the strength of the pile body material below the bottom surface of the foundation is considered. Therefore, the vertical bearing capacity of the pile at the bottom surface of the foundation is as follows:
in the formula: ra2The characteristic value of the vertical bearing capacity of the single pile calculated from the bottom surface of the foundation; u. ofpIs the perimeter of the pile; q. q.ssiThe characteristic value of the lateral resistance of the ith layer soil around the pile is calculated from the bottom surface of the foundation and can be determined according to regional experience; lpiCalculating the thickness of the ith layer of soil within the pile length range from the bottom surface of the foundation; alphapThe coefficient of resistance exertion for the pile end is determined according to regional experience; q. q.spThe characteristic value of the resistance at the pile end is obtained, and the characteristic value of the bearing capacity of the soil at the pile end is obtained; eta is the pile body strength reduction coefficient; f. ofcuCalculating the average value of the cubic compressive strength of the pile body test block standard maintenance 28d from the bottom surface of the foundation, and taking the minimum value, namely f, of the multilayer soilcu＝min{fcu1,fcu2,Λ,fcui,Λ,fcun}；ApIs the cross-sectional area of the pile.
The bearing capacity of the foundation at the bottom surface of the foundation can be directly calculated by the formula (4) and the formula (5).
For the foundation bearing capacity calculated by the two methods, for the sake of conservation, the smaller value is taken as the foundation bearing capacity at the bottom surface of the final foundation, namely:
fspa＝min{fspa1，fspa2} (7)
example (b):
the method comprises the following steps: the replacement rate of the bonded pile composite foundation is 0.2, the pile diameter is 0.6m, the pile length is 10m, the bearing capacity exertion coefficient lambda of a single pile is 0.9, the bearing capacity exertion coefficient beta of soil between piles is 0.5, the pile body strength reduction coefficient eta is 0.25, and the depth correction coefficient eta is 0dTaking 1.0, taking 20k as the average gravity of the foundation and the overlying soil massN/m3The size of the bottom surface of the foundation is 5.0m multiplied by 5.0m, the buried depth of the foundation is 3m, and the parameters of soil layers below the ground are shown in the following table:
according to a standard method, the formula (1), (2) and (3) can calculate the characteristic value f of the bearing capacity of the composite foundation at the bottom surface of the foundationspa1＝171kPa。
Step two: the bearing capacity characteristic value f of the composite foundation at the bottom surface of the foundation can be directly calculated by the formulas (4), (5) and (6)spa2＝167.4kPa。
Step three: the final characteristic value f of the bearing capacity of the composite foundation at the bottom surface of the foundation can be obtained by the formula (7)spa＝167.4kPa。
The invention provides a method for calculating a bearing capacity characteristic value of a bonding pile composite foundation bottom surface, which is used for calculating the bearing capacity of piles and soil among the piles at the foundation bottom surface respectively, considering the bearing capacity of the soil among the piles after depth and width correction at the foundation bottom surface, obtaining a single-pile bearing capacity characteristic value through the soil layer property and the pile body strength around the piles calculated from the foundation bottom surface, and directly calculating the bearing capacity characteristic value of the foundation bottom surface by adopting a composite foundation bearing capacity calculation formula without correcting the characteristic value. And comparing with a standard method, and taking a smaller value as a final design parameter, thereby providing a more reasonable calculation method for the bearing capacity characteristic value of the bottom surface of the composite foundation.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions without creative efforts should be covered within the scope of the present invention.
Claims (1)
1. A method for calculating a characteristic value of bearing capacity at the bottom surface of a bonding pile composite foundation is characterized by comprising the following steps of: the method comprises the following steps:
the method comprises the following steps: for the bonded pile composite foundation, the replacement rate m of the piles can be obtained according to the arrangement form and the spacing of the piles, and the characteristic value R of the vertical bearing capacity of a single pile is determined according to the soil body property around the piles and the strength of the pile bodya1By using normsThe method calculates the bearing capacity of the composite foundation, and carries out deep correction on the composite foundation according to the foundation burial depth d to obtain the bearing capacity at the bottom surface of the foundation;
fspa1＝fspk+ηdγm(d-0.5)
in the formula: f. ofspkThe characteristic value of the bearing capacity of the composite foundation is obtained; ra1The characteristic value of the vertical bearing capacity of the single pile is obtained; lambda is a single pile bearing capacity exertion coefficient and can be taken according to regional experience; beta is the inter-pile soil bearing capacity exertion coefficient and can be taken according to regional experience; f. ofakThe characteristic value of the bearing capacity of the natural foundation is obtained; f. ofspa1The characteristic value of the bearing capacity of the composite foundation after deep correction is taken as the bottom surface of the foundation; d is the foundation burial depth; etadCorrecting the coefficient for the characteristic value of the bearing capacity of the foundation embedding depth; gamma raymThe weighted average gravity of the soil above the bottom surface of the foundation;
step two: from the bottom surface of the foundation, the vertical bearing capacity R of the single pile is determined only by considering the soil layer below the bottom surface of the foundation and the material strength of the pile bodya2Respectively calculating the bearing capacity of the soil between the piles and the bearing capacity of the piles at the bottom surface of the foundation, and directly calculating the bearing capacity of the composite foundation at the bottom surface of the foundation according to a composite foundation bearing capacity calculation formula; the calculation formula is as follows:
fa＝fak+ηdγm(d-0.5)
in the formula: f. ofaThe corrected characteristic value of the bearing capacity of the foundation is obtained; f. ofakThe characteristic value of the bearing capacity of the natural foundation is obtained; etadThe correction coefficient of the bearing capacity of the foundation of the embedding depth; gamma is the weight of the soil below the ground; gamma raymThe weighted average gravity of the soil above the foundation ground; f. ofspa2The characteristic value of the bearing capacity of the composite foundation at the bottom surface of the foundation; ra2At the bottom surface of the foundationA characteristic value of vertical bearing capacity of the single pile;
step three: and comparing the foundation bearing capacity at the bottom surface of the foundation calculated by the two methods, and taking the smaller value as the final design parameter.
fspa＝min{fspa1，fspa2} 。
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Cited By (3)
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| CN115146368A (en) * | 2022-08-08 | 2022-10-04 | 贵州正业工程技术投资有限公司 | Composite foundation design method for dynamic compaction surface layer reinforced gravel pile |
| CN115168973A (en) * | 2022-08-08 | 2022-10-11 | 贵州正业工程技术投资有限公司 | Composite foundation design method for reinforcing broken stone pier by dynamic compaction surface layer |
| CN115221595A (en) * | 2022-08-08 | 2022-10-21 | 贵州正业工程技术投资有限公司 | Composite foundation-based broken stone aggregate pile bearing capacity calculation method |
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| CN115168973A (en) * | 2022-08-08 | 2022-10-11 | 贵州正业工程技术投资有限公司 | Composite foundation design method for reinforcing broken stone pier by dynamic compaction surface layer |
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Application publication date: 20210430 |