CN115221595A - Composite foundation-based broken stone aggregate pile bearing capacity calculation method - Google Patents
Composite foundation-based broken stone aggregate pile bearing capacity calculation method Download PDFInfo
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- 239000002131 composite material Substances 0.000 title claims abstract description 19
- 238000004364 calculation method Methods 0.000 title claims abstract description 9
- 239000002689 soil Substances 0.000 claims abstract description 71
- 238000000034 method Methods 0.000 claims abstract description 28
- 239000008187 granular material Substances 0.000 claims description 13
- 239000000758 substrate Substances 0.000 claims description 6
- 238000009933 burial Methods 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 239000008188 pellet Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
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- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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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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- G—PHYSICS
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- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
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Abstract
The invention provides a method for measuring bearing capacity of a broken stone aggregate pile based on a composite foundation, and belongs to the field of foundation treatment. According to the method for calculating the bearing capacity of the gravel granular pile, the internal friction angle of the gravel granular pile, the cohesive force of soil between piles, the internal friction angle and the weight are obtained through tests, the original stratum gravel granular pile hole forming process is regarded as the process that a soil body is subjected to passive soil pressure, the passive soil pressure of soil around the pile is calculated according to corresponding parameters aiming at different foundation forms and is used as the confining pressure of the gravel granular pile, and then the single pile bearing capacity of the gravel granular pile is further calculated. The invention solves the problem that the bearing capacity of the gravel aggregate pile needs to be estimated empirically during preliminary design, improves the calculation accuracy and precision of the bearing capacity of the gravel aggregate pile, and provides design basis and reference data of composite foundation design for engineering designers.
Description
Technical Field
The invention belongs to the field of foundation treatment, and particularly relates to a method for calculating bearing capacity of a gravel aggregate pile based on a composite foundation.
Background
During construction, a plurality of piles are generally required to be driven into a soft foundation to form a composite foundation, and the foundation is reinforced. The gravel granular pile is extruded into the soil by adopting loose granular materials such as gravel and the like, a dense pile body with a larger diameter is formed in the original foundation, and the composite foundation is formed together with the soil between the piles through the compaction effect to reduce settlement, so that the bearing capacity of the foundation can be obviously improved to meet the requirement of upper building structures. When the broken stone aggregate pile is constructed, the bearing capacity of the broken stone aggregate pile is a basic construction parameter, and the construction parameters such as the pile diameter, the pile length and the like of the broken stone aggregate pile can be determined only on the basis of accurately determining the bearing capacity of the pile.
In the prior art, the bearing capacity of the gravel aggregate pile is usually determined through a field load test, and the bearing capacity value of the gravel aggregate pile is usually estimated in an experience mode during primary design of foundation treatment, but the experience estimation mode requires designers to have rich engineering experience, and is difficult for designers lacking actual engineering experience.
Disclosure of Invention
In view of the above-mentioned defects or shortcomings in the prior art, the present invention aims to provide a method for calculating bearing capacity of a gravel pile based on a composite foundation, which improves accuracy and precision of calculation of bearing capacity of the gravel pile.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a broken stone aggregate pile bearing capacity meter method based on a composite foundation comprises the following steps:
step S1, obtaining the internal friction angle of the gravel granular pile through tests
Cohesion of soil between piles c s Inner angle of friction
And severe gamma s ；
S2, in a foundation treatment primary design stage before carrying out a broken stone aggregate pile load test:
for the gravel granular pile with the independent foundation and the strip foundation, calculating the bearing capacity f of the single pile by the formula (3) pk ：
In the formula (3), D is the foundation burial depth, D is the diameter of the gravel granular pile, delta is the passive soil pressure proportion coefficient, and the value of delta is between 0.01 and 0.05;
for the broken stone aggregate piles of the raft foundation and the box type foundation, calculating the bearing capacity f of a single pile by a formula (6) pk ：
In the formula (6), p is the upper load borne by the soil between piles at the bottom surface of the raft foundation or box foundation.
In the scheme, the single pile bearing capacity f of the broken stone aggregate pile of the independent foundation and the strip foundation is calculated pk When in use, the hole forming process of the broken stone granule pile is regarded as that the retaining wall horizontally extrudes soil around the pile, the horizontal extrusion distance is the radius of the broken stone granule pile is 0.5D, according to the Rankine soil pressure principle, the ratio of the horizontal displacement of the retaining wall to the height of the retaining wall is usually 1% -5% when the soil body reaches the limit balance state of passive soil pressure, the passive soil pressure proportional coefficient delta is set as the ratio, the passive soil pressure depth distribution range of the soil around the broken stone granule pile under the substrate can be obtained to be 0.5D/delta, the passive soil pressure in the depth distribution range is in trapezoidal distribution, and the passive soil pressure at the half depth of the trapezoid is taken as the surrounding pressure e of the broken stone granule pile Pile confining pressure Then the confining pressure e of the gravel pile Pile confining pressure The calculation formula is shown as formula (1).
In the formula (1), D is the foundation burial depth, D is the diameter of the gravel granular pile, delta is the passive soil pressure proportion coefficient, and the value of delta is between 0.01 and 0.05;
according to the confining pressure e of the broken stone granular material pile Pile confining pressure Then calculating the bearing capacity f of the single pile by the formula (2) pk ：
Substituting the formula (1) into the formula (2) to obtain the formula (3).
In the scheme, the single pile bearing capacity f of the gravel aggregate pile of the raft foundation and the box type foundation is calculated pk Firstly, the passive soil pressure e of the soil layer at the depth of 0m below the substrate is calculated by the formula (4) p(0m) ：
In the formula (4), p is the upper load borne by soil between piles at the bottom surface of the raft foundation or box foundation;
for large-area foundation forms such as raft foundation and box foundation, the passive soil pressure e of the soil layer at the depth of 0m below the foundation is considered for safety p(0m) As confining pressure of the broken stone aggregate pile, calculating the bearing capacity f of the single pile by the formula (5) pk ：
Substituting the formula (4) into the formula (5) to obtain the formula (6).
The invention has the following beneficial effects:
according to the method for calculating the bearing capacity of the gravel granular pile based on the composite foundation, the original stratum gravel granular pile hole forming process is regarded as the process that a soil body is subjected to passive soil pressure, the passive soil pressure of the soil around the pile is calculated and is used as the confining pressure of the gravel granular pile to calculate the bearing capacity of the gravel granular pile, meanwhile, a calculation formula of the bearing capacity of the gravel granular pile is given for different foundation forms, and the problem that the bearing capacity of the gravel granular pile needs to be estimated empirically in primary design is solved.
Of course, it is not necessary for any product or method to achieve all of the above-described advantages at the same time for practicing the invention.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a flow chart of a method for calculating bearing capacity of a gravel aggregate pile based on a composite foundation according to an embodiment of the invention;
fig. 2 is a pressure surrounding pressure distribution diagram of the soil around the pile for the independent foundation and the strip foundation in the embodiment of the invention.
Detailed Description
Embodiments of the present invention are described in detail below with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined or explained in subsequent figures. In the description of the present invention, the terms "first," "second," "third," "fourth," and the like are used merely to distinguish one description from another, and are not to be construed as merely or implying relative importance.
Aiming at the problem that the bearing capacity of a crushed stone aggregate pile in a composite foundation cannot be accurately calculated in the prior art, the invention provides a method for calculating the bearing capacity of the crushed stone aggregate pile.
Referring to fig. 1, the method for measuring the bearing capacity of the broken stone aggregate pile based on the composite foundation provided by the embodiment of the invention comprises the following steps:
step S1, obtaining the internal friction angle of the gravel granular pile through tests
Cohesion of soil between piles c s Inner angle of friction
And severe gamma s 。
In this step, when the gravel granular pile adopts different gravel materials or aims at different original foundations, the basic physical parameters are different, so that the gravel granular pile and the related physical parameters of the soil between piles when the current materials are adopted need to be obtained through tests; when the adopted materials or the original foundation are changed, the experiment needs to be carried out again to obtain relevant parameters.
S2, aiming at different forms of foundations, respectively calculating the bearing capacity f of the gravel granular pile single pile in the preliminary design stage of foundation treatment before carrying out the gravel granular pile load test pk 。
As shown in figure 2, the bearing capacity f of the broken stone aggregate pile for the independent foundation and the strip foundation pk Regarding the process of forming the hole by the gravel granular pile as the process of horizontally extruding soil around the pile by the retaining wall, the horizontal extrusion distance is the hole forming radius of 0.5D, according to the Rankine soil pressure principle, if the soil body reaches a passive soil pressure limit balance state, the ratio of the horizontal displacement of the retaining wall to the height of the retaining wall usually reaches 1% -5%, and the passive soil pressure proportional coefficient delta is set as the ratio, so that the passive soil pressure depth distribution range of the soil around the gravel granular pile under the substrate is 0.5D/delta, the passive soil pressure in the depth distribution range is in trapezoidal distribution, and the passive soil pressure at the position of half depth of the trapezoid is taken as the surrounding pressure e of the gravel granular pile Pile confining pressure Then the confining pressure e of the gravel pile Pile confining pressure The calculation formula is shown as formula (1).
In the formula (1), D is the foundation burial depth, D is the diameter of the gravel granular pile, delta is the passive soil pressure proportion coefficient, and the value of delta is between 0.01 and 0.05;
according to the confining pressure e of the broken stone granular material pile Pile confining pressure Then calculating the bearing capacity f of the single pile by the formula (2) pk ：
Substituting formula (1) into formula (2) to obtain formula (3):
bearing capacity f of gravel granular pile single pile for raft foundation and box foundation pk Taking the pressure action of the bottom surface of the raft foundation or the box-type foundation on the soil between the piles into consideration, calculating the passive soil pressure e of the soil layer at the depth of 0m below the foundation p(0m) ，e p(0m) The calculation formula (4) is as follows:
in the formula (4), p is the upper load borne by soil between piles at the bottom surface of the raft foundation or the box-type foundation.
For large-area foundation forms such as raft foundation and box foundation, the passive soil pressure e of the soil layer at the depth of 0m below the foundation is taken into consideration for safety p(0m) As confining pressure of the broken stone aggregate pile, calculating the bearing capacity f of the single pile by the formula (5) pk ：
Substituting formula (4) into formula (5) to obtain formula (6):
according to the technical scheme, the broken stone granule pile hole forming process provided by the embodiment of the invention is a process of driving broken stone granules into a stratum through a certain construction method, the soil body can be horizontally extruded in the driving process, the extruding effect is similar to that of a retaining wall extruding the soil body behind the wall so as to achieve a passive soil pressure ultimate balance state, but only the deep soil body at the lower part of the base can be extruded to the passive soil pressure ultimate balance state due to limited horizontal displacement in the extruding process.
The above description is only a preferred embodiment of the invention and an illustration of the applied technical principle and is not intended to limit the scope of the claimed invention but only to represent a preferred embodiment of the invention. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
Claims (6)
1. A broken stone aggregate pile bearing capacity measuring method based on a composite foundation is characterized by comprising the following steps:
step S1, obtaining the internal friction angle of the gravel aggregate pile through tests
Cohesion of soil between piles c s Inner angle of friction
And severe gamma s ；
S2, in a foundation treatment primary design stage before carrying out a broken stone aggregate pile load test:
for the gravel granular pile with the independent foundation and the strip foundation, calculating the bearing capacity f of the single pile by the formula (3) pk ：
In the formula (3), D is the foundation burial depth, D is the diameter of the gravel granular pile, delta is the passive soil pressure proportion coefficient, and the value of delta is between 0.01 and 0.05;
for the broken stone aggregate piles of the raft foundation and the box type foundation, calculating the bearing capacity f of a single pile by a formula (6) pk ：
In the formula (6), p is the upper load borne by the soil between piles at the bottom surface of the raft foundation or box foundation.
2. The composite foundation-based broken stone granule pile bearing capacity measuring method according to claim 1, characterized in that the single pile bearing capacity f of the broken stone granule pile of the independent foundation and the strip foundation is calculated pk When in use, the hole forming process of the granular stone pile is regarded as that the retaining wall horizontally extrudes soil around the pile, the horizontal extrusion distance is the radius of the granular stone pile is 0.5D, according to the Rankine soil pressure principle, if the soil body reaches a passive soil pressure limit balance state, the ratio of the horizontal displacement of the retaining wall to the height of the retaining wall is 1% -5%, the passive soil pressure proportional coefficient delta is set as the ratio, the passive soil pressure depth distribution range of the soil around the pile under the substrate is 0.5D/delta, the passive soil pressure in the depth distribution range is in trapezoidal distribution, and the passive soil pressure at the half depth of the trapezoid is taken as the confining pressure e of the granular stone pile Pile confining pressure (ii) a And then according to the confining pressure e of the gravel granular pile Pile confining pressure Calculating the bearing capacity f of a single pile pk 。
3. Composite foundation based crushed stone aggregate pile according to claim 2The method of the load gauge is characterized in that the gravel aggregate pile confining pressure e Pile confining pressure The calculation formula is shown as formula (1):
in the formula (1), D is the foundation burial depth, D is the diameter of the gravel granular pile, and delta is the passive soil pressure proportionality coefficient.
4. The composite foundation based broken stone pellet pile bearing capacity measuring method of claim 3, wherein the value of δ is between 0.01 and 0.05.
5. The composite foundation-based broken stone granule pile bearing capacity measuring method according to claim 3, characterized in that according to broken stone granule pile confining pressure e Pile confining pressure Then calculating the bearing capacity f of the single pile by the formula (2) pk ：
Substituting the formula (1) into the formula (2) to obtain the formula (3).
6. The composite foundation based gravel pile bearing capacity measuring method according to claim 1, wherein the single pile bearing capacity f of the gravel piles of the raft foundation and the box foundation is calculated pk Firstly, the passive soil pressure e of the soil layer at the depth of 0m below the substrate is calculated by the formula (4) p(0m) ：
In the formula (4), p is the upper load borne by soil between piles at the bottom surface of the raft foundation or box foundation;
for large-area foundation forms such as raft foundations and box foundations, the safety is achievedConsidering the passive soil pressure e of the soil layer at the depth of 0m below the substrate p(0m) As confining pressure of the broken stone aggregate pile, calculating the bearing capacity f of the single pile by the formula (5) pk ：
Substituting equation (4) into equation (5) yields equation (6).
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| CN202210942148.1A CN115221595B (en) | 2022-08-08 | Method for calculating bearing capacity of gravel pellet pile based on composite foundation |
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| CN202210942148.1A CN115221595B (en) | 2022-08-08 | Method for calculating bearing capacity of gravel pellet pile based on composite foundation |
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| CN116108591A (en) * | 2023-04-12 | 2023-05-12 | 西南交通大学 | Landslide stability judging method, landslide stability judging device, landslide stability judging equipment and landslide stability judging medium |
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