CN112329234A - Bridge pile foundation calculation method considering influence of still water - Google Patents
Bridge pile foundation calculation method considering influence of still water Download PDFInfo
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- CN112329234A CN112329234A CN202011220757.3A CN202011220757A CN112329234A CN 112329234 A CN112329234 A CN 112329234A CN 202011220757 A CN202011220757 A CN 202011220757A CN 112329234 A CN112329234 A CN 112329234A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 134
- 238000004364 calculation method Methods 0.000 title claims abstract description 37
- 230000001932 seasonal effect Effects 0.000 claims abstract description 34
- 238000000034 method Methods 0.000 claims abstract description 20
- 239000002689 soil Substances 0.000 claims description 52
- 230000008014 freezing Effects 0.000 claims description 21
- 238000007710 freezing Methods 0.000 claims description 21
- 230000005484 gravity Effects 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 8
- 230000002411 adverse Effects 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 4
- 230000008018 melting Effects 0.000 claims description 4
- 238000002844 melting Methods 0.000 claims description 4
- 229920006395 saturated elastomer Polymers 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
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Abstract
The invention discloses a bridge pile foundation calculation method considering influence of still water, which comprises the following steps of: determining the seasonal frost line depth and the permafrost upper limit depth; vertically dividing a water area; defining the divided regions; calculating the influence of water on the pile foundation in the first area; calculating the influence of water in the second area on the pile foundation; calculating the influence of water in the third area on the pile foundation; and (5) completing the calculation of the bridge pile foundation considering the influence of the still water. The method can be used for calculating the bridge pile foundations of different types in the transportation field, such as railways, roads, municipal works, light rails and the like, and the influence of still water is considered.
Description
Technical Field
The invention belongs to the technical field of bridge engineering in the transportation industry, and particularly relates to a bridge pile foundation calculation method considering influence of still water.
Background
In the calculation of bridge pile foundation, flowing water and still water all can calculate the production influence to the pile foundation, and wherein flowing water pressure calculation is comparatively simple, and still water is comparatively complicated to the influence of pile foundation, and it both can directly influence the bridge pile foundation through dead weight and buoyancy, can again along with geographical position and seasonal variation appear freezing, through ice to the bridge pile foundation production influence, can also produce indirect influence to the pile foundation through soil. When the bridge pile foundation appears in the water area, the calculation can be solved by only modifying one or more input parameters, and people are often stranded to take care of the calculation.
Aiming at the practical problems existing in the calculation of the bridge pile foundation in the water area, a method with clear thought and simple and convenient operation is urgently needed to solve the calculation problem of the influence of still water on the bridge pile foundation.
Disclosure of Invention
The invention is provided for solving the problems in the prior art, and aims to provide a bridge pile foundation calculation method considering influence of still water.
The technical scheme of the invention is as follows: a bridge pile foundation calculation method considering influence of still water comprises the following steps:
A. determining seasonal frost line depth and permafrost upper limit depth
Determining the seasonal frost line depth and the permafrost upper limit depth in the water area, and storing the depths;
B. vertically dividing water area
Vertically dividing a water area by using the seasonal frost line depth and the permafrost upper limit depth; when the seasonal freezing line depth and the permafrost upper limit depth are both in the water area, the two lines divide the water area into three areas, namely an area I, an area II and an area III from top to bottom;
C. defining a partition region
The first region is water with the depth of a seasonal freezing line or more;
the second area is water between the seasonal frost line depth and the permafrost upper limit depth;
water in the area below the upper limit depth of the frozen soil for three or more years;
D. calculating the influence of water on the pile foundation in area one
In the first area, the water is in two states of freezing and melting along with seasonal changes, the influence on the pile foundation is considered according to the most adverse state of freezing, and the influence is taken for pile foundation calculation;
E. calculating the influence of Water in region two on the pile foundation
The water in the second area is always in a liquid state, the pile foundation is influenced in a gravity or buoyancy mode, and the pile foundation calculation is carried out according to the influence;
F. calculating the influence of water in the third zone on the pile foundation
The water in the third area is always in an icing state, the water and the soil are integrated, the pile foundation is influenced in a frozen soil mode, and the pile foundation is calculated according to the influence;
G. and (5) completing the calculation of the bridge pile foundation considering the influence of the still water.
Furthermore, in the step D, the gravity of ice above the top of the bearing platform is taken into account for pile foundation calculation under the condition that water in the area I is frozen.
Furthermore, in the step D, when the water in the area I is frozen, a vertically upward freezing and pulling force is generated, and the freezing and pulling force is detected and calculated.
And furthermore, in the step E, water in a liquid state all the time is added into the pile bottom soil to be permeable for classification calculation.
Furthermore, under the condition that the soil at the bottom of the pile is permeable to water, the gravity of the water above the top of the bearing platform is not considered, and the volume weight of the soil in the water is taken as the floating volume weight.
Furthermore, under the condition that the soil at the bottom of the pile is impermeable, the volume weight of the soil in the water is taken as the saturated volume weight by considering the gravity of the water above the top of the bearing platform.
Furthermore, the influence of the water area freezing on the bridge pile foundation calculation in the step F is specifically as follows:
firstly, the pile circumference limit frictional resistance and the foundation proportion coefficient of the soil are not taken according to the common soil any more and are obtained according to the relevant standards of the frozen soil;
and secondly, the post-construction settlement of the pile foundation is not considered.
Furthermore, the seasonal frost line depth and the permafrost upper limit depth may be outside the range of the pile foundation or the water area, and the first area, the second area and the third area may be present at the same time or only one area may be present.
The invention has the following beneficial effects:
aiming at a bridge pile foundation in a water area, the invention divides water into three areas by utilizing seasonal frost line depth and permafrost upper limit depth; the water above the seasonal freezing line depth can be in two states of freezing and melting along with seasonal changes, and the influence on the pile foundation is considered according to the most adverse state of freezing; the water between the seasonal frost line depth and the permafrost upper limit depth is always in a liquid state, and the pile foundation is influenced in a gravity or buoyancy mode; water below the upper limit depth of the frozen soil is always in an icing state for many years, and the water and the soil are integrated to influence the pile foundation in a frozen soil mode.
The method can be used for calculating the bridge pile foundations of different types in the transportation field, such as railways, roads, municipal works, light rails and the like, and the influence of still water is considered.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
FIG. 2 is a schematic view of the division of the water area according to the present invention;
FIG. 3 is input data regarding water in the present invention;
FIG. 4 is a calculation result of a bridge pile foundation considering influence of still water in the invention;
fig. 5 is a calculation result of the bridge pile foundation without considering influence of the still water in the invention.
Detailed Description
The present invention is described in detail below with reference to the accompanying drawings and examples:
as shown in fig. 1 to 5, a method for calculating a bridge pile foundation considering influence of still water includes the following steps:
A. determining seasonal frost line depth and permafrost upper limit depth
Determining the seasonal frost line depth and the permafrost upper limit depth in the water area, and storing the depths;
B. vertically dividing water area
Vertically dividing a water area by using the seasonal frost line depth and the permafrost upper limit depth; when the seasonal freezing line depth and the permafrost upper limit depth are both in the water area, the two lines divide the water area into three areas, namely an area I, an area II and an area III from top to bottom;
C. defining a partition region
The first region is water with the depth of a seasonal freezing line or more;
the second area is water between the seasonal frost line depth and the permafrost upper limit depth;
water in the area below the upper limit depth of the frozen soil for three or more years;
D. calculating the influence of water on the pile foundation in area one
In the first area, the water is in two states of freezing and melting along with seasonal changes, the influence on the pile foundation is considered according to the most adverse state of freezing, and the influence is taken for pile foundation calculation;
E. calculating the influence of Water in region two on the pile foundation
The water in the second area is always in a liquid state, the pile foundation is influenced in a gravity or buoyancy mode, and the pile foundation calculation is carried out according to the influence;
F. calculating the influence of water in the third zone on the pile foundation
The water in the third area is always in an icing state, the water and the soil are integrated, the pile foundation is influenced in a frozen soil mode, and the pile foundation is calculated according to the influence;
G. and (5) completing the calculation of the bridge pile foundation considering the influence of the still water.
And D, taking the gravity of ice above the top of the bearing platform into the pile foundation for calculation under the condition that water in the area I is frozen in the step D.
D, generating a vertically upward freeze-drawing force in the frozen state of the water in the area I in the step D, and detecting and calculating the freeze-drawing force.
And E, adding water in a liquid state all the time, and performing classified calculation on whether the soil at the bottom of the pile is permeable or not.
Under the condition that the soil at the bottom of the pile is permeable, the gravity of water above the top of the bearing platform is not considered, and the volume weight of the soil in the water is taken as the floating volume weight.
And under the condition that the soil at the bottom of the pile is impermeable, taking the gravity of water above the top of the bearing platform into consideration, and taking the volume weight of the soil in the water into the saturated volume weight.
The principle is suitable for the pile bottom in the second area, and when the pile bottom falls in the third area, the waterproof condition of the pile bottom soil is considered.
The influence of the water area freezing on the calculation of the bridge pile foundation in the step F is specifically as follows:
firstly, the pile circumference limit frictional resistance and the foundation proportion coefficient of the soil are not taken according to the common soil any more and are obtained according to the relevant standards of the frozen soil;
and secondly, the post-construction settlement of the pile foundation is not considered.
The seasonal frost line depth and the permafrost upper limit depth may be outside the range of the pile foundation or the water area, and the first area, the second area and the third area may be present at the same time or only one area may be present.
Specifically, the area is water above the seasonal frost line depth, the water can be in two states of icing and thawing along with seasonal changes, and the influence on the pile foundation is considered according to the most adverse condition of icing. The influence of the water in the region on the calculation of the bridge pile foundation has two points:
1. the vertical downward gravity is increased, the gravity of ice above the top of the bearing platform is counted, and the gravity of ice below the bottom of the bearing platform is not counted;
2. the vertical upward freeze-drawing force is generated, the tangential frost heaving strength of the bridge structure due to the icing of the soil can be obtained according to the related specification of the type of the soil, and the tangential frost heaving strength of the bridge structure due to the icing of the water can be 190 kPa.
The second area is water between the seasonal frost line depth and the permafrost upper limit depth, the water is always in a liquid state, the influence of the water in the second area on the bridge pile foundation is different according to whether the bottom soil of the pile is permeable or not,
1. when the soil at the bottom of the pile is permeable, the gravity of water above the top of the bearing platform is not considered, and the volume weight of the soil in the water is taken as the floating volume weight;
2. when the soil at the bottom of the pile is impermeable, the gravity of the water above the top of the bearing platform is considered, and the volume weight of the soil in the water is the saturated volume weight.
The principle is suitable for the pile bottom in the second area, and when the pile bottom falls in the third area, the waterproof condition of the pile bottom soil is considered.
The third area is water with the upper limit depth of the frozen soil for many years, the water is always in the frozen state, the water and the soil are integrated, and the pile foundation is influenced in the form of the frozen soil:
1. the pile circumference limit frictional resistance and the foundation proportion coefficient of the soil are not taken according to general soil any more, and the pile circumference limit frictional resistance and the foundation proportion coefficient are obtained by checking relevant standards of frozen soil;
2. the post-construction settlement of the pile foundation is not considered.
Example one
Eight 1m pile foundations with ground height 117.588m and water level height 120.000m are located in a permafrost region, the upper limit depth of the permafrost is 30m, the seasonal frost line depth is 3m, and the influence of still water on the pile foundations is considered.
The calculation of the pile foundation according to the algorithm of the patent is shown in the attached figure 3 for the part of input parameters related to water in the previous example, the calculation result is shown in the attached figure 4, and the result of the pile foundation without considering the influence of the still water is shown in the attached figure 5 for the purpose of explaining the effect.
The comprehensive results show that the difference of pile lengths is 16m, which indicates that the influence of still water on the pile foundation is great and needs to be considered seriously.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (8)
1. A bridge pile foundation calculation method considering influence of still water is characterized by comprising the following steps: the method comprises the following steps:
(A) determining seasonal frost line depth and permafrost upper limit depth
Determining the seasonal frost line depth and the permafrost upper limit depth in the water area, and storing the depths;
(B) vertically dividing water area
Vertically dividing a water area by using the seasonal frost line depth and the permafrost upper limit depth; when the seasonal freezing line depth and the permafrost upper limit depth are both in the water area, the two lines divide the water area into three areas, namely an area I, an area II and an area III from top to bottom;
(C) defining a partition region
The first region is water with the depth of a seasonal freezing line or more;
the second area is water between the seasonal frost line depth and the permafrost upper limit depth;
water in the area below the upper limit depth of the frozen soil for three or more years;
(D) calculating the influence of water on the pile foundation in area one
In the first area, the water is in two states of freezing and melting along with seasonal changes, the influence on the pile foundation is considered according to the most adverse state of freezing, and the influence is taken for pile foundation calculation;
(E) calculating the influence of Water in region two on the pile foundation
The water in the second area is always in a liquid state, the pile foundation is influenced in a gravity or buoyancy mode, and the pile foundation calculation is carried out according to the influence;
(F) calculating the influence of water in the third zone on the pile foundation
The water in the third area is always in an icing state, the water and the soil are integrated, the pile foundation is influenced in a frozen soil mode, and the pile foundation is calculated according to the influence;
(G) and (5) completing the calculation of the bridge pile foundation considering the influence of the still water.
2. The method for calculating the bridge pile foundation considering the influence of the still water according to claim 1, wherein the method comprises the following steps: and D, taking the gravity of ice above the top of the bearing platform into the pile foundation for calculation under the condition that water in the area I is frozen in the step D.
3. The method for calculating the bridge pile foundation considering the influence of the still water according to claim 1, wherein the method comprises the following steps: d, generating a vertically upward freeze-drawing force in the frozen state of the water in the area I in the step D, and detecting and calculating the freeze-drawing force.
4. The method for calculating the bridge pile foundation considering the influence of the still water according to claim 1, wherein the method comprises the following steps: and E, adding water in a liquid state all the time, and performing classified calculation on whether the soil at the bottom of the pile is permeable or not.
5. The method for calculating the bridge pile foundation considering the influence of the still water according to claim 4, wherein the method comprises the following steps: under the condition that the soil at the bottom of the pile is permeable, the gravity of water above the top of the bearing platform is not considered, and the volume weight of the soil in the water is taken as the floating volume weight.
6. The method for calculating the bridge pile foundation considering the influence of the still water according to claim 4, wherein the method comprises the following steps: and under the condition that the soil at the bottom of the pile is impermeable, taking the gravity of water above the top of the bearing platform into consideration, and taking the volume weight of the soil in the water into the saturated volume weight.
7. The method for calculating the bridge pile foundation considering the influence of the still water according to claim 1, wherein the method comprises the following steps: the influence of the water area freezing on the calculation of the bridge pile foundation in the step F is specifically as follows:
firstly, the pile circumference limit frictional resistance and the foundation proportion coefficient of the soil are not taken according to the common soil any more and are obtained according to the relevant standards of the frozen soil;
and secondly, the post-construction settlement of the pile foundation is not considered.
8. The method for calculating the bridge pile foundation considering the influence of the still water according to claim 1, wherein the method comprises the following steps: the seasonal frost line depth and the permafrost upper limit depth may be outside the range of the pile foundation or the water area, and the first area, the second area and the third area may be present at the same time or only one area may be present.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4818148A (en) * | 1985-05-14 | 1989-04-04 | Nippon Kokan Kabushiki Kaisha | Frost damage proofed pile |
| CN104895125A (en) * | 2015-06-09 | 2015-09-09 | 武汉大学 | Apparatus and method for remote real-time on-line monitoring and assessment of pile foundation stability in freezing-thawing environment |
| CN111676836A (en) * | 2020-04-22 | 2020-09-18 | 青海路拓工程设施制造集团有限公司 | Reinforcing construction method for corrugated steel of existing old small bridges and culverts |
-
2020
- 2020-11-05 CN CN202011220757.3A patent/CN112329234B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4818148A (en) * | 1985-05-14 | 1989-04-04 | Nippon Kokan Kabushiki Kaisha | Frost damage proofed pile |
| CN104895125A (en) * | 2015-06-09 | 2015-09-09 | 武汉大学 | Apparatus and method for remote real-time on-line monitoring and assessment of pile foundation stability in freezing-thawing environment |
| CN111676836A (en) * | 2020-04-22 | 2020-09-18 | 青海路拓工程设施制造集团有限公司 | Reinforcing construction method for corrugated steel of existing old small bridges and culverts |
Non-Patent Citations (3)
| Title |
|---|
| SONG，J QIANG: "《Pile Foundation Antifreezing Measures Research in Seasonal Frozen Soil Region》", 《 SCIENTIFIC.NET 》 * |
| 宁贵霞等: "《多年冻土区冻土上限下移对桥梁桩基中基桩受力的效果分析》", 《兰州交通大学学报》 * |
| 栾红: "《冻土地区桥梁桩基冻结强度试验研究》", 《城市道桥与防洪》 * |
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