CN114991112A - Foundation construction method for eliminating loess collapsibility - Google Patents
Foundation construction method for eliminating loess collapsibility Download PDFInfo
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- CN114991112A CN114991112A CN202210719301.4A CN202210719301A CN114991112A CN 114991112 A CN114991112 A CN 114991112A CN 202210719301 A CN202210719301 A CN 202210719301A CN 114991112 A CN114991112 A CN 114991112A
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- 238000010276 construction Methods 0.000 title claims abstract description 66
- 239000002689 soil Substances 0.000 claims abstract description 66
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 44
- 238000005056 compaction Methods 0.000 claims abstract description 25
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 20
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 20
- 239000004571 lime Substances 0.000 claims abstract description 20
- 238000011049 filling Methods 0.000 claims abstract description 10
- 239000000463 material Substances 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 19
- 230000002787 reinforcement Effects 0.000 claims description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 238000005070 sampling Methods 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 239000002699 waste material Substances 0.000 claims description 9
- 239000002245 particle Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 239000000945 filler Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000013329 compounding Methods 0.000 description 4
- 238000007596 consolidation process Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000001556 precipitation Methods 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
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- 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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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Agronomy & Crop Science (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention provides a foundation construction method for eliminating loess collapsibility, which comprises the following steps: detecting a foundation field before pile construction; step two: dividing the foundation into a plurality of different foundation reinforcing areas, wherein the foundation reinforcing areas are divided into a side reinforcing area and a middle reinforcing area; step three: filling materials in the pile hole; step four: detecting the compaction coefficient of soil between piles, the collapsibility coefficient of soil between piles and the compactness of the piles, thereby determining the reinforcing effect of the piles; according to the invention, the middle reinforcing area is arranged at the edge of the collapsible foundation for supporting, the middle reinforcing area is provided with three rows of lime soil compaction piles with the distance of 4.2mm, the side of the foundation can be effectively supported, the middle part of the collapsible foundation is provided with three rows of mixed reinforcing pile foundations with the distance of 3.8mm, a mixed material foundation pile is arranged every two lime soil compaction piles, and the mixed reinforcing pile foundations are filled with building garbage and loess, so that the construction cost can be remarkably reduced and the construction efficiency is improved while the supporting strength is ensured.
Description
Technical Field
The invention belongs to the technical field of foundation treatment, and relates to a foundation construction method for eliminating loess collapsibility.
Background
The annual average precipitation of loess distribution areas is 250-500 mm, the loess is soaked by water under the action of self weight or certain load, and the structure of the loess is rapidly destroyed to generate obvious additional settlement, which is a special property of the loess, so that the construction on the collapsible loess site is carried out, and comprehensive measures mainly including foundation treatment are adopted to improve the bearing capacity of the foundation according to the importance of buildings, the size of the soaking possibility of the foundation by water and the strict degree of limitation on uneven settlement during use so as to prevent the damage to the buildings.
The common foundation treatment methods include: the soil or lime soil cushion layer, the soil pile or lime soil pile, the dynamic compaction method, the heavy hammer tamping method, the pile foundation, the pre-soaking method and other foundation treating methods are reasonably selected according to local conditions through technical comparison, the lime soil cushion layer can improve the stress condition of the loess foundation, and more importantly, the lime soil cushion layer has better water and seepage resistance and is a good measure for resisting the collapsible loess foundation from being collapsed and deformed, so the lime soil cushion layer is widely and generally applied.
However, the lime-soil compaction piles are adopted for construction foundation treatment, and compared with the method that the lime-soil compaction piles are directly adopted for construction, the construction difficulty is high, and the construction cost is high.
Disclosure of Invention
The present invention is directed to a method for constructing a foundation to eliminate the collapsibility of loess, so as to solve the problems of the background art.
The purpose of the invention can be realized by the following technical scheme:
a foundation construction method for eliminating loess collapsibility is characterized by comprising the following concrete steps:
the method comprises the following steps: detecting a foundation field before pile construction to obtain the physical and mechanical characteristics of an undisturbed soil foundation before foundation treatment;
step two: dividing a construction foundation field into a plurality of different foundation reinforcing areas, and dividing the foundation reinforcing areas into an edge reinforcing area and a middle reinforcing area;
step three: performing diesel hammer impact pore-forming at the fixing positions of the edge reinforcing region and the middle reinforcing region, and then performing filling treatment inside the pile hole;
step four: after the construction of the pile bodies in the side reinforcing area and the middle reinforcing area is finished, the compaction coefficient of soil between piles, the collapsibility coefficient of soil between piles and the compactness of the pile bodies are detected, and therefore the reinforcing effect of the pile bodies is determined.
In the above-mentioned foundation construction method for eliminating loess collapsibility, in the first step, the concrete operation of detecting the foundation site is as follows:
on the basis of on-site investigation report data, 3 exploratory well positions are uniformly determined in the construction site range, original state soil with different depths is sampled by a drill bit, and physical indexes such as the water content, the soil particle specific gravity, the dry density, the maximum dry density, the saturation, the pore ratio and the like of the original state soil are obtained through experiments, so that the physical and mechanical characteristics of the original state soil of the construction site are known, and the test site is preliminarily evaluated.
In the above-mentioned foundation construction method for eliminating the loess collapsibility, the sampling standards are as follows:
and determining the depth of the exploratory well to be 6 meters according to the original designed pile length, taking 3 groups of soil samples in total in each 1m sampling depth, finally sampling 18 soil samples in total, numbering the soil samples, and bringing the soil samples back to detection.
In the above-mentioned foundation construction method for eliminating loess collapsibility, in the third step, a concrete construction method for performing diesel hammer impact hole forming is as follows:
the method is characterized in that a diesel hammer is adopted to impact a hole, a steel pipe is driven into the soil by a pile driver, the diameter of the steel pipe is the same as that of a pile hole, the compaction of the soil around the pile is gradually improved in the hammering process, the steel pipe is slowly pulled up after the hole forming is completed, and when the hole bottom reaches an effective depth, the filling operation can be carried out.
In the foundation construction method for eliminating the loess collapsibility, the diameter of the rammer is 300mm, the mass of the rammer is 1.5 tons, and the ramming frequency of each layer of filler is 6 times.
In foretell a foundation construction method who eliminates loess collapsibility, the avris consolidates the district and consolidates the pile foundation for three rows and constitute, and three rows of reinforcement pile foundations are all for the crowded stake of lime soil, three rows distance between the reinforcement pile foundation is 4.2 mm.
In foretell ground construction method of eliminating loess collapsibility, the middle part is consolidated the district and is mixed the reinforcement pile foundation composition for three rows, and three rows the distance of mixing between the reinforcement pile foundation is 3.8mm, it includes that two compounding foundation piles and four lime soil compaction piles are constituteed to mix the reinforcement foundation pile, and two compounding foundation piles and four lime soil compaction piles are the even setting of linear type, and two lime soil compaction piles of every interval set up a compounding foundation pile.
In the above-mentioned foundation construction method for eliminating the loess collapsibility, the concrete filling construction method of the mixed material foundation pile is as follows:
the construction waste is crushed to enable the particle size of crushed materials to be smaller than 800 meshes, the processed construction waste is filled into pile holes as coarse aggregate, then the dry loess is filled with fine aggregate to enter the pile holes, six layers are alternately filled, and after each layer is filled, the construction waste is tightly impacted by a hammer.
Compared with the prior art, the foundation construction method for eliminating the loess collapsibility has the advantages that:
support through setting up the middle part consolidation zone in the ground edge of collapsibility, the middle part consolidation zone is three rows of lime soil compaction piles that are 4.2mm apart from, can effectively support the ground avris, set up three rows of mixed reinforcement pile foundations that are 3.8mm apart from in the ground middle part of collapsibility, two lime soil compaction piles of every set up a compounding foundation pile, mixed reinforcement pile foundations adopts building rubbish and loess to fill, when guaranteeing to support intensity, can show and reduce construction cost, and the efficiency of construction is improved.
Drawings
FIG. 1 is a schematic structural view illustrating a foundation construction method for removing the collapsibility of loess according to the present invention.
FIG. 2 is a schematic view showing a structure of a middle reinforcement area of a foundation construction method for removing a collapsibility of loess according to the present invention.
Detailed Description
The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.
A foundation construction method for eliminating loess collapsibility comprises the following specific steps:
the method comprises the following steps: detecting a foundation field before pile construction to obtain the physical and mechanical characteristics of an undisturbed soil foundation before foundation treatment;
step two: dividing a construction foundation field into a plurality of different foundation reinforcing areas, and dividing the foundation reinforcing areas into an edge reinforcing area and a middle reinforcing area;
step three: performing diesel hammer impact pore-forming at the fixed positions of the side reinforcing region and the middle reinforcing region, and then performing filling treatment inside the pile hole;
step four: after the construction of the pile bodies in the side reinforcing area and the middle reinforcing area is finished, the compaction coefficient of soil between piles, the collapsibility coefficient of soil between piles and the compactness of the pile bodies are detected, and therefore the reinforcing effect of the pile bodies is determined.
As shown in fig. 1 and 2, in the first step of the foundation construction method for eliminating the loess collapsibility, the concrete operation of detecting the foundation site is as follows:
on the basis of on-site investigation report data, 3 exploratory well positions are uniformly determined in the construction site range, original state soil with different depths is sampled by a drill bit, and physical indexes such as the water content, the soil particle specific gravity, the dry density, the maximum dry density, the saturation, the pore ratio and the like of the original state soil are obtained through experiments, so that the physical and mechanical characteristics of the original state soil of the construction site are known, and the test site is preliminarily evaluated.
As shown in figures 1 and 2, the foundation construction method for eliminating the loess collapsibility provided by the invention has the following sampling standards:
and determining the depth of the exploratory well to be 6 meters according to the original designed pile length, taking 3 groups of soil samples in total in each 1m sampling depth, finally sampling 18 soil samples in total, numbering the soil samples, and bringing the soil samples back to detection.
As shown in fig. 1 and 2, in the third step, the concrete construction method for forming the holes by the impact of the diesel hammer is as follows:
the method is characterized in that a diesel hammer is adopted to impact a hole, a steel pipe is driven into the soil by a pile driver, the diameter of the steel pipe is the same as that of a pile hole, the compaction of the soil around the pile is gradually improved in the hammering process, the steel pipe is slowly pulled up after the hole forming is completed, and when the hole bottom reaches an effective depth, the filling operation can be carried out.
As shown in figures 1 and 2, the foundation construction method for eliminating the collapsibility of the loess has the advantages that the diameter of the rammer is 300mm, the mass is 1.5 tons, and the ramming frequency of each layer of filler is 6 strokes.
As shown in fig. 1 and 2, in the foundation construction method for eliminating the loess collapsibility, the side reinforcing area is composed of three rows of reinforcing pile foundations, all the three rows of reinforcing pile foundations are lime-soil compaction piles, and the distance between the three rows of reinforcing pile foundations is 4.2 mm.
As shown in fig. 1 and 2, in the foundation construction method for eliminating loess collapsibility, the middle reinforcing area is composed of three rows of mixed reinforcing pile foundations, the distance between the three rows of mixed reinforcing pile foundations is 3.8mm, the mixed reinforcing pile foundations comprise two mixed base piles and four lime soil compaction piles, the two mixed base piles and the four lime soil compaction piles are uniformly arranged in a linear mode, and one mixed base pile is arranged every two lime soil compaction piles.
As shown in figures 1 and 2, the concrete filling construction method of the mixed foundation pile comprises the following steps:
the construction waste is crushed to enable the particle size of crushed materials to be smaller than 800 meshes, the processed construction waste is filled into pile holes as coarse aggregate, then the dry loess is filled with fine aggregate to enter the pile holes, six layers are alternately filled, and after each layer is filled, the construction waste is tightly impacted by a hammer.
Those not described in detail in this specification are within the skill of the art. The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (8)
1. A foundation construction method for eliminating loess collapsibility is characterized by comprising the following specific steps:
the method comprises the following steps: detecting a foundation field before pile construction to obtain the physical and mechanical characteristics of an undisturbed soil foundation before foundation treatment;
step two: dividing a construction foundation field into a plurality of different foundation reinforcing areas, and dividing the foundation reinforcing areas into an edge reinforcing area and a middle reinforcing area;
step three: performing diesel hammer impact pore-forming at the fixing positions of the edge reinforcing region and the middle reinforcing region, and then performing filling treatment inside the pile hole;
step four: after the construction of the pile bodies in the side reinforcing area and the middle reinforcing area is finished, the compaction coefficient of soil between piles, the collapsibility coefficient of soil between piles and the compactness of the pile bodies are detected, and therefore the reinforcing effect of the pile bodies is determined.
2. The foundation construction method for eliminating the loess collapsibility according to claim 1, wherein in the first step, the concrete operations of detecting the foundation field are as follows:
on the basis of on-site investigation report data, 3 exploratory well positions are uniformly determined in the construction site range, original state soil with different depths is sampled by a drill bit, and physical indexes such as the water content, the soil particle specific gravity, the dry density, the maximum dry density, the saturation, the pore ratio and the like of the original state soil are obtained through experiments, so that the physical and mechanical characteristics of the original state soil of the construction site are known, and the test site is preliminarily evaluated.
3. The foundation construction method for eliminating the loess collapsibility as set forth in claim 1, wherein the sampling criteria are as follows:
and determining the depth of the exploratory well to be 6 meters according to the original designed pile length, taking 3 groups of soil samples in total in each 1m sampling depth, finally sampling 18 soil samples in total, numbering the soil samples, and bringing the soil samples back to detection.
4. The foundation construction method for eliminating the loess collapsibility as claimed in claim 1, wherein in the third step, the concrete construction method for forming the hole by the impact of a diesel hammer is as follows:
the method comprises the following steps of adopting a diesel hammer to impact and form a hole, driving a steel pipe into soil by using a pile driver, wherein the diameter of the steel pipe is the same as that of a pile hole, the compaction of the soil around the pile is gradually improved in the hammering process, after the hole is formed, the steel pipe is slowly pulled up, and when the hole bottom reaches an effective depth, the filling operation can be carried out.
5. The method for constructing foundation for eliminating loess collapsibility according to claim 4, wherein the rammer has a diameter of 300mm and a mass of 1.5 tons, and the number of ramming times of each layer of filler is 6.
6. The method for constructing foundation according to claim 1, wherein the side reinforcement area is composed of three rows of reinforcement pile foundations, all three rows of reinforcement pile foundations are lime soil compaction piles, and the distance between the three rows of reinforcement pile foundations is 4.2 mm.
7. The method according to claim 1, wherein the middle reinforcement area is formed by three rows of mixed reinforcement pile foundations, the distance between the three rows of mixed reinforcement pile foundations is 3.8mm, the mixed reinforcement pile foundations comprise two mixed foundation piles and four lime soil compaction piles, the two mixed foundation piles and the four lime soil compaction piles are linearly and uniformly arranged, and one mixed foundation pile is arranged every two lime soil compaction piles.
8. The foundation construction method for eliminating the loess collapsibility as claimed in claim 1, wherein the concrete filling construction method of the mixed material foundation pile is as follows:
the construction waste is crushed to enable the particle size of crushed materials to be smaller than 800 meshes, the processed construction waste is filled into pile holes as coarse aggregate, then the dry loess is filled with fine aggregate to enter the pile holes, six layers are alternately filled, and after each layer is filled, the construction waste is tightly impacted by a hammer.
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| CN202210719301.4A CN114991112B (en) | 2022-06-23 | 2022-06-23 | Foundation construction method for eliminating loess collapsibility |
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| CN202210719301.4A CN114991112B (en) | 2022-06-23 | 2022-06-23 | Foundation construction method for eliminating loess collapsibility |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1098758A (en) * | 1993-08-11 | 1995-02-15 | 沧州市建筑安装工程公司机械施工分公司 | The compacted pile work method of enlarging building refuse is rammed in the weight punching |
| CN101831901A (en) * | 2010-05-13 | 2010-09-15 | 广东省长大公路工程有限公司 | Shallow poor subsoil composite foundation stabilization treatment method |
| CN102839683A (en) * | 2012-09-19 | 2012-12-26 | 山东大学 | Discrete pile-water permeability concrete pile novel binary composite foundation and treatment method of composite foundation |
| JP2014133782A (en) * | 2013-01-08 | 2014-07-24 | Nippon Steel & Sumitomo Metal | Soft soil conditioner, and improvement method of soft soil and improvement method of soft ground using the same |
| CN109778829A (en) * | 2019-03-20 | 2019-05-21 | 安徽省水利水电勘测设计院 | A kind of Deep Thick Soft Ground rigid and flexible pile combines composite foundation with lattice wall |
-
2022
- 2022-06-23 CN CN202210719301.4A patent/CN114991112B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1098758A (en) * | 1993-08-11 | 1995-02-15 | 沧州市建筑安装工程公司机械施工分公司 | The compacted pile work method of enlarging building refuse is rammed in the weight punching |
| CN101831901A (en) * | 2010-05-13 | 2010-09-15 | 广东省长大公路工程有限公司 | Shallow poor subsoil composite foundation stabilization treatment method |
| CN102839683A (en) * | 2012-09-19 | 2012-12-26 | 山东大学 | Discrete pile-water permeability concrete pile novel binary composite foundation and treatment method of composite foundation |
| JP2014133782A (en) * | 2013-01-08 | 2014-07-24 | Nippon Steel & Sumitomo Metal | Soft soil conditioner, and improvement method of soft soil and improvement method of soft ground using the same |
| CN109778829A (en) * | 2019-03-20 | 2019-05-21 | 安徽省水利水电勘测设计院 | A kind of Deep Thick Soft Ground rigid and flexible pile combines composite foundation with lattice wall |
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| CN114991112B (en) | 2024-03-22 |
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