CN114991112B - Foundation construction method for eliminating loess collapsibility - Google Patents
Foundation construction method for eliminating loess collapsibility Download PDFInfo
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- CN114991112B CN114991112B CN202210719301.4A CN202210719301A CN114991112B CN 114991112 B CN114991112 B CN 114991112B CN 202210719301 A CN202210719301 A CN 202210719301A CN 114991112 B CN114991112 B CN 114991112B
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- 238000010276 construction Methods 0.000 title claims abstract description 67
- 239000002689 soil Substances 0.000 claims abstract description 64
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 44
- 238000005056 compaction Methods 0.000 claims abstract description 22
- 238000005728 strengthening Methods 0.000 claims abstract description 16
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 12
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 12
- 239000004571 lime Substances 0.000 claims abstract description 12
- 238000011049 filling Methods 0.000 claims abstract description 11
- 239000002699 waste material Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 4
- 238000000034 method Methods 0.000 claims description 12
- 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
- 239000000945 filler Substances 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000013461 design Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 238000011156 evaluation Methods 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000011835 investigation Methods 0.000 claims description 3
- 230000008569 process Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract 1
- 230000002787 reinforcement Effects 0.000 abstract 1
- 238000002791 soaking Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000013329 compounding Methods 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
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a foundation construction method for eliminating loess collapsibility, which comprises the following steps: detecting a foundation site before pile construction; step two: dividing the foundation into a plurality of different foundation strengthening areas, wherein the foundation strengthening areas are divided into side strengthening areas and middle strengthening areas; step three: filling material treatment is carried out in the pile hole; step four: detecting the soil compaction coefficient between piles, the soil collapse coefficient between piles and the compactness of the piles, so as to determine the reinforcement effect; according to the invention, the collapsible foundation is supported at the edge by arranging the middle reinforcing area, 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 of the collapsible foundation is provided with three rows of mixed reinforcing pile foundations with the distance of 3.8mm, every two lime soil compaction piles are provided with one mixed reinforcing pile foundation, the mixed reinforcing pile foundations are filled with construction waste and loess, the supporting strength is ensured, the construction cost is obviously reduced, and the construction efficiency is improved.
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 average annual precipitation amount in the loess distribution area is between 250mm and 500mm, the loess is soaked by water under the action of dead weight or a certain load, and the structure of the loess is quickly destroyed to generate obvious additional subsidence, which is a special property of loess, so that the loess is constructed on a collapsible loess field, and the comprehensive measures mainly based on foundation treatment are adopted according to the importance of a building, the water soaking possibility of a foundation and the strictness of uneven settlement restriction during use, so that the bearing capacity of the foundation is improved to prevent the damage to the building.
The common foundation treatment methods are: the treatment methods of various foundations such as soil or gray soil cushion layers, soil piles or gray soil piles, dynamic compaction methods, heavy hammer compaction methods, pile foundations, pre-soaking water methods and the like are reasonably selected according to the situation after the technological comparison, and the gray soil cushion layers can improve the stress condition of the loess foundations, and more importantly, have better water-proof and seepage-proof capabilities and are good measures for resisting the collapsible deformation of the collapsible loess foundations, so that the method has wide and common application.
However, the construction foundation treatment is carried out by adopting the gray soil compaction pile, compared with the construction by adopting the plain soil compaction pile directly, the construction difficulty is higher, and the construction cost is higher.
Disclosure of Invention
The present invention is directed to a foundation construction method for eliminating loess collapsibility, so as to solve the problems set forth in the background art.
The aim of the invention can be achieved by the following technical scheme:
the foundation construction method for eliminating loess collapsibility is characterized by comprising the following specific steps of:
step one: detecting a foundation site before pile construction to obtain physical and mechanical properties of an undisturbed soil foundation before foundation treatment;
step two: dividing a construction foundation site into a plurality of different foundation strengthening areas, and dividing the foundation strengthening areas into side strengthening areas and middle strengthening areas;
step three: at the fixed sites of the side reinforcing area and the middle reinforcing area, performing diesel hammer impact hole forming, and then performing filler treatment in the pile hole;
step four: after the construction of the pile bodies in the side reinforcing area and the middle reinforcing area is completed, the soil compaction coefficient between piles of the pile bodies, the soil collapse coefficient between piles and the compactness of the pile bodies are detected, so that the reinforcing effect of the pile bodies is determined.
In the above foundation construction method for eliminating loess collapsibility, in the first step, the specific operation of detecting the foundation site is as follows:
based on site investigation report data, 3 exploratory well positions are uniformly determined in the range of a construction site, drill bits sample undisturbed soil with different depths, physical indexes such as water content, soil particle specific gravity, dry density, maximum dry density, saturation, porosity and the like of the undisturbed soil are obtained through experiments, so that the physical and mechanical characteristics of the undisturbed soil of the construction site are known, and preliminary evaluation is carried out on a test site.
In the foundation construction method for eliminating loess collapsibility, the sampling criteria are as follows:
and determining the depth of the exploratory well to be 6 meters according to the original design pile length, taking a total of 3 groups of soil samples every 1m in the sampling depth, sampling 18 soil samples in total, numbering the soil samples, and carrying the soil samples back to detection.
In the above foundation construction method for eliminating loess collapsibility, in the third step, the 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 the hole, a pile driver is utilized to drive a steel pipe into soil, the diameter of the steel pipe is the same as that of a pile hole, the extrusion tightness of surrounding soil of the pile is gradually improved in the hammering process, the steel pipe is slowly pulled up after the hole is formed, and when the hole bottom reaches the effective depth, the filling operation can be carried out.
In the foundation construction method for eliminating loess collapsibility, the rammer has a diameter of 300mm, a mass of 1.5 tons, and a ramming frequency of 6 shots per layer of filler.
In the foundation construction method for eliminating loess collapsibility, the side reinforcing area is composed of three rows of reinforcing pile foundations, all the three rows of reinforcing pile foundations are soil compaction piles, and the distance between the three rows of reinforcing pile foundations is 4.2mm.
In the foundation construction method for eliminating loess collapsibility, the middle reinforcing area is formed by 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 foundation comprises two mixed foundation piles and four lime soil compaction piles, the two mixed foundation piles and the four lime soil compaction piles are uniformly arranged in a linear manner, and one mixed foundation pile is arranged every two lime soil compaction piles.
In the foundation construction method for eliminating loess collapsibility, the concrete filler construction method of the mixed foundation pile is as follows:
crushing the construction waste to make the particle diameter of crushed materials smaller than 800 meshes, filling the treated construction waste into pile holes as coarse aggregate, then drying loess to fill fine aggregate into the pile holes, alternately filling six layers, and after each layer is filled, adopting hammers to impact tightly.
Compared with the prior art, the foundation construction method for eliminating loess collapsibility has the advantages that:
the foundation edge of collapsibility is supported through setting up middle part reinforced region, and middle part reinforced region is the crowded close stake of three rows of distance of ash soil that is 4.2mm, can effectively support the foundation limit side, sets up three rows of mixed reinforced pile foundations that are 3.8mm apart from at the foundation middle part of collapsibility, sets up a compounding foundation pile every two crowded close stake of ash soil, and mixed reinforced pile foundation adopts building rubbish and loess to pack, when guaranteeing supporting strength, can show reduction construction cost, improves the efficiency of construction.
Drawings
Fig. 1 is a schematic structure view of a foundation construction method for eliminating loess collapsibility according to the present invention.
Fig. 2 is a schematic view showing a structure of a middle reinforced area of a foundation construction method for eliminating loess collapsibility according to the present invention.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
A foundation construction method for eliminating loess collapsibility comprises the following specific steps:
step one: detecting a foundation site before pile construction to obtain physical and mechanical properties of an undisturbed soil foundation before foundation treatment;
step two: dividing a construction foundation site into a plurality of different foundation strengthening areas, and dividing the foundation strengthening areas into side strengthening areas and middle strengthening areas;
step three: at the fixed sites of the side reinforcing area and the middle reinforcing area, performing diesel hammer impact hole forming, and then performing filler treatment in the pile hole;
step four: after the construction of the pile bodies in the side reinforcing area and the middle reinforcing area is completed, the soil compaction coefficient between piles of the pile bodies, the soil collapse coefficient between piles and the compactness of the pile bodies are detected, so that the reinforcing effect of the pile bodies is determined.
As shown in fig. 1 and 2, in a foundation construction method for eliminating loess collapsibility according to the present invention, in a first step, a specific operation for detecting a foundation site is as follows:
based on site investigation report data, 3 exploratory well positions are uniformly determined in the range of a construction site, drill bits sample undisturbed soil with different depths, physical indexes such as water content, soil particle specific gravity, dry density, maximum dry density, saturation, porosity and the like of the undisturbed soil are obtained through experiments, so that the physical and mechanical characteristics of the undisturbed soil of the construction site are known, and preliminary evaluation is carried out on a test site.
As shown in fig. 1 and 2, the foundation construction method for eliminating loess collapsibility of the present invention has the following sampling criteria:
and determining the depth of the exploratory well to be 6 meters according to the original design pile length, taking a total of 3 groups of soil samples every 1m in the sampling depth, sampling 18 soil samples in total, numbering the soil samples, and carrying the soil samples back to detection.
As shown in fig. 1 and 2, the specific construction method for performing impact hole forming by a diesel hammer in the third step of the foundation construction method for eliminating loess collapsibility of the present invention is as follows:
the method is characterized in that a diesel hammer is adopted to impact the hole, a pile driver is utilized to drive a steel pipe into soil, the diameter of the steel pipe is the same as that of a pile hole, the extrusion tightness of surrounding soil of the pile is gradually improved in the hammering process, the steel pipe is slowly pulled up after the hole is formed, and when the hole bottom reaches the effective depth, the filling operation can be carried out.
As shown in fig. 1 and 2, the foundation construction method for eliminating loess collapsibility of the present invention has a diameter of 300mm, a mass of 1.5 tons, and a number of ramming times of 6 shots per layer of filler.
As shown in fig. 1 and 2, according to the foundation construction method for eliminating loess collapsibility, the side reinforcing area is composed of three rows of reinforcing pile foundations, all the three rows of reinforcing pile foundations are soil compaction piles, and the distance between the three rows of reinforcing pile foundations is 4.2mm.
As shown in fig. 1 and 2, according to the foundation construction method for eliminating loess collapsibility, the middle reinforcing area is formed by 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 foundation piles and four lime soil compaction piles, the two mixed foundation piles and the four lime soil compaction piles are uniformly arranged in a linear manner, and one mixed foundation pile is arranged every two lime soil compaction piles.
As shown in fig. 1 and 2, the foundation construction method for eliminating loess collapsibility of the present invention comprises the following concrete filling construction methods of a mixed foundation pile:
crushing the construction waste to make the particle diameter of crushed materials smaller than 800 meshes, filling the treated construction waste into pile holes as coarse aggregate, then drying loess to fill fine aggregate into the pile holes, alternately filling six layers, and after each layer is filled, adopting hammers to impact tightly.
What is not described in detail in this specification is prior art known to those skilled in the art. The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Claims (6)
1. The foundation construction method for eliminating loess collapsibility is characterized by comprising the following specific steps of:
step one: detecting a foundation site before pile construction to obtain physical and mechanical properties of an undisturbed soil foundation before foundation treatment;
step two: dividing a construction foundation site into a plurality of different foundation strengthening areas, and dividing the foundation strengthening areas into side strengthening areas and middle strengthening areas;
step three: at the fixed sites of the side reinforcing area and the middle reinforcing area, performing diesel hammer impact hole forming, and then performing filler treatment in the pile hole;
the side reinforcing areas are formed by 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 4.2mm;
the middle reinforcing area is formed by 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 foundation piles and four lime soil compaction piles, the two mixed foundation piles and the four lime soil compaction piles are uniformly arranged in a linear manner, and one mixed foundation pile is arranged every two lime soil compaction piles;
step four: after the construction of the pile bodies in the side reinforcing area and the middle reinforcing area is completed, the soil compaction coefficient between piles of the pile bodies, the soil collapse coefficient between piles and the compactness of the pile bodies are detected, so that the reinforcing effect of the pile bodies is determined.
2. The foundation construction method for eliminating loess collapsibility as set forth in claim 1, wherein in the first step, the specific operation of detecting the foundation site is as follows:
based on site investigation report data, 3 exploratory well positions are uniformly determined in the range of a construction site, drill bits sample undisturbed soil with different depths, and physical indexes of water content, soil particle specific gravity, dry density, maximum dry density, saturation and porosity ratio of the undisturbed soil are obtained through experiments, so that the physical and mechanical characteristics of the undisturbed soil of the construction site are known, and preliminary evaluation is carried out on a test site.
3. The foundation construction method of 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 design pile length, taking a total of 3 groups of soil samples every 1m in the sampling depth, sampling 18 soil samples in total, numbering the soil samples, and carrying the soil samples back to detection.
4. The foundation construction method for eliminating loess collapsibility as defined in claim 1, wherein in said step three, the 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 the hole, a pile driver is utilized to drive a steel pipe into soil, the diameter of the steel pipe is the same as that of a pile hole, the extrusion tightness of surrounding soil of the pile is gradually improved in the hammering process, the steel pipe is slowly pulled up after the hole is formed, and when the hole bottom reaches the effective depth, the filling operation can be carried out.
5. The foundation construction method of claim 4, wherein the diesel hammer has a ram diameter of 300mm and a mass of 1.5 tons, and the number of ram strokes per layer of filler is 6.
6. The foundation construction method for eliminating loess collapsibility as defined in claim 1, wherein the concrete filler construction method of the mixed foundation pile is as follows:
crushing the construction waste to make the particle diameter of crushed materials smaller than 800 meshes, filling the treated construction waste into pile holes as coarse aggregate, then drying loess to fill fine aggregate into the pile holes, alternately filling six layers, and after each layer is filled, adopting hammers to impact tightly.
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| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN114991112A CN114991112A (en) | 2022-09-02 |
| CN114991112B true CN114991112B (en) | 2024-03-22 |
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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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| CN114991112A (en) | 2022-09-02 |
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