CN112627160A - Construction process of compaction pile for improving water stability - Google Patents
Construction process of compaction pile for improving water stability Download PDFInfo
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- CN112627160A CN112627160A CN202011436082.6A CN202011436082A CN112627160A CN 112627160 A CN112627160 A CN 112627160A CN 202011436082 A CN202011436082 A CN 202011436082A CN 112627160 A CN112627160 A CN 112627160A
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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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- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
A construction technology for the compacted pile with high water stability includes such steps as preparing lime-clay (20-30 vol.%) and 70-80 vol.%) and CaCl2The solution is used for backfilling layer by layer, and simultaneously, the lime soil compaction pile is tamped; due to CaCl2The solution density has little influence on the soil permeability coefficient and is along with CaCl2The solution content is increased, the frost resistance is improved, the lime soil is gradually hardened, the strength among soil particles is increased, the bearing capacity of the compaction pile is improved, and meanwhile, CaCl2The solution improves the cohesive force among soil particles of the lime soil, so that the compactness of the backfill soil is improved; the invention has the advantages of improved water stability, strong cohesive force of pile body particles, strong bearing capacity, low cost and strong practicability.
Description
Technical Field
The invention belongs to a foundation treatment method, and particularly relates to a construction process of a compaction pile for improving water stability.
Background
Most of the soil of the construction site in the collapsible loess region belongs to self-weight collapsible loess, and the foundation treatment mode mainly comprises impact rolling, dynamic compaction, lime-soil compaction piles and the like. For the foundation which can not be treated by dynamic compaction and the like due to limited conditions, lime-soil compaction piles can be adopted for treatment, the foundation treatment mode is mainly characterized in that a steel pipe is driven into the soil by hammering, holes are laterally compacted to form holes, lime soil is filled into the holes in a layered mode and tamped, the deep yellow soil collapsibility is eliminated, the foundation compressibility is reduced, meanwhile, the deep yellow soil collapsibility and the soil among the piles are combined into a composite foundation to improve the bearing capacity of the foundation, the water stability is reduced when the pile body meets a water layer, the cohesive force of soil particles in the compaction piles is reduced, the bearing capacity of the compaction piles is reduced, and the reduction of the bearing capacity of the foundation is preferably influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a construction process of a compaction pile for improving water stability, which can improve the water stability of the compaction pile and improve the deformation resistance of the compaction pile when meeting water; the pile has the advantages of compact pile body, strong water stability, strong bearing capacity, low cost and strong practicability.
In order to achieve the purpose, the invention adopts the following technical scheme:
a construction process of a compaction pile for improving water stability comprises the following steps:
the method comprises the following steps: determining engineering quantity of lime-soil compaction pile
The bottom of the compaction pile is high h10.4-0.5 m, diameter d10.5-0.7 m cone with a height h at the top27.5m-10m, diameter d1The engineering quantity of the compacted pile is as follows:
step two: drilling a pile hole according to the engineering quantity determined in the step one, and then preparing the lime soil
Preparing limestone soil with 20-30% of lime and 70-80% of clay by volume, and uniformly mixing the limestone soil and the clay for backfilling the compaction pile;
step three: configuring CaCl2Solutions, CaCl2Comprises the following components in percentage by mass:
Cacl2 0.1kg-0.15kg
water 3.471L-4.538L
0.1kg-0.15kg of CaCl2Adding into 3.471L-4.538L water, heating until the solution temperature reaches 60-80 deg.C and the concentration reaches 2.8% -3.2%;
step four: backfilling
Before backfilling, bottom ramming is firstly carried out, then the lime soil prepared in the step two is backfilled into the pile hole, and each layer of the lime soil is 0.174m3-0.457m3Adding oneSubcl2The solution is 0.446L-0.586L, then tamping, and backfilling the next layer of soil until the backfilling is completed.
During backfilling, manually matching with a rammer to continuously ram, configuring a cast steel rammer with the diameter of 0.35-0.4 m and the weight of 45-50 kg, wherein the height of the drop hammer is not less than 2m, so that the construction continuity is ensured, the rammer needs to be flat and stable, and the rammer and a pile hole are mutually aligned, so that the rammer can freely fall; the tamping of each layer is not less than 10 hammers.
After the backfilling in the fourth step is finished, the dry density of the pile body 2 of the lime-soil compaction pile is not less than 15.5kN/m, and the compactness of the pile body 2 is not less than 97%; the dry volume weight of the soil between piles is not less than 15kN/m, the average compaction coefficient of the soil between piles is not less than 93 percent, and the minimum compaction coefficient is not less than 88 percent.
Compared with the prior art, the invention has the beneficial effects that:
1. the CaCl is added into the lime soil with 20-30% of lime and 70-80% of clay in volume ratio2The solution improves the water stability of the lime-soil compaction pile, and further improves the cohesive force of particles in the lime-soil compaction pile.
2. Due to CaCl2The density has little influence on the permeability coefficient of the soil body and is along with CaCl2The content is increased, and the permeability coefficient is gradually reduced, so that the lime soil is gradually hardened, the connection force among soil particles is increased, and the bearing capacity of the lime soil compaction pile is improved.
In conclusion, the invention has the advantages of improved water stability, compact pile body, strong bearing capacity, low cost and strong practicability.
Drawings
FIG. 1 is a schematic view of the structure of a compacted pile according to the present invention
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Example 1:
a construction process of a compaction pile for improving water stability comprises the following steps:
step one, determining the engineering quantity
According to the formula, determining the soil extrusionThe pile density engineering quantity is 1.393m3；
Step two: drilling a pile hole according to the engineering quantity determined in the step one, and then preparing the lime soil
Lime is prepared to be 0.279m3Clay of 1.114m3Uniformly mixing, and backfilling the compaction pile;
step three: configuring CaCl2Solutions of
Adding 0.1kgCaCl2Adding into 3.471L water, heating to 60 deg.C to make the concentration reach 2.8%;
step four: backfilling
Bottom ramming is carried out before backfilling, then the pile holes are backfilled with the lime soil prepared in the step two, and each layer of the lime soil is 0.174m3Adding once CaCl2The solution is 0.446L, then is tamped, and then the next layer of soil is backfilled until the backfilling is finished.
Example 2:
a construction process of a compaction pile for improving water stability comprises the following steps:
step one, determining the engineering quantity
According to the formula, the engineering quantity of the lime-soil compaction pile is determined to be 1.5m3；
Step two: drilling a pile hole according to the engineering quantity determined in the step one, and then preparing lime with the lime soil to be 0.3m3Clay of 1.2m3Uniformly mixing, and backfilling the compaction pile;
step three: configuring CaCl2Solutions of
Mixing 0.12kg of CaCl2Adding into 3.6L water, heating to 65 deg.C to make its concentration reach 2.9%;
step four: backfilling
Bottom ramming is carried out before backfilling, then the pile holes are backfilled with the lime soil prepared in the step two, and each layer of the lime soil is 0.188m3Adding once CaCl2The solution is 0.465L, then the rammed soil is tamped, and the next layer of soil is backfilled until the backfilling is completed.
Example 3:
a construction process of a compaction pile for improving water stability comprises the following steps:
step one, determining the engineering quantity
According to a formula, determining the engineering quantity of the lime-soil compaction pile to be 2m3；
Step two: drilling a pile hole according to the engineering quantity determined in the step one, and then preparing lime with the lime soil to be 0.5m3Clay of 1.5m3Uniformly mixing, and backfilling the compacted pile;
step three: configuring CaCl2Solutions of
Adding 0.13kg of CaCl2Adding into 4.04L water, heating to 70 deg.C to make the concentration reach 3.0%;
step four: backfilling
Bottom ramming is carried out before backfilling, then the pile holes are backfilled with the lime soil prepared in the step two, and each layer of the lime soil is 0.25m3Adding once CaCl2The solution is 0.543L, then is tamped, and then the next layer of soil is backfilled until the backfilling is completed.
Example 4:
a construction process of a compaction pile for improving water stability comprises the following steps:
step one, determining the engineering quantity
According to a formula, determining the engineering quantity of the lime-soil compaction pile to be 3m3；
Step two: drilling a pile hole according to the engineering quantity determined in the step one, and then preparing lime with lime soil to prepare lime of 0.75m3Clay of 2.25m3Uniformly mixing, and backfilling the compacted pile;
step three: configuring CaCl2Solutions of
0.14kg of CaCl was added2Adding into 4.213L water, heating to 75 deg.C to reach concentration of 3.1%;
step four: backfilling
Bottom ramming is carried out before backfilling, then the pile holes are backfilled with the lime soil prepared in the step two, and each layer of the lime soil is 0.375m3Adding once CaCl2The solution is 0.544L, then is tamped, and the next layer of soil is backfilled until the backfilling is finishedAfter that, the process is finished.
Example 5:
a construction process of a compaction pile for improving water stability comprises the following steps:
step one, determining the engineering quantity
According to the formula, the engineering quantity of the lime-soil compaction pile is determined to be 3.656m3；
Step two: drilling a pile hole according to the engineering quantity determined in the step one, and then preparing the lime soil
Lime is prepared to be 0.914m3Clay of 2.742m3Uniformly mixing, and backfilling the compacted pile;
step three: configuring CaCl2Solutions of
Adding 0.15kg of CaCl2Adding into 4.538L water, and heating to 80 deg.C to reach concentration of 3.2%;
step four: backfilling
Bottom ramming is carried out before backfilling, then the pile holes are backfilled with the lime soil prepared in the step two, and each layer of the lime soil is 0.457m3Adding once CaCl2The solution is 0.586L, then the ramming is carried out, and the backfilling of the next layer of soil is carried out until the backfilling is completed.
Experiments show that the Cacl has the same dry density2The higher the solution concentration, the better the water stability of the structure, the maximum structural parameters, when CaCl is added2When the concentration of the solution reaches 3.2%, the influence of the water stability of the structure and the concentration of the solution is small, which indicates that the CaCl is added2The joint strength of the sample with a solution concentration of 3.2% has reached a maximum value, and the bearing capacity of the compacted pile is the highest.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A construction process of a compaction pile for improving water stability is characterized by comprising the following steps: the method specifically comprises the following steps:
the method comprises the following steps: determining engineering quantity of lime-soil compaction pile
The bottom of the compaction pile is high h10.4-0.5 m, diameter d10.5-0.7 m cone with a height h at the top27.5m-10m, diameter d1The engineering quantity of the compacted pile is as follows:
step two: drilling a pile hole according to the engineering quantity determined in the step one, and then preparing the lime soil
Preparing limestone soil with 20-30% of lime and 70-80% of clay by volume, and uniformly mixing the limestone soil and the clay for backfilling the compaction pile;
step three: configuring CaCl2Solutions, CaCl2Comprises the following components in percentage by mass:
Cacl2 0.1kg-0.15kg
water 3.471L-4.538L
0.1kg-0.15kg of CaCl2Adding into 3.471L-4.538L water, heating until the solution temperature reaches 60-80 deg.C and the concentration reaches 2.8% -3.2%;
step four: backfilling
Before backfilling, bottom ramming is firstly carried out, then the pile holes are backfilled with the lime soil prepared in the step two, and each layer of the lime soil is 0.174m3-0.457m3Adding once CaCl2The solution is 0.446L-0.586L, then tamping, and backfilling the next layer of soil until the backfilling is completed.
2. The construction process of the compaction pile for improving the water stability according to claim 1, wherein the construction process comprises the following steps: during backfilling, manually matching with a rammer to continuously ram, configuring a cast steel rammer with the diameter of 0.35-0.4 m and the weight of 45-50 kg, wherein the height of the drop hammer is not less than 2m, so that the construction continuity is ensured, the rammer needs to be flat and stable, and the rammer and a pile hole are mutually aligned, so that the rammer can freely fall; the tamping of each layer is not less than 10 hammers.
3. The construction process of the compaction pile for improving the water stability according to claim 1, wherein the construction process comprises the following steps: after the backfilling in the fourth step is finished, the dry density of the pile body (2) of the lime-soil compaction pile is not less than 15.5kN/m, and the compactness of the pile body (2) is not less than 97%; the dry volume weight of the soil between piles is not less than 15kN/m, the average compaction coefficient of the soil between piles is not less than 93 percent, and the minimum compaction coefficient is not less than 88 percent.
4. The construction process of the compaction pile for improving the water stability according to claim 1, wherein the construction process comprises the following steps: the method specifically comprises the following steps:
step one, determining the engineering quantity
According to the formula, the engineering quantity of the lime-soil compaction pile is determined to be 1.393m3；
Step two: drilling a pile hole according to the engineering quantity determined in the step one, and then preparing lime with lime soil to be 0.279m3Clay of 1.114m3Uniformly mixing, and backfilling the compacted pile;
step three: configuring CaCl2Solutions of
0.1kg of CaCl2Adding into 3.471L water, heating to 60 deg.C to make the concentration reach 2.8%;
step four: backfilling
Before backfilling, bottom ramming is firstly carried out, then the lime soil prepared in the step two is backfilled into the pile hole, and each layer of the lime soil is 0.174m3Adding once CaCl2The solution is 0.446L, then is tamped, and then the next layer of soil is backfilled until the backfilling is finished.
5. The construction process of the compaction pile for improving the water stability according to claim 1, wherein the construction process comprises the following steps: the method specifically comprises the following steps:
a construction process of a compaction pile for improving water stability comprises the following steps:
step one, determining the engineering quantity
Determining ash according to the formulaThe engineering quantity of the soil compaction pile is 1.5m3；
Step two: drilling a pile hole according to the engineering quantity determined in the step one, and then preparing lime with the lime soil to be 0.3m3Clay of 1.2m3Uniformly mixing, and backfilling the compacted pile;
step three: configuring CaCl2Solutions of
0.12kg of CaCl2Adding into 3.6L water, heating to 65 deg.C to make its concentration reach 2.9%;
step four: backfilling
Bottom ramming is carried out before backfilling, then the pile holes are backfilled with the lime soil prepared in the step two, and each layer of the lime soil is 0.188m3Adding once CaCl2The solution is 0.465L, then the rammed soil is tamped, and the next layer of soil is backfilled until the backfilling is completed.
6. The construction process of the compaction pile for improving the water stability according to claim 1, wherein the construction process comprises the following steps: the method specifically comprises the following steps:
step one, determining the engineering quantity
According to a formula, determining the engineering quantity of the lime-soil compaction pile to be 2m3；
Step two: drilling a pile hole according to the engineering quantity determined in the step one, and then preparing lime with the lime soil to be 0.5m3Clay of 1.5m3Uniformly mixing, and backfilling the compacted pile;
step three: configuring CaCl2Solutions of
0.13kg of CaCl2Adding into 4.04L water, heating to 70 deg.C to make the concentration reach 3.0%;
step four: backfilling
Before backfilling, bottom ramming is firstly carried out, then the pile holes are backfilled with the lime soil prepared in the step two, and each layer of the lime soil is 0.25m3Adding once CaCl2The solution is 0.543L, then is tamped, and then the next layer of soil is backfilled until the backfilling is completed.
7. The construction process of the compaction pile for improving the water stability according to claim 1, wherein the construction process comprises the following steps: the method specifically comprises the following steps:
step one, determining the engineering quantity
According to a formula, determining the engineering quantity of the lime-soil compaction pile to be 3m3；
Step two: drilling a pile hole according to the engineering quantity determined in the step one, and then preparing lime with lime soil to prepare lime of 0.75m3Clay of 2.25m3Uniformly mixing, and backfilling the compacted pile;
step three: configuring CaCl2Solutions of
0.14kg of CaCl2Adding into 4.213L water, heating to 75 deg.C to reach concentration of 3.1%;
step four: backfilling
Before backfilling, bottom ramming is firstly carried out, then the pile holes are backfilled with the lime soil prepared in the step two, and each layer of the lime soil is 0.375m3Adding once CaCl2The solution is 0.544L, then is tamped, and the next layer of soil is backfilled until the backfilling is completed.
8. The construction process of the compaction pile for improving the water stability according to claim 1, wherein the construction process comprises the following steps: the method specifically comprises the following steps:
step one, determining the engineering quantity
Determining the engineering quantity of the lime-soil compaction pile to be 3.656m according to a formula3；
Step two: drilling a pile hole according to the engineering quantity determined in the step one, and then preparing the lime soil
Lime is prepared to be 0.914m3Clay of 2.742m3Uniformly mixing, and backfilling the compacted pile;
step three: configuring CaCl2Solutions of
0.15kg of CaCl2Adding into 4.538L water, and heating to 80 deg.C to reach concentration of 3.2%;
step four: before backfilling, bottom ramming is firstly carried out, then the pile holes are backfilled with the lime soil prepared in the step two, and each layer of the lime soil is 0.457m3Adding once CaCl2The solution was 0.586L,and then tamping, and backfilling the next layer of soil until all backfilling is finished.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006169940A (en) * | 2004-11-17 | 2006-06-29 | Hokkaido Univ | Soil improving method and grout used for soil improvement method |
| CN103193454A (en) * | 2013-02-04 | 2013-07-10 | 陕西煤业化工建设（集团）有限公司 | Grouting material applicable to reinforcement of sand layer and grouting method |
-
2020
- 2020-12-10 CN CN202011436082.6A patent/CN112627160A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006169940A (en) * | 2004-11-17 | 2006-06-29 | Hokkaido Univ | Soil improving method and grout used for soil improvement method |
| CN103193454A (en) * | 2013-02-04 | 2013-07-10 | 陕西煤业化工建设（集团）有限公司 | Grouting material applicable to reinforcement of sand layer and grouting method |
Non-Patent Citations (3)
| Title |
|---|
| 王华川等: "浅谈综合稳定土类材料", 《黑龙江交通科技》 * |
| 肖鹤松: "改性灰土强度的研究", 《湖南大学学报(自然科学版)》 * |
| 陈永志: "灰土挤密桩在公路路基基底处理中的应用", 《黑龙江科技信息》 * |
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