CN111663553B - Double-spiral extruded pile-seepage-proofing body combined foundation structure and design method - Google Patents

Double-spiral extruded pile-seepage-proofing body combined foundation structure and design method Download PDF

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CN111663553B
CN111663553B CN202010407468.8A CN202010407468A CN111663553B CN 111663553 B CN111663553 B CN 111663553B CN 202010407468 A CN202010407468 A CN 202010407468A CN 111663553 B CN111663553 B CN 111663553B
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雒亿平
李炎隆
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Xian University of Technology
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/10—Deep foundations
    • E02D27/12—Pile foundations
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D27/00—Foundations as substructures
    • E02D27/10—Deep foundations
    • E02D27/12—Pile foundations
    • E02D27/14—Pile framings, i.e. piles assembled to form the substructure
    • 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
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
    • E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/46—Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
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  • General Engineering & Computer Science (AREA)
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  • Agronomy & Crop Science (AREA)
  • Soil Sciences (AREA)
  • Foundations (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

The invention discloses a double-spiral extruded and expanded pile-seepage-proofing body combined foundation structure and a design method, wherein the double-spiral extruded and expanded pile-seepage-proofing body combined foundation structure comprises a horizontal seepage-proofing layer and a bearing platform arranged on the horizontal seepage-proofing layer, at least one part of the bearing platform leaks out of the ground, a double-spiral extruded and expanded pile is arranged at one end of the bearing platform towards the ground, at least one part of the double-spiral extruded and expanded pile extends out of the horizontal seepage-proofing layer towards the ground, and a stirring wall is arranged on the side surface of the horizontal seepage-proofing layer towards the ground; the design method specifically comprises the following steps: step 1: determining the size of the double-helix extruded pile; step 2: determining the thickness H of the horizontal impermeable layer; and step 3: the dimensions of the mixing wall are determined. The construction process is convenient, the structure is reliable in waterproof and drainage effect, high in safety and reliability and low in manufacturing cost, and the structure is suitable for transformer substations and related shallow foundation projects which are built in level III and above collapsible loess areas and have small building and structure loads.

Description

Double-spiral extruded pile-seepage-proofing body combined foundation structure and design method
Technical Field
The invention belongs to the technical field of large-thickness collapsible loess building foundations, and particularly relates to a double-spiral extruded pile-seepage-proof body combined foundation structure and a design method.
Background
The safe use of buildings is always influenced by the foundation treatment and the foundation design of the large-thickness collapsible loess area. At present, in the shallow foundation design, the conventional foundation design of the loess area with large thickness is generally to firstly process the collapsibility of the foundation and then carry out the conventional shallow foundation design on the foundation; when deep foundations are used, the foundation bearing layer is generally required to penetrate the collapsible loess layer due to the influence of the collapsible loess. However, in the large-thickness collapsible loess area, the conventional foundation treatment method is as follows: the dynamic compaction, pile compaction and pre-soaking have the advantages that the construction requirement is high, the process is complex, the safety and reliability of the foundation cannot be guaranteed, and the foundation treatment cost is high; when a deep foundation (pile foundation) is adopted, as the depth of the large-thickness collapsible loess exceeds 50 meters at all times and even exceeds hundreds of meters in partial areas, the design and construction difficulty of the foundation is increased due to the collapsible loess when the deep foundation is adopted, and the manufacturing cost is greatly improved. In conclusion, the existing foundation design of the large-thickness loess area has the problems of complex construction process, higher cost and low safety factor.
Disclosure of Invention
The invention aims to provide a double-spiral extruded and expanded pile-seepage-proofing body combined foundation structure and a design method thereof, and solves the problems of complex construction process, higher cost and insufficient safety factor existing in the current foundation design of a large-thickness loess area.
The technical scheme adopted by the invention is that,
a double-helix extruding-expanding pile-seepage-proofing body combined foundation structure and a design method thereof comprise a horizontal seepage-proofing layer and a bearing platform arranged on the horizontal seepage-proofing layer, wherein at least one part of the bearing platform leaks out of the ground;
the method specifically comprises the following steps:
step 1: determining a standard value of the ultimate bearing capacity of the double-helix extruded and expanded pile according to a static sounding method, and then determining the size of the double-helix extruded and expanded pile;
step 2: determining the thickness H of the horizontal impermeable layer according to the size of the double-spiral extruded and expanded pile obtained in the step 1, wherein the value of the thickness H is 1.0-1.5 times of the diameter of the double-spiral extruded and expanded pile;
and step 3: the stirring wall is accomplished by the overlap joint of stirring stake, and the aperture of stirring stake is according to the voltage value of transformer substation, and the length of stirring stake is according to the surplus collapsible volume value of collapsible loess.
The present invention is also characterized in that,
in the step 1, the size comprises the diameter and the length of the double-helix extrusion pile.
In the step 1, the diameter of the double-helix extrusion pile ranges from 40cm to 80 cm.
In step 1, the static sounding method specifically comprises the following formula (1):
Figure BDA0002491913180000021
wherein Q isukIs a standard value of ultimate bearing capacity, QskIs a standard value of the total limit side resistance of the single pile, QpkIs the standard value of the resistance of the total limit end of the single pile, u is the circumference of the pile body, liThickness of the i-th layer of soil around the pile, fsiAverage lateral resistance of probe, q, for the i-th layer of soilcTaking the weighted average of the upper and lower probe resistances of the pile end plane according to the soil layer thickness within the range of four times the pile diameter on the pile end plane, and then averaging the weighted average with the probe resistance within the range of one time the pile diameter below the pile end plane, ApIs a pile end;
in step 3, the aperture of the mixing pile is specifically selected according to the voltage value of the transformer substation as follows: the diameter of the mixing pile is 0.5m when the diameter of the mixing pile is in a transformer substation with a voltage class of 110kV or below, and the diameter of the mixing pile is 0.6m when the diameter of the mixing pile is in a transformer substation with a voltage class of more than 110 kV.
In step 3, the length of the mixing pile is measured according to the remaining collapsible amount of the collapsible loess and is specifically as follows: the residual collapse amount is not more than 150mm, under the control of the residual collapse amount, the maximum pile length of the stirring pile is 20m for a transformer substation with a voltage class of 110kV or below, the maximum pile length of the transformer substation with a voltage class of more than 110kV is 25m, and the lap joint length of the stirring pile is more than 200 mm.
The invention has the beneficial effects that:
according to the double-spiral extruded and expanded pile-seepage-proofing body combined foundation structure and the design method, the stirring pile wall-forming seepage-proofing technology is widely applied to projects such as water conservancy projects and foundation pit protection, and the water-proofing effect is good. The bedding treatment also finds good application in the design of horizontal impermeable bodies. The double-helix anchor pile extrudes all soil in the pile hole into the soil around the pile hole, and performs center pressure grouting of fluid concrete to the pile hole formed by extrusion expansion to form a cylindrical pile body, so that a good compaction effect is achieved on collapsible loess through extrusion, and the design of a friction pile is facilitated; the structure of the invention prevents the influence of water on the foundation by a method combining vertical seepage prevention and horizontal seepage prevention, and simultaneously improves the reliability of the design of the friction type pile by the compaction of the double-helix extrusion-expansion pile.
The structure has the advantages of reliable waterproof and drainage effects, mature construction process, high safety and reliability, low manufacturing cost and the like, and is suitable for transformer substations and related shallow foundation projects which are built in level III and above collapsible loess areas and have small building and structure loads.
Drawings
FIG. 1 is a schematic front view of a double-helix extruded and expanded pile-impermeable body combined foundation structure and a design method of the structure;
FIG. 2 is a schematic top view of a mixing wall in a double-helix extruded and expanded pile-penetration-preventing body combined foundation structure and a design method according to the invention;
in the figure, 1, a bearing platform, 2, a horizontal impermeable layer, 3, a double-helix extrusion-expansion pile and 4, a stirring wall.
Detailed Description
The double-spiral extruded and expanded pile-impermeable body combined foundation structure and the design method thereof are described in detail with reference to the accompanying drawings and the specific embodiments.
As shown in fig. 1 and 2, a double-spiral extruded pile-impermeable body combined foundation structure and a design method thereof comprise a horizontal impermeable layer 2 and a bearing platform 1 arranged on the horizontal impermeable layer 2, wherein at least one part of the bearing platform 1 leaks out of the ground, one end of the bearing platform 1 towards the ground is provided with a double-spiral extruded pile 3, at least one part of the double-spiral extruded pile 3 extends out of the horizontal impermeable layer 2 towards the ground, and the side surface of the horizontal impermeable layer 2 towards the ground is provided with a stirring wall 4;
the method specifically comprises the following steps:
step 1: determining a standard value of the ultimate bearing capacity of the double-helix extruded and expanded pile according to a static sounding method, and then determining the size of the double-helix extruded and expanded pile;
step 2: determining the thickness H of the horizontal impermeable layer according to the size of the double-spiral extruded and expanded pile obtained in the step 1, wherein the value of the thickness H is 1.0-1.5 times of the diameter of the double-spiral extruded and expanded pile;
and step 3: the stirring wall is accomplished by the overlap joint of stirring stake, and the aperture of stirring stake is according to the voltage value of transformer substation, and the length of stirring stake is according to the surplus collapsible volume value of collapsible loess.
The invention relates to a double-helix extrusion-expansion pile-seepage-proofing body combined foundation structure and a design method, wherein a double-helix extrusion-expansion pile 3 is mainly used for sealing the surrounding soil body and improving the shearing resistance and the dynamic load capacity of the pile body, and the collapsibility of the soil body in the diameter range of 3.0-4.0 times can be eliminated through the compaction of the surrounding soil body, the frictional resistance of the pile can be improved, and the negative frictional resistance caused by the collapsibility around the pile body can be eliminated.
The invention relates to a double-helix extrusion-expansion pile-seepage-proofing body combined foundation structure and a design method thereof.A horizontal seepage-proofing layer 2 is mainly used for seepage proofing and horizontally and vertically penetrating into a foundation and mainly eliminates the influence of a double-helix anchor pile on the seepage-proofing effect of a surface soil body in the extrusion-expansion process.
According to the double-spiral extruded and expanded pile-seepage-proof body combined foundation structure and the design method, the stirring wall 4 is mainly used for preventing the influence of horizontal infiltration of water on a foundation, and meanwhile, the stirring wall 4 can improve the bearing capacity and can be used as the foundation of a transformer substation enclosure wall.
Further, in step 1, the size includes the diameter and length of the double-helix extrusion pile.
Further, in the step 1, the diameter of the double-spiral extruding and expanding pile ranges from 40cm to 80 cm.
Further, in step 1, the static sounding method specifically includes formula (1):
Figure BDA0002491913180000051
wherein Q isukIs a standard value of ultimate bearing capacity, QskIs a standard value of the total limit side resistance of the single pile, QpkIs the standard value of the resistance of the total limit end of the single pile, u is the circumference of the pile body, liThickness of the i-th layer of soil around the pile, fsiAverage lateral resistance of probe, q, for the i-th layer of soilcTaking the weighted average of the upper and lower probe resistances of the pile end plane according to the soil layer thickness within the range of four times the pile diameter on the pile end plane, and then averaging the weighted average with the probe resistance within the range of one time the pile diameter below the pile end plane, ApIs a pile end;
further, in step 3, the aperture of the mixing pile is specifically as follows according to the voltage value of the transformer substation: the diameter of the mixing pile is 0.5m when the diameter of the mixing pile is in a transformer substation with a voltage class of 110kV or below, and the diameter of the mixing pile is 0.6m when the diameter of the mixing pile is in a transformer substation with a voltage class of more than 110 kV.
Further, in step 3, the length of the mixing pile is measured according to the remaining collapsible amount of the collapsible loess as follows: the residual collapse amount is not more than 150mm, under the control of the residual collapse amount, the maximum pile length of the stirring pile is 20m for a transformer substation with a voltage class of 110kV or below, the maximum pile length of the transformer substation with a voltage class of more than 110kV is 25m, and the lap joint length of the stirring pile is more than 200 mm.
The calculated value Δ S of the remaining amount of wet trap should be calculated as the following formula (2):
Figure BDA0002491913180000052
δsiis the coefficient of collapsibility, h, of the i-th layer of soiliThe thickness (mm) of the ith layer of soil, and beta is a correction coefficient;
the correction coefficient beta is defined as follows:
taking beta to be 1.50 within 0-5 m of depth below the substrate; taking beta as 1 within 5-10 m of depth below the substrate; and (3) taking the beta value of the area where the engineering is located in the self-weight collapsible loess field from the position below 10m below the base to the top surface of the non-collapsible loess layer.
The double-helix extruded pile-seepage-proofing body combined foundation structure and the design method have the characteristics of reliable waterproof and drainage effects, mature construction process, high safety and reliability, low manufacturing cost and the like, and the structure is suitable for being built in transformer substations and related shallow foundation projects in level III and above collapsible loess areas with small building and structure loads.

Claims (6)

1. A double-helix extruding-expanding pile-impermeable body combined foundation structure is characterized by comprising a horizontal impermeable layer (2) and a bearing platform (1) arranged on the horizontal impermeable layer (2), wherein at least one part of the bearing platform (1) leaks out of the ground, a double-helix extruding-expanding pile (3) is arranged at one end, facing the underground, of the bearing platform (1), and a stirring wall (4) is arranged on the side face, extending out of the horizontal impermeable layer (2) towards the underground, of at least one part of the double-helix extruding-expanding pile (3);
the design method of the double-helix extruded and expanded pile-impermeable body combined foundation structure specifically comprises the following steps:
step 1: determining a standard value of the ultimate bearing capacity of the double-helix extruded and expanded pile according to a static sounding method, and then determining the size of the double-helix extruded and expanded pile;
step 2: determining the thickness H of the horizontal impermeable layer according to the size of the double-spiral extruded and expanded pile obtained in the step 1, wherein the value of the thickness H is 1.0-1.5 times of the diameter of the double-spiral extruded and expanded pile;
and step 3: the stirring wall is formed by overlapping stirring piles, the aperture of each stirring pile is selected according to the voltage of a transformer substation, and the length of each stirring pile is selected according to the residual collapsible amount of the collapsible loess;
the calculated value Δ S of the remaining amount of wet trap should be calculated according to the following formula (2):
Figure FDA0003236364450000011
in the formula (2), δsiIs the coefficient of collapsibility, h, of the i-th layer of soiliThe thickness (mm) of the ith layer of soil, and beta is a correction coefficient;
the correction coefficient beta is defined as follows:
taking beta to be 1.50 within 0-5 m of depth below the substrate; taking beta as 1 within 5-10 m of depth below the substrate; and (3) taking the beta value of the area where the engineering is located in the self-weight collapsible loess field from the position below 10m below the base to the top surface of the non-collapsible loess layer.
2. The double helical reamed pile-penetration preventer composite foundation structure according to claim 1, wherein the dimensions comprise a diameter and a length of the double helical reamed pile.
3. The double-spiral extruded and expanded pile-seepage-proofing body combined foundation structure according to claim 1, wherein in the step 1, the diameter of the double-spiral extruded and expanded pile ranges from 40cm to 80 cm.
4. The double-helix extrusion pile-seepage-proofing body combined foundation structure according to claim 3, wherein in the step 1, the static sounding method specifically comprises a formula (1):
Figure FDA0003236364450000021
wherein Q isukIs a standard value of ultimate bearing capacity, QskIs a standard value of the total limit side resistance of the single pile, QpkIs the standard value of the resistance of the total limit end of the single pile, u is the circumference of the pile body, liThickness of the i-th layer of soil around the pile, fsiAverage lateral resistance of probe, q, for the i-th layer of soilcTaking the weighted average of the upper and lower probe resistances of the pile end plane according to the soil layer thickness within the range of four times the pile diameter on the pile end plane, and then averaging the weighted average with the probe resistance within the range of one time the pile diameter below the pile end plane, ApIs a pile tip.
5. The double-helix extrusion-expansion pile-seepage-proofing body combined foundation structure according to claim 1, wherein in the step 3, the aperture of the stirring pile is specifically as follows according to the voltage value of a transformer substation: the diameter of the mixing pile is 0.5m when the diameter of the mixing pile is in a transformer substation with a voltage class of 110kV or below, and the diameter of the mixing pile is 0.6m when the diameter of the mixing pile is in a transformer substation with a voltage class of more than 110 kV.
6. The double-helix extrusion-expansion pile-seepage-proofing body combined foundation structure according to claim 5, wherein in the step 3, the length of the mixing pile is measured according to the residual collapsible amount of the collapsible loess as follows: the residual collapse amount is not more than 150mm, under the control of the residual collapse amount, the maximum pile length of the stirring pile is 20m for a transformer substation with a voltage class of 110kV or below, the maximum pile length of the transformer substation with a voltage class of more than 110kV is 25m, and the lap joint length of the stirring pile is more than 200 mm.
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CN205134349U (en) * 2015-10-26 2016-04-06 江苏嘉泽建设有限公司 Building pile foundation
CN106906836A (en) * 2017-03-03 2017-06-30 苏州中材建设有限公司 A kind of CFG pile composite foundations and its construction method for ferruginous laterite area
CN107761708A (en) * 2017-09-18 2018-03-06 庆阳敦博科技发展有限公司 The processing method that big thickness Collapsible Loess District Subway station groundwork is reinforced
CN109680701A (en) * 2019-02-01 2019-04-26 长江勘测规划设计研究有限责任公司 One kind is for pile foundation construction leakage preventing structure and construction method on dyke

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