CN110284497B - Foundation reinforcing method for controlling deformation of existing tunnel structure under soft soil foundation pit - Google Patents

Foundation reinforcing method for controlling deformation of existing tunnel structure under soft soil foundation pit Download PDF

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Publication number
CN110284497B
CN110284497B CN201910553513.8A CN201910553513A CN110284497B CN 110284497 B CN110284497 B CN 110284497B CN 201910553513 A CN201910553513 A CN 201910553513A CN 110284497 B CN110284497 B CN 110284497B
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diameter
pile
reinforcing
tunnel
underground
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CN110284497A (en
Inventor
童立元
王占生
叶海霞
庄群虎
刘建国
胡诗韬
陈秀鸣
潘皇宋
杨涛
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Southeast University
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Southeast University
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D15/00Handling building or like materials for hydraulic engineering or foundations
    • E02D15/02Handling of bulk concrete specially for foundation or hydraulic engineering purposes
    • E02D15/04Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02DFOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22Piles
    • E02D5/34Concrete or concrete-like piles cast in position ; Apparatus for making same
    • E02D5/46Concrete or concrete-like piles cast in position ; Apparatus for making same making in situ by forcing bonding agents into gravel fillings or the soil

Abstract

The invention discloses a foundation reinforcing method for controlling deformation of an existing tunnel structure under a soft soil foundation pit, which is characterized in that variable-depth, variable-ash-doping-amount and variable-diameter cement mixing piles are adopted at two sides, the middle part and the upper part of the existing tunnel structure to reinforce the foundation, a single-layer or multi-layer plate-shaped cement reinforcing layer is formed at the position below a newly-built underground structure bottom plate by enlarging the diameter of a reinforcing body, and an integral door frame type protective structure is formed by effectively connecting uplift piles, the newly-built underground structure bottom plate and the plate-shaped cement reinforcing layer to protect the existing tunnel structure under the newly-built underground structure, so that the influence of construction disturbance of the upper underground structure on the existing tunnel structure under the newly-built underground structure can be greatly reduced, and the safe operation of the.

Description

Foundation reinforcing method for controlling deformation of existing tunnel structure under soft soil foundation pit
Technical Field
The invention belongs to the technical field of civil construction traffic, and particularly relates to a foundation reinforcing method for controlling deformation of an existing tunnel structure under a soft soil foundation pit.
Background
With the large-scale development of urban underground spaces, new and old underground engineering structures built at different depth levels, different spatial position relations and different development periods have mutual influence, wherein the influence of the newly-built underground engineering (such as municipal road tunnels, underground comprehensive pipe galleries and the like) open-cut deep foundation pits on the underlying existing tunnel structure is a typical working condition. The existing treatment method includes forming protection walls (frames) at both sides and upper portion of the existing tunnel structure using cast-in-place piles or sheet piles to protect the existing underground structure, meanwhile, the full foundation reinforcement treatment is carried out above the existing tunnel, the construction cost of the former is huge, the construction unloading disturbance of the latter has great influence on engineering structures such as the underground tunnel and the like, and the existing case shows that the subway tunnel deformation caused by the construction disturbance in the foundation reinforcement stage carried out above the existing tunnel reaches more than 50 percent of the total uplift deformation and even exceeds the uplift deformation caused in the later excavation stage, therefore, a foundation reinforcing method for controlling the bulging deformation of the existing underground engineering structure under the soft soil foundation pit is urgently needed to replace the existing foundation treatment mode of full reinforcement, the construction disturbance in the foundation stabilization stage is reduced, and the effect of controlling the deformation of the underlying underground structure caused by unloading and uplifting of the subsequently excavated foundation is achieved.
Disclosure of Invention
In order to solve the problems, the invention discloses a foundation reinforcing method for controlling the deformation of the existing tunnel structure under the soft soil foundation pit, which can greatly reduce the influence of foundation reinforcing construction on the existing tunnel under the soft soil foundation pit during the construction of the upper underground structure and ensure the operation safety of the existing tunnel under the soft soil foundation pit.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a foundation reinforcing method for controlling the deformation of an existing tunnel structure under a soft soil foundation pit comprises the following steps:
(1) calculating and determining a foundation reinforcement range and reinforcement design parameters according to the deformation control requirement of the existing tunnel structure;
(2) firstly, reinforcing construction of cement-soil mixing piles at the outer sides of two sides of an existing tunnel structure is completed; secondly, completing the reinforcing construction of the cement-soil mixing piles at the middle parts of the two tunnels; finally, reinforcing construction is carried out on the cement-soil mixing pile at the upper part of the existing tunnel structure;
(3) completing the construction of the uplift pile of the newly-built underground structure, and performing pile side post-grouting at the position below the bottom plate of the newly-built underground structure;
(4) completing the construction of a foundation pit support structure, excavating to a designed depth, pouring a concrete bottom plate, and connecting with the uplift pile;
(5) completing the construction of side walls and top plates of newly-built underground structures; and backfilling soil, recovering the pavement and finishing construction.
Preferably, in the step (1), the influence of the construction of the newly-built underground structure under different foundation reinforcing schemes on the underlying tunnel structure is analyzed by adopting a finite element numerical calculation method, and the design parameters of foundation reinforcement are determined according to the influence, wherein the design parameters comprise the reinforcement range, the reinforcement depth of different parts, the pile spacing of the cement-soil mixing piles and the diameter-changing parameters (diameter-changing position and reinforcement body diameter-enlarging height) of the cement-soil piles.
Preferably, in the step (2), the cement-soil mixing piles at the outer sides of the two sides and the middle part of the existing tunnel structure under the tunnel structure are reinforced to a depth of not less than 5m below the bottom of the existing tunnel structure under the tunnel structure; the reinforcing depth of the cement-soil mixing pile at the upper part of the existing tunnel structure is controlled to be not less than 1m from the top of the tunnel structure.
Preferably, in the step (2), the ash (cement) doping amount of the cement soil mixing piles at different depths is controlled, a low-ash-doping-amount reinforcing section is arranged from the ground surface to the top plate of the newly-built underground structure, and the ash doping amount is preferably controlled to be 5%; a middle ash mixing amount reinforcing section is arranged between the top plate and the bottom plate of the newly-built underground structure, and the ash mixing amount is preferably controlled to be 10-15%; a high-ash-mixing-amount reinforcing section is arranged below a newly-built underground structure bottom plate, and the ash mixing amount is preferably controlled to be 25-40%.
Preferably, in the step (2), the diameter-enlarged section of the cement mixing pile reinforcement body below the bottom plate of the newly-built underground structure is overlapped according to a certain size (250 mm) to form a plate-shaped reinforcement layer with a certain thickness.
Preferably, in the step (3), after the uplift pile is constructed, the uplift pile is subjected to post-grouting on the pile side penetrating through the cement-soil plate-shaped reinforcing layer, and is effectively connected with the plate-shaped reinforcing layer and the newly-built underground structure concrete bottom plate to form an integral door frame type reinforcing structure, so that the underlying existing tunnel structure in the integral door frame type reinforcing structure is protected.
A foundation reinforcing method for controlling the deformation of the existing tunnel structure under a soft soil foundation pit is disclosed, wherein the foundation reinforcing structure comprises a newly built underground structure; an underlying existing tunnel structure; an original formation; newly building uplift piles of the underground structure; mixing the cement soil with the pile; the stirring pile is low in ash content; segment with medium ash mixing amount in the stirring pile; the stirring pile is high in ash mixing amount and variable-diameter sections; the variable diameter section has multiple variable diameter modes; reinforcing areas on two sides of the existing underground tunnel structure; the middle reinforcing area of the existing underground tunnel structure; a reinforcement area above the existing underground tunnel structure; the variable diameter sections are overlapped to form a plate-shaped reinforcing layer.
Preferably, the newly-built underground structure is located existing tunnel structure top down, can be quadrature or the skew on the two plane, and newly-built underground structure can be urban town road tunnel, subway tunnel, utility tunnel, humanoid street crossing passageway or other underground structure thing, and existing tunnel structure can be structures such as town road tunnel, subway tunnel or utility tunnel.
Preferably, the high ash content and diameter-variable section III below the bottom plate of the newly-built underground structure can form a reinforced body direct-expansion section at different positions by adopting different diameter-variable modes, wherein the reinforced body direct-expansion section comprises an upper diameter-variable section, a middle diameter-variable section, a lower diameter-variable section or an upper, middle and lower diameter-variable combination.
Preferably, the diameter-variable section III can be a column-type diameter-expansion section or a sawtooth-type diameter-expansion section or other possible pile diameter-expansion modes (including a threaded type, a screw type, a spherical type and the like) implemented by different construction machines.
Preferably, the uplift pile is mutually connected with a newly-built underground structure bottom plate and a plate-shaped reinforcing layer to form an integral door frame type protective structure.
The invention has the beneficial effects that:
the invention adopts the variable depth, variable ash content and variable diameter cement mixing piles to reinforce the foundation on two sides, the middle part and the upper part of the existing tunnel structure, forms a single-layer or multi-layer plate-shaped cement reinforcing layer by enlarging the diameter of a reinforcing body at the position below the bottom plate of the newly-built underground structure, and forms an integral door frame type protective structure by effectively connecting the uplift pile, the concrete bottom plate of the newly-built underground structure and the plate-shaped cement reinforcing layer to protect the existing tunnel structure therein, thereby greatly reducing the influence of the construction of the upper underground structure on the lower existing tunnel structure and ensuring the safe operation of the existing tunnel structure.
Drawings
Fig. 1 is a schematic view of the position structure of the present invention.
Fig. 2 is a schematic diagram of different structures of the cement-soil mixing pile of the invention.
FIG. 3 is a schematic view showing the reinforcement range of the soil-cement mixing pile at different positions according to the present invention.
FIG. 4 is a schematic diagram of a plate-shaped reinforcing layer formed by reducing and overlapping the cement mixing pile according to the present invention.
FIG. 5 is a schematic diagram of a planar lapping method for the variable diameter mixing pile.
1, newly building an underground structure; 2. an underlying existing tunnel structure; 3. an original formation; 4. uplift piles; 5. mixing the cement soil with the pile; 6. the stirring pile is low in ash mixing amount and is a segment I; 7. segment II with the middle ash mixing amount in the stirring pile; 8. the stirring pile is high in ash mixing amount and a diameter-variable section III; 9. the variable diameter section has multiple variable diameter modes; 10. reinforcing areas on two sides of the existing underground tunnel structure; 11. the middle reinforcing area of the existing underground tunnel structure; 12. a reinforcement area above the existing underground tunnel structure; 13. a plate-shaped reinforcing layer.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
As shown in fig. 1, a method for reinforcing a foundation to control deformation of an existing tunnel structure under a soft soil foundation pit includes: newly building an underground structure 1; an underlying existing tunnel structure 2; a virgin formation 3; newly building an uplift pile 4 of the underground structure; a cement soil mixing pile 5; the stirring pile low-ash-mixing-amount segment 6; segment 7 with medium ash content in the stirring pile; the stirring pile is high in ash mixing amount and the reducing segment 8; the variable diameter section has multiple variable diameter modes 9; reinforcing areas 10 on two sides of the existing underground tunnel structure; the middle reinforcing area 11 of the existing underground tunnel structure; a reinforcement area 12 above the existing underground tunnel structure; the reducing sections are overlapped to form a plate-shaped reinforcing layer 13.
A foundation reinforcing method for controlling the deformation of the existing tunnel structure under a soft soil foundation pit specifically comprises the following steps:
(1) carrying out finite element numerical simulation analysis according to the deformation control requirement of the existing tunnel structure 2, analyzing and comparing the deformation of the existing tunnel structure 2 caused by the construction of the newly-built upper underground structure 1 under different foundation reinforcement schemes, selecting a foundation reinforcement design scheme according to the analysis, and determining a foundation reinforcement range and reinforcement design parameters;
(2) according to the design scheme of foundation reinforcement, carrying out partition reinforcement construction: firstly, carrying out reinforcing construction on the cement soil mixing piles 10 at the outer sides of two sides of the existing tunnel structure 2; secondly, carrying out two cement soil mixing piles reinforcing constructions for the middle part 11 of the existing tunnel structure 2; and finally, carrying out the reinforcing construction of the 12 cement soil mixing piles at the upper part of the existing tunnel structure 2. When the cement-soil mixing pile below the bottom plate of the newly-built underground structure 1 is constructed, expanding the diameter at different depths to enable the mixing pile to be lapped to form a single-layer or multi-layer plate-shaped reinforcing layer 13;
(3) constructing an uplift pile 4 of a newly-built underground structure, performing pile side post-grouting at the position below a bottom plate of the newly-built underground structure 1, and connecting the uplift pile 4 with a single-layer or multi-layer plate-shaped reinforcing layer 13 to form a first-channel integral door frame type protective structure;
(4) carrying out open cut foundation pit support structure construction, excavating a foundation pit to a designed depth, pouring an underground structure bottom plate and connecting the underground structure bottom plate with the uplift pile 4 to form a secondary protection structure;
(5) continuously constructing and newly building the side wall and the top plate of the underground structure 1; and (5) backfilling soil, recovering the pavement and finishing construction.
In the step (1), finite element numerical simulation analysis is carried out on different foundation reinforcing schemes to obtain deformation numerical values of the underlying tunnel structure caused by newly-built underground structure construction under different reinforcing conditions, and then the foundation reinforcing scheme and reinforcing design parameters thereof are selected according to the deformation control standard requirements, wherein the parameters comprise the plane range of foundation reinforcement, the reinforcing depths of different parts, the pile spacing of cement mixing piles and cement soil pile diameter-changing parameters (the diameter-enlarging position, the diameter-enlarging position and the height-enlarging height of a reinforcing body).
In the step (2), the reinforcing depth of the stirring piles at two sides and the middle part of the existing tunnel structure 2 under the tunnel structure is more than 5m below the bottom plate of the existing tunnel structure 2 under the tunnel structure; the reinforcement depth of the mixing pile above the underlying existing tunnel structure 2 should be no less than 1m above the top plate of the underlying existing tunnel structure 2.
In the step (2), the ash content of the cement soil mixing piles 5 is changed from top to bottom, the section I6 with low ash content is arranged above the top plate of the newly-built underground structure 1, and the ash content is not more than 5%; a second section 7 with medium ash mixing amount is arranged between the top and bottom plates of the newly-built underground structure, and the ash mixing amount is preferably controlled to be 10-15%; and a third section 8 with high ash content is arranged below the bottom plate of the newly-built underground structure, and the ash content is preferably controlled to be 25-40% according to the soft soil characteristic.
In the step (2), the directly enlarged sections of the cement mixing pile reinforcing body below the bottom plate of the newly-built underground structure 1 are lapped with a certain size (generally 250 mm), and a plate-shaped horizontal reinforcing layer 13 is formed.
In the step (3), the uplift pile 4 is connected with the plate-shaped horizontal reinforcing layer 13 and the bottom plate of the newly-built underground structure 1 to form an integral door frame type reinforcing structure.
The invention adopts the variable depth, variable ash content and variable diameter cement mixing piles to reinforce the foundation on two sides of the existing tunnel structure, the middle part and the upper part of two tunnels, forms a single-layer or multi-layer plate-shaped cement reinforcing layer by enlarging the diameter of a reinforcing body at the position below the bottom plate of the newly-built underground structure, and forms an integral door frame type protective structure by effectively connecting the uplift pile, the concrete bottom plate of the newly-built underground structure and the plate-shaped cement reinforcing layer to protect the underlying existing tunnel structure, thereby greatly reducing the influence of the construction of the upper underground structure on the underlying existing tunnel structure and ensuring the safe operation of the underlying existing tunnel structure.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.

Claims (5)

1. A foundation reinforcing method for controlling the deformation of an existing tunnel structure under a soft soil foundation pit is characterized by comprising the following steps:
(1) comparing different foundation reinforcement schemes by adopting a finite element numerical simulation analysis method according to the deformation control standard of the existing tunnel structure to determine the foundation reinforcement range and reinforcement design parameters; the design parameters of foundation reinforcement specifically comprise a plane reinforcement range, reinforcement depths of different parts, the pile spacing of cement-soil mixing piles, diameter-changing parameters of cement-soil piles, a reinforcement diameter expansion position, an expanded diameter and an expanded height;
(2) firstly, reinforcing construction of cement-soil mixing piles at two side parts of the existing tunnel is completed, and secondly, reinforcing construction of cement-soil mixing piles at the middle part is completed; finally, completing the reinforcing construction of the cement-soil mixing pile at the upper part of the existing tunnel; completing the diameter-changing construction of the cement-soil mixing pile according to the design requirement at the depth below a bottom plate of a newly-built underground structure, and forming a complete plate-shaped reinforcing layer by overlapping of expansion sections;
(3) completing uplift pile construction, and carrying out pile side rear grouting;
(4) completing the construction of a foundation pit support structure, excavating to a designed depth, pouring a concrete bottom plate, and connecting with the uplift pile;
(5) completing the construction of side walls and top plates of newly-built underground structures; backfilling soil, recovering the pavement and completing construction;
the reinforcement structure of the foundation includes:
newly building an underground structure (1); an underlying existing tunnel structure (2); a virgin formation (3); newly building an uplift pile (4) of the underground structure; a cement soil mixing pile (5); a low-ash-mixing-amount section (6) of the stirring pile; a section (7) with medium ash mixing amount in the mixing pile; the stirring pile is high in ash mixing amount and variable-diameter sections (8); the variable diameter section has a plurality of variable diameter modes (9); reinforcing areas (10) on two sides of the existing underground tunnel structure; an existing underground tunnel structure middle reinforcing area (11); a reinforcement zone (12) above the existing underground tunnel structure; a plate-shaped reinforcing layer (13) formed by overlapping the variable-diameter sections;
the newly-built underground structure (1) is orthogonal or oblique to the plane of the underlying existing tunnel structure (2), the newly-built underground structure (1) comprises a city municipal road tunnel, a subway tunnel, a comprehensive pipe gallery, a pedestrian street crossing channel or other underground structures, and the underlying existing tunnel structure (2) comprises the municipal road tunnel, the subway tunnel, the comprehensive pipe gallery or other underground structures;
two sides, the middle part and the upper part of the existing tunnel structure (2) are reinforced by adopting cement soil mixing piles (5); reinforcing depths of reinforcing areas (10) at two sides and a reinforcing area (11) of the underlying existing tunnel structure (2) are not less than 5m below the bottom of the underlying existing tunnel structure (2); the reinforcement region (12) above the underlying existing tunnel structure is no less than 1m deep from the top of the underlying existing tunnel structure (2).
2. The foundation stabilization method for controlling the deformation of the existing tunnel structure under the soft soil foundation pit according to claim 1, characterized in that the ash content of the cement-soil mixing piles (5) is adjusted in sections from the surface of the earth down: the position from the ground surface to the top plate of the newly-built underground structure (1) is a low-ash-doping-amount section (6), and the ash doping amount is 5 percent; sections (7) with medium ash content are arranged between the top and the bottom of the newly-built underground structure (1), and the ash content is 10-15%; the high ash content and the diameter-variable segment (8) are arranged below the bottom plate of the newly-built underground structure (1), and the ash content is 25-40%.
3. The foundation stabilization method for controlling deformation of an existing tunnel structure underlying a soft soil foundation pit according to claim 1, characterized in that a cement-soil mixing pile diameter-changing section (9) is arranged below the bottom plate of a newly-built underground structure (1), the pile diameter is enlarged at different depth positions according to the deformation control requirement of the existing tunnel structure (2) underlying, and a single-layer or multi-layer plate-shaped reinforcement layer (13) is formed by overlapping adjacent pile diameter-enlarging sections.
4. The method for reinforcing the foundation for controlling the deformation of the existing tunnel structure under the soft soil foundation pit according to claim 1, wherein the cement-soil mixing pile height ash mixing amount and the diameter-variable segments (8) form reinforced body diameter-enlarged segments at different positions by adopting different diameter-variable modes, wherein the reinforced body diameter-enlarged segments comprise an upper diameter-variable combination, a middle diameter-variable combination, a lower diameter-variable combination or an upper, middle and lower diameter-variable combination; the cement soil mixing pile high ash content and the reducing section (8) adopt different construction machinery to construct a column type diameter expanding section or a sawtooth type diameter expanding section or a thread type, screw type and spherical pile diameter expanding mode.
5. A foundation reinforcing method for controlling the deformation of the existing tunnel structure under the soft soil foundation pit according to claim 3, characterized in that the connection part of the uplift pile (4) and the single-layer or multi-layer plate-shaped reinforcing layer (13) is grouted at the back of the pile side to ensure that the uplift pile (4) is effectively connected with the bottom plate and the plate-shaped reinforcing layer (13) of the newly-built underground structure (1) to form an integral door frame type protective structure.
CN201910553513.8A 2019-06-25 2019-06-25 Foundation reinforcing method for controlling deformation of existing tunnel structure under soft soil foundation pit Active CN110284497B (en)

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