CN111222275A - Method for establishing segment ring floating and dislocation fine model separated from shield tail - Google Patents
Method for establishing segment ring floating and dislocation fine model separated from shield tail Download PDFInfo
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- CN111222275A CN111222275A CN202010015761.XA CN202010015761A CN111222275A CN 111222275 A CN111222275 A CN 111222275A CN 202010015761 A CN202010015761 A CN 202010015761A CN 111222275 A CN111222275 A CN 111222275A
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- 238000007667 floating Methods 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000010008 shearing Methods 0.000 claims abstract description 30
- 238000010276 construction Methods 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 10
- 230000005641 tunneling Effects 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 4
- 238000007569 slipcasting Methods 0.000 claims 1
- 238000006073 displacement reaction Methods 0.000 abstract description 8
- 238000005452 bending Methods 0.000 abstract description 2
- 238000004886 process control Methods 0.000 abstract description 2
- 239000002002 slurry Substances 0.000 description 12
- 230000009471 action Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011835 investigation Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 210000003205 muscle Anatomy 0.000 description 1
- 230000008520 organization Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000009958 sewing Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/08—Lining with building materials with preformed concrete slabs
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
- E21D9/0607—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining the shield being provided with devices for lining the tunnel, e.g. shuttering
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- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention relates to a method for establishing a segment ring floating and slab staggering fine model separated from a shield tail. The invention utilizes the self-made buoyancy test device to accurately test the buoyancy borne by the duct piece, and can better reflect the upward floating condition of the duct piece in the condition of grouting and wrapping behind the wall. The change of the attitude of the shield tunneling machine, which causes the thrust of the shield tail jack to the segment ring, and the direction are considered, so that the longitudinal stress characteristic of the shield tail segment ring in the actual construction process of the tunnel and the influence on the floating of the segment are better reflected. The shearing rigidity of the ring joint of the adjacent pipe pieces is considered, the longitudinal characteristics of bending deformation and shearing deformation of the tail pipe piece ring of the shield can be better reflected, the displacement, dislocation and additional internal force caused by floating of the tail pipe piece ring of the shield can be more accurately determined, and a basis is provided for the process control of construction.
Description
Technical Field
The invention discloses a method for establishing a segment ring floating and slab staggering fine model separated from a shield tail, and belongs to the technical field of underground engineering construction.
Background
With the rapid development of national economy and the rapid expansion of urban scale in China, urban traffic congestion has become a common problem in large cities. The adoption of large-flow subway transportation is an effective traffic organization form for the efficient operation of large cities, and the shield tunnel construction method becomes a mainstream method for urban subway construction due to the functions of small influence on urban traffic and safe, efficient and rapid tunneling.
The construction process of segment splicing at the tail part of the shield tunneling machine inevitably causes an annular gap, namely a shield tail gap, to exist between a spliced segment ring and a stratum. And the shield segment wall post-grouting is to actively control the stratum settlement and stabilize the segments by pumping slurry into the gaps in a shield tunnel construction method. The dual-liquid grouting method has the advantages that the dual-liquid grouting with the quick setting characteristic is adopted for synchronous grouting in foreign countries, the functional requirements of the grouting process after the wall are met, but the requirements on the quality of operating personnel are high, otherwise, frequent shutdown is easily caused to block the pipe, and the construction period is seriously influenced. Because of this, the grouting liquid after the shield tail wall in the domestic subway construction generally adopts single grout, and the initial setting time is too long, so that the segment ring which is just separated is in the wrapping of the liquid grout for a long time. Through preliminary calculation, the buoyancy of the slurry borne by the segment ring at the initial stage is nearly 4 times of the self weight of the segment ring, and the segment ring floating from the shield tail is inevitable. The on-site construction monitoring result of the existing subway shield tunnel shows that the upward floating amount of a segment ring just separated from the shield tail is several centimeters to ten and several centimeters, so that the segment assembling quality cannot meet the design requirement, and the phenomena of segment breakage, crack, slab staggering and leakage are comparable, thereby bringing huge challenges to future subway operation safety and tunnel maintenance.
The following two problems exist for solving the problem at present: 1) how the floating force of the slurry on the pipe sheet ring is determined and the change rule of the slurry on the pipe sheet ring along with time are not clear at present; 2) in order to reduce segment ring dislocation, various positioning bolts, positioning tenons and other various forms are developed on the side surface of the segment ring, and the contribution of the positioning bolts, the positioning tenons and the like to the shearing rigidity of joints between the segment rings is not clear at present. With the increasing importance of China on the subway construction quality, the solution of the problem is on schedule, which causes the high importance of China in the engineering and academic circles.
Disclosure of Invention
The invention provides a method for establishing a segment ring floating and slab staggering refinement model separated from a shield tail, aiming at overcoming the defects in the prior art, and providing a method for establishing a segment ring floating and slab staggering refinement three-dimensional model separated from a shield tail.
The technical solution of the invention is as follows: a method for establishing a segment ring floating and slab staggering refinement model escaping from a shield tail comprises the following steps:
the method comprises the following steps of firstly, investigating the structural structure and mechanical parameters of a shield pipe sheet ring:
the structural parameters of the shield pipe sheet ring are as follows: the inner diameter and the outer diameter of the shield segment ring, the segment ring width, the segment concrete elastic modulus, the shear modulus, the friction coefficient, the model number and the number of the connecting bolts between the segment rings, the length of the bolts, the diameter of the bolts, the shear modulus of the bolts, the type number and the tenon size of the positioning tenons between the segment rings.
Secondly, determining the shearing rigidity of the adjacent pipe sheet ring joint:
and determining the shearing rigidity of the segment ring joint by establishing a finite element numerical model of staggering of adjacent two-ring or three-ring segment rings by considering the bolt between the segment rings, the positioning tenon connection and the segment ring seam contact.
Thirdly, testing the buoyancy of the grouting liquid after the tail pipe sheet ring of the shield is separated:
through the slurry buoyancy test device developed independently, the change rule of different types of slurry with time under the action of different grouting pressures is researched.
Fourthly, collecting the thrust of the shield tail jack to the shield tail just assembled pipe sheet ring and the direction:
and in the shield propelling process, determining the magnitude and direction of the thrust of the shield tail jack acting on the pipe sheet ring according to the reading of the pressure of the oil cylinder jack, the posture of the shield tunneling machine and the posture of the shield tail assembled pipe sheet ring.
And fifthly, establishing a three-dimensional calculation model of the segment ring floating from the shield tail:
and (3) obtaining the structural characteristics based on the first step to the fourth step, obtaining the shearing rigidity of the segment ring joint by the time-varying buoyancy of the segment ring or calculating and analyzing, establishing a shell-spring model accurately considering the actual structural stress characteristics of the shield segment ring, and determining the floating amount, the opening amount, the dislocation and the additional internal force caused by floating of the segment ring out of the shield tail. The shell is adopted to simulate the duct piece, and the spring is adopted to simulate the axial and shearing mechanical properties of the annular joint of the duct piece.
The thrust of the shield tail jack to the segment ring which is separated from the shield tail pipe is considered, and the influence of the shield tail jack on the thrust direction of the segment ring caused by the change of the posture of the shield machine and the posture of the segment is considered.
The shearing rigidity of the adjacent segment ring joint comprehensively considers the shearing resisting effect of the bolts and the positioning tenons connected with the adjacent segment rings and the friction of the annular concrete of the adjacent segment rings, so that the shearing rigidity of the segment ring joint is more accurate.
The segment ring floating fine model separated from the shield tail comprehensively considers the thrust of a shield tail jack, the direction and the buoyancy of slurry borne by a segment and the shearing rigidity of a segment ring joint, is more accurate and reliable compared with the former model, and the result obtained by calculation provides important reference for the floating of the segment ring of the subway shield and the dislocation control.
The invention has the beneficial effects that:
1) the invention can better reflect the longitudinal stress characteristic of the shield tail pipe ring and the influence on the floating of the pipe piece in the actual construction process of the tunnel by considering the change of the shield tail jack to the thrust of the pipe piece ring and the direction caused by the posture change of the shield tunneling machine.
2) According to the invention, the shearing rigidity of the adjacent pipe sheet ring joint is considered, so that the longitudinal characteristics of bending deformation and shearing deformation of the tail pipe sheet ring of the shield can be better reflected, the displacement, dislocation and additional internal force caused by floating of the tail pipe sheet ring of the shield can be more accurately determined, and a basis is provided for the process control of construction.
3) The method solves the engineering problem that the segment ring floating displacement from the shield tail is difficult to accurately determine, the platform is staggered and the additional internal force caused by floating is difficult to accurately determine in the shield tunnel construction process, can accurately simulate the influence of various factors of shield construction on the segment ring floating of the shield tail pipe, and provides important reference for the selection of segment floating prevention measures.
Drawings
FIG. 1 is a schematic view of 1/19 calculation model of three-ring joint shear.
FIG. 2 is a schematic diagram showing the variation of the buoyancy of the shield tail grouting liquid on the segment ring along with the shield process.
FIG. 3 is a schematic diagram of the stress analysis and boundary conditions after the segment ring is pulled out of the shield tail.
FIG. 4 is a schematic diagram showing the longitudinal variation of floating displacement of a segment ring from the tail of a shield.
FIG. 5 is a schematic view showing the change of the segment circumferential sewing staggering station along the longitudinal direction of the segment rings.
Detailed Description
The invention provides a method for establishing a segment ring floating and slab staggering fine model separated from a shield tail, which accurately determines the floating amount of segments dragged by the shield tail and the additional internal force of a shield tunnel caused by segment floating, and provides help for further analyzing the segment floating mechanism. And fitting by combining the data of the actually measured floating amount of the duct piece on the site. The shield tail out-of-segment floating amount and the additional internal force under the conditions of different shield tail thrust forces and directions and different adjacent segment ring shearing rigidity in different backfill grouting wrapping states are predicted, and the phenomena of platform dislocation, cracks, damage, even axis deviation and the like caused by segment floating are avoided.
A method for establishing a segment ring floating and slab staggering refinement model separated from a shield tail aims to overcome the defects in the prior art, and provides a method for establishing a segment ring floating and slab staggering refinement three-dimensional model separated from the shield tail.
The technical solution of the invention is as follows: a method for establishing a segment ring floating and slab staggering refinement model escaping from a shield tail comprises the following steps:
the method comprises the following steps of firstly, investigating the structural structure and mechanical parameters of a shield pipe sheet ring:
the structural parameters of the shield pipe sheet ring are as follows: the inner diameter and the outer diameter of the shield segment ring, the segment ring width, the segment concrete elastic modulus, the shear modulus, the friction coefficient, the model number and the number of the connecting bolts between the segment rings, the length of the bolts, the diameter of the bolts, the shear modulus of the bolts, the type number and the tenon size of the positioning tenons between the segment rings.
Secondly, determining the shearing rigidity of the adjacent pipe sheet ring joint:
and determining the shearing rigidity of the segment ring joint by establishing a finite element numerical model of staggering of adjacent two-ring or three-ring segment rings by considering the bolt between the segment rings, the positioning tenon connection and the segment ring seam contact.
Thirdly, testing the buoyancy of the grouting liquid after the tail pipe sheet ring of the shield is separated:
through the slurry buoyancy test device developed independently, the change rule of different types of slurry with time under the action of different grouting pressures is researched.
Fourthly, collecting the thrust of the shield tail jack to the shield tail just assembled pipe sheet ring and the direction:
and in the shield propelling process, determining the magnitude and direction of the thrust of the shield tail jack acting on the pipe sheet ring according to the reading of the pressure of the oil cylinder jack, the posture of the shield tunneling machine and the posture of the shield tail assembled pipe sheet ring.
And fifthly, establishing a three-dimensional calculation model of the segment ring floating from the shield tail:
and (3) obtaining the structural characteristics based on the first step to the fourth step, obtaining the shearing rigidity of the segment ring joint by the time-varying buoyancy of the segment ring or calculating and analyzing, establishing a shell-spring model accurately considering the actual structural stress characteristics of the shield segment ring, and determining the floating amount, the opening amount, the dislocation and the additional internal force caused by floating of the segment ring out of the shield tail. The shell is adopted to simulate the duct piece, and the spring is adopted to simulate the axial and shearing mechanical properties of the annular joint of the duct piece.
The thrust of the shield tail jack to the segment ring which is separated from the shield tail pipe is considered, and the influence of the shield tail jack on the thrust direction of the segment ring caused by the change of the posture of the shield machine and the posture of the segment is considered.
The shearing rigidity of the adjacent segment ring joint comprehensively considers the shearing resisting effect of the bolts and the positioning tenons connected with the adjacent segment rings and the friction of the annular concrete of the adjacent segment rings, so that the shearing rigidity of the segment ring joint is more accurate.
The segment ring floating fine model separated from the shield tail comprehensively considers the thrust of a shield tail jack, the direction and the buoyancy of slurry borne by a segment and the shearing rigidity of a segment ring joint, is more accurate and reliable compared with the former model, and the result obtained by calculation provides important reference for the floating of the segment ring of the subway shield and the dislocation control.
Example 1
In the construction process of a large-diameter shield of a certain Chengdu subway, a segment ring just separated from a shield tail has the risks of floating, dislocation and even leakage.
Firstly, investigating the structural structure and mechanical parameters of the shield segment ring
According to investigation, the outer diameter of the tunnel is 8.3m, the inner diameter is 7.5m, the ring width is 1.5m, the whole ring is composed of 7 pipe pieces (1 +2+ 4), and the split joint assembly is carried out. The section of jurisdiction adopts C50 concrete, and the main muscle is HRB400 level reinforcing bar, and the circumferential weld passes through 19M 30 bolted connection, and bolt mechanical properties is 8.8 levels, and the initial clearance 3mm in bolt and bolt hole sets up 19 independent location tenons, evenly distributed on the section of jurisdiction ring side, has 2.5mm free deformation space between location tenon and the draw-in groove.
Second, determining the shearing rigidity of the ring joint of the adjacent pipe sheets
Through investigation, adjacent pipe sheet ring joints are connected by adopting arc-shaped bolts and positioning tenons. The bolt refers to a steel bar constitutive model without yield point in concrete structure design Specifications (GB 50010-2010). The positioning tenon is a novel assembled tenon sleeve, and the mechanical property of the positioning tenon sleeve is measured according to GB/T32382 and 2015 determination of the shearing property of the heat insulation product for the building.
The shear force distribution can be carried out according to the average effect under the condition that the annular joints are all sheared under the longitudinal shearing action, so that the shear stiffness of the annular joint can be simply analyzed only aiming at local blocks comprising a group of shear members. The whole ring 1/19 of the segment is taken for modeling, the segment is simplified into a flat plate, and a finite element numerical model of the staggered platform of the adjacent two-ring or three-ring segment ring is established according to the design size, wherein bolts between the segments of the segment, positioning tenon connection and segment circular seam contact are considered, and is shown in figure 1. Other boundary conditions: the side surface restrains the displacement in the x direction, and the two ends restrain the displacement in the z direction.
And calculating to obtain a development rule of the shear stiffness of the circular seam, which is shown in table 1.
TABLE 1 non-linear shear rigidity value-taking table for circular seam joint
| Stage of deformation | Circular seam staggering step (mm) | Circular seam shear stiffness (kN/m) |
| Friction at |
0~2.5 | 17000 |
| Positioning tenon engagement | 2.5~6.0 | 180000 |
| Bolt begins to shear | 6.0~9.7 | 71500 |
| Dislocation 20mm | 9.7~20.0 | 33000 |
| Dislocation 30mm | 20.0~30.0 | 9000 |
| Staggered platform>30mm | >30.0 | 0 |
Thirdly, testing the buoyancy of the slurry injected into the wall from the tail pipe ring of the shield
Taking the case of penetrating through a silt stratum and grouting behind the wall as cement mortar (initial setting time is 10 h), the buoyancy test result acting on the pipe sheet ring is shown in figure 2.
Fourthly, collecting the thrust of the shield tail jack to the shield tail rigid assembled pipe sheet ring and the direction
Through investigation, the total thrust of the jack of the shield tunneling machine to the shield tail just assembled pipe piece ring is 10000kN, the direction is coincident with the axis of the pipe piece, and no eccentricity exists.
Fifthly, establishing a three-dimensional calculation model of segment ring floating from the shield tail
And establishing a three-dimensional calculation model of the floating of the tube sheet ring of the shield tunnel. The buoyancy of the duct piece coming out of the shield tail refers to the third step test result, and the restraint of the shield tail steel wire brush and the duct piece ring with stable solidified slurry is considered, and the boundary condition of the three-dimensional duct piece ring model is shown in figure 3.
After the model is built, the calculation results of the floating displacement and the slab staggering amount of the duct piece coming out of the shield tail are shown in fig. 4-5. The actually measured maximum segment ring floating displacement is 10.01cm, the dislocation amount is 0.35cm, and the actual test result is relatively close, which shows that the method for establishing the refined three-dimensional calculation model is reliable and has higher precision.
Claims (6)
1. A method for establishing a segment ring floating and slab staggering refinement model escaping from a shield tail is characterized by comprising the following steps:
(1) investigating the structural structure and mechanical parameters of the shield pipe sheet ring;
(2) determining the shearing rigidity of the adjacent segment ring joint;
(3) testing the buoyancy of the grouting liquid after the shield tail pipe sheet ring is pulled out;
(4) collecting the thrust magnitude and direction of the shield tail jack to the shield tail assembled pipe sheet ring;
(5) and establishing a three-dimensional calculation model of the segment ring floating from the shield tail.
2. The method for establishing the segment ring floating and slab staggering refinement model escaping from the shield tail according to claim 1, wherein the step (1) is used for investigating the structural structure and mechanical parameters of the segment ring of the shield: the structural construction and mechanical parameters comprise the inner diameter and the outer diameter of the shield segment ring, the segment ring width, the segment concrete elasticity modulus, the shear modulus, the friction coefficient, the type and the number of the connecting bolts between the segment rings, the bolt length, the bolt diameter, the bolt shear modulus, the type and the number of the positioning tenons between the segment rings and the tenon size.
3. The method for establishing the segment ring floating and slab staggering refinement model escaping from the shield tail according to claim 1, wherein the step (2) is used for determining the shearing rigidity of the adjacent segment ring joint: and determining the shearing rigidity of the segment ring joint by establishing a finite element numerical model of staggering of adjacent two-ring or three-ring segment rings by considering the bolt between the segment rings, the positioning tenon connection and the segment ring seam contact.
4. The method for establishing the segment ring floating and slab staggering refinement model for the unshielded shield tail according to claim 1, wherein the step (3) is used for testing the buoyancy of the grouting solution applied to the segment ring of the unshielded shield tail: through thick liquid floating force testing arrangement, study the thick liquid of different grade type under different slip casting pressure effects, its buoyancy is along with the change law of time.
5. The method for establishing the segment ring floating and slab staggering refinement model escaping from the shield tail according to claim 1, wherein the step (4) is used for collecting the thrust of a shield tail jack to a segment ring just assembled on the shield tail: and in the shield propelling process, determining the magnitude and direction of the thrust of the shield tail jack acting on the pipe sheet ring according to the reading of the pressure of the oil cylinder jack, the posture of the shield tunneling machine and the posture of the shield tail assembled pipe sheet ring.
6. The method for building the segment ring floating and dislocation fine model escaping from the shield tail as claimed in claim 1, wherein the step (5) is used for building a three-dimensional calculation model of the segment ring floating escaping from the shield tail: acquiring structural characteristics based on the first step to the fourth step, obtaining the shearing rigidity of a segment ring joint by the time-varying buoyancy of a segment ring or calculating and analyzing, establishing a shell-spring model accurately considering the actual structural stress characteristics of the shield segment ring, and determining the floating amount, the opening amount, the dislocation and the additional internal force caused by floating of the segment ring out of the shield tail; the shell is adopted to simulate the duct piece, and the spring is adopted to simulate the axial and shearing mechanical properties of the annular joint of the duct piece.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051139A (en) * | 2020-09-09 | 2020-12-08 | 中山大学 | Segment joint shear rigidity measuring method, system, equipment and storage medium |
| CN113255037A (en) * | 2021-05-20 | 2021-08-13 | 中国建筑第五工程局有限公司 | Novel estimation method for upward floating amount of double-mode shield tunnel segment in upper soft and lower hard stratum |
| CN113309533A (en) * | 2021-06-17 | 2021-08-27 | 中铁十八局集团有限公司 | Open type TBM expanding excavation anti-planting head method |
| CN114235250A (en) * | 2021-12-01 | 2022-03-25 | 山东大学 | Device and method for testing longitudinal resultant force of duct piece in slurry |
| CN114526088A (en) * | 2022-01-25 | 2022-05-24 | 西南交通大学 | Longitudinal joint equivalent model for researching shield tunnel segment dislocation |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN114526088A (en) * | 2022-01-25 | 2022-05-24 | 西南交通大学 | Longitudinal joint equivalent model for researching shield tunnel segment dislocation |
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| CN111222275B (en) | 2022-08-02 |
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