CN111259556A - Safety evaluation method based on shield tunnel segment joint opening amount - Google Patents
Safety evaluation method based on shield tunnel segment joint opening amount Download PDFInfo
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- CN111259556A CN111259556A CN202010067874.4A CN202010067874A CN111259556A CN 111259556 A CN111259556 A CN 111259556A CN 202010067874 A CN202010067874 A CN 202010067874A CN 111259556 A CN111259556 A CN 111259556A
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- opening amount
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- 238000011156 evaluation Methods 0.000 title claims abstract description 15
- 230000007935 neutral effect Effects 0.000 claims description 9
- 239000004567 concrete Substances 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 230000008859 change Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000006386 neutralization reaction Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- -1 bolt corrosion Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000005297 material degradation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Classifications
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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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- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a safety evaluation method based on the opening amount of a segment joint of a shield tunnel, which is used for calculating and judging whether the tensile stress of a bolt at the maximum opening position of the joint exceeds a limit value according to the opening amount of the joint so as to ensure the safety and the stability of the shield tunnel and discloses a relational expression of the stress of a joint bolt and the opening amount of the joint. The invention can quickly evaluate the safety of the tunnel structure and provides a new way for evaluating the safety of the shield tunnel structure.
Description
Technical Field
The invention relates to the technical field of tunnel engineering, in particular to a safety evaluation method based on shield tunnel segment joint opening amount.
Background
In recent years, with the development of railway and road network construction, high-standard railway and road tunnel construction has been fully developed. Due to the restriction of various factors such as complex topographic and geological conditions, high design and use requirements and the like, higher requirements are put forward on the safety of the shield tunnel.
At present, in the process of constructing a tunnel by adopting a shield method, a circular lining ring is constructed by assembling prefabricated reinforced concrete segments into an assembled segment. Wherein, the segments are connected by transverse and longitudinal bolts. The joints of the duct pieces are always the key points of the design and construction of the shield tunnel, and whether the shield tunnel is safe or not is concerned. The rigidity of section of jurisdiction seam department than whole cast in situ concrete structure is littleer, and because the seam passes through stagnant water rubber seal between the section of jurisdiction, consequently when the seam is opened too big, can lead to the seepage to gush water, the inflow of soil sand, bolt corrosion, concrete material degradation, structural integrity stability and a series of bad problems such as descend, threaten shield tunnel's safety and stability. At present, methods for evaluating the safety of the shield tunnel mainly comprise model tests and numerical simulation, and a reliable method for judging the safety of the shield tunnel by considering an important index of joint opening amount is not available.
TABLE 1-1 design values of strength (N/mm) of pressure-bearing type high-strength bolted connection2)
Disclosure of Invention
The invention aims to provide a safety evaluation method based on the opening amount of a shield tunnel segment joint.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the invention discloses a safety evaluation method based on shield tunnel segment joint opening amount, which calculates and judges whether bolt tensile stress at the maximum joint opening position exceeds a limit value according to the joint opening amount so as to ensure the safety and stability of a shield tunnel, wherein the relation between joint bolt stress and the joint opening amount is determined by an equation (1):
in the formula: sigmaBFor joint bolt stress, x is the distance from the compressed outer edge to the neutral axis, d is the effective height of the tensile member, ABThe effective area of the bolt is M, and the bending moment at the joint is M.
Preferably, the distance x from the compressed outer edge to the neutralization axis is determined by equation (2):
wherein n is the elastic modulus ratio; and b is the width of the tube sheet.
Preferably, the bending moment M at the joint is determined by equation (3):
in the formula, kjIs the tensile spring constant at the joint, EcThe modulus of elasticity of the concrete is shown, delta is the opening amount of the joint, and h is the height of the pipe piece.
Preferably, the formula (1) is based on the following conditions:
a. the cross section assumes: the pipe piece is kept as a plane before and after being deformed under stress, and the stressed area of the pipe piece meets the assumption of a flat section;
b. the small deformation assumption is that: the deformation and rotation of the segment structure at the joint under the action of load are far smaller than the geometric dimension of the member;
c. material homogeneity assumption: the structure of the duct piece is assumed to be an isotropic material, and the mechanical properties of all points of the component are the same;
d. the change of the coefficient of the rotating spring of the segment joint is assumed to be extremely small and ignored;
e. a tensile member is arranged at the segment structure joint, and the neutral axis is positioned between the bolt and the pressed edge;
f. the depth of influence of concrete on the corner of the compression area is 2 times of the distance from the compressed edge of the segment to the neutral axis.
The invention has the following beneficial effects:
1. according to the method, the stress condition of the bolt at the joint can be judged by calculation by technicians in the field according to the maximum opening amount of the segment joint, and therefore, the safety evaluation of the tunnel structure can be rapidly carried out, and a new way for the safety evaluation of the shield tunnel structure is provided.
2. The method can accurately judge whether the shield tunnel structure is in a safe state, improve the efficiency of safety evaluation and ensure the safety of the shield tunnel structure during construction and operation. Compared with other safety evaluation methods, the method has the advantages of simplicity, convenience, economy and rapidness, and the calculation method is reliable, simple to operate and easy to popularize.
Drawings
FIG. 1 is a schematic view of segment joint parameters.
Fig. 2 is a schematic view of a deformation at a joint.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings.
As shown in fig. 1 and 2, the safety evaluation method based on the opening amount of the joints of the segments of the shield tunnel disclosed by the invention is to calculate and judge whether the tensile stress of the bolts at the maximum opening position of the joints exceeds the limit value according to the opening amount of the joints so as to ensure the safety and stability of the shield tunnel, and the relationship between the stress of the joint bolts and the opening amount of the joints is determined by an equation (1):
in the formula: sigmaBFor joint bolt stress, x is the distance from the compressed outer edge to the neutral axis, d is the effective height of the tensile member, ABThe effective area of the bolt is M, and the bending moment at the joint is M.
Specifically, the distance x from the compressed outer edge to the neutralization axis is determined by equation (2):
wherein n is the elastic modulus ratio; and b is the width of the tube sheet.
Specifically, the bending moment M at the joint is determined by equation (3):
in the formula, kjIs the tensile spring constant at the joint, EcThe modulus of elasticity of the concrete is shown, delta is the opening amount of the joint, and h is the height of the pipe piece.
The invention is based on the following assumptions:
a. the cross section assumes: the pipe piece is kept as a plane before and after being deformed under stress, and the stressed area of the pipe piece meets the assumption of a flat section;
b. the small deformation assumption is that: the deformation and rotation of the segment structure at the joint under the action of load are far smaller than the geometric dimension of the member;
c. material homogeneity assumption: the structure of the duct piece is assumed to be an isotropic material, and the mechanical properties of all points of the component are the same;
d. the change of the coefficient of the rotating spring of the segment joint is assumed to be extremely small and ignored;
e. a tensile member is arranged at the segment structure joint, and the neutral axis is positioned between the bolt and the pressed edge;
f. the depth of influence of concrete on the corner of the compression area is 2 times of the distance from the compressed edge of the segment to the neutral axis.
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention.
Claims (4)
1. A safety evaluation method based on shield tunnel segment joint opening amount is characterized in that whether bolt tensile stress at the maximum joint opening position exceeds a limit value is calculated and judged according to the joint opening amount to ensure safety and stability of a shield tunnel, and the relation between joint bolt stress and the joint opening amount is determined by an equation (1):
in the formula: sigmaBFor joint bolt stress, x is the distance from the compressed outer edge to the neutral axis, d is the effective height of the tensile member, ABThe effective area of the bolt is M, and the bending moment at the joint is M.
2. The shield tunnel segment joint opening amount-based safety evaluation method according to claim 1, wherein the distance x from the compressed outer edge to the neutralization axis is determined by the formula (2):
wherein n is the elastic modulus ratio; and b is the width of the tube sheet.
3. The safety evaluation method based on the shield tunnel segment joint opening amount according to claim 1 or 2, characterized in that: the bending moment M at the joint is determined by equation (3):
in the formula, kjIs the tensile spring constant at the joint, EcThe modulus of elasticity of the concrete is shown, delta is the opening amount of the joint, and h is the height of the pipe piece.
4. The safety evaluation method based on the shield tunnel segment joint opening amount according to claim 3, characterized in that: the formula (1) is based on the following conditions:
a. the cross section assumes: the pipe piece is kept as a plane before and after being deformed under stress, and the stressed area of the pipe piece meets the assumption of a flat section;
b. the small deformation assumption is that: the deformation and rotation of the segment structure at the joint under the action of load are far smaller than the geometric dimension of the member;
c. material homogeneity assumption: the structure of the duct piece is assumed to be an isotropic material, and the mechanical properties of all points of the component are the same;
d. the change of the coefficient of the rotating spring of the segment joint is assumed to be extremely small and ignored;
e. a tensile member is arranged at the segment structure joint, and the neutral axis is positioned between the bolt and the pressed edge;
f. the depth of influence of concrete on the corner of the compression area is 2 times of the distance from the compressed edge of the segment to the neutral axis.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010067874.4A CN111259556B (en) | 2020-01-20 | 2020-01-20 | Safety evaluation method based on shield tunnel segment joint opening amount |
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| CN202010067874.4A CN111259556B (en) | 2020-01-20 | 2020-01-20 | Safety evaluation method based on shield tunnel segment joint opening amount |
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| CN111259556B CN111259556B (en) | 2022-06-07 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115098928A (en) * | 2022-07-12 | 2022-09-23 | 西南交通大学 | Shield tunnel risk assessment method based on Gaussian process meta-model for active learning |
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| CN104537162A (en) * | 2014-12-16 | 2015-04-22 | 上海交通大学 | Method for determining capability of resisting slab staggering and expanding deformation of joints between shield tunnel lining rings |
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| CN107083971A (en) * | 2017-06-27 | 2017-08-22 | 华东交通大学 | A kind of zero moment of flexure shield tunnel |
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2020
- 2020-01-20 CN CN202010067874.4A patent/CN111259556B/en active Active
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| CN106321115A (en) * | 2016-11-08 | 2017-01-11 | 苏州大学 | Shielded tunnel structure model construction method |
| CN107083971A (en) * | 2017-06-27 | 2017-08-22 | 华东交通大学 | A kind of zero moment of flexure shield tunnel |
| CN108086995A (en) * | 2017-11-27 | 2018-05-29 | 中国铁路总公司 | A kind of shield（TBM）Tunnel pipe sheet built seam tests loading method |
| CN109707400A (en) * | 2018-12-19 | 2019-05-03 | 上海勘察设计研究院(集团)有限公司 | The relative rotation evaluation method of the adjacent piecemeal of circular shield straight joint tunnel duct piece |
| CN110375722A (en) * | 2019-06-25 | 2019-10-25 | 北京工业大学 | A method of duct pieces of shield tunnel joint open is extracted based on point cloud data |
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