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A deformation control method and evaluation system for a structure passing under a shield

A control method and structure technology, applied in the field of structure deformation control method and evaluation system, can solve problems such as transverse cracks in pipelines, poor monitoring effect of weak parts of structures, and inclination of the ground surface

Active Publication Date: 2021-03-16
北京住总集团有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (1) Surface subsidence will cause the structure to sink as a whole;
[0008] (2) Uneven settlement will lead to surface inclination, so that structures are prone to structural damage and cracks;
[0011] 2. Impact of shield construction on underground pipelines
[0013] (2) It is easy to distort and even crack the pipe
[0014] (3) Excessive tension and compression will cause leakage or even disengagement of pipe joints
[0015] (4) Large axial shear force or bending moment will cause transverse cracks in the pipeline
However, under different engineering conditions, the damage types and risks of structures are different, and the arrangement of monitoring points based on experience often cannot monitor the most dangerous parts. However, there are still the following deficiencies: the monitoring effect of the weak parts of the structure is not good or the structure has already been damaged but has not been monitored (such as cracks in the corner of the wall)

Method used

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  • A deformation control method and evaluation system for a structure passing under a shield
  • A deformation control method and evaluation system for a structure passing under a shield

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Experimental program
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Embodiment 1

[0044] Numerical analysis model is a mathematical model based on finite element method simulation that is widely used in engineering fields such as hydraulic engineering, civil engineering, mechanical engineering, bridge engineering, and metallurgical engineering. It is mainly a numerical technique for solving approximate solutions of partial differential equation boundary value problems. Since most practical problems are difficult to obtain accurate solutions, finite element not only has high calculation accuracy, but also can adapt to various complex shapes, so it has become an effective method. engineering analysis tools. For example, in tunneling under the shield, the numerical analysis method can simulate the influence of different tunneling speeds of the shield machine 300 on the disturbance of the adjacent soil. Numerical analysis can use existing numerical analysis platforms, such as finite element analysis platforms such as ANSYS, ABAQUS, FLAC-3D, LS-Dyna and MIDAS / GT...

Embodiment 2

[0062] This embodiment may be a further improvement and / or supplement to Embodiment 1, and repeated content will not be repeated here. In the case of no conflict or contradiction, the whole and / or part of the content of the preferred implementations of other embodiments may serve as supplements to this embodiment.

[0063] Preferably, the influence of the physical properties of the stratum surrounding the tunnel to be built on the deformation of the structure 200 is preliminarily analyzed based on a numerical analysis model. During the construction of shield tunneling, the strata encountered are mostly loose soil, clay, silt, sand and pebbles, etc. or a combination of several types. These formations will have a large displacement after the tunnel is formed by the shield, and most studies have shown that the formation factor is one of the more significant factors for the deformation of the structure 200 . Therefore, the numerical analysis results of this embodiment will be ana...

Embodiment 3

[0067] This embodiment may be a further improvement and / or supplement to Embodiments 1 and 2, and the repeated content will not be repeated. In the case of no conflict or contradiction, the whole and / or part of the content of the preferred implementations of other embodiments may serve as supplements to this embodiment.

[0068] The deformation rate threshold can be set at least in the following manner: based on numerical analysis results, the sinking curve of the structure 200 during the simulated tunneling of the shield tunnel is obtained. Among the numerical analysis results, a displacement curve of the center of gravity of the research structure 200 can be obtained. Then, according to the traveling path of the shield cutter head and the rule of the sinking curve, the sinking curve can be divided into early sinking curve, mid-term sinking curve and late sinking curve. The initial sinking curve corresponds to the stage when the shield cutter head does not pass through the s...

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Abstract

The invention relates to a deformation control method and evaluation system of a structure passing under a shield. The method includes: establishing a numerical analysis model for shield tunneling, and outputting preliminary safety assessment and first construction parameters that can be used to evaluate the safety of structures based on the numerical analysis results; The monitoring point of the parameters characterizing the deformation of the structure, and the establishment of a monitoring center, the monitoring center can be used to evaluate the actual safety assessment of the safety of the structure according to the monitoring data fed back by the monitoring point, and at least one of the safety assessments in the actual safety assessment When the parameter is within the dangerous threshold, the first construction parameter is adjusted in combination with the preliminary safety assessment and the actual safety assessment, so that the structure is in a controllable and / or safe state during the shield tunneling construction process.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a deformation control method and evaluation system for a structure passing under a shield. Background technique [0002] As an important part of urban underground space, urban subway has achieved large-scale development in our country. In addition to underground railways, major cities are successively building various underground tunnels such as urban road tunnels, railway tunnels, municipal tunnels, civil air defense tunnels, and power cable tunnels to solve the increasingly serious problem of urban space congestion. However, in the process of urban construction of tunnels, due to the limitations of geological conditions and construction technology, the excavation of shield machines will inevitably disturb the surrounding environment, thus endangering adjacent structures (such as surface structures, pile foundations, underground structures, etc.) The safety and norma...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21D9/093E21D9/00E21F17/18
CPCE21D9/003E21F17/18E21D9/093
Inventor 付春青田世文张鹏远高玉春黄雪梅杨纬华
Owner 北京住总集团有限责任公司