Deformation control method and evaluation system of structure for shield underpassing
A control method and structure technology, applied in the field of structure deformation control method and evaluation system, can solve problems such as poor monitoring effect of weak parts of structures, disengagement, structure damage, etc.
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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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