A method for identifying void area of sluice foundation on soft foundation
A region identification and voiding technology, applied in the fields of instrumentation, geometric CAD, calculation, etc., can solve the problems of inability to analyze and identify the voiding of the sluice base, and solve the problem of difficulty in evaluating the voiding of the sluice base, high engineering application value, and high efficiency. The effect of economic benefits and practical value
Active Publication Date: 2019-02-01
NANCHANG UNIV
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[0003] The system identification algorithm based on dynamic response is mostly used for the identification of structural material parameters, that is, according to the structural modal parameters, displacement time history and other dynamic responses, the inverse calculation of changes in structural stiffness, damping, etc., so as to obtain a structural model that is more in line with the actual situation; However, this type of algorithm cannot be directly used for the identification of structural boundary conditions, and it is impossible to analyze the void situation of the sluice base
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[0057] The invention will be further illustrated by the following examples.
[0058] 1. Numerical simulation embodiment:
[0059] Model establishment Taking an actual sluice as an example, the finite element model of the structure adopts three-dimensional solid elements, and the material parameters are: elastic modulus 30GPa, Poisson's ratio 0.3, density 2500kg / m 3 . The structural dimensions of the model are: the length perpendicular to the water flow direction is 13.5m, the length in the downstream direction is 14.5m, and the height from the bottom of the floor to the bridge road surface is 19m; the floor structure is alveolar, with a thickness of 3m at both ends and a thickness of 1.5m; the thickness of the retaining wall is 1.5m, the height is 13m (at the working bridge) and 16m, and there is a protruding structure at one end of the retaining wall; the working bridge is T-shaped, only the web is fixed to the retaining wall, and the rest is free. The foundation of the mod...
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A soft foundation water gate base void area identification method comprises the following steps: using finite element software to build a water gate finite element model according to real water gate engineering data and information; using void parameters as correction parameters to describe the void area, and using a gate base void parameter inversion result to indicate the structure real void conditions; building a response surface model between gate base void parameters and structure modal parameters; carrying out water gate base void area inversion identification according to the structure modal parameters. The method can identify water gate base void conditions under a normal work status, thus preventing the water gate structure from being damaged by a damage detection method like drilling coring, and providing high economic benefit and practical values; the method uses a structure boundary state identification algorithm to directly identify a water gate base plate foundation void area according to the water gate structure modal parameters, thus solving the gate base void hard evaluating problems, and providing high engineering application values.
Description
technical field [0001] The invention relates to a method for identifying void areas of sluice foundations on soft foundations. Background technique [0002] During operation, the sluice foundation is subject to water flow, which is prone to hollowing out, which in turn leads to uneven subsidence, sand washing and other diseases. For sluices built on soft foundations or sand foundations, the void phenomenon of the sluice foundation is more obvious. Since the void phenomenon occurs in the hidden underwater structure, it is difficult to find it in manual safety inspection; even if local non-destructive testing techniques such as ground penetrating radar are used, it will fail due to the excessive thickness of the base plate of the sluice gate. Therefore, it is of great significance and value to study an effective method for detecting the void area of the soft foundation sluice foundation to ensure the safe operation of hydraulic structures. [0003] The system identificatio...
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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/367
Inventor 张纯李火坤刘国
Owner NANCHANG UNIV