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Rock mass mechanical parameter back analysis method

A technology of rock mechanics parameters and rock mass mechanics, which is applied in the field of parameter inverse analysis and can solve problems such as low efficiency, large amount of calculation, and poor solution stability.

Pending Publication Date: 2020-07-14
YICHUN UNIVERSITY
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Problems solved by technology

[0003] The process of parameter back analysis requires a large number of positive analysis numerical calculations. Problems such as large amount of calculation, low efficiency, and poor stability of the solution will affect the preparation of the final result.

Method used

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  • Rock mass mechanical parameter back analysis method
  • Rock mass mechanical parameter back analysis method
  • Rock mass mechanical parameter back analysis method

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Embodiment

[0089] A certain project is located on the main stream that flows through two southwestern provinces at the same time, and the valley width deformation phenomenon in the dam area is relatively obvious. It is necessary to carry out the inversion of rock mechanical parameters in the dam area to provide parameter support for the numerical calculation of valley amplitude deformation mechanism research. Compared with the Maokou Formation limestone and Xuanwei Formation sandstone, the Emeishan dacite in the dam area has a wider distribution range, and the valley width deformation monitoring points are all set on the Emeishan dacite (P2β), and the elasticity of the dacite The modulus, cohesion, and internal friction angle all show a large range of variation (see Table 1), so the elastic modulus, cohesion, and internal friction angle of the Emeishan basalt rock mass are taken as the parameters to be inverted (see Table 1). 2). 40 levels are taken for each parameter. According to the...

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Abstract

The invention discloses a rock mass mechanical parameter back analysis method, and relates to a parameter back analysis method. The method comprises the following steps: S1, determining rock mechanical parameters to be inversed, and constructing a calculation scheme of a training sample on the basis of a uniform test design method; S2, performing numerical calculation on each constructed scheme toobtain a valley amplitude deformation value corresponding to each scheme, and forming an input and output value of an SDCS-LSSVM algorithm by the calculation scheme and the corresponding valley amplitude deformation calculation value; S3, based on the input and output samples obtained in the step S2, establishing a nonlinear mapping relationship between rock mechanics parameters and valley amplitude deformation values by learning input and output sample data; and S4, solving an optimal solution of the target function, and determining an optimal mechanical parameter combination. According to the method, a rock-soil body material parameter back analysis regression model is constructed, an improved cuckoo algorithm is adopted to search inversion parameters most matched with actual measurement displacement from the global space, and the prediction effect of the model is improved.

Description

technical field [0001] The invention relates to a parameter back analysis method, in particular to a rock mass mechanics parameter back analysis method. Background technique [0002] At present, the studies on stability analysis and deformation numerical calculation of geotechnical engineering are all based on accurate rock mechanics parameters. Due to the randomness, heterogeneity, nonlinearity, discontinuity of rock mass materials and the influence of various engineering and construction factors, it is almost impossible to solve it by analytical methods. The back analysis of rock mechanics parameters combines computer technology, numerical analysis methods, optimal design and on-site measurement to infer the initial stress state of geotechnical engineering materials, and carry out information design and construction. Even if the numerical method has a more reasonable calculation model, it is difficult to make a reasonable estimate of the input parameters. Whether the rock...

Claims

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Application Information

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IPC IPC(8): G06F30/13G06F119/14
CPCY02A10/40
Inventor 陆有忠
Owner YICHUN UNIVERSITY
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