Model range value taking method of excavation numerical value simulation analysis of deep-buried tunnel construction

Abstract

The invention provides a model range value taking method of the excavation numerical value simulation analysis of deep-buried tunnel construction. The model range value taking method comprises the following steps: establishing numerical value calculation models under different model ranges, and carrying out the excavation numerical value simulation of a tunnel; calculating a displacement error, extracting an integral displacement error, adopting a least square method to analyze influence on the integral displacement error by model ranges of different directions, and discussing a function relationship between the integral displacement error and the model ranges; and on the basis of the function relationship between the integral displacement error and the model ranges, limiting a certain integral displacement error allowable value, and taking model range minimum as a target to determine a model range optimal value. The model range value taking method can simultaneously consider the influence of model sizes of different directions so as to determine the optimal model range, can be widely applied to the excavation numerical value simulation of the deep-buried tunnel construction, and establishes and provides guidance for a numerical value model of the deep-buried tunnel.

Description

technical field [0001] The invention relates to the field of numerical simulation analysis of deep-buried tunnels, in particular to a model range value selection method for numerical simulation analysis of excavation of deep-buried tunnels. Background technique [0002] Numerical simulation refers to relying on computers to study engineering problems, physical problems and even various problems in nature through numerical calculation methods. In the numerical simulation analysis of deep tunnels, since the left, right and lower areas are infinite, the value of the range is an unavoidable problem in numerical simulation calculations. Excessively large model range will lead to a huge amount of calculation, which will affect the calculation efficiency, while too small model range will produce large boundary effects, which will affect the accuracy of numerical simulation. Computational models have important guiding significance and practical value. [0003] The selection of the...

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Problems solved by technology

[0004] Therefore, there are problems in the selection of the existing numerical model range: (1) The selection of the model range is mostly based on experience, the values ​​are not uniform, and the principle of value selection is not clear; (2) After the model range is selected, it is impossible to determine the selected model range. The degree of influence of the calculation results; (3) In the selection of the range of the horizontal model, the size of the model in each direction is not distinguished

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