Mountain tunnel construction risk assessment method based on computer aided engineering (CAE) finite element model

Abstract

The invention provides a mountain tunnel construction risk assessment method based on a computer aided engineering (CAE) finite element model. The method comprises the steps of establishing a three-dimensional model of a mountain tunnel by means of ABAQUS-CAE software; inputting initial parameters, i.e., the tunnel section form and dimension x of the mountain tunnel, the grade y of surrounding rock and the type z of the lining into the finite element model, and then carrying out finite element calculation by dividing grids to obtain the displacement and stress of the parts such as arch crown,side walls and inverted arch of the tunnel; automatically drawing a stress-time curve and a displacement-time curve by means of automatic software. The curves can intuitively reflect the changes of the stress and displacement of all parts of the interior wall of a tunnel cavern; if abnormal data appears, a risk source of a corresponding site can be accurately found, so that risk warning is performed, and active remedial measures can be taken.

Description

technical field [0001] The invention relates to a tunnel engineering risk assessment method, in particular to a mountain tunnel construction risk assessment method based on a CAE finite element model. technical background [0002] With the continuous development of social economy, the requirements for transportation are also increasing, and more and more mountain tunnels are being built. How to control the construction risks of mountain tunnels is an urgent problem that needs to be solved now. During the construction of mountain tunnels, various risks such as surrounding rock, mud and water inrush, and even rockbursts will be encountered at different levels. Therefore, an accurate assessment of the risks of mountain tunnels requires a comprehensive analysis of the entire construction process. After searching the existing technical literature, it was found that Chinese patent application number 2015100547770, title of invention: progressive risk dynamic assessment method for ...

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Problems solved by technology

It can be seen that the current mountain tunnel risk assessment method is mainly to predict the risk of a certain part, and it is realized by the method of expert scoring, so it is difficult to form an accurate and effective risk assessment for the overall tunnel construction

[0003] The existing progressive risk assessment method for the whole process of water and mud inrush in karst tunnels can only form a risk assessment for the special content of water and mud inrush. However, the possible risks in mountain tunnels are complex and diverse. Tunnel construction forms an effective risk assessment, which cannot meet the overall requirements of mountain tunnel risk assessment

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