Abstract
The classification of surrounding rock stability is the critical problem in tunneling engineering. In order to decrease engineering disasters, the surrounding rock stability should be accurately evaluated. The ideal point method is applied to the classification of surrounding rock stability. Considering the complexity of surrounding rock classification, some factors such as rock uniaxial compressive strengthen, integrality coefficient of rock mass, the angle between tunnel axis and the main joint, joints condition, and seepage measurement of groundwater are selected as evaluation indices. The weight coefficients of these evaluation indices are determined by the objective and subjective weighting method, consisting with the delphi method and the information entropy theory. The objective and subjective weighting method is exact and reliable to determine the weights of evaluation indices, considering not only the expert’s experiences, but also objectivity of the field test data. A new composite model is established for evaluating the surrounding rock stability based on the ideal point method and the objective and subjective weighting method. The present model is applied to Beigu mountain tunnel in Jiangsu province, China. The result is in good agreement with practical situation of surrounding rock, which proves that the ideal point method used to classify the surrounding rock in tunnels is reasonable and effective. The present model is simple and has very strong operability, which possesses a good prospect of engineering application.
Highlights
The classification of surrounding rock stability is critical for the design and construction of tunnels
As a comprehensive evaluation method, the ideal point method can simultaneously deal with the comprehensive evaluation of multiple factors and multiple objects
The delphi method can consider the experts’ experience and professional knowledge, and the entropy method can dig the internal information of measured data
Summary
The classification of surrounding rock stability is critical for the design and construction of tunnels. The construction methods and support structures are not rational without an accurate classification of surrounding rock stability. It is a critical engineering question for the crisis management of geological hazards [1]. Collapse frequently occurs in the construction of tunnels, which leads to great economic loss and heavy casualties. It has great realistic significance to do research on the evaluation of surrounding rock stability in tunnels. The rock mass stability is evaluated through the determination of the grade of surrounding rock. The essence of the classification of surrounding rock is engineering analogy
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