Abstract:

The engineering geological properties of the expansive soil tunnel were studied by means of statistical analysis and laboratory test. The physical and mechanical properties of the expansive soil were completely studied. And the  subclass refined classification standards of soil tunnel were proposed, which had practical reference value. Combined with parameters provided by images of geological radar, the subclass refinement of expansive tunnel was performed, which could amend the tunnel support parameters and improve the overall support system. The results provided a theoretical basis for the reasonable evaluation of the characteristics and the design of support parameters of the expansive soil, which was of practical significance for future design and construction of the expansive soil tunnels.

Key words: the expansive soil tunnel, surrounding rock classification, sub-class refinement, lining support measures