Abstract:

Geological conditions, tunnel design and tunnel construction are analyzed in order to control the large deformation of the tunnel section in carbonaceous slate with high ground stress. Reasonable reinforcement parameters are selected, the surrounding rocks are protected, long bolts and footlocking bolts are installed, the tunnel crosssection is optimized, reasonable deformation is allowed and deformation controlling standards are established. Construction technologies such as timely reinforcement strengthening, short or supershort bench excavation method, immediate reinforcement, immediate reinforcement structure closing and timely lining are adopted, which have brought the deformation under effective control.

Key words: tunnel, high ground stress, carbonaceous slate, large deformation