The thesis introduces the spread regularity of blasting stress wave in the different rock formation and impact of the relationship between solution cavity and tunnel space on the tunnel blasting excavation by numeric modeling.

Analysis on the process of water burst catastrophe and it s prevention countermeasures in a karst tunnel;

Influence of long-term draining groundwater in karst tunnel on permeability of its surrounding rock;

Risk management of Karst tunnel of Yichang-Wanzhou Railway

Discussion on influence of initial support to stability and deformation of surrounding rock mass in soft rock tunnel;

Determination of soft rock tunnel frost heaving damage parameter;

The results of the analysis on the deformation characteristics, damage shapes and collapse height of soft rock tunnels indicate that the Hoek-Brown\'s brittleness parameter method is a practical and reliable approach of predicting the collapse height of a tunnel in soft rocks.