According to the principle of highway road mill machine and mature technology of tunnel loader,propose the plan of develop the tunnel ripping machine,the work installment——mill drum of this machine becomes the most important part to research.

Developing the bottom ripping machine is important for restoration of the destructed bottom which causes by the mine pressure.

Research on the optimized decision-making method of the least security coping thickness of subsea tunnel;

Study on the durability of lining concrete of subsea tunnel;

Study on numerical method for the minimum rock covers of subsea tunnels;

Analysis of causes and disposals for water gushing of land regions Xiamen of submarine tunnel;

Waterproof engineering of submarine tunnel in Xiamen Xiangan;

Displacement convergence method for minimum rock cover above submarine tunnel;

Constructing skill research of Xiamen seabed tunnel;

The construction of seabed tunnel is conducted under conditions of seawater,water bursting passage(fault crack),hydraulic pressure and construction disturbance,so the collapse and water bursting will happen if there is any carelessness in the construction,resulting in disaster outcome.

Xiamen seabed tunnel is first the seabed tunnel in our country continent district, and is a milestone in our country tunnel, and possesses the important influence to the later tunnel construction.