Research and Application of Dynamic Risk Assessment Model for Tunnel Construction of Thin Layered Rock

As a result of the risk and uncertainty of underground engineering itself, a large number of risks had effected the tunnel construction which is complex between mutual relationship, Established risk dynamic assessment system of tunnel construction on thin layered rock, from risk factors as geological conditions, construction methods, technology and management to assess and manage the risks dynamically, that could reduce the risk level from high to low effectively and to reach security, stability construction requirements. Specific case of dynamic risk management and assessment system of thin layered rock in tunnel construction could proof it validity.