MUTUAL TURBULENCE ANALYSIS FOR PARALLEL TUNNEL CON-STRUCTION OF SHIELD AND MINE TUNNELING METHODS

The pattern and extend of turbulence to surrounding rock, produced by the tunnel constructions are different between shield and mine tunneling methods. The mutual turbulence in tunnels in parallel proximity are to be different between shield and mine tunneling methods. This paper is based on the tunnel construction using both shield and mine tunneling methods in small clear distance in Baifo tunnel section in 1^# route in Nanning Rail Transit. The monitoring system is established according to the real construction progress. The mutual turbulence in vertical and horizontal displacements produced by each other is analyzed. When the shield tunnel is constructed backward, the push function of the shield can promote the tunnel constructed with mine tunneling method forward to produce crown rising and clearance contraction. The soften function by the shield to the surrounding rock and the settlement function by the shield construction, can promote the tunnel constructed with mine tunneling method forward to produce crown settlement and clearance dilatation. When the tunnel with mine tunneling method is constructed backward, its side unloading function can promote the tunnel constructed with shield method forward to produce lining rising and clearance dilatation. The research results have revealed the mutual turbulence principle between the two parallel tunnels with shield and mine tunneling methods, which can supply technique support for the construction sequence choice and auxiliary construction measures choice, for similar small clear distance parallel tunnels.