Segment lining crack disease treatment in the shield tunnel;

Simulation on relaxation effect of vertical earth pressure for shield tunnels by particle flow code;

Grope for shield tunnel construction induced ground maximal settlement;

Probe into construction method for connecting tunnel between two shield tunnels;

Taking the shield tunnels which go through adjacently the piled foundation of a building of 7 storeys for example,a two-dimensional numerical calculating model is established by using the finite ele- ment code RFPA~(2D).

Methods for estimating subsurface ground movements induced by shield tunneling

Since the important contribution of the foamed soil in preventing the seepage damage and stabilizing the shield tunneling face, a new foam generator is developed and a series of experiments are conducted for foam modified soils in t.

Based on the analysis of the mechanism of synchronous grouting in shield tunneling,the grouting pressure and grouting volume are studied by the methods of theoretic analysis and calculation.

Where a shield-driven tunnel is constructed underneath a pipe culvert,the GPS technology is applied in the horizontal deformation monitoring so as to provide horizontal displacement parameters for the boring of the shield machine,through which the pattern of the horizontal deformation of the pipe culvert resulting from the boring of the shield machine is obtained.

Jointed segmental concrete lining is the main bearing component of the shield-driven tunnel; its structural properties directly affect the safety of tunnel.

Recently, the shield-driven tunnel has been constructed in the soft soil of cities, which bring forward some new problems at the same time.