Some excavated methods are mainly introduced here,and the construction principal of NATM widely used at present and the principal and construction technology of the advanced grouting support with the big pipe shed are introduced emphatically.

The advanced pipe grouting is an effective technique to avoid the instability of shield-tunneling faces in soft or water-bearing ground.

This paper introduces slip-casting materials and the types of slip casting method,illustrates the theory of slip-casting technique as laneway strengthening method,introduces the application of slip-casting supporting in laneway construction from wall rock,strengthening by water shut off and economy,and points out the developing tendency of the technique.

Construction technology of the pre-grouting small pipe in Dawoshan tunnel;

Three-dimensional FEM is used to calculate the deformation and stability of tunnel under tunnel boring machine (TBM) excavation in big fault zone after pre-grouting.

Room mining technology can be used to recover the residual ore distributing in backfill,and that pre-grouting is necessary for good working conditions.

Combined on high stress and big deformation entry,metal articulated single beam and cross-articulated beam were used with combination,it was analyzed from designed craft and result,and a good experience was raised for spreading metal articulated beam in forepoling of entry.

Starting from the engineering practice,this paper probes into the principles,applicable conditions and construction processes of several forepoling technologies,and introduces the forepoling technology for the tunneling works.