Abstract:

Some problems, i.e. multiple partition of tunnel excavation, low construction efficiency and large deformation of softweak surrounding rock, happen frequently due to not enough attention paid to surrounding rock reinforcement and bearing capacity. Hence, the practice and study of partial railway tunnels and relevant investigations on active control deformation technologies in coal industry and at home amd abroad are studied. Some conclusions are drawn as follows: (1) The active deformation control of surrounding rock during tunnel construction can fully develop the bearing capacity of surrounding rock. (2) By using active deformation control of surrounding rock, the rapid large crosssection mechanized construction in softweak surrounding rock can be realized； the design and construction difficulties of superlarge crosssection can be solved; the deformation of soft rock tunnel with high ground stress can be effectively controlled; and large deformation can be avoided. (3) The anchor bolt, anchor rope and grouting reinforcement are the key technologies of active deformation control of surrounding rock; meanwhile largescale equipment should be arranged to guarantee the timeliness and effectiveness of anchoring effect.

Key words: railway tunnel, tunnel construction, active control deformation