Abstract：Overlapping tunnels will influence each other during construction stage，and will result in a series of problems such as ground subsidence controlling，particularly for watery and weak surrounding rocks in shallow depth. Based on the in-situ information of stratum displacement of Guomao—Laojie overlapping tunnels in Phase I of Shenzhen Metro，basic movement characters of stratum induced by overlapping tunnels in watery and weak surrounding rocks were analyzed. The notable characteristics in construction are to possess a large ground surface subsidence，outburst of stratum deformation，high loss ratio of the stratum，large curvature and slope of the ground surface subsidence. The loss ratio of the stratum is as high as 9.2%，which is much larger than that of common tunnels constructed in normal stratum. The mechanisms and major influential factors of stratum deformation are also explored considering host medium and engineering conditions. Subsequently，corresponding technologic measures of how to control the large deformation in stratum of overlapping tunnels are proposed. The measures were also applied to the construction in Phase I of Shenzhen Metro，and a good effect has been achieved. The research result can provide reference to controlling the stratum deformation induced by overlapping tunnels construction in the similar stratum.
