Nowadays

ventilation shaft construction in the running tunnel is the first case in China

As people’s awareness of environmental protection

away from the urban core area

more and more tunnel ventilation shafts would be built on the running tunnel.However

study on the tunnel displacement change due to ventilation shaft foundation construction is another new problem of geotechnical engineering area.Combined with ventilation shaft foundation of the Renmin Road tunnel

according to two working conditions

i.e.whether reducing pressure water or not

using MIDAS-GES software to analyze the running tunnel displacement

quantify the deformation degree of two conditions theoretically

discuss the feasibility of the method

and provide theoretical guidance to final choosing.The monitoring data also prove the feasibility of the method which provides an evidence for the same project construction.