Analysis on influence and control measures of deep foundation pit excavation near subway section
In order to ensure the safety of existing operating tunnels,certain measures should be taken to control the impact caused by deep excavation of tunnels near the subway section within a reasonable range.This article conducts numerical simulation calculations on the im-pact of deep foundation pit excavation on the adjacent subway section,and evaluates the effectiveness of the measures taken based on vari-ous actual monitoring results during the deep foundation pit excavation process.The main conclusions were as follows:during the deep foun-dation pit excavation process,the maximum horizontal displacement of the retaining structure and the existing subway section tunnel were a-bout 12mm and 4mm,respectively,which meet the design requirements.The maximum horizontal displacement of the retaining structure was located in a straight line,and as the excavation depth of the foundation pit increases,the maximum horizontal displacement stabilizes at two-thirds of the depth of the foundation pit.By increasing the waterproof curtain effect and utilizing the spatial effect of excavation methods,the maximum horizontal displacement of the retaining structure is reduced by 10％.
tunnelsdeep foundation pitexcavationnumerical simulationmonitor
NETL
NSTL
万方数据
