Analysis of Safety Influence of Shallow Foundation Pit Excavation on Existing Station
In view of the excavation of foundation pit causes the soil self-weight stress unloading,which change the stress structure of surrounding soil and the stress structure of the existing station,which will cause the safety problems of the existing station,the two-di-mensional finite element calculation model of shallow foundation pit and the existing station is established by using the research method of midas GTS numerical simulation and field monitoring.Combined with the monitoring data of slope vertical displacement,horizontal displacement,surface settlement,horizontal displacement and vertical displacement of existing subway structure,the safety situation of site control is analyzed.The results show that the shallow foundation excavation is divided into three layers,and the vertical displace-ment of the existing station is 4.01 mm and the horizontal displacement is 0.335 mm under the timely control of the slope stability,both of which are less than 20 mm below the safety control standard of the subway,indicating that the existing subway structure is safe and controllable.
foundation pit excavationsubway stationstree changenumerical simulationsite monitoring
万方数据
维普
