Research On Deep Foundation Pit Support Technology For Provincial Hospital Station Of Chengdu Metro Line 5

Chengdu Metro is in its peak period of rapid development.The corresponding deep-pit pits at the station are large in scale and diffic ult to cons truc t.Therefore,the requirements for deep foundation pit support tec hnology for subway s tations are also inc reas ing.In partic ular,in the face of complex geologic al conditions and stric t environmental requirements,it is nec essary to s elec t appropriate deep foundation pit support tec hnologies to meet the requirements of s afe and reliable construction and reasonable economic indic ators.This artic le is bas ed on the excavation of the deep foundation pit of Chengdu Metro,based on the fuzzy comprehens ive evaluation method,the AHP method to deeply analyze the deep foundation pit s upport scheme of the Provinc ial Hospital Station of the No.5 line of the metro,and optimize the cons truction method.Support program,whic h ac hieved the following results :(1)Using the analytic hierarchy process and fuzzy comprehensive evaluation method,an evaluation index system for deep foundation pit supporting schemes was constructed.Through comparative analys is,it was proposed that the supporting methods of bored cast-in-place piles + high pressure jet grouting piles with water stop and internal support are more suitable for Chengdu Metro Deep pit construction.(2)The construction process is monitored in real time.Through the analys is of monitoring data,it is conc luded that the deformation of eac h monitoring item is within the alarm value range.This proves that the exc avation construction under this supporting method is s afe and reliable,thus verifying The feas ibility of the s upport plan,provides a c ertain reference for the support and selec tion of s imilar deep foundation pits in the future.