Research On Application Of Automatic Health Monitoring Technology For Deep Foundation Pit Of Rail Transit In Coastal Area

In recent years,the construction of urban rail transit in coastal area is developing rapidly in China.The foundation pit of urban rail transit in coastal area has the typical characteristics of large embedded depth of supporting structure,complex surrounding environment,complex construction process of internal support,and changeable hydro-geological parameters.The stability of foundation pit and the protection of surrounding environment become the key issues of foundation pit design and construction,and deformation control plays a decisive role.Affected by many factors,such as geotechnical characteristics,exterior load,groundwater,construction organization and so on,deformation of deep foundation pit in coastal area is a complex geotechnical engineering problem.The research on deformation monitoring of deep foundation pit is of great value to the safety construction of urban rail transit.Especially,it is necessary to establish a set of integrated automatic health monitoring and forewarning management technology combining with the characteristics of deep foundation pit in coastal area.Based on the existing application of monitoring and forewarning technology of some urban rail transit,combined with the automatic monitoring data evaluation of the foundation pit,the exploration of application research on the automatic health monitoring technology of the deep foundation pit in coastal area is carried out by using geotechnical engineering expert system.This paper introduces the monitoring methods and contents of the deep foundation pit in coastal area and summarizes the types,characteristics and inducements of the disaster of the foundation pit in coastal area.All-weather data acquisition,data transmission and deformation data preliminary judgment are provided by adding the intelligent monitoring equipment.Combined with the factors of deep foundation pit,such as geological conditions,hydrological conditions and supporting engineering design,construction organization,numerical comparison simulation,foundation pit health judgment,diagnosis and forewarning are in progress by adding the intelligent expert evaluation system.The system effectively combines the geological conditions,hydrological conditions and construction process organization,achieves mutual verification of deformation and timely correction of hydro-geological parameters,which has a good guiding role in ensuring the safe construction of deep foundation pit.The research results provide technical support for the design,construction,deformation control and health warning of deep foundation pit of urban rail transit in coastal area,and provide some practical references for the construction of urban deep foundation pit of urban rail transit in coastal area.