The Analysis Of The Coastal Deep Excavation Seepage And Enclosure Body Stability Based On The Reliability Theory

Constructionfoundation pit is the sub-soil construction before the basement construction.In the process of deep foundation pit excavation,it is necessary to the investigation,design,construction and monitoring aimed at the specific geological condition and the foundation structure,according which to control the groundwater and foundation pit deformation.When making the foundation pit support design,it is the safety and the stability that is the most important.There are many factors that can influence the stability of foundation pit,including the soil physical and mechanical properties,natural weather conditions and engineering near the activities of people,and these factors which can through controlling the strength of the foundation pit enclosure body status,or changing the enclosure body under load,could eventually lead to instability of foundation pit.Foundation pit engineering which is near the sea because of its complicated geological conditions and the influence of tidal action,makes the stability of retaining structure problem more prominent.To ensure the stability of foundation pit retaining structure and subsequent construction safety,we must survey and analysis of its unique geological conditions and tidal influence factors such as full survey and analysis.In this paper,it is mainly based on the reliability theory,combining with the foundation pit stability analysis method,and establish Foundation pit retaining structural overall stability analysis model.First,through the analysis of coastal unconfined aquifer under the influence of the sea tidal movement of change,we can get the water level change factors;through grey correlation analysis method,and according to the practical engineering geological conditions,to research and get the main control factor on the changes of water level.Secondly,monitoring tidal water level and water level changes.According to the statistical analysis of monitoring results,combining with the results of the analysis above,to get the spatial and temporal variations of groundwater and the specific probability distribution.Third,through the foundation pit stability analysis method to establish function,according to the distribution regularity of foundation pit retaining stability influence factors to generate random sample sequences with Monte Carlo simulation;Through the stability analysis of simulation results,this paper discusses the coastal pit supporting under the condition of analysis,which can provide a reference for similar engineering later,guidance.On the basis of theoretical analysis,the purpose of this paper is to improve the foundation pit stability analysis of concrete engineering application,based on the engineering practice,theory combined with practice.