Monitoring andanalysis of water and soil pressure on diaphragm wall during excavation of deep foundation pit

Aiming at the safety problem of deep foundation pit engineering in the development of urban underground space, the change of water and soil stress caused by the construction of underground continuous walls is taken as the research object. Through theoretical analysis and field monitoring data comparison, the calculation method and actual deformation law of soil pressure of foundation pit retaining structure are discussed. It is found that the monitoring value of water and soil pressure of the diaphragm wall can effectively reflect the actual stress state of the foundation pit retaining structure. In this deep foundation pit project, the use of shovel-shaped stratum stress monitoring devices enables the observation of soil and water pressure variations both within and outside the pit during the excavation process. This data is then evaluated against the values calculated during the design phase for comparison. The results show that the designed earth pressure of the foundation pit under the static state is consistent with the measured value, and the monitoring value of the earth pressure during the excavation process is smaller than the theoretical calculation value, which is related to the wall displacement and groundwater seepage. This study has certain guiding significance for studying the deformation law of foundation pit based on field monitoring data, to optimize the design scheme.