Abstract:Taking the construction of the stormwater drainage box culvert along the coast as an example,this paper discusses the problems of high tide water erosion and foundation pit protection in the construction of coastal rainwater drainage box culverts based on on-site practice.During the construction of the stormwater drainage box culvert,the dual safety hazards of the coastal slope being eroded by high tide water and the instability of the deep foundation pit slope on the land side are addressed.Through on-site investigation and review of tidal data,the anti-erosion measures such as “stacking accropode+sandbag cofferdam” and the protection measures such as “Larsen sheet pile+staged slope excavation” are taken according to local conditions for the onshore foundation pit.Through on-site construction control and relevant measurements,the total settlement after excavation of the foundation pit is controlled within 60 mm,and the outlet section of the box culvert is completed 8 d ahead of the planned node schedule.At the same time,the construction cost of driving 50 t of sheet piles is saved.The above measures effectively ensure the stability and safety of the foundation pit during the construction of the coastal stormwater drainage box culvert,and the construction progress and cost of the measures have reached the expected goals,providing certain reference value for similar projects.
