Assessment of the Impact of Road Construction on Soft Ground on the Displacement of Existing Pipelines

Aiming at a municipal pipeline adjacent to a soft soil roadbed treatment project in Guangzhou, a three-dimensional finite element model of pipeline and strata was established to analyze the influence of different construction conditions on the displacement of adjacent gas pipelines under roadbed treatment of deep soft soil layer in coastal South China.The research results show that:(1) The use of isolation piles for protection can effectively reduce the vertical displacement of pipelines.The effect on pipeline horizontal displacement is small.(2) When the horizontal distance between the pipeline and the construction roadbed is greater than 50m, no pipeline protection measures can be taken.(3) The horizontal distance between the pipeline and the construction roadbed is 10~30m, and the protection measures of CFG pile reinforcement are adopted; When the horizontal distance is 30 to 40m, use the protective measures of inserting plastic drainage plates and mixing piles.When the horizontal distance is 40to 50m, use the protective measures of inserting plastic drainage plates.It can be seen that the soft foundation road construction has a greater impact on the vertical displacement of the existing pipeline, and a smaller impact on the horizontal displacement.Some protective measures should be taken before construction to provide guarantee for the normal use of the existing pipeline.