Study on early warning of rapid sinking of large land caisson in silt layer

Large caisson constructed in the soft soil layer is prone to rapid sinking during process. Rapid often accompanied by partial sinking, which affects construction safety and subsequent construction. There no relevant early warning mechanism for of sinking. This paper takes a large land deep silt as an example, analysis through earth pressure settlement rate process, proposes mechanism. Before at edge blade feet partially plastic damaged, decreases continuously after reaching its limit value; The strain softening overlying layer, reduction side friction instability open caused gushing zone connecting are important reasons process divided into “sagging section, starting section stable section”. continuous decrease feet. When exceeds threshold value two hours, it regarded rate. Using this dual control end can effectively warn caisson.