The consolidation fast shear test is an important method to obtain the consolidation and undrained shear strength of soft soil,and the soft soil of the Yangtze floodplain has the characteristics of high compressibility,large pore ratio,high moisture con-tent,low permeability,and long consolidation time,which seriously affects the production efficiency of soft soil consolidation fast shear test.To study the effect of preconsolidation on the shear strength of the Yangtze River floodplain facies soft soil and explore the method to improve the efficiency of fast shear tests for consolidation of floodplain soft soil,a series of consolidation and shear tests were carried out,taking the Nanjing Yangtze River floodplain soft soil as the research object.The results show that the Yangtze River floodplain facies soft soil is a kind of soft soil with rapid consolidation in the early stage and stable and slow consolidation in the later stage.The consolidation degree can reach 95%when consolidating for 25 minutes,while it takes 5～8 hours to fully consolidate and stabilize.The shear strength of soft soil increased with the increase of consolidation degree U,and its growth rate gradually slowed down.The increase of shear strength with the increase of U under each load condition was basically the same.When the degree of con-solidation is 70%～80%,its shear strength reaches 90%～95%of that when fully consolidated.This study can provide a reference for improving the fast shear test method of soft soil consolidation.
关键词
漫滩相软土/预固结/固结度/固结时间/抗剪强度
Key words
floodplain facies soft soil/preconsolidation/degree of consolidation/consolidation time/shear strength
维普
万方数据