Taking a newly-built railway project as an example,based on finite element software,the depth of cast-in-place bored pile embedded in bedrock(5 pieces of depth data)and the size of reinforcement range by rotary jet grouting pile in the front(6 pieces of row numbers for reinforcement)were taken as the control variables to study the mechanical properties of the pile foundation and the settlement of the subgrade surface.The results show that,the maximum horizontal stress of the cast-in-place pile foundation appears near the soil-rock interface,and increasing the rock-socketed depth of pile foundation and the row number of jet grouting pile in the front can effectively reduce the horizontal deformation of the pile foundation and the settlement of the subgrade surface.When the rock-socketed depth of the pile foundation is 1D(D is the diameter of cast-in-place pile)or the row number of jet grouting pile in the front is 3,the change rate appears an inflection point from fast to slow.The pile foundation length is 16 m and the jet grouting pile in the front is 3 rows,which has good economy.
关键词
深厚软土/桩基托梁结构/嵌岩深度/位移监测/路基沉降/经济性
Key words
deep soft soil/pile foundation joist structure/rock-socketed depth/displacement monitoring/subgrade settlement/economy
维普
万方数据