Analysis of influence of reserved soil embankment on mechanical properties of deep foundation pit
The reserved soil embankment is widely used in the support of foundation pit,but the design calculation is often based on experience,which has certain blindness and uncertainty.Based on the constructing project,a numerical analysis model was established by using FLAC3D.By changing the height and width of the reserved soil embankment,the variation laws of horizontal displacement of foundation pit support pile,surface settlement around the foundation pit,pile bending moment,safety factor and potential sliding surface were studied.Finally,economic and reasonable design parameters of the reserved soil embankment were proposed.The results show that the maximum displacement of foundation pit support pile occurs at the top of the pile,the surface settlement around the foundation pit presents a"groove"distribution,and the maximum settlement is 2-3 m away from the edge of the foundation pit.The bending moment of the pile body shows a"bulge shape"variation rule along the pile length,and the peak point is 8-12 m away from the pile bottom.The design width of the reserved soil embankment in front of the pile should not be more than 8 m,otherwise it will have little benefit to reducing the displacement and bending moment of the support pile and the surface settlement around the foundation pit,and will occupy the limited construction surface of the foundation pit.The height of the reserved soil embankment in front of the pile should not be more than 5 m,otherwise its stability will be difficult to ensure.
fine silty sand groundfoundation pitreserved soil embankmentmechanical propertynumerical simulation
NETL
NSTL
万方数据
维普
