滨海软土地区隔离桩用于控制侧向堆载引起的铁路路基位移的研究

Research on Displacement of Railway Subgrade Caused by Isolation Piles Controlling Lateral Stacking Load in Coastal Soft Soil Area

福州可门港大桥货场扩建工程使铁路桥梁桩基、路基面临大面积侧向堆载问题。采用有限差分软件分析已加固滨海软土地层桩网铁路路基的侧向位移,以及隔离桩对软土侧向位移特性的影响。结果表明:未施作隔离桩时,8 m高侧向堆载引起软土层侧向位移达124 mm;采用单排隔离桩减少软土位移约15%~30%,采用双排隔离桩减少软土位移约60%~80%;当堆载高度增加时,单、双排桩隔离效果均有所降低;双排隔离桩对地层位移量及位移发展速率的控制效果均优于单排隔离桩,同时桩体自身变形量较小,稳定性较好。

Aiming at the lateral stacking load problem with large area of pile foundation and subgrade of railway bridge caused by freight yard extension project of Kemengang bridge in Fuzhou,f inite difference software was used to analyze lateral displacement of railway subgrade supported by pile net in coastal soft soil stratum and the effect of isolated piles on lateral displacement characteristics of soft soil.The results show that the horizontal displacement of soft soil caused by the 8m height lateral load stacking load is 124 mm when the isolation piles are not applied,the use of single row isolation piles reduces the displacement of soft soil by about 15%to 30%,the displacement of soft soil was reduce by 60%to 80%by using double row isolation piles,the isolation effect of single and double row piles decreases when the stacking load height increases,the control effect of double-row isolation piles on stratum displacement and displacement development rate is better than that of single-row isolation piles,the deformation of the double row isolated piles is small and the stability is better.