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为了考察路堤荷载作用下桩网结构路基桩土间的荷载分担与传递、垫层筋带拉力的组成与分布,选择某新建铁路桩网结构路基试验工点进行了现场试验,测试了地基变形、路堤基底压力、孔隙水压力、桩身轴力和格栅拉力等数据。测试数据表明:①地基沉降以压密下沉为主,路基结构稳定,软土较厚一侧地基变形较大;②当桩、土间沉降差与桩间净距的比值为5.93%时,土拱效应完全发挥,之后增加的路堤荷载完全由桩承担;③桩间土竖向附加应力在加固区内沿深度呈K型分布;④筋带拉力沿路基横向呈M型分布,软土较厚一侧拉力较大;⑤筋带拉力由路堤荷载作用下的桩间筋带张力与路堤横向滑移引起的筋带拉力两部分组成,设计筋带时二者均需考虑。
In order to investigate the composition and distribution of the load sharing and transmission between the pile and soil in the pile-soil subgrade under the embankment load and the tensile force of the cushion in the pile foundation, a field test was carried out on the test site of a new railway pile- Embankment base pressure, pore water pressure, axial force of the pile and grid tension data. The test data shows that: ①the foundation settlement is mainly dense and subsidence, the subgrade structure is stable, and the deformation of the foundation on the thicker side of soft soil is larger; ② when the ratio of pile subsidence difference and net spacing between piles is 5.93% Soil arching effect fully exerted, and then increase the embankment load entirely by the pile bear; ③ vertical additional stress between the soil in the reinforcement zone along the depth of the K-type distribution; ④ tension along the embankment was M-type distribution of soft soil The tension on the thick side is larger; ⑤ The tensile force of the tendons is composed of the tension between the tendons under the embankment load and the tendon tension caused by the lateral slip of the embankment. Both should be considered when designing the tendons.