论文部分内容阅读
根据某一高速公路塑料套管混凝土桩加固软土地基工程实例,对桩土应力、地表沉降、横向位移、不同深度孔隙水压力进行观测,讨论了塑料套管混凝土桩桩承式路堤的工作机理。结果表明:塑料套管桩加筋路堤的临界高度约为1.26倍桩净距,观测期末,荷载分担比接近89%;桩帽和桩间土最大差异沉降为30 mm左右,且应力集中比随着差异沉降的增大而线性增大;路堤堤脚附近不同深处横向位移随着路堤填筑高度的增加而增加,施工结束时,地表以下2.5 m处横向位移最大,为12.86 mm;横向位移–沉降比和横向位移增加率随着路堤填筑高度的增加逐步减小并趋于稳定,塑料套管混凝土桩加筋路堤系统能够有效防止路堤横向位移的发展和改善路堤的整体稳定性。
According to an engineering example of plastic cased concrete piles for reinforcement of soft soil foundation in a highway, the pile-soil stress, surface settlement, lateral displacement and pore-water pressure at different depths are observed. The working mechanism of plastic-cased concrete pile-supported embankment is discussed . The results show that the critical height of embankment reinforced by plastic pipe piles is about 1.26 times of the net pile spacing. At the end of the observation period, the load sharing ratio is close to 89%. The maximum differential settlement between pile caps and piles is about 30 mm, and the stress concentration ratio With the increase of differential settlement increasing linearly. The lateral displacement at different depths of embankments near the foot of embankment increased with the increase of embankment filling height. At the end of construction, the lateral displacement at 2.5 m below the surface was the largest with a lateral displacement of 12.86 mm. - The settlement ratio and the rate of increase of lateral displacement gradually decrease and tend to be stable with the increase of embankment filling height. The embankment system reinforced by plastic cased concrete piles can effectively prevent the development of embankment lateral displacement and improve the overall stability of the embankment.