双侧加宽公路路基路面的变形控制

Deformation Control of Double-side Widened Highway Subgrade Pavement

分析了双侧加宽公路路基路面变形特性与控制方法,建立了有限元分析模型,探讨了新旧路基变形特征与力学响应变化,通过参数选择,对比了台阶开挖与桩土复合地基在不同条件下的处置应用情况。建议在新旧公路台阶开挖施工中采用1∶1.25~1∶1.5高宽比,高度控制在0.8~1 m,宽度控制在1~1.5 m。在桩土复合地基处置中,需根据桩数、桩径、桩间距及桩长的影响效果进行合理控制,应布设6根桩体,将桩间距控制在2 m左右,以提升施工经济效益,达到施工要求。

The study analyzes the deformation characteristics and control methods of double-side widened highway roadbed,establishes the finite element analysis model,discusses the deformation characteristics and mechanical response changes of the old and new roadbed,and compares the treatment and application of step excavation and pile soil composite foundation under different conditions through parameter selection.It is suggested that the height ratio of 1∶1.25~1∶1.5 should be adopted in the excavation of new and old highway steps,and the height should be controlled at 0.8~1 m and the width should be controlled at 1~1.5 m.In the disposal of pile-soil composite foundation,it is necessary to reasonably control the effect of pile number,diameter,spacing and length,lay six piles,and control pile spacing at about 2 m to improve the economic benefits of construction and meet the construction requirements.