首页> 中文期刊> 《兰州理工大学学报》 >软弱地基上高填方路堤沉降观测及数值分析

软弱地基上高填方路堤沉降观测及数值分析

         

摘要

On the basis of an actual high filled embankment construction, the settlement law of such embankment on soft foundation was investigated. The field test of original ground surface settlement, layered settlement and horizontal displacement was conducted and the effect of different filling height on foundation deformation was analyzed with finite element software. The result showed that right after completion of embankment filling, the settlement was 44. 6 cm in embankment center and 32. 5 cm at road shoulder. After six months of completion of the filling, the embankment settlement tended to be stable, which was 59. 5 cm and 47. 8 cm, respectively, and the post-construction settlement accounted for 25% and 32% of the total settlement respectively. In embankment filling process, soft soil of subgrade was extruded outward, the maximal displacement being 22. 4 cm at the depth of 2-4 m under the ground. Numerical calculation result was different from that of actual measurement to some extent. However, their pattern was consistent and the difference was not great.%为研究软弱地基上高填方路堤沉降规律,依托某高填方路堤填筑的工程实际,现场测试原地表沉降量、分层沉降量和地表水平位移,并利用有限元软件分析不同填筑高度对地基变形的影响.结果表明:在路堤填土完成后,路堤中心沉降量为44.6 cm,路肩处为32.5 cm;填土完成后6个月,路堤沉降趋于稳定,沉降分别为59.5 cm和47.8 cm;工后沉降占沉降的比例分别为25%和32%.路堤填筑过程中,地基软弱土体向外挤出,最大位移发生在地表以下2~4 m处,为22.4 cm.数值计算结果和实测结果数值上有所差异,但规律一致且差别不大.

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