高速客运专线天然黄土地基工后沉降数值模拟

湿陷性黄土是一种十分特殊的土质,俗称大孔土,具有较大的孔隙率和偏低的干密度。在自重压力和土的附加压力共同作用下,受水浸湿时将发生急剧而大量的附加下沉现象。结合郑西客运专线天然黄土地基工后沉降,用分层总和法和平面有限元方法对天然黄土地基工后沉降进行了分析研究,计算了当黄土层厚度为8 m、12 m、15 m,路堤高度为4、6、8 m时,不同天然黄土地基模量下地基的工后沉降量。并于三种工后沉降控制标准进行了分析比较,得出了一些有益的结论,为工程设计和施工提供参考。

Post-construction settlement numerical simulation of natural loess foundation on high-speed passenger special line

Collapsible loess usually called macroporous soil is a kind of very special soil,which has bigger porosity and lower dry density.And under the combined action of gravity pressure and additional pressure of soil,it will sink suddenly and abundantly.Combined with post-construction settlement of natural loess foundation on Zhenzhou to Xi’an passenger special line,post-construction settlement of natural loess foundation with layer wise summation method and H-version finite element scheme and respectively calculates the post-construction settlements of loess foundation with different modules is researched when the thickness of loess foundation are 8 m,12 m or 15 m and the height of embankment correspond to 4 m、6 m or 8 m.Then it comparatively analyzes three settlement control standards and obtains some beneficial conclusions,which can provide a reference for engineering design and construction.