湿陷性黄土地区水泥土挤密桩改扩建路基沉降特性研究

Study on settlement characteristic of cement-soil compaction pile reconstruction and expansion subgrade in collapsible loess area

京新高速新疆境内大黄山至乌鲁木齐段改扩建工程中利用水泥土挤密桩加固新建路基,利用Midas GTS NX有限元软件研究了新建路基填筑过程中水泥土挤密桩桩径、桩长及桩间距的不同对原路基沉降特性的影响。综合分析桩径、桩长及桩间距对道路沉降的影响,表明桩长6m,桩径0.4m,桩间距0.8m的水泥土挤密桩处治地基较为合理。

Cement-soil compaction piles are used to reinforce new subgrade in the reconstruction and expansion project of Dahuangshan-Urumqi section of Xinjing expressway.The influence of diameter,length and spacing of cement-soil compaction piles on settlement characteristics of original subgrade during the filling process of new subgrade is studied by using Midas GTS NX finite element software.The treatment of the foundation by cement-soil compaction pile with 6 m pile length,0.4 m pile diameter and 0.8 m pile spacing is more reasonable by considering the influence of pile diameter,pile length and pile spacing on the settlement of the subgrade and the economic factors.