基于ABAQUS的土工格栅和水泥搅拌桩复合地基加固研究

Study on Composite Foundation Reinforcement of Geogrid and Cement Mixing Pile Based on ABAQUS

在城市道路建设过程中通常会遇到各种不同的地质情况,软土地基是常见的地质问题之一,城市道路的路基是路面的基础应满足强度、变形和稳定性的要求;由于软土具有天然含水量大、压缩性高、承载力低和抗剪强度很低等特点,当采用软土作为路基基础时,应采取各类地基加固处理措施来对软土地基进行处理使得城市道路满足设计的要求。以长沙经开区党校路(东六路—福祥路)为案例,针对采用土工格栅和水泥搅拌桩加固软土形成复合地基的工况,运用ABAQUS建立了相应的数值模型模拟未施加加固措施和施加土工格栅结合水泥搅拌桩复合加固措施的情况,并以竖向沉降、水平位移、竖向应力三个指标进行了复合地基加固性能的规律对比分析,研究结论对城市道路软土地基处理起到很好的指导作用。

In the process of urban road construction,various geological conditions are usually encountered.The soft soil foundation is one of the common geological problems.The subgrade of urban road is the foundation of pavement and should meet the requirements of strength,deformation and stability.Because the soft soil has the characteristics of large natural water content,high compressibility,low bearing capacity and low shear strength,when the soft soil is used as subgrade foundation,various foundation reinforcement measures should be taken to treat the soft soil foundation to make the urban road meet the design requirements.Taking Dangxiao Road(Dongliu Road-Fuxiang Road)in Changsha Economic Development Zone as an example,the corresponding numerical model is established with ABAQUS to simulate the working conditions of not using the reinforcement measures and using the reinforcement measures of geogrid combined with cement mixing pile aiming at the working condition of using geogrid and cement mixing pile to reinforce the soft soil to form a composite foundation.According to three indexes of vertical settlement,horizontal displacement and vertical stress,the law of reinforcement performance of composite foundation is analyzed.The research conclusion plays a good guiding role in soft soil foundation treatment of urban road.