基于高速铁路软土路基固结沉降有限元分析

Finite-element Analysis based on Soft soil Subgrade Consolidation Settlement of High-speed Railway

利用大型有限元软件ABAQUS,结合工程实例分析了软土路基分步修筑固结沉降的变形特性。计算结果表明:在路基分步填筑过程中,填土加载引起内部孔隙急剧变化,水体流失产生附加应力导致路基沉降。因此,施工中通过控制填土的速度来减小路基沉降是提高路基修筑质量的一个重要手段。同时,该标段结合实际情况,采用"旋喷桩和土工栅格"的加固方法,通过路基施工后沉降观测数据来看,效果明显。

Combined with engineering projects,the deformation characteristics of step-by-step building consolidation settlement of soft soil subgrade is analyzed by means of large finite element software ABAQUS.The calculation result indicates that： during the process of foundation filling step by step,the filling loading causes a rapid change of the internal pore.Subsidiary stress resulting from water erosion results in subgrade settlement.Therefore,to reduce subgrade settlement by controlling filling speed is an important method to improve subgrade building quality.Meanwhile,combined with the actual condition,this bidding segment adopts reinforcement method of ＂Jet grouting pile and Geotechnical grid＂,which has an obvious effect through the settlement observation data after subgrade construction.