CAJ | 학술논문

研究目的：不良地质环境条件下路基工后沉降的控制是高速铁路设计中的关键问题，过大的路基工后沉降会对高速铁路的运营产生不良影响。本文以武广高速铁路武汉综合试验段为例，运用有限元法对软土段采用 CFG 桩复合地基处理后的沉降特征进行研究。研究结论：（1）随着路堤填筑高度的逐渐增加，路堤高度越大其沉降量越大，复合地基 CFG 桩端沉降量随距路堤中心距离增加而减小，且在路堤顶面宽度以外快速衰减；（2）CFG 桩与填土应力比随路堤填筑高度的增加而减小，桩土所承担的荷载分布更加均匀，桩土应力比随距路堤中心的距离增大而增大，路堤中心处桩土受力更均匀；（3）孔隙水压力随填筑高度增加而迅速增长，加载完成后便开始逐渐消散，路堤填土一年后，路堤中心处的孔压基本扩散均匀，约为38 kPa；（4）该研究成果可为高速铁路软土复合地基沉降控制提供参考。
연구목적：불량지질배경조건하로기공후침강적공제시고속철로설계중적관건문제，과대적로기공후침강회대고속철로적운영산생불량영향。본문이무엄고속철로무한종합시험단위례，운용유한원법대연토단채용 CFG 장복합지기처리후적침강특정진행연구。연구결론：（1）수착로제전축고도적축점증가，로제고도월대기침강량월대，복합지기 CFG 장단침강량수거로제중심거리증가이감소，차재로제정면관도이외쾌속쇠감；（2）CFG 장여전토응력비수로제전축고도적증가이감소，장토소승담적하재분포경가균균，장토응력비수거로제중심적거리증대이증대，로제중심처장토수력경균균；（3）공극수압력수전축고도증가이신속증장，가재완성후편개시축점소산，로제전토일년후，로제중심처적공압기본확산균균，약위38 kPa；（4）해연구성과가위고속철로연토복합지기침강공제제공삼고。
Research purposes:Control of post construction settlement under poor geological condition is the key issue in high -speed railway design.The greater post construction settlement will have bad effects on the operation of high -speed railway.Using finite element method (FEM),this paper studies on the CFG pile composite foundation treatment of the soft soil subgrade settlement properties of the high -speed,as an example of Wuhan comprehensive test section of Wuhan -Guangzhou high -speed railway. Research conclusions:The result shows that:(1 )The settlement amount gradually increases with the enhancing of height of the embankment.The settlement amount of composite foundation of CFG pile end decreases with the increasing of distance from the center of embankment,and rapidly decays in the outside of the top width of the subgrade.(2)The stress ratio between CFG pile and soil decreases with the increasing of the height of embankment,the load is becoming more uniform of CFG pile and soil.The stress ratio of CFG pile and soil increases with the distance from the center of embankment,embankment center's force of piles and soil are more uniform.(3)Subgrade pore water pressure increases rapidly accompanied with the increase of embankment height,and begins to dissipate after completion of loading process.A year after the subgrade construction,embankment center pore water pressure almost spreads evenly,and its number is about 38 kPa.(4)The research result can provide a reference for the settlement control of soft soil composite foundation of high -speed railway.