摘要
研究目的:铁路穿越不良地基时,要采取一些特殊的工程措施加以解决,以满足铁路运行要求。本文针对采动区铁路地基加固问题,对采用高压旋喷桩和水泥粉煤灰碎石桩(CFG桩)加固方案进行对比,分析CFG桩加固采动区铁路路基的优越性,为类似地基加固提供借鉴。研究结论:以某煤矿铁路专用线为例,在稳定性分析的基础上,得出了软土路堤的极限高度;在不满足路堤采动下沉加高的要求下,采用CFG桩对地基进行处理。通过复合地基承载力的理论验算和沉降量的有限元分析,以及与高压旋喷桩加固方案的对比,验证了CFG桩加固软弱地基的可行性和安全性;在软弱地基加固中,加固方案完全相同的情况下,CFG桩更具优越性;根据规范和相关文献,提出了CFG桩加固设计要求;CFG桩推广使用,对于发展废物利用、节约成本,保护环境具有积极作用。
Research purposes： Some special engineering measures must be taken for satisfying requirements of operation safety when the railway passes through the area with unfavorable geological condition. This paper discusses the problem of reinforcing the railway foundation in mining area, compares the reinforcing program of high - pressure jet grouting pile with the reinforcing program of cement fly - ash gravel pile （ CFG pile）, and analyzes the advantages of CFG pile of reinforcing the railway subgrade in mining subsidence area for providing the reference to the similar works.Research conclusions：Taking a special railway track in the coal mine as an example, on the basis of stability analysis, the limit height of soft soil embankment is obtained. In the case that the heightening requirements of the embankment under mining subsidence can not be met, the CFG pile can be used for reinforcing the subgrade. And based on the theoretical checking - calculation of the bearing capability of the composite subgrade, the comparative analysis of the settlement with finite - element method and the comparison with the reinforcing program of high - pressure jet grouting pile, the feasibility and safety of CFG pile for reinforcing soft foundation are tested and verified. The result shows the CFG pile is better for reinforcing soft foundation than the high - pressure jet grouting pile under the same conditions. According to the relative codes, the reinforcement design requirement with CFG pile is presented. The wide application CFG pile has the positive effect on making use of the wastes, saving the cost and protecting environment.
出处
《铁道工程学报》
EI
北大核心
2011年第9期45-48,共4页
Journal of Railway Engineering Society
关键词
采动区
CFG桩
地基加固
铁路路基
mining subsidence area
CFG pile
subgrade reinforcement
railway subgrade
