Shaking Table Test of Composite Foundation Reinforcement of Saturated Silty Soil Ground for High Speed Railway
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摘要: 在研制大型堆叠式剪切模型箱的基础上,以京沪高速铁路饱和粉土地基加固为背景,对饱和粉土地基、碎石桩桩网结构地基和水泥粉煤灰碎石桩(CFG桩)桩网结构地基加固进行了大型振动台模型试验研究,模型几何相似比为1:10.研究表明,碎石桩桩网结构地基能够有效地抑制超静孔隙水压力上升,从而提高地基抗液化的能力;碎石桩桩网结构地基和CFG桩桩网结构地基均能够较大地减小地基剪切位移,从而提高地基抗剪切变形的能力;这2种桩网结构地基均较大地减小了由于地基液化引起的响应加速度的放大作用,能有效地减小路堤和地基在地震条件下的沉降及不均匀沉降,提高路基的整体抗震性能.
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关键词:
- 饱和粉土 /
- 液化 /
- 大型振动台模型试验 /
- 碎石桩桩网结构地基 /
- CFG桩桩网结构地基
Abstract: Three shaking table model tests were conducted with a geometrical scale of 1:10 using a large-scale laminar shear box to investigate the reinforcement effects of compacted gravel column-net composite foundation and cement fly-ash gravel (CFG)column-net composite foundation on the saturated silty soil ground along the Beijing-Shanghai high speed railway.The research results indicate that the increase of excess pore water pressure can be restrained effectively by the compacted gravel column-net composite foundation to improve the anti-liquefaction ability of ground,and that shear displacement of ground can be reduced greatly by the compacted gravel column-net and CFG column-net composite foundations to improve the anti-shear displacement ability of ground.Furthermore,the amplifying of response acceleration,induced by foundation liquefaction,and the settlement of foundation and subgrade can be reduced greatly by the compacted gravel column-net and CFG column-net composite foundations to improve the aseismatic property of foundation and subgrade. -
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