高铁站场中不同类型桩基沉桩顺序研究

摘要

This thesis is focus on the soil compaction effect due to pile installation There arc PHC pile、CFG pile and MMP pile in one of the Shanghai-Nanjing high-speed railway yard. With theoretical simplified method and the Ansys finite analysis program to estimate the distribution and impact ranges on stress and displacement fields of single pile.venical piles and pile groups. IT is concluded that the influences of squeezing effect of PHC pile on surrounding pile is existence. And some reasonable suggestions on construction sequence are given. The studies of this thesis may have some practical effect in engineering practice.%沪宁高铁某站场改建工程在咽喉区的狭窄区域同时出现PHC桩、CFG桩、水泥搅拌桩等多种地基处理方式,为克服PHC桩挤土效应对其他桩的可能影响.分别采用圆孔扩张理论、有限元分析方法及"等量桩"简化方法对PHC桩施工的单桩挤土效应、双桩挤土效应及群桩挤土效应进行了计算分析,获得不同条件下的挤土位移和挤土应力分布规律,进而对该区域基桩的合理施工顺序提出了建议.