摘要近几年，我国高速铁路事业进展迅速，遇到得不良地质也越来越多，尤其就是软土地基，软土地基得沉降很难控制，高速铁路对沉降要求相当严格。本课题采纳水泥土搅拌法对高速铁路经过得软土地段进行地基加固方案设计。首先，根据设计资料通过瑞典条分法进行天然地基路堤稳定性分析，其安全系数不满足要求，需要进行地基加固。然后对水泥土搅拌桩得桩长、桩径、桩距、布桩方式进行设计；确定桩身选用水泥标号、水灰比与外加剂得用量；计算搅拌桩得单桩承载力与复合地基承载力；为了快速准确地找到地基加固后路堤得最危险滑动面，用理正软件辅助寻找，并用瑞典条分法计算其稳定性安全系数；最后用复合模量法计算搅拌桩加固体得压缩变形与桩端下未加固土层得压缩变形。关键词：高速铁路；软土地基；地基加固；水泥土搅拌桩AbstractIn recent years, the rapid development of high-speed railway in China has encountered more and more bad geology, especially the soft soil foundation、Soft soil foundation settlement is difficult to control, high-speed railway on the settlement requirements are quite strict、In this paper, thecement mixingmethod is adopted to design the foundation reinforcement of the soft soil section passing through the high speed railway、First of all, according to design data, through the Swedish strip method to analyze the stability of the embankment on the natural foundation,Its safety factor does not meet the requirements, the foundation reinforcement needs to be achieved、Then the pile length, pile diameter, pile distance and pile way of cement soil mixing pile are designed、Determine the pile selection of cement grades, water-cement ratio and the amount of admixture、Calculate the bearing capacity of single pile and the bearing capacity of composite foundation、In order to quickly and accurately find the most dangerous sliding surface of the embankment after the foundation reinforcement ,with Lizheng software assisted search,and its stability fact...
