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中文摘要：
研究目的：水泥土搅拌桩加固软土地基能有效提高地基的承载力,减少和控制沉降量,但其强度大小及发挥程度受土质等因素影响较大。本文依托兰州至中川机场铁路建设项目水泥土搅拌桩处理饱和黄土地基工程,系统地研究和总结水泥与粉煤灰（简称“二灰”）掺入比、龄期、粉煤灰掺入量、水泥强度等级、有机质含量、搅拌均匀程度等因素对水泥搅拌饱和黄土强度特性的影响。研究结论：（1）水泥搅拌饱和黄土的强度随二灰掺入比、龄期的增大而增大,二灰掺入比从12%增加到20%,90 d龄期强度增长了0.9倍;（2）在二灰掺入总量一定的条件下,水泥搅拌饱和黄土强度随粉煤灰掺入量的增加而有所降低,粉煤灰与水泥的质量比为1∶2是比较经济合理的;（3）水泥强度等级从P.O 32.5提高到P.O 42.5,水泥搅拌饱和黄土的强度显著增长,90 d龄期时,P.O 42.5级水泥搅拌饱和黄土的强度高出P.O 32.5级水泥约40%~50%;（4）水泥搅拌饱和黄土的强度随土中有机质含量的增加而减小;（5）搅拌均匀程度对水泥搅拌饱和黄土强度的影响显著,当二灰掺入比一定时,搅拌均匀程度是影响水泥搅拌饱和黄土强度的关键因素,工程中须保证水泥搅拌土的均匀性,以提高水泥土搅拌桩加固饱和黄土地基的处理效果;（6）该研究结论可为高速铁路饱和黄土地基处理设计及施工参数选择提供依据及指导作用。
英文摘要：
Research purposes： The soft soil foundation strengthened by cement mixing pile can effectively improve the ground bearing capacity and reduce the settlement. However, the strength and behavior are greatly influenced by soil, etc. Therefore, based on the saturated loess foundation engineering with cement mixing pile of railway project for Lanzhou to Zhongchuan Airport, the factors, such as mixing ratio of cement to fly ash （ lime - fly ash）, age, fly ash incorporation, cement strength grade, organic content and mixing uniformity, which influence the strength of cement mixed saturated loess are studied. Research conclusions： （ 1 ） The strength of cement mixed saturated loess increases with the increase of lime - fly ash ratio and age, and the strength of 90 d age increases by 0.9 times when the lime -fly ash ratio increases from 12% to 20%. （2）In the certain total incorporation, the strength of cement mixed saturated loess decreases with increase of fly ash, and the rational and economical ratio of fly ash to cement is 1 ： 2. （3）The strength of cement mixed saturated loess increases significantly when the strength of cement is rated from P. O 32.5 to P. O 42.5, and for 90 d age, the strength of saturated loess mixed with cement P. O 42.5 is superior to cement P. O 32.5 by 40% to 50%. （4） The strength of cement mixed saturated loess decreases with the increase of organic content in soil. （5） The mixing uniformity influences the strength of cement mixed saturated loess significantly, especially in the certain incorporation of lime - fly ash, thus the uniformity of cement mixed loess must be ensured so as to reinforce the saturated loess foundation by cement mixing pile. （6） The research conclusions can provide basis and reference for design and parameter selection of saturated loess foundation construction of express railway.
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