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| Experimental Research on the Factors Influencing Strength of Cement Mixed Saturated Loss |
| YANG You - hai1，LIU Yong - he1，REN Xin2 |
| (1. Lanzhou Jiaotong University，Lanzhou， Gansu 730070，China; 2. Lanzhou Railway Bureau，Lanzhou， Gansu 730000，China) |
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Abstract 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 loss 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 loss are studied. Research conclusions :( 1 ) The strength of cement mixed saturated loss 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 loss 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 loss 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 loss 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 loss significantly, especially in the certain incorporation of lime - fly ash, thus the uniformity of cement mixed loss must be ensured so as to reinforce the saturated loss foundation by cement mixing pile. (6) The research conclusions can provide basis and reference for design and parameter selection of saturated loss foundation construction of express railway.
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Received: 28 August 2015
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2016, Vol. 33 
