黄河冲（淤）积粉质二灰土的配合比研究

试验研究了黄河冲（淤）积粉质二灰土的配合比问题。分析了黄河冲（淤）积粉质二灰土的强度标准龄期；研究了土质、二灰比、二灰含量对二灰土强度的影响规律；提出了黄河冲（淤）积粉质二灰土配合比设计的新思路。研究认为，对于黄河冲（淤）积粉质二灰土，应以21 d无侧限抗压强度作为配合比设计的依据；黄河冲（淤）积平原区土质适宜的二灰比为1：3，适宜的二灰含量在32 %～40 %之间；土中<0.005 mm颗粒含量、土的有机质含量，以及二灰土的粗细颗粒比Cf值对黄河冲（淤）积粉质二灰土的强度具有重要影响，且呈现规律性变化；当土中<0.005 mm颗粒含量在17 %～27 %之间时，黄河冲（淤）积粉质二灰土可获得较高的强度。

Mixture ratio of Yellow River silty soil stabilized with lime-fly ash

Through the experiment, the mixture ratio of Yellow River alleviation (silting) soil stabilized by lime-fly ash is studied. The standard age of strength of Yellow River alleviation (silting) soil stabilized by lime-fly ash is analyzed. The influence law of soil and lime-fly ash ratio and content to the strength of lime-fly ash soil is studied; and the new idea about mix design of Yellow River alleviation (silting) soil stabilized by lime-fly ash is put forward. Research thought that the mix design should be based on the 21 d unconfined compression test of Yellow River alleviation (silting) soil stabilized by lime-fly ash, is put forward. The most suitable lime-fly ash ratio of Yellow River alluvial plain soil is 1: 3, and the most suitable lime-fly ash content is between 30 % and 40 %. The grain content of <0.005 mm and organic matter content and thickness ratio can influence the strength of Yellow River alleviation (silting) soil stabilized by lime-fly ash obviously; and the interrelation among them is regular. When the grain content of <0.005 mm is between 17 % and 27 %, the Yellow River alleviation (silting) soil stabilized by lime-fly ash can obtain higher strength.