改良剂改良砂性土路用性能试验研究

Experimental study on the way-use performance of the ameliorants improve Sandy soil

含砂土粒较多并具有一定粘性的土为砂性土,土质较松散,粒间无粘聚力。通过改良方法使砂性土保持自身优势,并减少其劣势影响,砂性土可以作为良好的路基填料来使用。通过室内试验,探究了以水泥、土凝岩分别做砂性土改良剂时,改良剂含量、浸水与无浸水养护、养护龄期、冻融循环等对砂性土抗压强度的影响。分析得出结论:改良剂改良后的砂性土在同一养护龄期条件下,随着含量增加强度显著提高;同一掺量条件下,随着养护龄期的增长,强度前期呈明显增长趋势,后期增长效果不显著;相比于同条件无浸水条件,浸水条件下强度明显提高;相比于无冻融循环条件,冻融循环条件试件强度明显降低。相对比水泥改良效果,土凝岩的改良效果较好于水泥。

The soil with sandy soil is more and has a certain viscous soil is sandy Isoil,is more loose and there is no cohesion between the particles.The sand soil can be a good subgrade filler through theway of improvingto maintain its own advantages and reduce its disadvantages.When cement and soil rock respectively are used as Sandy soilameliorants,explored that the impact of Ameliorative content、Soaking curing or not、Curing age、the freeze-thaw cycle on Sandy soil compressive strength through laboratory test.The experimental results show that The strength of improved sandy soil increases significantly with the increase of content in the same curing age condition;the strength of improved sandy soil increases obviously in the early stage,but indistinctively in the later stage;Compared with the same condition without curing in water,the strength of improved sandy soildeclines visibly under the condition of curing in water;Compared with the same condition without cycle of freezing and thawing the strength of improved sandy soilreduces clearly under the condition of cycle of freezing and thawing;Compared with the improvement of cement,the improved effect of Soil coagulation is better than that of cement.