水泥改良黄土状土的试验研究  

Experiment on improved loess soil by cement

作　　者：闫爱军[1] 

机构地区：[1]杨凌职业技术学院,陕西杨凌712100

出　　处：《水资源与水工程学报》2015年第5期225-228,共4页Journal of Water Resources and Water Engineering

基　　金：杨凌职业技术学院人文社科类基金项目(GJ1408)

摘　　要：为探索小区域黄土状土,通过水泥改良之后的可靠性以及适用性对杨凌土场的黄土状土在实验室掺和4%、5%、6%、7%、8%的42.5号水泥,借助于液塑限试验、击实试验以及快速直剪试验3种常规土工试验方法,研究了5种不同掺和比水泥改良黄土状土的物理状态指标、最优含水、最大干密度以及抗剪强度指标,进一步分析了水泥改良土物理状态指标。结果表明:掺和水泥能够较好地改善土的物理性状;同时,水泥掺和比、龄期等因素对水泥改良土强度指标c值影响巨大,内聚力c并随掺合比的增大而增大。试验结果对实际工程项目采用水泥改良技术具有实际意义和参考价值。To explore loess soil of little area , the paper discussed the loess soil of Yangling soil field mixed with No .42 .5 cement of 4%, 5%, 6%, 7%and 8%in laboratory through improving the relia-bility and applicability of soil by cement .With the help of three kinds of conventional soil test methods such as liquid plastic limit test , compaction test and direct shear test , the paper studied the physical state index, optimal water content, maximum dry density and shear strength index of the loess soil improved by cement with five different mixing ratios , and then further analyzed the physical state index of improved soil.The result shows that the cement admixture can better improve the physical properties of loess soil . At the same time , the factors such as mixing ratio and age period of cement can greatly impact C value of strength index of loess soil while the cohesive force will increase with the enhance of cement blending rati -o.The results have practical significance and reference value for the actual project of loess soil in yan-gling demonstration zone when the cement improved technology is applied .

关 键 词：水泥改良土 液塑限试验 击实试验 直剪试验 强度指标 

分 类 号：TU411[建筑科学—岩土工程]