摘要
以实际工程为依托,通过室内试验和现场检测,对石灰改良黄土的物理性质、强度特性、水稳定性和干湿循环下其强度变化规律进行了研究.研究结果表明:石灰改良土的塑性指数显著降低,亲水性减弱;随掺灰量的增加,石灰改良黄土含水率的控制范围变宽;石灰改良土的抗剪强度特性随压实系数的增加而增大;石灰改良土的压缩系数随压实系数的增加、掺合比的增加及龄期的增长而逐渐降低,属于低压缩性土;石灰改良土具有良好的水稳定性、强度特性和龄期效应,且具有良好的抵抗干湿循环后强度降低的特性;石灰改良土的抗剪强度在1次干湿循环后有所衰减,但随着干湿循环次数的增加,石灰改良土的黏聚力随循环次数的增加而逐渐增大,其强度也显著增大.现场压实质量检测结果表明,石灰改良土路基质量能很好的满足设计规范要求.
Based on the railway embankment engineering and through the in-door laboratory and in-site testing,the physical properties,strength properties,water stability and its strength in wet and dry cycles of the lime-stabilized loess are studied.The result shows that the plasticity index of the lime-stabilized soil significantly reduces and its hydrophilicity declines;the control range of moisture of the lime-stabilized loess becomes wider with the increase in the amount of mixing lime;the shear strength characteristic improves with the increase of the compaction factor;the compression coefficient of the lime-stabilized soil decreases with the increase of compaction factor,the mixture ratio and the growth of age,so it is low compressive soil;the lime-stabilized soil possesses favorable water stability（water stability index is greater than 0.7）,strength characteristics and effects of age,and it has good resistance to reduce the strength characteristics after the wet and dry cycle;the shear strength of the lime-stabilized soil declines after a wet and dry cycle,but it increases with the addition of the cycle times,its cohesion improves with the addition of the cycle times,too,and so does its strength.The in-site detecting result of compaction indicates that the quality of embankment filled with the lime-stabilized loess meets the need of design perfectly.
出处
《兰州交通大学学报》
CAS
2011年第6期12-15,19,共5页
Journal of Lanzhou Jiaotong University
关键词
客运专线
黄土路基
抗剪强度
石灰
压实质量
passenger dedicated line
loess embankment
shear strength
lime
compaction quality
