冲击碾压在城市道路湿陷性黄土路基处理中的应用研究

Study on Application of Impact Compaction in Treatment of Collapsible Loess Subgrade of Urban Road

摘要:

为了研究冲击碾压对城市道路湿陷性黄土路基的处理效果，针对甘肃国际陆港中心区道路建设场地湿陷性黄土特点，设计了湿陷性黄土路基冲击碾压处理方案，采用土体沉降量、压实度、湿陷系数、压缩模量等参数表征处理效果，研究不同冲击碾压遍数下路基不同深度范围的土体处理效果。结果表明:冲击碾压能够有效改善湿陷性黄土路基压实度、压缩模量、湿陷性，冲击碾压25遍后深度为80 cm的黄土湿陷性完全消除；冲击碾压对150 cm范围内的湿陷性黄土压实度提高效果显著，冲击碾压对湿陷性黄土的有效处理深度为1.5 m。

Abstract:

In order to study the treatment effect of impact compaction on the collapsible loess subgrade of urban roads, aiming at the characteristics of collapsible loess in the road construction site of Gansu International Inland Port Center, the treatment scheme of collapsible loess subgrade by impact compaction is designed. The soil settlement, compaction degree, collapse coefficient, compressive modulus and other parameters are used to characterize the treatment effects. The effects of soil treatment of subgrade in the different depth ranges under the different impact compaction cycles are studied. The results show that the impact compaction can effectively improve the compaction degree, compression modulus and collapsibility of collapsible loess subgrade. The loess collapsibility at a depth of 80 cm is completely eliminated after 25 times of impact compaction. The impact compaction has a significant effect on improving the compactness of collapsible loess within 150 cm. The effective treatment depth of impact compaction on collapsible loess is 1.5 m.