摘要
以杭州某车辆段的大面积石灰改良土路基填料工程为例,阐述了石灰土作为路基替代填料的优缺点;并分析了含水量、石灰剂量等对于改良水灰土强度的影响规律,确定了相应技术参数。研究表明在淤泥质土质情况下最优石灰掺量比为8%,能达到较好加固效果的同时也比较经济。石灰土压实最佳含水量为17.0%,随着石灰土拌和次数的增加,其含水量不断减少,施工时含水量应稍高于其最佳含水量,杭州地区因水系丰富且气候潮湿,拌和含水量高1%。施工完成后,在饱水情况下石灰土含水量在1 d内达到饱和,且其强度减少近56%,石灰土路基防水工作对保证路基服役性能至关重要。本文研究成果可为类似工程的质量控制提供借鉴。
Taking a large-area lime-improved soil roadbed filling project in a vehicle depot in Hangzhou as an example,the advantages and disadvantages of lime-soil as substitute filling for roadbed are expounded.The influence of water content,and lime dosage on the strength of improved water-lime soil are analyzed,and the corresponding technical parameters are determined.The study shows that the optimal lime content ratio is 8% in the case of silty soil,which can be the most beneficial and economical lime content.The optimal water content for the lime-treated soil is 17%,and the water content decreases with the mixing times.Thus,the water content in lime-treated soil is chosen as 1% higher than the optimum water content considering the rich water system and humid climate in Hangzhou area.Experimental results show that the strength of the lime-treated road base would be reduced by nearly 56% once saturated by water.Thus,the water-proof for the limetreated road base would be crucial for its long-term behavior.The research results of this paper can supply guidelines for the quality control of lime-treated road base fillings in similar projects.
作者
李聪
LI Cong(China Railway 16th Bureau Group Beijing Metro Engineering Construction Co.,Ltd.,Beijing 101100,China)
出处
《地基处理》
2021年第1期34-38,共5页
Journal of Ground Improvement
