石灰加固软土路基效果的试验研究  

Experimental Study on the Effect of Lime Strengthening Soft Soil Subgrade

作　　者：白晓明 Bai Xiaoming

机构地区：[1]中铁十八局集团有限公司天津国际工程公司,天津300222

出　　处：《辽宁省交通高等专科学校学报》2023年第4期17-21,共5页Journal of Liaoning Provincial College of Communications

摘　　要：过量添加石灰对软土进行改良会对生态环境造成一定的影响,为避免软土改良过程中的环境污染,本研究以贡贝州库达公路工程为研究对象,开展室内试验,分析生物酶、石灰共同作用的固化改良软土路基的效果,分析其固化机理,得出以下结论:生物酶和石灰度软土进行固化能有效提升土体的强度,生物酶对石灰的固化具有一定的促进效果,对比仅使用石灰固化的试样可得,生物酶、石灰共同作用下的CBR强度最高可提升4%;其中,固化剂对高岭土的强度提升效果最为显著,其最大应力可达到5236kPa,相较于生物酶固化土样提升了2.87倍。生物酶可使土颗粒聚集,二者结合即可产生黏土聚合物互联网络,而石灰的掺入可促进阳离子键,加速酶-黏土分子的形成,从而提高土体的力学性能及承载力。Excessive addition of lime to improve soft soil will have a certain impact on the ecological environment.In order to avoid environmental pollution in the process of soft soil improvement,laboratory tests were carried out on the Kuda Highway project in Gombe State,it is analyzed the effect and mechanism of improving soft soil roadbed by the combined action of biological enzyme and lime,and draws the following conclusion:The strength of soil can be improved effectively by the solidification of soft soil with biological enzyme,and the solidification of lime can be promoted by biological enzyme with the comparison that of lime only,and the CBR strength could be increased by up to 4%under the combined action of biological enzyme and lime,the strength of kaolin was enhanced by the Hardener,and the maximum stress was 5236kpa,which was 2.87 times higher than that of the enzyme-cured soil.The combination of the two can form a clay polymer network,while the addition of lime can promote the formation of cationic bonds and accelerate the formation of enzyme-clay molecules,therefore,the mechanical properties and bearing capacity of soil are improved.

关 键 词：软土路基 路基改良 加州承载比 试验 

分 类 号：U416.1[交通运输工程—道路与铁道工程]