脲酶诱导碳酸钙沉淀对盐渍土冻胀特性的影响  

Influence of Urease-Induced Calcium Carbonate Precipitation on Frost Heave Characteristics of Saline Soil

作　　者：李崛 温自丽 刘正楠 LI Jue;WEN Zili;LIU Zhengnan(College of Traffic&Transportation,Chongqing Jiaotong University,Chongqing 400074,China;School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Hunan Communications Research Institute Co.,Ltd.,Changsha,Hunan 410015,China)

机构地区：[1]重庆交通大学交通运输学院,重庆市400074 [2]重庆交通大学土木工程学院,重庆市400074 [3]湖南省交通科学研究院有限公司,湖南长沙410015

出　　处：《中外公路》2025年第1期53-59,共7页Journal of China & Foreign Highway

基　　金：国家自然科学基金资助项目(编号:52208426);重庆市自然科学基金资助项目(编号:CSTB2024NSCQ-MSX1177)。

摘　　要：针对盐渍土路基冻胀病害问题,该文研究了大豆脲酶诱导碳酸钙沉淀(SICP)技术对盐渍土冻胀特性的影响,重点探讨了压实度、含水率、反应液体积比和养护温度与改良土冻胀率之间的关系。结果表明:采用SICP技术后,土样的冻胀率显著降低,降幅超过28%,且在较高压实度和较低含水率条件下,改良效果尤为明显。此外,增大反应液体积比有助于提高反应效率,而较低的养护温度则是维持脲酶活性的关键因素,两者共同促进了碳酸钙沉淀的生成,从而有效改善了盐渍土的抗冻胀能力。由敏感性分析可知,含水率和反应液体积比对盐渍土冻胀率的影响显著,而压实度和养护温度对其的影响则相对较小。综上所述,SICP技术是一种有效的盐渍土冻胀改良方法,为寒旱区路基工程建设提供了新思路。This study investigated the impact of the soybean urease-induced calcium carbonate precipitation(SICP)technique on frost heave characteristics of saline soil,specifically addressing the frost heave in saline soil used as a subgrade.The relationships between compaction degree,moisture content,volume ratio of the reaction liquid,and curing temperature with the frost heave rate of treated soil were explored.The results show that SICP significantly reduces the frost heave rate of soil samples by over 28%,with the most noticeable improvement occurring under conditions of higher compaction degree and lower moisture content.Additionally,the increased volume ratio of reaction liquid enhances reaction efficiency,while lower curing temperatures are crucial for maintaining urease activity,both of which contribute to the precipitation of calcium carbonate and thereby improve the resistance of saline soil to frost heave.Sensitivity analysis indicates that moisture content and volume ratio of reaction liquid have a significant impact on the frost heave rate of saline soil,while compaction degree and curing temperature exert lesser effects.In conclusion,the SICP technique has been proven to be effective for mitigating frost heave in saline soil,providing insights for subgrade engineering in cold and arid regions.

关 键 词：路基工程 盐渍土 冻胀特性 大豆脲酶 敏感性分析 

分 类 号：U416.1[交通运输工程—道路与铁道工程]