微生物固化纤维加筋黄土影响因素试验研究  

Experimental Study on Influencing Factors of Microbial Solidified Fiber Reinforced Loess

作　　者：胡其志 霍伟严 马强 陶高梁 HU Qizhi;HUO Weiyan;MA Qiang;TAO Gaoliang(School of Civil Engin.,Architecture and Environment,Hubei Univ.of Tech.,Wuhan 430068,China;Hubei Provincial Bridge Safety Monitoring Tech.and Equipment Tech.Engin.Center,Wuhan 430068,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068 [2]湖北省桥梁安全监控技术与装备技术工程中心,湖北武汉430068

出　　处：《湖北工业大学学报》2025年第1期87-92,共6页Journal of Hubei University of Technology

基　　金：国家自然科学基金(52478338)。

摘　　要：微生物诱导碳酸钙沉淀技术是近年来土体加固的热门研究领域,但其单独用于加固细粒土时效果往往不佳。对黄土开展纤维加筋与微生物固化相结合,探究不同微生物固化养护时间与养护温度下加筋黄土的强度与水稳定性规律。通过三轴剪切试验、崩解试验、BET测试分析了养护时间(7 d、14 d、28 d)与养护温度(5℃、15℃、35℃)对微生物固化纤维加筋黄土固化效果的影响。研究结果表明:1)随着微生物固化养护时间的增加,试样的抗剪强度与水稳定性均有所提高,但养护后期试样抗剪强度增幅不明显,水稳定性有小幅度降低;2)较高的养护温度对于微生物固化具有积极作用,试样的抗剪强度与水稳定性随温度的升高而增大;3)微生物固化作用主要表现为在代谢过程中生成碳酸钙沉淀,与加筋纤维共同作用使得土体孔隙减少,增大试样的比表面积。Microbial induced calcium carbonate precipitation technology is a popular research field in recent years,but it is often not effective when used alone to reinforce fine grained soil.The fiber reinforcement and microbial curing were combined to explore the strength and water stability of the reinforced loess under different microbial curing time and curing temperature.The effects of curing time(7 d,14 d,28 d)and curing temperature(5℃,15℃,35℃)on curing effect of microbial solidified fiber-reinforced loess were analyzed by triaxial shear test,disintegration test and BET test.The results showed that:1)With the increase of microbial curing time,the shear strength and water stability of the samples were improved,but the increase of shear strength was not obvious in the late curing period,and the water stability decreased slightly;2)Higher curing temperature has a positive effect on microbial curing,and the shear strength and water stability of the sample increase with the increase of temperature;3)The solidification of microorganisms is mainly manifested as the formation of calcium carbonate precipitates in the metabolic process,and the interaction with the reinforced fiber reduces the porosity of the soil and increases the specific surface area of the sample.

关 键 词：黄土 微生物 玄武岩纤维 三轴试验 崩解试验 

分 类 号：TU444[建筑科学—岩土工程]