摘要
为探究养护温度对微生物诱导碳酸钙沉淀（Microbially induced carbonate precipitation, MICP）技术改良伊犁黄土力学性能的影响，开展了无侧限抗压强度试验，分析了25℃、30℃及35℃三种温度下MICP处理试样的强度变化规律。结果表明：MICP处理能显著提升土体强度，但加固效果受温度影响显著。在25℃条件下，试样峰值强度为60 kPa，较未处理试样提高了16.13%；当温度升至30℃时，峰值强度达到81.68 kPa，增幅为58.06%；而在35℃下，峰值强度为67.50 kPa，增幅降至30.64%。可见，适度升温（如30℃）有助于增强MICP的胶结效果，但温度过高（如35℃）可能抑制微生物活性或沉淀效率，导致加固效果下降。因此，在实际工程中应重视温度影响，在高温环境下需考虑控温、调节菌液活性或结合其他工艺，以保障MICP技术的处理效果与工程可靠性，为其环境适应性优化提供依据。
关键词： 伊犁黄土；微生物诱导碳酸钙沉淀；养护温度；无侧限抗压强度
Abstract
To investigate the effect of curing temperature on the mechanical properties of Yili loess improved by Microbially Induced Carbonate Precipitation (MICP) technology, unconfined compressive strength tests were conducted. The strength variation patterns of MICP-treated specimens were analysed at temperatures of 25°C, 30°C, and 35°C. Results indicate that MICP treatment significantly enhances soil strength, yet the consolidation effect is markedly influenced by temperature. At 25°C, the peak strength reached 60 kPa, representing a 16.13% increase over untreated specimens. When the temperature rose to 30°C, peak strength reached 81.68 kPa, with an increase of 58.06%. However, at 35°C, peak strength was 67.50 kPa, with the increase rate decreasing to 30.64%. Evidently, moderate temperature elevation (e.g., 30°C) enhances MICP's cementation effect, whereas excessively high temperatures (e.g., 35°C) may inhibit microbial activity or precipitation efficiency, diminishing reinforcement efficacy. Consequently, practical engineering applications must prioritise temperature considerations. In high-temperature environments, measures such as temperature control, adjustment of bacterial suspension activity, or integration with complementary processes should be implemented to safeguard MICP treatment outcomes and structural reliability, thereby providing a basis for optimising its environmental adaptability.
Key words： Ili loess; Microbially induced carbonate precipitation; Curing temperature; Unconfined compressive strength
参考文献 References
[1] Jefferson I, Evstatiev D,Karastanev D. The treatment of collapsible loess soils using cement materials[C]// Proceedings of the GeoCongress 2008. New Orleans: American Society of Civil Engineers, 2008.
[2] 曹利, 卞海丁, 张哲, 等. 高能级强夯黄土地基振动衰减规律模型试验研究[J]. 科学技术与工程, 023, 23(15): 6581-6590.
[3] 钟秀梅, 王谦, 刘钊钊, 等. 干湿循环作用下粉煤灰改良黄土路基的动强度试验研究[J]. 岩土工程学报, 2020, 42(增刊1): 95-99.
[4] 黄趁趁, 杜强, 曲立强, 等. 钙源及固化方式对MICP处理砂黄土均匀性及强度的影响[J/OL]. 土木与环境工程学报(中英文), 1-10, 2025-02-20.
[5] CHU J, IVANOV V, STABNIKOV V, et al.Microbial method for construction of an aquaculture pondin sand [J]. Géotechnique, 2013, 63(10): 871-875.
[6] LIU S Y, YU J, ZENG W L, et al. Repair effect oftabia cracks with microbially induced carbonateprecipitation [J]. Chinese Journal of Rock Mechanics and Engineering, 2020, 39(1): 191-204.
[7] LIU H L, XIAO P, XIAO Y, et al. State-of-the-art review of biogeotechnology and its engineering applications[J]. Journal of Civil and Environmental Engineering, 2019, 41(1): 1-14.
[8] WANG Z Y, ZHANG N, JIN Y, et al. Application of microbially induced calcium carbonate precipitation (MICP) in sand embankments for scouring/erosion control[J]. Marine Georesources & Geotechnology, 2021, 39(12): 1459-1471.
[9] Fischer S Galiant JK,Ban SS. Microbiological precipitation of CaCO3[J]. Soil Biology and Biochemistry, 1999. 31(11). 1563-1571.
[10] QABANY A. AL, SOGA K. Effect of chemical treatment used in MICP on engineering properties of cemented soils[J]. Géotechnique, 2013, 63(4): 331-339.
[11] 彭建兵, 林鸿州, 王启耀, 等. 2014. 黄土地质灾害研究中的关键问题与创新思路[J]. 工程地质学报, 22 （4): 684-691.
[12] Peng J B, Sun P, Igwe O, et al. 2018. Loess caves, a special kind of geohazard on loess plateau,northwestern China[J]. Engineering Geology, 236: 79-88.
[13] 曹小红, 孟和, 尚彦军, 等. 2020. 伊犁谷地黄土滑坡发育分布规律及成因[J]. 新疆地质, 38(3): 405-411.
[14] 王茜. 冻融循环作用下MICP技术处理黄土的力学性能研究[J]. 水利规划与设计, 2025, (08):92-97.
[15] 曹佩娴, 马骉, 司伟, 等. 基于MICP技术的巴氏芽孢杆菌固化黄土效果研究[C]//中国公路学会, 中国航海学会, 中国铁道学会, 中国航空学会, 中国汽车工程学会. 2025世界交通运输大会(WTC2025)论文集（下册）. 长安大学公路学院, 2025:347-353.
[16] 赵天宇, 安亮, 谌文武, 等. 微生物诱导碳酸钙沉淀加固黄土影响因素试验研究[J]. 科学技术与工程, 2025, 5(04): 1620-1627.
[17] Liu J, Zhu Z, He J, et al. Experimental study on shear strength and creep properties of loess modified by microbially induced calcium carbonate precipitation (MICP) under freeze-thaw cycles[J]. Case Studies in Construction Materials, 2025, 22: e04119.
[18] 周昌, 黄顺. 新疆伊犁黄土工程地质特征及致灾机理研究综述[J]. 工程地质学报, 2023, 31(04): 1247-1260.
[19] 中华人民共和国行业标准编写组. 土工试验方法标准:GB/T50123-2019[S]. 北京: 中国计划出版社， 2019.
[20] Wang Z, Zhang N, Cai G, et al. Review of ground improvement using microbial induced carbonate precipitation (MICP)[J]. Marine Georesources & Geotechnology, 2017, 35(8): 1135-1146.
[21] Henze J, Randall D. Microbial induced calcium carbonate precipitation at elevated pH values (>11) using Sporosarcina pasteurii[J]. Journal of Environmental Chemical Engineering, 2018, 6: 5008–5013.
[22] 吴泽炬. 冻融和干湿循环作用对MICP技术改良分散性土效果的影响研究[D]. 吉林大学, 2024.
[23] 王曦. 微生物诱导碳酸钙沉淀技术（MICP）改良分散性土的试验研究[D]. 吉林大学, 2023.
[24] 苏承东, 张振华. 大理岩三轴压缩的塑性变形与能量特征分析[J]. 岩石力学与工程学报, 2008, (02): 273-280.
[25] 岳建伟, 张宝玺, 赵丽敏, 等. 改良微生物诱导碳酸钙沉淀技术加固粉性土力学性能[J]. 科学技术与工程, 2021, 21(18): 7702-7710.
[26] 许晓亮, 陈奕恺, 谭德林, 等. 生物聚合物改良花岗岩残积土的力学特性及机理[J/OL]. 土木与环境工程学报(中英文), 1-10[2025-05-20].
[27] 祝富豪. 钢渣高pH环境下巴氏芽孢杆菌驯化及固化风积沙试验研究[D]. 新疆农业大学, 2023.